Multi-angle adjusting backrest device

Abstract

The utility model discloses a multi-angle adjusting backrest device which comprises a backrest, a switching mechanism, an angle locking mechanism and an elastic mechanism, the switching mechanism is connected between the backrest and a fixed object, the backrest can rotate around the rotating axis of the switching mechanism, the angle locking mechanism is arranged at the position of the backrest and / or the fixed object, and the elastic mechanism is arranged at the position of the angle locking mechanism. The locking device is used for locking the backrest so as to fix the backrest in a current locking state; the elastic mechanism is arranged at the position of the backrest or the fixed object, when the backrest is rotationally adjusted, the elastic mechanism is separated from the fixed object or the backrest, after the backrest is adjusted to the needed angle, the elastic mechanism returns to prompt that angle adjustment is completed, and after the angle of the backrest is adjusted in place, the elastic mechanism is positioned in the locking hole to prompt that adjustment is completed. And through one or more times of prompting, the user can clearly master the specific adjusted angle, the needed angle can be accurately adjusted, and the situation that adjustment is not in place or excessive is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle accessories, and in particular relates to a multi-angle adjustable backrest device. Background Art

[0002] Motorcycles, electric vehicles, and bicycles are common means of transportation. In order to improve the comfort and safety of the vehicles, people have designed backrests that can be connected to the frames to provide support behind the drivers or passengers. The backrests currently used can be rotated to adjust the angle after being installed on the frames. However, during the process of adjusting the support angle, the user cannot accurately know the specific angle to be adjusted, so it is easy to make inadequate adjustments or over-adjustments. Utility Model Content

[0003] In view of the technical problem in the prior art that the user cannot accurately know the specific angle to be adjusted, the utility model provides a multi-angle adjustable backrest device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A multi-angle adjustable backrest device, comprising:

[0006] Backrest;

[0007] A transfer mechanism is connected between the backrest and the fixed object, and the backrest can rotate around the rotation axis of the transfer mechanism;

[0008] An angle locking mechanism, disposed at the backrest and / or the fixed object, for locking the backrest so that the backrest is fixed in a current locking state; and

[0009] The elastic mechanism is arranged at the backrest or the fixed object. When the backrest is rotated to adjust, the elastic mechanism is separated from the fixed object or the backrest. After the backrest is adjusted to the required angle, the elastic mechanism returns to its original position to indicate that the angle adjustment is completed.

[0010] Furthermore, the angle locking mechanism comprises:

[0011] A plurality of locking holes are arranged to be distributed on the fixed object or the backrest in a ring or arc shape around the rotation axis as the center; and

[0012] The locking piece is arranged at the backrest or the fixed object and can extend into and exit from the locking hole along the rotation axis direction.

[0013] Furthermore, the backrest or the fixed object is provided with a through hole opened along the rotation axis direction; the locking element includes:

[0014] A locking pin, movably inserted into the through hole;

[0015] A third reset spring, disposed in the through hole and capable of pushing the locking pin retracted into the through hole towards the locking hole; and

[0016] A locking handle, disposed outside one side of the backrest or the fixed object away from the locking hole, and connected to one end of the locking pin away from the locking hole.

[0017] Further, the fixed object includes two connecting plates arranged at intervals, and each of the connecting plates is provided with the plurality of locking holes;

[0018] The branch arms of the backrest are respectively provided with connecting parts corresponding to the positions of the two connecting plates. Each connecting part is provided with a through hole for connecting the lock. The lock is rotatably connected to the through hole and the locking handle is located outside the branch arm. When the locking handle is perpendicular to the branch arm, the locking pin can lock the connecting plate. When the locking handle rotates in a direction away from the through hole, the locking pin can disengage from the connecting plate.

[0019] Further, the locking pin includes a pin head connected to the connecting plate, a pin rod fixedly connected to the pin head, and a support rod vertically connected to the pin rod. The locking handle is axially connected to the support rod and rotates around the support rod.

[0020] Further, the locking handle includes a handle, a handle head fixedly connected to the handle, and a receiving notch provided on the handle head for receiving the pin rod. The outer wall of the handle head has two opposite smooth cut surfaces. The receiving notch is distributed between the two smooth cut surfaces. Each smooth cut surface is provided with a mounting hole penetrating into the receiving notch for mounting the support rod, and the mounting hole can rotate around the support rod.

[0021] Further, the backrest includes a backrest body and a connecting arm detachably connected to the backrest body. The connecting arm includes a telescopic arm and an arm main body in which the telescopic arm is movably installed. The telescopic arm can reciprocate inside the arm main body. One end of the telescopic arm away from the backrest body is provided with a first mounting groove for mounting an elastic member, and a second mounting groove connected to the elastic member is provided at a position corresponding to the elastic member inside the arm main body. The arm main body is connected with a telescopic locking mechanism for locking the position of the telescopic arm; when the telescopic arm is in the original non-telescopic state, the elastic member is in a stretched state to store elastic force, and when the locking of the telescopic locking mechanism is unlocked, the elastic member can drive the telescopic arm to move away from the arm main body.

[0022] Further, the elastic member is a constant-force spring with a T-shaped clamping portion at one end, the first installation groove is an arc groove adapted to the outer peripheral surface of the constant-force spring, and the second installation groove is cooperatively connected with the T-shaped clamping portion.

[0023] Further, the radian and spacing between the elastic mechanism and the locking member are adapted to the radian and spacing of any two adjacent locking holes. When the locking member passes through one of the locking holes, the elastic mechanism abuts against another adjacent locking hole and is limited by the other locking hole.

[0024] Further, the elastic mechanism includes an embedding member embedded in the backrest or the fixed object, a second return spring installed in the inner cavity of the embedding member, and a positioning bead that abuts against the second return spring and is partially exposed outside the embedding member. When the locking member passes through one of the locking holes, when the spherical surface of the positioning bead enters another adjacent locking hole, it collides with the edge of the other adjacent locking hole to indicate that the backrest is fixed at the current angle.

