FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
(See section 10 and rule 13)
SEAT HEIGHT ADJUSTMENT MECHANISM
MAHINDRA TWO-WHEELERS LIMITED,
an Indian Company
of Dl Block, Plot No. 18/2 (Part), MIDC, Chinchwad,
Pune - 411 019, Maharashtra, India.
INVENTORS:
1. EKAMBARAM MANSHA KUTTY
2. BHARTHUAR OM PRAKASH
3. KAMALAPURKAR MANOJ
4. RAGUPATHI GOVINDARAJAN
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF DISCLOSURE
The present disclosure relates to a seat adjustment mechanism for vehicles. More particularly, the present disclosure relates to a seat height adjustment mechanism for a two-wheeler vehicle such as a motorcycle or a scooter or any other two wheeled vehicle.
BACKGROUND
Vehicles, typically, two-wheeler vehicles like motorcycles or scooters, are provided with a seat securely mounted on a frame structure of the two-wheeler vehicles. Seats should provide comfort to riders as well as pillion riders sitting thereon. Seats for the riders and the pillion riders may be a single piece extended seat or the seats of the rider may be separate from the seats of the pillion riders. Conventionally, seats of two-wheeler vehicles are at fixed height from the ground. Riders of two-wheeler vehicles should be seated at a proper height with respect to the ground so that the riders maintain the right posture and thereby can better control the two-wheeler vehicles and experience smooth comfortable riding. Also, when the two-wheeler vehicles are not moving, it should be convenient for the riders to rest his legs on the ground to balance the two-wheeler vehicles. As it is not necessary that the two-wheeler vehicles are used by the same riders, the height of the seat of the two-wheeler vehicles are required to be adjusted depending upon the height of the riders. However, the height of conventional seats of the two-wheeler vehicles cannot be adjusted to cater to riders of different heights. If the riders of the two-wheeler vehicles are not comfortably seated on the two-wheeler vehicles, the riders fail to properly control the two-wheeler vehicles and also fail to maintain a proper riding posture that may cause backache cramps or other problems.

Furthermore, if the two-wheeler vehicles are designed for riders with an average height and the two-wheeler vehicles are used by riders having more height, the legs of the riders having more height, while resting on foot board, are likely to touch the front parts of the two-wheeler vehicles thereby causing inconvenience to the riders.
Furthermore, improper riding posture during long rides may cause fatigue to the riders, thereby increasing the chances of accidents.
Accordingly, there is a need for a seat adjustment mechanism for two-wheeler vehicles that enables seat height adjustment depending upon rider comfort. Further, there is a need for a seat adjustment mechanism for two-wheeler vehicles that is simple in construction and easy to use.
Further, there is a need for a seat adjustment mechanism for two-wheeler vehicles that assists the rider in maintaining the right posture and for smooth riding comfort. Furthermore, there is a need for a seat adjustment mechanism for two-wheeler vehicles that facilitates better control to the rider and prevents accidents due to fatigue of the rider arising due to inappropriate riding posture of the rider.
OBJECTS
Some of the objects of the system of the present disclosure are aimed to ameliorate one or more problems of the prior art or to at least provide a useful alternative and are listed herein below.

An object of the system of the present disclosure is to provide a seat adjustment mechanism for two-wheeler vehicles that enables seat height adjustment depending upon rider comfort.
Another object of the system of the present disclosure is to provide a seat adjustment mechanism for two-wheeler vehicles that is simple in construction and easy to use.
Still another object of the system of the present disclosure is to provide a seat adjustment mechanism for two-wheeler vehicles that is easily retro-fitted to conventional two-wheeler vehicles.
Yet another object of the system of the present disclosure is to provide a seat adjustment mechanism for two-wheeler vehicles that assists the rider in maintaining the right posture and for smooth riding comfort.
One more object of the system of the present disclosure is to provide a seat adjustment mechanism for two-wheeler vehicles that facilitates better control to the rider and prevents accidents due to fatigue of the rider arising due to inappropriate riding posture of the rider.
Another object of the system of the present disclosure is to provide a vehicle that has a reliable mechanism to adjust seat height.
Other objects and advantages of the present disclosure will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present disclosure.

