Wheelchair brake self-locking device

Abstract

The utility model discloses a wheelchair brake self-locking device, which belongs to the technical field of wheelchairs and comprises a backrest support, wheels, a rear frame and a locking piece, the wheels are rotatably mounted at the lower end of the backrest support, the rear frame comprises a brake rod rotatably arranged on the backrest support, and the locking piece comprises a locking plate rotatably arranged on the backrest support. A limiting column capable of abutting against the backrest support is perpendicularly connected to the locking piece, the brake rod is located on the outer side of the locking piece, the outer side face of the locking piece is arranged to be an arc face, a locking groove is formed in the arc face in a sunken mode, the rear frame is rotated, the brake rod can slide along the arc face and push the locking piece to rotate, and when the brake rod moves to the position opposite to the locking groove, the locking piece is clamped on the brake rod through the locking groove. And the end parts of the brake rods are tightly pressed on the wheels. According to the wheelchair brake self-locking device, the structure is simplified, production and assembly are convenient, the wheels can be automatically locked by the locking pieces only by simply pressing down the rear frame, quick braking is facilitated, and use is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, in particular to a wheelchair brake self-locking device. Background Art

[0002] A wheelchair is a seat with wheels, which is mainly used for people with functional disabilities or other walking difficulties. A wheelchair is generally composed of a frame, a seat cushion, wheels, a backrest and a brake structure. The seat cushion and the backrest are fixed on the frame in the horizontal and vertical directions respectively. The wheels are divided into main and auxiliary wheels and are rotatably installed on the front and rear sides of the frame respectively. The brake structure is used to control the running state of the wheels to achieve braking.

[0003] The structure of traditional brake components is usually complicated. For example, the Chinese invention patent document with publication number CN220668200U discloses a lightweight brake mechanism for a wheelchair, which uses a fixed rod, a connecting plate, a handle and a brake shoe to form a connecting rod mechanism, and uses the dead point of the connecting rod mechanism to complete the braking. At the same time, a compression spring is set between the brake shoe and the handle to assist in moving the handle and the brake shoe. The above brake mechanism involves many parts, and the connection relationship between the parts is complicated, which is not conducive to production and assembly. Based on this, the inventor needs to improve the brake structure to simplify the structure and facilitate production and assembly. Utility Model Content

[0004] The technical problem to be solved by the utility model is that in the prior art, the brake mechanism for locking the wheelchair wheels has a complex structure, which is not conducive to production and assembly. Based on this, the utility model provides a wheelchair brake self-locking device with a simplified structure and easy production and assembly.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a wheelchair brake self-locking device, comprising a backrest bracket, a wheel, a rear frame and a locking piece, the wheel being rotatably mounted at the lower end of the backrest bracket, the rear frame comprising a brake rod rotatably arranged on the backrest bracket, the locking piece comprising a locking plate rotatably arranged on the backrest bracket, the locking plate being vertically connected to a limiting column that can abut against the backrest bracket, the brake rod is located at the outer side of the locking plate, the outer side surface of the locking plate is set as an arc surface, and a locking groove is recessed on the arc surface. When the rear frame is rotated, the brake rod can slide along the arc surface and push the locking plate to rotate, and when the brake rod moves to align with the locking groove, the locking plate is clamped on the brake rod through the locking groove, and the end of the brake rod is pressed tightly against the wheel.

[0006] Furthermore, the backrest bracket includes two oppositely arranged longitudinal rods and a fixing rod connected between the two longitudinal rods, the wheels have two wheels respectively arranged at the lower ends of the two longitudinal rods, the locking member also includes a connecting rod, the locking plates have two wheels symmetrically arranged at both ends of the connecting rod, and the two locking plates are respectively rotatably connected to the two longitudinal rods.

[0007] Furthermore, a limiting plate is fixedly connected to the longitudinal rod, and the limiting plate can be abutted against the limiting column.

[0008] Furthermore, a fixing pin is fixedly connected to the longitudinal rod, one end of the locking member away from the connecting rod is rotatably connected to the fixing pin, and the locking groove is arranged close to the fixing pin.

[0009] Furthermore, the brake lever comprises a locking section and a braking section which are connected to each other, the locking section can slide along the arc surface and be inserted into the locking groove, and the braking section can be pressed tightly against the wheel.

[0010] Furthermore, the rear frame also includes an articulated rod, the brake rod is fixedly connected to one end of the articulated rod, a clamp is fixedly connected to the bracket, and one end of the articulated rod away from the brake rod is hinged to the clamp.

[0011] Furthermore, the rear frame also includes an operating handle, the operating handle is an inverted U-shaped structure, and the operating handle is fixedly connected to the brake lever.

[0012] Furthermore, the locking groove is in a U-shaped structure.

