Field of Invention:
The present invention relates to a regulating device of an automobile. Particularly, the present
invention relates to an electromechanically operated window regulator which regulates windows
up and down.
Background of the Invention:
The electromechanical operated window regulator is widely being used in an automobile to
regulate the door window for it’s up and down function. For this product, many of the
automobile users face variety of complaints like either not working of window regulator or
erratic working of the same. One of the major problem associated with existing window
regulator, as shown in figure 17, is that it was not withstanding higher running current up to 18 A
and higher lock current up to 28 A. In order to find out the problems associated with existing
regulators, few problematic regulators had been thoroughly analyzed and found the one of the
root cause of failure of window regulator. This was found as burning of the fixed and moving
contacts. The reasons of contact burning were as follows;
 One of the main reasons was slower contact breaking speed, not quicker return and more
friction makes speed slower due to butt type contact design. Referring figure 17, moving
contact is actuated by regulator knob to make or break contact by compression spring.
There exists a friction between pusher and moving contact. This friction increases when
dust and other foreign particle sticks between pusher and moving contact. This increased
friction slows contact returning speed resulting in contact burning and regulator not
working. Therefore there was a need a mechanism wherein moving contact return is
quicker and independent of compression spring force.
 Another reason was the orientation or design of the contacts. Due to horizontal contact
design, dust or foreign particle accumulated. Referring figure 17, fixed and moving
contact layout is parallel to road surface. Therefore dust and foreign particle will be
accumulated over the said contacts due to gravitational forces. These said particles mixed
with grease between fixed and moving contact and slows contact returning speed
resulting in contact burning and regulator not working.
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 One more important reason found as the workability of the elements in mechanism. Such
as a single spring responsible for contact force as well as operational force. Once again
referring figure 17, there is single spring loaded pusher which makes contact by applying
the force and allows to return back the moving contact to its normal condition. Over a
period of time friction occurs among operating knob, compression spring and moving
contact. This friction leads to material wear and tear resulting in loss of contact force
between fixed and moving contact and resulting in slower contact returning speed and
further resulting in contact burning and regulator not working.
 Another reason found as existing contact material with poor properties like lower thermal
stability, lower resistance to micro welding and more contact erosion under high current
of operation. The said poor properties results in burning of contact consequently failure
of the regulator.
 Referring figure 17, the existing regulators require an application of grease between fixed
and moving contact in order to reduce friction between the contacting surfaces during
toggling to switch position. The said grease travels from moving contact to contact
making areas of fixed and moving contacts resulting in carbonization of contacts
resulting in contact burning and hence failure of the regulator.
 One more reason found as less contact separation distance between the fixed and moving
contact result in arcing/chattering between the contacts. This produced arcing results in
burning of contact which ultimately leads to failure of the regulator.
Object of the present invention:
The main object of the present invention is to overcome at least one of the above problems.
Another object of the present invention is to provide a regulating device for an automobile.
Still another object of the present invention is to provide an electromechanical regulating device
for an automobile which regulates windows of automobile up and down.
Summary:
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The present invention relates to provide an electro-mechanical window regulator for an
automobile. The said electro-mechanical window regulator comprises a housing and a cover. The
said housing comprises a pair of moving contact strips assembly, a pair of fixed contacts
mounted on at least a positive terminal insert molded in cover at predetermined locations. The
said moving contact strip assembly comprises a moving contact strip of predetermined length
and cross-section having holes on both ends i.e. first end and second end A moving contact is
riveted at the said first end said moving contact strip assembly and the said second end is being
secured in window up or down terminal insert molded in the housing via rivet mounting. Both
the said moving contact strip assemblies are mounted parallelly but having secured ends
mounted diagonally. At least a pair of pusher is disposed in the housing at predetermined
locations. The said housing is provided with at least a pair of cavity to accommodate the pair of
pusher. The said pushers are mounted in such a way that one end of the said pusher rest on
moving contact strip at predetermined locations and the other end of pusher disposed under the
wedge portion of the pusher. A slider is placed at first end of the housing and connected with the
knob by means of a connecting link. The said slider is provided with a pair of wedge portion on
its bottom side facing the said housing. As the user operates the knob, the said wedge pair
actuates the said pushers in order to apply force on the respective said moving contact strip
assembly. Consequently, the said moving contact strip assembly makes contact with the
respective said fixed contacts disposed in the cover locked with at least a pair of snaps provided
at the second end of the housing.
Brief description of drawings of the present invention:
Further aspects and advantages of the present invention will be readily understood from the
following detailed description with reference to the accompanying figures.
The figures together with a detailed description below, are incorporated in and form part of
the specification, and serve to further illustrate the embodiments and explain various
principles and advantages, in accordance with the present invention wherein:
Figure 1 illustrates perspective view of an electromechanical window regulator according to an
embodiment of the present invention.
