FORM 2
THE PATENT ACT 1970
[39 OF 1970]
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
[See Section 10 and Rule 13]
“PUSH PULL CABLE ADJUSTMENT MECHANISM AND THE METHOD
THEREOF”
Name and Address of the Applicant: TATA MOTORS LIMITED, Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai – 400001, 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 present disclosure relates to the mechanical clutch actuation system of an automobile. The disclosure is focused on the design of the clutch pedal adjustment mechanism on the cable and is provided inside the driver’s cabin.
BACKROUND OF THE DISCLOSURE
In vehicles, which have cable type clutch actuation system, there is an adjustment provided in the cable, which is adjusted manually. This adjustment of the cable is required during initial clutch setting of a vehicle and for compensating for the wear on the clutch plate. Majority of the clutch wear occurs due to irregular clutch settings. This leads to irregular wear on the clutch plate. Proper adjustment of the clutch is also required to ensure smoother gear shifts and to avoid jerking of the vehicle during initial disengagement of the clutch.
The adjustment of the clutch is required whenever the vehicle is running, the clutch disc wears, i.e. the thickness of the clutch disc reduces. Hence, the cable attached to the release lever provided on the gear box gets pulled. The other end of this cable is attached to the clutch pedal within the driver cabin. Hence, the clutch pedal also gets pulled, moving the clutch pedal position. Hence, to maintain the same pedal height, there is a need for cable adjustment mechanism. If this adjustment is not done, it affects the ergonomics leading to driver discomfort.
The clutch adjustment mechanism is currently located on the rear side of the cable on the gearbox. This is packaged inside the engine compartment of the vehicle. Adjustment of the cable becomes difficult during hot condition of the engine after prolonged usage. Also, the engine compartment is a cumbersome area packaged congested with all the components and accessories such as filters, radiators, conditioning systems etc. required for vehicle drive and control. In some cases, the component lying above the cable adjustment area needs to be removed to have an access for adjustment. In case of rear engine vehicle this problem still worsens which would even require removal of rear panels just to get to the adjustment assembly which becomes tedious and time consuming.
The existing clutch cable adjustment system has the following disadvantages. The access to this adjustment mechanism is very less and we cannot achieve the desired precise adjustment of the clutch as it is highly difficult and cumbersome task. Since this adjustment is located in

the engine compartment of the vehicle there are high chances of burn injury and hazards to the persons who is adjusting the cable.
OBJECTS OF THE DISCLOSURE
The objective of the present invention is to provide a cable adjustment mechanism and locking mechanism located at the pedal end.
Another objective of the present invention is to provide fine adjustment to the tension in the cable.
Another objective of the present invention is to provide locking arrangement at the release lever end provided on the gear box end of the vehicle.
SUMMARY OF THE DISCLOSURE
The shortcomings of the prior art are overcome and additional advantages are provided through the provision 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.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, comprising a first hook which is mounted pivotally to one end of a screw rod and the other end of the screw rod is fixed to one end of an inner cable of the push pull cable assembly. A slack adjuster nut is threaded onto one end of the screw rod for adjusting the tension in the push pull cable and the slack adjuster nut is locked in place by means of a locking mechanism. A second hook is fixed onto other end of the inner cable of the push pull cable assembly. A groove is provided on a release lever fixed onto a gear box of the vehicle.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein one end of a screw rod has threads provided on its outer surface.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein the inner cable is connected end to end from first hook to the second hook.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein the first hook and the second hook are clevis hooks provided with clevis pins.

