BACKREST FOR TWO/THREE WHEELER AUTOMOTIVES
FIELD OF INVENTION
[01] The present disclosure relates to a field providing a backrest support on a two/three wheeler automotive. More specifically, the present disclosure relates to a retracting assembly facilitating the backrest support on the two/three wheeler automotive.
BACKGROUND
[02] It is known that two/three wheeler automotive is widely used for moving from one place to another. Generally, the two/three wheeler automotive are used and operated by a rider. However, the two/three wheeler automotive may be provided with a seat such that a passenger may be seated behind the rider.
[03] With widespread use of the two/three wheeler automotive, several designs of the seats have been proposed. The designs may include, but not limited to, having an adjustable seat, providing a backrest that is mounted to a frame of the two/three wheeler automotive and so on. The backrest may be provided to support the rider of the two/three wheeler automotive at his back. Several designs have been proposed in past that disclose multiple embodiments of the backrests that can be installed on the two/three wheeler automotive.
[04] One such embodiment is disclosed in a United States Patent 7621362, by Masao Ogawa, et al. US7621362 discloses a slidable seat structure provided for a two- or three-wheeled vehicle wherein a seat is attached to a body of the two- or three-wheeled vehicle through a seat slide mechanism. The seat is moved longitudinally by operation of an operating piece attached to the seat slide mechanism. The slidable seat structure comprises a slide lock mechanism adapted to disable the longitudinal movement of the seat separately from the operating piece. The slide lock mechanism is provided with an interlocking lock member to maintain the seat in its locked state.
[05] It should be understood that the above design has drawbacks. This is because; the rider has to disengage the interlocking lock member to release the seat from its locked state to an unlock state such that the seat can be put back on to passenger seat. If the rider forgets to

disengage the interlocking lock member when the seat is in locked state and tries to get off the two/three wheeler automotive, then the rider may hit his leg against the seat and may get injured. Further, the slidable seat structure disclosed in the US7621362 is slidable horizontally. In other words, the slidable seat structure is adjusted in horizontal axis with respect to the seat structure. However, there is no mechanism provided to adjust height of the seat structure.
[06] Therefore, there is a need for a backrest structure that should be easily operable by the rider from its locked state to unlock state, and vice versa and further adjust the height of the backrest structure.
SUMMARY
[07] This summary is provided to introduce concepts related to a backrest on a two/three wheeler automotive and the concepts are further described below in the detailed description. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[08] In one aspect of the present disclosure, a retracting assembly facilitating backrest support on a two/three wheeler automotive is disclosed. The retracting assembly comprises a backrest support structure, and a first side connecting rod assembly and a second side connecting rod coupled to the backrest support structure. The first side connecting rod assembly and the second side connecting rod are coupled to a slider assembly and there by frame of the two/three wheeler automotive. The first side connecting rod assembly comprises a return spring to facilitate rotation of the backrest support structure. The second side connecting rod comprises a locking mechanism to lock movement of the backrest support structure with respect to the second side connecting rod. The retracting assembly further comprises a slider assembly coupled to the frame, substantially in perpendicular, to facilitate raising and lowering of the first side connecting rod assembly and the second side connecting rod.
[09] In another aspect of the present disclosure, the locking mechanism comprises a lock tube for locking the backrest support structure with respect to the second side connecting rod.

[10] In another aspect of the present disclosure, the locking mechanism comprises a lever mechanism for locking the backrest support structure with respect to the second side connecting rod.
[11] In another aspect of the present disclosure, the slider assembly comprises a slider locking mechanism to facilitate raising and lowering of the first side connecting rod assembly and the second side connecting rod.
BRIEF DESCRIPTION OF DRAWINGS
[12] The detailed description is described with reference to the accompanying figures. In the figures, a reference number is used to identify a part of the apparatus for cleaning solar panels. The same numbers are used throughout the drawings to refer like/similar features and components.
[13] FIG. 1 illustrates a perspective view of a retracting assembly, in accordance with an embodiment of the present disclosure;
[14] FIG. 2A and 2B illustrate an exploded view and perspective view of a backrest support structure, respectively, in accordance with an embodiment of the present disclosure;
[15] FIG. 3 illustrates a cross-sectional view of the retracting assembly locking mechanism;
[16] FIG. 3A illustrates a perspective view of a first side connecting rod;
[17] FIG. 3B illustrates a perspective view of a backrest spring tab;
[18] FIG. 3C illustrates the backrest spring tab coupled to the first side connecting rod;
[19] FIG. 3D illustrates a front view of a return spring;
[20] FIG. 3E, illustrates a cross-sectional view showing the return spring coupled to the backrest spring tab and the first side tube connector;

