Multi-connecting-rod folding frame of electric wheelchair

Abstract

The utility model discloses an electric wheelchair multi-connecting-rod folding frame which comprises a sitting area support, a backrest support, a bottom support and a supporting cross beam, one end of the supporting cross beam is connected with the bottom support, the other end of the supporting cross beam is hinged to the front end of the sitting area support, the rear end of the sitting area support is hinged to the backrest support, and the backrest support is hinged to the bottom support. A rotating piece is further hinged to the backrest support, and one end of the rotating piece is hinged to the supporting cross beam. By adopting the multi-connecting-rod design, the key parts of the multi-connecting-rod section are rotated by applying force forwards or backwards, and the brackets of a plurality of parts on the frame can be fully folded or unfolded through rotation, so that the folding efficiency on the structure is better, the size change before and after the whole folding is large, and the folding effect is better. The requirement of small-size carrying during traveling can be well met; and the multi-connecting-rod structure is high in bearing capacity, pressure relief is conducted on the applied gravity from different parts, and the stability of the frame during unfolding is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of electric wheelchairs and relates to a multi-link folding frame for electric wheelchairs. Background Technology

[0002] With the development of technology and the improvement of people's living standards, the demand for electric wheelchairs in the market is increasing, and the demand for electric wheelchair storage and folding is also growing. Traditional wheelchairs are limited by the outdated design of the folding structure, the folding operation is cumbersome and complicated, the degree of folding is low, and the overall size after folding is still too large. It is difficult to fit into the space of some existing car trunks, so it cannot meet the frequent travel needs of users and the user experience is poor. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a multi-link folding frame for electric wheelchairs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An electric wheelchair multi-link folding frame includes a seating area support, a backrest support, a base support, and a support beam. One end of the support beam is connected to the base support, and the other end is hinged to the front end of the seating area support. The rear end of the seating area support is hinged to the backrest support. A rotating plate is also hinged to the backrest support, and one end of the rotating plate is hinged to the support beam.

[0006] Furthermore, it also includes an automatic locking hook, with a hook and a stop at each end of the automatic locking hook, a baffle for abutting against the stop on the backrest bracket, and a straight rod for cooperating with the hook on the seat bracket.

[0007] Furthermore, a connecting shaft is provided on the backrest bracket, the automatic locking hook passes through the connecting shaft, and a torsion spring is sleeved on the connecting shaft, the torsion spring holding the automatic locking hook in a set position.

[0008] Furthermore, one end of the automatic locking hook is also provided with a rod.

[0009] Furthermore, it also includes a footrest bracket and a support link, wherein the footrest bracket is hinged to the front end of the seating area bracket, and the two ends of the support link are respectively hinged to the footrest bracket and the rotating plate.

[0010] Furthermore, the hinge point between the support link and the rotating plate is located between the two hinge points between the rotating plate and the backrest bracket and the support beam.

[0011] Furthermore, the footrest bracket has a U-shaped structure.

[0012] Furthermore, the rear end of the seating area support forms an L-shaped bend, and the end of the L-shaped bend of the seating area support is hinged to the top of the backrest support.

[0013] In summary, the advantages of this utility model are as follows:

[0014] This invention employs a multi-link design. By applying force forward or backward, key components of the multi-link joints rotate, allowing multiple support components on the frame to fold or unfold fully. This results in better folding efficiency and a greater change in overall size before and after folding, making it well-suited for the need for compact portability. Furthermore, the multi-link structure boasts strong load-bearing capacity, dissipating applied gravity from different locations to ensure frame stability during unfolding. An automatic locking hook is incorporated; when the electric wheelchair is unfolded to its maximum critical section, the automatic locking hook engages to lock the frame, greatly simplifying user operation and enhancing the user experience. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the frame of this utility model in its unfolded state.

[0016] Figure 2 for Figure 1 The front view in the image.

[0017] Figure 3 for Figure 1 A schematic diagram of the structure of the backrest support.

[0018] Figure 4 for Figure 3 A schematic diagram of the explosion structure.

[0019] Figure 5 This is a schematic diagram of the frame in its folded state.

