Rotatable backrest chair and electric wheelchair
By designing a rotatable backrest and locking mechanism on the electric wheelchair, the problem of the traditional electric wheelchair's backrest being unable to be adjusted has been solved, enabling angle adjustment according to the user's needs and improving user comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HONGYU HEALTH TECHNOLOGY CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-26
AI Technical Summary
The fixed backrest of traditional electric wheelchairs cannot be adjusted according to the user's physical condition and posture needs, resulting in discomfort in the waist and back during prolonged use.
Design a chair with a rotatable backrest that allows for multi-angle adjustment of the backrest through a locking mechanism, including components such as locking parts, linkage parts, and elastic parts, allowing the backrest to be adjusted to a suitable angle and fixed according to the user's needs.
With its rotatable backrest design, users can adjust the seat angle as needed, reducing lower back and back fatigue and improving comfort.
Smart Images
Figure CN224403899U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transportation, and in particular to a seat with a rotatable backrest and an electric wheelchair. Background Technology
[0002] Electric wheelchairs, as a means of transportation to assist people with mobility impairments, have been widely used in homes, medical institutions, nursing homes, and other settings. Traditional electric wheelchairs typically feature a fixed backrest structure. While this design meets basic user needs to some extent, it still presents several inconveniences in actual use. In current technology, fixed backrests cannot be adjusted according to the user's physical condition and posture requirements, potentially leading to fatigue, especially discomfort in the lower back and back, after prolonged use. Utility Model Content
[0003] To address the shortcomings of existing technologies, this invention provides a seat with a rotatable backrest and an electric wheelchair, enabling an electric wheelchair that can be adjusted according to the user's needs.
[0004] To this end, in a first aspect, one embodiment provides a seat with a rotatable backrest, including a base, a backrest, and a locking mechanism. The locking mechanism includes a locking member, the backrest is rotatably connected to the base, the base is provided with not less than two locking parts corresponding to the backrest, the locking parts are arranged circumferentially along the rotation axis of the backrest, and the locking member is used to mate with the locking parts to prevent the backrest from rotating relative to the base.
[0005] As a further alternative to the seat with the rotatable backrest, the locking mechanism further includes a first elastic element, the two ends of which are respectively connected to the locking element and the backrest.
[0006] As a further alternative to the rotatable backrest seat, the locking mechanism further includes linkages, of which there are at least two. Each linkage includes a first inclined surface, and the locking member abuts against the first inclined surface. When the linkage moves along a direction perpendicular to the rotation axis of the backrest, the locking member moves along the first inclined surface to move the locking member relative to the backrest.
[0007] As a further alternative to the seat with the rotatable backrest, the locking mechanism further includes a second elastic element, the two ends of which are respectively connected to the backrest and the linkage so that the linkage can be reset after being moved.
[0008] As a further alternative to the rotatable backrest seat, the locking mechanism also includes a toggle member, which is fixedly connected to the linkage member.
[0009] As a further alternative to the seat with the rotatable backrest, the backrest is provided with a groove, and the actuating element is restricted to move within the groove.
[0010] As a further alternative to the seat with the rotatable backrest, the backrest is provided with an assist portion, which is located at the extension of the actuating member in the direction of movement.
[0011] As a further alternative to the seat with the rotatable backrest, the locking member is also provided with a second inclined surface, which abuts against the first inclined surface.
[0012] As a further alternative to the seat with the rotatable backrest, the locking mechanism includes a fastener, and the linkage has a strip hole, through which the fastener is partially inserted and fixed to the backrest.
[0013] In a second aspect, one embodiment provides an electric wheelchair, including a body, wheels, and a seat with a rotatable backrest as described in any of the first aspects.
[0014] Implementing the embodiments of this utility model will have the following beneficial effects:
[0015] According to the rotatable backrest seat in the above embodiments, the backrest is rotatably connected to the base, and the base is provided with at least two locking parts corresponding to the seat, and the locking parts are arranged circumferentially along the rotation axis of the backrest. The locking element is movably disposed on the backrest, and when the backrest rotates, the locking element can correspond to different locking parts. This allows the backrest to have different angles relative to the base to accommodate different user scenarios. When the user adjusts the backrest to a suitable angle, the locking element is moved to engage with the locking part, thereby fixing the backrest.