5
Figure 2 shows exploded view of an electromechanical window regulator according to an
embodiment of the present invention.
Figure 3 illustrates front view of an electromechanical window regulator according to an
embodiment of the present invention wherein sectioning is depicted.
Figure 4 illustrates vertical sectional view as section A-A of an electromechanical window
regulator according to an embodiment of the present invention wherein moving contact strip
assembly makes contact at ground terminal in no switching condition.
Figure 5 illustrates vertical sectional view as section A-A of an electromechanical window
regulator according to an embodiment of the present invention wherein moving contact strip
assembly makes contact at positive terminal in window down switching condition.
Figure 6, illustrates vertical sectional view as section B-B of an electromechanical window
regulator according to an embodiment of the present invention wherein moving contact strip
assembly makes contact at positive terminal in window up switching condition.
Figure 7, illustrates vertical sectional view as section B-B of an electromechanical window
regulator depicting location of secondary stoppers provided on the housing and slider according
to an embodiment of the present invention.
Figures 8, illustrate front view of an electromechanical window regulator when slider has been
hidden to depict pushers position and figure 9a and 9b represents back view and isometric view
when cover sub assembly has been hidden to depict moving contact strip assembly position,
where the pair of moving contact strip assembly making contact at the pair of ground terminal
and the pair of moving contact strip assembly making contact at window up and down terminal
according to an embodiment of the present invention.
Figure 10, illustrates insert molding of output terminal cover with cover body as well as
mounting of fixed contacts or terminal are being depicted in the perspective view of cover sub
assembly of the electromechanical window regulator according to an embodiment of the present
invention.
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Figure 11, illustrates insert molding of housing terminal with housing is being depicted in the
perspective view of housing sub assembly of the electromechanical window regulator according
to an embodiment of the present invention.
Figures 12 and 15, illustrates moving contact strip assembly of the electromechanical window
regulator according to an embodiment of the present invention.
Figure 13, shows a vertical sectional view as section C-C of the electromechanical window
regulator depicts the assembling of cover sub assembly and housing sub assembly according to
an embodiment of the present invention.
Figure 14 illustrates top view of an electromechanical window regulator module manual
regulating mode to depict led position for knob symbol illumination according to an embodiment
of the present invention.
Figure 16, illustrates a perspective view of bottom side of the slider according to an embodiment
of the present invention.
Figure 17 shows vertical sectional view of prior art representing details of existing mechanism.
Description of the present invention:
While the invention is susceptible to various modifications and alternative forms, specific
embodiment thereof has been shown by way of example in the figures and will be
described in detail below. It should be understood, however that it is not intended to limit the
invention to the particular forms disclosed, but on the contrary, the invention is to cover all
modifications, equivalents, and alternative falling within the spirit and the scope of the invention
as defined by the appended claims.
Before describing in detail embodiments it may be observed that the novelty and
inventive step that are in accordance with the present invention resides in electromechanical
window regulator. It is to be noted that a person skilled in the art can be motivated from the
present invention and modify the various constructions of assembly. However, such
modification should be construed within the scope and spirit of the invention.
Accordingly, the drawings are showing only those specific details that are pertinent to
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understanding the embodiments of the present invention so as not to obscure the disclosure
with details that will be readily apparent to those of ordinary skill in the art having benefit
of the description herein.
The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a
non-exclusive inclusion, such that a setup, electromechanical window regulator that comprises a
list of components does not include only those components but may include other components
not expressly listed or inherent to such setup or electromechanical window regulator. In other
words, one or more elements in a system or electromechanical window regulator proceeded by
“comprises… a” does not, without more constraints, preclude the existence of other elements or
additional elements in the electromechanical window regulator. The following paragraphs
explain present invention wherein an electromechanical window regulator (as shown in figure 2).
The invention in respect of the same may be deduced accordingly.
Accordingly, the present invention provides an electromechanical window regulator for an
automobile comprising a knob (1) pivotaly, a housing (100) comprising a first end (101) and a
second end (102) opposite to the first end (101), a cover (300) for covering the second end (102)
of housing (100), a pair of fixed contact disposed on to at least a positive terminal (302’) insert
molded in the said cover (300), at least a ground terminal (104) and a window up terminal (103)
and a window down terminal (103’) insert molded with the said housing (100), a pair of moving
contact strip assembly (400) disposed in the said housing (100) having their first end (408)
secured at predetermined position in window up and window down terminal insert molded in the
said housing and second ends (409) free able to move which are consisting a pair of moving
contact (402) so as to make contact with the said respective ground terminal (104) and the said
respective fixed contact, a pair of pushers (105) disposed in the guides (105’) provided in the
housing at predetermined location, a slider (200) disposed in the first end (101) of the housing
and connected to the knob (1) by means a of connecting link (2) so that pivotal movement of the
knob results in sliding movement of the slider, the slider (200) comprising a pair of wedge
portion (203) disposed on bottom surface of the slider which faces the said housing and located
at predetermined locations so as to actuate the pushers (104) thereby actuating the respective
moving contact assembly (400) thereby making or breaking contacts with the respective fixed
contacts for regulating window up or down.
