FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION A Novel Window Winding Mechanism
APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Mr. Sachin Thakur and Mr. Madhav Landage
both are Indian nationals
of TATA MOTORS LIMITED,
an Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatrna Chowk,
Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention and the manner in which it is performed.

FIELD OF INVENTION
A window winding mechanism is proposed which gives a low cost and high efficiency system for lifting door glasses of automobiles.
BACKGROUND OF INVENTION
Vehicles are provided with door so that passengers can enter and exist conveniently. These doors are usually provided with openings like window to facilitate ample light and air inside the cabin of the vehicle. Further windows provided with glass such that it can raised or lowered according to the convenient of the passengers. All vehicles have window glass winding mechanisms by which the glass can be raised for lowered. These mechanisms can be mechanical or electrical by the help of an electrical motor. The mechanical systems have a window regulator and crank handle by which it can be rotated to lower or raise the window glass. Usually these handles are located on the door trim panel and window regulator is assembled in side the panel. A shaft connects the handle with the window regulator.
Conventional window regulator mechanisms are primarily of two types, arm and sector type and cable-drum type mechanism. The arm and sector type mechanism has an arm attached to a sector. The sector is engaged to a pinion which drives the sector, the arm has a roller at the end which slides inside a channel which is fixed on to the window glass. When the pinion rotates the sector and arm rotates and the arm in turn moves the window glass via the channel fixed on the glass. The main disadvantage of the arm and sector type of window regulator mechanism is that the glass is not moved along its centre of gravity and hence has a tendency to tilt and go up or down, creating high friction and wear and tear of the seals during the movement.
The cable-drum type mechanism has a drum which is the driving unit and a cable winds or unwinds onto the drum depending on the direction of movement of the

glass. The glass is connected to a slider which in turn is connected to the cable, the slider also slides inside a channel fixed on the door panel. As the wire is wound by the drum, the slider moves and in turn moves the window glass.
The cable-drum type window regulator mechanism is costlier because of the cable construction and the usage of complex pulley arrangement makes it susceptible to frequent failures.
OBJECTS OF INVENTION
The main objective of the invention is to give a low cost window winding
mechanism.
Another objective is to give a high performance window winding mechanism.
STATEMENT OF INVENTION
Accordingly the present invention describes a window winding mechanism for a vehicle comprising
at least one main arm [2] with channeled configuration and a sector gear [4]
at one end is pivotally attached to a base plate [3] fixed to the vehicle door
panel;
at least one pinion gear [8] pivotally attached to the base plate meshes with the said sector gear [4];
at least one guide channel [1] with the sliding device [5] is fixed to the vehicle door panel;
at least one roller assembly (7) integrated on said sliding device (5) and; said roller (7) slidably connected to the channel of said main arm.
SUMMARY OF INVENTION
According to the present invention the window winding mechanism comprises a pinion gear for activating the mechanism, sector gear with main arm formed with guiding arrangement, a roller mating with the main arm channel and capable of

moving along the arm, said roller integrated to a slider which mated to a guide channel fixed to door and a window glass connected to the slider at the other end. The sector gear is rotated through the pinion gear mechanism which in turn rotates the main arm. The main arm is in the form of a channel and is mating to a roller. The roller is integrated to a slider which is mated to the guide channel at one end and the glass at the other. The guide channel is such that it represents the locus of the path of the centre of gravity of the glass as it moves from its bottom most position to its top most position.
The window winding mechanism for a vehicle comprising at least one main arm [2] with channeled configuration and a sector gear [4] at one end is pivotally attached to a base plate [3] fixed to the vehicle door panel; at least one pinion gear [8] pivotally attached to the base plate meshes with the said sector gear [4]; at least one guide channel [1] with the sliding device [5] is fixed to the vehicle door panel; at least one roller assembly (7) integrated on said sliding device (5) and; said roller (7) slidably connected to the channel of said main arm.
The sector gear (4) integrated with main arm (2) is rotated by the pinion gear (8). The sliding device [5] is a slider adapted for connecting the window glass, said main arm [2] and the guide channel [1]. The rotation of said main arm (2) moves the roller (7) along the main arm channel, simultaneously moves the sliding assembly (5) connected to the roller (7) along said guiding channel (1). One end/side of said sliding device (5) is configured to slide along guide channel (1) and on other end/side a window glass is attached.
The main arm (2) is a 'C shaped guide channel or a slotted channel. The guide channel (1) is configured to represent the locus of the path of the centre of gravity of the glass as it moves from its bottom most position to its top most position.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 shows the window winding mechanism according to present invention