[0013] The beneficial effects of the utility model are as follows: compared with the prior art, the wheelchair brake self-locking device of the utility model simplifies the structure, is easy to produce and assemble, and only requires a simple downward pressure operation on the rear frame to realize the automatic locking function of the locking member on the wheel, which is conducive to rapid braking and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a three-dimensional diagram of the wheelchair brake self-locking device of the utility model;

[0016] Figure 2 yes Figure 1 A partial enlarged view of the wheelchair brake self-locking device at point A shown;

[0017] Figure 3 yes Figure 1 A partial exploded view of the wheelchair brake self-locking device shown;

[0018] Figure 4 yes Figure 1 A schematic diagram of the structure of the wheelchair self-locking brake device when the wheels are not locked;

[0019] Figure 5 yes Figure 1 The schematic diagram of the structure of the wheelchair brake self-locking device in the process of locking the wheel;

[0020] Figure 6 yes Figure 1 The schematic diagram of the structure of the wheelchair brake self-locking device is shown in FIG.

[0021] In the figure: 10, backrest bracket, 11, longitudinal rod, 111, fixing pin, 112, limiting plate, 12, fixing rod, 13, clamping hoop, 20, wheel, 21, wheel hub, 22, tire, 30, rear frame, 31, brake lever, 311, locking section, 312, brake section, 32, hinged rod, 33, operating handle, 40, locking member, 41, locking plate, 411, limiting column, 412, arc surface, 413, locking groove, 42, connecting rod. DETAILED DESCRIPTION

[0022] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0023] See also Figure 1-Figure 6 The utility model provides a wheelchair brake self-locking device, including a backrest bracket 10, a wheel 20, a rear frame 30 and a locking member 40, wherein the wheel 20 is rotatably mounted at the lower end of the backrest bracket 10, the rear frame 30 and the locking member 40 are both rotatably mounted on the backrest bracket 10, the rear frame 30 includes a brake rod 31 that can be moved away from or close to the wheel 20, the locking member 40 includes a locking plate 41 rotatably arranged on the backrest bracket 10, and a locking plate 41 is vertically connected to the locking plate 41. The brake rod 31 is located on the outer side of the locking plate 41, and the outer side surface of the locking plate 41 is set as an arc surface 412. The arc surface 412 has a locking groove 413. When the rear frame 30 is rotated, the brake rod 31 can slide along the arc surface 412 and push the locking plate 41 to rotate. When the brake rod 31 moves to align with the locking groove 413, the locking plate 41 is clamped on the brake rod 31 through the locking groove 413, and the end of the brake rod 31 is pressed tightly against the wheel 20.

[0024] See also Figure 4 In the wheelchair brake self-locking device of the present invention, when the brake is not applied, the locking plate 41 relies on its own weight to make the limiting column 411 abut against the backrest bracket 10. At this time, the locking plate 41 is in a natural state, and the position of the locking plate 41 relative to the backrest bracket 10 remains stationary under the action of the limiting column 411.

[0025] When the brake operation is required, the rear frame 30 is rotated clockwise relative to the backrest bracket 10, thereby driving the brake lever 31 to rotate clockwise. When the brake lever 31 contacts the arc surface 412 and continues to rotate, the tangent point between the brake lever 31 and the arc surface 412 will slide along the contour of the arc surface 412, and at the same time, the brake lever 31 will overcome the gravity of the lock plate 41 itself and push the lock plate 41 to rotate counterclockwise (see Figure 5 As the rear frame 30 continues to rotate, until the brake rod 31 moves to align with the locking groove 413, the locking plate 41 automatically rotates clockwise under its own gravity and then the brake rod 31 is locked into the locking groove 413. At this time, the brake rod 31 is locked, and at the same time, the end of the brake rod 31 is pressed tightly against the outer ring surface of the wheel 20 to lock the wheel 20 (see Figure 6 ).

[0026] When the brake needs to be released, the lock plate 41 is lifted counterclockwise upward to disengage the brake lever 31 from the locking groove 413 . At this time, the brake lever 31 can be separated from the wheel 20 , thereby releasing the brake state.

[0027] See also Figure 1 , Figure 3 The backrest bracket 10 includes two longitudinal rods 11 arranged opposite to each other and a fixed rod 12 connected between the two longitudinal rods 11. The wheel 20 has two wheels, which are rotatably mounted on the lower ends of the two longitudinal rods 11. The wheel 20 includes a wheel hub 21 and a tire 22 arranged outside the wheel hub 21. As a preferred embodiment, the locking member 40 also includes a connecting rod 42, and the locking plates 41 have two locking plates 41, which are symmetrically fixedly connected to the two ends of the connecting rod 42, one of the locking plates 41 is rotatably connected to one of the longitudinal rods 11, and the other locking plate 41 is rotatably connected to the other longitudinal rod 11. During use, the two locking plates 41 move synchronously and can lock the brake lever 31 at the same time. By providing two mutually connected locking plates 41, the structural strength of the locking member 40 is enhanced, and the stability of the locking member 40 locking the brake lever 31 is also improved. In addition, in addition to being used to connect the two locking plates 41, the fixed rod 12 can also be grasped by the user to lift the locking member 40 upward, so that the user can release the brake state.

[0028] For further information, see Figure 2 A fixing pin 111 is fixedly connected to the longitudinal rod 11, and one end of the locking member 40 away from the connecting rod 42 is rotatably connected to the fixing pin 111, and the locking groove 413 is arranged near the fixing pin 111. In this embodiment, the locking groove 413 is a U-shaped structure to achieve stable locking of the brake lever 31.

