Latch for adjustable length lever for wheelchair

Abstract

A sleeve rod formed by connecting an outer rod and an inner rod in a sleeved mode is arranged in a sleeve in a penetrating mode, a plurality of positioning holes A are formed in the outer rod in the length direction, a plurality of positioning holes B are formed in the inner rod in the length direction, and any positioning hole A and any positioning hole B can correspondingly form a butt joint hole. The locking device is characterized by further comprising an active locking assembly and an elastic positioning assembly, a first connecting hole and a second connecting hole are formed in the wall face of the sleeve, the active locking assembly is fixedly connected with one butt joint hole through the first connecting hole, and the elastic positioning assembly is fixedly connected with the other butt joint hole through the second connecting hole. The latch can reliably lock and fix the joint according to the adjustment operation of the length-adjustable rod piece for the wheelchair, the active locking assembly and the elastic positioning assembly generate linkage, the elastic positioning assembly performs positioning firstly, and the active locking assembly performs locking again, so that one-time operation can be realized, the use is quick, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to a locking mechanism, in particular to a locking mechanism for a rod with adjustable length. Background Art

[0002] A wheelchair is a means of transportation for people with mobility impairments. In order to improve the applicability of wheelchairs to users of different heights and body shapes, some components on the wheelchair are configured as adjustable structures. For example, a push tube is connected by two sections of rods, which can change the length of the entire rod by relative movement, forming an adjustable-length rod. However, the connection needs to be locked and fixed after adjustment, and a locking mechanism that can be quickly and easily operated is beneficial for use. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide a latch for an adjustable-length rod for a wheelchair, which can ensure reliable locking and fixation of the connection while being quick and easy to operate.

[0004] Technical solution: A latch for an adjustable length rod for a wheelchair, comprising a sleeve, a sleeve rod formed by a sleeve connection of an outer rod and an inner rod and inserted into the sleeve, a plurality of positioning holes A distributed along the length direction of the outer rod, a plurality of positioning holes B distributed along the length direction of the inner rod, any positioning hole A and any positioning hole B can form a corresponding docking hole, characterized in that: it also includes an active locking component and an elastic positioning component, a first connecting hole and a second connecting hole are provided on the wall surface of the sleeve, the active locking component is connected and fixed to one docking hole through the first connecting hole, and the elastic positioning component is connected and fixed to the other docking hole through the second connecting hole.

[0005] Furthermore, the active locking assembly includes a rotating pressure piece, a positioning pin, a first spring, a pressure block, and a pin shaft. A through hole is opened on the pressure block, the first spring is sleeved on the positioning pin, and the two are together inserted into the through hole. The inner end of the first spring is limited by the inner end of the pressure piece, and the outer end of the first spring is limited by the outer end of the positioning pin. The pressure block is in the first connecting hole, and the inner end of the positioning pin faces a docking hole. The rotating pressure piece and the sleeve are rotatably connected by the pin shaft, and the inner end of the rotating pressure piece is cam-shaped, and the cam shape acts on the outer end of the positioning pin.

[0006] Furthermore, the outer end of the rotating pressing piece is a gripping handle so that the rotating pressing piece can be rotated by grasping this part.

[0007] Furthermore, the elastic positioning assembly includes a guide column, a second spring, and a plunger. The second connecting hole is in a step shape. The diameter of the outer step hole is larger than the diameter of the inner step hole. The outer end of the second spring is fixed to the inner end of the plunger, and the inner end of the second spring is fixed to the outer end of the guide column. The three are together inserted into the second connecting hole. The outer end of the plunger is fastened to the outside of the outer step hole with a thread. The inner end of the second spring is limited by the inner side of the outer step hole, and the inner end of the guide column extends into the inner step hole and faces the other docking hole.

[0008] Furthermore, the inner end of the guide post is an arc-shaped surface, and the inner end of the guide post can smoothly enter or escape from the positioning hole B on the inner rod.

[0009] Furthermore, the sleeve has a clamping structure composed of two clamping plates facing each other at the arrangement position of the active locking component, and the active locking component is located between the two clamping plates. The active locking component can be firmly installed on the sleeve.