[21] FIG. 3E illustrates a perspective view of the second side connecting rod;
[22] FIG. 3G illustrates a lock tube;
[23] FIG. 4A and 4B illustrate the retracting assembly comprising the backrest support structure in upright position;
[24] FIG. 4C and 4D illustrate the backrest support structure at 45 degree position;
[25] FIG. 4E and 4F illustrate the backrest support structure in down position;
[26] FIG. 5A and 5B illustrate a perspective view and a rear view of a slider bracket assembly coupled to a frame;
[27] FIG. 6 illustrates the frame;
[28] FIG. 7A illustrates a second mounting plate;
[29] FIG. 7B illustrates a trigger holder;
[30] FIG. 7C illustrates the trigger holder coupled to the second mounting plate;
[31] FIG. 8 illustrates a second slider assembly;
[32] FIG. 8A illustrates an exploded view of the second slider assembly;
[33] FIG. 9A and 9B illustrate exploded and perspective view of the second slider assembly coupled to the mounting plate;
[34] FIG. 10 illustrates an enlarged view of a slider locking mechanism assembly; [35] FIG. 11 illustrates a trigger;

[36] FIG. 12 illustrates an exploded view of the slider mechanism assembly;
[37] FIG. 13A, and 13B illustrate the backrest support structure coupled to a seat cushion;
[38] FIG. 14A and 14B illustrate the slider mechanism and retracting assembly couple to a frame;
[39] FIG. 15A and 15B illustrate the retracting assembly with the seat cushion affixed to the two/three wheeler automotive;
[40] FIG. 16 illustrates a perspective view of a retracting assembly, in accordance with another embodiment of the present disclosure;
[41] FIG. 17A and 17B illustrate a perspective and an exploded view of the backrest support structure, in accordance with another embodiment of the present disclosure;
[42] FIG. 18A illustrates a fourth side connecting rod coupled to a fourth side tube
connector;
[43] FIG. 18B illustrates the fourth side connecting rod;
[44] FIG. 18C illustrates a rear view of a fourth side connecting rod assembly; [45] FIG. 19A illustrates a perspective view of the retracting assembly;
[46] FIG. 19B shows a cross-sectional view of a lever coupled to the fourth side connecting rod;
[47] FIG. 19C shows a cross-sectional side view of the fourth side tube connector comprising a lock pin in a first pin hole; and
[48] FIG. 20A and 20B illustrate operation of the retracting assembly.

DETAILTED DESCRIPTION
[49] The following detailed description is intended to provide example implementations to one of ordinary skill in the art, and is not intended to limit the disclosure to the explicit disclosure, as one of ordinary skill in the art will understand that variations can be substituted that are within the scope of the disclosure as described.
[50] The present disclosure relates to a retracting assembly for providing backrest support on a two/three wheeler automotive. The retracting assembly comprises a backrest support structure, a first side connecting rod assembly and a second side connecting rod. The first side connecting rod assembly and the second side connecting rod are coupled to the backrest support structure. The first side connecting rod assembly and the second side connecting rod are coupled to a frame of the two/three wheeler automotive. The first side connecting rod assembly comprises a return spring to facilitate rotation of the backrest support structure. The second side connecting rod comprises a locking mechanism to lock movement of the backrest support structure with respect to the second side connecting rod. The retracting assembly further a slider assembly coupled to the frame, substantially in perpendicular, to facilitate raising and lowering of the first side connecting rod assembly and the second side connecting rod. The slider assembly comprises a slider locking mechanism to facilitate raising and lowering of the first side connecting rod assembly and the second side connecting rod.
[51] In one implementation, the locking mechanism comprises a lock tube for locking the backrest support structure with respect to the second side connecting rod. In another implementation, the locking mechanism comprises a lever and pin mechanism for locking the backrest support structure with respect to the second side connecting rod.
[52] The various implementations of the retracting assembly are explained with the help of Figures 1-20B.
[53] Referring to FIG. 1, a perspective view of a retracting assembly 10 is shown, in accordance with one embodiment of the present disclosure. The retracting assembly 10 comprises a first side connecting rod assembly 20 and a second side connecting rod 50. The retracting assembly 10 further comprises a backrest support structure 70 coupled to the first side connecting rod assembly 20 at one end and to the second side connecting rod 50 at