8
In one aspect of the present invention, the pair of said fixed contact, is firmly riveted in a pair of
through holes provided in the predetermined location of the said positive terminal (302’).
In another aspect of the present invention, the said ground terminal (104) disposed in the housing
is insert molded with housing act as ground terminal or negative terminal.
In still another aspect of the present invention, the window up terminal (103) and the window
down terminal (103’) are insert molded with the said housing, comprises a through hole provided
at the predetermined location so as to accommodate the first ends of moving contact strip
assemblies in order to secure the moving contact strip assemblies.
In yet another aspect of the present invention, the moving contact strip assembly comprises a
moving contact strip of predetermined length and cross-section having a through hole on both
ends of the moving contact strip, the hole (412) provided on second end of moving contact strip
assembly is provided to accommodate the moving contact (402) which makes or breaks contact
at ground and positive terminal.
In another aspect of the present invention, the moving contact is provided with curved surface
(403) on one side and flat surface (403’) on the other side opposite to curved surface.
In still another aspect of the present invention, the said moving contact strip is provided with one
or more rounded curve profiles (410, 411) at predetermined location(s) being bent by
predetermined angle(s).
In yet another aspect of the present invention, the said moving contact strip is provided with a
curvature profile (412) at predetermined location where the stress is being
developed/experienced high.
9
In another aspect of the present invention, the pair of moving contact strip assembly is mounted
in housing in such a way that the first ends of both moving contact strips are diagonally secured
by a pair of rivet mounting or securing means or fixing means at predetermined locations.
In still another aspect of the present invention, the knob is pivotally mounted on a regulator body
wherein the regulator body (3) encompasses the said housing which is connected to the knob via
connecting link (2).
In yet another aspect of the present invention, during the operation of said regulator and upon
actuating the slider via knob of the said regulator, only one of the moving contact strip is being
actuated in order to make contact with the respective said fixed contact in the said positive
terminal provided in said cover while the other remain in contact with the respective said ground
terminal (104) in the said housing.
In another aspect of the present invention, the pair of the said moving contact strip assembly
remains in contact with a pair of the said ground terminals of the regulator during no operation
condition of the said regulator.
In still another aspect of the present invention, the said slider (200) is provided with one or more
stopper faces and slot at predetermined location and one or more stopper rib in the said housing.
In yet another aspect of the present invention, the said regulator is able to withstand high running
current, preferably up to 18A, as well as high lock current, preferably up to 28A.
The present invention provides an electromechanical window regulator an automobile. Referring
to figure 1-16, which show various parts of the electromechanical window regulator of the
present invention and views thereof, it can be observed that the same comprises:
Knob – 1;
Connecting link – 2;
Regulator body – 3 (not shown in figure);
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Housing – 100;
First end of housing – 101;
Second end of housing – 102;
Window up terminal – 103;
Window down terminal – 103’;
Ground terminal – 104;
Pusher – 105;
Guiding slot in the housing for accommodating the pusher – 105’;
Guiding Slot for cover sub assembly fitment – 107;
LED – 110;
Slider – 200;
Stopper provided with slider – 201;
Stopper surface provided on the slider – 202, 202’;
Wedge portion – 203;
Cover – 300;
Fixed contact – 302;
Positive terminal – 302’;
Guiding Rib – 303;
Moving contact strip assembly – 400;
Moving contact strip – 401;
Moving contact – 402;
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Curved surface of moving contact – 403;
Flat surface of moving contact – 403’;
Mounting rivet – 404;
Free end portion – 405;
Middle portion – 406;
Fixed end portion – 407;
Rounded curve or joining surface between the fixed end portion and middle portion – 410;
Rounded curve or joining surface between the free end portion and middle portion – 411;
Curvature profile provided in free end portion – 412;
Hole provided on second end of moving contact strip to accommodate moving contact – 413;
Hole provided on first end of moving contact strip to accommodate mounting rivet – 413;
High stress zone at rounded curves (410 and 411) – HS- 1;
High stress zone at curvature profile (412) – HS- 2;
Pointed higher stress curvature profile (412) – Phs;
Window up direction – Wu;
Window down direction – Wd;
Zone where no possibility of grease floating to contact areas – Ng;
No grease application between pusher and moving contact strip – Ng’;
Grease application area – Ga;
Locking of housing with cover sub assembly – L.
