FORM 2
THE PATENTS ACT, 1970 (39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, rule 13]
TITLE OF THE INVENTION
"MECHANISM FOR ENGAGING AND DISENGAGING THE MANUAL MODE FOR A MOTOR OPERATED AUTOMOBILE SIDE WINDOW
GLASS"
APPLICANT
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay house,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001, Maharashtra,
INDIA.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the disclosure and the manner in
which it is to be performed.

FIELD OF THE INVENTION
The present invention is related to the window winding mechanism for an automobile and more specifically it relates to a user friendly mechanism for engaging and disengaging the manual mode for a motor operated side window glass of an automobile.
BACKGROUND OF THE INVENTION
The existing power window mechanism in an automobile comprises of an electric motor that operates a worm shaft. The worm shaft in turn rotates a gear which is attached to a pulley. A cable is wound over the pulley; a clip that attaches to the window glass is fixed on the cable. When the pulley turns, the clip moves up and down carrying the glass along with it.
However, this mechanism being provided in vehicles today does not have any alternate means to operate the window glasses in case the power supply to the motor fails. Incidents of passengers getting trapped in the vehicle in events like flood have occurred in the past. Thus, there is a need for a manual operating mode for this mechanism.
Though inventions in the past have addressed this issue by incorporating a manual mode by simple modifications to the existing system, they lack a convenient means for the user to engage and disengage the manual mode. In some of these inventions the handle provided for operating the window in manual mode needs to be carried in the vehicle tool kit; the user must get the handle from the toolkit and fix it on the mechanism before operating it. Further, in the conventional mechanisms significant amount of movement need to be provided to the handle in the manual mode to completely open or close the window.

Thus, there is a need for the present invention that provides the user with a convenient means to engage and disengage the manual mode. Further, there also exists a need for providing the user with a more convenient means to completely open or close the window in manual mode.
OBJECTS OF THE INVENTION
The objective of disclosure is to provide a reliable, cost effective, easy to manufacture, and simple opening and closing mechanism for automobile side window glass.
Another objective of the present disclosure is to provide a mechanism for engaging and disengaging the manual mode for a motor operated automobile side window glass.
Another objective of the disclosure is to provide a mechanism for opening or closing automobile side window glass.
Further objects and features of the disclosure will become apparent from the following detailed description when considered in conjunction with the drawings.
SUMMARY OF THE INVENTION
The invention describes a mechanism for engaging and disengaging the manual mode of a motor operated window glass for vehicle, said mechanism comprising; at least one drive gear (1); a sleeve (2) for fixedly mounting said drive gear (1); at least one driven gear (3) connected to the worm shaft of the window glass operating motor; said driven gear (3) is operable coupled to said drive gear (1) in manual mode; a rotating shaft (4) disposed in said sleeve (2); at least one bearing

(5) for rotatably mounting of said rotating shaft (4); at least one pin (6) mounted on said sleeve (2) for locking and unlocking of said sleeve (2) with said rotating shaft (4); a first plunger assembly (7) disposed on said rotating shaft (4) for manual operated mode; at least one operating device (8) fixed on said sleeve (2) provided for manual operated mode; a second plunger assembly (9) mounted on the said sleeve (2) adapted for facilitating motor operated mode; at least one resilient means (10) disposed on said rotating shaft (4) for detaching said drive
gear out of mesh from driven gear upon disengagement of manual mode.
The operating device . (8) is a handle configured for engaging said manual operated mode by meshing drive gear (1) with driven gear (3). The first plunger assembly (7) is disposed in a hole provided on said rotating shaft (4) for engaging a stepped hole provided on the said sleeve (2). On application of axial force on operating device (8) towards door panel, the said plunger assembly (7) locks said sleeve (2) with said rotating shaft (4). The handle (8) is adapted for rotating said shaft (4) with said sleeve (2) along with drive gear (1) which is meshed with said driven gear (3) enabling the manual operated mode. The rotating shaft (4) comprises a keyway (11) in which said pin (6) is slidably disposed to stop against the ends of said keyway (11) for preventing any relative rotary motion between said sleeve (2) and said rotating shaft (4) and for constant alignment of locking and unlocking arrangement.
The second plunger assembly (9) is adapted to be located above said stepped hole provided on the said sleeve (2) and on pressing the said second plunger assembly (9), said first plunger (7) is pushed out of said stepped hole which unlocks said sleeve (2) and said rotating shaft (4) enabling said resilient means (10) to push said sleeve (2) thereby disengaging said drive gear (1) from the said driven gear (3) to facilitate disengaging of said manual operated mode. The first and second plunger assemblies are spring loaded.