In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein the rubber bellow houses one part of the inner cable and acts as an ingress protection.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein a groove is provided on a release lever to insert the second hook into the groove and holds the second hook within the groove during operation of the release lever.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein the clevis pin is provided on the second hook and is inserted perpendicularly to the lever motion of the release lever.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein the slack adjuster nut is selected from a group comprising serrated nut, serrated tooth nuts, serrated flange nuts and serrated locking nuts.
In an embodiment of the disclosure a push pull cable adjustment mechanism is disclosed, wherein the slack adjuster nut used to adjust the tension in the push pull cable is provided within the vehicle cabin.
In an embodiment of the disclosure a method of providing an adjustment mechanism for a push pull cable assembly is disclosed, comprising steps of, mounting a first hook pivotally to one end of a screw rod and fixing the other end of the screw rod to one end of an inner cable of a push pull cable assembly. Threading a slack adjuster nut to one of the screw rod for adjusting the tension in the push pull cable and locking the slack adjuster nut in place by a locking mechanism and fixing a second hook to the other end of the inner cable of the push pull cable by mounting the second hook to a groove provided on a release lever fixed to the gear box of the vehicle.
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.
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:
Figure 1 shows the complete view of the said cable adjustment mechanism at the pedal end.
Figure 2-A shows the enlarged view of the locking mechanism at pedal end.
Figure 2-B shows the slack adjuster nut and the locking strap for providing finite adjustment and positive locking.
Figure 3 shows release lever with lockable type mechanism.
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 OF DISCLOSURE
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. 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.
Referring now to the drawings wherein the drawings are for the purpose of illustrating a exemplary embodiment of the disclosure only, and not for the purpose of limiting the same.
Figure 1 is an exemplary embodiment of the disclosure and illustrates a push pull cable assembly in detail. The adjustment mechanism for the push pull cable assembly is provided within the drivers cabin. One end of the push pull cable assembly is connected to the pedal end mounting and the other end of the push pull cable assembly is fixed to a release lever provided on the gear box of the engine transmission located in the engine compartment. At the pedal end mounting, a first hook (1) is pivotally mounted onto one end of a screw rod (2) and fixed using a pivot pin (10) and the other end of the screw rod (2) is fixed to one end of an inner cable (3). One end of the screw rod (2) has threads provided on its outer surface. A slack adjuster nut (4) is threaded onto the screw rod (2) which holds the pivotally mounted first hook (1) in place. The slack adjuster nut (4) is used to adjust the tension within the push pull cable to adjust the position of the pedal according to user. The first hook (1) is selected from a group comprising clevis hook, having a clevis hook pin at its end for hooking purpose. The other end of the inner cable (3) is connected to the second hook (5) mounted at the gear box end mounting (12) provided in the engine compartment of the vehicle. The second hook (5) is selected from a group comprising clevis hook having a clevis hook pin (8) at its end for hooking purpose and one part of the inner cable (3) passes through a rubber bellow (9) provided within the engine compartment of the vehicle to connect to the second hook (5). The rubber bellow (9) provided acts as ingress protection preventing the dust and other impurities from jamming the free movement of the cable. The other part of the inner cable (3) passes through the outer cable (13) which also acts as ingress protection, the outer cable (13) passes from inside the vehicle cabin and out to the engine compartment of the vehicle. With the said invention, the cable adjustment would be made from inside the driver cabin thus helping out in regular clutch pedal setting desired by the user. The regular setting of the clutch pedal also helps in increased clutch life. The setting is made easy and can be done on regular basis by the driver himself.
Figure 2A is an exemplary embodiment of the disclosure and illustrates a locking mechanism of the push pull cable assembly. The first hook (1) is pivotally mounted onto one end of the screw rod (2) and fixed in place by a pivot pin (10). The screw rod (2) has threads provided

on its outer surface from the start up to a predetermined length. A slack adjuster nut (4) is threaded onto the screw rod (2) which protrudes out through the pivotally mounted first hook (1). The slack adjuster nut (4) can be used to adjust the pedal position by desired threading of the slack adjuster nut (4). The slack adjuster nut (4) is selected from a group comprising serrated nut, serrated tooth nuts, serrated flange nuts, and serrated locking nut. The slack adjuster nut (4) has serrated tooth provided on its outer surface which acts as a gripper for easy tightening and loosening of the adjuster nut (4). A locking strap is provided which locks the slack adjuster nut (4) in place. The locking strap (14) uses the principle of ratchet and pawl mechanism for locking the slack adjuster nut (4) which is threaded onto the protruded screw rod (2) after the adjustment is done.
Figure 2B is an exemplary embodiment of the disclosure and illustrates a slack adjuster nut (4) and locking strap (14) used to lock the slack adjuster nut (4) in place. The locking strap (14) is used to arrest the positive movement of the slack adjuster nut (4). This adjustment assembly is provided within the driver cabin for easy and timely adjustment of the push pull cable. The adjustment can be done easily by the user and precisely based on his requirement.
Figure 3 is an exemplary embodiment of the disclosure and illustrates a release lever having a lockable type mechanism provided at the gear box end of the vehicle transmission. The second hook (5) selected from a group comprising clevis hook, having a clevis hook pin (8) at its end. A groove (6) is provided on the release lever (7) to house the clevis pin (8) of the second hook (5) and to facilitate movement of the clevis pin (8) within the release lever (7). The clevis pin (8) provided on the second hook (5) is inserted into the groove (6) provided on the release lever (7) in a direction perpendicular to the lever action motion. Once the clevis pin (8) of the second hook (5) is inserted perpendicular to the lever action motion, the clevis pin (8) cannot be removed from the groove (6) unless it is removed perpendicularly to the lever action motion. The shape of the groove (6) provided on the release lever (7) is selected from a group comprising T-slot shape. The shape of the groove (6) facilitates movement of the clevis pin (8) within the groove (6) during operation and gives a degree of tolerance for the tightening and loosening of the slack adjuster nut (4) depending upon the amount of gap provided in the groove (6). The release lever (7) is mounted onto the gear box end of the transmission within the engine compartment of the vehicle.