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Accordingly the present invention provides an electromechanical window regulator, the said
electromechanical window regulator comprises of a knob and regulator body. The knob is
pivotably mounted on the regulator body as shown in figure 3 (the regulator body is not shown in
figure 3). Referring figure 2, said electromechanical window regulator comprises a housing
encompasses by said regulator body, a cover, a pair of moving contact strip, a pair of fixed
contact, a pair of moving contact, a least a positive terminal, a least a ground terminal, a window
up terminal, a window down terminal, a pair of pushers and a slider.
The housing in thermoplastic and insulating material is provided with at least two open ends i.e.
first end and second end. The slider in thermoplastic material is disposed on the first end of the
housing. The said slider is slidably mounted on the said housing. The said slider is being
connected with the knob in thermoplastic material with the help of a connecting link of said knob
as shown in figure 3. The said slider is provided with a pair of wedge portion at predetermined
location on its bottom surface facing the housing. The top surface of the said slider is provided
with a pair of rib at predetermined location. The said connecting link is securely placed in the
said pair of ribs. The cover in thermoplastic and insulating material is provided for said housing
to close the second end of the said housing. The said cover is snap fitted in locking slots
provided in the said housing as shown in figure 11.
The pair of moving contact strip assembly being mounted in the housing. The said pair
comprises two moving contact strip in non ferrous and conductive metal i.e. first and second
moving contact strip assembly. The said moving contact strip assembly comprises a said moving
contact strip, having holes on its first and second end and a moving contact in non ferrous and
conductive metal is mounted in the hole provided on the second end as shown in figures 12 and
15. The said pair of moving contact strip assembly is being secured in the housing by securing or
fixing their first ends with help of fixing means as mounting rivet shown in figure 9a and 9b. The
fixing means can be fixing rivet in non ferrous and conductive metal or alike suitable means for
fixing which are known to a person skill in the art. The said two moving contact strip assembly
are mounted in such a way that their secured ends are diagonally located as shown in figures 9a
and 9b and 11 according to an embodiment of the present invention. In other words, if the first
moving contact strip is secured at the left end of the first end of the housing then second moving
contact strip is to be secured at the right end of the first end of the housing or vice-versa. In such
13
a manner both the moving contact strip assemblies are mounted parallelly and spaced apart. The
actuation of said moving contact strip assembly is parallel to road surface or horizontal in order
to avoid dust and foreign particles accumulation. The mounting of the same on printed circuit
board (not shown in drawings) is in such a way that inclination and actuation of both of moving
contact strip sub assembly is normal to PCB and also the said inclination is normal to road
surface. Therefore, foreign body or particles will tend to fall downward with effect of
gravitational force and will not be accumulated on contact making areas.
The said moving contact strip made up of a material having self-resilient properties. Referring to
figure 15, the said moving contact strip is provided with a predetermined length and crosssection
having three portion i.e. fixing end portion, middle portion and free end portion. The
fixing end portion and free end portion are provided on the extreme ends. In other words, the
fixing end portion includes the first end of the moving contact strip while the free end portion
includes second end of the moving contact strip. The middle portion joins the said extreme end
portions i.e. fixing end portion and free end portion in such a manner that the fixing end portion
and free end portion becomes non-linear or non-coplanar as shown in figures 12 and 15. The
joining portion of fixing end portion and middle portion forms an outwardly rounded curve ‘f’.
Similarly, the joining portion of free end portion and middle portion forms an inwardly rounded
curve ‘e’. In this way, if the fixing end portion is secured in the housing, due to the elevation
provided by the middle portion, the free end portion is able to move upwardly or downwardly.
The free end portion is provided with inwardly curvature profile at predetermined location as
shown in figures 12 and 15.