[0010] Beneficial effects: The advantages of the utility model are: the latch can be adjusted for the adjustable length rod of the wheelchair, and the connection can be reliably locked and fixed. The active locking component and the elastic positioning component are linked, the elastic positioning component is positioned first, and the active locking component is locked again, and it can be operated once, which is quick and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the utility model in the release position;

[0012] Figure 2 is a schematic diagram of the utility model in a locked position;

[0013] Figure 3 This is one of the schematic diagrams of the structure of the utility model;

[0014] Figure 4 This is the second schematic diagram of the structure of the utility model;

[0015] Figure 5 Schematic diagram of casing structure. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] A latch for an adjustable length rod for a wheelchair, as shown in the attached Figures 1 to 4 As shown, it includes a sleeve 1, an active locking component 2, and an elastic positioning component 3.

[0018] The adjustable length rod is a sleeve rod 4 formed by an outer rod 41 and an inner rod 42 being sleeved and connected. A plurality of positioning holes A43 are provided on the outer rod 41 along the length direction, and a plurality of positioning holes B44 are provided on the inner rod 42 along the length direction. The two adjacent positioning holes A43 and the two adjacent positioning holes B44 are arranged at equal intervals to ensure that any positioning hole A43 and any positioning hole B44 can form a corresponding docking hole. After the outer rod and the inner rod move relative to each other, the sleeve rod after the length is adjusted can be fixed by connecting and fixing at least one docking hole.

[0019] The sleeve rod 4 is inserted into the sleeve tube 1, and a first connecting hole 11 is provided on the wall surface of the sleeve tube 1. The active locking component 2 is connected and fixed to a docking hole on the sleeve rod 4 through the first connecting hole 11. The specific structure is as follows: the active locking component 2 includes a rotating pressing piece 21, a positioning pin 22, a first spring 23, a pressing block 24, and a pin shaft 25; a through hole 241 is provided on the pressing block 24, and the first spring 23 is sleeved on the positioning pin 22, and the two are inserted into the through hole 241 together. The inner end of the first spring 23 is fixed to the inner end of the pressing block 24 to be limited, and the outer end of the first spring 23 is fixed to the outer end of the positioning pin 22 to be limited. Therefore, when the positioning pin translates in the through hole, the first spring 23 is fixed to the outer end of the positioning pin 22. A spring is compressed or rebounded under force; the pressure block 24 is in the first connecting hole 11, and the inner end of the positioning pin 22 faces a docking hole, which can fix the sleeve 1 and the outer rod 41. The initial position ensures that the inner end of the positioning pin 22 faces a positioning hole A43; the rotating pressing piece 21 and the sleeve 1 are rotatably connected by the pin shaft 25, and the inner end of the rotating pressing piece 21 is a cam shape 211, which acts on the outer end of the positioning pin 22, and the outer end of the rotating pressing piece 21 is a holding handle 212.

[0020] Combined with Figure 5 As shown, at the arrangement position of the active locking component 2, two clamping plates 13 are arranged opposite to each other on the sleeve 1 to form a clamping structure. The active locking component 2 is located between the two clamping plates 13, and both ends of the pin 25 are fixed to one clamping plate 13 respectively.

[0021] A second connecting hole 12 is formed on the wall of the sleeve 1 . The second connecting hole 12 is positioned opposite to the first connecting hole 11 . The elastic positioning assembly 3 is connected and fixed to another docking hole on the sleeve rod 4 through the second connecting hole 12 . The specific structure is as follows: the elastic positioning component 3 includes a guide column 31, a second spring 32, and a plunger 33; the second connecting hole 12 is opened in a step shape, and the diameter of the outer step hole 121 is larger than the diameter of the inner step hole 122; the outer end of the second spring 32 is fixed to the inner end of the plunger 33, and the inner end of the second spring 32 is fixed to the outer end of the guide column 31, and the three are together inserted into the second connecting hole 12, the outer end of the plunger 33 is fastened to the outer side of the outer step hole 121 by threads, the inner end of the second spring 32 is limited by abutting against the inner side of the outer step hole 121, the inner end of the guide column 31 extends into the inner step hole 122 and faces the other docking hole, and the inner end of the guide column 31 is an arc surface 311, so when the guide column translates in the inner step hole, the second spring is compressed or rebounds to reset.