another end. In one example, the backrest support structure 70 may be made up of a plastic, or a stainless steel, or aluminium. It should be understood that the backrest support structure 70 may comprise a hollow structure or a rigid structure. The backrest support structure 70 comprises a frame support bracket 72. The frame support bracket 72 may be made up of a plastic, or a stainless steel, or aluminium. The frame support bracket 72 is provided to strengthen the backrest support structure 70. Further, the backrest support structure 70 comprises stay brackets 74 provided at corners of the seta tube structure 70. The stay brackets 74 may be made up of a plastic, or a stainless steel, or aluminium. In one example, the stay brackets 74 are welded to the backrest support structure 70. The function of stay brackets 74 is explained at subsequent portion of the description. The retracting assembly 10 further comprises a lock tube 80 to lock the backrest support structure 70 with respect to the second side connecting rod 50.
[54] Referring to FIG. 2A, an exploded view of the backrest support structure 70 is shown, in accordance with one embodiment of the present disclosure. As can be seen, the backrest support structure 70 comprises the frame support bracket 72 and the stay brackets 74. Further, the backrest support structure 70 comprises a first side tube connector 76 at one end. Further, the backrest support structure 70 comprises a second side tube connector 78 at another end. Each of the first side tube connector 76 and the second side tube connector 78 is made up of aluminium, stainless steel, or any suitable material. The first side tube connector 76 is coupled to the first side connecting rod assembly 20. Similarly, the second side tube connector 78 is coupled to the second side connecting rod 50, as shown in FIG. 2B.
[55] Now Referring to FIG. 3, a cross-sectional view of the retracting assembly 10 comprising the backrest support structure 70 coupled to the first side connecting rod assembly 20 at one end and the second side connecting rod 50 is shown. As can be seen, the first side connecting rod assembly 20 is coupled to the backrest support structure 70 using the first side tube connector 76. Similarly, the second side connecting rod 50 is coupled to the backrest support structure 70 using the second side tube connector 78.
[56] The first side connecting rod assembly 20 comprises a first side connecting rod 2. Referring to FIG. 3A, a perspective view of the first side connecting rod 21 is shown. The first side connecting rod 21 comprises a first revolute joint bearing area 22. Further, the first side connecting rod 21 comprises a spring holder area 23. Furthermore, the first side

connecting rod 21 comprises first holes 24. In one example, the spring holder may be a shaft with slot, welded to first side connecting rod 21.
[57] The first side connecting rod assembly 20 further comprises a backrest spring tab 25 as shown in FIG. 3. Referring to and 3B, a perspective view of the backrest spring tab 25 is shown. The backrest spring tab 25 comprises a spring tab 26. The spring tab 25 is provided substantially at right angle with respect to structure of the backrest spring tab 25. Further, the backrest spring tab 25 comprises a second revolute joint area 27. Furthermore, the backrest spring tab 25 comprises a second hole 28. The backrest spring tab 25 is coupled to the first side connecting rod 21 as shown in FIG. 3C. In one implementation, the backrest spring tab 25 is welded to the first side connecting rod 21. Specifically, the backrest spring tab 25 is welded to the first side connecting rod 21 in such a way that the first revolute joint bearing area 22 is in axis with the second revolute joint area 27 and the spring holder area 23 is in axis with the second hole 28.
[58] Further, the first side connecting rod assembly 20 comprises a return spring 30. Referring to and 3D, a front view of the return spring 30 is shown. The return spring 30 comprises a first end 31 and a second end 32. The first end 31 is coupled to the spring tab 26 and the second end 32 is coupled to the first side tube connector 76. Referring to FIG. 3E, a cross-sectional view showing the return spring 30 coupled to the backrest spring tab 25 and the first side tube connector 76. After coupling the return spring 30 to the first side tube connector 76 and the spring tab 26, a shank bolt 33 is used to secure the first side connecting rod assembly 20. Specifically, the shank bolt 33 is made to pass through the first side tube connector 76, the first revolute joint bearing area 22 and the second revolute joint area 27. In one example, the spring 30 and first side tube connector 76, and first side connecting rod 21 may be connected by riveting, welding or fastening methods.
[59] Now, referring back to FIG. 3, the retracting assembly 10 comprises the second side connecting rod 50. Referring to FIG. 3F, a perspective view of the second side connecting rod 50 is shown, in accordance with one embodiment of the present disclosure. The second side connecting rod 50 comprises a third revolute joint area 51 and third holes 52.
[60] In order to couple the second side connecting rod 50 to the backrest support structure 70, a set screw 60 may be used, as shown in FIG. 3. Further, the set screw 60 is locked using