SUMMARY
A seat height adjustment mechanism for a vehicle is disclosed. The mechanism includes a front height adjusting mechanism, at least one central height adjusting mechanism and a hinge mechanism. The front height adjusting mechanism is disposed between an operative front portion of a seat of the vehicle and a chassis of the vehicle. The front height adjusting mechanism lockingly facilitates vertical movement of the operative front portion of the seat with respect to the chassis. At least one central height adjusting mechanism disposed between an operative central portion of the seat and the chassis. The central height adjusting mechanism co-operates with the front height adjusting mechanism, facilitating vertical movement of the operative central portion of the seat with respect to the chassis corresponding to the vertical movement of the operative front portion of the seat. The hinge mechanism is mounted on the chassis and supports an operative back portion of the seat for facilitating angular movement of the seat with respect to the chassis about the hinge mechanism, thereby facilitating rearward opening of the seat, for defining a first configuration in which the seat lockingly co-operates with the chassis and a second configuration in which the seat moves away from the chassis for accessing an area operatively beneath the seat.
In one embodiment, the front height adjusting mechanism includes an elongate element, a tubular element, a seat supporter and a lever and rod linkage. The elongate element is secured to and upstanding from the chassis. The tubular element is telescopically movable over the elongate element. The tubular element is locked at any desired position over the elongate element. The seat supporter is mounted on an operative top portion of the tubular element and operatively vertically moves along with the tubular element. The seat supporter in an operative configuration lockingly co-operates with the operative front

portion of the seat for facilitating vertical movement of the operative front portion of the seat. The seat supporter in an in-operative configuration unlocks and disengages from the operative front portion of the seat. The lever and rod linkage, wherein an operative top end of a rod thereof is connected to the tubular element and an operative bottom end of the rod is connected to a lever mounted on the operative bottom portion of the elongate element, wherein movement of the tubular element actuates the rod, which in turn actuates the lever and the lever actuates an actuating cable functionally coupled to the at least one central height adjusting mechanism for facilitating co-operation between the front height adjusting mechanism and the central height adjusting mechanism.
Typically, the tubular element is manually moved and locked by a spring loaded knob.
In one embodiment, the central height adjusting mechanism includes a rotatable actuator, a pair of spring biased elements and a pair of rods. The rotatable actuator functionally connected to the front height adjusting mechanism and is actuated by the actuating cable of the front height adjusting mechanism. The pair of spring biased elements, each of the spring biased element in a normal configuration thereof maintains a seat supporting pad in raised configuration for supporting the operative central portion of the seat to define a raised configuration thereof. The pair of rods, wherein each of the rods is functionally coupled to the rotatable actuator at one end and a corresponding spring biased element at another end and in an operative configuration pulls the corresponding spring biased elements against spring force as the rotatable actuator rotates, thereby lowering the seat supporting pad defining a lowered configuration thereof, which in turn causes lowering of the central portion of the seat corresponding to lowering of the front portion of the seat.

Typically, the seat height adjustment mechanism further includes a secondary spring biased element that enables the seat supporting pad in raised configuration.
In one embodiment, the seat height adjustment mechanism further includes a pair of rubber stoppers disposed in between the pair of seat supporting plates and the operative bottom portion of the seat.
Typically, the hinge mechanism vertically moves the operative back portion of the seat in co-operation with the front height adjusting mechanism and the central height adjusting mechanism and enabling the. seat to be opened rearward.
In one embodiment, the seat height adjustment mechanism further includes a sensing device that senses position of the seat and a seat height indication system co-operating with the sensing device and adapted to display the position of the seat.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
The system of the present disclosure will now be described with the help of the accompanying drawings, in which:
Figure 1 illustrates a perspective view of a seat height adjustment mechanism in accordance with an embodiment of the present disclosure mounted on a chassis of a two-wheeler vehicle, wherein the seat adjustment mechanism includes a front height adjusting mechanism, a central height adjusting mechanism and a hinge mechanism;

