TECHNICAL FIELD
[0001] The present subject matter relates generally to automotive vehicles, and more particularly, but not exclusively, to a shock absorber for the automotive vehicles.
BACKGROUND
[0002] Generally, a frame assembly acts as a structural member of the vehicle. Especially, the frame assembly acts as a load-bearing member of the vehicle. Generally, in a two-wheeled vehicle, a front portion of the frame assembly is connected to a front wheel through one or more front suspension(s). The frame assembly extends rearward of the vehicle, where a rear wheel is connected to a frame assembly through one or more rear suspension(s). Generally, in a saddle-ride type vehicle, the frame assembly is such that an internal combustion (IC) engine is positioned in the forward direction of the vehicle. The IC engine is positioned in a manner such that the cylinder head is either vertical or inclined forwardly. Typically, in the saddle-ride type vehicle, a fuel tank assembly is mounted to the frame assembly above the IC engine and an air intake system is disposed below a seat assembly, where the seat assembly is positioned in a posterior to the fuel tank.
[0003] The internal combustion (IC) engine comprises of an air intake system, which supplies air required for operation of the IC engine. Air drawn is mixed with fuel at a desired ratio and combusted in the IC engine. A carburetor system or the like is used for supplying air-fuel mixture to the IC engine. Desired power or torque generated by the IC engine is transferred to the rear wheel. The vehicle is started using a kick-start mechanism or an electrical start mechanism.
BRIEF DESCRIPTION OF THE DRAWINGS [0004] The detailed description of the present subject matter is described with reference to the accompanying figures. Same numbers are used throughout the drawings to reference like features and components.

[0005] Fig. 1 illustrates a right side perspective view of a saddle-ride type
vehicle as an example, in accordance with an embodiment of the present subject
matter.
[0006] Fig. 2 (a) illustrates a shock absorber, in accordance with an
embodiment of the present subject matter.
[0007] Fig. 2 (b) illustrates an enlarged view of the shock absorber depicted
in Fig. 2 (a).
[0008] Fig. 2 (c) depicts a cross-sectional view of the shock absorber in
accordance with the embodiment depicted in Fig. 2 (a).
[0009] Fig. 2 (d) depicts a preload adjuster tool, in accordance with an
embodiment of the present subject matter.
[00010] Fig. 2 (e) depicts an adjuster tool working with a shock absorber.
[00011] Fig. 2 (f) depicts an enlarged view of the embodiment depicted in
Fig. 2(e).
[00012] Fig. 3 (a) depicts an adjuster tool, in accordance with another
embodiment of the present subject matter.
[00013] Fig. 3 (b) depicts the adjuster tool working with the shock absorber,
in accordance with the embodiment depicted in Fig. 3 (a).
[00014] Fig. 4 depicts an adjuster tool, in accordance with yet another
embodiment of the present subject matter.
DETAILED DESCRIPTION
[00015] Typically, in a saddle-ride type vehicle, the frame assembly is such that a head tube is positioned in the anterior portion and the frame assembly extends rearwards from the head tube. One or more front shock absorber(s) connect the front wheel to a steering shaft at one end and another end of the steering shaft is connected to a handle bar assembly. The steering shaft rotatably disposed through the head tube. One or more rear shock absorber(s) connect the rear wheel to the frame assembly. Further, various vehicle parts are mounted to the vehicle, which include an engine assembly, a seat assembly, a fuel tank assembly, air induction system, exhaust system and plurality of body panels.

