TECHNICAL FIELD
The present subject matter is related to a push type switch. More 5 particularly, but not exclusively
to a push type switch for low current circuits in vehicles.
BACKGROUND
A switch is a device to open/on and close/off a flow of current in an electrical circuit. Push type
switch is manually operated switch designed to open and close an electrical circuit by depressing
10 and releasing a push button on the switch in the direction of button axis. There are various
configurations of push type switch used for a low current application in a vehicle to make or
break an electrical connection of an engine, light, indicator, air conditioner etc.
For example, U.S. Patent number 20070284238A1, discloses a push switch which includes an
input terminal and an output terminal each protruded outside a case at one end and is disposed in
15 the case at the other end. Between the input terminal and the output terminal is disposed a
switching unit having an input part, an output part, and a signal input part. The input part and the
output part are connected to the input terminal and the output terminal, respectively. Between the
signal input part of the switching unit and the input terminal is disposed a switch contact, which
slides to perform electrical contact and separation in response to the vertical motion of the
20 operating body accommodated in the case.
In view of the above mentioned conventional push switch, the length of the slidable switch
contact is directly proportional to the size of packaging case. Furthermore, the input to output
electrical connections are relatively complex in construction, and consequently relatively
expensive to manufacture. Accordingly, a need exists for a push type switch that addresses one
25 or more above discussed disadvantages and other associated problems with the conventional
push switches, ensuring enhanced manufacturability, operability and reduced cost.
3
SUMMARY
The one or more shortcomings of the prior art are overcome by push type switch as claimed and
additional advantages are provided through the provision of push type switch as claimed in the
present disclosure.
5
In one non-limiting embodiment of the present disclosure a push type switch comprising a
housing, a pusher, a plurality of electrical terminals, a contact strip, and a resilient member. The
housing defining a chamber having an opening therein and the pusher disposed in the chamber
and adapted for movement relative thereto through the opening therein. The plurality of electrical
10 terminals integrally formed within the housing and partially exposed to interior of the chamber.
The contact strip mounted on the pusher, having a plurality of contact points adapted to
individually engage the plurality of electrical terminals to form an electrical connection. The
resilient member is interposed between the pusher and the housing, for urging the pusher away
from the housing. Wherein, the pusher is adapted to releasably lock at a predetermined position
15 relative to the housing upon manual depression of the pusher, such that the contact strip is
selectively engaged with at least two of the electrical terminals effectuating a switching function
thereon, said pusher is adapted to retract back from the predetermined position to an initial
position upon further depression of the pusher.
In an embodiment, the contact strip is removably mounted to the pusher by mounting means such
20 as crush ribs and receiving boss, slot and notch or like.
In an embodiment, the push type switch further comprises a cover removably arranged on the
housing, said cover having an opening defined therethrough to movably receive the pusher. The
push type switch further comprises latching holes and latching protrusions, mating with the
latching hole, being formed on the cover and the housing respectively, for removably securing
25 the cover to the housing.
In an embodiment, a pushbutton knob is integrally formed over the pusher.
In an embodiment, the pusher includes guides for slidably operating the pusher within guide
openings formed in the chamber of housing.
In an embodiment, the number of each of the contact points and the electrical terminals is three.
4
In an embodiment, the contact strip is made comprising a base portion and a bent portion
integrally extending from the base portion, wherein the bent portion forms an acute angle with
the base portion. Such that the base portion is configured for mounting on the pusher and the
bent portion has the plurality of contact points. In another embodiment the base portion has a
resilient notch for mounting the contact 5 strip on the pusher. In another embodiment, the base
portion has a boss for mounting the contact strip on a mating crushing ribs disposed on the
pusher.
In an embodiment, each of the electrical terminals are disposed in a terminal opening defined in
the housing and the terminal opening has internal steps to allow locking and movement of the
10 contact strip for effectuating the switching function.
Additional features and advantages are realized through the techniques of the present disclosure.
Other embodiments and aspects of the disclosure are described in detail herein and are
considered a part of the claimed disclosure.
15 BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The
disclosure itself, however, as well as a preferred mode of use, further objectives and advantages
thereof, will best be understood by reference to the following detailed description of an
20 illustrative embodiment when read in conjunction with the accompanying figures. One or more
embodiments are now described, by way of example only, with reference to the accompanying
figures wherein like reference numerals represent like elements and in which:
Figure 1 illustrates an exploded view of the push switch in accordance with an embodiment of
the present disclosure.