a socket head 62. Subsequently, the lock tube 80 is placed on the backrest support structure 70 and the second side connecting rod 50. Referring to FIG. 3G, the lock tube 80 is shown. The lock tube 80 comprises a fourth hole 82 having inner surface similar to outer surface of the backrest support structure 70. Further, the lock tube 80 comprises a release knob 84 used to operate the lock tube 80. The release knob 84 may be made up of plastic or any other suitable material. In one example, the inner portion of the fourth hole 82 may have a metal tube (not shown) having an inner surface matching with the outer surface of the backrest support structure 70.
[61] In order to lock the retracting assembly 10 in upright position, the lock tube 80 is placed on the second side connecting rod 50 as shown in FIG. 4A. FIG. 4B shows a side view of the retracting assembly 10 comprising the lock tube 80 placed on the second side connecting rod 50. Further, the lock tube 80 is raised by pushing the release knob 84 in upward or downward direction thereby creating a vacuum/room between the fourth hole 82 and the second side connecting rod 50 of backrest support structure 70. Subsequently, the lock tube 80 is raised. During the process, considering that the lock tube 80 is raised from its position shown in FIG. 4A and 4B, the backrest support structure 70 is bent. Referring to FIG. 4C and 4D, a perspective view and a side view of the backrest support structure 70 rotated at 45 degree with respect to the second side connecting rod 50 are shown to describe the operation of backrest support structure. Further, the lock tube 80 is completely moved i.e., 90 degree with respect to the second side connecting rod 50, as shown in FIG. 4E. FIG. 4E and 4F show a perspective view and a side view of the backrest support structure 70 rotated at 90 degree with respect to the second side connecting rod 50.
[62] In one implementation, the retracting assembly 10 is coupled directly to a frame 90 of a two/three wheeler automotive (not shown) by any of means of mechanical coupling. In order to couple the retracting assembly 10 to the frame 90, at first, a slider bracket assembly 100 is coupled to the frame 90. Subsequently, the retracting assembly 10 is coupled to the slider bracket assembly 100.
[63] Referring to FIG. 5A, a perspective view of a slider bracket assembly 100 coupled to the frame 90 is shown. It should be understood that the slider bracket assembly 100 is coupled to the frame 90 at both sides to provide strength to the retracting assembly 10.

Referring to FIG. 5B, a rear view of a slider bracket assembly 100 coupled to the frame 90 is shown. Referring to FIG. 6, the frame 90 of the two/three wheeler automotive is shown.
[64] The slider bracket assembly 100 comprises a mounting plate 102. Referring to FIG. 7A, the mounting plate 102 is shown, in accordance with one embodiment of the present disclosure. The mounting plate 102 comprises chassis mounting holes 104. The chassis mounting holes 104 are used to mount the mounting plate 102 to the frame 90. Further, the mounting plate 102 comprises slider mounting holes 106. Further, the mounting plate 102 comprises trigger mechanism mounting holes 108. Furthermore, the mounting plate 102 comprises slider locating tabs 110.
[65] The slider bracket assembly 100 further comprises a trigger holder 115 as shown in FIG. 5A. Referring to FIG. 10, the trigger holder 115 is shown. As can be seen, the trigger holder 115 comprises a trigger guide slot 116. Further, the trigger holder 115 comprises trigger holder mounting holes 117.
[66] In one implementation, the trigger holder 115 is coupled to the mounting plate 102, as shown in FIG. 7C. Specifically, the trigger mechanism mounting holes 108 is aligned with the trigger holder mounting holes 117. In one example, the trigger holder 115 is coupled to the mounting plate 102 by means of welding, clamping or any other suitable mechanical means to attach two components.
[67] The slider bracket assembly 100 further comprises a slider mounting assembly 120 as shown in FIG. 8. Referring to FIG. 8A, an exploded view of the slider mounting assembly 120 is shown. As can be seen, the slider mounting assembly 120 comprises a lock plate 122, an upper rail 124, a lower rail 126, a pair of retainer assemblies 128. The lock plate 122 comprises lock holes 123 provided in a series as shown in FIG. 8A. Further, the lock plate 122 comprises mounting rod holes 127 used to mount the first side connecting rod 21. Each of the retainer assemblies 128 comprises a steel roller 130 and steel balls 132 to facilitate vertical movement of the retainer assembly within the lower rail 126.
[68] The slider mounting assembly 120 is coupled to the trigger holder 115. In order to couple the slider mounting assembly 120 to the trigger holder 115; the lower rail 126 is placed on the trigger holder 115. Subsequently, rivets 135 are used to lock the lower rail 126

