Specification
A CONTACT PLATE FIXING STRUCTURE
FIELD OF THE INVENTION
The present invention relates to a contact plate fixing structure, and belongs to
low-voltage electrical technology field.
BACKGROUND
A contactor is an automated control electric appliance, which causes the contacts to be
closed, by means of the magnetic field generated through the current flowing through
the coil, so as to control the load. The contactor usually consists of electromagnetism
system, contact system, arc extinction system, insulated housing, and other
attachments, and so on, and the contact system includes fixed contact assembly and
moving contacts, the moving contacts are usually arranged to link with an armature of
the electromagnetism system, when the coil of the electromagnetisin system is
energized, the armature is able to drive the moving contacts to couple with the
corresponding fixed contact assembly, so as to switch on load power. A fixed contact
assembly usually consists of a contact plate and a fixed contact, and the fixed contact
is fixed on the contact plate, and the contact plate is fixed on the insulated housing of
the contactor, so as to fix the entire fixed contact assembly on the insulated housing to
couple the moving contact, the contact plate is used to support and fix the fixed
contact of the contactor, thei·efore it is required that the contact plate will not be
displaced even when a pressnre is applied thereon.
At present, the contact plate is fixed on the housing by means of pressnre assembling,
as shown in Fig.36, after the contact plate 2 is inserted in the first slot of the housing I,
the contact plate 2 and the housing I are positioned in Y direction through
interference fit at C shown in the fignre, are accnrately positioned in X direction ( the
insertion direction of the contact plate 2) at A in the fignre (the top end in insertion
direction of first slot is arranged to abut against the contact plate at A) and is
compressed tightly by a support component 3 at B shown in the fignre. The contact
plate fixing structure in prior arts comprises a housing I, a contact plate 2, and a
support component 3, because it is required to mount a plurality of contact plates 2
arranged on housing I, every contact plate needs to be positioned by a support
component 3, and the support components 3 is independently arranged at an
appropriate position on the housing I, therefore the contact plate fixing structure in
Specification
prior arts has a complex structure, which may cause a high production cost, and low
economic benefits.
There is another type of contact plate fixing structure, as shown in Fig.37, after the
contact plate 2 is insetted into the first slot of the housing I, the contact plate 2 and
the housing 1 are accurately positioned in X direction at A in the figure, in addition, as
shown in the figure, this structure in prior mt does not apply a suppmt component 3 to
perform the resilient compression, but prevents the contact plate 2 from getting
loosened in the direction opposite to X direction ( the direction opposite to contact
plate insettion direction ) tlu·ough interference fit in Y direction at C in the figure.
Although the contact plate fixing structure has no suppmt component 3, which
decreases production costs, the contact plate 2 will be crept at the position of
interference fit in Y direction after being used for a long time, and as a .result, the
contact plate 2 will be loosened in Y direction, and because the contact plate 2 is not
positioned in X direction, the displacement for the contact plate 2 in the X direction
will be easy to occur, so that the fixed contacts and the moving contacts cannot be
well coupled with each other, and this may cause a huge problem with the quality of
the products in the use.
In summary, there is a teclmical problem of how to provide a contact plate fixing
structure with a simple structure, for which no loosing will occur in the direction
opposite to the insettion direction after long time use.
SUMMARY OF THE INVENTION
One objective of this invention is to solve the teclmical problem of the contact plate
fixing structure that loosing will occur in the direction opposite to the insertion
direction, so as to provide a contact plate fixing structure with a simple stmcture, for
which no loosing will occur in the direction opposite to the insettion direction after
long time use.
To achieve the objective, this invention provides a technic proposal as follows: a
contact plate fixing stmcture, comprising a contact plate, and a housing, having a first
slot formed therein, which is adapted for preventing the contact plate fi·om further
insertion after the contact plate is inserted to a certain position in the first slot; the
Specification
contact plate has a boss formed thereon, and the housing has a resilient clamping slot
formed at a position corresponding to the boss, which allows the boss to be inserted
therein; and when the contact plate is inserted to the certain position and restricted
from fhrther insertion by the first slot, the resilient clamping slot and the boss form a
back-off locking structure, which prevents the contact plate from moving in a reverse
direction of the insertion of the contact plate.
While being inserted into the resilient clamping slot, the boss is adapted for extruding
the resilient clamping slot 2 and causing the resilient clamping slot to be continuously
deformed; when the contact plate is inserted to the certain position in the first slot and
restricted from fmther insertion by the first slot, the boss and the deformed resilient
clamping slot form the back-offlocking structure.
The back-off locking structure comprises a first locking part formed in the resilient
clamping slot, and a second locking part formed on the boss, which is adapted for
coordinating with the first locking part.
The resilient clamping slot comprises two resilient arms formed on the housing and
extending in the insettion direction ofthe contact plate, and a passage formed between
inner side walls of the resilient arms.
The passage comprises a first part and a second part connected with the first part, the
first part has a cross section area reducing gradually in the insertion direction of the
contact plate and the second part has a constant cross section area, and the second part
is positioned at a proximal end of the passage in the insertion direction of the contact
plate.
The first locking part comprises two contact ends respectively formed on the inner
side walls of the resilient arms and arranged at distal ends of the resilient arms in the
insertion direction of the contact plate; the second locking part comprises two first
contact edges, extending in the reverse direction of insertion of the contact plate and
inclined with respect to the inner side walls, and the contact ends are adapted for
respectively abutting against corresponding first contact edges.
Specification
A direction of a force applied to the contact edges by the contact ends and the
insertion direction of the contact plate form an angle (a) not larger than 40 degree, so
as to allow the contact ends and the 'first contact edges to form a self-locking structure.
The first contact edges are straight bevel edges. The first contact edges are arc-shaped
edges. The arc-shaped edges are circular arc-shaped edges.
The contact ends are right -angle ends, or inverted fillets, or in vetted bevel edges.
While being inserted into the resilient clamping slot, the boss is adapted for extruding
the resilient clamping slot 2 and causing the resilient clamping slot to be continuously
deformed; when the contact plate is insetted to the certain position in the first slot and
restricted from further insertion by the first slot, the boss and the resilient clamping
slot completely recovered from_ deformation form the back-offlocking structure.
The back -off locking stmcture comprises a first locking part formed in resilient
clamping slot, and a second locking part formed on the boss, which is adapted for
coordinating with the first locking part.
The resilient clamping slot comprises two resilient arms formed on the housing and
extending in the insertion direction of the contact plate, and a passage formed between
inner side walls of the resilient arms.
The passage comprises a first part and a second part connected with the first part, the
first part has a cross section area reducing gradually in the insertion direction of the
contact plate, the second part has a constant cross section area and is positioned at· a
proximal end of the passage in the insettion direction of the contact plate.
The first locking part comprises two second contact edges respectively formed at
distal ends of the resilient arms in the insertion direction of contact plate; the second
locking patt comprises two second contact edges, formed at its back end defined in
terms of the insertion direction of the contact plate and adapted for forming a lap joint
with corresponding first contact edges, a direction of a supporting force applied by the
second contact edges to the first contact edges is parallel with the insertimi direction
of the contact plate.