[0016] The electric wheelchair according to the above embodiments is an electric wheelchair with a seat that can rotate to adjust according to the user's needs. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] in:
[0019] Figure 1 A schematic diagram of the overall structure of an electric wheelchair according to an embodiment of the present invention is shown;
[0020] Figure 2A schematic diagram of the overall structure of a seat with a rotatable backrest provided according to an embodiment of the present invention is shown.
[0021] Figure 3 A schematic diagram of the overall structure of a seat with a rotatable backrest provided according to an embodiment of the present invention is shown at another angle.
[0022] Figure 4 An exploded view of a seat with a rotatable backrest provided according to an embodiment of the present invention is shown.
[0023] Figure 5 It shows according to Figure 2 Schematic diagram of the cross section at point AA along the middle;
[0024] Figure 6 It shows Figure 5 A magnified view of a portion of point A in the middle;
[0025] Figure 7 An assembly diagram of a linkage and locking component according to an embodiment of the present utility model is shown;
[0026] Figure 8 A schematic diagram of the overall structure of a linkage component provided according to an embodiment of the present utility model is shown.
[0027] Explanation of key component symbols:
[0028] Base-10; Backrest-20; Locking mechanism-30; Locking component-310; Locking part-110; First elastic component-320; Linkage component-330; First inclined surface-3310; Second elastic component-340; Actuating component-3110; Pin-3120; Slide groove-210; Auxiliary actuation part-220; Second inclined surface-3130; Strip hole-3320; Body-100; Wheel-200; First housing-230; Second housing-240. Detailed Implementation
[0029] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0030] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0032] Firstly, this utility model provides a seat with a rotatable backrest, please refer to... Figures 2-8 The device includes a base 10, a backrest 20, and a locking mechanism 30. The locking mechanism 30 includes a locking member 310. The backrest 20 is rotatably connected to the base 10. The base 10 is provided with at least two locking parts 110 corresponding to the backrest 20. The locking parts 110 are arranged circumferentially along the rotation axis of the backrest 20. The locking member 310 is used to mate with the locking part 110 to prevent the backrest 20 from rotating relative to the base 10.
[0033] According to the rotatable backrest seat in the above embodiments, the backrest 20 is rotatably connected to the base 10. The base 10 is provided with at least two locking parts 110 corresponding to the seat, and the locking parts 110 are arranged circumferentially along the rotation axis of the backrest 20. A locking member 310 is movably disposed on the backrest 20. When the backrest 20 rotates, the locking member 310 can correspond to different locking parts 110. This allows the backrest 20 to have different angles relative to the base 10, accommodating different user scenarios. When the user adjusts the backrest 20 to a suitable angle, the locking member 310 is moved to engage with the locking part 110, thereby fixing the backrest 20.
[0034] The base 10 is mainly used to support the user, while the backrest 20 provides back support. The locking mechanism between the locking element 310 and the locking part 110 can be achieved in various ways. For example, the locking element 310 may have a pin 3120, and the locking part 110 may have multiple pin holes. Inserting the pin 3120 into these holes will naturally prevent relative rotation between the locking element 310 and the base 10. Conversely, if the locking element 310 has pin holes and the locking part 110 is a pin, it can also achieve the purpose of locking the backrest 20. Because the pin 3120 is subject to significant shearing forces, it is generally made of metal. The locking element 310 and the base 10 are typically injection molded as a single unit, and then the pin 3120 is assembled onto either the locking element 310 or the base 10.
[0035] Alternatively, a keyway structure can be used between the locking member 310 and the locking part 110 to switch between locking and unlocking the backrest 20. Or, the locking member 310 and the locking part 110 can also be locked together using magnetic attraction and friction. There are various locking methods between the locking member 310 and the locking part 110; any method that enables the backrest 20 to lock or unlock with the base 10 falls within the protection scope of this utility model.
[0036] In some specific embodiments, the locking mechanism 30 further includes a first elastic element 320, the two ends of which are respectively connected to the locking element 310 and the backrest 20.
[0037] The first elastic element 320 primarily enables the locking mechanism 30 to reset. When the force applied to the locking element 310 is removed, the first elastic element 320 allows the locking element 310 to reset, thereby locking it to the locking part 110. The first elastic element 320 is generally a spring. The first elastic element 320 allows the user to rotate the backrest 20 by a certain angle after moving the locking element 310, freeing one hand and facilitating the adjustment of the rotation angle of the backrest 20.