to the trigger holder 115, as shown in FIG. 9A. Referring to FIG. 9B, the slider mounting assembly 120 coupled to the trigger holder 115 and the mounting plate 102 is shown.
[69] In order to control movement of the slider mounting assembly 120, a slider locking mechanism assembly 140 is used, as shown in FIG. 5A. Referring to FIG. 10, an enlarged view of the slider locking mechanism assembly 140 is shown. The slider mechanism assembly 140 comprises a trigger knob 142, a trigger spring 144, a spring collar 146, and a trigger 148. The trigger knob 142 is provided to operate the slider mechanism assembly 140. The spring collar 146 is provided to allow the spring to operate within the space provided in the trigger holder 115.
[70] Referring to FIG. 11, configuration of the trigger 148 is explained. The trigger 148 comprises snap fits tabs 150, trigger guide surfaces 152, trigger travel stoppers 154, and trigger teeth 156.
[71] In order to assemble the slider locking mechanism assembly 140 with the trigger holder 115, the trigger spring 144 and the spring collar 146 are placed within the trigger holder 115. Referring to FIG. 12, an exploded view of the slider mechanism assembly 140 aligned in the axis with the trigger holder 115 and the lock plate 122. Subsequently, the trigger 148 is placed from the bottom of the trigger holder 115 such that the trigger teeth 156 are placed within the lock holes 123 provided in the lock plate 122. Subsequently, the trigger knob 142 is brought through trigger guide slot 116 to lock with the trigger 148. Due to the structure of the snap fit tabs 150, the trigger knob 142 passes through the structure of the trigger 148 and stops at the end of the trigger travel stoppers 154. Referring back to FIG. 10, the slider mechanism assembly 140 locked with the trigger holder 115 is shown, in accordance with one embodiment of the present disclosure. In order enable sliding of the slider mechanism assembly 140, the trigger knob 142 is pressed. Upon pressing the trigger knob 142, the trigger spring 144 pushes the trigger 148 thereby releasing the trigger teeth 156 from the lock holes 123. Subsequently, the trigger knob 142 is used to slide the slider mechanism assembly 140 such that the trigger teeth 156 are locked with another set of lock holes 123 provided on the lock plate 122. It is implied that current disclosure is not limited to the proposed slider mechanism assembly and it may be of any form and any type of locking mechanism.

[72] After completing the assembly of the slider mechanism assembly 140 with the trigger holder 115, the mounting plate 102 is coupled to the frame 90. Specifically, the chassis mounting holes 104 are used to mount the mounting plate 102 to the frame 90. In one example, the mounting plate 102 is coupled to the frame 90 by means of welding, clamping, or bolts and so on.
[73] In one implementation, the retracting assembly 10 is affixed to a seat cushion 170. The seat cushion 170 may be used to provide backrest support. Referring to FIG. 13A, and 13B, the backrest support structure 70 coupled to the seat cushion 170 is shown, in accordance of one embodiment of the present disclosure.
[74] Further, the retracting assembly 10 with the seat cushion 170 may be affixed to the frame 90. In order to affix the retracting assembly 10 with the seat cushion 170 to the frame 90, the retracting assembly 10 is brought close to the upper rail 124 from top position to place the retracting assembly 10 in the slider bracket assembly 100, as shown in FIG. 14A. The retracting assembly 10 is placed from top such that the third holes 52 of the second side connecting rod 50 comes in axis with lock holes 123 provided on the lock plate 122. Similarly, the second side connecting rod 50 comes in axis with lock holes 123 provided on the lock plate 122 on second side. It should be understood that the slider locking mechanism assembly 140 may be provided at both sides of the frame or only at one side as shown in FIG. 14B.
[75] Referring to FIG. 15A, the retracting assembly 10 with the seat cushion 170 affixed to a two/three wheeler automotive 175 is shown. As known, the two/three wheeler automotive 175 comprises a seat 180. In one implementation, the seat cushion 170 is positioned on the seat 180 of the two/three wheeler automotive 175, as shown in FIG. 15B. In order to enable the seat cushion 170 to use as a backrest support for a rider of the two/three wheeler automotive 175, the rider may have to manually lift the seat cushion 170. When the rider lifts the seat cushion 170, the lock tube 80 falls down on to the second side connecting rod 50 (as shown in FIG. 4A and 4B) and the backrest support structure 70 comes at substantially right angle to the second side connecting rod 50 thereby keeping the seat 180 at upright position.