Referring figure 10, 11 and 12 the said moving contact is being riveted on the second end of the
moving strip. The said moving contact has two contact surfaces i.e. top and bottom. The said top
face is flat surface while the bottom face is curved surface. The said window regulator of the
present invention comprises a pair of fixed contact, a pair of moving contact, at least a ground
terminal, at least a positive terminal, a window up terminal and a window down terminal. These
said contacts and terminals are made of non ferrous and conductive metal to flow electric current
and posses excellent electrical, mechanical & thermal properties. The negatively charged
terminals have been called as the ground terminals. The said ground terminals are diagonally
disposed in the said housing and furthermore insert molded with the said housing. The pair of
14
positively charged terminals have been called as positive terminals onto which a pair of fixed
contact is riveted. The said positive terminals are diagonally insert moulded in the said cover of
said housing. The location of the said positive terminals are exactly opposite to the ground
terminals so that the said moving contact strip assembly can make or break the circuit upon
upward or downward movement of the said moving contact strip assembly. The said cover is
provided on the second side of the said housing. A pair of pushers in thermoplastic material is
disposed in the said housing in a pair cavities provided at predetermined locations. The said
cavities are so located that both the said pushers i.e. first and second pusher can be mounted
spaced apart from each other in lateral direction as well as in longitudinal direction as shown in
figures 8, 9 and 11. The said pushers have rounded ends. The said pushers are disposed between
the bottom surface of the said slider and the said moving contact strip assemblies. More
particularly, one end of the said pushers rest on the said moving contact strip at their middle
portion which are provided with inwardly curvature profile (412) as shown in figures 4-9. The
other ends of the pusher lie under the pair of said wedge portion provided on the said slider. The
pair of said wedge portions are located on the bottom surface of the said slider so to actuate the
either pusher at a time and the other remain in non-actuating condition. Referring to figure 16, a
wedge portion is provided with slot of predetermined length with the stopper faces at the both
ends of the slot. The said slot accommodates a stopper rib provided on the said housing. This
stopper rib will not allow to slide-out the slider from the left extreme end and right extreme end
of the said housing as well as the slot for stopper rib provided in the slider will allow the slider to
move onto the housing upto a predetermined travel path.
The present invention provides the said electromechanical window regulator with basic
regulating requirement which comprises to reverse the polarity of DC motor of the window. The
polarity of both output terminals is required to reverse in order to actuate the window up and
down. Furthermore, to understand the mechanism electrically, it is electrical requirement of
window regulator mechanism that in no regulating condition of regulator, both moving contact
strip assembly are in contact with the respective ground terminals in order to pass no current to
window regulator. Also, in regulating the window down condition, one of the moving contact
strip sub assembly makes contact with one of the output terminals resulting in passing current to
DC motor which results in rotating of output shaft of motor in a predetermined direction leading
to down of the window glass. Similarly, when the another moving contact strip assembly makes
15
contact to another output terminal which results in passing current to DC motor and hence the
rotating output shaft of motor rotates in a predetermined direction and/or in opposite direction to
above mention direction. This leads in to up of the window glass. The said electromechanical
regulator is able to work in low current as well as high current application. However, the
electromechanical regulator of present invention can withstand higher current rating ranging
8A~25A or up to 25A and lock current ranging 22 A~30 A or up to 30A. Preferably, the said
electromechanical regulator of present invention can withstand higher current up to 18A and lock
current up to 28A.
Referring figure 4, the said moving contact strip assembly makes contact at the said ground
terminals. The said moving contact strip assembly is secured firmly from its first end in the said
window down terminal insert molded in said housing via said rivet mounting whereas the said
moving contact strip assembly is assembled with said housing from its second end .The bottom
surface the said contact rivet which is curved in shape makes contact at ground terminal with a
sufficient and pre-loaded contact pressure. This sufficient contact pressure ensures that the
moving contact strip assembly remains in contact with the ground terminal in default condition
or in no switching condition. This contact pressure at ground position is achieved from pressed
height H-H’ of moving contact strip assembly. There is a restoring force generated in the said
moving contact strip assembly due to its own self-resilient properties which exerts positive
contact pressure at the said ground terminal in order to remain in contact with the said ground
terminals. In this condition, the said slider and the said both pushers are in their original position
or non-actuating condition.
Now, referring figure 5, as the user operates the knob in a predetermined direction preferably
angularly counter-clockwise to operate the automobile or vehicle window in downward
direction, the said connecting link slides the said slider horizontally in a predetermined direction
preferably in left direction to central line as shown in figure 3. Consequently, the respective or
first wedge portion of the said slider converts the force applied in horizontal direction into the
vertical direction by applying the pressure on the respective or first pusher in order to actuate the
said first pusher. The said pusher applies force or pressure on the respective or first said moving
contact strip assembly. Due to this pressure or applied force, the first said moving contact strip
assembly makes contact with the respective said fixed contact of respective said positive
16
terminal of said cover. During this operation of the said regulator, the second wedge portion of
the slider does not touch second pusher and hence does not actuates the second pusher. In this
way, the second moving contact strip assembly remains in contact with the ground terminal. This
is a window down switched condition of the said electromechanical window regulator.