Figure 2 illustrates another perspective view of the seat adjustment mechanism of Figure 1;
Figure 3 illustrates a perspective view of the seat adjustment mechanism of Figure 1 assembled to an underside of a seat of the two-wheeler vehicle;
Figure 4a illustrates a perspective view of the front height adjusting mechanism of the seat height adjustment mechanism of Figure 1;
Figure 4b illustrates another perspective view of the front height adjusting mechanism of Figure 4a;
Figure 4c illustrates a cross member for connecting the chassis to the front height adjusting mechanism of Figure 4a;
Figure 4d illustrates a perspective view of the front height adjusting mechanism of Figure 4a, depicting a pair of hole-slot disposed thereon;
Figure 5 illustrates a perspective view of the central height adjusting mechanism of the seat height adjustment mechanism of Figure 1;
Figure 6 illustrates the central height adjusting mechanism of Figure 5 assembled to the underside of the seat of the two-wheeler vehicle; and
Figure 7 illustrates a perspective view of the hinge mechanism of the seat adjustment mechanism of Figure 1 assembled to the underside to the seat of the two-wheeler vehicle.

DETAILED DESCRIPTION
The system of the present disclosure will now be described with reference to the embodiment shown in the accompanying drawing. The embodiment does not limit the scope and ambit of the disclosure. The description relates purely to the examples and preferred embodiments of the disclosed system and its suggested applications.
The system herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known parameters and processing techniques are omitted so as to not unnecessarily obscure the embodiment herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiment herein may be practiced and to further enable those of skill in the art to practice the embodiment herein. Accordingly, the examples should not be construed as limiting the scope of the embodiment herein.
The present disclosure envisages a seat adjustment mechanism for two-wheeler vehicles that enables seat height adjustment depending upon rider comfort. The seat adjustment mechanism is mounted on a chassis of the two- wheeler vehicles so that the chassis provides stable support to the seat height adjustment mechanism. Further, the seat height adjustment mechanism is connected to the bottom side of a seat to enable the seat to get raised and lowered to suit different riders. The seat height adjustment mechanism stably raises and stably lowers the seat of the vehicle to cater to different riders. The seat height adjustment mechanism adjusts the seat height to provide appropriate riding posture to the rider, thereby eliminating the chances of accidents occurring due to fatigue and improper posture of the rider.

Figure 1 and Figure 2 illustrate the seat adjustment mechanism 1000 for adjusting the seat height of the seat 500 (illustrated in Figure 3) of the two-wheeler vehicles. The seat adjustment mechanism 1000 is mounted on the chassis 100. The seat height adjustment mechanism 1000 includes at least one front height adjusting mechanism 200, at least one central height adjusting mechanism 300 and a hinge mechanism 400.
Figure 4a and Figure 4b illustrate the front height adjusting mechanism 200. The front height adjusting mechanism 200 is disposed between an operative front portion of the seat 500 (as illustrated in Figure 3) of the vehicle and the chassis 100 (as illustrated in Figure 1 and Figure 2) of the vehicle. More specifically, the front height adjusting mechanism 200 is connected to the chassis 100, particularly to cross member 115 (as illustrated in Figure 4c) or to a first frame element 120 of the chassis 100.
In one embodiment, the front height adjusting mechanism 200 has at least a pair of holes 205a and 205b (as illustrated in Figure 4d) that co-operate with the corresponding hole- slot arrangement 115a and 115b (as illustrated in Figure 4c) of the cross member 115 thereby enabling clamping of the front height adjusting mechanism 200 with the cross members 115. Typically, the slots 205a, 205b, 115a and 115b are of equal size. Alternatively, the slot 115a is comparatively larger in size, as illustrated in Figure 4d, enabling angular adjustment of the front height adjusting mechanism 200 with respect to the cross member 115. The angular adjustments are required to accommodate varying tolerances and manufacturing variations of cross members 115 and the seat 500. The angular adjustments enable easy locking of the seat 500 with the front height adjusting mechanism 200.