[00016] Generally, the shock absorber is used to reduce the external shocks and vibrations sourced from road from reaching the vehicle body. The shock absorbers dampen the forces acting on the wheels from reaching the frame assembly of the vehicle. Further, the shock absorber is made to withstand shock, impact, torsion, and clamping loads. In case of a vehicle with mono-shock suspension design, a single shock absorber is provided that connects the swing arm to the frame assembly of the vehicle. Further, in the mono-shock suspension system, the shock absorber is mounted at an angle to sustain both the radial and axial forces acting due to the rear wheel reaction to varying road conditions. [00017] Upon repetitive usage, with varying road conditions, with variation in payload, or with change in driving style, the shock absorbers require adjustment. The shock absorber systems of the vehicle are made to be adjustable by the user or by a mechanic. Generally, the shock absorber comprises of an
r
elastic element with a pre-load adjustment, which is adjustable in accordance with aforementioned varying conditions or according to requirement of the user. This varies the stiffness or damping characteristics of the elastic element. Generally, a spring-is used as the elastic element.
[00018] However, adjustment of the elasticity of the sprig with tool(s) known in the art makes it difficult to operate due to the space constraint locations of vehicle. Typically, in a saddle-ride type vehicle, multiple body panels have to be removed to access the suspension for adjustment. For example, in the vehicle with mono-shock absorber provided in the rear, due to presence of various components like rear wheel, battery, air filter assembly below the seat assembly, it is difficult for accessing the shock absorber for adjustment. Therefore, it becomes a time consuming and tedious task for adjusting the shock absorber. Adjustment of suspension at the In addition, adjustment of the rear mono-shock absorber requires higher torque, which is complex and requires more space for operating the tool(s) known in the art. Thus, there is a need for providing a preload adjustment system for shock absorbers that addresses the previously mentioned problems including the problem of ease of use and providing ease of access.

[00019] Hence, it is an objective of the present subject matter is to address the aforementioned and other problems in the prior art. The present subject matter provides a shock absorber and an adjuster tool to work with the shock absorber. The shock absorber is provided with one or more provisions for receiving the adjuster tool. Further, the adjuster tool comprises a base member provided with a first projection that is capable of rotatably engaging with the provisions of the shock absorber.
[00020] Furthermore, at least one second projection disposed on the base and the second projection is disposed substantially transversely to an axial direction of the base member. The second projection is capable of engaging with slots provided on an adjustable spring seat provided on the shock absorber. A head member.provided on other adjuster tool enables rotation of the adjuster tool about the axis thereby enabling adjustment of the adjustable spring seat in axial direction of the shock absorber.
[00021] According to one aspect of the present subject matter, the adjuster tool enables adjustment of pre-load of the shock absorber with minimal torque.
[00022] According another aspect, the adjuster tool enables adjustment of the pre-load of the shock absorber in compact area of the vehicle.
[00023] It is an additional aspect, the present subject matter requires change in external construction of shock absorber, and the functional aspect of the shock absorber is not affected.
[00024] It is a feature of the present subject matter that the adjuster tool is compact and can be accommodated in the vehicle.
[00025] It is an advantage of the present subject matter that the adjuster tool is easy to use.
[00026] It is another advantage of the present subject matter that the maintenance time is reduced.
[00027] In an embodiment, the shock absorber comprises a damper having a cylinder and a piston rod that is slidably supported by the cylinder therein. At

least one spring is disposed coaxially around the damper. The shock absorber further comprises a fixed spring seat and the adjustable spring seat to hold the spring. The fixed spring seat is affixed to the piston rod. An adjustable spring seat is slidably disposed about the cylinder. One or more stopper pin(s) is provided on ■ the cylinder for restricting axial movement of the adjustable spring seat to enable motion of the adjustable spring seat in one direction only. Further, the cylinder comprises one or more receiving member(s) to receive the adjuster tool.
. [00028] In an embodiment, a first end of the shock absorber comprises a first connecting portion member coupled with a first bushing member, which enables I connection of the shock absorber to the frame assembly of the vehicle. A second end of the shock absorber comprises a second connecting member coupled with a second bushing member, which enables connection of the shock absorber with the swing arm.
[00029] . The damper is provided with oil and/or gases restrict the sliding i motion of the piston in the cylinder that enables damping of the forces acting on the shock absorber. At least one spring restricts the motion of the spring and also enables in bringing the piston to original state. The damper, and the oil and/or gases filled in the. damper enable dampening of forces. Further, the adjustable spring seat comprises plurality of slots that are disposed radially. In other words,
► the adjustable spring seat is provided with plurality of slots that are
circumferentially disposed. Furthermore, the adjustable spring seat comprises
plurality of contact points. The plurality of contact points enable selective
adjustment of the adjustable spring seat thereby preload of the at least one spring
is adjusted.
i [00030] In an embodiment, the shock absorber comprising one or more receiving member(s) capable of receiving an adjuster tool. The adjuster tool comprises a first projection that is axially disposed. At least one second projection disposed transversely to a rotational axis on the base member. The head member enables holding of the adjuster tool. The first projection is capable
> of rotatably engaging with each of the one or more receiving member(s) of the