The position S1 of the said slider represents horizontal stroke of the slider to just touch the
respective first pusher at position P1, from initial position of slider. This is free stroke of the said
slider according to an embodiment of the present invention. This intentional free stroke provide
required clearance between the first wedge portion of the said slider and the first pusher so as to
avoid any initial vertical stroke of the first pusher upon the said first moving contact strip
assembly. Otherwise, this pressing of the said first moving contact strip assembly may initially
lead in disconnection between moving contact rivet of the first moving contact strip assembly
and the respective said ground terminal and switch will not work when said second moving
contact strip assembly will be actuated to make contact at the respective said fixed contact of
said positive terminal of said cover. Position S2 of the slider represents horizontal stroke of the
slider to push the first pusher which presses the respective first moving contact strip assembly to
P2 position. This is switching stroke of the slider according to an embodiment of the present
invention wherein the said first moving contact strip assembly leaves the said ground terminal
and just touches the respective said fixed contact of said positive terminal of said cover in order
to close the circuit and to pass the current through them so as to actuate window in
predetermined direction. In addition, position S3 of the said slider represents horizontal stroke of
the slider to further push the said first pusher which presses the said first moving contact strip
assembly to P3 position. This is the end of the switching stroke of the slider (S1+S2+S3)
according to an embodiment of the present invention wherein the said first pusher position P2 to
P3 exerts positive contact pressure on the said first moving contact strip assembly by virtue of
vertical height tt’ travelled and in turn exerts positive contact pressure on the said output terminal
in order to run higher current to actuate window of a vehicle. Now, when the window of said
vehicle is completely down and switching is over, user will remove exerted actuation force on
the said knob and slider will regain its original or normal position by virtue of restoring force
(HH’+ hh’) developed in the respective said moving contact strip assembly.
17
Referring figure 6, as the user operates the knob in a predetermined direction preferably
angularly clockwise to operate the automobile or vehicle window in upward direction, the said
connecting link slides the said slider horizontally in a predetermined direction preferably in right
direction to central line as shown in figure 3. Consequently, the respective or second wedge
portion of the said slider converts the force applied in horizontal direction into the vertical
direction by applying the pressure on the respective or second pusher in order to actuate the said
second pusher. The said second pusher applies force or pressure on the respective or second said
moving contact strip assembly. Due to this pressure or applied force, the second said moving
contact strip assembly makes contact with the respective said second fixed contact of respective
said positive terminal of said cover. During this operation of the said regulator, the first wedge
portion of the slider does not touch first pusher and hence does not actuates the first pusher. In
this way, the first moving contact strip assembly remains in contact with the ground terminal.
This is a window up switched condition of the said electromechanical window regulator.
Referring figure 7, the location of vertical stopping faces provided on the said housing and
vertical stopping faces provided said slider can be seen. The said stopping faces stop the said
slider in said housing in such a way that the provided stopping faces are not having any
restriction which restricts required stroke of the said slider for operating window up and down.
The stopping faces have been depicted in the figure.
Referring figures 8, 9a and 9b, the positions of both pushers are being depicted according to an
embodiment of the present invention. The placement of pushers in the housing is designed in
such a manner that the pushers rest on the inwardly curvature profile provided in the free end
portion of the moving contact strip assembly. Due to the application of pressure by pusher on the
said free end portion, a high stress is being experienced/developed in this portion. In order to
withstand with maximum deflection by pusher and/or stress concentration, the inwardly
curvature has been provided in the moving contact strip assembly.
The said moving contact strip assemblies are having excellent combination of mechanical
properties and electrical properties such as excellent mechanical properties as tensile strength
and higher Young’s modulus and higher electrical conductivity.
18
Furthermore, the said moving contact strip assemblies are provided with angles ‘a’ and ‘b’ which
are responsible to exert required contact force at ground terminals.
The said moving contact strip assemblies where the stress developed in the entire moving contact
strip assembly and majorly higher at high stress zone-1 of the moving contact strip assembly.
The said moving contact strip assemblies where the said moving contact strip assemblies remains
in contact with ground terminals at normal or no switching condition.
The said moving contact strip assemblies where the said moving contact strip assembly
undergoes curve bend by dimension tt’, the moving contact strip assembly pulls towards middle
of its length and wipes it’s contact rivet over respective output terminal during generation of
contact force which leads in contact wiping, due to which unwanted carbon composition between
both contacting surfaces being wipe off.
The said moving contact strip assemblies where the moving contact strip assembly is compressed
during the operation of the regulator to HH’+hh’+tt’ height consequently both radius ‘e’ and ‘f’
overcome the developed high stress at bending corners.
A predetermined quantity of grease has been applied over the vertical faces of said first and
second pusher and vertical faces of a pair of said cavity of said housing in order to actuate said
pushers with minimal frictional forces. In addition a predetermined quantity of grease has been
applied over the sliding faces between a pair of said wedge portion and upper curved faces of a
pair of said pushers. Furthermore a predetermined quantity of grease has been applied over the
sliding faces between said housing and said slider.
