Built-in folding locking structure of backrest armrest of electric wheelchair

Abstract

The utility model discloses an electric wheelchair backrest armrest built-in folding locking structure which comprises a connecting shaft end arranged on a backrest and used for being connected with an armrest body, and the armrest body is provided with a set rotating angle with the connecting shaft end as the center. A locking piece used for locking the armrest body at a set angle position is arranged in the connecting shaft end, and an unlocking piece used for unlocking the locking piece and the armrest body is arranged on the armrest body. The connecting mode of the armrests and the wheelchair backrest is adopted, the turning and folding actions are simplified, the structural stability is improved, the locking piece and the unlocking piece are arranged at the connecting shaft end position, turning and locking of the armrests relative to the backrest are achieved, meanwhile, the unlocking piece is arranged at the connecting shaft end position and is not prone to making contact with a user in the using process, and the using effect is good. The position stability of the armrest during riding is ensured, and the comfort and the safety are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of electric wheelchairs and relates to a built-in folding and locking structure for the backrest and armrests of an electric wheelchair. Background Technology

[0002] Electric wheelchairs are becoming increasingly popular among people with mobility impairments and the elderly. Electric wheelchairs are usually equipped with armrests on both sides for users to place their arms and for control levers and buttons to facilitate operation. To make it easier for users to get in and out of the wheelchair, the armrests are often designed to be movable and can be flipped up and down. Traditional flip-up armrests use a simple limiting structure with axles, steps, blocks, etc., which can be easily triggered by the force of the user's hands during use, causing the armrest to move. This may cause the user to panic and affect the stability and comfort of the user while riding. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides an electric wheelchair backrest armrest with a built-in folding and locking structure.

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

[0005] An electric wheelchair backrest armrest with built-in folding and locking structure includes a connecting shaft end disposed on the backrest for connecting to the armrest body, the armrest body having a set rotation angle centered on the connecting shaft end; a locking member disposed inside the connecting shaft end for locking the armrest body at the set angle position; and an unlocking member disposed on the armrest body for unlocking the locking member from the armrest body.

[0006] Furthermore, the connecting shaft end includes a frustum, a limiting ring is provided on the circumference of the frustum, a notch with a set angle is provided on the limiting ring along the circumference, the handrail body is provided with a circular hole for coaxially fitting outside the limiting ring, a stop is provided on the inner circumferential wall of the circular hole, and the stop is located inside the notch.

[0007] Furthermore, the truncated cone has a first connecting hole through the center for inserting a bolt, a cylinder for inserting into the limiting ring is provided in the center of the hole, and a second connecting hole for inserting a bolt is provided in the center of the cylinder. The first connecting hole and the second connecting hole are coaxially arranged.

[0008] Furthermore, an arc groove is provided at the bottom of the circular hole, the arc groove is located on the outer periphery of the cylinder, the locking member is sleeved on the outside of the cylinder, the locking member and the limiting ring are engaged to form a circumferential limit, the locking member is provided with a protruding inclined platform for extending into the arc groove, and a spring is provided between the locking member and the circular platform for providing axial elastic force to the locking member.

[0009] Furthermore, the arc groove extends through the circular hole along its axial direction, and the unlocking component includes a cover plate and a top rod connected to one end of the cover plate, the top rod passing through the arc groove.

[0010] Furthermore, the ramp is arranged circumferentially along the locking member, the lower end of the ramp is connected to the end face of the locking member, and the direction from the lower end of the ramp to the higher end is opposite to the upward movement direction of the handrail body.

[0011] In summary, the advantages of this utility model are as follows:

[0012] This utility model adopts a connection form between the armrest and the wheelchair backrest, which simplifies the flipping and folding action and improves structural stability. A locking and unlocking component is set at the end of the connecting shaft to realize the flipping and locking of the armrest relative to the backrest. At the same time, the unlocking component is set at the end of the connecting shaft so that it is not easy to come into contact with the user during use, ensuring the stability of the armrest position during riding and ensuring comfort and safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the backrest armrest of this utility model.

[0014] Figure 2 This is an exploded view of the internal folding locking structure.

[0015] Figure 3 for Figure 2 A schematic diagram of the explosion structure from another perspective.

[0016] Figure 4 This is a schematic diagram of the structure of the two connecting shaft ends.