Figure 2 shows the guided channel arrangement for raising and lowering the
window glass.
Figure 3a to 3c shows the mechanism at top, middle and lowered positions.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE
INVENTION
Referring now to the drawings wherein the showings are for the purpose of illustrating preferred embodiments of the invention only, and not for the purpose of limiting the same.
Referring to fig 1 and fig 2, the main construction consists of a main arm [2] pivoted about a point [6] on a base plate [3] attached to the door panel and having a sector gear [4] at one end. A pinion [8] is attached to the base plate and meshes with the sector gear [4], The guide channel [1] is fixed to the door and has a provision for a slider [5] which functions as a connector between the glass, the main arm [2] and the guide channel [1].
The slider [5] on one end has a suitable profile and material which assists in movement along the guide channel [1]. The other end of the slider [5] has a suitable profile to connect / mate to the window glass. The main arm [2] is in the form of a 'C' shaped guide channel or a slotted channel which mates/ is connected with a roller [7] integrated to the slider [5], throughout the movement of the mechanism. The roller [7] moves along the main arm (2) during rotation of the arm and this makes the slider (5) to move along the guiding channel [1] and the main arm [2]. Figure 3a to 3c shows the mechanism at different level of window glass.
OPERATION
The rotation input to the mechanism is via pinion [8] (either manual or motorized), pivotally mounted to a base-plate [3] which drives the sector gear [4]. The sector gear is connected / mated to the main arm [2] which is in the form of a guiding

member and pivoted on base plate [3] at point [6]. The rotation of the pinion [8] transfer to the sector gear [4] which in turn rotates the main arm [2] about the point [6]. Thus when the said sector rotates the said main arm also rotates and in turn moves the slider [5] along the guiding channel [1], The said slider is forced to slide along the said guide channel at one end and hence the said glass also moves along the path of the said guide channel. Since the guide channel [1] is fixed to the door and during the rotation of the main arm the slider [5] start moving along the main arm [2] also. The movement of the slider along the main arm is made possible by the roller [7] attached to the slider. The mechanism of operation is just opposite for up and down movement of the glass.
Figure 3 a shows the slider at top position and when the glass is attached to the slider, it also keeps at its top position. For lowering the glass the pinion is rotated so that the sector gear rotates the arm attached to it. This rotational movement lowers the slider along the guided channel. The rotation of the main arm is achieved by the simultaneous movement of the slider along the main arm with help of the roller. The glass connected to the slider also will start moving downward. Figure 3b and 3c shows the positions of slider at middle and lowered glass positions.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.

WE CLAIM
1. A window winding mechanism for a vehicle comprising
at least one main arm [2] with channeled configuration and a sector gear [4] at one end is pivotally attached to a base plate [3] fixed to the vehicle door panel;
at least one pinion gear [8] pivotally attached to the base plate meshes with the said sector gear [4];
at least one guide channel [1] with the sliding device [5] is fixed to the vehicle door panel;
at least one roller assembly (7) integrated on said sliding device (5) and; said roller (7) slidably connected to the channel of said main arm.
2. The mechanism as claimed in claim 1, where in said sector gear (4) integrated with main arm (2) is rotated by the pinion gear (8).
3. The mechanism as claimed in claim 1, wherein said sliding device [5] is a slider adapted for connecting the window glass, said main arm [2] and the guide channel [1]
4. The mechanism as claimed in claim 1, wherein the rotation of said main arm (2) moves the roller (7) along the main arm channel, simultaneously moves the sliding assembly (5) connected to the roller (7) along said guiding channel (1).
5. The mechanism as claimed in claim 1, wherein one end/side of said sliding device (5) is configured to slide along guide channel (1) and on other end/side a window glass is attached.
6. The mechanism as claimed in claim 1, wherein said main arm (2) is a 'C shaped guide channel or a slotted channel.

7. The mechanism as claimed in claim 1, wherein said guide channel (1) is configured to represent the locus of the path of the centre of gravity of the glass as it moves from its bottom most position to its top most position.
8. The window winding mechanism for a vehicle substantially as herein described with reference to the accompanying drawings.