25
Figure 2 illustrates a perspective view of the push switch in accordance with an embodiment of
the present disclosure.
Figure 3 illustrates the top view of the push switch in accordance with an embodiment of the
30 present disclosure.
5
Figure 4 illustrates a bottom perspective view of pusher.
Figure 5 illustrates a cross-sectional view A-A of the push switch in 1st position.
5
Figure 6 illustrates a cross-sectional view B-B of the push switch in 1st position.
Figure 7 illustrates a cross-sectional view C-C of the push switch in 1st position.
10 Figure 8 illustrates a cross-sectional view A-A of the push switch in 2nd position.
Figure 9 illustrates a cross-sectional view B-B of the push switch in 2nd position.
Figure 10 illustrates a cross-sectional view C-C of the push switch in 2nd position.
15
Figure 11 illustrates a cross-sectional view A-A of the push switch in 3rd position.
Figure 12 illustrates a cross-sectional view B-B of the push switch in 3rd position.
20 Figure 13 illustrates a cross-sectional view C-C of the push switch in 3rd position.
Figure 14 illustrates a cross-sectional view D-D at various positions of the pusher.
Figure 15 illustrates a perspective exploded view of the contact strip and pusher in accordance
25 with an embodiment of the present disclosure.
Figure 16 illustrates a perspective sectional view of a push type switch in accordance with an
embodiment.
Figure 17 illustrates a sectional view of a push type switch in accordance with an embodiment.
30
6
Figure 18 illustrates a front view of the pusher with contact strips in accordance with an
embodiment.
Figure 19 illustrates a side view of the pusher with contact strips in accordance with an
5 embodiment.
Figure 20 illustrates a bottom view of the pusher with contact strips in accordance with an
embodiment.
10 Figure 21 illustrates a perspective view of the contact strip in accordance with an embodiment.
Figure 22 illustrates a side view of the contact strip in accordance with an embodiment.
Figure 23 illustrates a bottom view of the contact strip in accordance with an embodiment.
15
Figure 24 illustrates a perspective view of an alternate embodiment of the pusher with contact
strips in accordance with the present disclosure.
Figure 25 illustrates an exploded perspective view of the alternate embodiment of the pusher
20 with contact strips in accordance with the present disclosure.
Figure 26 illustrates a sectional view of the pusher with contact strips in accordance with the
present disclosure.
25 The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in
the art will readily recognize from the following description that alternative embodiments of the
structures and methods illustrated herein may be employed without departing from the principles
of the disclosure described herein.
DETAILED DESCRIPTION
30
7
In the present document, the word "exemplary" is used herein to mean "serving as an example,
instance, or illustration." Any embodiment or implementation of the present subject matter
described herein as "exemplary" is not necessarily to be construed as preferred or advantageous
over other embodiments.
5
While the disclosure is susceptible to various modifications and alternative forms, specific
embodiment thereof has been shown by way of example in the drawings and will be described in
detail below. It should be understood, however that it is not intended to limit the disclosure to the
forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and
10 alternative falling within the spirit and the scope of the disclosure.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a
non-exclusive inclusion, such that a setup, device or method that comprises a list of components
or steps does not include only those components or steps but may include other components or
15 steps not expressly listed or inherent to such setup or device or method. In other words, one or
more elements in a system or apparatus proceeded by “comprises… a” does not, without more
constraints, preclude the existence of other elements or additional elements in the system or
apparatus.
20 In the following detailed description of the embodiments of the disclosure, reference is made to
the accompanying drawings that form a part hereof, and in which are shown by way of
illustration specific embodiments in which the disclosure may be practiced. These embodiments
are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it
is to be understood that other embodiments may be utilized and that changes may be made
25 without departing from the scope of the present disclosure. The following description is,
therefore, not to be taken in a limiting sense.
As shown in Figure 1 to Figure 14, a push type switch 100 (interchangeably referred to switch)
is disclosed in accordance of an embodiment of present disclosure. The switch 100 comprises a
30 housing 10, a pusher 20, a plurality of electrical terminals 30, a contact strip 40, and a resilient
member 50.
