A folding and lifting structure for wheelchair footrest

Abstract

A folding and lifting structure for a wheelchair footrest comprises a connecting frame arranged at the front end of a wheelchair frame, a front wheel bracket adjustably mounted on the connecting frame, and a footrest bracket hinged on the front wheel bracket, the footrest bracket comprising a fixed support rod connected to the front wheel bracket and a movable support rod connected to the top of the fixed support rod, an angle being arranged between the movable support rod and the fixed support rod, two sets of hinged plates are arranged on the outer side between the front wheel bracket and the fixed support rod, and the two overlapping hinged plates are hinged by hinge bolts, so that the chair footrest bracket can be rotated outwardly 180°-190° around the hinge bolts to achieve a completely foldable effect and reduce the occupied space; the top of the movable support rod is hinged to the top of the fixed support rod, and a lifting and adjusting mechanism is arranged between the movable support rod and the fixed support rod, so that the movable support can be maintained at different heights to form a support through the lifting and adjusting mechanism, thereby improving the comfort of the footrest bracket.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a folding and lifting structure of a wheelchair footrest. Background Art

[0002] As a device to assist mobility, wheelchairs are essential means of transportation for disabled people. They are widely used in hospitals, homes, etc. However, in order to reduce the space occupied by the wheelchair during transportation, the wheelchair needs to be folded or disassembled before packaging and transportation.

[0003] For example, a foot support device for an electric wheelchair disclosed in a Chinese utility model patent application with patent application number CN202321304330.0 comprises a left frame and a right frame, wherein left and right driving wheels are installed at the lower front ends of the left and right frames, and left and right folding frames are provided at the lower ends of the left and right frames on the side facing the left and right frames, and the left and right folding frames extend obliquely upward respectively and cross each other and are hinged to each other in the middle. The left frame comprises a left frame lower cross beam, a left frame upper cross beam, a left frame connecting beam and a left frame fixing plate, and the right frame comprises a right frame lower cross beam, a right frame upper cross beam, a right frame connecting beam and a right frame fixing plate, and foot support mechanisms are provided at the rear ends of the left and right frame upper cross beams, and the two foot support mechanisms are arranged opposite to each other, and the comfort of the wheelchair is improved by the retractable foot support mechanism.

[0004] In the above structure, since the rotation axis of the footrest bracket is rotatably arranged on the footrest bracket seat, this structure provides the function that the footrest bracket can be opened outwards to facilitate the user to get on and off. However, the footrest bracket of this structure can only be rotated inwards or outwards by 150°-160° and cannot be completely folded. Therefore, it needs to be removed after the wheelchair is folded to reduce the occupied space, which will increase the difficulty of assembling the wheelchair and the complexity of parts.

[0005] Moreover, in the above structure, the footrest bracket is adjustably mounted on the upper crossbeam through a telescopic rod. This structure allows the footrest bracket to be telescopically adjusted forward and backward, thereby improving the comfort of the wheelchair. However, since the angle between the footrest bracket and the upper crossbeam is fixed, the height of the footrest cannot be adjusted, resulting in poor comfort. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a folding and lifting structure for a wheelchair footrest.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] The folding and lifting structure of the wheelchair footrest comprises a connecting frame arranged at the front end of the wheelchair frame, a front wheel bracket adjustably mounted on the connecting frame and a foot support bracket hinged on the front wheel bracket, the foot support bracket comprises a fixed support rod connected to the front wheel bracket and a movable support rod connected to the top of the fixed support rod, an angle is arranged between the movable support rod and the fixed support rod, two groups of hinge pieces with different heights are arranged on the outer sides of the fixed support rod and the front wheel bracket, the two groups of hinge pieces on the fixed support rod are overlapped on the two groups of hinge pieces on the front wheel bracket, the two hinge pieces overlapped with each other are hinged through and through a hinge bolt, the central axis of the hinge bolt is perpendicular to the bottom surface, a lock buckle for locking the fixed support rod is also provided on the inner side of the front wheel bracket, the lock buckle is always fastened to one side of the front wheel bracket through the elastic force of the torsion spring, the fixed support rod is also provided with a lock tongue for cooperating with the lock buckle, the lock tongue is provided with a locking groove, and the lock buckle is fastened in the locking groove to prevent the fixed support rod from opening outward.

[0009] Furthermore, the footrest bracket can rotate outward around the hinge bolt at an angle of 180°-190°.

[0010] Furthermore, the locking groove extends in an arc shape on the locking tongue toward the front wheel bracket, and a rounded corner is provided at the opening of the locking groove.

