A folding wheelchair structure with changeable seat orientation

Abstract

The utility model provides a kind of folding wheelchair structure of replaceable seat direction, including frame, two front wheels and two rear wheels being located at the bottom of frame, push handle being located at the top of frame, and seat;Frame includes two four-bar mechanisms being symmetrically arranged left and right, and one installation slot is fixedly arranged between two four-bar mechanisms, installation slot includes the support beam extending along left and right transverse, and vertical slot located at the both ends of support beam, the both ends of support beam are respectively provided with one sunken groove, and at least the position of one groove is embedded with the elastic buckle that can be inserted into groove and elastically buckled;The installation frame matched with installation slot is equipped below seat, and installation frame includes crossbeam and the vertical rod that can be inserted into vertical slot and is extended upward at both ends of crossbeam, the both ends of crossbeam are formed into clamping block downward, clamping block is buckled with elastic buckle after being inserted into groove, to realize the detachable seat on frame and can be installed in opposite direction.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a folding wheelchair structure with interchangeable seat orientation. Background Technology

[0002] For disabled individuals such as children with cerebral palsy who lack mobility, traditional wheelchairs offer poor support and comfort, leading to the development of wheelchairs specifically designed for this group. These wheelchairs typically consist of a frame and a seat. The seat includes a backrest, seat board, and footrests, and its angle is adjustable, significantly improving comfort. The frame, on the other hand, usually needs to provide sufficient support and folding functionality, making the frame and seat structure of these wheelchairs more complex than traditional wheelchairs. In practical use, for younger users, it is necessary to design the seat to be reversible for safer pushing and easier assistance from support staff. Utility Model Content

[0003] The purpose of this invention is to provide a folding wheelchair structure with high reliability and simple operation, and interchangeable seat directions.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A folding wheelchair structure with interchangeable seat orientation includes a frame, two front wheels and two rear wheels located at the bottom of the frame, a push handle located at the top of the frame, and a seat. The frame includes two four-bar linkages symmetrically arranged on the left and right sides, and a mounting groove is fixedly provided between the two four-bar linkages. The mounting groove includes a support beam extending laterally on the left and right sides, and vertical grooves located at both ends of the support beam. Each end of the support beam has a recessed groove, and at least one of the grooves is fitted with an elastic buckle that can extend into the groove and be elastically fastened. A mounting bracket that mates with the mounting groove is provided below the seat. The mounting bracket includes a crossbeam and vertical rods extending upward at both ends that can be inserted into the vertical grooves. The two ends of the crossbeam form downward locking blocks. After the locking blocks are inserted into the grooves, they are fastened with the elastic buckles, thereby realizing the detachability of the seat on the frame and its ability to be installed in opposite directions.

[0005] In a preferred embodiment, the seat includes a backrest assembly, a seat assembly, and a footrest assembly connected in sequence; the two sides of the seat assembly are coaxially rotatably mounted between two vertical rods, allowing the seat assembly to rotate about a transverse axis; a positioning bracket is arranged at the bottom of the seat assembly along the front-rear direction, and the side of the positioning bracket has a plurality of first positioning holes arranged in an arc shape, the arc shape of the first positioning holes being concentric with the rotation trajectory of the seat assembly; a first elastic locking mechanism that can be inserted into the first positioning hole is fixedly provided on the crossbeam; the angle of the seat can be adjusted by inserting the first elastic locking mechanism into the first positioning hole at different positions.

[0006] In a preferred embodiment, the first elastic locking mechanism includes a fixed base fixed to the crossbeam, a locking rod elastically telescopically disposed within the fixed base, and a handle assembly for pulling the locking rod to extend or retract.

[0007] In a preferred embodiment, the bottom ends of the backrest assembly are rotatably connected to the rear ends of the seat assembly on both sides. An adjustment bracket along the vertical direction is also arranged on the back of the backrest assembly and the seat assembly. The lower end of the adjustment bracket is rotatably connected to the seat assembly about a horizontal axis, and the upper end of the adjustment bracket is also rotatably connected to the backrest assembly about a horizontal axis. Specifically, a vertical positioning strip is fixedly provided on the back of the backrest assembly. Several second positioning holes are vertically distributed on the side of the positioning strip. The adjustment bracket is provided with a second elastic locking mechanism that can be inserted into the second positioning holes. By inserting the second elastic locking mechanism into the second positioning holes at different positions, the angle of the backrest assembly can be adjusted.

