Wheel chair rear support universal wheel shock absorber

Abstract

The invention belongs to the technical field of universal wheel shock absorption, and particularly relates to a wheelchair rear support universal wheel shock absorber which comprises a wheelchair, a limiting block fixedly installed on one side wall face of the wheelchair and a first limiting sleeve shell movably connected to the outer side surface of the limiting block in a sleeving mode. A positioning cylinder is fixedly installed on the inner side wall face of the damping wheel, and a fixing nut is fixedly installed on the inner side wall face of the positioning cylinder. The matched nut clamping ferrule is clamped to the surface of the fixing bolt, a first limiting sleeve shell is elastically pulled back through a spring wire, so that a second limiting sleeve shell is tightly attached to the surface of one end of the fixing bolt, the nut clamping ferrule is rotated in cooperation with an electric motor, and the fixing bolt rotates in the fixing nut; and the fallen fixing bolt can continuously slide in the fixing nut to extrude and push the electric motor under the condition that the fixing bolt is continuously loosened by taking the fixing nut as a center point.

Description

Technical Field

[0001] The invention belongs to the technical field of universal wheel shock absorption, in particular to a universal wheel shock absorber for rear support of a wheelchair. Background Art

[0002] A universal wheel is a so-called movable caster, and its structure allows 360-degree horizontal rotation. Casters are a general term, including movable casters and fixed casters. Fixed casters have no rotating structure and cannot rotate horizontally but only vertically. Universal wheel shock absorbers, also called multi-degree-of-freedom shock absorbers, are a technology that reduces vibration through multi-degree-of-freedom design. Its core principle is to use the structure of a combination of universal wheels and shock absorbers to control the motion state of the equipment, thereby reducing vibration, improving ride comfort and improving driving stability.

[0003] In the current existing technology, the back of the wheelchair is equipped with a universal wheel for shock absorption, and the surface of the universal wheel is equipped with brake pads. Most wheelchairs use a locking method of the brake pads, but due to the large friction, the brake pads are easily worn out. In order to ensure that the brake pads and the universal wheel can move and swing together, the brake pads are additionally installed on the surface of the universal wheel. When the brake pads are worn, the brake pads and the universal wheel need to be replaced regularly. However, in order to prevent the fixing bolts on the surface of the universal wheel from loosening and falling off due to the continuous vibration of the universal wheel during daily use, thereby causing the universal wheel to fall off, most existing wheelchairs use anti-drop bolts, and the anti-drop bolts require a specific disassembly device to be disassembled. If the matching anti-drop bolts are lost, the universal wheel will be directly scrapped, which will cause waste to a certain extent.

[0004] To this end, the present invention provides a wheelchair rear supporting universal wheel shock absorber. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the wheelchair rear support universal wheel shock absorber described in the present invention comprises a wheelchair and a limit block fixedly mounted on a wall surface of one side of the wheelchair, a limit sleeve shell movably sleeved on the outer surface of the limit block, a shock absorbing wheel is arranged on one end of the limit block, a positioning cylinder is fixedly mounted on the inner wall surface of the shock absorbing wheel, and a fixing nut is fixedly mounted on the inner wall surface of the positioning cylinder;

[0007] The inner wall surface of the limit sleeve shell one is movably sleeved with a limit rod, the outer surface of the limit rod is movably sleeved with a spring wire fixedly connected to the outer surface of one end of the limit sleeve shell one, and the outer surface of the other end of the limit sleeve shell one is fixedly connected with a limit sleeve shell two, the matching nut clamping ring is clamped on the surface of the fixing bolt, and the spring wire is used to elastically pull the limit sleeve shell one back, so that the limit sleeve shell two is tightly fitted on the surface of one end of the fixing bolt, and the inner wall surface of the limit sleeve shell two and a limit groove are provided at one side edge position, and a limit plate is movably sleeved on the inner wall surface of the limit groove, so that the limit plate on one end of the electric motor slides inside the limit groove, so that the fixing bolt enters the limit sleeve The outer surface of the limit plate is fixedly connected to an electric motor movably sleeved on the inner wall of the limit sleeve shell 2; a nut clamping ring is detachably mounted on the output end of the electric motor; a threaded fixing bolt movably sleeved on the inner wall of the fixing nut is movably sleeved on the inner wall of the nut clamping ring; the nut clamping ring is rotated by the electric motor to rotate the fixing bolt inside the fixing nut; the falling fixing bolt will take the fixing nut as the center point and, as the fixing bolt continues to relax, the fixing bolt will continue to slide inside the fixing nut and thus squeeze and push the electric motor.