[0025] In summary, the beneficial effects of the multi-angle adjustable backrest device of the present invention are as follows: First, the connecting arm is connected to the two-wheeled vehicle through the connecting frame. By rotating the locking handle, the pin head can withdraw from the locking hole, and the connecting arm can be rotated to achieve angle adjustment. After the third return spring drives the pin head to return to its position, the position of the locking connecting plate is locked, and the connecting arm can be adjusted in the pitching angle as needed. Second, during the process of rotating and adjusting the connecting arm, the positioning bead in the elastic mechanism can enter and exit the locking hole, and during the positioning process, it collides with the edge of the locking hole. The adjustment gears are clear and obvious, and there is an obvious adjustment feel. After the distances between each locking hole are equal, by counting the number of times of positioning by the elastic mechanism, the specific adjustment angle can be known during each adjustment process, avoiding the situation of under-adjustment or over-adjustment. Third, the backrest body can be disassembled from the connecting arm, which is convenient for replacing the backrest body when it is worn or out of style. Moreover, in the way of sliding-in assembly, when disassembling and replacing, the backrest body and the slider can be quickly positioned, and the whole replacement and assembly process is simple, fast and easy to operate. Fourth, the periphery of the slider is pressed by the covering portion and the pressing portion to form a stable and firm fixing structure, which increases the support strength at the connection after being limited. Fifth, the first angle adjustment mechanism can adjust the pitching angle of the backrest body according to the actual situation of the user, so that the use surface of the backrest body can support and rely on people more fittingly. After the angle of the pitching angle adjustment part is adjusted, it is locked by two knob bodies. The third tooth parts on the two knob bodies can mesh more tightly with the first tooth part and the second tooth part, improving the locking effect and being more firm and reliable when locking the angle. Sixth, the connecting arm can also be adjusted in length. According to the different lengths required by different users for the backrest body, the telescopic arm can be adjusted to reciprocate in the arm main body, and then the position of the telescopic arm is locked through the telescopic locking mechanism to complete the adjustment of the length of the connecting arm. Description of the Drawings

[0026] Figure 1 It is a schematic structural view of a multi-angle adjustable backrest device provided by the present utility model.

[0027] Figure 2 It is a schematic structural view of the backrest body without installing a slider in the present utility model.

[0028] Figure 3 It is a front projection view of the backrest body after installing a slider in the present utility model.

[0029] Figure 4 It is Figure 3 a sectional view taken along the A-A direction of

[0030] Figure 5 It is a schematic perspective view of the limit block in the present utility model.

[0031] Figure 6 It is a top view of the backrest in the present utility model.

[0032] Figure 7 It is Figure 6 a sectional view taken along the B-B direction of

[0033] Figure 8 It is Figure 7 a partial enlarged view of part A of

[0034] Figure 9 It is a schematic structural view of the first angle locking part in the present utility model.

[0035] Figure 10 It is a schematic structural view of the second angle locking part in the present utility model.

[0036] Figure 11 It is a top view of the telescopic arm in the present utility model.

[0037] Figure 12 It is a vertical sectional view of the telescopic locking mechanism in the present utility model.

[0038] Figure 13 It is a sectional view of the second angle locking mechanism in the present utility model.

[0039] Figure 14 It is a schematic structural view of the connecting part in the present utility model.

[0040] Figure 15 It is a schematic structural view of the connecting plate in the present utility model.

[0041] Figure 16 It is a schematic structural view of the locking part in the present utility model.

[0042] Figure 17 It is a sectional view of the elastic mechanism in the present utility model.

[0043] In the figure, 100 - backrest body, 110 - cushion, 120 - U-shaped chute, 121 - retaining wall, 1210 - covering part, 122 - second reinforcing hole, 130 - limiting block, 131 - limiting main body, 1310 - first reinforcing hole, 132 - pressing part, 1320 - restricted part, 140 - reinforcing bolt, 141 - convex part, 200 - connecting arm, 210 - telescopic arm, 211 - arm head, 2110 - connecting wing, 2110A - connecting position, 212 - arm rod, 220 - arm main body, 221 - branch arm, 2210 - connecting part, 2210A - through hole, 2210B - material-saving groove, 300 - slider, 310 - pitching angle adjusting part, 400 - first angle locking mechanism, 410 - first angle locking part, 411 - first locking cavity, 412 - first tooth part, 413 - guiding groove, 4130 - reinforcing rib, 414 - first through hole, 420 - second angle locking part, 421 - second locking cavity, 422 - second tooth part, 423 - annular flange, 424 - second through hole, 430 - angle locking knob, 431 - knob body, 432 - third tooth part, 440 - return spring, 500 - telescopic locking mechanism, 510A - annular protrusion, 510B - first fitting cavity, 510C - third fitting cavity, 510D - stepped groove, 520 - telescopic fitting part, 520A - first fitting space, 520B - second fitting space, 530A - locking button, 530B - spring sleeve section, 530C - first fitting section, 530D - first limiting section, 530E - second fitting section, 530F - second limiting section, 530H - tail section, 540 - first return spring, 600 - adapter shaft, 610 - limiting nut, 620 - covering part, 700 - connecting plate, 710 - locking hole, 800 - locking part, 810 - locking pin, 811 - pin head, 812 - pin rod, 813 - support rod, 820 - third return spring, 830 - locking handle, 831 - handle, 832 - handle head, 8320 - smooth cut surface, 833 - receiving notch, 900 - elastic mechanism, 910 - embedding part, 920 - second return spring, 930 - positioning bead. Detailed implementation mode

[0044] The present utility model will be further described below in conjunction with specific drawings.

[0045] Please refer to Figure 1The utility model provides a multi-angle adjustable backrest device, including a backrest, a transfer mechanism connected between the backrest and a fixed object, a transfer mechanism arranged at the backrest and / or the fixed object, used to lock the backrest so that the backrest is fixed in a current locked state, and an elastic mechanism, which is arranged at the backrest or the fixed object. When the backrest is rotated to adjust the backrest, the elastic mechanism is separated from the fixed object or the backrest. After the backrest is adjusted to the required angle, the elastic mechanism returns to its position to indicate that the angle adjustment is completed.