shock absorber. The at least one second projection enables rotation of the adjustable spring seat.
[00031] In an embodiment, the.second projection of the adjuster means is capable of engaging with any one slot of the plurality slots of the adjustable spring seat. The head member enables holding of the adjuster tool by the user thereby enabling application of torque for rotation of the adjuster, tool either in clockwise or anti-clockwise direction. The rotation of the adjuster tool in clockwise or anti-clockwise direction enables rotation of the adjustable spring ' seat from right to left or left to right respectively.
[00032] The adjuster tool enables adjustment of preload of the spring by rotation of the adjuster tool with respect to a single axis i.e., in a clockwise or an anti-clockwise direction. The rotation of adjuster tool with respect to a single axis requires less space thereby enabling easy adjustment in compact areas of the vehicle.
[00033] Moreover, the present subject matter is applicable to three-wheeled vehicle for preload adjustment of the shock absorbers provided thereon. This enables the ease of access and use for adjustment of the shock absorber as the location of shock absorbers is compact and requires less operating space.
[00034] The aforesaid and other advantages of the present subject matter would be described in greater detail in conjunction with the figures in the following description.
[00035] Fig. 1 illustrates a right side view of a saddle-ride type vehicle as an example, in accordance with an embodiment of present subject matter. The saddle-ride type motorcycle 100 is provided with a rear mono-shock suspension 200, which is the rear shock absorber. Further, the vehicle 100 has a frame assembly 105, which acts as the skeleton and load bearing member for the vehicle 100. The frame assembly 105 includes a head tube 105A, a main tube (not shown), and a down tube (not shown). The main tube extends rearward from the head tube and the down tube extends downwards from the head tube. A first

portion of the main tube extends obliquely downwards towards a pivotal point 110 and^ a second portion of the main tube comprises one or more rail(s) (not shown) running towards the rear of the vehicle 100. A swing arm 115 is swingably connected to the pivotal point 110. A rear wheel 120 is rotatably supported by the swing arm 115 at an end portion away from the pivotal portion. A rear fender 125 is positioned above the rear wheel 120. The rear shock absorber 200 is connecting the swing arm at an angle to the frame assembly, to sustain both the radial and axial forces occurring due to wheel reaction. A seat assembly 130 is mounted to the one or more rail(s). A fuel tank 135 is disposed at an anterior portion of the seat assembly 130.
[00036] The vehicle further comprises an engine assembly 140, which is the power unit of the vehicle, which is mounted in an anterior portion of the frame assembly 105. The engine assembly 140 includes an internal combustion (IC) engine, a starting mechanism, a transmission system for transferring the power to the rear wheel 120, and an air-fuel supply mechanism for the IC engine including a carburetor or the like and an exhaust mechanism. A steering assembly 145 includes a handle bar assembly 145A, one or more front forks 145B, and a front wheel 145C. The steering assembly 145 is pivotal about the head tube 105A. A front fender 150 coyers at least a portion of the front wheel 145C. The handle bar assembly 145A includes a handle bar, an instrument cluster, handle grips and one or more levers. The vehicle has various electrical loads including a head lamp 155, a tail lamp 160, and a starter motor (not shown). Plurality of body panels 165A, 165B are mounted to the frame assembly 105.
[00037] Fig. 2 (a) illustrates a shock absorber 200, in accordance with an embodiment of the present subject matter. Fig. 2 (b) illustrates an enlarged view of the shock absorber depicted in Fig. 2 (a) and Fig. 2 (c) illustrates cross-sectional view of the shock absorber 200 taken along axis X-X' of the embodiment depicted in Fig. 2 (a). The shock absorber 200 comprises a damper formed by a cylinder 205 and a piston rod 210. In a preferred embodiment, the cylinder 205 and the piston rod 210 are cylindrical. At least a portion of the