[0020] The diagram shows the following components: 1. Seating area support; 11. Straight rod; 2. Backrest support; 21. Rotating plate; 22. Connecting shaft; 3. Support beam; 4. Base support; 5. Footrest support; 6. Support link; 7. Automatic locking hook; 71. Hook; 72. Rod; 73. Stop; 74. Torsion spring. Detailed Implementation

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] In this embodiment of the invention, all directional indicators (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0024] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of this utility model may actually be an approximate parallel relationship, and the perpendicular relationship may actually be an approximate perpendicular relationship.

[0025] This embodiment provides a multi-link folding frame for electric wheelchairs, which is applied to the folding and storage needs of electric wheelchairs, enabling the electric wheelchair described in this embodiment to have an easily and quickly switchable unfolded use state and folded storage state.

[0026] The frame includes a seating area support 1, a footrest support 5, a backrest support 2, a bottom support 4, a support beam 3, and a support link 6. The bottom support 4 is located at the bottom to support the entire frame. One end of the support beam 3 is fixedly connected to the bottom support 4, and the other end is hinged to the middle of the seating area support 1 to support the seating area support 1. The footrest support 5 is hinged to the front end of the seating area support 1, and the rear end of the seating area support 1 is hinged to the backrest support 2. A rotating piece 21 is also hinged to the backrest support 2. The free end of the rotating piece 21 is hinged to the support beam 3. Furthermore, both ends of the support link 6 are hinged to the footrest support 5 and the rotating piece 21, respectively, thereby realizing the movable structure of the entire frame.

[0027] Specifically, the unfolded and folded states of the frame are switched by the relative movements of the various supports at multiple hinge points.

[0028] In the unfolded state, refer to Figure 1 and Figure 2The seating area support 1 is in a horizontal position. The front middle part of the seating area support 1 has a downward bend. The support beam 3 is inclined upward at a set angle. The bottom end of the support beam 3 is welded and fixed to the bottom support 4. The top end of the support beam 3 is hinged to the bend of the seating area support 1. At this time, the backrest support 2 is in a vertical position. The free end of the rotating piece 21 is fixed against the backrest support 2. The rear end of the seating area support 1 forms an L-shaped bend. The end of the bend is hinged to the top of the backrest support 2, so that the L-shaped part is folded into the backrest support 2 and fixed in abutting position. The seating area support 1, the backrest support 2, and the support beam 3 together form a triangular rigid support structure to maintain their relative positions.

[0029] The footrest bracket 5 has a U-shaped structure and is hinged to the downward-bending front end of the seat area bracket 1. In the unfolded state, the footrest bracket 5 is connected along the bending direction of the front end of the seat area bracket 1, so that the U-shaped bottom of the footrest bracket 5 forms an area for supporting the feet.

[0030] The front end of the support link 6 is hinged to the middle of the footrest bracket 5, and the rear end is hinged to the middle of the rotating plate 21. The rear end hinge point is located between the two hinge points of the rotating plate 21, the backrest bracket 2, and the support beam 3, so that the seat area bracket 1, the backrest bracket 2, the support link 6, and the footrest bracket 5 form a rigid support structure, which mainly provides support for the position of the footrest bracket 5.

[0031] During the transition from unfolded to folded state, refer to Figure 5 The backrest support 2 is moved backward and flipped from the vertical position to the horizontal position. On the one hand, the L-shaped part at the rear end of the seat area support 1 is opened relative to the backrest support 2, allowing the seat area support 1 to rotate and reduce the angle between the seat area support 1 and the support beam 3, thereby reducing the thickness of the overall frame. On the other hand, the rotating piece 21 is opened relative to the backrest support 2, increasing the included angle, and the rotating piece 21 is rotated backward relative to the support beam 3, thereby pulling the support link 6 to move backward, so that the footrest support 5 can be folded backward and stored at the bottom of the seat area support 1, thereby completing the folding of the entire frame and reducing its thickness and volume.

[0032] Furthermore, in order to maintain the stability of the frame structure and prevent movement at the hinge points when the frame is in the unfolded state, an automatic locking hook 7 is also provided in this embodiment, as shown in the reference. Figure 3 and Figure 4 The backrest bracket 2 is provided with a connecting shaft 22. The middle part of the automatic locking hook 7 passes through the connecting shaft 22 and can rotate relative to the connecting shaft 22. The automatic locking hook 7 is provided with a hook part 71 and a rod part 72 on opposite sides with the connecting shaft 22 as the center of symmetry. The rotation of the automatic locking hook 7 can be driven by applying force to the rod part 72.