[0046] In a preferred embodiment, the backrest includes a backrest body 100 and a connecting arm 200 detachably connected to the backrest body 100. The connecting arm 200 includes a telescopic arm 210 and an arm body 220 in which the telescopic arm 210 is movably mounted.

[0047] Please continue reading Figure 1 and Figure 14 The preferred structure of the arm body 220 is as follows: the end of the arm body 220 away from the arm head 211 has two symmetrically arranged branch arms 221, each branch arm 221 is provided with a connecting portion 2210, and the connecting portion 2210 is provided with a plurality of material-saving grooves 2210B recessed toward the inner direction of the branch arm 221, and the material-saving grooves 2210B are used to save production materials and also have the function of reducing deadweight. The connecting portion 2210 can connect the connecting arm 200 to a fixed object through a switching mechanism, and the fixed object preferably adopts a connecting frame, and the connecting frame has connecting plates 700 corresponding to the position of the connecting portion 2210, and the two connecting plates 700 are connected by a connecting main board. The connecting main board is used to be detachably connected to the frame of a motorcycle or electric vehicle, so that the backrest device can be installed on a two-wheeled vehicle driven by a user.

[0048] See also Figure 13 In a preferred embodiment, the adapter mechanism is connected between the branch arm 221 and the fixed object, and the branch arm 221 can rotate around the rotation axis of the adapter mechanism. The adapter mechanism has an adapter shaft 600, one end of which is inserted through the position of the connecting plate 700. The branch arm 221 is rotatably connected to the connecting plate 700 through the adapter shaft 600 and can rotate around the axis of the adapter shaft 600. The connecting portion 2210 and the connecting plate 700 are both provided with an axial hole for the adapter shaft 600 to pass through. After the adapter shaft 600 is rotatably connected in the axial hole, the position of the adapter shaft 600 is limited by a limit nut 610 threaded with the adapter shaft 600 to prevent the adapter shaft 600 from falling off. In order to make the appearance more beautiful, the limit nut 610 is distributed on the inner side of the branch arm 221. The adapter shaft 600 is also connected to a cover 620 to cover the connecting plate 700 and the connecting portion 2210. The connecting plate 700 is located between the cover 620 and the connecting portion 2210, making the appearance of the connecting position more beautiful, and the cover 620 can protect the angle locking mechanism and elastic mechanism 900 set at the corresponding position.

[0049] In a preferred embodiment, the angle locking mechanism is disposed at the branch arm 221 and / or the fixed object (connecting plate 700) for locking the backrest so that the backrest is fixed in the current locked state. The angle locking mechanism capable of locking the angle between the connecting arm 200 and the fixed object is defined as the second angle locking mechanism. The second angle locking mechanism includes a plurality of locking holes 710 and a locking member 800. The plurality of locking holes 710 can be configured to be distributed in a circular or arc shape around the rotation axis at the fixed object or the branch arm 221. In one embodiment, the plurality of locking holes 710 are distributed on the connecting plate 700. The locking member 800 is disposed at the backrest or the fixed object and can extend into and withdraw from the locking hole 710 along the rotation axis direction. The second angle locking mechanism can be used to adjust the pitching angle of the connecting arm 200, so that the backrest device has more and more flexible functions. In addition to this structure, a parallel manner or the like can also be adopted to support the corresponding upper claim.

[0050] Specifically, in one embodiment, a through hole 2210A for installing the locking member 800 is opened in the connecting portion 2210. The through hole 2210A is arranged along the rotation axis direction. Please continue to refer to Figure 13 , the locking member 800 includes a locking pin 810 movably inserted into the through hole 2210A, a third return spring 820 disposed in the through hole 2210A and capable of pushing the locking pin 810 retracted into the through hole 2210A towards the locking hole 710, and a locking handle 830. The locking handle 830 is disposed outside the branch arm 221 on the side away from the locking hole 710 and is connected to one end of the locking pin 810 away from the locking hole 710. The fixed object includes two connecting plates 700 arranged at intervals. Please refer to Figure 15, a plurality of locking holes 710 are provided on each connecting plate 700. Connecting parts 2210 corresponding to the positions of the two connecting plates 700 are respectively provided on the branch arms 221 of the backrest. A through hole 2210A for connecting the locking member 800 is provided on each connecting part 2210. The locking member 800 is rotatably connected to the through hole 2210A such that the locking handle 830 is located outside the branch arm 221. The locking pin 810 includes a pin head 811 connected to the connecting plate 700, a pin rod 812 fixedly connected to the pin head 811, and a support rod 813 perpendicularly connected to the pin rod 812. The pin rod 812 is sleeved in the third return spring 820. The locking handle 830 is pivotally connected to the support rod 813 and rotates around the support rod 813. When the locking handle 830 is perpendicular to the branch arm 221, the locking pin 810 can lock the connecting plate 700. When the locking handle 830 rotates away from the through hole 2210A, the locking pin 810 can disengage from the connecting plate 700. The position of the locking connection arm 200 is locked by rotating the locking handle 830. The operation method is simple and fast, easy to operate, and can quickly adjust the angle of the connection arm 200. In addition to this structure, a parallel arrangement or the like can also be adopted to support the corresponding upper claim.

[0051] Please refer to Figure 16 , the locking handle 830 includes a handle 831, a handle head 832 fixedly connected to the handle 831, and a receiving notch 833 provided on the handle head 832 for receiving the pin rod 812. The outer wall of the handle head 832 has two opposite smooth sections 8320. The receiving notch 833 is distributed between the two smooth sections 8320. An installation hole for installing the support rod 813 is provided on each smooth section 8320, with one end penetrating into the receiving notch 833 and the other end penetrating out of the smooth section 8320. The installation hole can rotate around the support rod 813. The handle head 832 has a structure with a smaller outer diameter at both ends and a larger middle part, similar to an oval. A line segment ZA is horizontally extended from the axis of the installation hole, and a line segment ZB is extended from the axis of the installation hole to the end face away from the handle 831. The length of the line segment ZA is greater than the length of the line segment ZB. Therefore, after the locking pin 810 is installed in the through hole 2210A, the end of the handle head 832 away from the handle 831 abuts against the inner side of the branch arm 221. When the locking handle 830 is rotated along the support rod 813, the design that the length of the line segment ZA is greater than the length of the line segment ZB can prevent interference with the rotation of the locking handle 830 and enable the locking handle 830 to be smoothly withdrawn from the locking hole 710 by the pin head 811. The connecting plate 700 and the branch arm 221 are not locked, and the angle adjustment can be successfully completed. When the pin head 811 is withdrawn, the third return spring 820 is in a compressed state. At this time, the locking handle 830 is rotated to a state perpendicular to the branch arm 221, and the reset of the third return spring 820 can drive the pin head 811 to move into the locking hole 710 until the position of the locking hole 710 is locked. The operation is simple and convenient.