Specification
The second contact edges and the first contact edges are flat and straight edges.
The second locking part on the boss has a guide pmt formed at its front end defined in
terms of the insettion direction of the contact plate, and the guide part is adapted for
guiding the insertion of the boss into the passage.
The guide part has a cross section area gradually reducing in the insertion direction of
the contact plate.
The guide part comprises two guide edges extending in the insertion direction of the
contact plate and inclined with respect to the inner side walls.
The guide edges are straight bevel edges, or arc-shaped edges.
The cross section of the boss is in the shape of pentagon or quadrangle.
The cross section of the boss is round shaped.
The cross section of the boss is in the shape of triangle.
The boss is formed at a face of the contact plate.
The boss is formed with separated parts.j
The first slot has a fit stmcture extending perpendicular to the insertion direction of
the contact plate and adapted for being fixed in two directions perpendicular to the
insettion direction of the contact plate.
The fit stmcture comprises an interference fit stmcture for fixing the. contact plate in a
direction perpendicular to both upper and lower faces of the contact plate.
The interference fit structure comprises a projection formed on the contact plate, and a
slot wall adapted for clamping on the projection after the contact plate is inserted into
the first slot.
Specification
The projection is arc-shaped.
The fit structure further comprises a clearance fit structure, adapted for fixing the
contact plate in a direction parallel with the face of the contact plate and perpendicular
to the insertion direction of the contact plate.
The certain position is a distal position m the slot, to which the contact plate is
inserted in the inset1ion direction.
Compared with prior art, the technic proposal of the invention has advantage of that:
1. In the present invention, a boss is formed on the contact plate, and a resilient
clamping is formed on the house, which allows the boss to be inserted therein, so that
when contact plate is being assembled, the first slot prevents the contact plate from
finther insertion after the contact plate is inserted to a certain position. The resilient
clamping slot and the boss form a back-off locking structure which can realize a
stable fixation and may work with the first slot to fix the fixation of the contact plate
in insettion direction and the reverse direction of insettion thereof, the situation that
the contact plate is loosened in insertion direction and reverse direction of insertion
due to interference fit after long time use is avoided. The forming of the back-off
locking structure does not need new parts, or increase the production cost.
2. In the present invention, while being insetted into the resilient clamping slot, the
boss is adapted for extruding the resilient clamping slot and causing the resilient
clamping slot to be continuously deformed; when the contact plate is inserted to the
certain position in the first slot and restricted from further insertion by the first slot,
the boss and the deformed resilient clamping slot form the back -off locking structure,
the resilient clamping slot fixes the contact plate comprising the boss by means of
resilient recover force of the umecovered resilient clamping slot which is
continuously deformed by the boss extmding during the insertion process. the resilient
arms fixes the boss and the contact plate by the resilient recover force applied on the
boss. The back-off locking structure has a simple structure, and may realize a stable
fixation, so as to avoid of the risk that the contact plate is loosened in the reverse
direction of insettion.
Specification
3. In the present invention, the resilient clamping slot comprises two resilient arms
formed on the housing and extending in the insmiion direction of the contact plate,
and a passage formed between inner side walls of the resilient arms, the passage
comprises a first part and a second part cmmected with the first part, the first pati has
a cross section area reducing gradually in the insertion direction of the contact plate
and the second pati has a constant cross section area, and the second pati is positioned
at a proximal end of the passage in the insertion direction of the contact plate, the boss
is inse1ied into the first part with a cross section area reducing gradually in the
insertion direction, and extrude the im1er walls at two sides of the resilient arms to
resiliently deform, and then is inserted into the second part with constant cross section
area, the resilient deformation of the resilient arms remain unchanged, after the widest
part of the boss passes through the proximal end of the second part, the resilience of
the resilient arms starts to recover, and at a certain position during the resilience
recover process the resilient arms and the boss form back -off locking structure, during
this process, the second part of the passage play a role of transition.
4.In the present invention, the first locking part comprises two contact ends
respectively formed on the inner side walls of the resilient arms and arranged at distal
ends of the resilient arms in the insertion direction of the contact plate; the second
locking pati comprises two first contact edges, extending in the reverse direction of
insertion of the contact plate and inclined with respect to the inner side walls, and the
contact ends are adapted for respectively abutting against corresponding first
contact edges. The arrangement of the contact ends and the first contact edges allows
the pushing force of the contact ends applied on the first contact edge to be in the
direction of insertion of the contact plate, so that the pushing force of the contact ends
applied on the first contact edges and the resistance force applied on the contact plate
by the slot respectively fix the contact plate in the insertion direction and in the
reverse direction of insertion thereof; in addition, the normal direction of the position
where the contact ends and the first contact edges contact with each other and the
reverse direction of insertion of contact plate form an angle not larger than the
self-locking angle, in other words, the contact of contact ends and first contact edges
is a self-locking contact, the above-mentioned arrangement ensures that the boss of
the contact plate and resilient arms will not shake in operation.
Specification
5. In the present invention, the second locking part on the boss has a guide patt
formed at its front end defined in terms of the insettion direction of the contact plate,
and the guide part is adapted for guiding the insertion of the boss into the passage, the
guide part has a cross section area gradually reducing in the insertion direction of the
contact plate, the guide part comprises two guide edges extending in the insertion
direction of the contact plate and inclined with respect to the inner side walls. The
straight and beveling edges of the guide part and the straight and .beveling edges of
the resilient arms together may provide a guiding, so as to ensure a smooth change of
stress between the boss and resilient anus in the assembling process.·
6. In the present invention, the boss is arranged on the board of the contact plate, the
boss has a cross section in the shape of pentagon, quadrangle, or round; the housing is
molded by injection molding, the contact plate with the boss is formed using a simple
continuous stamping die, which is easy to achieve an automatic and mass production.
7. In the present invention, a boss is formed on the contact plate, and a resilient
clamping is formed on the house, which allows the boss to be inserted therein, so that
when contact plate is being assembled, the boss extrudes the resilient clamping slot
and causes the resilient clamping slot to be continuously deformed, when the contact
plate is inserted to the certain position in the first slot and restricted from further
insertion by the first slot, the boss and the resilient clamping slot which does not
restore resilience after deformation form a back-off locking structure, by means of
back -off locking structure, the fixation of contact plate in the reverse direction of
insertion is achieved, the situation that the contact plate is loosened in the reverse
direction of insertion due to interference fit after long time use is avoided, the fixation
of the contact plate in reverse direction of insertion does not need new parts, or
increase the production cost.
8. In the present invention, the boss can be formed with separated parts which can
save material of the boss, especially in mass production so as to further lower the cost
of production.
9. In the present invention, the first slot has a fit structure extending perpendicular to
q
Specification
the inse1tion direction of the contact plate and adapted for being fixed in two
directions perpendicular to the insertion direction of the contact plate, therefor, the
fixation of the contact plate is achieved in two coordinate directions which are
perpendicular to insertion direction, the fit structure together with the resilient atms ·
fixes contact plate in the insertion direction by back-off locking structure, the fixation
of the contact plate in tluee coordinate directions is achieved.