[0008] Preferably, the limit blocks are arranged in two groups, and the outer surface of the limit blocks in one group is movably sleeved with a swing support rod.

[0009] Preferably, a positioning sleeve is fixedly connected to the outer surface of the swing support rod, and a hydraulic damping rod is movably sleeved on the outer surface of one end of the positioning sleeve, and the positioning sleeve cooperates to elastically push the hydraulic damping rod and the elastic buffer wire, and the hydraulic damping rod is used to limit the position of the elastic expansion and contraction of the elastic buffer wire, so that the elastic buffer wire will not tilt too much when elastic expansion and contraction is performed.

[0010] Preferably, an elastic buffer wire is movably sleeved on the outer surface of the hydraulic damping rod. When the wheelchair is moving, the shock-absorbing wheel contacts the ground. When the shock-absorbing wheel vibrates up and down when passing through a pothole, the elastic buffer wire pushes one end of the positioning sleeve shell with elastic force. The other end of the hydraulic damping rod is movably sleeved on the outer surface of another group of limit blocks.

[0011] Preferably, a limiting ring is fixedly connected to the outer surface of the other end of the swing support rod, and the inner wall surface of the limiting ring is movably sleeved with a U-shaped support plate, so that the swing support rod on one end of the positioning sleeve shell swings downward with the limiting block as the center point. When the shock-absorbing wheel moves from the pothole to the road surface, the U-shaped support plate is squeezed and pushed by the shock-absorbing wheel, so that the swing support rod elastically rises with the limiting block as the center point.

[0012] Preferably, a washer which fits on the outer surface of the positioning tube is movably sleeved on the outer surface of the fixing bolt.

[0013] Preferably, one end surface of the U-shaped support plate is movably sleeved on the outer surface of the positioning tube, and the outer surface of the gasket is movably sleeved on the outer surface of the U-shaped support plate.

[0014] Preferably, a supporting steel frame is fixedly installed on the back of the wheelchair, the outer surface of the limit block is fixedly connected to the outer surface of the supporting steel frame, a non-slip cushion is arranged on the top surface of the wheelchair, and a positioning footrest is arranged on the front of the wheelchair.

[0015] The beneficial effects of the present invention are as follows:

[0016] The cam is then engaged with the locking nut and the locking nut is engaged with the locking nut, and the locking nut is engaged with the locking nut and the locking nut is engaged with the locking nut, and the locking nut is engaged with the locking nut and the locking nut is engaged with the locking nut.

[0017] 2. The universal wheel shock absorber for rear support of a wheelchair described in the present invention, when the wheelchair is moving, the shock-absorbing wheel contacts the ground, and when the shock-absorbing wheel vibrates up and down when passing through a pothole, the elastic buffer wire is used to elastically push one end of the positioning sleeve shell, so that the swing support rod on one end of the positioning sleeve shell swings downward with the limit block as the center point. When the shock-absorbing wheel moves from the pothole to the road surface, the shock-absorbing wheel is used to squeeze and push the U-shaped support plate, so that the swing support rod elastically rises with the limit block as the center point, and the positioning sleeve is used to elastically push the hydraulic damping rod and the elastic buffer wire, and the hydraulic damping rod is used to limit the position of the elastic expansion and contraction of the elastic buffer wire, so that the elastic buffer wire will not tilt too much in the position when elastically expanding and contracting, so that the U-shaped support plate can only swing vertically up and down when elastic buffering is performed, so that the transmission force is completely guided to the inside of the hydraulic damping rod and the elastic buffer wire, thereby achieving a buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 is a stereogram of the present invention;

[0020] Figure 2 is a schematic diagram of the three-dimensional structure of the wheelchair of the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the wheelchair of the present invention from the side;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the elastic buffer wire of the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the elastic buffer wire of the present invention;

[0024] Figure 6 It is a schematic diagram of the unfolded three-dimensional structure of the elastic buffer wire of the present invention;

[0025] Figure 7 It is a schematic diagram of a cross-sectional three-dimensional structure of a limiting sleeve of the present invention;

[0026] Figure 8 It is a schematic diagram of a partially unfolded three-dimensional structure of a limiting sleeve of the present invention;

[0027] Fig. 9 It is a partial cross-sectional three-dimensional structural schematic diagram of the limiting sleeve of the present invention.