[0052] Grip the locking handle 830, and it is possible to operate to rotate the entire lock 800 within the through hole 2210A. Therefore, the rotation direction of the locking handle 830 can also be adjusted according to the actual operation situation.

[0053] In order to be able to prompt the successful completion of the angle adjustment, an elastic mechanism 900 is also provided. The elastic mechanism 900 is arranged at the backrest or the fixed object. When the backrest is rotated and adjusted, the elastic mechanism 900 is separated from the fixed object or the backrest. In a preferred embodiment, the elastic mechanism 900 is arranged at the position of the connecting portion 2210. After the backrest is adjusted to the required angle, the elastic mechanism 900 returns to its original position to prompt the completion of the angle adjustment. In order to facilitate the user to clearly know the specific angle being adjusted, the included angle between every two adjacent locking holes 710 is preferably 45°. The radian and spacing between the elastic mechanism 900 and the lock 800 are adapted to the radian and spacing of any two adjacent locking holes 710. When the lock 800 is inserted into one of the locking holes 710, specifically, the pin head 811 is inserted into one of the locking holes 710, the elastic mechanism 900 abuts against an adjacent another locking hole 710 and is limited by this another locking hole 710. When the branch arm 221 is rotated forward or backward, the elastic mechanism 900 can retract and separate from the connecting plate 700. After the adjustment is in place, the elastic mechanism 900 is positioned within the locking hole 710 to prompt the completion of the adjustment. By prompting once or multiple times, the user can clearly master the specific angle being adjusted, so as to accurately adjust to the required angle and reduce the occurrence of situations where the adjustment is not in place or over-adjusted.

[0054] Please refer to Figure 17 , the elastic mechanism 900 includes an embedding member 910 embedded in the backrest or the fixed object, a second return spring 920 installed in the inner cavity of the embedding member 910, and a positioning bead 930 that abuts against the second return spring 920 and is partially exposed outside the embedding member 910. In one embodiment, the elastic mechanism 900 is arranged at the position of the connecting portion 2210. When the lock 800 is inserted into one of the locking holes 710, when the spherical surface of the positioning bead 930 enters an adjacent another locking hole 710, it collides with the hole edge of the adjacent another locking hole 710 to prompt that the backrest is fixed at the current angle. During the process of adjusting the angle of the connecting arm 200, while the connecting arm 200 rotates forward or backward, the positioning bead 930 will be adapted to cooperate with the corresponding locking hole 710 to form a positioning. Every time the angle adjustment is completed, the positioning bead 930 will collide with the locking hole 710. The adjustment gears are clear and obvious, and each gear has an obvious tactile prompt, which is convenient for grasping the rotation angle of the branch arm 221 and the adjustment is accurate and in place. In addition to this structure, a parallel manner or the like can also be adopted to support the corresponding upper claims.

[0055] The backrest body 100 is provided with an assembly position having a sliding inlet and a limiting portion. The connecting arm 200 is provided with a slider 300 at a position corresponding to the assembly position, and the slider 300 can slide into the assembly position along the sliding inlet. After the slider 300 is assembled in the assembly position, the limiting portion is used to limit the slider 300 in the assembly position. The backrest body 100 can be disassembled from the connecting arm 200, which is convenient for replacing the backrest body 100 after it is worn or out of style. Moreover, in the way of sliding into the assembly, when disassembling and replacing, the backrest body 100 and the slider 300 can be quickly positioned, and the whole process is simple and fast.

[0056] One end of the backrest body 100 away from the assembly position has a cushion 110. For the convenience of the user, the contact surface of the cushion 110 is preferably an arc surface.

[0057] Please refer to Figure 2 , the assembly position includes a U-shaped chute 120 recessed in the direction of the interior of the backrest body 100. The opening of the U-shaped chute 120 forms a sliding inlet for the slider 300 to freely enter and exit. A retaining wall 121 for preventing the slider 300 from detaching from the backrest body 100 in the direction away from the backrest body 100 is formed at the side wall of the U-shaped chute. The retaining wall 121 has a covering portion 1210 that can partially cover the U-shaped chute 120. The bottom surface of the covering portion 1210 and the side wall of the U-shaped chute 120 can form an L-shaped assembly portion for slidably connecting with the slider 300. Please refer to Figure 3 and Figure 4 , when the slider 300 is assembled in the U-shaped chute 120, the covering portion 1210 can press against the outer surface of the slider 300. The two sides of the slider 300 cooperate with the L-shaped assembly portion, so that after the slider 300 is assembled in the U-shaped chute 120, the covering portion 1210 can press against the outer surface of the slider 300. This pressing action not only restricts the movement of the slider 300 in the horizontal direction, but also provides additional support in the vertical direction through the L-shaped structure of the L-shaped assembly portion, thereby enhancing the overall fixing effect. Due to the tight fit between the L-shaped assembly portion and the slider 300, the shaking of the slider 300 caused by external forces (such as vibration, impact, etc.) is reduced, and the stability and reliability of the entire assembly structure are improved. In addition, the presence of the L-shaped assembly portion makes the assembly process of the slider 300 simpler and faster. The user only needs to align the slider 300 with the sliding inlet and then push it along the U-shaped chute 120, without additional assembly steps or tools, greatly improving the assembly efficiency and enabling quick disassembly and assembly. The design of the retaining wall 121 and its covering portion 1210 effectively prevents the risk of the slider 300 falling off in the direction away from the backrest body 100 during the assembly process or use, improving the safety performance of the product.