I 0. In the present invention, the fit structure comprises interference fit structure which
reliably fixes the contact plate in a direction perpendicular to the upper and lower
faces.
II. In the present invention, the fit structure further comprises a clearance fit structure,
adapted for fixing the contact plate in a direction parallel with the face of the contact
plate and perpendicular to the insertion direction of the contact plate, the clearance fit
structure is advantageous for the contact plate to be inserted into the first slot, this
arrangement improves the assembly efficiency.
BRffiF DESCRIPTION OF THE DRAWINGS
Fig.! is a schematic diagram of assembling the contact plate and the housing of
embodiment I;
Fig.2 is a side view of assembling of the contact plate and the housing of embodiment
I;
Fig.3 is a schematic diagram of the structure of contact body fixed structure plate of
the invention;
Fig.4 is a schematic diagram of the structure of the contact plate of embodiment I;
Fig.S is a schematic diagram showing the assemble process of the pentagon boss and
the resilient arms of embodiment I;
Fig.6 is a schematic diagram showing the self-locking status of the pentagon boss and
the resilient arms of embodiment I;
Fig. 7 is a schematic diagram showing the resilient extrusion between resilient arms
and pentagon boss of embodiment I;
Fig.8 is a schematic diagram showing the assembly of the pentagon boss and the
resilient arms with right angle end of embodiment I;
Fig.9 is a schematic diagram showing assembly of the pentagon boss and the resilient
ro
Specification
arms with inverted rounded angle of embodiment I;
Fig. I 0 is a schematic diagram showing assembly of the pentagon boss and the
resilient arms with inverted bevel edge of embodiment I;
Fig. II is a schematic diagram showing the assembly of two separate triangle bosses
and the resilient arms with right angle end of embodiment I;
Fig.l2 is a schematic diagram showing the assembly of two separate triangle bosses
and the resilient arms with inverted rounded angle of embodiment I;
Fig.13 is a schematic diagram showing the assembly of two separate triangle bosses
and the resilient arms with inverted beveling edge of embodiment I;
Fig.l4 is a schematic diagram showing the assembly of the quadrilateral bosses and
the resilient arms of embodiment I;
Fig.l5 is a schematic diagram showing the assembly of the quadrilateral bosses and
the resilient arms of embodiment 1;
Fig.16 is a schematic diagram showing the assembly of quadrilateral bosses and the
resilient arms of embodiment 1;
Fig.l7 is a three-dimensional diagram showing the assembly of the contact plate and
the housing of embodiment I;
Fig. IS is a schematic diagram showing the assembly of the contact plate and the
housing of embodiment 2;
Fig.19 is a side view showing the assembly of the contact plate and the housing of
embodiment 2;
Fig. 20 is a schematic diagram showing the assembly process of the rounded boss and
the resilient arm of embodiment 2;
Fig.21 is a schematic diagram showing the rounded boss and the resilient arms with a
right angle end of embodiment 2;
Fig.22 is a schematic diagram showing the assembly of the rounded boss and the
resilient arms with inverted rounded angle f embodiment 2;
Fig.23 is a schematic diagram rounded boss and resilient arms with inverted beveling
edge of embodiment 2;
Fig.24 is a schematic diagram showing the assembly of the two separate semi-circular
bosses and the resilient arms with right angle end of embodiment 2;
Fig.25 is a schematic diagram showing the assembly of the two separate semi-circular
bosses and the resilient arms with inverted rounded angle of embodiment 2;
Fig.26 is a schematic diagram showing the assembly of the two separate semi-circular
II
Specification
bosses and the resilient arms with inverted beveling edges of embodiment 2;
Fig.27 is a schematic diagram showing the assembly of the contact plate and the
housing of embodiment 3;
Fig.28 is a side view showing the assembly of the contact plate and the housing of
embodiment 3;
Fig. 29 is a schematic diagram showing the assembly process of the triangle boss and
the resilient arm of embodiment 3;
Fig.30 is a schematic diagram showing the assembly of the triangle boss and the
resilient arms with a right angle end of embodiment 3;
Fig.31 is a schematic diagram showing the assembly of the triangle boss and the
resilient arms with inverted rounded angle of embodiment 3;
Fig.32 is a schematic diagram showing the assembly of the triangle boss and resilient
arms with invCited beveling edge of embodiment 3;
Fig.33 is a schematic diagram showing the assembly of the two· separate triangle
bosses and the resilient arms with right angle end of embodiment 3;
Fig.34 is a schematic diagram showing the assembly of the two triangle bosses and
the resilient arms with inve1ted rounded angle of embodiment 3;
Fig.35 is a schematic diagram showing the assembly of the two triangle bosses and
the resilient arms with inverted beveling edges of embodiment 3;
Fig.36 is a schematic diagram showing the assembly of the contact plate and housing
in prior art;
Fig.37 is a schematic diagram showing the assembly of the contact plate and the
housing of another embodiment in the prior art.
SPECIFICATION OF REFERENCE NUMERAL
1-housing,ll-resilient arm, Ill-contact end, 112-second contact edge, l2-channel,
12a-first part, 12b-second part, 13-first slot; 2-contact plate, 21-boss, 211-first contact
edge, 22- projection, 213-guide edge.
DETAILED DESCRIPTION
In the following, with reference to the figures, the specific embodiments of the
present invention will be described in detail. It should be understood that the specific
embodiments described herein are only intended to illustrate and explain the present
invention and are not intended to limit the invention.
}2.
Specification
Embodiment 1
As a preferred embodiment of the present invention, as shown in Figl,Fig.2 and Fig
17, the present embodiment provides a contact plate fixing structure, which comprises
a housing and a contact plate 2, as shown in Fig.3, a housing 1, having a first slot 13
formed therein, which is adapted for preventing the contact plate 2 from further
insertion after the contact plate 2 is inserted to a cetiain position in the first slot 13,
accurate fixation of the contact plate is achieved at the certain position of the first slot
13 , so as to ensure that the contact plate is assembled to the required position. Noted
that, in the present embodiment, the certain position is a distal position (i.e. A in Fig.2)
in insertion direction of contact plate 2 of the first slot 13, which the contact plate 2 is
inserted into, but the position of accurate positioning in the present embodiment is not
limited hereto, for example, the contact plate can also be restricted by a limit structure
in first slot 13 from fiuiher insetiion when it have not .been inserted into the position
of the top end of the first slot.