8
The housing 10 may be a hollow rectangular box with an open top surface such that the housing
defining a chamber having an opening therein. The housing 10, encompasses a plurality of
electrical terminals 30 within a wall such that the terminals extend vertically downwards. For
example, three electrical terminals 31, 32, 33 are utilized as electrical terminals 30. The electrical
terminals 31, 32, 33 are preferably made of a conducting 5 material such as metal conduct and
distribute low current electricity. The electrical terminals 31, 32, 33 are partially exposed
towards interior chamber of the housing 10 through terminal openings 11 present on the housing
10.
The pusher 20 acts as an operational shaft in the switch 100. The pusher 20 is disposed in the
10 chamber of the housing 10. The pusher includes guides 21 for slidably operating the pusher 20
within guide openings 12 formed in the chamber of housing 10. To accommodate the contact
strip 40, a rectangular slit 22 is provided on one side of the pusher 20. An undercut 23 is
provided on the front surface of pusher 20 below the rectangular slit 22. The pusher 20 also has a
tapered face 24 extending upwardly from the bottom of the pusher 20. The tapered face 24 is
15 provided on the rectangular slit 22. A rectangular step 25 is provided on the upper most portion
of the rectangular slit 22. The pusher 20 includes a cavity 26 extending upwardly from the
bottom surface of the pusher 20 to accommodate the resilient member 50.
In an embodiment, a pushbutton knob 70 is integrally formed over the pusher 20.
The contact strip 40 is a press worked electrically-conductive sheet metal. The contact strip 30 is
20 mounted on the pusher 20, having a plurality of contact points 41, 42, 43 adapted to individually
engage the plurality of electrical terminals 31, 32, 33 to form an electrical connection. The
contact strip is made comprises a base portion 44 and a bent portion integrally extending from
the base portion 44, wherein the bent portion forms an acute angle with the base portion. The
base portion 44 is configured for mounting on the pusher 20 and the bent portion has the
25 plurality of contact points 41, 42, 43. In an embodiment, the base portion 44 has a resilient notch
45 for mounting the contact strip 40 on the pusher 20.
The resilient member 50 is used to urge the pusher 20 away from the housing 10. The resilient
member 50 may be a compression spring made of a coiled metal wire such that the lower end is
disposed over a spring guiding protrusion 13 provided in the bottom surface of the chamber in
9
the housing 10. In assembled condition of the switch 100, the terminal openings 11 allow the
electrical terminals 31, 32, 33 to get in contact with the three contact points 41, 42, 43 of the
contact strip 30, respectively. The terminal openings 11 are designed in such a way that various
positions of the pusher 20 can selectively engage a predetermined pair of electrical terminals 31,
32, 33 to get in contact with corresponding pair 5 of contact points 41, 42, 43 enabling flow of
current and effectuating a switching function thereon. The terminal openings 11 includes a
plurality of internal steps as shown in the figures to allow locking and movement of the contact
strip 40 for effectuating the switching function. The internal steps within the terminal openings
11 releasably lock the pusher 20 various position relative to the housing 10 upon manual
10 depression of the pusher 20.
In an embodiment, the switch 100 further comprises a cover 60 removably arranged on the
housing 10. The cover 60 forms an upper covering of the switch 100 to restrict entry of foreign
particles into internal portions of the switch 100. The cover 10 forms a hollow box configuration
with an open bottom portion. The cover 10 includes an opening 61 as a provision to allow
15 reciprocal movement of the pusher 20 through the opening 61. In an embodiment, the cover 60
includes latching holes 62 mate-able with the latching protrusions 14 being formed the housing
10 for removably securing the cover 60 to the housing 10.
The housing 10 may include a stopper 15 extending outwardly from outer surface of the housing
10. The spring guiding protrusion 13 is vertically disposed on the inner bottom surface of the
20 housing 10. The spring guiding protrusion 13 may be of truncated cone shape. The cover 60, the
pusher 20 and the housing 50 may be made of any known material.
The switch 100 is assembled as following. Firstly, the base 44 is slid into the undercut 23 by
sliding the notch 45 along the tapered face 24 up to which the notch 45 gets snap locked inside
the rectangular step 25. As the base 44 is enclosed by internal faces of the undercut 23 the
25 contact strip 40 is secured to the pusher 20. The notch 45 doesn’t allow the contact strip 40 to
retrace back in way the contact strip 40 is inserted, preventing the contact strip 40 from being
detached from the pusher 20. The resilient member 50, i.e. a compression spring is inserted into
the cylindrical cavity 26. Further the pusher 20 is inserted inside the housing 10 such that bottom
end of the resilient member 50 resides over the spring guiding protrusion 13. Finally, the cover
10
60 is fixed over the pusher 20 and the housing 10 by mating the latching holes 62 with the
latching protrusions 14. A preloading contact force is achieved by pre-determined compression
of the contact strip 40 during the initial insertion of the contact strip 40 in to the housing 10.