[0029] In addition, a limit plate 112 is fixedly connected to the longitudinal rod 11, and the limit plate 112 can abut against the limit column 411. When the user holds the fixed rod 12 and lifts the locking member 40 upward, the locking member 40 rotates counterclockwise until the limit column 411 abuts against the limit plate 112, and the locking member 40 cannot continue to rotate. The limit plate 112 can limit the rotation travel of the locking member 40, which is convenient for operation.

[0030] Please refer again Figure 3 The brake lever 31 includes a locking section 311 and a brake section 312 connected to each other. The locking section 311 can slide along the arc surface 412 and snap into the locking groove 413, and the brake section 312 can be pressed tightly against the wheel 20. As a preferred embodiment, the brake lever 31 is a straight rod, and the brake section 312 has two sections that are respectively connected to the opposite ends of the locking section 311, and the locking section 311 and the brake section 312 are coaxially arranged. In other embodiments, the brake lever 31 can also be a bent shape, and the locking section 311 and the brake section 312 can be non-coaxially arranged. It is only necessary to make the locking section 311 slide along the arc surface 412 and snap into the locking groove 413, while the brake section 312 presses and locks the wheel 20. Of course, the shape of the brake section 312 can be a rod-shaped or a sheet-shaped brake pad, which is not limited here.

[0031] The rear frame 30 also includes an articulated rod 32, a brake rod 31 is fixedly connected to one end of the articulated rod 32, a clamp 13 is fixedly connected to the backrest bracket 10, and one end of the articulated rod 32 away from the brake rod 31 is hinged to the clamp 13. During operation, the brake rod 31 rotates around the hinge point between the clamp 13 and the articulated rod 32.

[0032] Furthermore, the rear frame 30 further includes an operating handle 33, which is generally in an inverted U-shaped structure, and is fixedly connected to the brake lever 31, and is used for the user to grasp and rotate the rear frame 30. In specific implementation, when the wheelchair is in a normal use state without locking the wheels 20, in order to prevent the rear frame 30 from deflecting by itself, the user can fix the operating handle 33 to the backrest bracket 10 through other fixing parts such as a strap, and when it is necessary to lock the wheels 20, the above fixing parts can be loosened, so as to facilitate the user to rotate the rear frame 30.

[0033] Compared with the prior art, the wheelchair brake self-locking device of the present invention simplifies the structure and is easy to produce and assemble. The automatic locking function of the locking member 40 on the wheel 20 can be achieved by simply pressing down the rear frame 30, which is conducive to rapid braking and reliable use.

[0034] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A wheelchair brake self-locking device, characterized in that: The invention comprises a backrest bracket, a wheel, a rear frame and a locking member, wherein the wheel is rotatably mounted on the lower end of the backrest bracket, the rear frame comprises a brake lever rotatably arranged on the backrest bracket, the locking member comprises a locking plate rotatably arranged on the backrest bracket, a limiting column which can be abutted against the backrest bracket is vertically connected to the locking plate, the brake lever is located at the outer side of the locking plate, the outer side surface of the locking plate is arranged as an arc surface, a locking groove is recessed on the arc surface, and the rear frame is rotated so that the brake lever can slide along the arc surface and push the locking plate to rotate, and when the brake lever moves to align with the locking groove, the locking plate is clamped on the brake lever through the locking groove, and the end of the brake lever is pressed tightly against the wheel.

2. The wheelchair brake self-locking device according to claim 1, characterized in that: The backrest bracket includes two oppositely arranged longitudinal rods and a fixing rod connected between the two longitudinal rods. The wheels have two wheels and are respectively arranged at the lower ends of the two longitudinal rods. The locking member also includes a connecting rod. The locking plates have two wheels and are symmetrically arranged at both ends of the connecting rod. The two locking plates are respectively rotatably connected to the two longitudinal rods.

3. The wheelchair brake self-locking device according to claim 2, characterized in that: The longitudinal rod is fixedly connected with a limiting plate, and the limiting plate can be abutted against the limiting column.

4. The wheelchair brake self-locking device according to claim 2, characterized in that: A fixing pin is fixedly connected to the longitudinal rod, one end of the locking member away from the connecting rod is rotatably connected to the fixing pin, and the locking groove is arranged close to the fixing pin.

5. The wheelchair brake self-locking device according to claim 1, characterized in that: The brake lever comprises a locking section and a brake section which are connected to each other. The locking section can slide along the arc surface and be inserted into the locking groove. The brake section can be pressed tightly against the wheel.

6. The wheelchair brake self-locking device according to claim 1, characterized in that: The rear frame also includes an articulated rod, the brake rod is fixedly connected to one end of the articulated rod, a clamp is fixedly connected to the backrest bracket, and one end of the articulated rod away from the brake rod is articulated to the clamp.

7. The wheelchair brake self-locking device according to claim 6, characterized in that: The rear frame also includes an operating handle, which is in an inverted U-shaped structure and is fixedly connected to the brake lever.

8. The wheelchair brake self-locking device according to claim 1, characterized in that: The locking groove is in a U-shaped structure.

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