Push adjustment type wheelchair armrest

Abstract

The utility model discloses a kind of pressurized adjustment formula wheelchair handrails, including cylindrical support and handrail assembly, the cylindrical support is sequentially divided into first section, second section and third section along axial direction, the handrail assembly includes handrail, support rod, ring, one end of the handrail is connected with support rod, the support rod is integrated with ring, the ring is sleeved in the outer surface of the second section of cylindrical support, the inner wall of the ring is equipped with two radial inner protrusions with the depth adaptation of the radial inner concave limit area, the arc length of the radial inner concave limit area is greater than radial protrusion to allow ring to rotate within limit area at predetermined angle, the cylindrical support inside is equipped with axial counterbore, built-in axially movable pressure rod and spring between the abutment of counterbore step surface and pressure rod, by pressing pressure rod, the limiting of ring can be released, so that handrail can flexibly rotate within predetermined angle range, conveniently user according to self demand easily put down or lift handrail.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a press-adjustable wheelchair armrest. Background Technology

[0002] In the actual use of wheelchairs, the adjustability of the armrests is of great significance to the user's comfort and convenience. Most existing wheelchair armrests adopt a fixed or simple detachable structure. The fixed structure of the armrests cannot meet the needs of users in different scenarios. Especially for users who need to frequently get in and out of the wheelchair, the fixed height and angle of the armrests will hinder their movement, making it difficult to get in and out of the vehicle and posing certain safety hazards. While detachable armrests can be adjusted to a certain extent, the disassembly process is relatively cumbersome, requiring users to spend more time and effort to operate, and there is a possibility of damaging parts during the disassembly process, causing inconvenience.

[0003] Therefore, it is particularly necessary to develop a handrail device that allows users to easily adjust the angle according to their own needs. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model relates to a press-adjustable wheelchair armrest. This structure is simple and reliable, effectively solving the aforementioned technical problems and is suitable for widespread use. To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A press-adjustable wheelchair armrest includes a cylindrical support and an armrest assembly. The cylindrical support is divided into a first section, a second section and a third section along the axial direction. The first section has the largest diameter and is connected to the wheelchair frame. The second section has a smaller diameter than the first section and has two radially concave limiting areas symmetrically arranged around the center on its outer surface. The third section has the smallest diameter and has a threaded area on its outer surface.

[0006] The handrail assembly includes a handrail, a support rod, and a ring. One end of the handrail is connected to the support rod, and the support rod and the ring are integrated. The ring is sleeved on the outer surface of the second section of the cylindrical support member. The inner wall of the ring is provided with two radially concave protrusions that are adapted to the depth of the radially concave limiting area. The arc length of the radially concave limiting area is greater than the radial protrusions to allow the ring to rotate at a predetermined angle within the limiting area.

[0007] The cylindrical support has an axial countersunk hole inside, and a pressure rod that can move axially is built in, and a spring that abuts against the countersunk hole step surface and the pressure rod.

[0008] The pressure rod has two radially outward protrusions on its outer periphery. The third end face of the cylindrical support member to the middle of the first section has a through radial groove. In the non-pressed state, the radially outward protrusion of the pressure rod is inserted into the groove corresponding to the second section position to prevent the radial protrusion of the ring from rotating. When the pressure rod is pressed and the radially outward protrusion moves to the groove corresponding to the first section position, the restriction on the rotation of the ring is released.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the end of the pressure rod is provided with a pressing end cap, the outer diameter of which is larger than the diameter of the countersunk hole opening to form a pressing stroke limit.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: the third threaded connection has a limiting nut, which is used to limit the ring in the axial direction.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: the ring is provided with three bolt mounting holes evenly spaced around the circumference, the support rod is provided with threaded connection holes corresponding to the bolt mounting holes, and the ring and the support rod are connected as one unit by a threaded connection.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: the spring is a helical compression spring, and its preload keeps the radially outward protrusion of the pressure rod in a locked position when it is not pressed.