[0011] Furthermore, a pressure block is provided between the front wheel bracket and the fixed support rod, and the pressure block is fixed to the front side of the front wheel bracket. The pressure block is pressed between the front wheel bracket and the fixed support rod to limit the expansion angle of the fixed support rod, and the pressure block limits the expansion angle of the fixed support rod to 180°.

[0012] In the utility model, the connecting frame is provided with a horizontal forward insertion hole and a plurality of vertical upward adjustment holes, the adjustment hole is connected to the insertion hole, and the front wheel bracket is provided with an insertion rod extending horizontally backward for being inserted into the insertion hole, and the insertion rod is elastically provided with a pin for matching in the adjustment hole, and the front wheel bracket is inserted in the insertion hole through the insertion rod and fixedly connected with the adjustment hole through the pin matching with the adjustment hole.

[0013] Furthermore, the insertion holes and the insertion rods are provided in two groups respectively, and the heights of the two groups of the insertion holes and the insertion rods correspond to each other and are parallel to each other.

[0014] The cam is an adjustable footrest, and the adjustable footrest is an adjustable footrest that is adapted to adjust the height of the adjustable footrest.

[0015] Furthermore, a plurality of evenly arranged sawtooth grooves are provided at the bottom of the adjusting rod, the bayonet is configured as a tapered hole, and one side of the bayonet which is contracted is pressed against the sawtooth groove to form a limit.

[0016] The utility model has the following advantages and beneficial effects:

[0017] By arranging two sets of hinged plates on the outer side between the front wheel bracket and the fixed support rod, the two overlapping hinged plates are hinged by hinged bolts, so that the chair leg bracket can be rotated 180°-190° outward around the hinged bolts, achieving a completely foldable effect and reducing the occupied space.

[0018] By hingedly connecting the top of the movable support rod to the top of the fixed support rod and arranging a lifting adjustment mechanism between the movable support rod and the fixed support rod, the movable bracket can be maintained at different heights through the lifting adjustment mechanism to form support, thereby improving the comfort of the footrest bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 is a schematic diagram of the wheelchair footrest structure in this embodiment;

[0021] Figure 2 Schematic diagram of the installation of the connecting frame and the front wheel bracket in this embodiment;

[0022] Figure 3 for Figure 2 AA section view in;

[0023] Figure 4 for Figure 2 BB section view in;

[0024] Figure 5 Schematic diagram of the lifting and lowering adjustment mechanism in this embodiment;

[0025] Figure 6 Schematic diagram of the coordination between the adjusting paddle and the adjusting rod in this embodiment. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, but the utility model is not limited to the following embodiments.

[0027] like Figures 1 to 6 As shown, the present embodiment discloses a folding and lifting structure of a wheelchair footrest, comprising a connecting frame 1 arranged at the front end of the wheelchair frame, a front wheel bracket 2 adjustably mounted on the connecting frame 1, and a footrest bracket 3 hinged on the front wheel bracket 2. Specifically, the footrest bracket 3 comprises a fixed support rod 31 vertically arranged and connected to the front wheel bracket 2 and a movable support rod 32 for leg support, the top of the movable support rod 32 is connected to the top of the fixed support rod 31, an angle is provided between the movable support rod 32 and the fixed support rod 31, so that the movable support rod 32 is lifted upward by a certain angle to improve the comfort during leg support, the outer sides of the fixed support rod 31 and the front wheel bracket 2 are each provided with two sets of hinged plates 33 with different heights, and the two sets of hinged plates 33 on the fixed support rod 31 are 3 is placed on the two sets of hinged pieces 33 on the front wheel bracket 2. At the same time, the two hinged pieces 33 overlapped with each other are hinged through the hinge bolt 34. The central axis of the hinge bolt 34 is perpendicular to the bottom surface. When the wheelchair needs to be folded, the footrest bracket 3 can be rotated outward by 180°-190° around the hinge bolt 34, so that the footrest can be directly and completely folded to reduce the occupied space. The inner side of the front wheel bracket 2 is also provided with a lock buckle 35 for locking the fixed support rod 31. The lock buckle 35 is always fastened to one side of the front wheel bracket 2 through the elastic force of the torsion spring. The fixed support rod 31 is also provided with a lock tongue 36 for matching the lock buckle 35. The lock tongue 36 is provided with a locking groove 361. The lock buckle 35 is fastened in the locking groove 361 to prevent the fixed support rod 31 from opening outward.