[0058] The length of the two L-shaped assembly parts on the U-shaped slide groove 120 that are equal to the entry and exit direction of the slider 300 is greater than the length of the slider 300 in this direction. When the slider 300 slides into the bottom of the U-shaped slide groove 120, the two L-shaped assembly parts protrude out of the outside of the slider 300 in the direction of the sliding entrance. The two parts protruding out of the outside of the slider 300 respectively form two limiting spaces. The two limiting spaces are used to assemble the limiting parts. The covering part 1210 cooperates with the limiting parts to realize the closure of the sliding entrance. After closure, the slider 300 is surrounded inside, forming limits around the slider 300 to prevent the slider 300 from falling out.

[0059] The limiting portion can be configured as a limiting block 130 capable of closing the sliding entrance, and the limiting block 130 is detachably connected to the backrest body 100. The limiting block 130 has a limiting body 131 that blocks the outer side of the slider 300 along the entry and exit direction of the slider 300, and the limiting body 131 is detachably arranged at the sliding entrance. A plurality of first reinforcement holes 1310 are provided on the limiting body 131, and a plurality of second reinforcement holes 122 corresponding to each other are also provided at corresponding positions of the U-shaped slide groove 120, and the first reinforcement holes 1310 and the second reinforcement holes 122 are screwed together by reinforcement bolts 140. After the slider 300 is slidably connected to the L-shaped assembly portion, and the limiting body 131 is screwed with the reinforcement bolts 140, the limiting block 130 is more firmly fixed to the backrest body 100, and the stability of the connection between the backrest body 100 and the connecting arm 200 can be further improved.

[0060] In order to facilitate users to quickly and conveniently assemble the reinforcement bolt 140, the reinforcement bolt 140 has an outer protrusion 141 that can be exposed outside the first processing hole or the second reinforcement hole 122 after repeated assembly. By holding the outer protrusion 141, the reinforcement bolt 140 can be rotated to complete disassembly and assembly without the aid of other disassembly tools. The method of assembling the reinforcement bolt 140 is also very convenient and quick.

[0061] See also Figure 5 The limit block 130 also has a holding portion 132 connected to the limit body 131 and capable of holding the outer surface of the slider 300, and a limiting portion 1320 capable of extending into the limiting space along the in and out direction of the slider 300 is formed at both ends of the holding portion 132. The holding portion 132 can be configured to be connected end to end with the covering portion 1210 to form a frame-shaped structure, which is used to form a barrier around the outer surface of the slider 300 to prevent the slider 300 from detaching from the backrest body 100 in the direction away from the backrest body 100. When the limit block 130 is installed, the two sides of the limit block 130 are slidably assembled in the corresponding L-shaped assembly portion until the limiting portion 1320 is adapted to the limiting space, and the covering portion 1210 and the holding portion 132 form a frame-shaped structure capable of holding the slider 300 therein, which not only stably and firmly limits the slider 300, but also the frame-shaped structure covers the periphery of the slider 300, and the appearance is more beautiful.

[0062] The slider 300 has an angle adjustment part that can be rotatably connected to the connecting arm 200. The angle adjustment part can be configured as a pitch angle adjustment part 310 for adjusting the pitch angle of the backrest body 100 and / or a horizontal angle adjustment part for adjusting the horizontal angle of the backrest body 100. In the following, the pitch angle adjustment part 310 is taken as a specific example to exemplarily describe the angle adjustment part of the present utility model.

[0063] Please refer to Figure 6 , the connecting arm 200 has two connecting wings 2110 arranged horizontally at intervals. A connecting position 2110A for installing the pitch angle adjustment part 310 is formed between the two connecting wings 2110. For the convenience of assembling the connecting wing 2110 and the pitch angle adjustment part 310, one of the connecting wings 2110 can be fixedly connected to the connecting arm 200, and the other connecting wing 2110 can be screwed to the connecting arm 200 through a bolt. The pitch angle adjustment part 310 installed in the connecting position 2110A can rotate around its own axis to adjust the pitch angle of the backrest body 100, and the adjustment position of the pitch angle adjustment part 310 is locked by the first angle locking mechanism 400. By adjusting the angle between the backrest body 100 and the connecting arm 200 through the pitch angle adjustment part 310, the different pitch angle reclining requirements of different users are met.

[0064] The horizontal angle adjustment part satisfies the requirement that the backrest body 100 can be horizontally adjusted. The structure of the horizontal angle adjustment part can refer to the structure of the pitch angle adjustment part 310. Rotate the pitch angle adjustment part 310 by 90 degrees to make it satisfy horizontal rotation and angle adjustment. When the horizontal angle adjustment part and the pitch angle adjustment part 310 are connected in series through a connecting mechanism, both pitch and horizontal adjustment can be realized, and the angle adjustment is more comprehensive, flexible and practical.

[0065] Please refer to Figure 7 and Figure 8 , the first angle locking mechanism 400 includes first angle locking parts 410 symmetrically arranged on both sides of the pitch angle adjustment part 310, second angle locking parts 420 arranged on the connecting wings 2110 and connected to the first angle locking parts 410 in one-to-one correspondence, two angle locking knobs 430 symmetrically arranged at intervals and movably connected in the first angle locking parts 410 and the second angle locking parts 420, and a return spring 440 arranged between the two angle locking knobs 430. Press the two angle locking knobs 430 towards the direction of approaching each other, and the angle locking knobs 430 move towards the direction close to the first angle locking parts 410 and separate from the second angle locking parts 420. Release the angle locking knobs 430, and the return spring 440 drives the two angle locking knobs 430 to return to their positions and lock the positions of the first angle locking parts 410 and the second angle locking parts 420. When adjusting the pitch angle, it is simple and easy to operate, and the angle can be quickly adjusted.