[0017] The diagram shows the following markings: 1. Handrail body; 11. Round hole; 12. Cylinder; 13. Second connecting hole; 14. Arc groove; 2. Connecting shaft end; 21. Frustum; 22. Limiting ring; 221. Notch; 222. Slot; 23. First connecting hole; 31. Locking element; 311. Inclined platform; 312. Block; 32. Spring; 331. Cover plate; 332. Top rod. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] This embodiment provides a built-in folding and locking structure for the backrest and armrest of an electric wheelchair, as shown in the reference. Figure 1 It includes an armrest body 1 and a connecting shaft end 2, wherein the connecting shaft end 2 is located on one side of the back of the electric wheelchair, the rear end of the armrest body 1 is connected to the connecting shaft end 2, the front end extends towards the front of the backrest, and the armrest body 1 moves within a set range with the connecting shaft end 2 as the center.

[0023] Reference Figure 2 and Figure 3 The connecting shaft end 2 includes a frustum 21. A first connecting hole 23 is provided axially through the center of the end face of the frustum 21. A limiting ring 22 is provided circumferentially around the end face of the frustum 21, and a notch 221 is provided on the limiting ring 22. The notch 221 is set at a set angle along the circumference of the limiting ring 22.

[0024] The rear end of the handrail body 1 is recessed with a circular hole 11. A cylinder 12 extends axially from the center of the bottom surface of the circular hole 11. A second connecting hole 13 is axially through the cylinder 12. The circular hole 11 and the frustum 21 are coaxially connected, so that the limiting ring 22 is inserted between the outer wall of the cylinder 12 and the inner wall of the circular hole 11, so that the cylinder 12 is inserted inside the limiting ring 22 and the end face of the cylinder 12 abuts against the end face of the frustum 21. At this time, a bolt is simultaneously inserted through the first connecting hole 23 and the second connecting hole 13 to limit the handrail body 1 and the connecting shaft end 2 axially.

[0025] A stop is provided at a predetermined position on the inner circumferential wall of the circular hole 11. When the handrail body 1 is connected to the connecting shaft end 2, the stop is positioned in the notch 221 of the limiting ring 22. When the handrail body 1 rotates relative to each other, the stop is blocked by the two side walls of the notch 221, thereby limiting the rotation range of the handrail body 1 to a predetermined angle close to the notch 221. In this embodiment, the predetermined angle of the notch 221 is preferably ninety degrees. The positions of the stop when it abuts against the two side walls of the notch 221 are the lowered position and the uppered position of the handrail body 1, respectively.

[0026] Furthermore, in this embodiment, a locking member 31 and an unlocking member are provided to lock and switch the armrest body 1 between the lowered position and the flipped-up position. The locking member 31 has a ring structure, which is located on the inner circumference of the limiting ring 22 and sleeved on the outer circumference of the cylinder 12. A slot 222 is provided on the inner circumferential wall of the limiting ring 22, and the slot 222 has an opening that is connected along the axial direction of the limiting ring 22. A locking block 312 is provided radially protruding from the outer circumference of the locking member 31. The locking member 31 is coaxially arranged on the inner side of the limiting ring 22, so that the locking block 312 is inserted into the slot 222, which restricts the circumference of the locking member 31, so that the locking member 31 can move along the axial direction, but cannot rotate.

[0027] An inclined platform 311 is provided on the end face of the locking member 31 facing the circular hole 11 in the axial direction. The inclined platform 311 is set with a set arc along the circumference of the locking member 31. The lower end of the inclined platform 311 is connected to the end face of the locking member 31, and the higher end of the inclined platform 311 protrudes from the end face of the locking member 31 by a set axial distance. Correspondingly, an arc groove 14 is provided on the bottom surface of the circular hole 11. The arc groove 14 is located on the outer periphery of the cylinder 12 and is set in the circumferential direction, so that when the handrail body 1 is at a set angle relative to the connecting shaft end 2, the inclined platform 311 can extend into the arc groove 14. In this embodiment, when the handrail body 1 is in the lowered position, the inclined platform 311 extends into the arc groove 14.

[0028] A spring 32 is also provided between the locking member 31 and the truncated cone 21. The spring 32 provides elastic force to the locking member 31 in the axial direction toward the circular hole 11, so that when the handrail body 1 is in the lowered position, it pushes the locking member 31 to move axially and causes the inclined platform 311 to enter the arc groove 14.

[0029] by Figure 4 As shown for reference, when the handrail body 1 switches from the lower position to the upper position, the handrail body 1 rotates counterclockwise. Therefore, the tilting direction of the lower end of the inclined platform 311 to the upper end is clockwise. When the inclined platform 311 is located in the arc groove 14, the inclined platform 311 and the arc groove 14 form a counterclockwise contact with the handrail body 1, locking the handrail body 1 in the lower position and preventing it from moving.

