FORM 2
THE PATENT ACT 1970 (as amended)
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
TITLE: "A CABLE OPERATED CLUTCH PEDAL ASSEMBLY OF A VEHICLE"
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.

TECHINCAL FIELD
Embodiments of the present disclosure relates to a clutch pedal assembly of a vehicle. More particularly, embodiments relates to- a cable operated clutch pedal assembly of the vehicle.
BACKGROUND OF DISCLOSURE
In vehicles which have cable operated clutch actuation systems, there is no adjustment provided to compensate for the wear of the clutch plate. When the clutch wears, the thickness of the clutch plate reduces. Hence, the cable attached to the release lever is getting pulled. Since other end of this cable is attached to the clutch pedal, the clutch pedal is also getting pulled resulting in moving the clutch pedal upward. Thus, the initial position of the clutch pedal is changed. If the initial position of the pedal is changed, there is a need for cable adjustment to be done on the existing pedal to maintain the pedal height in the vehicle with respect to brake pedal for proper and easy actuation. If this adjustment is not done it effects from the ergonomics point of view leading to driver's discomfort.
FIG. 1 illustrates a conventional cable operated clutch actuation assembly. The assembly comprises a stamped clutch pedal which is pivoted on pedal bracket by means of pedal pivot pin. The opposite end of the pedal is stamped in the form of a hook for pivoting the inner cable end. The inner cable is free to slide in the outer cable. One end of the outer cable is fastened to the fire wall of the vehicle. Other ends of the inner and outer cable are connected to the clutch actuation system on the clutch housing respectively at the engine side.
A method of operating a conventional cable operated clutch pedal assembly for disengaging the clutch comprises fallowing steps: a clutch pedal is pushed in downward direction by means of foot. Due to this movement the pedal which is pivoted by means of pivot pin moves in clockwise direction, there by pulling the cable end. This in turn helps in disengaging the clutch and on the release of the pedal (1) the clutch engages.

Further, to reduce effort applied on the clutch pedal, vehicles are incorporated with a pedal assistance spring onto the pedal. This type of assistance is possible only in hydraulic type actuation system and is not available on any existing mechanical actuation system. This is because of the flexibility of hydraulic system which makes the pedal to stay in its initial position even though the clutch wears out. This is done at the slave cylinder by self adjusting the stroke and spilling oil into or out of reservoir, because of this the peak effort and peak assistance provided by the assistance spring does not get shifted and they stay almost align through the life of the vehicle and clutch, thus helping to reduce the pedal effort and improve the feel. But the disadvantages of hydraulic system is that the system is costly and any leakage in the system would completely make the system non workable.
In addition, the cable operated clutch actuation assembly does not help in self adjusting during clutch wear. Thus there will be a frequent change in the pedal position over a period of time and the pedal cannot be assured for its initial position. This system need to be frequently adjusted. The system if equipped with assistance spring the resultant would be that the effort and assistance peak would frequently get shifted, which therefore would affect the pedal effort and feel.
In light of forgoing discussion, there is a need to provide a cable operated clutch pedal assembly which is having wear compensation adjustment mechanism and a pedal assistance mechanism.
STATEMENT OF THE DISCLOSURE
Accordingly, the present disclosure provides a cable operated clutch pedal assembly (200) of a vehicle, said assembly comprising: a pedal bracket (202) of predetermined shape mounted on fire wall (209) of the vehicle, said bracket (202) is configured to form base of the pedal assembly (200); a clutch pedal (201) pivoted at a predetermined location of the pedal bracket (202), said clutch pedal (201) comprises a foot rest (201a) at its one end and plurality of teeth (201b) at its other end; a shaft (206) pivoted to the pedal bracket (202), such that pivoting axis of the shaft (206) is adjacent to a pivoting axis of the clutch pedal (201), said shaft (206) facilitates mounting of drum