[0066] Please refer to Figure 9 Figure 9 , the first angle locking part 410 includes a first locking cavity 411 provided on the side wall of the pitching angle adjusting part 310, several first tooth parts 412 arranged at intervals around the inner peripheral surface of the first locking cavity 411, and a guiding groove 413 arranged coaxially with the first locking cavity 411 and surrounding the first locking cavity 411. The two symmetrically arranged first locking cavities 411 are communicated through a first through hole 414, and the inner diameter of the first through hole 414 is smaller than the inner diameter of the first locking cavity 411. In order to save materials of the pitching angle adjusting part 310, the depth of the first locking cavity 411 is relatively deep, and several reinforcing ribs 4130 are arranged in the first locking cavity 411 to ensure the strength of the pitching angle adjusting part 310.

[0067] Please refer to Figure 10 Figure 10 , the second angle locking part 420 includes a second locking cavity 421 provided on the inner wall of the connecting wing 2110, several second tooth parts 422 arranged at intervals around the inner peripheral surface of the second locking cavity 421 and corresponding to the first tooth parts 412, a ring flange 423 protruding from the inner wall of the connecting wing 2110 in a direction away from the inner wall of the connecting wing 2110 and capable of having a clearance fit with the guiding groove 413, and a second through hole 424 provided on the outer wall of the connecting wing 2110 and penetrating inward in the direction of the second locking cavity 421. The inner diameter of the second through hole 424 is smaller than the inner diameter of the second locking cavity 421.

[0068] The angle locking knob 430 includes a knob body 431 with an installation opening at one end, and several third tooth parts 432 arranged at intervals around the outer periphery of the knob body 431. The blind end of the knob body 431 is exposed outside the connecting wing 2110, and after the other relatively open end enters the second through hole 424, the third tooth parts 432 are engaged with the first tooth parts 412 and the second tooth parts 422, so as to lock the pitching angle adjusting part 310 and the connecting wing 2110. The two ends of the return spring 440 are respectively located in the inner cavities of the two knob bodies 431 after passing through the first through hole 414.

[0069] With the above first angle locking mechanism 400, when pressing the blind ends of the two knob bodies 431, several third tooth portions 432 of the two knob bodies 431 move towards the first tooth portion 412, until the third tooth portions 432 enter the gaps of the first tooth portion 412 one by one. In this state, the return spring 440 is compressed, and the third tooth portion 432 is separated from the second tooth portion 422. Therefore, the rotation pitch angle adjustment portion 310 can be adjusted. When rotating the rotation pitch angle adjustment portion 310, the annular flange 423 rotates along the guide groove 413 in the guide groove 413, guiding the rotation direction. After releasing the pressing on the angle locking knob 430, the return spring 440 returns, driving the angle locking knob 430 to return. After the angle locking knob 430 returns, the third tooth portion 432 in the angle locking knob 430 meshes with the first tooth portion 412 and the second tooth portion 422, realizing the locking of the pitch angle adjustment portion 310 and the connecting arm 200. By connecting the two angle locking knobs 430 with the connecting arm 200, the connection strength at the connection position 2110A between the connecting arm 200 and the pitch angle adjustment portion 310 is enhanced. The third tooth portion 432 meshes more tightly with the first tooth portion 412 and the second tooth portion 422, and will not easily slip off, improving the connection reliability of the connection position 2110A.

[0070] The connecting arm 200 includes a telescopic arm 210 connected to the pitch angle adjustment portion 310 and an arm main body 220 that can movably connect the telescopic arm 210 therein. Please refer to Figure 11 , the telescopic arm 210 includes an arm head 211 and an arm rod 212 bolted to the arm head 211. When the telescopic arm 210 is in the original unextended state, the arm head 211 can be exposed outside the outer end of the arm main body 220. The connecting wing 2110 is provided on the arm head 211 and connected to the pitch angle adjustment portion 310. The telescopic arm 210 can reciprocally move inside the arm main body 220, and a telescopic locking mechanism 500 is connected to the arm main body 220 for locking the position of the telescopic arm 210. After the telescopic arm 210 is movably connected inside the arm main body 220, the length of the connecting arm 200 can be adjusted according to the actual situation of the user, providing an adaptable length support for the user.

[0071] One end of the telescopic arm 210 away from the backrest body 100 is provided with a first installation groove for installing an elastic member, that is, the first installation groove is opened at the end face of the arm rod 212 installed in the arm main body 220. A second installation groove connected to the elastic member is opened at a position corresponding to the elastic member inside the arm main body 220. When the telescopic arm 212 is in the original non-telescopic state, the elastic member is in a stretched state in the arm main body to store elastic force. When the locking of the telescopic locking mechanism 500 is unlocked and the arm rod 212 is not limited and can move, the elastic member can drive the telescopic arm to move away from the arm main body. After the arm rod 212 returns to its position, the elastic member is in a stretched state again. The advantage of such a design is that after unlocking the locking of the telescopic locking mechanism 500, the arm rod 212 can move automatically, and the length can be adjusted automatically and quickly, making it more convenient to use.

[0072] The elastic member is preferably a constant-force spring. One end of the constant-force spring has a T-shaped card portion. The first installation groove is an arc groove adapted to the outer peripheral surface of the constant-force spring. The shape of the second installation groove is adapted to the shape of the T-shaped card portion and is connected to the T-shaped card portion in cooperation. The constant-force spring is made of a stainless steel strip. The high-strength steel strip is shaped by a machine into a plurality of concentric circles with the same diameter from the inside to the outside. When the arm rod 212 is in the original non-telescopic state, the end provided with the first installation groove is at a position away from the arm head 211. In this state, the constant-force spring is stretched into a straight line, and at this time, the constant-force spring stores elastic force. After pressing the telescopic locking mechanism 500 to unlock the locking of the arm rod 212, the straightened part of the constant-force spring can return to the previous circle and generate a pulling force to drive the arm rod 212 to move away from the arm main body 220, and the arm rod 212 can automatically move to the maximum telescopic stroke under the drive of the constant-force spring, and then choose whether to shorten the arm rod 212 according to actual needs. After unlocking the locking of the arm rod 212, the arm rod 212 can automatically adjust its length, which is convenient and fast to adjust.