In an embodiment of the present disclosure, as shown in Figure 15, which depicts an
embodiment of fixing the contact strip 40 with the pusher 20. 5 The pusher 20 may comprise of a
plus shaped slit 27 provided on one side of the pusher 20. At the center of the plus shaped slit
27, a plurality of crushing ribs 28 are provided. The base 44 includes a circular boss 46 made by
cutting and raising a region of the base 44. To affix the contact strip 40 to the pusher 20, the
circular boss 46 of the contact strip 40 is press fitted and matted against the crushing ribs 28 such
10 that the plus shaped slit 27 encompasses and confines the contact strip 40 to the pusher 20 with
the help of crushing ribs 28.
The working of the switch 100 is described as following. When a force is applied manually on
the pushbutton knob 70 by a user, the pusher 20 gets depressed from a switch off position to a
normal switch on condition. The pusher 20 gets locked in the switch on condition due to the
15 various steps on the opening 11. To switch off the circuit the user must apply a force on the
pushbutton knob 70 to depress the pusher 20 downwardly to full stroke switch on condition.
Further, on removal of force by the user the pusher 20 retracts back to initial switch off position
due to the urging upward action of the resilient member 50. Figure 5 to Figure 13, clearly show
various sections of switch 100 at different switching conditions.
20 The full stroke ramp switch on condition is the lowest position that may be achieved by the
pusher 20 and is considered as 3rd position of the pusher 20. The normal switch on condition is
considered as 2nd position of the pusher. Whereas, the switch off position is considered as 1st
position. The 1st position is the upper most position achieved by the pusher 20.
Figure 14 shows various positions of the pusher. In the switch off condition, the contact points
25 42, 43 are connected to terminals 32,33 respectively and contact point 41 is not connected to any
terminal. In the full stroke ramp and normal switch on condition, the contact points 41, 42 are
connected to terminals 31, 32 respectively and contact point 43 is not connected to any terminal.
Furthermore, if the switch 100 is utilized as an air conditioning switch of an HVAC (heating,
ventilation and air conditioning) control panel, terminal 31 is connected to the air conditioner
11
signal, terminal 32 is grounded and terminal 33 is not connected. If the switch 100 is utilized as a
mode switch of the HVAC control panel, terminal 31 is connected to the air recirculation signal,
terminal 32 is grounded and terminal 33 is connected to fresh air recirculation signal. If the
switch 100 is utilized as a defog switch of the HVAC control panel, terminal 31 is connected to
the defog signal, terminal 32 is grounded 5 and terminal 33 is not connected to any source.
Figures 16-23 illustrate another embodiment of the present disclosure. In this embodiment, the
push type switch 300 has two contact strips 310 located at either side of the pusher 320 are used.
Use of two contact strips 310 with two set of electrical terminals 330 disposed in the housing 340
has various advantages. For example, the contact strips 310 when installed in the housing 340
10 along with the pusher 320 are preloaded with a force for biasing the contact points of the contact
strips 310 towards the electrical terminals 330. Figure 18 illustrates and example of condition of
the contact strips 310’ before placement in the housing and condition of the contact strips 310
after placement in the housing. The inner two contact strips 310 as illustrated show condition of
contact strip after placement in the housing, and the laterally outer two contact strips 310’
15 illustrate the condition of the contact strip before placing the pusher 320 along with the contact
strip in the housing. As illustrated, due to being of the contact strips, the contact strips exert force
on the pusher at one side and on the electrical terminals on the other side. Placement of two
contact strips 310 opposite to each other on either side of the pusher 320 balances out or cancel
the biasing force acting on the pusher 320. Accordingly, the movement of pusher can be now
20 achieved smoothly with reduction in wear and tear over long term of use. Therefore, the overall
life of the push type switch 300 is greatly enhanced. The housing 340 and the pusher 320 are
provided with necessary modifications for mounting of the two contact strips 310 along with two
set of electrical terminals 330. The two set of electrical terminals 330 may be identical to each
other.