In order to achieve that the contact plate 2 is fixed reliably in insertion direction and
reverse direction of insertion, in the present embodiment, as shown in Fig.l and Fig.4,
the boss 21 is formed on the contact plate 2, as shown in Fig.l and Fig.3, a resilient
clamping slot is formed at a position of the housing 1 corresponding to the boss 21,
which allows the boss 2 I to be inserted, as shown in Fig.l and Fig.2, when the contact
plate 2 is inserted to a certain position in the first slot 13 and restricted from further
insertion by the first slot 13, the resilient clamping slot and the boss 21 form an
back-off locking structure so that the contact plate 2 cmmot move in the reverse
·direction of insertion thereof, the back-off locking structure and the first slot 13 in the
proximal end of insertion direction respectively fix the fi·ont-end of the contact plate 2
in insertion direction and the back-end of the contact plate 2 in insertion direction, so
that the situation that the contact plate 2 is fixed reliably in insertion direction and
reverse direction of the insetiion is achieved, and the situation that the contact plate 2
is loosened in the reverse direction of the insertion after long time use is avoided,
moreover, the back-off locking structure is formed by parts of contact plate 2 and
parts of resilient clamping slot 13, therefore, the forming of the back-off locking
structure does not need new parts in the present embodiment, and production cost is
not be increased.
/"b
Specification
Particularly, in the present embodiment, as shown in Fig.5, while being insetted into
the resilient clamping slot, the boss 21 is adapted for extruding the resilient clamping
slot 2 and causing the resilient clamping slot to be continuously deformed, when the
contact plate 2 is inserted to the certain position in the first slot 13 and restricted Ji'otn
further insertion by the first slot 13, the boss 21 and the deformed resilient clamping
slot whose resilience has not been recovered yet form an back -off locking structure,
so that the fixation of the contact plate 2 in reverse direction of the insettion is
achieved.
Furthermore, in the present embodiment, as shown in Fig.l, Fig.5, Fig.6, Fig.7 and
Fig.8, the back-off locking structure comprises a first locking part formed in the
resilient clamping slot, and a second locking pmt formed on the boss 21, which is
adapted for coordinating with the first locking part.
In the present embodiment, as shown in Fig. I and Fig.3, the resilient clamping slot
comprises two resilient arms 11 formed on the housing 1 and extending in the
insertion direction of the contact plate, and a passage 12 formed between inner side
walls of the resilient arms.
The passage 12 comprises a first part 12a and a second pmt 12b connected with the
first part 12a, the first part has a cross section area reducing gradually in the insertion
direction of the contact plate 2 and the second part has a constant cross section area,
and the second pmt 12b is positioned at a proximal end of the passage in the insettion
direction of the contact plate 12. The boss 21 is inserted into the first part 12a with a
cross section area reducing gradually in insertion direction, and extrudes the inner
walls at two sides of the resilient arms to resiliently deform, and then the boss is
inserted into the second part 12b with a constant cross section area, the resilient
deformation of the resilient arms remain unchanged, after the widest portion of the
boss 21 passes though the proximal end of the second part 12b, the resilience of the
resilient arms starts to recover, and at a certain position during the resilience recover
process, the resilient arms and the boss form forms a back -off locking structure ,
during the resilience recover process, the second part 12b plays a role of transiting
and adjusting the fixing position of contact ends Ill .
)L(
Specification
Further specifically, in present embodiment, as shown in Fig.6 and Fig.7, the first
locking pmt comprises two contact ends 111 respectively formed on the iJmer side
walls of the resilient arms 11 and arranged at distal ends of the resilient arms in the
inse1tion direction of the contact plate; the second locking part comprises two first
contact edges 211, extending in the reverse direction of insertion of the contact plate 2
and inclined with respect to the inner side walls, and the contact ends Ill are adapted
for respectively abutting against corresponding first contact edges 2ll.By the
arrangement of the contact ends Ill and the first contact edges 211 ,contact force
formed by the resilience recovery of the contact ends Ill applied on the second
contact edges 211 bias the insertion direction of contact plate 2, so that the contact
force applied to the contact edges 211 by contact ends Ill, and a blocking force F
,applied to the contact plate 2 by the first slot 13 interact to jointly achieve the
objective of the fixation of the contact plate 2 in insertion direction of the contact
plate 2 and the reverse direction of the insettion. In addition, an angle a formed
between the direction of the contact force N ( i.e. the normal direction of the position
at which the contact end Ill is contacted with the first contact edges ) applied by
contact ends Ill to the first contact edges 211 and the insertion direction (reverse
direction of force F ) of contact plate 2 is not larger than a self-locking angle 8 , the
self-locking angle is 40 degrees, it should be noted that, the self-locking angle 0 is
calculated by the fi·iction coefficients of both the contact plate 2 and the resilient arms
11, and the size of contact force applied to the second contact edges 211, in the
present embodiment, the self-locking angle is, but not limited to 40 degree, the
self-locking angle is changed according to the type of material and the magnitude of
the contact force, the present embodiment emphasize on the fact that the contact of
the contact end Ill and the second contact edges 211 is self-locking by resilience
recovery of the contact end 111, the self-locking structure ensures that the contact
plate 2 will not waver at work process.
As shown in Fig.1 and Fig4-16, the second contact edges 211 of the present
embodiment are straight and bevel edges.
As shown in Fig.! and Fig.3-8, the contact end Ill is right angle end. The structure of
right angle is simple and does not need to be molded separately. But the contact end
;s
Specification
111 of the present embodiment is not limited to right angle, as shown in Fig.9-16, it
also can be inverted rounded angle or inverted beveling edge which need to be
molded separately, but the arrangement of the inverted rounded angle or inverted
beveling edge can reduce fray to second contact edges 211 and contact end 111 and
facilitates extending the service life.
In addition, in the present embodiment, as shown in Fig. I and Fig4-8, the second
locking part on the boss 21 has a guide pmt formed at its front end defined in terms of
the insertion direction of the contact plate, and the guide part is adapted for guiding
the insertion of the boss 21 into the passage 12, the effect of the guide part is to make
the boss 21 insert into the passage 12 more smoothly.
As a preferred embodiment of the guide part, in the present embodiment, the guide
part has a cross section area gradually reducing in the insertion direction of the
contact plate 2. Specifically, the guide part comprises two guide edges 213 extending
in the insettion direction of the contact plate 2 and inclined with respect to the inner
side walls. During the process of assembling, the two straight and bevel edges and the
straight and bevel edges of resilient arms 11 fit mutually, so as to make the change of
stress in process of assembling of contact plate 2 balanced and stable .
The guide edges 213 can be straight and bevel edges, and also can be arc-shaped
edges, in the present embodiment, the guide edges 213 are preferably straight and
bevel edges.
More specifically, in the present embodiment, as shown in Fig.S-8, the cross-section
of the boss 21 is polygon, which is preferably pentagon but not limited to pentagon in
the present embodiment, it also can be hexagon, heptagon, or octagon etc. whose
principle is the same as polygon, therefore, it is not necessary to describe them
respectively.
The boss 21 is formed on the face of the contact plate 2. More specifically, in the
present embodiment, consider that the resilient arms of the housing 1 is limited by
space and can only be formed below the first slot 13, therefore the boss 21 is formed
on the lower face of contact plate 2, but in the following improvement, the resilient
J0
Specification
arms can be formed over the first slot 13 and the boss 21 can be formed on the upper
face of the contact plate 2, this arrangement also falls within protection scope of the
present invention.
In the present embodiment, the boss 21 can be integral structure, as shown in Fig.1-l0,
the boss 21 is formed to integral regular pentagon structure, but it is not limited to
integral structure, as shown in Fig.11-13, the boss 21 also can comprise separate
portions including two portions arranged oppositely and each portion has a triangle
cross section area. Although the separate structures increase the complexity of the
process, but it can save timber.