[0073] The elastic member can also be other elastic components such as a tension spring. When installing an elastic member with other structures, the positions of the telescopic arm 210 and the arm main body 220 for installing the elastic member can be adjusted adaptively according to the structure of the elastic member.

[0074] Please refer to Figure 12 , the telescopic locking mechanism 500 includes a first length adjustment part provided on the arm main body 220, a second length adjustment part correspondingly provided on the arm rod 212, a length locking mechanism installed on the first length adjustment part and the second length adjustment part for locking the adjustment position of the second length adjustment part, and a first return spring 540. Pressing the length locking mechanism unlocks the telescopic arm 210 and the arm main body 220, and the telescopic arm 210 can reciprocate along the inner cavity of the arm main body 220 to adjust the length. Releasing the pressing on the length locking mechanism, the first return spring 540 drives the length locking mechanism to return to its position to lock the movable arm rod 212.

[0075] Among them, the first length adjustment part includes an annular protrusion 510A protruding from the outer surface of the arm main body 220 in a direction away from the outer surface, a first fitting cavity 510B recessed from the top surface of the annular protrusion 510A towards the inside of the arm main body 220, a second fitting cavity communicating with the first fitting cavity 510B and having an inner diameter smaller than that of the first fitting cavity 510B, a third fitting cavity 510C located at the lower end of the second fitting cavity and having an inner diameter smaller than that of the second fitting cavity, a fourth fitting cavity provided at one end of the arm main body 220 away from the annular protrusion 510A, and a stepped groove 510D communicating with the fourth fitting cavity and located at the bottom surface of the arm main body 220.

[0076] The second length adjustment part includes two telescopic fitting parts 520 provided on the arm rod 212 and capable of vertically penetrating the arm rod 212. Please refer to Figure 11 , in the top-down orthographic projection plane, the two telescopic fitting parts 520 overlap. All the telescopic fitting parts 520 include a plurality of first fitting spaces 520A arranged at equal intervals along the length direction of the arm rod 212, and a plurality of second fitting spaces 520B. Each two adjacent first fitting spaces 520A are communicated through a second fitting space 520B, and the gap width of the second fitting space 520B is smaller than the gap width of the first fitting space 520A. The positions of the first fitting spaces 520A and the second fitting spaces 520B can correspond to the positions of the first fitting cavity 510B, the second fitting cavity, the third fitting cavity 510C, the fourth fitting cavity, and the stepped groove 510D.

[0077] The length locking mechanism includes a locking button 530A partially installed in the annular protrusion 510A, a spring sleeve section 530B provided at the lower end of the locking button 530A and having an outer diameter smaller than that of the locking button 530A, a first fitting section 530C provided at the lower end of the spring sleeve section 530B, a first limiting section 530D provided at the lower end of the first fitting section 530C and having an outer diameter larger than that of the first fitting section 530C, a second fitting section 530E provided at the lower end of the first limiting section 530D and having the same shape and outer diameter as the first fitting section 530C, a second limiting section 530F provided at the lower end of the second fitting section 530E and having the same shape and outer diameter as the first limiting section 530D, and a tail section 530H provided at the lower end of the second limiting section 530F. The spring sleeve section 530B is sleeved in the first return spring 540 and located at the lower end of the locking button 530A, and the first return spring 540 is partially installed in the third fitting cavity 510C. In the state of locking the telescopic arm 210, the tail section 530H is located in the stepped groove 510D, and the first limiting section 530D and the second limiting section 530F are respectively located in two first fitting spaces 520A at the upper end and the lower end of the arm rod 212 to limit the movement of the arm rod 212. In this state, the spring sleeve section 530B adjacent to the locking button 530A is located in the second fitting cavity, the first fitting section 530C is located in the third fitting cavity 510C, the upper part of the second limiting section 530F is accommodated in the first fitting space 520A and the lower part is accommodated in the fourth fitting cavity, and the first fitting section 530C and the second fitting section 530E can reciprocate in the first fitting space 520A and the second fitting space 520B.

[0078] When the locking button 530A is pressed, the first return spring 540 is in a compressed state, the first limiting section 530D and the second limiting section 530F can disengage from the corresponding first fitting spaces 520A, and the tail section 530H moves in a direction away from the stepped groove 510D until the first fitting section 530C and the second fitting section 530E with smaller outer diameters enter the corresponding first fitting spaces 520A. Since the first fitting section 530C and the second fitting section 530E can also move in the second fitting space 520B, when the user operates the telescopic arm 210 to reciprocate in the arm main body 220, the first fitting section 530C and the second fitting section 530E can smoothly reciprocate in the corresponding telescopic fitting parts 520, and finally the telescopic adjustment of the telescopic arm 210 is realized. After releasing the pressing of the locking button 530A, the first return spring 540 returns to drive the first limiting section 530D and the second limiting section 530F to return to the corresponding first fitting spaces 520A to restore the locking of the position of the telescopic arm 210. The user can adjust the length of the connecting arm 200 according to different length usage requirements. Moreover, during the process of adjusting the telescopic arm 210 to expand and contract, only by pressing the locking button 530A, the telescopic arm 210 can automatically adjust the length or manually adjust the length, and the adjustment is convenient and practical.