[0013] The outstanding and beneficial technical effect of this utility model compared with the prior art is that the limitation of the ring can be released by pressing the pressure rod, so that the armrest can rotate flexibly within a predetermined angle range. This makes it convenient for users to easily fold down or lift the armrest according to their own needs, greatly facilitating the process of getting in and out of the wheelchair and improving the convenience and comfort of wheelchair use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall external structure of the handrail;

[0015] Figure 2 This is a schematic diagram of the assembly of the ring and the support rod;

[0016] Figure 3 This is a diagram showing the installation position of the limit nut;

[0017] Figure 4 This is a schematic diagram of the support component;

[0018] Figure 5 This is a schematic diagram of a compression bar;

[0019] Figure 6 This is a schematic diagram of the connection of the press adjustment component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. However, the specific implementation methods and embodiments described below are for illustrative purposes only and are not intended to limit the present invention.

[0021] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The directions or positional relationships shown are for the purpose of describing this utility model only, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0023] To solve the above technical problems, such as Figure 1-6 As shown, this utility model designs a press-adjustable wheelchair armrest, including a cylindrical support 1 and an armrest assembly. The cylindrical support 1 is divided into a first section 101, a second section 102 and a third section 103 along the axial direction. The first section 101 has the largest diameter and is connected to the wheelchair frame (not shown in the figure). The second section 102 has a smaller diameter than the first section 101 and its outer surface is provided with two radially concave limiting areas 5 that are symmetrical around the center. The third section 103 has the smallest diameter and its outer surface is provided with a threaded area.

[0024] The handrail assembly includes a handrail 2, a support rod 3, and a ring 4. One end of the handrail 2 is connected to the support rod 3. The support rod 3 and the ring 4 are integrated. The outer side of the support rod 3 is covered by a protective shell. The ring 4 is fitted onto the outer surface of the second section 102 of the columnar support member 1. The inner wall of the ring 4 is provided with two radially concave protrusions 6 that are adapted to the depth of the radially concave limiting area 5. The arc length of the radially concave limiting area 5 is greater than that of the radial protrusions to allow the ring 4 to rotate at a predetermined angle within the limiting area.

[0025] The columnar support 1 has an axial countersunk hole inside, and a pressure rod 7 that can move axially is built in, and a spring 8 that abuts between the countersunk hole step surface and the pressure rod 7.

[0026] The pressure rod 7 has two radially outward protrusions 9 on its outer periphery. The third section 103 end face of the columnar support 1 is provided with a through radial groove 10 from the middle of the first section 101. In the non-pressed state, the radially outward protrusions 9 of the pressure rod 7 are inserted into the groove 10 corresponding to the position of the second section 102 to prevent the radial protrusions of the ring 4 from rotating. When the pressure rod 7 is pressed and the radially outward protrusions 9 are moved to the position of the groove 10 corresponding to the first section 101, the restriction on the rotation of the ring 4 is released.

[0027] By pressing the lever 7, the restriction on the ring 4 can be released, allowing the armrest 2 to rotate flexibly within a predetermined angle range. This design allows users to easily fold down or lift the armrest 2, greatly facilitating the process of getting in and out of the wheelchair and improving the convenience and comfort of wheelchair use. In the non-pressed state, the radially outward protrusion 9 of the lever 7 engages with the second section 102 through groove area of ​​the cylindrical support 1, firmly preventing the radial protrusion of the ring 4 from rotating, ensuring that the armrest 2 maintains a stable angle during use. The stability and reliability of this locking mechanism can effectively prevent the armrest 2 from loosening or shaking during use, providing reliable support and safety for the user. In addition, the entire adjustment mechanism is integrated inside the support, without occupying too much external space. This compact design not only maintains the simplicity of the overall structure of the wheelchair but also improves the reliability and durability of the device, while making the wheelchair's appearance cleaner and more aesthetically pleasing. The entire adjustment process can be completed simply by pressing the lever 7, without the need for tools or complicated operating steps, allowing users to independently adjust the armrest 2, enhancing user autonomy and convenience.