piston rod 210 is capable of moving within the cylinder 205. At least one spring 215 is disposed coaxially around the cylinder 205 and the piston rod 210. In the present embodiment, a single spring is used. The piston rod 210 is mounted with a fixed spring seat 220 affixed to the piston rod 210. An adjustable spring seat 225 is slidably disposed about the cylinder 205. The spring 215 is confined between the fixed spring seat 220 and the adjustable spring seat 225. Furthermore, the cylinder 205 is filled with oil 265 and/or gases that act as damping fluids. During suspension, the oil 265 and/or gases receive the forces acting on the absorber that occurs during compression. The spring 215 enables restoration of the position of the piston 210 by expansion. Further, a bump stopper 270 is disposed on the piston to restrict the motion of the piston 210. The bump stopper 270 is made of an elastic material.
[00038] The shock absorber 200 comprises a fixed spring seat pin 230A and a adjustable spring seat pin 230B that are provided on the cylinder 205 for restricting movement of the adjustable spring seat 225 in a first direction, which is in the axial direction U of the shock absorber 200. In addition, the motion of the adjustable spring seat 225 in the other axial direction is restricted by the spring 215. In another embodiment, one or more stopper pin(s) 230A, 230B may be used. The at least one spring 2i5 is capable of compressing and expanding, relative to the forces acting on the damper, that is occurred by the motion of the piston rod 210 within the cylinder 205. Further, the cylinder 205 comprises one or more receiving member(s) 235A, 235B, wherein the receiving member(s) 235A, 235B are provided on an outer circumference of the cylinder 205. In a preferred embodiment, a first receiving member 235A and a second receiving member 235B are provided that are formed in the form a cylindrical hole. In another embodiment, the receiving members 235A, 235B are integrally formed with the cylinder 205.
[00039] The cross-section of the shock absorber 200 along axis X-X' depicts a portion at least a portion of the piston rod 210 positioned into the cylinder 205, which forms a damper. The first end of the shock absorber 200 comprises the first

connecting portion 245 coupled with a first bushing member 255, which enables . connection of the shock absorber 200 to the swing arm 115 of the vehicle 100. The first connecting portion 245 is fastened to the swing arm by a nut-bolt or the like. A second end of the shock absorber 200 comprises a second connecting portion 250 coupled with a second bushing member 260, which enables connection of the shock absorber 200 with the frame assembly 105. The second connecting portion 250 is fastened to the frame assembly 105 by nut-bolt or the like. Further, in one embodiment, the second connecting portion 245 is secured to the shock absorber 200 through fasteners 240. In another embodiment, the second connecting portion is integrally formed with the shock absorber 200. The damper is provided with oil and/or gases. The first bushing member 255 and the second bushing member 260 are made of elastic material. For example, rubber or bearing bushings or the like may be used. The at least one spring 215, and the oil and/or gases enable dampening of the movement of the piston rod 210 that is relative to the forces acting on the vehicle 100.
[00040] Further, the adjustable spring seat 225 is selectively adjustable along the axis of the cylinder 205. Further, the adjustable spring seat 225 comprises plurality of contact points 225B that are abutting against the stopper pin(s) 230A, 230B. In a preferred embodiment, the contact points 225B are helically disposed along the circumference of the adjustable spring seat 225. The plurality of contact points 225B enable selective adjustment of the adjustable spring seat 225, which in turn enables compression and expansion of the at least one spring 215. With varying point of contact on the contacting portion 225B, the position of the adjustable spring seat 225 in axial direction varies thereby resulting in compression or expansion of the spring 215. The one or more receiving member(s) 235A, 235B enable receiving of an adjuster tool 300. The adjustable spring seat 225 enables adjustment of preload acting on the at least one spring 215.

