FORM 2
THE PATENTS ACT 1970 (as amended)
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: "CLUTCH PEDAL EFFORT REDUCTION MECHANISM WITH VARIABLE PEDAL RATIO FOR CABLE OPERATED CLUTCH CONTROLS"
NAME AND ADDRESS OF THE 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.
Nationality: INDIAN
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

TECHNICAL FIELD
The disclosure is related to clutch control mechanism, more particularly relates to clutch pedal effort reduction mechanism with variable pedal ratio for cable operated clutch controls.
BACKGROUND OF THE DISCLOSURE
Figs 1 and 2 illustrate existing clutch control mechanism. The clutch control mechanism (100 ') includes pedal mounting bracket (I1) is fixed to control mounting bracket which is mounted on vehicle (not shown). A clutch pedal lever (31) and an actuating lever do1) are mounted on pin (41) which is pivoted to bracket (9'). There is no relative motion between the clutch pedal lever (31) and the actuating lever (101). A clutch cable yoke (61) is pivoted to other end of the actuating lever (10') using a pin (71). As shown in Fig. 2, when the clutch pedal is pressed, the actuating lever (10') along with the clutch pedal lever (3[) pivots around pin (4') and thus causing the actuating lever (10') to pull the clutch cable yoke (6) thereby actuating the clutch. The clutch cable yuke (6') along with pin (7'] travels along me path X as shown in FIG. 1. The aforementioned clutch mechanism still requires a spring to maintain the pedal in its rest or non-pressed position.
In this prior art, the moment exerted by the driver to actuate the pedal lever is constant from beginning to end of the movement and can be expressed by the equation mentioned below
Fw X a - Fy X b ………………………………………………. [I]
Wherein Fw is the force on clutch pedal lever (3), Fy is the force on actuating lever (101); 'a' is the distance between pedal lever (31) and pivot pin (41) V; 'b' is the distance between axis of pivot pin (4') and pin (7') on the actuating lever (10'). The distance 'a' & 'b' remains same in the entire pedal travel, therefore Fw remains same till the end of the travel.
As illustrated in the above equation, one can infer that greater pressure plate load is required for higher load capacity vehicles which in turn increases the pedal effort at driver's end.
To accommodate the more pedal effort, hydraulically operated mechanism is used. The hydraulically operated clutch pedals are highly expensive and complex in qesign with respect to cable operated

clutch pedal. Therefore, there exists a need to provide a system to reduce the force to actuate the clutch pedal in automobiles, particularly in cable operated clutch pedal.
OBJECTS OF THE DISCLOSURE
One object of the present disclosure is to provide a clutch pedal mechanism for an automotive vehicle which can be provided with a variable clutch pedal ratio.
One object of the present disclosure is to provide clutch pedal mechanism which is designed to reduce the force exerted by a driver of an automotive vehicle, especially in case of vehicles with cable operated clutch controls.
One object of the present disclosure is to provide a clutch pedal mechanism which is less expensive than that of existing hydraulically operated clutch pedal mechanism.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure is related to a clutch pedal mechanism, comprising a control mounting bracket fixed to a vehicle, a pedal mounting bracket connected below to the control mounting bracket, a clutch pedal pivotally connected to the pedal mounting bracket, characterized in that, an actuating lever configured with an extended sliding surface at its free end and connected to the clutch pedal, wherein the actuating lever is pivotally connected to the pedal mounting bracket, a support bracket mounted to control mounting bracket of the vehicle at predetermined distance from the pedal mounting bracket and a link comprising plurality of connecting ends and plurality of arms, wherein the link is connected to the support bracket at one end and to a clutch cable yoke at its other end, and also provides for a method of assembling a clutch pedal mechanism, comprising mounting a control mounting bracket to a vehicle, connecting a pedal mounting bracket below the mounted control mounting bracket, pivotally connecting a clutch pedal to the connected pedal mounting bracket, pivotally connecting an actuating lever to the pivotally connected clutch pedal and to pedal mounting bracket, connecting a support bracket to the vehicle at predetermined distance from the pedal mounting bracket and connecting a link to the support bracket at one end and to a clutch cable yoke at its other end.

SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the present disclosure. 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.
In one embodiment, the present disclosure provides for a clutch pedal mechanism. The clutch pedal mechanism comprising a control mounting bracket fixed to a vehicle and a pedal mounting bracket is connected below to the control mounting bracket. A clutch pedal lever is pivotally connected to the pedal mounting bracket. The clutch pedal mechanism further comprising an actuating lever configured with an extended sliding surface at its free end and is connected to the clutch pedal lever. The actuating lever is pivotally connected to the pedal mounting bracket and a support bracket is mounted to a control mounting bracket of the vehicle at predetermined distance from the pedal mounting bracket. A link comprising plurality of connecting ends and plurality of arms is connected to the support bracket at one end and to a clutch cable yoke at its other end.
In one embodiment of the present disclosure, the clutch pedal lever and the actuating lever are pivotally fixed to the pedal mounting bracket using a pin.
In one embodiment of the present disclosure, the link is pivotally connected to the support bracket and the clutch cable yoke using pins and is slidably mounted onto the extended sliding surface of the actuating lever. Shape of the link includes but is not limited to angled link and straight link.
In one embodiment of the present disclosure, the actuating lever optionally configured with a slot to form as the extending sliding surface.
In one embodiment the present disclosure provides for a method of assembling a clutch pedal mechanism, comprising mounting a control mounting bracket to a vehicle and connecting a pedal mounting bracket below the mounted control mounting bracket, pivotally connecting a clutch pedal to the connected pedal mounting bracket, pivotally connecting an actuating lever to the pivotally connected clutch pedal and to pedal mounting bracket connecting a support bracket to the vehicle at

predetermined distance from the pedal mounting bracket and connecting a link to the support bracket at one end and to a clutch cable yoke at its other end.
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 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:
FIG. 1 shows a schematic plane side view showing a clutch pedal mechanism in non-operated condition (without the clutch pedal being pressed) according to prior art.
FIG. 2 shows a schematic plane side view showing a clutch pedal mechanism in operated condition (with the pedal being pressed) according to the prior art.
FIG. 3 shows the schematic plane side view showing the clutch pedal mechanism in non-operated condition (without the pedal being pressed) according to one embodiment of the present disclosure.
FIG. 4 shows the schematic plane side view showing the clutch pedal mechanism showing the clutch pedal arrangement in half pressed condition according to one embodiment of the present disclosure.
FIG. 5 shows the schematic plane side view showing the clutch pedal mechanism, showing clutch pedal arrangement in full pressed position according to one embodiment of the present disclosure.
FIG. 6 shows the schematic plane side view showing the clutch pedal mechanism, showing the wear travel position of clutch pedal arrangement according to one embodiment of the present disclosure.
FIG. 7 shows schematic plane side view showing clutch pedal arrangement in non-operated condition (without the clutch pedal being pressed) according to another embodiment of the present disclosure.
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
In the following detailed description, reference is made to the accompanying figures, which form a part hereof. In the figures, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, and figures are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and make part of this disclosure.
Referral numerals

Referral numeral Description
l1 Control mounting bracket according to prior art
3' Clutch pedal lever according to the prior art
4' Pin for mounting clutch pedal lever and actuating lever according to the
prior art
61 Clutch cable yoke according to the prior art
7' Pin for mounting clutch cable yoke with the actuating lever according to
the prior art
9' Pedal mounting bracket according to the prior art
10' Actuating lever according to the prior art
too1 Clutch pedal mechanism according to prior art
1 Control mounting bracket according to the present disclosure
2 Support bracket according to the present disclosure
1 j Clutch pedal lever according to the present disclosure
4 Pin for mounting clutch pedal lever and actuating lever according to the
present disclosure
5 Link according to the present disclosure

5a Connecting ends of the link
5b Plurality of arms of the link
6 Clutch cable yoke
7 Pin for mounting clutch cable yoke with actuating lever according to the
present disclosure
8 Support pin for mounting link with support bracket according to the
present disclosure
9 Pedal mounting bracket according to the present disclosure
10 Actuating lever according to the present disclosure
12 Sliding surface on the actuating lever according to the present disclosure
12a Slot on the actuating lever according to the present disclosure
100 Clutch pedal mechanism according to the present disclosure
Referring now to the drawings/figures wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same.
Figs 3-6 illustrates first embodiment of the clutch pedal mechanism (100) for reducing clutch effort with variable pedal ratio according to the present disclosure. The clutch pedal mechanism (100), comprises a control mounting bracket (1) fixed to a vehicle. A pedal mounting bracket (9) is connected below the control mounting bracket (1). A clutch pedal lever (3) is pivotally connected to the pedal mounting bracket (9). The clutch pedal mechanism (100) is characterized into an actuating lever (10) configured with an extended sliding surface (12) at its free end and connected to the clutch pedal lever (3) such that the actuating lever (10) is pivotally connected to the pedal mounting bracket (9), a support bracket (2) mounted to control mounting bracket of the vehicle at predetermined distance from the pedal mounting bracket (9) and a link (5) comprising plurality of connecting ends (5a) and plurality of arms (5b), wherein the link (5) is connected to the support bracket (2) at one end and to a clutch cable yoke (6) at its other end.
During operation, when clutch pedal lever (3) is pressed by the user, the clutch pedal lever (3) along with the actuating lever (10) pivots around pivot pin (4), causing the clutch cable yoke (6) to pull upwards. With this movement, the clutch cable yoke (6) along with pin (7) travels along the path 'Y' as shown in FIG. 3. In this case the link (5) forces the clutch cable yoke (6) to travel along the path