Besides, in the present embodiment, as shown in Fig.2, the first slot 13 has a fit
structure extending perpendicular to the insertion direction of the contact plate 2 and
adapted for being fixed in two directions perpendicular to the insertion direction of
the contact plate 2.
The fit structure comprises an interference fit structure for fixing the contact plate 2 in
a direction perpendicular to both upper and lower faces of the contact plate 2, as
shown at C in Fig.2. The interference fit structure comprises a projection 22 formed
on the contact plate 2, and. a slot wall adapted for clamping on the projection 22 after
·the contact plate 2 is inserted into the first slot 13. More specifically, as shown in
Fig.4, the projection 22 is arc-shaped.
The fit structure also comprises a clearance fit structure adapted for fixing the contact
plate 2 in a direction parallel with the face of the contact plate 2 and perpendicular to
the insettion direction of the contact plate 2. The fit structure facilitates assembling
contact plate 2.
According to the structure described above, the assembling process of the contact
plate fixing structure of the present embodiment is described below with references to
the figures:
As shown in Fig.S, the assembling of the contact plate 2 has three stages. As shown in
the figure, the boss 21representing the contact plate 2 moves fi·om left to right with
11
Specification
respect to the resilient arms 11 representing the housing 1. At the stage of guiding and
assembling, as shown in Fig.Sa, the cooperation of the inner wall of the resilient arms
of the housing I and the straight and beveling edges plays a fhll role of guiding, and
makes the change of stress in process of assemble balanced and stable; at the stage of
interference fit, as shown in Fig.5b, under extruding effect of the boss 21 of the
contact plate 2, the resilient arms II of the housing 1 is resiliently deformed outward
to the largest degree. At the stage of back-off structure formation, as shown in Fig.5c,
the two highest points at upper face and lower face of the boss 21 of the housing 1
cross the two corner points at inner side in front of the resilient arms II of the housing
1, and then the resilience of the resilient arms in the inner side is recovered, and a
back-off structure is formed.
The contact plate 2 continues to move right until an accurate positioning is achieved
at the position A shown in Fig.2. At this time, because of the processing error, the
possible stay position of the contact plate 2 is between the assembling position of the
contact plate I and II. Corresponding to the assembling position of contact plate I, the
resilient deformation of resilient arms 11 is fully recovered, the work position thereof
is position I in Fig.7. Corresponding to assembling position of contact plate II, the
resilient deformation of top column is partly recovered, the work position thereof is
position II in Fig.7. Suppose that the distance between assembling position I and II is
S, when the accumulation error is not larger than S, the resilient compression and
reliable fixation can be carried out by the present invention.
Embodiment 2
As shown in Fig.l8 and Fig.l9, as a substitutable embodiment of the contact plate
fixing structure of embodiment 1, the present embodiment provides a contact plate
fixing structure a contact plate 2, and a housing 1, having a first slot 13 formed therein,
which is adapted for preventing the contact plate 2 li"om fi.nther insettion after the
contact plate 2 is inserted to a certain position in the first slot 13, at the certain
position of the first slot 13 accurate positioning of contact plate 2 is achieved, so as to
ensure that the contact plate 2 is assembled to the required position. Noted that, in the
present embodiment, the cmtain position is the distal position (i.e. A in Fig.l9) in
insertion direction of contact plate 2 of the first slot 13 that the contact plate 2 insert
to, but the position of accurate positioning in the present embodiment is not limited .
;f
Specification
hereto, for example, the contact plate 2 can also be limited by a limit structure in first
slot 13 and restricted from further insertion when it is inserted to the position of the
distal end of the first slot 13.
In the present embodiment, as shown in Fig.l8 and Fig.l9, the contact plate 2 has a
boss 21 formed thereon, the first contact edge 211 of the boss 21 is arc-shaped edge,
preferably, the arc-shaped edge are circular arc-shaped edge, the housing I has a
resilient clamping slot formed at a position corresponding to the boss 21, which
allows the boss 21 to be inserted therein, when the contact plate 2 is inserted to the
certain position and restricted from further insertion by the first slot 13, the resilient
clamping slot and the circular arc-shaped edge form a back-off locking structure
which prevents the contact plate 2 from moving in a reverse direction of the insertion
of the contact plate 2. By the combination of the accurate positioning of the contact
plate 2 by first slot 13 and the accurate positioning of the contact plate 2 by back-off
locking structure at the distal of the insertion direction of contact plate 2 (A in the
Figure) along the first slot 13, the reliable positioning of the contact plate 2 in
insertion direction and reverse direction of the insertion is achieved, and the situation
that the contact plate 2 is loosened in the reverse direction of the inset1ion after a long
time use is avoided, moreover, the back-off locking structure is formed by the contact
plate 2 and the resilient clamping slot 13, therefore, the forming of the back-off
locking structure does not need new parts in the present embodiment, and production
cost is not be increased, in addition, the cooperation of the arc-shaped edge and the
resilient clamping slot achieves the fixation of the contact plate, and does not form
self-locking so that the structure is convenient for the disassemble of the contact
plate.
Specifically, in the present embodiment, as shown in Fig.20, while being inserted to
the resilient clamping slot, the boss 21 is adapted for extruding the resilient clamping
slot 2, and causing the resilient clamping slot to be continuously deformed, when the
contact plate 2 is inserted to the certain position in the first slot 13 and restricted from
fmther insertion by the first slot 13, the circular arc-shaped edges and the deformed
resilient clamping slot form the back-offlocking structure. The fixation of the boss 21
by the resilient clamping slot mainly make use of the resilient recover force applied
by the resilient clamping slot, by the resilient recover force applied by the resilient
Specification
clamping slot which is deformed and has not been recovered to the boss 21, the boss
and the resilient clamping slot form a back-off locking structure, so as to achieve the
fixation of the contact plate 2 in reverse direction of the insertion of the contact plate
2.
In the present embodiment, as shown in Fig.3 and Fig.18, the resilient clamping slot
comprises two resilient arms formed on the housing and extending in the insertion
direction of the contact plate, and a passage 12 formed between imler side walls of the
!'esilient mms 11.
The passage 12 comprises a first part 12a and a second part 12b c<.nmected with the
first part 12a, the first part has a cross section area reducing gradually in the insertion
direction of the contact plate 2 and the second part 12b has a constant cross section
area, and the second part 12b is positioned art a proximal end of the passage in the
insertion direction of the contact plate 2. The boss 21 is inserted into the first part 12a
with a cross section area reducing gradually in the insertion direction, and extrudes
the inner wall at two sides of the resilient mms 11 to resiliently deform, and then the
boss 21 is inserted into the second part 12b with constant cross section area, the
resilient deformation of the resilient arms II remains unchanged, after the widest part
of the boss 21 passes though the proximal end of the second part 12b, the resilience of
the resilient arms 11 starts to recover, and at a certain position during the resilience
recover process the resilient arms 11 and the boss 21 form a back -off locking structure,
during this process, the second part of the passage play a role of transition.