The front height adjusting mechanism 200 lockingly facilitates vertical movement of the operative front portion of the seat 500 with respect to the chassis 100. In accordance with one embodiment of the invention, the front height adjusting mechanism 200 includes an elongate element 210, a tubular element 220, a seat supporter 230 and a lever and rod linkage 260. The elongated element 210 is secured to and upstands from the chassis 100. The tubular element 220 telescopically moves over the elongate element 210. The tubular element 220 is locked at any desired position over the elongate element 210. Further, the tubular element 220 has a slot 225 for enabling movement of a spring loaded knob 250 there-within. The slot 225 accommodates the spring loaded knob 250 so that there is easy movement of the tubular element 220 over the elongated element 210, thereby enabling height adjustment of the seat 500 with respect to the chassis 100. The spring loaded knob 250, in operative configuration twist a spring (not illustrated in Figures), typically at 90 degrees, configured there-within to facilitate vertical movement of the tubular element 220 over the elongate element 210. Alternatively, the knob 250 may be axially pulled without twisting to facilitate vertical movement of tubular element 220 over elongated element 210. The spring loaded knob 250, in an in-operative configuration, facilitates locking of the tubular element 220 on the elongate element 210 at the desired height. In one embodiment, the spring loaded knob 250 is manually actuated. In another embodiment, the spring loaded knob 250 is automatically actuated.
The seat supporter 230 is mounted on an operative top portion of the tubular element 220 and operatively vertically moves along with the tubular element 220. In one embodiment, the seat supporter 230 is integrally connected to the tubular element 220. In another embodiment, the seat supporter 230 is a separate element and is fixedly connected to the tubular element 220. The seat supporter 230 in an operative configuration lockingly co-operates with the

operative front portion of the seat 500 for facilitating vertical movement of the operative front portion of the seat 500. Typically, the seat 500 is locked with the seat supporter 230 by a seat lock element (not shown in the figures) connected to the seat supporter 230. The seat lock element is operated by seat lock cable 240. The seat supporter 230 in an in-operative configuration unlocks and disengages from the operative front portion of the seat 500 that facilitates access to the area, typically storage area, disposed under the seat 500.
The lever and rod linkage 260 includes a rod 265 and a lever 270.The rod 265 has an operative top end connected to the tubular element 220 and an operative bottom end connected to a lever 270, pivotally mounted on the operative bottom portion of the elongate element 210. Alternatively, the lever 270 may be mounted on the first frame element 120 of the chassis 100. The movement of the tubular element actuates the rod 265, which in turn actuates the lever 270 and the lever 270 actuates an actuating cable 330 functionally coupled to the at least one central height adjusting mechanism 300 for facilitating co-operation between the front height adjusting mechanism 200 and the central height adjusting mechanism 300. Typically, the lever 270 is connected to the elongate element 210 by a pin 270a.
In accordance with one embodiment of the present disclosure and as illustrated in Figure 5 and Figure 6, the central height adjusting mechanism 300 includes a rotatable actuator 340, a pair of spring biased elements 315a and 315b and a pair of rods 350a and 350b. The rotatable actuator 340 is functionally connected to the front height adjusting mechanism 200 and is actuated by the actuating cable 330 of the front height adjusting mechanism 200.
The pair of spring biased elements 315a and 315b includes a pair of frames 310a and 310b, a pair of seat actuators 360a and 360b and a pair of seat