[0028] In this embodiment, it is further preferred that the end of the pressure rod 7 is provided with a pressing end cap 11, the outer diameter of which is larger than the diameter of the countersunk hole opening to form a pressing stroke limit. The end cap 11 provides the user with a convenient pressing operation surface, improves the comfort and convenience of operation, and effectively prevents the pressure rod 7 from excessively retracting into the column support 1 when moving axially, thus avoiding structural damage.

[0029] In this embodiment, it is further preferred that the third segment 103 is threadedly connected to a limiting nut 12. The limiting nut 12 is used to limit the ring 4 in the axial direction to prevent the ring 4 from sliding along the axial direction of the column support 1 due to external forces, thereby ensuring the connection reliability of the handrail assembly.

[0030] In this embodiment, it is further preferred that the ring 4 is provided with three bolt mounting holes 13 evenly spaced around the circumference, and the support rod 3 is provided with threaded connection holes corresponding to the bolt mounting holes 13. The ring 4 and the support rod 3 are connected as one unit by a threaded connection. The threaded connection provides a reliable mechanical connection, ensuring that the ring 4 and the support rod 3 can withstand large torque and tension, maintaining the stability of the structure. At the same time, the threaded connection facilitates disassembly and maintenance, making it convenient to adjust or replace the handrail assembly and extending the service life of the device.

[0031] In this embodiment, it is further preferred that the spring 8 is a helical compression spring, whose preload keeps the radially outward protrusion 9 of the pressure rod 7 in a locked position when not pressed, ensuring that the pressure rod 7 firmly locks the ring 4 when not pressed, preventing misoperation caused by vibration or external interference. The preload of the spring 8 can be adjusted according to actual usage requirements to adapt to different locking strength requirements, thereby improving the reliability and adaptability of the device.

[0032] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made by those skilled in the art based on the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A push-recline wheelchair arm rest, characterized by: It includes a columnar support and a handrail assembly. The columnar support is divided into a first section, a second section and a third section along the axial direction. The first section has the largest diameter and is connected to the wheelchair frame. The second section has a smaller diameter than the first section and has two radially concave limiting areas that are symmetrical about the center on its outer surface. The third section has the smallest diameter and has a threaded area on its outer surface. The handrail assembly includes a handrail, a support rod, and a ring. One end of the handrail is connected to the support rod, and the support rod and the ring are integrated. The ring is sleeved on the outer surface of the second section of the cylindrical support member. The inner wall of the ring is provided with two radially concave protrusions that are adapted to the depth of the radially concave limiting area. The arc length of the radially concave limiting area is greater than the radial protrusions to allow the ring to rotate at a predetermined angle within the limiting area. The cylindrical support has an axial countersunk hole inside, and a pressure rod that can move axially is built in, and a spring that abuts against the countersunk hole step surface and the pressure rod. The pressure rod has two radially outward protrusions on its outer periphery. The third end face of the cylindrical support member to the middle of the first section has a through radial groove. In the non-pressed state, the radially outward protrusion of the pressure rod is inserted into the groove corresponding to the second section position to prevent the radial protrusion of the ring from rotating. When the pressure rod is pressed and the radially outward protrusion moves to the groove corresponding to the first section position, the restriction on the rotation of the ring is released.

2. The push adjustable wheelchair armrest according to claim 1, wherein: The end of the pressure rod is provided with a pressing end cap, the outer diameter of which is larger than the diameter of the countersunk hole opening to form a pressing stroke limit.

3. The push to adjust wheelchair armrest of claim 1, wherein: The third threaded connection has a limiting nut, which is used to limit the ring in the axial direction.

4. The push to adjust wheelchair armrest of claim 1, wherein: The ring has three bolt mounting holes evenly spaced around the circumference, and the support rod has threaded connection holes corresponding to the bolt mounting holes. The ring and the support rod are connected as one unit by a threaded connection.

5. The push to adjust wheelchair armrest of claim 1, wherein: The spring is a helical compression spring, and its preload keeps the radially outward protrusion of the pressure rod in a locked position when it is not pressed.

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