[0028] Furthermore, the locking groove 361 extends in an arc shape to a certain depth on the locking tongue 36 in the direction of the front wheel bracket 2, and the opening of the locking groove 361 is rounded, so that when the lock buckle 35 is fastened, a certain force needs to be applied to fasten it, and similarly, when it needs to be unlocked, a certain force is also required to release the fastening. Moreover, the locking groove 361 extends in an arc shape in the direction of the front wheel bracket 2, which can make the fixing support rod 31 have a tendency to rotate outward, and the lock buckle 35 will be pulled through the locking groove 361 to prevent the lock buckle 35 from loosening.

[0029] Furthermore, a pressure block 37 is provided between the front wheel bracket 2 and the fixed support rod 31. The pressure block 37 is fixed to the front side of the front wheel bracket 2. When the fixed support rod 31 is unfolded, the pressure block 37 is pressed between the front wheel bracket 2 and the fixed support rod 31 to limit the unfolding angle of the fixed support rod 31. The pressure block 37 preferably limits the unfolding angle of the fixed support rod 31 to 180°.

[0030] In this embodiment, the connecting frame 1 is provided with a horizontal forward insertion hole 11 and a plurality of vertical upward and evenly spaced adjustment holes 12, the adjustment hole 12 is connected to the insertion hole 11, and the front wheel bracket 2 has an insertion rod 21 extending horizontally backward for being inserted into the insertion hole 11, and the insertion rod 21 is elastically mounted with a latch 22 for fitting into the adjustment hole 12, the front wheel bracket 2 is inserted into the insertion hole 11 through the insertion rod 21 and fixedly connected with the adjustment hole 12 through the latch 22, and the telescopic length of the front wheel bracket 2 can be adjusted by pressing the latch 22 so that the latch 22 is immersed in the adjustment hole 12, thereby adjusting the front and rear position of the footrest bracket 3 to adapt to improving the comfort of the wheelchair.

[0031] Furthermore, the insertion holes 11 and the insertion rods 21 are provided in two groups, respectively, and the height positions of the two groups of the insertion holes 11 and the insertion rods 21 correspond to each other and are parallel to each other.

[0032] In this embodiment, the top of the movable support rod 32 is rotatably mounted on the top of the fixed support rod 31, and a lifting adjustment mechanism 38 for adjusting the lifting angle of the movable support rod 32 is also provided on the inner side of the foot support bracket 3. The lifting adjustment mechanism 38 includes an adjustment seat 381 rotatably mounted on the fixed support rod 31, an adjustment rod 382 movably engaged with the adjustment seat 381, an adjustment paddle 383 engaged with the adjustment rod 382, ​​and a return spring 384 connected between the adjustment paddle 383 and the adjustment seat 381. The adjustment seat 381 is an L-shaped structure and the bottom extends upward to form a hook. The middle part of the adjustment seat 381 is rotatably connected to the fixed support rod 31 through a connecting shaft. The front end of the adjustment rod 382 bends outward and passes through the movable support rod 32 to form a support, and the rear end of the adjustment rod 382 passes through the adjustment seat 381 and the adjustment paddle 383 and extends backward. The cam 385 is pressed against the top of the adjusting lever 382 to prevent the adjustment of the position of the adjusting lever 382. The cam 385 is pressed against the top of the adjusting lever 382 to prevent the adjustment of the position of the adjusting lever 382.

[0033] Furthermore, in order to improve the limiting effect of the bayonet 385 on the adjustment rod 382, ​​a plurality of evenly arranged serrated grooves 386 are provided at the bottom of the adjustment rod 382, ​​and the bayonet 385 is set as a tapered hole. One side of the shrinkage on the bayonet 385 abuts against the serrated groove 386 to form a limit. When the movable support rod 32 needs to be rotated upward, it can be rotated at any time. When the movable support rod 32 wants to be rotated downward, the adjustment paddle 383 can only be pressed first to release the bayonet 385. This not only improves the limiting effect, but also improves convenience.