The resilient means (10) is a helical spring concentrically disposed in compression on said rotating shaft (4) for detaching said drive gear (1) out of mesh from said driven gear (3) and adapted to place the manual operated mode to its original position once disengaged.
STATEMENT OF THE INVENTION
Accordingly the present invention describes a mechanism engaging and disengaging the manual mode of a motor operated window glass for vehicle, said mechanism comprising;
at least one drive gear (1);
a sleeve (2) for fixedly mounting said drive gear (1);
at least one driven gear (3) connected to the worm shaft of the window glass operating motor; said driven gear (3) is operable coupled to said drive gear (1) in manual mode;
a rotating shaft (4) disposed in said sleeve (2);
at least one bearing (5) for rotatably mounting of said rotating shaft (4);
at least one pin (6) mounted on said sleeve (2) for locking and unlocking of said sleeve (2) with said rotating shaft (4);
a first plunger assembly (7) disposed on said rotating shaft (4) for manual operated mode;
at least one operating device (8) fixed on said sleeve (2) provided for manual operated mode;

a second plunger, assembly (9) mounted on the said sleeve (2) adapted for facilitating motor operated mode;
at least one resilient means (10) disposed on said rotating shaft (4) for detaching said drive gear out of mesh from driven gear upon disengagement of manual mode.
BRIEF DESCRIPTION OF THE INVENTION
The handle is provided on the door panel at a convenient location for operating the window in manual mode. To engage the manual mode, the user just needs to press the handle towards the door panel. The manual mode gets engaged and the handle will get locked in this position. Rotating the handle in this state operates the window in manual mode. To disengage the manual mode, the user has to push a pin provided by the side of the handle. The handle will pop back disengaging the manual mode. The handle is detached from the rest of the mechanism in his state and so operating the window in power operated mode in this state will not rotate the handle.
It is to be understood that both the foregoing general description and the following detailed description are not limited but are intended to provide further explanation of the invention claimed. The accompanying drawings, which are incorporated in and constitute part of this specification, are included to illustrate and provide a better understanding of the method and system of invention. Together with the description, the drawings serve to explain the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure-1 shows the mechanism when the window glass is in motor operated mode.

Figure-2 shows the mechanism when the window glass is in manual operated mode.
Figure-3 shows the mechanism when the window glass is in manual operated mode, in accordance with another embodiment of the present disclosure.
Figure-4 shows the mechanism when the window glass is in motor operated mode, in accordance with another embodiment of the present disclosure.
Figure-5 shows a portion of the mechanism when the window glass is in manual operated mode, in accordance with another embodiment of the present disclosure.
Figure-6 shows a portion of the mechanism when the window glass is in motor operated mode, in accordance with another embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE DISCLOSURE
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the disclosure only, and not for the purpose of limiting the same.
Now referring to figure-01 and -02 , in accordance with the present invention, mechanism for engaging and disengaging the manual mode for a motor operated side window glass, said mechanism comprises; a rotating shaft (4), a bearing (5) on which said rotating shaft (4) is rotatably mounted , a sleeve (2) mounted on the said rotating shaft (4) , a drive gear (1) fixed on said sleeve (2), a pin (6) mounted on said sleeve (2), a keyway (11) cut on the said rotating shaft (4), first spring loaded plunger (7) which sits in a hole drilled in said rotating shaft (4), a second spring loaded plunger (9) mounted on the said sleeve (2), a helical spring (10), a handle (8) fixed on the sleeve (2), a driven gear (3) connected to the worm shaft of the motor that operates window glass when in power mode. The said spring loaded