[76] Due to the design of the retracting assembly 10, the seat cushion 170 may be rotated or lifted up to 100 degrees from its initial position, as shown in FIG. 15A. When the seat cushion 170 is lifted or rotated, the recliner assembly 10 gets locked ensuring that the seat cushion 170 stays firmly at the position as shown in FIG. 17A.
[77] In order to push back or fall back the seat 180 on to the position as shown in FIG. 15B, the rider may lift the release knob 84 such that the lock tube 80 is lifted. Subsequently, due to the structure of the return spring 30, the return spring 30 pushes the lock tube structure 70 or the seat 180 to the position shown in FIG. 15B.
[78] In one implementation, the slider bracket assembly 100 with the slider mechanism assembly 140 is used to increase height of the retracting assembly 10 such that the rider may adjust the height of the seat 180. In order to adjust the height of the seat 180, the rider may press the trigger knob 142. Upon pressing the trigger knob 142, the trigger spring 144 pushes the trigger 148 thereby releasing the trigger teeth 156 from the lock holes 123. Subsequently, the trigger knob 142 is used to slide the slider mechanism assembly 140 such that the trigger teeth 156 are locked with another set of lock holes 123 provided on the lock plate 122. When the trigger teeth 156 are locked with another set of lock holes 123, the seat 180 is raised from its position. If the rider wishes to use the seat 180 as backrest support, then the rider may have to manually lift the seat cushion 170. When the rider lifts the seat cushion 170, the lock tube 80 falls down on to the second side connecting rod 50 (as shown in FIG. 4A and 4B) and the backrest support structure 70 comes at substantially right angle to the second side connecting rod 50 thereby keeping the seat 180 at upright position.
[79] In another implementation, a retracting assembly 200 for providing backrest support on a two/three wheeler automotive (not shown) is disclosed, as shown in FIG. 16. Referring to FIG. 16, a perspective view of the retracting assembly 200 is shown, in accordance with one embodiment of the present disclosure. The retracting assembly 200 comprises a third side connecting rod assembly 220 and a fourth side connecting rod assembly 250. The retracting assembly 200 further comprises a backrest support structure 270 coupled to the third side connecting rod assembly 220 at one end and the fourth side connecting rod assembly 250 at another end. In one example, the backrest support structure 270 may be made up of a plastic, or a stainless steel, or aluminium. It should be understood that the backrest support structure

270 may comprise a hollow structure or a rigid structure. The backrest support structure 270 comprises a frame support bracket 272. The frame support bracket 272 may be made up of a plastic, or a stainless steel, or aluminium. The frame support bracket 272 is provided to strengthen the backrest support structure 270. Further, the backrest support structure 270 comprises stay brackets 274. The stay brackets 274 may be made up of a plastic, or a stainless steel, or aluminium. In one example, the stay brackets 274 are welded to the backrest support structure 270. The function of stay brackets 274 is explained at subsequent portion of the description.
[80] The third side connecting rod assembly 220 comprises a third side connecting rod 221 as shown in FIG. 16. The third side connecting rod 221 comprises a third revolute joint bearing area (not shown). Further, the third side connecting rod 221 comprises a spring holder area (not shown). Furthermore, the third side connecting rod 221 comprises fifth holes (not shown). The third side connecting rod assembly 220 further comprises a return spring 222 coupled to the third side connecting rod 221 and the third side tube connector 276, as shown in FIG. 16.
[81] Referring to FIG. 17A and 17B, a perspective and an exploded view of the backrest support structure 270 is shown, respectively, in accordance with one embodiment of the present disclosure. As can be seen, the backrest support structure 270 comprises the frame support bracket 272 and the stay brackets 274. Further, the backrest support structure 270 comprises a third side tube connector 276 at one end. Further, the backrest support structure 270 comprises a fourth side tube connector 278 at another end. Each of the third side tube connector 276 and the fourth side tube connector 278 is made up of aluminium, stainless steel, or any suitable material. The third side tube connector 276 is coupled to the third side connecting rod assembly 220. Similarly, the fourth side tube connector 278 is coupled to the fourth side connecting rod assembly 250. Further, the fourth side tube connector 278 comprises a guide bush 280. In one example, the guide bush 280 may be welded to the fourth side connecting rod 278.
[82] Referring back to FIG. 16, the return spring 222 comprises a third end (not shown, similar to first end 31) and a fourth end (not shown, similar to second end 32). The third end is coupled to the third side tube connector 276, as shown in FIG. 16. The fourth end is coupled to the third side connecting rod 221.

[83] After coupling the return spring 222 to the third side tube connector 276 and third side connecting rod 221, a shank bolt (not shown) is used to secure the third side connecting rod assembly 220. Specifically, the shank bolt is made to pass through the third side tube connector 276 and the third revolute joint bearing area provided in the third side connecting rod 221.
[84] Referring to FIG. 18A, 18B and 18C, construction of the fourth side connecting rod assembly 250 is explained. the Referring to FIG. 18B, the fourth side connecting rod assembly 250 comprising a fourth side connecting rod 251 is shown. The fourth side connecting rod 251 comprises sixth holes 252, travel stoppers 253, a first pin hole 255, a second pin hole 256, and a revolute joint hole 258. The travel stoppers 253 may be provided at an angle of 80-130 degrees.
[85] Referring back to FIG. 18A, the fourth side connecting rod 251 is coupled to the fourth side tube connector 278 using the revolute joint hole 258. As can be seen, the fourth side tube connector 278 comprises a spring tab 282. In one implementation, a lock pin 284 is inserted through the guide bush 280 provided on the fourth side tube connector 278. Subsequently, a lock screw 286 is used to secure the fourth side connecting rod 251 to the fourth side tube connector 278 as shown in the FIG. 18A.
[86] Referring to FIG. 18C, a rear view of the fourth side connecting rod assembly 250 is shown, in accordance with one embodiment of the present disclosure. The fourth side connecting rod assembly 250 further comprises a lever 260 coupled to the fourth side connecting rod 251 through the fourth side tube connector 278. In order to connect the lever 260 to the fourth side connecting rod 251 or the fourth side tube connector 278, a lever spring 262, a lever spacer 264 and a lever shaft 268 are used, as shown in FIG. 18C.
[87] Referring to FIG. 17B and 18C, the fourth tube connector 278 comprising pivot points 288 are shown. In order to couple the lever 260 to the fourth side tube connector 278, the lever shaft 268 is inserted through the pivot points 288 provided on the fourth side tube connector 278. Subsequently, the lever shaft 268 is drawn through the lever spacer 264 and the lever spring 262. The lever shaft 268 comprises a blind hole (not shown) at one end which