(2D5) on its outer circumference; an inner cable (207) connected to the drum (205) through a hole (205a) at its one end; a torsion spring (210) mounted concentric to the shaft (206) with one end of it fixed at hole (202a) of the pedal bracket (202) and the other end of it is fixed at the hole (205a) of the drum (205), said torsion spring (210) is connected to the inner cable (207) for maintaining uniform tension on the inner cable (207); and a gear (204) mounted to the shaft (206) below the drum (205).
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of an assembly and methods as claimed in 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.
One embodiment of the present disclosure provides a cable operated clutch pedal assembly (200) of a vehicle. The assembly comprises a pedal bracket (202) of predetermined shape mounted on fire wall (209) of the vehicle. Said bracket (202) is configured to form base of the pedal assembly (200). A clutch pedal (201) is pivoted at predetermined location of the pedal bracket (202) and said clutch pedal (201) comprises a foot rest (201a) at its one end and plurality of teeth (201b) at its other end. Further, a shaft
(206) is pivoted to the pedal bracket (202), such that pivoting axis of the shaft (206) is adjacent to a pivoting axis of the clutch pedal (201). Said shaft (206) facilitates mounting of drum (205) on its outer circumference. And an inner cable (207) connected to the drum (205) through a hole (205a) at its one end. A torsion spring (210) mounted concentric to the shaft (206) with one end of it fixed at hole (202a) of the pedal bracket (202) and the other end of it is fixed at the hole (205a) of the drum (205), said torsion spring (210) is connected to the inner cable (207) for maintaining uniform tension on the inner cable
(207) and a gear (204) mounted to the shaft (206) below the drum (205).

In one embodiment of the present disclosure, the teeth (201b) of the clutch pedal (201),and the gear (204) are mounted proximal to-each other, said teeth (201b) mesh with the gear (204) for a predetermined travel of the pedal (201).
In one embodiment of the present disclosure, a U-shaped locking groove (205b) is provided in outer circumference of the drum (205) for locking the inner cable (207) end and winding around the drum (205).
In one embodiment of the present disclosure, an outer cable (208) is provided coaxially to the inner cable (207), wherein said outer cabte (208) is joined to the fire wall (209) of the pedal bracket (202).
In one embodiment of the present disclosure, a pedal assistance mechanism (211) is pivoted to clutch pedal (201) at its one end and its other end is pivoted to the pedal bracket (202).
In one embodiment of the present disclosure, assistance for pressing and retracting the clutch pedal (201) is obtained from the pedal assistance mechanism (211) during initial forward and final return travel of the pedal.
In one embodiment of the present disclosure, a stopper (212) is joined at the end of pedal bracket (202) for maintaining the clutch pedal (201) in its initial position.
In one embodiment of the present disclosure, the clutch pedal (201), shaft (206) and pedal actuation mechanism (211) are pivoted by a means selected from at least one of pins, rivets, nuts and bolts or any other fastener which serve the purpose.
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

OBJECTS OF THE DISCLOSURE
One object of the present disclosure is to provide a cable operated clutch pedal assembly having wear compensation adjustment mechanism, so that the initial pedal position remains same in spite of clutch wear.
One object of the present disclosure is to provide a cable operated clutch pedal assembly having a pedal assistance mechanism.
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
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 illustrates a side view of conventional cable operated clutch pedal assembly.
FIG. 2 illustrates a side view of the cable operated clutch pedal assembly of the present disclosure.
FIG. 3 illustrates an enlarged view of drum, gear of the clutch pedal assembly.
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
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.
To overcome the drawbacks mentioned in the background an improved cable operated clutch pedal assembly is provided. The assembly comprises a wear compensation adjustment mechanism in which initial pedal position remains same in spite of clutch wear. Further, the pedal assistance mechanism is provided in the assembly which provides assistance for actuating the clutch pedal.
FIG. 2 is an exemplary embodiment which illustrates a side view of the cable operated clutch pedal assembly (200) of the present disclosure. The main components of the assembly are pedal bracket (201), clutch pedal (201), a wear compensation mechanism and cables (207 and 208).
The pedal bracket (202) of a predetermined shape is mounted on the fire wall of a vehicle. Said pedal bracket (202) is configured to form a base of the clutch pedal assembly (200). The clutch pedal (201) is mounted on the pedal bracket (202) by means

of pivot pin (203). In one embodiment the clutch pedal (201) can also be pivoted by means selected from group but not limited to rivets, nuts and bolts or any other fastener which serve the purpose. Said clutch pedal (202) comprises a foot rest (201a) at its one end for applying the foot pressure to actuate the clutch pedal (201). And plurality of teeth (201a) is stamped at the other end of the clutch pedal (201). In one embodiment a shaft
(206) is pivoted to the pedal bracket (202) such that a pivoting axis of the shaft (206) is
adjacent to the pivoting axis of the clutch pedal (201). In one embodiment of the present
disclosure, one or more teeth's (201b) are formed in the end of the clutch pedal (201) by
a process selected from group but not limited to stamping, milling or any process which
serve the purpose.
FIG. 3 illustrates the wear compensation mechanism of the clutch pedal assembly (200) includes a gear (204) which is mounted on a shaft (206) and is integrated with a drum (205) which can both rotate freely onto a shaft (206) when the clutch pedal (201) is in disengaged condition. The drum (205) has a U-shaped groove (205b). on which the inner cable (207) is hooked. The drum (205) winds up inner cable
(207) around it during clutch pedal (1) movement. The outer cable (208) is provided
coaxially to the inner cable (207) and one end of the outer cable (208) is joined to a fire
wall (209) of the pedal bracket (202). The other ends of inner and outer cables (207 and
208) are connected to a clutch actuation mechanism for engaging and disengaging the
clutch.
Further, a torsion spring (210) is mounted concentric to the drum shaft (206) with one end of it fixed in a hole (202a) drilled in the pedal bracket (202) and the other end is fixed in the hole (205a) drilled on drum (205). The torsion spring (210) is preloaded by turning the drum (205) in clockwise direction manually and connected to inner cable (207). When the drum (205) is released it tries to rotate in anticlockwise direction there by preloading the inner cable (207). This in turn preloads the clutch cover assembly in the clutch housing.
In one embodiment of the present disclosure, the teeth (201a) and gear (205) will not mesh in initial position of the clutch pedal (201) (i.e. when the clutch is in