plunger 9 is used to disengage the manual mode. Said helical spring 10 detaches said drive gear (1) and said driven gear (3) out of mesh when manual mode is disengaged. Said pin (6) rides in the said keyway (11).
Referring to figure-01, which shows the mechanism when the window is in motor operated mode, the said drive gear 1 and said driven gear 3 are not meshed and therefore the mechanism does not interfere with the normal operation of the power window. The location of said handle 8 is outside the door panel. Said door handle 8 is stationary when the window glass is operated using motor.
Figure-02, shows the mechanism when the window is in manual operated mode. The manual operated mode is achieved by pushing the said handle 8 towards the door panel. The said drive gear 1 fixed on the said sleeve 2 moves and meshes with the said driven gear 3. The said pin 6 which is provided on the said sleeve 2 slides in the said keyway 11 provided on the said rotating shaft 4. The said first spring loaded plunger 7 disposed in the said rotating shaft 4 engages a stepped hole provided on the said sleeve 2 and locks the said sleeve 2 and said rotating shaft 4 together in this position.
When the said handle 8 is rotated, the said rotating shaft 4 rotates in said bearing 5 along with the said drive gear 1 fixed on the said sleeve 2. The rotation of said drive gear (1) which is now meshed with the said driven gear 3 rotates the said driven gear 3 which is fixed on the worm shaft of motor. This enables to operate the window glass.
The manual mode of operation of said override mechanism is disengaged by pressing the said second plunger 9. The said second plunger 9 is located above the said stepped hole provided on the said sleeve 2. When the said second plunger 9 is pressed, the said first plunger 7 is pushed out of the said stepped holes on the said sleeve 2 thereby unlocking the said sleeve 2 and said rotating shaft 4. Said helical spring 10 pushes the said sleeve 2 out thereby disengaging the said drive gear 1

from the said driven gear 3. The said pin 6 mounted on the said sleeve 2 rides in the said keyway slot 11 provided on the said rotating shaft 4 till the said pin 6 stops against the end of the slot. The said pin 6 and slot arrangement also prevents any relative rotation between the said sleeve 2 and the said rotating shaft 4 thereby keeping the locking and unlocking arrangement of the said sleeve 2 and said ' rotating shaft 4 always in alignment.
Referring now to FIG. 3 to 6, which illustrate another embodiment of the present disclosure, the window glass operating mechanism includes following elements. As would be apparent to those skilled in the art, the vehicle window utilizing the window glass operating mechanism includes a window glass operated by a pulley (100), a drive gear (103) capable of being driven by a motor (102). The window glass operating mechanism includes a gear shaft (104) fixedly connected to the drive gear (103). The gear shaft (104) includes a sleeve having a keyway. Further, a pulley shaft (106) is positioned concentrically within the gear shaft (104) and fixedly connected to the pulley (100). The pulley shaft (106) also includes a sleeve having a keyway.
Further, a handle shaft (108) is positioned concentrically within the pulley shaft (106). Particularly, an end portion of the handle shaft (108) includes a keyway, and the end portion of the handle shaft (108) is positioned concentrically within the pulley shaft (106). An opposite end portion of the pulley shaft (106) is connected to a handle (109), shown in FIG. 3, and 4.
A spring loaded key (112) is provided on the handle shaft (108). The spring loaded key (112) includes a helical spring (114) wound over end portion of the handle shaft (108) . An end portion of the helical spring (114) is stopped on the handle shaft by a step on the handle shaft (108) , while another end of the helical spring (114) carries the key (112).