[0008] In a preferred embodiment, the foot pedal assembly includes a column with its top end fixed to the front end of the seat plate assembly, a mounting base adjustablely fixed to the column, and a pedal mounted on the front side of the mounting base, the pedal being connected and fixed to the mounting base at an adjustable angle via a transverse axis.

[0009] In a preferred embodiment, the four-bar linkage includes a forward-angled long rod extending from the push handle to the front wheel, a rear support rod extending obliquely from the middle of the forward long rod to the rear wheel, and a lower support rod spanning between the front wheel and the rear wheel. The upper end of the rear support rod is hinged to the middle of the forward long rod, the lower end of the rear support rod is hinged to the rear end of the lower support rod, and the front end of the lower support rod is hinged to the bottom end of the forward long rod. The upper end of the rear support rod, beyond the hinge point, is also provided with a folding locking mechanism for fixing to the forward long rod.

[0010] In a preferred embodiment, the folding locking mechanism includes a sleeve section at the lower end of the front long rod, a long rod section with its lower end inserted into the sleeve section, an elongated through hole along its length on the sleeve section, an elongated locking hole along its length at the lower end of the long rod section, a latching structure that restricts the long rod section from being inserted into a specific position on the sleeve section, and a locking pin extending from the top end of the rear support rod for passing through the elongated through hole and inserting into the elongated locking hole; when the latching structure is locked, the elongated through hole and the elongated locking hole together clamp and lock the locking pin; when the latching structure is released, pushing the long rod section downward and pressing it down by pushing the handle can cause the locking pin to slide out from the elongated locking hole and the elongated through hole, thereby folding the four-bar linkage.

[0011] In a preferred embodiment, the two rear wheels are rotatably mounted on both ends of a transverse rear beam, and the frame is fixedly mounted to the rear beam; an external gear disc is concentrically fixedly mounted on the inner side of each rear wheel, and a rotatable brake pedal is mounted on the frame, the brake pedal having a brake lever; when the brake pedal is pressed down, the brake lever can fall into the tooth groove of the external gear disc to prevent the rear wheels from rotating.

[0012] The advantages of this utility model are as follows: the seat is inserted downward into the mounting slot of the frame through the mounting bracket and locked by the elastic buckle, so that the connection between the seat and the frame is reliable; the frame structure does not need to be changed when the seat is reversed, thus ensuring the stability of the frame structure; when changing the direction, it is only necessary to open the elastic buckle, take out the seat as a whole, reverse it and then put it back in. The reversing operation is simple and can be easily completed by one person. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a three-dimensional perspective view of the overall structure of the wheelchair in the embodiment; Figure 2 This is a schematic diagram of the wheelchair structure after the seat is removed in the embodiment; Figure 3 This is a schematic diagram of the mounting slot in the embodiment; Figure 4 This is a partial structural exploded view of the four-bar linkage in the embodiment; Figure 5 This is a structural schematic diagram of the seat in the embodiment; Figure 6 This is a schematic diagram of the mounting bracket and the first elastic locking mechanism in the embodiment; Figure 7 This is a schematic diagram of the positioning bracket and the first elastic locking mechanism in the embodiment; Figure 8This is a schematic diagram of the structure of the adjusting bracket and positioning strip in the embodiment; Figure 9 This is a schematic diagram of the installation structure of the rear wheel part in the embodiment. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings: In this embodiment, "front" refers to the side of the wheelchair where the feet are placed; "back" refers to the side of the wheelchair's backrest.

[0016] refer to Figure 1 A folding wheelchair structure with interchangeable seat orientation includes a frame 1, two front wheels 2 and two rear wheels 3 located at the bottom of the frame 1, a push handle 4 located at the top of the frame 1, and a seat 5.