gets expanded after drawing through the pivot points 288 such that the lever shaft 268 gets locked at the pivot points 288.
[88] Referring to FIG. 19A, a perspective view of the retracting assembly 200 in operation is shown. Further, referring to FIG. 19B, a cross-sectional view of the lever 260 coupled to the fourth side connecting rod 251 is shown. Further, FIG. 19C shows a cross-sectional side view of the fourth side connecting rod 251 comprising the lock pin 284 in the first pin hole 255. As can be seen, the lock pin 284 is coupled to the lever 260 and the lock pin 284 is placed in the first pin hole 255. In order to release the lock pin 284 from the first pin hole 255, the lever 260 may be pressed towards the fourth side connecting rod 251 thereby pulling the lock pin 284 away from the first pin hole 255. In other words, when the lever 260 is pressed, the lever spring 262 pushes bottom part of the lever 260, which in turn pulls the lock pin 284 away from the first pin hole 255.
[89] Now referring to FIG. 20A and 20B, operation of the retracting assembly 200 is explained. In order to lock the backrest support structure 270 at upright position, the lock pin 284 is made to sit inside the first pin hole 255. In order to lower the backrest support structure 270 to 90 degree with respect to the fourth side connecting rod 251, the lever 260 is pushed thus releasing the lock pin 284 from the first pin lock 255. Due to the structure of the return spring 222 provided on the third side connecting rod assembly 220, the return spring 222 pushes the backrest support structure 270 to position shown in FIG. 20B. When the backrest support structure 270 is lowered, the fourth side tube connector 278 also rotates to about 90 degrees. As shown in FIG. 20A and 20B, the fourth side tube connector 278 comprises the spring tab 282. When the fourth side tube connector 278 rotates with the backrest support structure 270, then the movement of the fourth side tube connector 278 is stopped when the spring tab 282 reaches other end of the travel stoppers 253.
[90] When the spring tab 282 reaches other end of the travel stoppers 253, the lock pin 284 comes in the axis of the second pin hole 256. After lowering the backrest support structure 270 to the position shown in the FIG. 20B, the lever 260 is released and the lock pin 284 gets locked inside of the second pin hole 256.

[91] In order to keep the backrest support structure substantially at 180 degree with respect to the fourth side connecting rod 252, the rider of the two/three wheeler automotive may press the lever 260 and manually lift the backrest support structure 270 to the position as shown in FIG. 20A.
[92] The retracting assembly 200 may also be provided with a seat cushion (not shown, similar to seat cushion 170 shown in FIG. 13A) and the retracting assembly 200 may be coupled to the frame of the two/three wheeler automotive using the bracket/sliding assembly shown in FIG. 5A.
[93] As can be noted from the above description, the retracting assembly (10, 200) is positioned such that the rider may manually lift the seat cushion 170 to use the seat cushion 170 as the backrest support. Further, in order to disengage the retracting assembly/seat cushion 10 to its position, the rider may actuate the lock tube 80 or the lever 260 and the retracting assembly 10 retracts to its original position without further manual effort. Further, the retracting assembly 10, 200 height may be adjusted using the slider assembly 100 provided at the frame.
[94] Further, the length of the backrest support structure 70 may be selected based on need of the rider. In addition, the seat cushion 180 of different design may be selected by the rider based on comfort the rider chooses.
[95] Although implementations of a retracting assembly have been described in language specific to structural features, it is to be understood that the appended claims are not necessarily limited to the specific features described. Rather, the specific features are disclosed as examples of implementations for retracting assembly providing backrest support on a two/three wheeler automotive.