More specifically, as shown in Fig.20, the back-off locking structure also comprises
two contact ends Ill formed on the inner side wall of the two resilient arms 11 and
arranged at the distal ends of the two resilient arms 11 in the insertion direction of
contact plate 2, the two contact ends Ill are adapted for respectively abutting against
the two circular arc-shaped edges.
In present embodiment, as shown in Fig.20 and Fig.21, the contact end Ill is right
-angle end, but not limited to right-angle end, for example as shown in Fig.22-Fig.26,
the contact end 111 can be inverted round angle, or inverted bevel edges.
2_o
Specification
As shown in Fig.20, the boss 21 has a guide part formed at its fi·ont end defined in
terms of the insertion direction of the contact plate, and the guide part is adapted for
guiding the insertion of the boss 21 into the passage 12. The guide part may provide a
guiding during the process that, the boss 21 is inserted into the passage 12, so as to
make the change of stress in the assembling process balanced and stable.
Particularly, in the present embodiment, the guide part has a cross section area
gradually reducing in the insertion direction of the contact plate 2. The guide part
comprises two guide edges 213 extending in the insertion direction of the contact
plate and inclined with respect to the ilmer side walls. The guide edges are straight
and bevel edges, or arc-shaped edges. In the process of assembling, the straight and
bevel edges, or arc-shaped edges of the guide part and the straight and bevel edges of
the resilient arms cooperate to each other, so as to provide a good guide function, and
to make the stress change between the boss 21 and the resilient arms balanced and
stable.
The guide edges 213 can be straight and bevel edges or arc-shaped edges, in the
present embodiment, the guide edges 213 are preferably arc-shaped edges.
The boss 21 is formed on the face of the contact plate 2. Particularly, in the present
embodiment, consider that the resilient arms II of the housing 1 are limited by space
and can only be formed under the first slot 13, therefore, the boss 21 is formed on a
lower face of the contact plate 2, but if the resilient arms 11 can be formed over the
first slot 13 after following improvement, the boss 21 can be formed on a upper face
of the contact plate 2, tl:Us arrangement also drops within protection scope of the
present invention.
The cross section of the boss 21 is round shaped. As shown in Fig.20-23, the boss 21
is integral rounded boss structure. But the boss 21 is not limited to integral structure,
as shown in Fig.24-26, the boss 21 can also be separate structures which are formed
by two semicircular bosses.
Besides, in the present embodiment, as shown in Fig.l9, the first slot 13 has a fit
stmcture which fixes the contact plate 2 in two directions which are vertical with the
)_(
Specification
inse1iion direction of contact plate 2 and are vertical to each other.
The fit structure comprises interference fit structure which fixes the contact plate 2 in
a direction which is vertical with the upper and lower faces, as shown at C in Fig.19.
The interference fit structure comprises a projection 22 formed on the contact plate 2,
and a slot wall is adapted for clamping on the projection 22 after the contact plate 2 is
inse1ied into the first slot 13. As shown in Fig.l9, the projection 22 is arc-shaped.
As shown in Fig.19, the fit structure also comprises a clearance fit structure adapted
for fixing the contact plate 2 in a direction parallel with the face of the contact plate
and perpendicular to the insertion direction of the contact plate 2. The arrangement of
the clearance fit structure facilitates the assembling of the contact plate 2.
The certain position is a distal position in insertion direction of contact plate 2, in
which the contact plate 2 is inserted to the first slot 13.
According to the above-described structure, the assembling process of the contact
plate fixing structure of the present embodiment is described below with reference to
the drawings:
The assembling of contact plate 2 has three stages, as shown in Fig.20. The boss 21
representing the contact plate 2 moves Ji'mn left to right relative to the resilient arms
representing the housing 1. At the stage of guiding and assembling, as shown in
Fig.20a, the inner side wall of the resilient arms of the housing I and the arc-shaped
edges of the boss 21 of contact plate 2 cooperate with each other, so as to provide a
guiding, and to make the change of stress in assembling process be balanced and
stable; at the stage of interference fit, as shown in Fig.20a, under extruding effect of
the boss 21 of the contact plate 2, the resilient arms 11 of the housing I is resiliently
deformed outward to the largest degree .. At the stage of back-off structure formation,
as shown in Fig.20c, the two highest points of the upper face and lower face of the
boss 21 of the contact plate I cross two corner points at inner side in fi'Ont of the
resilient arms 11 of the housing 1, and then the resilience of the resilient arms 11 in
the hmer side is recovered, and the back-off structure is formed.
Specification
Embodiment 3
As an alternative embodiment of contact plate fixing stmcture of embodiment 1 and
contact plate fixing structure of embodiment 2, the present embodiment provides a
contact plate fixing structure, as shown in Fig.27 and Fig.28, which comprises a
contact plate 2, and a housing 1, having a first slot 13 formed therein, which is
adapted for preventing the contact plate 2 froni further insertion after the contact plate
2 is inserted to a certain position in the first slot 13, the contact plate 2 has a boss 21
fonned thereon, and the housing I has a resilient clamping slot formed at a position
corresponding to the boss 21, which allows the boss 21 to be inserted therein, the boss
21 is adapted for extruding the resilient clamping slot 2 and causing the resilient
clamping slot to be continuously deformed and when the contact plate 2 is inserted to
the certain position and restricted from further insertion by the first slot 13, the
resilient clamping slot and the boss 21 form a back-off locking stmcture, which
prevents the contact plate 2 from moving in a reverse direction of the insertion of the
contact plate 2, by means of the back -off locking structure, the fixation of contact
plate in reverse direction of the insertion is achieved, the situation that the contact
plate is loosened in the reverse direction of inset1ion during its work process is
avoided, the fixation of the contact plate in reverse direction of the insertion does not
need new parts, and production cost is reduced.
Furthermore, in the present embodiment, the back-off locking structure comprises a
first locking patt formed in the resilient clamping slot, and a second first locking part
formed on the boss 21, which is adapted for coordinating with the first locking part.
As shown in Fig 3 and Fig.27, the resilient clamping slot comprises two resilient arms
11 formed ·on the housing 1 and extending in the insertion direction of the contact
plate, and a passage 12 formed betwee.n inner side walls of the resilient arms.
The passage 12 comprises a first part 12a and a second part 12b connected with the
first part 12a, the first part has a cross section area reducing gradually in the insertion
direction of the contact plate 2 and the second part has a constant cross section area,
and the second part 12b is positioned at a proximal end of the passage in the insertion
direction of the contact plate 12. The boss 21 is insetted into the first part 12a with a
cross section area reducing gradually in the insertion direction, and extrudes the inner
))
Specification
wall at two sides of the resilient arms 11 to resiliently deform, and then the boss is
inserted into the second part 12b with constant cross section area, the resilient
deformation of the resilient arms II remains unchanged, after the widest pmt of the
boss 21 passes though the proximal end of the second part 12b, the resilience of the
resilient arms II is fully recovered, and the resilient arms II and the boss 21 form a
back-off locking structure, during this process, the second part of the passage plays a
role of transition.