[0028] In the figure: 11, wheelchair; 111, anti-slip cushion; 112, supporting steel frame; 113, positioning footrest; 12, limiting block; 121, swing support rod; 122, positioning sleeve; 123, hydraulic damping rod; 124, elastic buffer wire; 125, limiting ring; 126, U-shaped support plate; 127, shock-absorbing wheel; 128, positioning cylinder; 129, fixing nut; 13, limiting sleeve one; 131, limiting rod; 132, spring wire; 133, limiting sleeve two; 134, limiting groove; 135, limiting plate; 136, electric motor; 137, nut clamping ring; 138, fixing bolt; 139, washer. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0030] like Figures 1 to 9 As shown, a wheelchair rear support universal wheel shock absorber according to an embodiment of the present invention comprises a wheelchair 11 and a limit block 12 fixedly mounted on a wall surface of one side of the wheelchair 11, a limit sleeve 13 movably sleeved on the outer surface of the limit block 12, a shock absorbing wheel 127 is arranged on one end of the limit block 12, a positioning cylinder 128 is fixedly mounted on the inner wall surface of the shock absorbing wheel 127, and a fixing nut 129 is fixedly mounted on the inner wall surface of the positioning cylinder 128;

[0031] A limiting rod 131 is movably sleeved on the inner wall surface of the limiting sleeve 13, and a spring wire 132 fixedly connected to the outer surface of one end of the limiting sleeve 13 is movably sleeved on the outer surface of the limiting rod 131. A limiting sleeve 2 133 is fixedly connected to the outer surface of the other end of the limiting sleeve 13. A limiting groove 134 is provided on the inner wall surface of the limiting sleeve 2 133 and located at a side edge position. A limiting plate 135 is movably sleeved on the inner wall surface of the limiting groove 134. An electric motor 136 movably sleeved on the inner wall surface of the limiting sleeve 2 133 is fixedly connected on the outer surface of the limiting plate 135. A nut clamping ring 137 is detachably mounted on the output end of the electric motor 136. A fixing bolt 138 threaded and movably sleeved on the inner wall surface of the fixing nut 129 is movably sleeved on the inner wall surface of the nut clamping ring 137.

[0032] When the limiting rod 131, spring wire 132, limiting sleeve 133, electric motor 136, 135, limiting groove 134, nut clamping ring 137 and fixing bolt 138 provided by the present invention are used, when the shock-absorbing wheel 127 is replaced, the limiting sleeve 13 is pulled to make the limiting sleeve 13 slide to both sides on the surface of the limiting rod 131, and one end of the limiting sleeve 133 is sleeved on the surface of the fixing bolt 138, and the matching nut clamping ring 137 is clamped on the surface of the fixing bolt 138, and the spring wire 132 is used to elastically pull back the limiting sleeve 13, so that the limiting sleeve 133 is tightly fitted on one end surface of the fixing bolt 138, and the electric motor 136 is used to rotate the nut clamping ring 137, so that the fixing bolt 138 is fixed on the fixing nut 129. The detached fixing bolt 138 will rotate inside the fixing nut 129 with the fixing nut 129 as the center point. As the fixing bolt 138 is continuously loosened, the fixing bolt 138 will continuously slide inside the fixing nut 129 and squeeze the electric motor 136, so that the limiting plate 135 on one end of the electric motor 136 slides inside the limiting groove 134, so that the fixing bolt 138 enters the deep of the limiting sleeve shell 133, and cooperates with the narrow space inside the limiting sleeve shell 133 to limit the position of the fixing bolt 138, so as to achieve the effect of limiting the position of the fixing bolt 138 after being disassembled and storing it safely, and avoid the fixing bolt 138 being lost after the fixing bolt 138 is disassembled, which will cause the universal wheel to be directly scrapped, which will cause waste to a certain extent.