[0033] The automatic locking hook 7 has a stop 73 in the middle, and a torsion spring 74 is sleeved on the connecting shaft 22. One end of the torsion spring 74 is fixed to the connecting shaft 22 or the backrest bracket 2, and the other end is fixed to the stop 73. When there is no other external force, the torsion spring 74 will keep the automatic locking hook 7 in the set position.

[0034] A baffle is provided on the backrest support 2, and a straight rod 11 is provided on the seat area support 1 for engaging with the hook 71. When the frame is in the unfolded state, the stop block 73 abuts against the baffle in the set position maintained by the torsion spring 74, and the hook 71 engages with the straight rod 11. At this time, the automatic locking hook 7 simultaneously limits the baffle and the straight rod 11, preventing the seat area support 1 from opening relative to the backrest support 2, thereby providing support and fixing for the relative positions of the two.

[0035] The lever 72 allows the user to push the automatic locking hook 7 to move when the frame is unfolded, causing the stop 73 to disengage from the baffle and the hook 71 to disengage from the straight rod 11, thereby releasing the restriction between the seat area support 1 and the backrest support 2, and allowing the frame to be switched to a folded state.

[0036] When the frame switches from the folded state to the unfolded state, the torsion spring 74 is mainly used to provide rotational force to the automatic locking hook 7. When the user opens the seat support 1 and the backrest support 2 to the unfolded position, the elastic force of the torsion spring 74 on the automatic locking hook 7 can drive the stop block 73 to abut against the baffle and the hook part 71 to engage with the straight rod 11. The automatic locking hook 7 can automatically complete the limit without the user's additional operation.

[0037] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A power wheelchair multi-link folding frame, characterized by, It comprises a seat support (1), a back support (2), a bottom support (4) and a support beam (3), one end of the support beam (3) is connected with the bottom support (4), the other end is hinged with the front end of the seat support (1), the rear end of the seat support (1) is hinged with the back support (2), and a rotating piece (21) is further hinged on the back support (2), one end of the rotating piece (21) is hinged with the support beam (3).

2. The electric wheelchair multi-link folding frame according to claim 1, wherein, It also comprises an automatic lock hook (7), both ends of the automatic lock hook (7) are respectively provided with a hook part (71) and a stop block (73), the back support (2) is provided with a baffle for abutting against the stop block (73), and the seat support (1) is provided with a straight rod (11) for cooperating with the hook part (71).

3. The electric wheelchair multi-link folding frame according to claim 2, wherein, The back support (2) is provided with a connecting shaft (22), the automatic lock hook (7) is arranged on the connecting shaft (22), a torsional spring (74) is sleeved on the connecting shaft (22), and the torsional spring (74) maintains the automatic lock hook (7) in a set position.

4. The electric wheelchair multi-link folding frame according to claim 3, wherein, One end of the automatic lock hook (7) is further provided with a rod part (72).

5. The electric wheelchair multi-link folding frame according to claim 1, wherein, It also comprises a foot support support (5) and a support connecting rod (6), the foot support support (5) is hinged with the front end of the seat support (1), and both ends of the support connecting rod (6) are respectively hinged with the foot support support (5) and the rotating piece (21).

6. The electric wheelchair multi-link folding frame according to claim 5, wherein, The hinged point of the support connecting rod (6) and the rotating piece (21) is located between the two hinged points of the rotating piece (21) and the back support (2) and the support beam (3).

7. The electric wheelchair multi-link folding frame according to claim 5, wherein, The foot support support (5) is in a U-shaped structure.

8. A multi-link folding frame for an electrically powered wheelchair according to any one of claims 1 to 7, wherein, The rear end of the seat support (1) is formed in an L-shaped bending, and the terminal end of the L-shaped bending of the seat support (1) is hinged with the top of the back support (2). The rear end of the seat support (1) is formed in an L-shaped bending, and the terminal end of the L-shaped bending of the seat support (1) is hinged with the top of the back support (2).

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