[00041] Further, the adjustable spring seat 225 comprises plurality of slots 225A that are annularly disposed on the adjustable spring seat 225 and are capable of engaging with the adjuster tool 300.
[00042] Fig. 2 (d) depicts an adjuster tool 300, in accordance with an embodiment of the present subject matter. The adjuster tool 300 is adapted to work with the shock absorber 200. The adjuster tool 300 comprises a base member 310 with a first end and a second end. The base member 310 is provided with a first projection 320 on the first end and that is extending in the axial direction, which is the rotational axis A-A\ In an embodiment, the first projection 320 is integrally formed with the based member 310. The first projection 320 extends in an axial direction from the first end of base member 310. In a preferred embodiment, the first projection 320 is of cylindrical shape. At least one second projection 330 is formed on the base member 310, and the at least one second projection 330 is disposed transversely on the base member 310. In a preferred embodiment, the second projection 330 is cylindrical and is integrally formed with the base member 310. However, the second projection 330 can have any geometric shape. A head member 340 provided on the second end of the base member 310 such that the head member 340 acts as a handle for holding of the adjuster tool 300 by user. The head member 340 acts as a handle for the adjuster tool 300. The first projection 320 is adapted to engage with each of the one or more receiving member(s) 235A, 235B of the shock absorber 200. The adjuster tool 300 is rotatable about the rotational axis A-A', which requires less space for rotation. The at least one second projection 330 is capable of engaging with each of the plurality of slots 225A provided on the adjustable . spring seat 225.
[00043] Fig. 2 (e) depicts an adjuster tool 300 working with a shock absorber 200, in accordance with an embodiment of the present subject matter. Fig. 2 (e) depicts adjustment of preload of the shock absorber 200. The shock absorber 200 comprises a first receiving member 235A and a second receiving member 235B, which are cylindrical holes. Each of the first receiving member 235A and the

second receiving member 235B is capable of receiving a first projection 320 of the adjuster tool 300. The diameter of the first projection 320 of the adjuster tool 300 is chosen such that it is capable of engaging with any one of one or more receiving member(s) 235A. The second projection 330 of the adjuster tool 300 i engages with at least one slot of the adjustable spring seat 225. The head member 340 enables application of torque for rotation of the adjuster tool 300 in either a clockwise or an anti-clockwise direction.
[00044] The adjustable spring seat 225 is provided with contact portion 225B having a helical profile and is circumferentially disposed. Therefore, the contact
) portion 225B with varying contact points changes the axial position of the adjustable spring seat 225. In another embodiment, a stepped helical profile is provided. In this particular embodiment, rotation of the adjuster tool 300 in clockwise direction will rotate the adjustable spring seat 225 from right to left thereby the adjustable spring seat 225 is moved along the axis of the damper in a
i upward direction U. Similarly, rotation of the adjuster tool 300 in an anti-clockwise direction will rotate the adjustable spring seat 225 from left to right, thereby the adjustable spring seat 225 moves in a downward direction D. Adjustment of the adjustable spring seat 225 in the upward direction U decreases -preload on the shock absorber and adjustment of the adjustable spring seat in the
) second direction D. increases preload on the shock absorber 200. In another embodiment (not shown), rotation of the adjuster tool 300 in clockwise direction moves the adjustable spring seat in downward direction D and rotation of the adjuster tool 300 in anti-clockwise direction moves the adjustable spring seat in the upward direction U.
> [00045] Fig. 3 (a) depicts an adjuster tool 400, in accordance with another embodiment of the present subject matter. The adjuster tool 400 comprises of a base member 410 with a first end and a second end. A first projection 420 is provided on the first end of the base member 410. One or more second projection(s) 430 are extending radially outward, which are disposed transversely
) to the rotational axis A-A\ from the base member 410. In this particular