supporting pads 320a and 320b. The pair of frames 310a and 310b is rigidly disposed, typically by bolts 315, on the chassis 100. The pair of frames 310a and 310b rigidly supports the pair of seat supporting pads 320a and 320b. The pair of seat actuators 360a and 360b enables raising and lowering of the respective pair of seat supporting pads 320a and 320b. The pair of seat actuators 360a and 360b have a pair of springs 370a and 370b respectively disposed thereon. Each of the spring biased elements 315a and 315b in a normal configuration thereof maintains the respective pair of seat supporting pad 320a and 320b in raised configuration for supporting the operative central portion of the seat 500 to define a raised configuration thereof.
The pair of rods 350a and 350b, wherein each of the rods 350a and 350b are functionally coupled to the rotatable actuator 340 at one end and a corresponding spring biased elements 315a and 315b at another end, in an operative configuration pull the corresponding spring biased elements 315a and 315b against the spring force as the rotatable actuator 340 rotates, thereby lowering the seat supporting pads 320a and 320b for defining a lowered configuration thereof, which in turn causes lowering of the central portion of the seat 500 corresponding to lowering of the front portion of the seat 500.
The central height adjusting mechanism 300 further includes a pair of rubber bushes 395a and 395b disposed in between the operative bottom of the seat 500 and the respective seat supporting pads 320a and 320b to avoid direct contact thereof.
Additionally, the seat adjustment mechanism 1000 further includes a secondary spring biased element that maintains the pair of seat supporting pad 320a and 320b in raised configuration when the seat load is removed. The secondary spring biased element includes a connecting rod 380 and a pair of torsion

springs such as 390a; The connecting rod 380 is disposed between the pair of frames 310a and 310b and is functionally connected to the pair of frames 310a and 310b. Typically, the connecting rod 380 is connected to the pair of frames 310a and 310b by a pair of split pins such as 385a. Further, the connecting rod 380 has a plurality of torsion springs 390a and 390b. The pair of torsion springs 390a and 390b is disposed on the connecting rod 380. The secondary spring biased element enables the seat supporting pads 320a and 320b in raised configuration when the seat load is removed.
In accordance with one embodiment of the present disclosure and as illustrated in Figure 1, Figure 2, Figure 3 and Figure 7, the hinge mechanism 400 is disclosed. The hinge mechanism 400 is mounted on the chassis 100 and supports an operative back portion of the seat 500 for facilitating angular movement of the seat 500 with respect to the chassis 100 about the hinge mechanism 400, thereby facilitating rearward opening of the seat 500, for defining a first configuration in which the seat 500 lockingly co-operates with the chassis 100 and a second configuration in which the seat 500 moves away from the chassis 100 for accessing the area operatively beneath the seat 500. The hinge mechanism 400 enables pivotal rotation of the seat 500 with respect to the chassis 100. More specifically, the operative front portion of the seat 500 is un-locked from the front height adjusting mechanism 200 and the operative back portion of the seat 500 is pivotally rotated about the hinge mechanism 400 for accessing the area operatively beneath the seat 500 thereby the hinge mechanism 400, disposed rearwardly, enables rearward opening of the seat 500 instead of conventional hinge mechanisms that enable front opening of the seat with respect to chassis. The rearward opening of the seat 500 enables the rider to conveniently and ergonomically operate the tubular element 220 of the front height adjusting mechanism 200.

In accordance with one embodiment of the present disclosure, the hinge mechanism 400 is adjustable and is raised or lowered to support the seat 500 at the desired height. The hinge mechanism 400 includes a hinge plate 410 and a clamping plate 420. Typically, the hinge plate 410 is welded to the second frame element 140 (as illustrated in Figure 1 and Figure 2) that is connected to the chassis 100. The hinge plate 410 is pivotally connected by means of a pin 440 to the clamping plate 420. The clamping plate 420 is bolted by means of a plurality of bolts and nuts 430a, 430b, 430c and 430d to the bottom of the seat 500.
The method for lowering the seat 500 is carried out by pulling out the spring loaded knob 250 and then twisting the spring loaded knob 250, typically at 90 degree, to unlock the tubular element 220 from the elongated element 210. The spring loaded knob 250 is pulled thereby enabling easy vertical movement of the tubular element 220 on the elongated element 210. The tubular element 220 is lowered on the elongated element 210 that in turn lowers the seat supporter 230. Lowering of the seat supporter 230 lowers the operative front portion of the seat 500. After achieving the desired height of the seat 500, the spring loaded knob 250 is released thereby locking the tubular element 220 with the elongated element 210 for enabling locking of the seat 500 at the desired lowered height. As the tubular element 220 is lowered, the rod 265 of the lever and rod linkage 260 is actuated and pushed down that in turn pivotally actuates the lever 270. The actuation of the lever 270 upwardly pulls the actuating cable 330 thereby inducing tension there-within. The tension induced in the actuating cable 330 moves the actuating cable 330 from its normal configuration. The movement of the actuating cable 330 in turn rotates the rotatable actuator 340 in counter clockwise direction thereby changing the configuration of the rotatable actuator 340 from its initial configuration. The rotation of the rotatable actuator 340 in counter clockwise direction pulls the pair of rods 350a and 350b