[0079] In summary, the multi-angle adjustable backrest device of the utility model is as follows: 1. The connecting arm 200 is connected to the two-wheeled vehicle through the connecting frame, and the locking handle 830 is rotated, so that the pin head 811 can exit the locking hole 710, and the connecting arm 200 is rotated to achieve angle adjustment. The third reset spring 820 drives the pin head 811 to return to the position and locks the position of the connecting plate 700, and the connecting arm 200 can adjust the pitch angle as needed. 2. During the process of rotating and adjusting the connecting arm 200, the positioning bead 930 in the elastic mechanism 900 can enter and exit the locking hole 710, and collide with the edge of the locking hole 710 during the positioning process. The adjustment gear is crisp and obvious, and has an obvious adjustment feel. After the distance between each locking hole 710 is equal, the elastic mechanism 900 is positioned several times, and the specific adjustment angle can be known during each adjustment process to avoid the occurrence of inadequate adjustment or excessive adjustment. 3. The backrest body 100 can be detached from the connecting arm 200, which is convenient for the backrest body 100 to be replaced after wear or outdated style. Moreover, the sliding-in assembly method allows the backrest body 100 and the slider 300 to be quickly positioned during disassembly and replacement, and the entire replacement and assembly process is simple, fast and easy to operate. Fourth, the slider 300 is held by the covering portion 1210 and the holding portion 132 on all sides to form a stable and firm fixed structure, which increases the support strength of the connection after limiting. Fifth, the first angle adjustment mechanism can adjust the pitch angle of the backrest body 100 according to the actual situation of the user, so that the use surface of the backrest body 100 can be more closely supported and relied on by people, and after the angle of the pitch angle adjustment portion 310 is adjusted, it is locked through the two knob bodies 431, and the third tooth portions 432 on the two knob bodies 431 can mesh more closely with the first tooth portion 412 and the second tooth portion 422, thereby improving the locking effect and making the locking angle more firm and reliable. 6. The connecting arm 200 can also be adjusted in length. According to the different lengths of the backrest body 100 required by different users, the telescopic arm 210 is adjusted to reciprocate in the arm body 220, and then the position of the telescopic arm 210 is locked through the telescopic locking mechanism 500 to complete the adjustment of the length of the connecting arm 200.

[0080] The above are only implementation methods of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure made using the contents of the specification and drawings of the present utility model, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present utility model.

Claims

1. A multi-angle adjustable backrest device, characterized in that: include: Backrest; A transfer mechanism is connected between the backrest and the fixed object, and the backrest can rotate around the rotation axis of the transfer mechanism; An angle locking mechanism, disposed at the backrest and / or the fixed object, for locking the backrest so that the backrest is fixed in a current locking state; as well as The elastic mechanism is arranged at the backrest or the fixed object. When the backrest is rotated to adjust, the elastic mechanism is separated from the fixed object or the backrest. After the backrest is adjusted to the required angle, the elastic mechanism returns to its original position to indicate that the angle adjustment is completed.

2. The multi-angle adjustable backrest device according to claim 1, characterized in that: The angle locking mechanism comprises: A plurality of locking holes are arranged to be distributed on the fixed object or the backrest in a ring or arc shape around the rotation axis as the center; and The locking piece is arranged at the backrest or the fixed object and can extend into and exit from the locking hole along the rotation axis direction.

3. The multi-angle adjustable backrest device according to claim 2, characterized in that: The backrest or the fixed object is provided with a through hole opened along the rotation axis direction; the locking element comprises: A locking pin, movably inserted into the through hole; a third return spring, disposed in the through hole and capable of pushing the locking pin retracted in the through hole toward the locking hole; and The locking handle is arranged outside the side of the backrest or the fixed object away from the locking hole, and is connected to the end of the locking pin away from the locking hole.

4. The multi-angle adjustable backrest device according to claim 3, characterized in that: The fixing object comprises two connecting plates spaced apart from each other, each of the connecting plates being provided with the plurality of locking holes; The branch arms of the backrest are each provided with connecting parts corresponding to the positions of the two connecting plates, and each connecting part is provided with a through hole for connecting the locking element. The locking element is rotatably connected to the through hole and the locking handle is located outside the branch arm. When the locking handle is perpendicular to the branch arm, the locking pin can lock the connecting plate, and when the locking handle is rotated away from the through hole, the locking pin can be detached from the connecting plate.

5. The multi-angle adjustable backrest device according to claim 4, characterized in that: The locking pin comprises a pin head connected to the connecting plate, a pin rod fixedly connected to the pin head, and a support rod vertically connected to the pin rod. The locking handle is axially connected to the support rod and rotates around the support rod.

6. The multi-angle adjustable backrest device according to claim 5, characterized in that: The locking handle includes a handle, a handle head fixed to the handle, and a receiving notch provided on the handle head for receiving the pin rod. The outer wall of the handle head has two opposite smooth cut surfaces. The receiving notch is distributed between the two smooth cut surfaces. Each of the smooth cut surfaces is provided with a mounting hole that passes through the receiving notch for mounting the support rod. The mounting hole can rotate around the support rod.

7. The multi-angle adjustable backrest device according to claim 1, characterized in that: The backrest includes a backrest body and a connecting arm detachably connected to the backrest body, the connecting arm includes a telescopic arm and an arm body in which the telescopic arm is movably installed, the telescopic arm can reciprocate inside the arm body, a first mounting groove for mounting an elastic member is provided at one end of the telescopic arm away from the backrest body, and a second mounting groove connected to the elastic member is provided at a position inside the arm body corresponding to the elastic member, a telescopic locking mechanism for locking the position of the telescopic arm is connected to the arm body; when the telescopic arm is in an original un-extended state, the elastic member is in a stretched state to store elastic force, and when the telescopic locking mechanism is unlocked, the elastic member can drive the telescopic arm to move in a direction away from the arm body.

8. The multi-angle adjustable backrest device according to claim 7, characterized in that: The elastic member is a constant force mainspring with a T-shaped clamping portion at one end, the first mounting groove is an arc groove matched with the outer circumferential surface of the constant force mainspring, and the second mounting groove is cooperatively connected with the T-shaped clamping portion.

9. The multi-angle adjustable backrest device according to any one of claims 2 to 6, characterized in that: The curvature and spacing between the elastic mechanism and the locking element are adapted to the curvature and spacing of any two adjacent locking holes. When the locking element is inserted into one of the locking holes, the elastic mechanism abuts against another adjacent locking hole and is limited by the other locking hole.

10. The multi-angle adjustable backrest device according to claim 9, characterized in that: The elastic mechanism includes an insert embedded in the backrest or the fixed object, a second return spring installed in the inner cavity of the insert, and a positioning bead that abuts against the second return spring and is partially exposed outside the insert; when the locking piece is inserted into one of the locking holes, the spherical surface of the positioning bead collides with the edge of the hole of another adjacent locking hole when entering another adjacent locking hole to prompt that the backrest is fixed at the current angle.

Images