[0038] In some specific embodiments, please refer to Figures 4-6 The locking mechanism 30 also includes a linkage 330. There are at least two locking elements 310. The linkage 330 includes a first inclined surface 3310. The locking element 310 abuts against the first inclined surface 3310. When the linkage 330 moves along the rotation axis perpendicular to the backrest 20, the locking element 310 moves along the first inclined surface 3310 to move relative to the backrest 20.
[0039] Typically, there are two locking elements 310, symmetrically arranged on both sides of the backrest 20. For the user, simultaneously moving both locking elements 310 and rotating the backrest 20 is quite difficult. The linkage element 330 can simultaneously engage both locking elements 310, allowing the user to unlock the backrest 20 with just one hand while using the other to rotate it.
[0040] Specifically, the first inclined surface 3310 of the linkage 330 abuts against the locking member 310. When the linkage 330 moves in a direction perpendicular to the rotation axis of the backrest 20, it simultaneously drags the two locking members 310, causing them to move away from the locking part 110, thereby unlocking the locking member 310 from the locking part 110. The locking member 310 is restricted to moving only along the rotation axis of the backrest 20. When the locking member 310 moves along the first inclined surface 3310, the sum of the lengths of the locking member 310 and the linkage 330 along the rotation axis of the backrest 20 changes. This ultimately achieves the engagement / disengagement of the locking member 310 from the locking part 110.
[0041] It should be noted that in this embodiment, the locking member 310 moves axially along the rotation axis of the backrest 20. In other embodiments, the movement of the locking member 310 can take other forms. For example, the locking member 310 is rotatably connected to the backrest 20, and when the linkage member 330 moves, the linkage member 330 drives the locking member 310 to rotate relative to the backrest 20, thereby realizing the engagement and disengagement of the locking member 310 and the locking part 110.
[0042] In some specific embodiments, please refer to Figure 4 The locking mechanism 30 also includes a second elastic member 340, the two ends of which are connected to the backrest 20 and the linkage member 330 respectively so that the linkage member 330 can be reset after being moved.
[0043] In this embodiment, the function of the second elastic element 340 is to reset the linkage element 330 after the user's force is removed. In actual operation, when the locking element 310 is unlocked, the linkage element 330 generally needs to be moved upward. After the user's force is removed, the linkage element 330 resets under the action of gravity. However, considering the friction between the linkage element 330 and the backrest 20, the second elastic element 340 is provided to overcome the friction between the linkage element 330 and the backrest 20. The second elastic element 340 is generally a spring, and the unlocking force can be adjusted by the magnitude of the spring force.
[0044] In some specific embodiments, please refer to Figure 2 and Figure 4 The locking mechanism 30 also includes a toggle member 3110, which is fixedly connected to the linkage member 330.
[0045] The actuating component 3110 is mainly for the user to manually move, thereby causing the linkage component 330 to move together. The actuating component 3110 and the linkage component 330 can be injection molded as a single piece, or they can be processed separately and then assembled into a whole.
[0046] In some specific embodiments, the backrest 20 is provided with a groove 210, and the actuating member 3110 is restricted to move in the groove 210.
[0047] The backrest 20 is typically formed by two shells joined together. The backrest 20 has a receiving space within which the locking member 310, the first elastic member 320, the second elastic member 340, and the linkage member 330 are all housed. The slide groove 210 guides the movement of the actuating member 3110, guiding the user to correctly locate the actuating direction of the member 3110. Furthermore, it prevents the actuating member 3110 from jamming with the backrest 20 during movement.
[0048] In some specific embodiments, please refer to Figure 2 The backrest 20 is provided with an assist part 220, which is located at the extension of the moving part in the direction of movement.
[0049] In this embodiment, the assist part 220 is for convenient use with the actuating member 3110. When using the actuating member 3110, the user holds the stationary member and the assist part 220 with their index finger and thumb respectively, causing the actuating member 3110 to move towards the assist part 220. Specifically, the assist part 220 can be a groove, the inner wall of which can provide support for the user's fingers. Alternatively, the assist part 220 can be a protrusion, which can also serve as support for the user's fingers.
[0050] In some specific embodiments, please refer to Figure 6 The locking member 310 is also provided with a second inclined surface 3130, which abuts against the first inclined surface 3310.