When the gear shaft (104), the pulley shaft (106) are assembled over the handle shaft (108), the key (112) is adapted to be engaged with the keyways on the gear shaft (104), the pulley shaft (106) and the handle shaft (108).
The window glass operating mechanism further more includes a spring loaded plunger (110). The spring loaded plunger (110) is provided on the handle shaft (108) at a bearing (111). More specifically, the spring loaded plunger (110) is carried by the bearing, and a ball of the spring loaded plunger (110) is biased by a spring towards the handle shaft (108). The handle shaft (108) includes two peripheral grooves, which will be engaged by the ball of spring loaded plunger (110) when the handle shaft moves axially to and fro to engage and disengage the manual mode. As best shown in FIG. 5, when the spring loaded plunger (110) rests in the first peripheral groove, the handle shaft (108) is in a first position and the key (112) engages the pulley shaft (106) and the handle shaft (108). In such a position, the window glass operating mechanism is in a manual mode. As an advantage, since the pulley shaft (106) and the handle shaft (108) are locked by the key (112), the manual movement to the handle shaft (108) is directly transferred to the pulley shaft (106).
However, As best shown in FIG. 6, when the spring loaded plunger (110) rests in the second peripheral groove, the handle shaft (108) is in a second position and the key (112) engages pulley shaft (106) and the gear shaft (104) and disengages from the handle shaft. In such a position, the window glass operating mechanism is in a power mode.
During application of the present disclosure, in manual mode the user has to pull the handle (109) away from the door panel. This will pull the handle shaft (108) outside engaging it to the circular key (112). The circular key (112) is pulled out with handle shaft (108) and is engaged only with the pulley shaft (106). The spring loaded plunger (110) locks the manual mode by locking the groove on the handle

shaft (108). This will disengage the electric operated mode and activates the manual mode. Now the handle (109) can be rotated to lift or lower the window glass.
Further, to engage electric mode the user has to push the handle (109) towards the door panel. This will push the handle shaft (108) and circular key (112) inside. The circular key (112) is engaged with keyway of pulley shaft (106) and gear shaft (104) thus locking them together. The handle shaft (108) disengages from the circular key (112) and is free to rotate. The spring loaded plunger (110) locks the manual mode by locking the groove on handle shaft (108).
When the power window motor is operated, the shaft of the motor will rotate the drive gear (103) which is fixed to gear shaft (104) . The gear shaft (104) and pulley shaft (106) are locked by the circular key (112). This rotates the pulley shaft (106) and in turn rotates the pulley (100) fixed on the pulley shaft. This actuates the electric mode. Also the handle (109), which will be located outside the door panel, will be stationary when the window glass operates in this mode.
The power supply to the motor needs to be cut, when the window glass operating mechanism is in manual mode. This is particularly significant in case of the first embodiment disclosed wherein bevel gears drive the motor (shown in FIG. 1). Accidental operation of electric motor while in manual mode may cause the handle to rotate and cause injury to user. To cut off the power to the motor while manual mode is active, the motor electric circuit may be altered by incorporating a switch operated by the handle provided for manual mode. When the handle position is in power mode, the switch will be closed and motor will be operational via the regular window winding switch. When the handle position in manual mode, this switch will be open and if the regular window winding switch is operated, the motor will not function.

The foregoing description provides specific embodiments of the present disclosure. It should be appreciated that these embodiment are described for purpose of illustration only, and that numerous other alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the disclosure. It is intended that all such modifications and alterations be included insofar as they come within the scope of the disclosure as claimed or the equivalents thereof.

Referral Numerals Description
1 Drive gear
2 Sleeve
3 Driven gear
4 Rotating shaft
5 Bearing
6 Pin
7 First spring loaded plunger
8 Handle
9 Spring loaded plunger
10 Helical spring
11 Keyway

100
Pulley
102 Motor
103 Drive gear
104 Gear shaft
106 Pulley shaft
108 Handle shaft
109 Handle
111 Bearing
110 Spring loaded plunger
112 Spring loaded circular key
114 Helical spring