25 Figure 17 illustrates a cross section of the push type switch 300 showing the preloaded contact
strips. Further, the resilient notches 312 are shown resting in the rectangular steps 314 of the
pusher acting as stopping faces for a snap lock engagement for retaining the contact strip on the
pusher after the contact strip is slide fitted in the pusher during assembly.
12
The contact strip is formed by sheet metals and has a bend formed between the contact points
and the base portion. The angle of bend of the contact strip in an embodiment is better illustrated
in the embodiment is illustrated in Figure 22. As shown, the angle A of bend of the contact strip
may be between 50 degrees to 70 degrees. Further, the thickness of the sheet of metal that forms
the contact strip may be 0.08mm to 0.15 mm. The contact 5 strip may be made of any suitable
material that is electrically conductive and has resiliency to be able to retain its shape under
stress over long term.
Further, as shown in Figure 21, the contact strip is provided with two fitment holes 350 for
facilitating installation of the contact strip 310 on the pusher. The two holes may be used for
10 pulling the contact strip 310 in predetermined position to engage the rectangular step of pusher
with the resilient notch.
Referring to Figure 22 and 23, the contact strip may be made of the sheet of metal with thickness
0.08 mm to 0.15 mm for compensating the bending stress developed to generate the
predetermined contact pressure between moving contact strip arms and fixed terminals. The gap
15 between two contact points may be kept 0.6 to 0.8 mm whereas the width of the contact point
may be 1.2 to 1.6 mm. Accordingly, the ration between the width of the contact points versus the
gap between the contact points may be kept as approximately 2:1.
Further, range for the gap between 1st and 2nd contact point of the contact strip is 0.6-0.8 mm
which is half of the width of any arm ranging from 1.2 to 1.6 mm. in order to achieve minimum
20 possible width ‘A’ of the contact strip, for being manufacturable in production tooling. This is
the most compact structure of the part achieved during deliberations by the inventors.
Figures 24-26 illustrate yet another embodiment 400 of the present disclosure. In figures 24-26,
the two contact strips 410 are made integral to each other for ease of manufacturing and
assembly. As illustrated, the two contact strips are made of a single metal sheet 420 stamped and
25 bent to required shape and size. This contact strip may be insert moulded into the pusher 430.
This arrangement allows for economic and easy manufacturing as well as assembly. The metal
sheet 420 is also provided with a pocket 440 at its central portion of allowing insertion of molded
plastic for firmly retaining the contact strips 410 in the pusher and restricting any relative motion
13
between the contact strips 410 and the pusher 430. The lower faces 450 of the pusher 430 are
flattened so that the side cores in the tools can be operable to release the undercut 460.
Accordingly, the advantages of this embodiment are that the contact strip is firmly held in the
pusher, so there is no relative motion between the pusher and contact strip during operation of
the push type switch. Further, having contact 5 strip moulded into the pusher saves on assembly
time required for fitting of contact strip on the pusher. As well as there is reduction in number of
parts as the two contact strips are formed by a single sheet of metal. Also, comparatively this
embodiment is cost effective to manufacture.
It is to be understood by a person of ordinary skill in the art would design push type switch in
10 any shape, dimension and configuration to push type switch without deviating from the scope of
the present disclosure. Also, various modifications and variations may be made without
departing from the scope of the present invention. Therefore, it is intended that the present
disclosure covers such modifications and variations provided they come within the ambit of the
appended claims and their equivalents.
15
Equivalents:
With respect to the use of substantially any plural and/or singular terms herein, those having skill
in the art can translate from the plural to the singular and/or from the singular to the plural as is
20 appropriate to the context and/or application. The various singular/plural permutations may be
expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in
the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms
(e.g., the term “including” should be interpreted as “including but not limited to,” the term
25 “having” should be interpreted as “having at least,” the term “includes” should be interpreted as
“includes but is not limited to,” etc.). It will be further understood by those within the art that if a
specific number of an introduced claim recitation is intended, such an intent will be explicitly
recited in the claim, and in the absence of such recitation no such intent is present. For example,
as an aid to understanding, the following appended claims may contain usage of the introductory
30 phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such
14
phrases should not be construed to imply that the introduction of a claim recitation by the
indefinite articles “a” or “an” limits any particular claim containing such introduced claim
recitation to inventions containing only one such recitation, even when the same claim includes
the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or
“an” (e.g., “a” and/or “an” should typically be interpreted 5 to mean “at least one” or “one or
more”); the same holds true for the use of definite articles used to introduce claim recitations.