[0051] The second inclined surface 3130 of the locking member 310 can further increase the movable distance of the locking member 310. That is, the first inclined surface 3310 and the second inclined surface 3130 have a superimposed effect, which greatly increases the movable distance of the locking member 310, thereby ensuring that the engagement and disengagement action between the pin 3120 and the locking part 110 can be in place.
[0052] Please refer to Figures 5-8 The linkage 330 moves up and down, while the locking member 310 moves horizontally left and right. The function of the first inclined surface 3310 and the second inclined surface 3130 is that when the linkage 330 moves upward, the locking member 310 can move horizontally inward. The movement distance of the locking member 310 is adjusted by the slope angle of the first inclined surface 3310 and the second inclined surface 3130 and the movement distance of the linkage 330.
[0053] In other words, the maximum distance that the locking member 310 can move is equal to the sum of the height difference between the two ends of the first inclined plane 3310 and the height difference between the two ends of the second inclined plane 3130. Here, the height difference refers to the reference... Figure 6 In the middle, the distance between the two ends of the first inclined plane 3310 (or the second inclined plane 3130) in the left-right direction.
[0054] In some specific embodiments, the locking mechanism 30 includes a fastener, and the linkage 330 is provided with a strip hole 3320. The fastener part passes through the strip hole 3320 and is fixed to the backrest 20.
[0055] The slotted hole 3320 serves two purposes: firstly, it ensures that the movement direction of the linkage 330 is only perpendicular to the rotation axis of the backrest 20; secondly, it facilitates the installation of the locking element 310.
[0056] The backrest 20 includes a first housing 230 and a second housing 240, which together form a receiving space. First, the locking member 310 and the second elastic member 340 are installed on the first housing 230. Then, the linkage member 330 is partially covered by the locking member 310 and fastened to the first housing 230. Next, the actuating member 3110 is installed on the linkage member 330. Finally, the second housing 240 is covered to complete the installation process of the locking mechanism 30 and the backrest 20.
[0057] Secondly, this utility model provides an electric wheelchair, please refer to... Figure 1 It includes a vehicle body 100, wheels 200, and a seat with a rotatable backrest on any of the first aspects.
[0058] The electric wheelchair according to the above embodiments is an electric wheelchair with a seat that can rotate to adjust according to the user's needs.
[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0060] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A seat with a rotatable backrest, characterized in that, The device includes a base, a backrest, and a locking mechanism. The locking mechanism includes a locking element. The backrest is rotatably connected to the base. The base has at least two locking parts corresponding to the backrest. The locking parts are arranged circumferentially along the rotation axis of the backrest. The locking element is used to mate with the locking parts to prevent the backrest from rotating relative to the base.
2. The rotatable backrest seat as described in claim 1, characterized in that, The locking mechanism further includes a first elastic element, the two ends of which are respectively connected to the locking element and the backrest.
3. The rotatable backrest seat as described in claim 1, characterized in that, The locking mechanism further includes a linkage member, and there are at least two locking members. The linkage member includes a first inclined surface, and the locking member abuts against the first inclined surface. When the linkage member moves along a direction perpendicular to the rotation axis of the backrest, the locking member moves along the first inclined surface to move the locking member relative to the backrest.
4. The rotatable backrest seat as described in claim 3, characterized in that, The locking mechanism further includes a second elastic element, the two ends of which are connected to the backrest and the linkage respectively so that the linkage can be reset after being moved.
5. The rotatable backrest seat as described in claim 3, characterized in that, The locking mechanism also includes a toggle element, which is fixedly connected to the linkage element.
6. The rotatable backrest seat as described in claim 5, characterized in that, The backrest is provided with a sliding groove, and the actuating member is restricted to move within the sliding groove.
7. The rotatable backrest seat as described in claim 6, characterized in that, The backrest is provided with an assist part, which is located at the extension of the moving part in the direction of movement.
8. The rotatable backrest seat as described in claim 6, characterized in that, The locking member is further provided with a second inclined surface, which abuts against the first inclined surface.
9. The rotatable backrest seat as described in claim 6, characterized in that, The locking mechanism includes a fastener, and the linkage has a strip hole. The fastener passes through the strip hole and is then fixed to the backrest.
10. An electric wheelchair, characterized in that, Includes the vehicle body, wheels, and a seat with a rotatable backrest as described in any one of claims 1-9.