embodiment, there are four-second projection(s) 430A, 430B, 430C and 430D. Each of the second projection(s) 430A, 430B, 430C and 430D is provided with either same or different lengths. In a preferred embodiment, each of the second projection(s) 430A, 430B, 430C and 430D is chosen with different length that enables engagement of the second projection(s) 430A, 430B, 430C and 430D with the slots of the adjustable spring seat 225 of the shock absorber 200 (shown in Fig.2 (e)). A head member 440 is provided on the second end of the base member 410 that enables the user to hold the adjuster tool 400 and to provide torque for rotation in a clockwise or an anti-clockwise direction.. In another embodiment, the second projection(s) 430A, 430B, 430C and 430D may be attachably-removable with the adjuster tool.
[00046] The one or more receiving members(s) 235A, 235B provided on the shock absorber 200 is capable of receiving the adjuster tool 400. The adjustment of preload of the spring 215 is possible by rotation of the adjuster tool 400 in the clockwise or the anti-clockwise direction with respect to the rotational axis A-A' of the adjuster tool 400. The adjuster tool 400 enables adjustment of the adjustable spring seat 225 by rotation in a single axis, which the rotational axis A-AV
[00047] Fig. 3 (b) depicts adjuster tool 400 working with a shock absorber 200, in accordance with the embodiment depicted in Fig. 3 (a). The adjuster tool .400 is capable of rotatably engaging with the one or more receiving members 235A, 235B of the shock absorber 200. The rotation of the adjuster tool 400 will adjust the pre load of the spring 215 by movement of the adjustable spring seat 225 in upward direction U or downward direction D. The head member 440 enables the user to provide the required torque to the adjuster tool 400.
[00048] Further, the head member 440 is provided with a cavity 440A that is capable of receiving any additional tool for rotating the adjuster tool 400. This enables user of any additional tool in conjunction with the adjuster tool 400, whereby a shock absorber disposed at remote location on the vehicle will be accessible with ease.

[00049] Fig. 4 depicts a perspective view of an adjuster tool, 500 in accordance with yet another embodiment of the present subject matter. The adjuster tool 500 comprises of a base member 510 is provided with a first projection 520 that is disposed along the axial direction of the base member 510, which is along the rotation axis. The first projection 520 is integrally formed with . the base member 510. Further, at least one projection 530 is disposed transversely to the rotation axis of the adjuster tool 500. Further, the second projection 530 is removably disposed on the adjuster tool 500. The adjuster tool 500 is provided a head member (not shown) that acts a handle.
[00050] The second projection 530 is capable of engaging with slots provided on the adjustable spring seat of the shock absorber. The second projection 530 is provided with curved profile 530A that enable affective engagement of the preload adjuster tool 500 with the slots of the adjustable spring seat. This curved profile 530A provide improve the life of the adjuster tool 500 as compared to angular edges. Provision of curved profile 530A enables the second projections 530 to have any regular or irregular geometrical shape with the curved profile 530A provided at the edges.
[00051] In an embodiment, the adjuster tool is made of metal and the first projection, second projection(s), and the head members are integrally formed with the base member of the adjuster tool. In another embodiment, the adjuster tool is made of a rigid material including any known polymer.
[00052] Further, in another embodiment, the second projections are. adjustable and attachably-removably thereby the adjuster tool can be compactly disposed in the vehicle.
[00053] It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein. Many modifications and variations of the present subject matter are possible in the light of above disclosure. Therefore, within the scope of claims of the present subject matter, the present disclosure may be practiced other than as specifically described.