In addition, even if a specific number of an introduced claim recitation is explicitly recited, those
skilled in the art will recognize that such recitation should typically be interpreted to mean at
least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers,
10 typically means at least two recitations, or two or more recitations). Furthermore, in those
instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general
such a construction is intended in the sense one having skill in the art would understand the
convention (e.g., “a system having at least one of A, B, and C” would include but not be limited
to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C
15 together, and/or A, B, and C together, etc.). In those instances where a convention analogous to
“at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense
one having skill in the art would understand the convention (e.g., “a system having at least one of
A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A
and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be
20 further understood by those within the art that virtually any disjunctive word and/or phrase
presenting two or more alternative terms, whether in the description, claims, or drawings, should
be understood to contemplate the possibilities of including one of the terms, either of the terms,
or both terms. For example, the phrase “A or B” will be understood to include the possibilities of
“A” or “B” or “A and B.”
25 While various aspects and embodiments have been disclosed herein, other aspects and
embodiments will be apparent to those skilled in the art. The various aspects and embodiments
disclosed herein are for purposes of illustration and are not intended to be limiting, with the true
scope and spirit being indicated by the following claims.
30
15
We claim:
1. A push type switch comprising:
a housing defining a chamber having an opening therein;
a pusher, disposed in the chamber and 5 adapted for movement relative thereto
through the opening therein;
a plurality of electrical terminals disposed in the housing and partially exposed to
interior of the chamber;
at least one contact strip mounted on the pusher, having a plurality of contact
10 points adapted to engage the plurality of electrical terminals to form an electrical
connection; and
a resilient member interposed between the pusher and the housing, for urging the
pusher away from the housing;
wherein, the pusher is adapted to releasably lock at a predetermined position relative to
15 the housing upon manual depression of the pusher, such that the contact strip is
selectively engaged with at least two of the electrical terminals effectuating a switching
function thereon, said pusher is adapted to retract back from the predetermined position
to an initial position upon further depression of the pusher.
20 2. The push type switch as claimed in claim 1, wherein the contact strip is removably
mounted to the pusher by mounting means such as crush ribs and receiving boss, slot and
notch or like.
3. The push type switch as claimed in claim 1, further comprises a cover removably
25 arranged on the housing, said cover having an opening defined therethrough to movably
receive the pusher.
4. The push type switch as claimed in claim 1 and claim 3, further comprises latching holes
and latching protrusions, mating with the latching hole, being formed on the cover and
30 the housing respectively, for removably securing the cover to the housing.
16
5. The push type switch as claimed in claim 1, wherein a pushbutton knob is integrally
formed over the pusher.
6. The push type switch as claimed in claim 1, wherein the pusher includes guides for
slidably operating the pusher w 5 ithin guide openings formed in the chamber of housing.
7. The push type switch as claimed in claim 1, wherein the number of each of the contact
points and the electrical terminals is three.
10 8. The push type switch as claimed in claim 1, wherein the contact strip is made comprises:
a base portion; and
a bent portion integrally extending from the base portion, wherein the bent portion
forms an acute angle with the base portion;
wherein the base portion is configured for mounting on the pusher and the bent portion
15 has the plurality of contact points.
9. The push type switch as claimed in claim 8, wherein the base portion has a resilient notch
for mounting the contact strip on the pusher.
20 10. The push type switch as claimed in claim 8, wherein the base portion has a boss for
mounting the contact strip on a mating crushing ribs disposed on the pusher.
11. The push type switch as claimed in claim 1, wherein each of the electrical terminals are
disposed in a terminal opening defined in the housing and the terminal opening has
25 internal steps to allow locking and movement of the contact strip for effectuating the
switching function.
12. The push type switch as claimed in claim 1, wherein the number of contact strips is two.
30 13. The push type switch as claimed in claim 1, wherein the contact strip is insert moulded in
the pusher.
17
14. The push type switch as claimed in claim 12, wherein the two contact strips are made
integral to each other.
15. The push type switch as claimed in claim 7, wherein 5 the width of the contact points is in
range of 1.2-1.6 mm and the gap between two adjacent contact points is between 0.6-0.8
mm.