In the present embodiment, the first locking pmt comprises two second contact edges
112 respectively formed on the resilient arms and arranged at distal ends of the
resilient arms 11 in the insertion direction of the contact plate, the second locking part
comprises two first contact edge 211, formed at its back end defined in terms of the
insertion direction of the contact plate and adapted for forming a lap joint with
corresponding second contact edges 112, a direction of a supporting force applied by
the second contact edges 112 to the first contact edges 211 is parallel with the
insertion direction of the contact plate 2.
More specifically, in the present embodiment, the second contact edges 112 and the
first contact edges 211 are flat and straight edges.
As an alternative embodiment of the second contact edges 112 and the first contact
edges 211, the second contact edges 112 can be inverted bevel edges, the first contact
edges 211 can be corner points on the two sides of the boss 21, as shown in Fig.32
and Fig.35.
In addition, in the present embodiment, the second locking part on the boss 21 has a
guide part formed at its front end defined in terms of the insertion direction of the
contact plate 2, and the guide part is adapted for guiding the insettion of the boss 21
into the passage. By the guiding of the guide part, the boss 21 can be inserted into the
passage 12 mo!'e smoothly.
Specifically, the gnide part comprises two guide edges 213 extending in the insertion
direction of the contact plate and inclined with respect to the itmer side walls.
P"-1
Specification
Fmthermore, the guide edges are straight and bevel edges or arc-shaped edges. In the
present embodiment, the guide edges 213 are straight and bevel edges.
In the present embodiment, the boss 21 is formed at a face of the contact plate 2.
Specifically, consider that the resilient arms of the housing 1 is restricted by space and
only can be formed below the first slot 13, therefore, the boss 21 is formed on the
lower face of the contact plate 2, but in the following improvement, the resilient arms
11 can be formed on the upper face of the contact plate 2, this arrangement also falls
in the protection scope of the present invention.
As shown in Fig.29-31, the cross-section of the boss 21 is in the shape of triangle, the
bottom edge of the triangle is first contact edge 211, the two bevel edges of the
triangle are guide edges 213.
The two embodiments of triangle boss are shown in Fig.30 and Fig.31. In Fig.30, the
distal end of the resilient arms 11 in insertion direction of the contact plate 2 is flat
and straight edge, and the corner points on the inner sides of the resilient arms are
right-angle ends. In Fig.31, the distal end of the resilient arms 11 in insertion direction
of the contact plate 2 is flat and straight edge, the corner points on the inner sides of
the resilient arms are inverted fillets.
As an alternative embodiment of the boss 21, the boss 21 can also be formed with
separated parts. The embodiment that the boss 21 is formed with two separated
triangle parts is shown in Fig.33-Fig.35. In Fig.33, the distal end of the resilient arms
II in insertion direction of the contact plate 2 is flat and straight edge, and the corner
points on the inner sides of the resilient arms are right-angle ends. In Fig.34, the distal
end of the resilient arms 11 in insertion direction of the contact plate 2 is flat and
straight edge, the corner points on the ilmer sides of the resilient arms 11 are inverted
fillets, the bottom edges of the two separated triangle bosses are flat and straight
edges. In Fig.35, the distal end of the resilient arms 11 in inse1tion direction of the
contact plate 2 is flat and straight edge, the inner side corner points of the resilient
arms 11 are inverted bevel edges, the outer side corner points of the two separated
triangle are respectively abutted against the two inverted bevel edges.
)(
Specification
Besides, as shown in Fig.28, in the present embodiment, the first slot 13 has a fit
structure extending perpendicular to the insettion direction of the contact plate 2 and
adapted for being fixed in two directions perpendicular to the insertion direction of .
the contact plate 2.
In the present embodiment, the first slot 13 fixes the contact plate 2 in two coordinate
directions perpendicular to the insertion direction of the contact plate 2, the fit
structure comprises an interference fit structure for fixing the contact plate 2 in a
direction perpendicular to both upper and lower faces of the contact plate 2. The
fixation achieved by the interference fit structure is reliable.
The interference fit structure comprises a projection 22 formed on the contact plate 2,
and a slot wall adapted for clamping on the projection 22 after the contact plate 2 is
inserted into the first slot 13. The interference fit structure formed by the projection
22 clamping on the hmer wall of the first slot 13 is shown at C in Fig.28.
As shown in Fig.28, the projection 22 is arc-shaped.
In the present embodiment, the fit structure further comprises a clearance fit structure
adapted for fixing the contact plate 2 in a direction parallel with the face ofthe contact
plate and perpendicular to the insertion direction of the contact plate. The clearance fit
structure facilitates assembling the contact plate 2.
The certain position is a distal position in the first slot 13, to which the contact plate 2
is insetted in the insertion direction.
According to the above-mentioned structure, the assembling process of the contact
plate fixing structure of the present embodiment is described below with reference to
the figures:
The assembling of the contact plate 2 has three stages, as shown in Fig.29. The boss
21 representing the contact plate 2 moves from left to right with respect to the
resilient arms II representing the housing I. At the stage of guiding and assembling,
as shown in Fig.29a, the cooperation of the inner wall of the resilient arms of the
~6
Specification
housing 1 and the straight and bevel edges of the boss 21 of the contact plate 2 plays a
full role of guiding, and makes change of stress in process of assemble balanced and
stable; at the stage of interference fit, as shown in Fig.29b, under the extruding effect
of the boss 21, the resilient arms 11 of the housing 1 is resiliently deformed outward
to the largest degree. At back-off structure formation stage, as shown in Fig.29c, the
two highest points at upper face and lower face of the boss 21 of the housing 1 cross
the two corner points at inner side in front of the resilient arms 11 of the housing 1,
and then the resilience of resilient arms 11 in the ilmer side is recovered, when the
resilience of the resilient arms 11 is fully recovered, the second contact edge of the
resilient arms and the first contact edges of the boss 21 form a back -off locking
structure.
To be noted, since the contact plate 2 is punched and formed by punching press mold,
the corner points of the shaping boss is generally small round corners.
Obviously, the above-described embodiments are only examples for clear description,
and are not restriction of the mode of enforcement. For ordinary skill men in the field,
other changes can be made in different forms on the basis of the above description.
There is no need to explain all embodiments here. And the apparent changes or
variations still drop the protection scope of the invention.

Claims
1. A contact plate fixing structure, comprising
a contact plate (2), and
a housing (1), having a first slot (13) formed therein, which is adapted for
preventing the contact plate (2) from further insertion after the contact plate (2) is
inserted to a certain position in the first slot (13);
characterized in that the contact plate (2) has a boss (21) formed thereon, and the
housing (1) has a resilient clamping slot formed at a position corresponding to the
boss (21 ), which allows the boss (21) to be inserted therein; and when the contact
plate (2) is inserted to the certain position and restricted from further insertion by
the first slot (13), the resilient clamping slot and the boss (21) form a back-off
locking stmcture, which prevents the contact plate (2) from moving in a reverse
direction of the insertion of the contact plate (2).