[0033] Furthermore, if Figure 1 - Fig. 9 As shown, the number of limit blocks 12 is provided in two groups, the outer surface of one group of limit blocks 12 is movably sleeved with a swing support rod 121, the outer surface of the swing support rod 121 is fixedly connected with a positioning sleeve 122, one end of the positioning sleeve 122 is movably sleeved with a hydraulic damping rod 123 on the outer surface, the outer surface of the hydraulic damping rod 123 is movably sleeved with an elastic buffer wire 124, the other end of the hydraulic damping rod 123 is movably sleeved on the outer surface of the other group of limit blocks 12, the other end of the swing support rod 121 is fixedly connected with a limit ring 125, the inner wall surface of the limit ring 125 is movably sleeved with a hydraulic damping rod 123, and the outer surface of the hydraulic damping rod 123 is movably sleeved with an elastic buffer wire 124. The other end of the hydraulic damping rod 123 is movably sleeved on the outer surface of the other group of limit blocks 12, and the outer surface of the other end of the swing support rod 121 is fixedly connected with a limit ring 125. A U-shaped support plate 126 is movably sleeved on the outer surface of the fixing bolt 138, and a washer 139 that fits on the outer surface of the positioning tube 128 is movably sleeved on the outer surface of the positioning tube 128. One end surface of the U-shaped support plate 126 is movably sleeved on the outer surface of the positioning tube 128, and the outer surface of the washer 139 is movably sleeved on the outer surface of the U-shaped support plate 126. A supporting steel frame 112 is fixedly installed on the back of the wheelchair 11, and the outer surface of the limit block 12 is fixedly connected to the outer surface of the supporting steel frame 112. A non-slip seat cushion 111 is arranged on the top surface of the wheelchair 11, and a positioning footrest 113 is arranged on the front of the wheelchair 11.

[0034] When the swing support rod 121, the positioning sleeve 122, the hydraulic damping rod 123, the elastic buffer wire 124, the U-shaped support plate 126 and the shock-absorbing wheel 127 provided by the present invention are in use, when the wheelchair 11 is moving, the shock-absorbing wheel 127 contacts the ground, and when the shock-absorbing wheel 127 passes through a pothole and vibrates up and down, the elastic buffer wire 124 is used to elastically push one end of the positioning sleeve 122, so that the swing support rod 121 on one end of the positioning sleeve 122 swings downward with the limit block 12 as the center point, and when the shock-absorbing wheel 127 moves from the pothole to the road surface, the shock-absorbing wheel 127 is used to squeeze and push the U-shaped support plate 126, so that the swing support rod 121 elastically rises with the limit block 12 as the center point, and cooperates with the positioning sleeve 1 22 elastically pushes the hydraulic damping rod 123 and the elastic buffer wire 124, and uses the hydraulic damping rod 123 to limit the position of the elastic expansion and contraction of the elastic buffer wire 124, so that the elastic buffer wire 124 will not tilt too much in the position when elastically expanding and contracting, and achieves the effect of only being able to swing vertically up and down when elastic buffering is performed by using the limited U-shaped support plate 126 of the hydraulic damping rod 123, thereby avoiding the elastic buffer wire 124 from tilting when elastic buffering is performed due to the lack of the limitation of the hydraulic damping rod 123, thereby causing the shock-absorbing wheel 127 to tilt when elastically buffering up and down, thereby increasing the friction between the shock-absorbing wheel 127 and the ground, causing side wear, and accelerating the wear of the shock-absorbing wheel 127.

[0035] The working principle provided by the present invention is as follows: when replacing the shock-absorbing wheel 127, the limiting sleeve 13 is pulled to make the limiting sleeve 13 slide to both sides on the surface of the limiting rod 131, and one end of the limiting sleeve 133 is sleeved on the surface of the fixing bolt 138, and the matching nut clamping ring 137 is clamped on the surface of the fixing bolt 138, and the limiting sleeve 13 is elastically pulled back by the spring wire 132, so that the limiting sleeve 133 is tightly fitted on the surface of one end of the fixing bolt 138, and the electric motor 136 is used to rotate the nut clamping ring 137, so that the fixing bolt 138 is fixed on the fixing nut 129. The fixing bolt 138 that has fallen off will rotate with the fixing nut 129 as the center point. When the fixing bolt 138 is continuously loosened, the fixing bolt 138 will continuously slide inside the fixing nut 129 and squeeze the electric motor 136, so that the limiting plate 135 on one end of the electric motor 136 slides inside the limiting groove 134, so that the fixing bolt 138 enters the deep of the limiting sleeve 133, and the position of the fixing bolt 138 is limited by the narrow space inside the limiting sleeve 133, so as to achieve the effect of limiting the position of the fixing bolt 138 after removal and storing it safely.