[0034] The above contents described in this specification are merely examples of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A folding and lifting structure for a wheelchair footrest, characterized in that: The wheelchair comprises a connecting frame (1) arranged at the front end of a wheelchair frame, a front wheel bracket (2) adjustably mounted on the connecting frame (1), and a foot support bracket (3) hinged to the front wheel bracket (2), the foot support bracket (3) comprising a fixed support rod (31) connected to the front wheel bracket (2) and a movable support rod (32) connected to the top of the fixed support rod (31), an angle being provided between the movable support rod (32) and the fixed support rod (31), two sets of hinged plates (33) of different heights being provided on the outer sides of the fixed support rod (31) and the front wheel bracket (2), the two sets of hinged plates (33) on the fixed support rod (31) being placed on the two sets of hinged plates (33) on the front wheel bracket (2) On the connecting piece (33), two hinged pieces (33) overlapped with each other are hingedly connected by a hinge bolt (34) penetrating therethrough, the central axis of the hinge bolt (34) being perpendicular to the bottom surface, the inner side of the front wheel bracket (2) is also provided with a lock buckle (35) for locking the fixed support rod (31), the lock buckle (35) being always fastened to one side of the front wheel bracket (2) by the elastic force of a torsion spring, the fixed support rod (31) is also provided with a lock tongue (36) for cooperating with the lock buckle (35), the lock tongue (36) being provided with a locking groove (361), the lock buckle (35) being fastened in the locking groove (361) to prevent the fixed support rod (31) from opening outwards.

2. The folding and lifting structure of a wheelchair footrest according to claim 1, characterized in that: The foot support bracket (3) rotates outwards around the hinge bolt (34) at an angle of 180°-190°.

3. The folding and lifting structure of a wheelchair footrest according to claim 1, characterized in that: The locking groove (361) extends in an arc shape on the locking tongue (36) in the direction of the front wheel bracket (2), and a rounded corner is provided at the opening of the locking groove (361).

4. The folding and lifting structure of a wheelchair footrest according to claim 1, characterized in that: A pressing block (37) is further provided between the front wheel bracket (2) and the fixed support rod (31); the pressing block (37) is fixed to the front side of the front wheel bracket (2); the pressing block (37) is pressed between the front wheel bracket (2) and the fixed support rod (31) to limit the unfolding angle of the fixed support rod (31); the pressing block (37) limits the unfolding angle of the fixed support rod (31) to 180°.

5. The folding and lifting structure of a wheelchair footrest according to claim 1, characterized in that: The connecting frame (1) is provided with a horizontal forward insertion hole (11) and a plurality of vertical upward adjustment holes (12); the adjustment hole (12) is connected to the insertion hole (11); a plug-in rod (21) extends horizontally backward on the front wheel bracket (2) and is used to be inserted into the insertion hole (11); a latch (22) is elastically mounted on the plug-in rod (21) and is used to fit into the adjustment hole (12); the front wheel bracket (2) is inserted into the insertion hole (11) through the plug-in rod (21) and is fixedly connected to the adjustment hole (12) through the latch (22).

6. The folding and lifting structure of a wheelchair footrest according to claim 5, characterized in that: The insertion holes (11) and the insertion rods (21) are respectively provided in two groups, and the heights of the two groups of the insertion holes (11) and the insertion rods (21) correspond to each other and are parallel to each other.

7. The folding and lifting structure of a wheelchair footrest according to claim 1, characterized in that: The top of the movable support rod (32) is rotatably mounted on the top of the fixed support rod (31), and a lifting adjustment mechanism (38) for adjusting the lifting angle of the movable support rod (32) is also provided on the inner side of the foot support bracket (3), the lifting adjustment mechanism (38) comprises an adjustment seat (381) rotatably mounted on the fixed support rod (31), an adjustment rod (382) movably engaged with the adjustment seat (381), an adjustment paddle (383) engaged with the adjustment rod (382), and a return spring (384) connected between the adjustment paddle (383) and the adjustment seat (381), the adjustment seat (381) is an L-shaped structure and the bottom extends upward to form a hook, and the middle part of the adjustment seat (381) is rotatable. The adjusting rod (382) is connected to the fixed support rod (31), the front end of the adjusting rod (382) is bent outward and passes through the movable support rod (32), the rear end of the adjusting rod (382) passes through the adjusting seat (381) and the adjusting paddle (383) and extends backward, the bottom of the adjusting paddle (383) abuts against the hook on the adjusting seat (381), the adjusting paddle (383) is provided with a bayonet (385) for the adjusting rod (382) to pass through, the diameter of the bayonet (385) is larger than the diameter of the adjusting rod (382), one end of the return spring (384) is connected to the adjusting seat (381), and the other end abuts against the upper part of the adjusting paddle (383) to push the adjusting paddle (383) to clamp the adjusting rod (382).

8. The folding and lifting structure of a wheelchair footrest according to claim 7, characterized in that: The bottom of the adjusting rod (382) is provided with a plurality of evenly arranged sawtooth grooves (386), the bayonet (385) is configured as a tapered hole, and a conical side of the bayonet (385) abuts against the sawtooth groove (386) to form a limit position.

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