2. The contact plate fixing structme according to claim 1, characterized in that while
being inserted into the resilient clamping slot, the boss (21) is adapted for
extmding the resilient clamping slot 2 and causing the resilient clamping slot to
be continuously deformed; when the contact plate is inserted to the certain
position in the first slot and restricted from further insertion by the first slot (13),
the boss (21) and the deformed resilient clamping slot form the back-off locking
structure.
3. The contact plate fixing structure according to claim 2, characterized in that the
back-off locking stmcture comprises a first locking part formed in the resilient
clamping slot, and a second locking part formed on the boss (21), which is
adapted for coordinating with the first locking part.
4. The contact plate fixing structure according to claim 3, characterized in that the
resilient clamping slot comprises two resilient arms (11) formed on the housing (1)
and extending in the insertion direction of the contact plate, and a passage (12)
formed between inner side walls of the resilient arms.
5. The contact plate fixing structure according to claim 4, characterized in that the
passage (12) comprises a first pmt (12a) and a second part (12b) connected with
the first part (12a), the first part has a cross section area reducing gradually in the
Claims
inse1tion direction of the contact plate (2) and the second pmt has a constant cross
section area, and the second pmt (12b) is positioned at a proximal end of the
passage in the inse1tion direction of the contact plate (12).
6. The contact plate fixing structure according to any of claims 3-5, characterized in
that the first locking pmt comprises two contact ends (Ill) respectively formed on
the inner side walls of the resilient arms (II) and arranged at distal ends of the
resilient arms in the insertion direction of the contact plate; the second locking
part comprises two first contact edges (211), extending in the reverse direction of
insertion of the contact plate (2) and inclined with respect to the inner side walls,
and the contact ends (111) are adapted for respectively abutting against
corresponding first contact edges (211) .
7. The contact plate fixing structure according to claim 6, characterized in that a
direction of a force applied to the contact edges by the contact ends and the
insertion . direction of the contact plate form an angle ( a ) not larger than 40
degree, so as to allow the contact ends (Ill) and the first contact edges to form a
self-locking structure.
8. The contact plate fixing structure according to claim 7, characterized in that the
first contact edges (211) are straight bevel edges.
9. The contact plate fixing structure according to claim 7, characterized in that the
first contact edges (211) are arc-shaped edges.
10. The contact plate fixing structure according to claim 9, characterized in that the
arc-shaped edges are circular arc-shaped edges.
11. The contact plate fixing structure according to any of claims 6-10, characterized in
that the contact ends (Ill) are right-angle ends, or inverted fillets, or inverted bevel
edges.
12. The contact plate fixing structure according to claim I, characterized in that while
being inserted into the resilient clamping slot, the boss (21) is adapted for
Claims
extruding the resilient clamping slot 2 and causing the resilient clamping slot to
be continuously deformed; when the contact plate is inserted to the certain
position in the first slot and restricted from further inse1iion by the first slot (13),
the boss (21) and the resilient clamping slot completely recovered from
deformation form the back -off locking structure.
13. The contact plate fixing structure according to claim 12, characterized in that the
back-off locking structure comprises a first locking pmi formed in resilient
clamping slot, and a second locking part formed on the boss (21 ), which is
adapted for coordinating with the first locking part.
14. The contact plate fixing structure according to claim 13, characterized in that the
resilient clamping slot comprises two resilient arms (11) formed on the housing (1)
and extending in the insertion direction of the contact plate, and a passage (12)
formed between ilmer side walls of the resilient arms.
15. The contact plate fixing structure according to claim 14, characterized in that the
passage (12) comprises a first part (12a) and a second part (12b) cmmected with
the first pmi (12a), the first part has a cross section area reducing gradually in the
inse1iion direction of the contact plate (2), the second part has a Constant cross
section area and is positioned at a proximal end of the passage in the insertion
direction of the contact plate (12).
16. The contact plate fixing structure according to any of claims 12~15, characterized
in that the first locking part comprises two second contact edges (112)
respectively formed at distal ends of the resilient arms (11) in the insertion
direction of contact plate; the second locking part comprises two second contact
edges (112), formed at its back end defined in terms of the insertion direction of
the contact plate and adapted for forming a lap joint with corresponding first
contact edges (211 ), a direction of a supporting force applied by the second
contact edges (112) to the first contact edges (211) is parallel with the insertion
direction of the contact plate (2).
17. The contact plate fixing structure according to claim 16, characterized in that the
Claims
second contact edges (112) and the first contact edges (211) are flat and straight
edges.
18. The contact plate fixing structure according to any of claims 4-17, characterized in
that the second locking pmt on the boss (21) has a guide part formed at its fi·ont
end defined in terms of the insertion direction of the contact plate, and the guide
part is adapted for guiding the insertion of the boss(21) into the passage (12).
19. The contact plate fixing structure according to claim 18, characterized in that the
guide part has a cross section area gradually reducing in the insettion direction of
the contact plate (2).
20. The contact plate fixing structure according to claim 19, characterized in that the
guide part comprises two guide edges (213) extending in the insertion direction of
the contact plate and inclined with respect to the inner side walls.
21. The contact plate fixing structure according to claim 20, characterized in that the
guide edges (213) are straight bevel edges, or arc-shaped edges.
22. The contact plate fixing structure according to any of claims 8-21, characterized in
that the cross section of the boss (21) is in the shape of pentagon or quadrangle.
23. The contact plate fixing structure according to any of claims 8-21, characterized in
that the cross section of the boss (21) is round shaped.
24. The contact plate fixing structure according to claims 8-21, characterized in that
the cross section of the boss (21) is in the shape of triangle.
25. The contact plate fixing structure according to any claims l-24, characterized in
that the boss (21) is formed at a face of the contact plate.
26. The contact plate fixing structure according to any of claims 22-24, characterized
in that the boss (21) is formed with separated parts.!
61
Claims
27. The contact plate fixing structure according to any of claims 1-26, characterized in
that the first slot (13) has a fit structure extending perpendicular to the insertion
direction of the contact plate and adapted for being fixed in two directions
perpendicular to the insertion direction of the contact plate.
28. The contact plate fixing structure according to claim 27, characterized in that the
fit structure comprises an interference fit structure for fixing the contact plate in
a direction perpendicular to both upper and lower faces of the contact plate.
29. The contact plate fixing struch1re according to claim 28, characterized in that the
interference fit struch1re comprises a projection (22) formed on the contact plate
(2), and a slot wall adapted for clamping on the projection (22) after the contact
plate (2) is inserted into the first slot (13).
30. The c.ontact plate fixing struch1re according to claim 29, characterized in that the
projection (22) is arc-shaped.
31. The contact plate fixing struch1re according to any of claims 28-30, characterized
in that the fit structure fmiher comprises a clearance fit struchJre, adapted for
fixing the contact plate (2) in a direction parallel with the face of the contact plate
and petpendicular to the insertion direction of the contact plate.
32. The contact plate fixing structure·according to any of claims 28C30, characterized
in that the certain position is a distal.position in the slot, to which the contact plate
(2) is inserted (13) in the insmtion direction.