inwardly that in turn pulls the pair of seat actuators 360a and 360b inwardly. As the pair of seat actuators 360a and 360b moves inwardly, the pair of spring 370a and 370b gets compressed thereby storing energy there-within. Also, the inward movement of the pair of seat actuators 360a and 360b enables lowering of the respective seat supporting pads 320a and 320b. The lowering of the seat supporting pads 320a and 320b lowers the operative middle portion of the seat 500.
The method for raising the seat 500 is carried by pulling out the knob 250 and then twisting the spring loaded knob 250 to unlock the tubular element 220 from the elongated element 210. The spring loaded knob 250 is pulled thereby enabling easy vertical movement of the tubular element 220 on the elongated element 210. The tubular element 220 is raised on the elongated element 210 that in turn raises the seat supporter 230. Raising of the seat supporter 230 raises the operative front portion of the seat 500. After achieving the desired height of the seat 500, the spring loaded knob 250 is released thereby locking the tubular element 220 with the elongated element 210 for enabling locking of the seat 500 at the desired raised height. As the tubular element 220 is raised, the rod 265 of the lever and rod linkage 260 is actuated and pushed upward that in turn pivotally actuates the lever 270. The actuation of the lever 270 releases the induced tension of the actuating cable 330 and releases the actuating cable 330 to the normal configuration that in turn rotates the rotatable actuator 340 in a clockwise direction till the rotatable actuator 340 reaches its initial configuration. The clockwise rotation of the rotatable actuator 340 releases tension induced within the pair of rods 350a and 350b. The released tension releases the energy stored within the pair of spring 370a and 370b, which enables outward movement the pair of seat actuators 360a and 360b thereby enabling raising of the respective seat supporting pads 320a and 320b. Raising

of the seat supporting pads 320a and 320b raises the operative middle portion of the seat 500.
In one embodiment, the seat height adjustment mechanism 1000 further includes a sensing device (not illustrated in Figures) that senses the position of the seat and a seat height indication system (not illustrated in Figures) co-operating with the sensing device and displays the position of the seat 500. Typically, the sensing device senses the rotation of the rotatable actuator 340 and transmits signals to the seat height indication system, disposed on the dashboard, for indicating the position or height of the seat 500. Alternatively, a switch (not illustrated in Figures) is used to sense the position of the seat 500. The operative condition of the switch serves to provide required input signals to the seat height indication system. Typically, the switch may be of a single throw double pole type.
TECHNICAL ADVANCEMENTS AND ECONOMIC SIGNIFICANCE
The technical advancements offered by the system of the present disclosure include the realization of:
• a seat adjustment mechanism for two-wheeler vehicles that enables seat height adjustment depending upon rider comfort;
• a seat adjustment mechanism for two-wheeler vehicles that is simple in construction and easy to use;
• a seat adjustment mechanism for two-wheeler vehicles that is easily retro¬fitted to conventional two-wheeler vehicles;
• a seat adjustment mechanism for two-wheeler vehicles that assists the rider in maintaining the right posture and smooth riding comfort;