[0017] refer to Figures 2 to 4 The frame 1 includes two four-bar linkages 11 arranged symmetrically on the left and right, and a mounting groove 12 is fixedly provided between the two four-bar linkages 11. The mounting groove 12 includes a support beam 121 extending laterally on the left and right, and vertical grooves 122 located at both ends of the support beam 121. A recessed groove 123 is provided at each end of the support beam 121, and at least one of the grooves 123 is fitted with an elastic buckle 124 that can extend into the groove 123 and be elastically fastened 124. The elastic buckle 124 typically includes a buckle portion extending into the groove 123, an operating portion extending outward from the buckle portion into the groove 123, and an elastic portion that forces the buckle portion to return to its original position. The operating portion causes the buckle portion to retract and deform, while the elastic portion allows the buckle portion to return to its original position. For example, the buckle portion can be inserted into the groove 123 from the outside of the end face of the support beam 121 along the length of the support beam 121. The operating portion located outside the end face of the support beam 121 is a pressing handle, and the elastic portion is a torsion spring, which retracts the buckle portion by pressing. Alternatively, the operating portion can be a pull ring, and the elastic portion can be a compression spring, which retracts the buckle portion by pulling. Various conventional elastic buckle 124 designs are also available.

[0018] Furthermore, the four-bar linkage 11 includes a forward-angled long rod 111 extending from the push handle 4 to the front wheel 2, a rear support rod 112 extending obliquely from the middle of the forward long rod 111 to the rear wheel 3, and a lower support rod 113 spanning between the front wheel 2 and the rear wheel 3. The upper end of the rear support rod 112 is hinged to the middle of the forward long rod 111, the lower end of the rear support rod 112 is hinged to the rear end of the lower support rod 113, and the front end of the lower support rod 113 is hinged to the bottom end of the forward long rod 111. The upper end of the rear support rod 112 is also provided with a folding locking mechanism for fixing to the forward long rod 111 at the point beyond the hinge point.

[0019] Furthermore, the folding locking mechanism includes a sleeve section 1111 of the lower part of the front long rod 111, a long rod section 1112 whose lower end is inserted into the sleeve section 1111, an elongated through hole 1113 opened on the sleeve section 1111 along its length direction, an elongated locking hole 1114 opened at the lower end of the long rod section 1112 along its length direction, a locking structure 1115 that restricts the long rod section 1112 from being inserted into a specific position on the sleeve section 1111, and a locking pin 1121 extending from the top end of the rear support rod 112 for passing through the elongated through hole 1113 and being inserted into the elongated locking hole 1114. The locking structure 1115 includes an elastic snap buckle 1115a on the sleeve section 1111 and a slot 1115b on the long rod section 1112 that is adapted to the snap buckle 1115a. In the reset state, the snap buckle 1115a can be snapped into the slot 1115b to restrict the movement of the long rod section 1112 relative to the sleeve section 1111. When the snap buckle 1115a is pressed down and the long rod section 1112 is pushed into the sleeve section 1111, the snap buckle 1115a can be disengaged from the slot 1115b. When the latching structure 1115 is locked, the elongated through hole 1113 and the elongated lock hole 1114 together clamp and lock the locking pin 1121; when the latching structure 1115 is released, the long rod section 1112 is pushed down and pressed down by the push handle 4, which allows the locking pin 1121 to slide out from the elongated lock hole 1114 and the elongated through hole 1113, thereby folding the four-bar linkage 11. In other embodiments, the folding locking mechanism can adopt a conventional structure, such as fixing or releasing two of the links of the four-bar linkage 11 by means of pins or latches.

[0020] refer to Figures 5 to 8 The seat 5 is provided with a mounting bracket 51 below it that cooperates with the mounting groove 12. The mounting bracket 51 includes a crossbeam 511 and vertical rods 512 extending upward at both ends and capable of being inserted into the vertical groove 122. The two ends of the crossbeam 511 form locking blocks 513 downward. After the locking blocks 513 are inserted into the groove 123, they are fastened with the elastic buckle 124, thereby realizing the detachability of the seat 5 on the frame 1 and the ability to be installed in the opposite direction.