Reference Numerals:
Retracting Assembly 10
First Side Connecting Rod Assembly 20
First Side Connecting Rod 21
First Revolute Joint Bearing Area 22
Spring Holder Area 23
First Holes 24
Backrest Spring Tab 25
Spring Tab 26
Second Revolute Joint Area 27
Second Hole 28
Return Spring 30
First End 31
Second End 32
Shank Bolt 33
Second Side Connecting Rod 50
Third Revolute Joint Area 51
Third Holes 52
Set Screw 60
Socket Head 62
Backrest Support Structure 70
Frame Support Bracket 72
Stay Brackets 74
Lock Tube 80
Fourth Hole 82
Release Knob 84

First Side Tube Connector 76
Second Side Tube Connector 78
Frame 90
Slider bracket assembly 100
Mounting Plate 102
Chassis Mounting Holes 104
Slider Mounting Holes 106
Trigger Mechanism Mounting Holes 108
Slider Locating Tabs 110
Trigger Holder 115
Trigger Guide Slot 116
Trigger Holder Mounting Holes 117
Slider Mounting Assembly 120
Lock Plate 122
Lock Holes 123
Mounting Rod Holes 127
Upper Rail 124
Lower Rail 126
Retainer Assemblies 128
Steel Roller 130
Steel Balls 132
Rivets 135
Slider Mechanism Assembly 140
Trigger Knob 142
Trigger Spring 144
Spring Collar 146

Trigger 148 Snap Fits Tabs 150 Trigger Guide Surfaces 152 Trigger Travel Stoppers 154 Trigger Teeth 156 Seat Cushion 170 two/three wheeler automotive 175 Seat 180
Retracting Assembly 200 Third Side Connecting Rod Assembly 220 Return Spring 222
Fourth Side Connecting Rod Assembly 250 Fourth Side Connecting Rod 251 Sixth Hole 252 Travel Stoppers 253 First Pin Hole 255 Second Pin Hole 256 Revolute Joint Hole 258 Lever 260 Lever Spring 262 Lever Spacer 264 Lever Shaft 268 Backrest Support Structure 270 Frame Support Bracket 272 Stay Brackets 274 Third Side Tube Connector 276 Fourth Side Tube Connector 278

Guide Bush 280 Spring Tab 282 Lock Pin 284 Lock Screw 286 Pivot Points 288

WE CLAIM:
1. A retracting assembly (10, 200), comprising:
a backrest support structure (70, 270);
a first side connecting rod assembly (20, 220) and a second side connecting rod (50, 250) coupled to the backrest support structure (70, 270), wherein the first side connecting rod assembly (20, 220) and the second side connecting rod (50, 250) are coupled to a frame (90) of a two/three wheeler automotive (175),
wherein the first side connecting rod assembly (20, 220) comprises a return
spring (30, 222) to facilitate rotation of the backrest support structure (70, 270);
wherein the second side connecting rod (50, 250) comprises a locking
mechanism (80, 260) to lock movement of the backrest support structure (70, 270)
with respect to the second side connecting rod (50, 250); and
a slider assembly (140) coupled to the frame (90), substantially in perpendicular, to facilitate raising and lowering of the first side connecting rod assembly (20, 220) and the second side connecting rod (50, 250).
2. The retracting assembly (10) as claimed in claim 1, wherein locking mechanism (80) comprises a lock tube (80) for locking the backrest support structure (70) with respect to the second side connecting rod (50).
3. The retracting assembly (200) as claimed in claim 1, wherein locking mechanism (260) comprises a lever (260) for locking the backrest support structure (270) with respect to the second side connecting rod (250).
4. The retracting assembly (10) as claimed in claim 1, wherein the slider assembly comprises a trigger holder assembly, wherein the slider locking mechanism is used to facilitate raising and lowering of the first side connecting rod assembly (20) and the second side connecting rod (50).
5. The retracting assembly (10) as claimed in claim 1, wherein the slider locking mechanism comprises rails and retainer assembly.

6. The retracting assembly (10) as claimed in claim 1, wherein the slider locking mechanism a trigger and a release knob to release and lock the slider assembly.
7. The retracting assembly (10) as claimed in claim 1, wherein the cut portion (57) in the second side lower connecting rod (52) is provided at an angle ranging from 80 degree to 130 degree to facilitate retraction of the backrest support structure (70).
8. The retracting assembly (10) as claimed in claim 1, wherein the return spring is coupled to the backrest support structure at one end and to the first side connecting rod assembly (20) at another end.
9. The retracting assembly (10) as claimed in claim 1, wherein the backrest support structure (70) comprises a seat cushion (82).
10. The retracting assembly (200) as claimed in claim 3, wherein the lever mechanism (260) comprises a lock pin (284) and lock pin holes (255, 256) to lock and unlock the backrest support structure (270).