• a seat adjustment mechanism for two-wheeler vehicles that facilitates better control to the rider and prevents accidents due to fatigue of the rider arising due to inappropriate riding posture of the rider;
• a seat adjustment mechanism for a two-wheeler that facilitates riders of different heights to comfortably keep their feet on the floor board; and
• a vehicle that has a reliable mechanism to adjust seat height.
The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

We Claim:
1. A seat height adjustment mechanism for a vehicle, said mechanism comprising:
• a front height adjusting mechanism disposed between an operative front portion of a seat of said vehicle and a chassis of said vehicle, said front height adjusting mechanism adapted to lockingly facilitate vertical movement of said operative front portion of said seat with respect to said chassis;
• at least one central height adjusting mechanism disposed between an operative central portion of said seat and said chassis, said central height adjusting mechanism co-operates with said front height adjusting mechanism, adapted to facilitate vertical movement of said operative central portion of said seat with respect to said chassis corresponding to the vertical movement of said operative front portion of said seat; and
• a hinge mechanism mounted on said chassis and adapted to support an operative back portion of said seat for facilitating angular movement of said seat with respect to said chassis about said hinge mechanism, thereby facilitating rearward opening of said seat, for defining a first configuration in which said seat lockingly co-operates with said chassis and a second configuration in which said seat moves away from said chassis for accessing an area operatively beneath said seat.
2. The seat height adjustment mechanism as claimed in claim 1, wherein said front height adjusting mechanism comprises:
o an elongate element secured to and upstanding from said chassis;

o a tubular element telescopically movable over said elongate element, said tubular element adapted to be locked at any desired position over said elongate element;
o a seat supporter mounted on an operative top portion of said tubular element and adapted to move operatively vertically along with said tubular element, said seat supporter in an operative configuration adapted to lockingly co-operate with said operative front portion of said seat for facilitating vertical movement of said operative front portion of said seat, said seat supporter in an in-operative configuration adapted to unlock and disengage from said operative front portion of said seat; and
o a lever and rod linkage, wherein an operative top end of a rod thereof is connected to said tubular element and an operative bottom end of said rod is connected to a lever mounted on said operative bottom portion of said elongate element, wherein movement of said tubular element actuates said rod, which in turn actuates said lever, and said lever actuates an actuating cable functionally coupled to said at least one central height adjusting mechanism for facilitating co-operation between said front height adjusting mechanism and said central height adjusting mechanism.
3. The seat height adjustment mechanism as claimed in claim 1, wherein said tubular element is adapted to be manually moved and locked by a spring loaded knob.
4. The seat height adjustment mechanism as claimed in claim 1, wherein said central height adjusting mechanism comprises:

o a rotatable actuator functionally connected to said front height adjusting mechanism and adapted to be actuated by said actuating cable of said front height adjusting mechanism;
o a pair of spring biased elements, each of said spring biased element in a normal configuration thereof adapted to maintain a seat supporting pad in raised configuration for supporting said operative central portion of said seat to define a raised configuration thereof; and
o a pair of rods, wherein each of said rods is functionally coupled to said rotatable actuator at one end and a corresponding spring biased element at another end and in an operative configuration adapted to pull said corresponding spring biased elements against spring force as said rotatable actuator rotates, thereby lowering said seat supporting pad defining a lowered configuration thereof, which in turn cause lowering of said central portion of said seat corresponding to lowering of said front portion of said seat.
5. The seat height adjustment mechanism as claimed in claim 3, further comprises a secondary spring biased element adapted to enable said seat supporting pad in raised configuration.
6. The seat height adjustment mechanism as claimed in claim 3, further comprises a pair of rubber stoppers disposed in between said pair of seat supporting plates and said operative bottom portion of said seat.
7. The seat height adjustment mechanism as claimed in claim 1, wherein said hinge mechanism is adapted to vertically move an operative back

portion of said seat in co-operation with said front height adjusting mechanism and said central height adjusting mechanism.
8. The seat height adjustment mechanism as claimed in claim 1, further includes a sensing device adapted to sense position of said seat and a seat height indication system co-operating with said sensing device and adapted to display said position of said seat.