'Y'. To accommodate the change in path, the sliding surface (12) is provided on actuating lever (10). The clutch cable yoke (6) slides on actuating lever (10) till the end of the clutch pedal lever (3) travel. As the path 'Y' is rotational about the support pin (8), the link (5) directs the clutch cable yoke (6) along the path 'Y\ Thus, as shown in FIG. 4 & FIG. 5 the distance 'b' goes on decreasing at the middle of the travel and gradually comes to original distance at the end of pedal travel. Here, the moment exerted by the user does not remains constant, it goes on decreasing till the middle of the travel and gradually comes back to original position at the end of the clutch pedal lever (3) travel.
The same equation [ 1 ] applies in this case
FWX a = Fy X b - [ I ]
Here, as shown in FIG. 4. at the middle of the pedal travel, the distance "b" is minimum.
Fw-FyXb/a .. ...........................[ II ]
Thus, as the distance 'b' reduces, Force 'Fw reduces. The maximum pedal effort reduction is achieved at the middle of the travel.
FIG. 6 illustrates the wear travel position of the clutch pedal arrangement. Over the time due to continued usage of the clutch mechanism, the clutch plate (not shown) in gearbox (not shown) starts wearing. Due to this, the clutch cable yoke (6) is pulled in vertically downward direction. The vertically downward movement of the clutch cable yoke (6) below the original position is called wear travel. To accommodate the wear travel, the length of the actuating lever (10) along with sliding surface (12) is increased. As the clutch plate in the gearbox starts wearing, the clutch cable yoke (6) along with pin (7) slides downwards on the sliding surface (12) of the actuating lever (10).
Fig. 7 illustrates second embodiment of the present disclosure. In the second embodiment, all other components of the clutch pedal mechanism remains same as that of the first embodiment except the shape of actuating lever (JO). Instead of open sliding surface, a slotted sliding surface (12) is provided. The clutch cable yoke (6) along with pin (7) is slid in slot provided in actuating lever (10). The reduction of effort achieved by the embodiment of the clutch pedal mechanism (100) is similar to that achieved by the first embodiment.

Advantages
In one embodiment, the clutch pedal mechanism is used for cable operated clutch controls to provide
variable pedal ratio.
In one embodiment, the clutch pedal mechanism for reducing clutch pedal effort using variable pedal ratio.
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 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 "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 phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such 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 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, 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, # and C 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 further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or rflore 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."
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 2nd 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.

We claim:
1. A clutch pedal mechanism (100), comprising:
a control mounting bracket (1) fixed to a vehicle;
a pedal mounting bracket (9) connected below to the control mounting bracket (1);
a clutch pedal lever (3) pivotally connected to the pedal mounting bracket (9): characterized in that,
an actuating lever (10) configured with an extended sliding surface (12) at its free end and connected to the clutch pedal lever (3), wherein the actuating lever (10) is pivotally connected to the pedal mounting bracket (9):
a support bracket (2) mounted to control mounting bracket (1) of the vehicle at predetermined distance from the pedal mounting bracket (9) and
a link (5) comprising plurality of connecting ends (5a) and plurality of arms (5b), wherein the link (5) is connected to the support bracket (2) at one end and to a clutch cable yoke (6) at its other end.
2. The clutch pedal mechanism (100) as claimed in claim 1, wherein the clutch pedal lever (3) and the actuating lever (10) are pivotally fixed to the pedal mounting bracket (9) using a pin (4).
3. The clutch pedal mechanism (100) as claimed in claim 1, wherein the link (5) is of shape selected from group comprising angled link and straight link.
4. The clutch pedal mechanism (100) as claimed in claim 1, wherein the link (5) is pivotally connected to the support bracket (2) and the clutch cable yoke (6) using pins (7, 8) and is slidably mounted onto the extended sliding surface (12) of the actuating lever (10).
5. The clutch pedal mechanism (100) as claimed in claim 1, wherein the actuating lever (10) optionally configured with a slot (12a) to form as the extending sliding surface (12).
6. A method of assembling a clutch pedal mechanism (100), comprising:
mounting a control mounting bracket (1) to a vehicle;
connecting a pedal mounting bracket (9) below the mounted control mounting bracket (1); pivotally connecting a clutch pedal lever (3) to the connected pedal mounting bracket (9);

pivotally connecting an actuating lever (10) to the pivotally connected clutch pedal lever (3) and to pedal mounting bracket (9);
connecting a support bracket (2) to the vehicle at predetermined distance from the pedal mounting bracket (9) and
connecting a link (5) to the support bracket (2) at one end and to a clutch cable yoke (6) at its other end.
7. The method as claimed in claim 6, wherein the clutch pedal lever (3) and the actuating lever (10) are pivotally connected using pin (4).
8. The method as claimed in claim 6, wherein the link (5) pivotally connected to the support bracket (2) and the clutch cable yoke (6) using pins (7 and 8).
9. A clutch pedal mechanism and a method of assembling, is substantially as herein above described and as illustrated in accompanying drawings.