[0036] When the wheelchair 11 is moving, the shock-absorbing wheel 127 contacts the ground. When the shock-absorbing wheel 127 passes through a pothole and vibrates up and down, the elastic buffer wire 124 pushes one end of the positioning sleeve 122 with elastic force, so that the swing support rod 121 on one end of the positioning sleeve 122 swings downward with the limit block 12 as the center point. When the shock-absorbing wheel 127 moves from the pothole to the road surface, the shock-absorbing wheel 127 squeezes and pushes the U-shaped support plate 126, so that the swing support rod 121 elastically rises with the limit block 12 as the center point, and cooperates with the positioning sleeve 122 to elastically push the hydraulic damping rod 123 and the elastic buffer wire 124, and uses the hydraulic damping rod 123 to limit the position of the elastic expansion and contraction of the elastic buffer wire 124, so that the elastic buffer wire 124 will not tilt too much in the position when elastic expansion and contraction is performed, achieving the effect of using the limited U-shaped support plate 126 of the hydraulic damping rod 123 to only swing vertically up and down during elastic buffering.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wheelchair rear support universal wheel shock absorber, comprising a wheelchair (11) and a limit block (12) fixedly mounted on a wall surface of one side of the wheelchair (11), and a limit sleeve (13) movably sleeved on an outer surface of the limit block (12), characterized in that: A damping wheel (127) is provided on one end of the limit block (12), a positioning cylinder (128) is fixedly installed on the inner wall surface of the damping wheel (127), and a fixing nut (129) is fixedly installed on the inner wall surface of the positioning cylinder (128); A limiting rod (131) is movably sleeved on the inner wall surface of the limiting sleeve (13); a spring wire (132) fixedly connected to the outer surface of one end of the limiting sleeve (13) is movably sleeved on the outer surface of the limiting rod (131); a limiting sleeve (133) is fixedly connected to the outer surface of the other end of the limiting sleeve (13); a limiting groove (134) is provided on the inner wall surface of the limiting sleeve (133) and at a position of one side edge; the limiting groove (134) is provided on the inner wall surface of the limiting sleeve (133) and at a position of a side edge; A limit plate (135) is movably sleeved on the inner wall surface of the limit sleeve (34), and the outer surface of the limit plate (135) is fixedly connected to an electric motor (136) movably sleeved on the inner wall surface of the limit sleeve shell (133). A nut clamping ring (137) is detachably mounted on the output end of the electric motor (136), and a fixing bolt (138) movably sleeved on the inner wall surface of the nut clamping ring (137) is threaded and movably sleeved on the inner wall surface of the fixing nut (129).

2. The wheelchair rear support universal wheel shock absorber according to claim 1, characterized in that: The number of the limit blocks (12) is two groups, and the outer surface of one group of limit blocks (12) is movably sleeved with a swing support rod (121).

3. The wheelchair rear support universal wheel shock absorber according to claim 2, characterized in that: A positioning sleeve (122) is fixedly connected to the outer surface of the swing support rod (121), and a hydraulic damping rod (123) is movably sleeved on the outer surface of one end of the positioning sleeve (122).

4. The wheelchair rear support universal wheel shock absorber according to claim 3, characterized in that: An elastic buffer wire (124) is movably sleeved on the outer surface of the hydraulic damping rod (123), and the other end of the hydraulic damping rod (123) is movably sleeved on the outer surface of another group of limit blocks (12).

5. The wheelchair rear support universal wheel shock absorber according to claim 4, characterized in that: A limiting collar (125) is fixedly connected to the outer surface of the other end of the swing support rod (121), and a U-shaped supporting plate (126) is movably sleeved on the inner wall surface of the limiting collar (125).

6. The wheelchair rear support universal wheel shock absorber according to claim 1, characterized in that: A washer (139) is movably sleeved on the outer surface of the fixing bolt (138) and is fitted on the outer surface of the positioning tube (128).

7. The wheelchair rear support universal wheel shock absorber according to claim 6, characterized in that: One end surface of the U-shaped support plate (126) is movably sleeved on the outer surface of the positioning tube (128), and the outer surface of the gasket (139) is movably sleeved on the outer surface of the U-shaped support plate (126).

8. The wheelchair rear support universal wheel shock absorber according to claim 1, characterized in that: A supporting steel frame (112) is fixedly mounted on the back of the wheelchair (11), the outer surface of the limit block (12) is fixedly connected to the outer surface of the supporting steel frame (112), an anti-slip cushion (111) is arranged on the top surface of the wheelchair (11), and a positioning footrest (113) is arranged on the front of the wheelchair (11).

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