[0021] Furthermore, the seat 5 includes a backrest assembly 52, a seat assembly 53, and a footrest assembly 54 connected in sequence; the two sides of the seat assembly 53 are coaxially rotatably mounted between the two vertical rods 512, allowing the seat assembly 53 to rotate around a transverse axis; a positioning bracket 531 is arranged at the bottom of the seat assembly 53 along the front-rear direction, and a plurality of first positioning holes 5311 are arranged on the side of the positioning bracket 531 in an arc shape, and the arc shape of the distribution of the first positioning holes 5311 is concentric with the rotation trajectory of the seat assembly 53; a first elastic locking mechanism 532 that can be inserted into the first positioning hole 5311 is fixedly provided on the crossbeam 511; the angle of the seat 5 can be adjusted by inserting the first elastic locking mechanism 532 into the first positioning hole 5311 at different positions. Furthermore, the first elastic locking mechanism 532 includes a fixed base 5321 fixed to the crossbeam 511, a locking rod 5322 elastically telescopically disposed within the fixed base 5321, and a handle assembly 5323 for pulling the locking rod 5322 to extend or retract. By operating the handle assembly 5323, different angles of the seat 5 can be adjusted, improving user comfort. Since the rotation center for adjusting the seat 5 angle is located on the mounting bracket 51, the seat 5 can maintain balance and stability with the frame 1 at different angles and orientations.

[0022] Furthermore, the bottom ends of the backrest assembly 52 are rotatably connected to the rear ends of the seat assembly 53 on both sides. An adjustment bracket 521 along the vertical direction is also arranged on the back of the backrest assembly 52 and the seat assembly 53. The lower end of the adjustment bracket 521 is rotatably connected to the seat assembly 53 about a horizontal axis, and the upper end of the adjustment bracket 521 is also rotatably connected to the backrest assembly 52 about a horizontal axis. Specifically, a vertical positioning strip 522 is fixedly provided on the back of the backrest assembly 52. ​​Several second positioning holes 523 are vertically distributed on the side of the positioning strip 522. The adjustment bracket 521 is provided with a second elastic locking mechanism 524 that can be inserted into the second positioning holes 523. By inserting the second elastic locking mechanism 524 into the second positioning holes 523 at different positions, the angle of the backrest assembly 52 can be adjusted. The structural principle of the second elastic locking mechanism 524 is the same as that of the first elastic locking mechanism 532. The adjustable backrest assembly 52 enhances user comfort.

[0023] Furthermore, the foot pedal assembly 54 includes a column 541 with its top end fixed to the front end of the seat assembly 53, a mounting base 542 adjustablely fixed to the column 541, and a pedal 543 mounted on the front side of the mounting base 542. The pedal 543 is connected and fixed to the mounting base 542 at an adjustable angle via a transverse axis. Adjusting the angle of the foot pedal assembly 54 improves user comfort.

[0024] The seat 5 is inserted downward into the mounting slot 12 of the frame 1 via the mounting bracket 51 and locked by the elastic buckle 124. The user's own downward gravity prevents the seat 5 from detaching from the frame 1, so the connection between the seat 5 and the frame 1 is reliable. The structure of the frame 1 does not need to be changed when the seat 5 is reversed, which ensures the stability of the frame 1 structure. When changing the direction, simply press the elastic buckle 124 to remove the seat 5 as a whole, reverse it, and then put it back in. The reversing operation is simple and can be easily completed by one person.

[0025] refer to Figure 9 In a preferred configuration, the two rear wheels 3 are rotatably mounted at both ends of a transverse rear beam 31, and the frame 1 is fixedly mounted to the rear beam 31. An external gear disc 32 is concentrically fixed to the inner side of each rear wheel 3, and a rotatable brake pedal 33 is mounted on the frame 1. The brake pedal 33 has a brake lever 331. When the brake pedal 33 is pressed down, the brake lever 331 falls into the tooth groove of the external gear disc 32, thereby preventing the rear wheels 3 from rotating. The assistive user only needs to press down the brake pedal 33 to lock the wheelchair brake, improving the wheelchair's safety.

[0026] The above description does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A folding wheelchair structure with interchangeable seat orientation, comprising a frame, two front wheels and two rear wheels disposed at the bottom of the frame, a push handle disposed at the top of the frame, and a seat; characterized in that: The frame includes two four-bar linkages symmetrically arranged on the left and right, and a mounting groove is fixedly provided between the two four-bar linkages. The mounting groove includes a support beam extending laterally on the left and right, and vertical grooves located at both ends of the support beam. Each end of the support beam has a recessed groove, and at least one of the grooves is fitted with an elastic buckle that can extend into the groove and be elastically fastened. The seat is provided with a mounting bracket that cooperates with the mounting groove. The mounting bracket includes a crossbeam and vertical rods extending upward at both ends that can be inserted into the vertical grooves. The two ends of the crossbeam form downward locking blocks. After the locking blocks are inserted into the grooves, they are fastened with the elastic buckles, thereby realizing the detachability of the seat on the frame and the ability to be installed in the opposite direction.