engaged condition). On moving the clutch pedal (201) by 10 mm from its initial position the teeth (201a) and gear (205) mesh each other.
A pedal assistance mechanism (211) is pivoted to the pedal bracket (202) and the clutch pedal (201) at predetermined locations for providing assistance for pressing and retracting of the clutch pedal (201). The pedal assistance mechanism (211) includes a rod on which one rigid member is joined at the top side. And one more rigid member which is capable of sliding on the said rod is provided at its bottom side. In between the rigid members a compression spring is provided. In one embodiment, the compression spring retracts and expands at predetermined locations for providing pedal assistance. The pedal assistance mechanism (211) provides assistance for pressing the clutch pedal (201) when the clutch pedal is pressed above a predetermined limit. Further, the pedal assistance mechanism (211) provides assistance for retracting the clutch pedal (201) to its initial position when the teeth (201a) un-meshes with the gear (204). The clutch pedal (201), the shaft (206) and the pedal assistance mechanism (211) are pivoted by the means selected from a group but not limited to pivot pins, rivets, nuts and bolts or any other fastener which serve the purpose.
A stopper (212) is joined at the end of pedal bracket (202) for maintaining the clutch pedal (201) in its initial position. The pedal assistance mechanism (211) pushes the clutch pedal (201) against the stopper (212) for maintaining the clutch pedal in its initial position.
In one embodiment of the present disclosure, the cable operated clutch pedal assembly (200) can be used in different vehicles by varying the dimensions of drum and gear and by shifting the shaft.
Working of the cable operated clutch pedal assembly:
During disengagement of the clutch:
A clutch pedal (201) is pushed by applying force on the pedal rest (201a) by means of foot. The clutch pedal (201) along with the teeth (201b) rotates around pivot (203). The rotation of the teeth (201b) is in the clockwise direction. The teeth (201b)

will not mesh with the gear (204) in the initial position of the clutch pedal (201) they only mesh when clutch pedal (201) travels-for 10mm distance. The teeth (201a) drives a gear (204) in an anti-clockwise direction. The gear (204) drives a drum (205) in an anti-clockwise direction as well. The inner cable (207) mounted on the drum begins to wind around the drum (205). This pulls the inner cable (207) in an upward direction. The inner cable (207) is attached to the release lever of the clutch actuation which is connected to the clutch assembly for disengaging the clutch.
During engagement of the clutch,
In this condition firstly, foot pressure on the clutch pedal (201) is released i.e. return stroke. Then inner cable (201) rotates the drum (205) in clockwise direction by releasing a tension force on the cable (207). The drum (205) inturn rotates the gear (204) in clockwise direction. Since the gear (204) and the teeth (201a) are meshed, the teeth (201a) move in anti clockwise direction and hence the clutch pedal (201) also moves in the anticlockwise direction to bring it back to its original position.
Wear compensation,
When the clutch plate is worn out, the cable (207) gets pulled in downward direction. This causes the drum (205) as well as the gear (204) to rotate in a clockwise direction and inner cable (207) gets adjusted. When the clutch pedal (201) is in its initial position the gear (204) and the teeth (201b) are not meshed together. Hence, the pedal (201) initial position is not affected. Thus, the pedal (201) maintains the same position it did when the clutch plate was new. Therefore, adjustment for compensating the wear of the clutch plate is achieved.
Pedal assistance:
Since the clutch pedal (201) position is not changed during clutch plate wear an assistance mechanism (211) is provided for assistance of the clutch pedal (201).
The pedal assistance mechanism (211) fitted on clutch pedal assembly (200) works in the following way. The initial position of clutch pedal (201) remains same because of the pedal assistance mechanism (211) pushing it against the stopper (212)