Referring figure 10, insert molding of said positive terminal with said cover of said
electromechanical window regulator housing is depicted in the perspective view of said cover
sub assembly. The said positive terminals are being connected with the positive supply of the
vehicle battery. Onto the said positive terminal of the said cover terminal sub assembly, a pair of
said fixed contact is riveted. This pair of fixed contact is making or breaking contact with the
said pair of moving contact riveted in the said first and second moving contact strip sub
assembly. A pair of said fixed contact has been used to withstand higher current rating as per
said electromechanical window regulator switching requirement.
19
Referring figure 11, insert molding of at least a pair of ground terminal, at least a pair of positive
terminal, a window up terminal and a window down terminal with housing is depicted in the
perspective view of housing sub assembly of the electromechanical window regulator. These
terminals for insert molding in housing are manufactured in single terminal for ease of
manufacturing and cost effectiveness. After insert molding of said housing sub assembly, these
terminals have been parted by trimming process. The holes shown in figure are being provided
for securing of said moving contact strip assemblies.
Referring figure 13, the cover sub assembly is assembled with the housing sub assembly through
a provision of snap locking. The housing sub assembly is provided with plurality of locking
recess. Corresponding locking protrusions are being provided in the cover sub assembly in order
to provide firm locking between the both parts.
Referring figure 14, the electromechanical window regulator is provided with a provision of
LED seat inbuilt in the said housing sub assembly for the purpose of decorative symbol
illumination in the said knob of electromechanical window regulator in the dark according to an
embodiment of the present invention.
Advantages of the present invention:
The main advantage of the present invention is to provide an electromechanical window
regulator for an automobile.
Another advantage of the present invention is to provide an electromechanical window regulator
comprising moving contact strip assembly for making and breaking the contact in the circuit.
Still another advantage of the present invention is to provide an electromechanical window
regulator where the said moving contact strip assemblies are made of non-ferrous metal which is
having excellent combination of mechanical properties and electrical properties such as excellent
mechanical properties as tensile strength and higher Young’s modulus and higher electrical
conductivity.
Yet another advantage of the present invention is to provide an electromechanical window
regulator where the said moving contact strip assemblies are provided with angles ‘a’ and ‘b’
which are responsible to exert required contact force at ground terminals.
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Another advantage of the present invention is to provide an electromechanical window regulator
where the stress developed in the entire moving contact strip assembly and majorly higher at
high stress zone-1 of the moving contact strip assembly.
Still another advantage of the present invention is to provide an electromechanical window
regulator where the said moving contact strip assemblies remains in contact with ground
terminals at normal or no switching condition.
Yet another advantage of the present invention is to provide an electromechanical window
regulator where the said moving contact strip assembly undergoes curve bend by dimension tt’,
the moving contact strip assembly pulls towards middle of its length and wipes it’s contact rivet
over respective output terminal during generation of contact force which leads in contact wiping,
due to which unwanted carbon composition between both contacting surfaces being wipe off.
Another advantage of the present invention is to provide an electromechanical window regulator
where the moving contact strip assembly is compressed during the operation of the regulator to
HH’+hh’+tt’ height consequently both radius ‘e’ and ‘f’ overcome the developed high stress at
bending corners.
Still another advantage of the present invention is to provide an electromechanical window
regulator which can withstand with higher running current up to 18A and lock current up to 28A.
Yet another advantage of the present invention is to provide an electromechanical window
regulator the higher current rating is achieved by achieving quick contact make and quicker
contact return due to resilient property of moving contact spring which is independent of any
other returning force, providing appropriate contact force at contact terminals as per standards
between moving and fixed contact and by selecting of moving and fixed contact material which
can withstand higher current rating up to 18A and lock current up to 28A.
Another advantage of the present invention is to provide an electromechanical window regulator
where no need of application of grease at contact areas.
Still another advantage of the present invention is to provide an electromechanical window
regulator where a special material has been selected for contact rivets which comprises
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properties like higher thermal stability, higher resistance to micro welding and less contact
erosion.
Yet another advantage of the present invention is to provide an electromechanical window
regulator where the adequate contact separation has been provided between fixed and moving
contact to avoid contact burning by reducing the chattering.
Another advantage of the present invention is to provide an electromechanical window regulator
where the movement of moving contact strip assembly is horizontal in order to avoid dust and
foreign particles accumulation. Mounting of inventive regulator on printed circuit board (PCB) is
in such a way that inclination of both of moving contact strip sub assembly is normal to pcb
board and also the said inclination is normal to road surface. Therefore, foreign body or particles
will tend to fall downward and will not be accumulated on contact making areas.
Still another advantage of the present invention is to provide an electromechanical window
regulator with inbuilt provision of LED resting over housing part for decorative symbol
illumination in regulator knob.