2. The folding wheelchair structure with interchangeable seat orientation according to claim 1, characterized in that: The seat includes a backrest assembly, a seat assembly, and a footrest assembly connected in sequence. The two sides of the seat assembly are coaxially rotatably mounted between the two vertical rods, allowing the seat assembly to rotate around a transverse axis. A positioning bracket is arranged at the bottom of the seat assembly along the front-to-back direction. The side of the positioning bracket has several first positioning holes arranged in an arc shape, and the arc shape of the first positioning holes is concentric with the rotation trajectory of the seat assembly. A first elastic locking mechanism that can be inserted into the first positioning hole is fixedly provided on the crossbeam. The angle of the seat can be adjusted by inserting the first elastic locking mechanism into the first positioning hole at different positions.

3. The folding wheelchair structure with interchangeable seat orientation according to claim 2, characterized in that: The first elastic locking mechanism includes a fixed base fixed to the crossbeam, a locking rod elastically telescopically disposed within the fixed base, and a handle assembly for pulling the locking rod to extend or retract.

4. The folding wheelchair structure with interchangeable seat orientation according to claim 2, characterized in that: The bottom ends of the backrest assembly are rotatably connected to the rear ends of the seat assembly on both sides. An adjustment bracket along the vertical direction is also arranged on the back of the backrest assembly and the seat assembly. The lower end of the adjustment bracket is rotatably connected to the seat assembly about a horizontal axis, and the upper end of the adjustment bracket is also rotatably connected to the backrest assembly about a horizontal axis. Specifically, a vertical positioning strip is fixedly provided on the back of the backrest assembly. Several second positioning holes are vertically distributed on the side of the positioning strip. The adjustment bracket is provided with a second elastic locking mechanism that can be inserted into the second positioning holes. By inserting the second elastic locking mechanism into the second positioning holes at different positions, the angle of the backrest assembly can be adjusted.

5. The folding wheelchair structure with interchangeable seat orientation according to claim 2, characterized in that: The foot pedal assembly includes a column with its top end fixed to the front end of the seat plate assembly, a mounting base that is adjustablely fixed to the column, and a pedal mounted on the front side of the mounting base. The pedal is connected and fixed to the mounting base at an adjustable angle via a transverse axis.

6. The folding wheelchair structure with interchangeable seat orientation according to claim 1, characterized in that: The four-bar linkage includes a forward-angled long bar extending from the push handle to the front wheel, a rear support bar extending diagonally from the middle of the forward long bar to the rear wheel, and a lower support bar spanning between the front wheel and the rear wheel. The upper end of the rear support bar is hinged to the middle of the forward long bar, the lower end of the rear support bar is hinged to the rear end of the lower support bar, and the front end of the lower support bar is hinged to the bottom end of the forward long bar. The upper end of the rear support bar is also provided with a folding locking mechanism for fixing to the forward long bar at the point beyond the hinge point.

7. The folding wheelchair structure with interchangeable seat orientation according to claim 6, characterized in that: The folding locking mechanism includes a sleeve section at the lower end of the front long rod, a long rod section with its lower end inserted into the sleeve section, an elongated through hole along its length on the sleeve section, an elongated locking hole along its length at the lower end of the long rod section, a latching structure that restricts the long rod section from being inserted into a specific position on the sleeve section, and a locking pin extending from the top end of the rear support rod for passing through the elongated through hole and inserting into the elongated locking hole. When the latching structure is locked, the elongated through hole and the elongated locking hole together clamp and lock the locking pin. When the latching structure is released, pushing the long rod section downward and pressing it down with the push handle allows the locking pin to slide out from the elongated locking hole and the elongated through hole, thereby folding the four-bar linkage.

8. The folding wheelchair structure with interchangeable seat orientation according to claim 1, characterized in that: The two rear wheels are rotatably mounted at both ends of a transverse rear beam, and the frame is fixedly mounted to the rear beam. An external gear is concentrically fixedly mounted on the inner side of each rear wheel, and a rotatable brake pedal is mounted on the frame. The brake pedal is equipped with a brake lever. When the brake pedal is pressed down, the brake lever can fall into the tooth groove of the external gear to prevent the rear wheels from rotating.

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