REFERENCE NUMERALS

1 First Hook
2 Screw Rod
3 Inner Cable
4 Slack Adjuster Nut
5 Second Hook
6 Groove
7 Release lever
8 Clevis Pin
9 Rubber Bellow
10 Pivot pin
11 Pedal end mounting
12 Gear box end mounting
13 Outer cable
14 Locking strap
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, 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 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 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.”

In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.
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.

We Claim:
1. A push pull cable adjusting mechanism comprising;
a first hook (1) connected to a pedal lever is mounted pivotally to one end of a screw rod (2) and, other end of the screw rod (2) is fixed to one end of an inner cable (3) of the push pull cable assembly;
a slack adjuster nut (4) threaded to the one end of the screw rod (2) for adjusting the tension in the push pull cable, wherein, the slack adjuster nut (4) is locked by a locking mechanism, and
a second hook (5) is fixed to other end of the inner cable (3) of the push pull cable assembly wherein, said second hook (5) is connected to a groove (6) provided on a release lever (7) fixed onto a gear box of the vehicle.
2. The push pull cable adjusting mechanism as claimed in claim 1, wherein one end of a screw rod (2) has threads provided on its outer surface.
3. The push pull cable adjusting mechanism as claimed in claim 1, wherein the inner cable (3) is connected end to end from first hook (1) to the second hook (5).
4. The push pull cable adjusting mechanism as claimed in claim 1, wherein the first hook (1) and the second hook (5) are clevis hooks provided with clevis pins (8).
5. The push pull cable adjusting mechanism as claimed in claim 1, wherein the rubber bellow (9) houses one part of the inner cable (3) and acts as an ingress protection.
6. The push pull cable adjusting mechanism as claimed in claim 1, wherein a groove (6) is provided on a release lever (7) to insert the second hook (5) into the groove (6) and holds the second hook (5) within the groove (6) during operation of the release lever (7).
7. The push pull cable adjusting mechanism as claimed in claim 4, wherein the clevis pin (8) provided on the second hook (5) is inserted perpendicular to lever motion of the release lever (7).

8. The push pull cable adjusting mechanism as claimed in claim 1, wherein the slack adjuster nut (4) is selected from a group comprising serrated nut, serrated tooth nuts, serrated flange nuts, and serrated locking nut.
9. The push pull cable adjusting mechanism as claimed in claim 1, wherein the slack adjuster nut (4) to adjust the tension in the push pull cable is provided within the vehicle cabin.
10. A method of providing an adjustment mechanism for a push pull cable assembly comprising steps of;
mounting a first hook (1) pivotally to one end of a screw rod (2), and fixing
the other end of the screw rod (2) to one end of an inner cable (3) of a push
pull cable assembly;
threading a slack adjuster nut (4) to one end of the screw rod (2) for adjusting
the tension in the push pull cable and locking the slack adjuster nut (4) in
place by a locking mechanism;
fixing a second hook (5) to the other end of the inner cable (3) of the push pull
cable;
mounting the second hook (5) to a groove (6) provided on a release lever (7)
fixed to the gear box of the vehicle.
11. The method of providing an adjustment mechanism for a push pull cable assembly as
claimed in claim 10, wherein a first hook (1) and second hook (5) are clevis hooks
provided with clevis pins (8).