[0030] The outer side of the handrail body 1 is provided with a mounting groove for installing the unlocking component. The other end of the arc groove 14 extends along the axial direction of the circular hole 11 to communicate with the mounting groove. The unlocking component includes a cover plate 331 and a top rod 332 extending along the axial direction of the cover plate 331. The top rod 332 passes through the arc groove 14 along the axial direction. The end of the top rod 332 can abut against the inclined platform 311 and thus push the locking component 31 to move axially.

[0031] When the handrail body 1 is in the lowered position and locked by the locking member 31, the top rod 332 is pushed inward by pressing the cover plate 331. The top rod 332 abuts against the inclined platform 311 and pushes the locking member 31 to move axially, so that the inclined platform 311 is disengaged from the arc groove 14. At this time, the handrail body 1 is unlocked and can be switched to the upward flip position.

[0032] When the handrail body 1 is in the upward position, the inclined platform 311 disengages from the arc groove 14 and abuts against the bottom surface of the round hole 11, without locking the handrail body 1. At this time, the posture of the handrail body 1 is maintained by its own center of gravity, and the user can directly rotate the handrail body 1 to switch it to the downward position. The movement from the upward position to the downward position is clockwise, which is the same as the tilting direction of the inclined platform 311. Therefore, it will not be blocked by the locking member 31 during the movement. When the handrail body 1 moves to the downward position, the locking member 31 is pushed by the spring 32 to make the inclined platform 311 enter the arc groove 14, relock the handrail body 1, and reset the unlocking member.

[0033] The inclined platform 311 and the arc groove 14 are set to three. In this embodiment, it is preferred that the number of inclined platforms 311 is set to three, and the number of arc grooves 14 is also set to three in a circular array along the circumference of the locking member 31, thereby enhancing the structural stability during locking.

[0034] 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 built-in folding and locking structure of an electric wheelchair backrest armrest, characterized in that, It includes a connecting shaft end (2) disposed on the backrest for connecting with the armrest body (1), the armrest body (1) having a set rotation angle centered on the connecting shaft end (2); a locking member (31) for locking the armrest body (1) at the set angle position is disposed inside the connecting shaft end (2); and an unlocking member for unlocking the locking member (31) from the armrest body (1) is disposed on the armrest body (1).

2. The folding and locking structure built in the backrest armrest of an electric wheelchair according to claim 1, characterized in that, The connecting shaft end (2) includes a frustum (21), and a limiting ring (22) is provided on the circumference of the frustum (21). A notch (221) with a set angle is provided on the limiting ring (22) along the circumference. A circular hole (11) is provided on the handrail body (1) for coaxially fitting outside the limiting ring (22). A stop is provided on the inner circumferential wall of the circular hole (11), and the stop is located inside the notch (221).

3. The folding and locking structure built in the backrest armrest of an electric wheelchair according to claim 2, characterized in that, The truncated cone (21) has a first connecting hole (23) for inserting a bolt through its center, and a cylinder (12) for inserting into the limiting ring (22) is provided in the center of the circular hole (11). The cylinder (12) has a second connecting hole (13) for inserting a bolt through its center, and the first connecting hole (23) and the second connecting hole (13) are coaxially arranged.

4. The folding and locking structure built in the backrest armrest of an electric wheelchair according to claim 3, characterized in that, The bottom of the circular hole (11) is provided with an arc groove (14), which is located on the outer periphery of the cylinder (12). The locking member (31) is sleeved on the cylinder (12). The locking member (31) is engaged with the limiting ring (22) to form a circumferential limit. The locking member (31) is provided with a protruding inclined platform (311) for extending into the arc groove (14). A spring (32) for providing axial elastic force to the locking member (31) is also provided between the locking member (31) and the cylindrical platform (21).

5. The folding and locking structure built in the backrest armrest of an electric wheelchair according to claim 4, characterized in that, The arc groove (14) is provided through the axial direction of the circular hole (11). The unlocking component includes a cover plate (331) and a top rod (332) connected to one end of the cover plate (331). The top rod (332) passes through the arc groove (14).

6. The electric wheelchair backrest armrest with built-in folding and locking structure according to claim 4 or 5, characterized in that, The ramp (311) is arranged around the circumference of the locking member (31). The lower end of the ramp (311) is connected to the end face of the locking member (31). The direction from the lower end of the ramp (311) to the upper end is opposite to the upward movement direction of the handrail body (1).

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