I/We claim:
1. A shock absorber (200) for a two-wheeled vehicle (100) comprising:
a fluid filled damper (205, 210) having a cylinder (205) and a piston rod (210) slidably movable therein;
a fixed spring seat (220) affixed to said piston rod (210);
an adjustable spring seat (225) slidably disposed about said cylinder (205);
at least one spring (215) disposed coaxially around said damper (205, 210), said at least one spring (215) confined by said fixed spring seat (220) and said adjustable spring seat (225) therebetween; and
one or more stopper pin(s) (230A, 230B) disposed abutting against said adjustable spring seat (225) to restrict motion of said adjustable spring seat (225) in a first direction (U),
wherein
one or more receiving member(s) (235A, 235B) are provided on said cylinder (205), said one or more receiving members (235A, 235B) capable of receiving an adjuster tool (300) and enable rotation of said adjuster tool (300) about a rotational axis (A-A') of said adjuster tool (300); and
said adjustable spring seat (225) is provided with one or more slots (225A)
that are annularly disposed on said adjustable spring seat (225), wherein said one
or more slots (225A) are capable of functionally engaging with said adjuster tool
(300). - ■ '
2. An adjuster tool (300, 400, 500) to work with a shock absorber (200) for
preload adjustment of said shock. absorber (200), said adjuster tool (300, 400)
comprising:

a base member (310, 410, 510) provided with a first projection (320, 420, 520) extending along rotational axis (A-A') of said base member (310, 410, 510) from one end of said base member (310, 410, 510);
at least one second projection (330, 430A, 430B, 430C, and 430D, 530) disposed on said base member (310, 410, 510) transversely to said rotational axis (A-A') of said base member (310, 410, 510); and
a head member (340, 440) provided on other end of said base member (310, 410),
wherein
said first projection (310, 410, 510) capable of rotatably engaging with one or more receiving members (235A, 235B) provided on a cylinder'(205) of said shock absorber (200); and
said at least one second projection (330, 430A, 430B, 430C, and 430D, 530) is capable of engaging with the plurality of slots (225A) that are annularly disposed on an adjustable spring seat (225) of said shock absorber (200), wherein rotation of said adjuster tool (300, 400, 500) about a rotational axis (A-A') of said adjuster tool (300, 400, 500) selectively adjusts said adjustable spring seat (225) in an axial direction (U-D) of said shock absorber (200).
3. The shock absorber (200) of claim 1, wherein said second projection (330, 430A, 430B, 430C, and 430D) comprises of a contact portion (225B) that abuts against said stopper pin(s) (230A, 230B) and said contact portion (225B) is provided with a helical profile and is disposed circumferentially about said cylinder (205).
4. The shock absorber (200) of claim 1, wherein said one or more receiving member(s) (235A, 235B) are having a circular profile including a circular projection or a circular cavity.
5. The adjuster tool (300, 400, 500) of claim 2, wherein said first projection (320,420^ 520) is having a circular profile including a circular cavity or a circular

projection that is rotatably engaging with a circular protrusion or a circular cavity, respectively, provided on said shock absorber (200).
6. The adjuster tool (400) of claim 2, wherein said head member (440) is provided with a cavity (440A) that is capable of engaging with any known tool.
7. The adjuster tool (500) of claim 2, said second projection(s) (530) is removably-attached to said base member (510).
8. The adjuster tool (500) of claim 2, wherein said second projection(s) (530) is provided with curved profile (530A).
9. The adjuster tool (400) of claim 2, wherein said base member (410), said first projection (430), said second projection(s) (430A, 430B, 430C and 430D), and said head member (440) are integrally formed.
10. A three-wheeled vehicle comprising the shock absorber (200) as claimed in any of the preceding claims.