Yet another advantage of the present invention is to provide an electromechanical window
regulator with such an operational feel mechanism of switch knob which leads the mechanism to
endure longer life and less operating force of regulator knob enhancing operational feel.
Furthermore another advantage of the present invention is that the said electromechanical
window regulator is first simulated completely on various simulation software for optimization
of structure of the inventive moving contact strip. The said electromechanical window regulator
has been completely validated and passed in the laboratory as per higher current requirement of
higher running current up to 18A and lock current up to 28A. The said electromechanical
window regulator has been completely validated and passed in the running test on actual vehicle
or automobile.
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We claim:
1. An electromechanical window regulator for an automobile comprising:
a knob (1) pivotaly;
a housing (100) comprising a first end (101) and a second end (102) opposite to the first
end (101);
a cover (300) for covering the second end (102) of housing (100);
a pair of fixed contact disposed on to at least a positive terminal (302’) insert molded in
the said cover (300);
at least a ground terminal (104) and a window up terminal (103) and a window down
terminal (103’) insert molded with the said housing (100);
a pair of moving contact strip assembly (400) disposed in the said housing (100) having
their first end (408) secured at predetermined position in window up and window down
terminal insert molded in the said housing and second ends (409) free able to move which
are consisting a pair of moving contact (402) so as to make contact with the said
respective ground terminal (104) and the said respective fixed contact;
a pair of pushers (105) disposed in the guides (105’) provided in the housing at
predetermined location;
a slider (200) disposed in the first end (101) of the housing and connected to the knob (1)
by means a of connecting link (2) so that pivotal movement of the knob results in sliding
movement of the slider;
the slider (200) comprising a pair of wedge portion (203) disposed on bottom surface of
the slider which faces the said housing and located at predetermined locations so as to
actuate the pushers (104) thereby actuating the respective moving contact assembly (400)
thereby making or breaking contacts with the respective fixed contacts for regulating
window up or down.
2. The window regulator as claimed in claim 1, wherein the pair of said fixed contact, is
firmly riveted in a pair of through holes provided in the predetermined location of the
said positive terminal (302’).
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3. The window regulator as claimed in claim 1, wherein the said ground terminal (104)
disposed in the housing is insert molded with housing act as ground terminal or negative
terminal.
4. The window regulator as claimed in claim 1, wherein the window up terminal (103) and
the window down terminal (103’) are insert molded with the said housing, comprises a
through hole provided at the predetermined location so as to accommodate the first ends
of moving contact strip assemblies in order to secure the moving contact strip assemblies.
5. The window regulator as claimed in claim 1, wherein the moving contact strip assembly
comprises a moving contact strip of predetermined length and cross-section having a
through hole on both ends of the moving contact strip, the hole (412) provided on second
end of moving contact strip assembly is provided to accommodate the moving contact
(402) which makes or breaks contact at ground and positive terminal.
6. The window regulator as claimed in claim 5, wherein the moving contact is provided
with curved surface (403) on one side and flat surface (403’) on the other side opposite to
curved surface.
7. The window regulator as claimed in claim 5, wherein the said moving contact strip is
provided with one or more rounded curve profiles (410, 411) at predetermined location(s)
being bent by predetermined angle(s).
8. The window regulator as claimed in claim 5, wherein the said moving contact strip is
provided with a curvature profile (412) at predetermined location where the stress is
being developed/experienced high.
9. The window regulator as claimed in claim 5, wherein the pair of moving contact strip
assembly is mounted in housing in such a way that the first ends of both moving contact
strips are diagonally secured by a pair of rivet mounting or securing means or fixing
means at predetermined locations.
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10. The window regulator as claimed in claim 1, wherein the knob is pivotally mounted on a
regulator body wherein the regulator body (3) encompasses the said housing which is
connected to the knob via connecting link (2).
11. The window regulator as claimed in claim 1, wherein during the operation of said
regulator and upon actuating the slider via knob of the said regulator, only one of the
moving contact strip is being actuated in order to make contact with the respective said
fixed contact in the said positive terminal provided in said cover while the other remain
in contact with the respective said ground terminal (104) in the said housing.
12. The window regulator as claimed in claim 1, wherein the pair of the said moving contact
strip assembly remains in contact with a pair of the said ground terminals of the regulator
during no operation condition of the said regulator.
13. The window regulator as claimed in claim 1, wherein the said slider (200) is provided
with one or more stopper faces and slot at predetermined location and one or more
stopper rib in the said housing.
14. The window regulator as claimed in claim 1, wherein the said regulator is able to
withstand high running current, preferably up to 18A, as well as high lock current,
preferably up to 28A.