WE CLAIM
1. A mechanism for engaging and disengaging the manual mode of a motor operated window glass for vehicle, said mechanism comprising;
at least one drive gear (1);
a sleeve (2) for fixedly mounting said drive gear (1);
at least one driven gear (3) connected to the worm shaft of the window glass operating motor; said driven gear (3) is operable coupled to said drive gear (1) in manual mode;
a rotating shaft (4) disposed in said sleeve (2);
at least one bearing (5) for rotatably mounting of said rotating shaft (4);
at least one pin (6) mounted on said sleeve (2) for locking of said sleeve (2) with said rotating shaft (4);
a first plunger assembly (7) disposed on said rotating shaft (4) for facilitating manual operated mode;
at least one operating device (8) fixed on said sleeve (2) provided for manual operated mode;
a second plunger assembly (9) mounted on the said sleeve (2) adapted for facilitating motor operated mode;
at least one resilient means (10) disposed on said rotating shaft (4) for detaching said drive gear out of mesh from driven gear upon disengagement of manual mode.

2. The mechanism as claimed in claim 1, wherein said operating driven (8) is a handle configured for engaging said manual operated mode by meshing drive gear (1) with driven gear (3)
3. The mechanism as claimed in claim 1, wherein said first plunger assembly (7) is disposed in a hole provided on said rotating shaft (4) for engaging a stepped hole provided on the said sleeve (2) on application of force axial force on operating device (8) towards door panel to said sleeve (2) with said rotating shaft (4).
4. The mechanism as claimed in claim 1, wherein said handle (8) is adapted for rotating said shaft (4) with said sleeve (2) along with drive gear (1) which is meshed with said driven gear (3) enabling the manual operated mode.
5. The mechanism as claimed in claim 1, wherein said rotating shaft comprises a keyway (11) in which said pin (6) is slidably disposed to stop against the ends of said keyway (11) for preventing any relative rotary motion between said sleeve (2) and said rotating shaft (4) and for constant alignment of locking and unlocking arrangement.
6. The mechanism as claimed in claim 1, wherein said second plunger assembly (9) is adapted to be located above said stepped hole provided on the said sleeve 2 and pressing of said second plunger assembly (9), said first plunger (7) is pushed out of said stepped hole which unlocks said sleeve 2 and said rotating shaft 4 enabling said resilient means (10) to push said sleeve 2 thereby disengaging of said drive gear (1) from the said driven gear (3) to facilitate disengaging of said manual operated mode.
7. The mechanism as claimed in claim 1, wherein said first and second plunger assemblies are spring loaded.
8. The mechanism as claimed in claim 1, wherein said resilient means (10) is a helical spring concentrically disposed in compression on said rotating shaft (4) for

detaching said drive gear (1) out of mesh from said driven gear (3) and adapted to place the manual operated mode to its original position once disengaged.
9. A window glass operating mechanism for a vehicle window having a pulley
(100), and a drive gear (103) capable of being driven by a motor (102), the
window glass operating mechanism comprising;
a gear shaft (104) fixedly connected to the drive gear (103);
a pulley shaft (106) positioned concentrically within the gear shaft (104) and fixedly connected to the pulley (100);
a handle shaft (108) positioned concentrically within the pulley shaft (106), an end portion of the handle shaft being fixedly connected to a handle;
a spring loaded plunger (110) provided on a bearing (111) for locking the bearing on the handle shaft (108) in a first position or a second position;
a spring loaded key (112) provided on the handle shaft (108) such that the spring loaded key (112) in the first position of the handle shaft (108) connects the handle shaft (108) with the pulley shaft (106), and in the second position of the handle shaft (108) connects the pulley shaft (106) with the gear shaft (104) and disengages from the handle shaft (108).
10. A window glass operating mechanism as claimed in claim 9, wherein the spring loaded key includes a helical spring (114) wound over the handle shaft (108) and a key (112).
11. A window glass operating mechanism as claimed in claim 10, wherein each of the gear shaft (104), pulley shaft (106) and a handle shaft (108) include a respective key slot. '
12. A window glass operating mechanism as claimed in claim 11, wherein the handle shaft (108) further includes a pair of peripheral grooves, such that the

spring loaded plunger (110) engages with a first groove and second groove to lock the handle shaft (108) in the first position and second position respectively.
13. A window glass operating mechanism as claimed in claim 12, wherein the spring loaded plunger (110) further include a helical spring for pushing a ball shaped plunger against the handle shaft (108).