and this position is called Initial Position (IP). The next position is Toggle position of pedal (TP), from IP to TP the clutch pedal (201) movement because force applied on the clutch pedal (201). The pedal assistance mechanism (211) provides assistance for . pressing the clutch pedal from the Toggle position of the pedal to a final position, due to the assistance provided by the pedal assistance mechanism (211) the clutch pedal (201) effort is reduced. Thus the clutch pedal (1) actuation effort is reduced on a cable type mechanical actuated clutch pedal (201).
Advantages:
The present disclosure provides a cable operated clutch pedal assembly which is economical and consumes less time for assembly.
The present disclosure provides a cable operated clutch pedal assembly in which the initial position of clutch pedal will not vary throughout life of the vehicle, which reduces maintenance time of the clutch pedal assembly.
The present disclosure provides a cable operated clutch pedal assembly in which the pedal assistance is provided by the pedal assistance mechanism, this provides more comfort to the driver.
Industrial applicability:
The disclosed clutch pedal assembly finds potential application in automobiles. The disclosed assembly finds particular application in vehicles using a cable operated clutch actuation system. One skilled in the art will recognize, however, that the disclosed assembly can be used in different vehicles having cable operated clutch actuation assembly by varying dimensions of drum, gear and the position of the shaft.
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 wiJJ 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, B 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 genera] 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 more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Referral Numerals:

Reference Number Description
200 Cable operated clutch pedal assembly
201 Clutch pedal
201a Foot rest
201b Teeth on end of the clutch pfedal
202 Pedal bracket
202a Hole drilled on pedal bracket
203 Pivot means
204 Gear .
205 Drum
205a Hole drilled on drum
205b U-shaped groove
206 Shaft
207 Inner cable

208 Outer cable
209 Fire wall
210 Torsion spring
211 Pedal assistance mechanism
212 Stopper
IP Initial Position
TP Toggle Position of peddle
FP Final Position

We claim:
1. A cable operated clutch pedal assembly (200) of a vehicle, said assembly
comprising:
a pedal bracket (202) of predetermined shape mounted on fire wall (209) of the vehicle, said bracket (202) is configured to form base of the pedal assembly (200);
a clutch pedal (201) pivoted at a predetermined location of the pedal bracket (202), said clutch pedal (201) comprises a foot rest (201a) at its one end and plurality of teeth (201b) at its other end;
a shaft (206) pivoted to the pedal bracket (202), such that pivoting axis of the shaft (206) is adjacent to a pivoting axis of the clutch pedal (201), said shaft (206) facilitates mounting of drum (205) on its outer circumference;
an inner clutch cable (207) connected to the drum (205) through a hole (205a) at its one end;
a torsion spring (210) mounted concentric to the shaft (206) with one end of it fixed at hole (202a) of the pedal bracket (202) and the other end of it is fixed at the hole (205a) of the drum (205) for maintaining uniform tension on the inner cable (207); and
a gear (204) attached to the drum (205).
2. The pedal assembly as claimed in claim 1, wherein the teeth (201b) of the clutch pedal (201) and the gear (204) are mounted proximal to each other, said teeth (201b) mesh with the gear (204) for a predetermined travel of the pedal (201).
3. The pedal assembly as claimed in claim 1, wherein a U-shaped locking groove (205b) is provided in outer circumference of the drum (205) for locking the inner cable (207) end and winding around the drum (205),
4. The pedal assembly as claimed in claim 1, wherein an outer cable (208) is provided coaxially to the inner cable (207). wherein said outer cable (208) is joined to the fire wall (209) of the pedal bracket (202).

5. The pedal assembly as claimed in claim 1, wherein a pedal assistance mechanism (211) is pivoted to clutch pedal (201) at its one end and its other end is pivoted to the pedal bracket (202).
6. The pedal assembly as claimed in claim 1 and 5, wherein assistance for pressing and retracting the clutch pedal (201) is obtained from the pedal assistance mechanism (211) during initial forward and final return travel of the pedal.
7. The pedal assembly as claimed in claim 1, wherein a stopper (212) is joined at the end of pedal bracket (202) for maintaining the clutch pedal (201) in its initial position.
8. The pedal assembly as claimed in claim 1, wherein the clutch pedal (201), shaft (206) and pedal actuation mechanism (211) are pivoted by a means selected from at least one of pins, rivets, nuts and bolts or any other fastener which serve the purpose.
9. A vehicle comprising a cable operated clutch pedal assembly (200) as claimed in claim 1.
10. A cable operated clutch pedal assembly (200) of a vehicle is substantially as herein above described and as illustrated in accompanying drawings.