[0022] Attached Figure 1 The latch is shown in the release position, the first spring 23 is reset and released, the positioning pin 22 is disengaged from one docking hole 45, and the guide column 31 is still opposite to the other docking hole 46. Under the action of the second spring 32, the guide column 31 extends into the docking hole 46. In the release position, the inner rod 42 can be pulled up and down to adjust the inner rod 42, and the wall surface of the inner rod 42 acts on the inner end of the guide column 31. The guide column 31 is forced to translate outward. When the positioning hole A43 and the positioning hole B44 correspond to form a docking hole again, the guide column 31 is translated inwardly under the action of the second spring 32 and extends into the docking hole here. The inner rod 42 and the outer rod 41 are first positioned, and then the rotating pressing piece 21 is rotated to make the cam shape 211 act on the positioning pin 22. The positioning pin 22 is forced to translate inwardly and extends into the docking hole here. The rotating pressing piece 21 locks the positioning pin 22, and the positioning pin 22 locks the docking hole here. Figure 2 Latch shown in locked position.

[0023] The present application arranges three groups of shock-absorbing structures, namely, a left shock-absorbing structure, a right shock-absorbing structure, and a front shock-absorbing structure, on the main body of the wheelchair frame, which can greatly eliminate the vibration caused by the bumps of the four wheels during the movement of the wheelchair. It has a multi-directional shock-absorbing effect, improves the comfort of wheelchair riding, and brings an excellent user experience to special groups of people.

Claims

1. A latch for an adjustable-length rod for a wheelchair, comprising a sleeve (1), a sleeve rod formed by sleeve-connecting an outer rod and an inner rod and inserted into the sleeve (1), the outer rod having a plurality of positioning holes A distributed along the length direction, the inner rod having a plurality of positioning holes B distributed along the length direction, any positioning hole A and any positioning hole B correspondingly forming a docking hole, characterized in that: It also comprises an active locking component (2) and an elastic positioning component (3); a first connecting hole (11) and a second connecting hole (12) are provided on the wall surface of the sleeve (1); the active locking component (2) is connected and fixed to one docking hole via the first connecting hole (11); and the elastic positioning component (3) is connected and fixed to the other docking hole via the second connecting hole (12).

2. The latch of the adjustable length rod for a wheelchair according to claim 1, characterized in that: The active locking assembly (2) comprises a rotating pressing piece (21), a positioning pin (22), a first spring (23), a pressing block (24), and a pin shaft (25). A through hole (241) is provided on the pressing block (24). The first spring (23) is sleeved on the positioning pin (22). The two are inserted into the through hole (241) together. The inner end of the first spring (23) is limited by the inner end of the pressing block (24). The outer end of the first spring (23) is limited by the outer end of the positioning pin (22). The pressing block (24) is located in the first connecting hole (11). The inner end of the positioning pin (22) faces a docking hole. The rotating pressing piece (21) and the sleeve (1) are rotatably connected by the pin shaft (25). The inner end of the rotating pressing piece (21) is in a cam shape (211). The cam shape (211) acts on the outer end of the positioning pin (22).

3. The latch of the adjustable length rod for a wheelchair according to claim 2, characterized in that: The outer end of the rotating pressing sheet (21) is a gripping handle (212).

4. The latch of the adjustable length rod for a wheelchair according to claim 1, characterized in that: The elastic positioning assembly (3) comprises a guide column (31), a second spring (32), and a plunger (33); the second connecting hole (12) is in a step shape; the diameter of the outer step hole (121) is larger than the diameter of the inner step hole (122); the outer end of the second spring (32) is fixed to the inner end of the plunger (33); the inner end of the second spring (32) is fixed to the outer end of the guide column (31); the three are together inserted into the second connecting hole (12); the outer end of the plunger (33) is screw-fastened to the outer side of the outer step hole (121); the inner end of the second spring (32) is limited by the inner side of the outer step hole (121); the inner end of the guide column (31) extends into the inner step hole (122) and faces the other docking hole.

5. The latch of the adjustable length rod for a wheelchair according to claim 4, characterized in that: The inner end of the guide column (31) is an arc-shaped surface (311).

6. The latch of the adjustable length rod for a wheelchair according to claim 1, characterized in that: The sleeve (1) has a clamping structure formed by two clamping plates (13) facing each other at the location where the active locking component (2) is arranged, and the active locking component (2) is located between the two clamping plates (13).

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