Armrest locking mechanism and wheelchair

Abstract

The utility model discloses an armrest locking mechanism, which is characterized in that an armrest capable of telescopically adjusting the position is inserted on a framework, the framework is also provided with a locking mechanism for implementing locking after the armrest is telescopically adjusted, and the armrest is also provided with a plurality of lock holes for fixing gears. The locking mechanism is embedded in the framework, unlocking is carried out through an elastic pressing type structure, so that the handrail is in an adjustable state, and when the handrail is adjusted to the next gear position, automatic locking is carried out, and locking is carried out. According to the armrest locking mechanism and the wheelchair, the whole locking mechanism is arranged in a wheelchair framework, unlocking operation is implemented in a pressing mode, a lock pin is integrated in a framework space so that a product can be more attractive, a transitional structure is arranged between an armrest rod and the wheelchair framework, sliding resistance is reduced, and the adjusting precision of an armrest is improved.

Description

Technical Field

[0001] The utility model relates to the field of wheelchairs, in particular to an armrest locking mechanism and a wheelchair. Background Art

[0002] China Utility Model Patent Publication No. CN201912345U discloses a wheelchair with adjustable armrest height, wherein a fixed seat is fixedly connected to the armrest rod, and the armrest assembly includes a handle portion for the user to hold and a connecting portion extending in a direction substantially perpendicular to the handle portion, the connecting portion can be slidably inserted into the fixing seat, and a plurality of positioning holes are distributed on the connecting portion along the vertical direction, a locking pin is connected to the fixing seat, and the locking pin has two working positions, when the locking pin is in the first working position, the locking pin passes through the fixing seat and is inserted into the positioning hole of the connecting portion, and the armrest assembly is relatively fixed to the armrest rod; when the locking pin is in the second working position, the locking pin is disengaged from the positioning hole, and the connecting portion is slidably connected to the fixing seat. The locking pin extends outward from the surface of the wheelchair, and the locking pin needs to be pulled outward when unlocking, which is inconvenient and unsightly. Utility Model Content

[0003] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0004] An armrest locking mechanism, a telescopically adjustable armrest is inserted on a frame, the frame is also provided with a locking mechanism for locking the armrest after telescopic adjustment, the armrest is also provided with a plurality of lock holes used as fixed gears, the locking mechanism is embedded in the frame and unlocks the armrest through an elastic press-type structure so that the armrest is in an adjustable state, and automatically locks when the armrest is adjusted to the next gear position.

[0005] In a preferred embodiment of the present invention, the locking mechanism comprises a lock bracket slidably mounted on the frame, and a lock latch is disposed on a side of the lock bracket facing the armrest, which is locked / unlocked through the lock hole as the lock bracket slides.

[0006] In a preferred embodiment of the present invention, an elastic component is further provided between the lock bracket and the frame, and the elastic component provides an elastic restoring force for the lock bracket after the lock latch is unlocked.

[0007] In a preferred embodiment of the utility model, the lock bracket includes an outer buckle plate and a lock plate located on both sides of the frame and connected to each other, at least one pair of through holes is opened on the frame, and the outer buckle plate is connected to the lock plate through the protruding parts extending toward the lock plate at both ends thereof through the through holes.

[0008] In a preferred embodiment of the present invention, the outer buckle plate is further provided with a pressing portion for pressing to unlock, and the protruding portion is arranged with the pressing portion as the center.

[0009] In a preferred embodiment of the utility model, a circumferentially expanding step is provided at the root of the protruding portion, a corresponding connecting hole is opened on the skeleton, the through hole is provided at the bottom of the connecting hole, and the elastic component is placed in a second accommodating space between the outer wall of the protruding portion and the connecting hole and is clamped by the step and the bottom.

[0010] In a preferred embodiment of the present invention, the elastic component is a coil spring.

[0011] In a preferred embodiment of the present invention, an engagement sleeve for reducing friction is further provided between the frame and the handrail rod of the handrail, and the lock bolt passes through the engagement sleeve to engage with the lock hole.

[0012] In a preferred embodiment of the present utility model, rolling bodies are further arranged in the accommodating grooves between the inner wall of the coupling sleeve and the two ends of the handrail rod.

[0013] A wheelchair comprises the above-mentioned armrest locking mechanism.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides an armrest locking mechanism and a wheelchair. The entire locking mechanism is arranged inside the wheelchair frame and the unlocking operation is implemented by pressing. On the one hand, the locking pin is integrated in the frame space to make the product more beautiful. On the third hand, a transition structure is arranged between the armrest rod and the wheelchair frame to reduce sliding resistance and improve the adjustment accuracy of the armrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 The utility model is an overall schematic diagram of a wheelchair with adjustable armrests.

[0018] Figure 2 It is an exploded view of the locking mechanism.

[0019] Figure 3 It is a cross-sectional view of the frame, handrails and connecting sleeves.

[0020] Figure 4 It is a cross-sectional view of the frame, armrest, coupling sleeve and locking mechanism. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings. The above description is simplified for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0022] In the specification, when an element is referred to as being “on,” “fixed” to, “connected to,” “engaged to,” or the like, the element may be directly on, fixed to, connected to, engaged to, or contacting the other element, or intervening elements may be present.

[0023] It is to be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, a first element may be referred to as a second element without departing from the teachings of the present application.

[0024] The following will describe exemplary embodiments of the present application with reference to the accompanying drawings. However, it should be understood that the present application can be presented in a variety of different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all drawings, the same reference numerals represent the same or functionally identical elements.

[0025] Figure 1 A wheelchair is shown, in which an adjustable armrest 100 is inserted into a wheelchair frame 200 and is locked and fixed by a locking mechanism 300 arranged on the frame 200.

[0026] Figures 2 to 4 The structure and locking method of the locking mechanism are shown. The locking mechanism 300 is mainly composed of an outer buckle plate 320 and a lock plate 330 respectively arranged on both sides of the frame 200 and connected to each other. A latch 350 extending toward the armrest 100 is arranged on the lock plate 330. The outer buckle plate 320 is slidable relative to the frame 200. When the outer buckle plate 320 moves toward the armrest 100, the latch 350 is disengaged from the lock hole 111 of the armrest 100 to unlock the armrest, and vice versa, the latch 350 is inserted into the lock hole 111 to lock the armrest.

[0027] Specifically, the outer buckle plate 320 is connected to the lock plate 330 through a pair of protrusions 322 extending toward the lock plate 330. A pair of through holes 212 corresponding to the protrusions 322 are provided on the frame 200, and the protrusions 322 pass through the through holes 212 to connect with the lock plate 330. This connection mode enables the outer buckle plate 320 to drive the lock plate 330 to move synchronously and parallel to each other when the outer buckle plate 320 moves, so that the latch 350 can stably escape from the lock hole 111. A pressing portion 323 is provided on the outer side of the outer buckle plate 320 for the wheelchair user to operate and unlock. The protrusions 322 are arranged around the pressing portion 323 with the pressing portion 323 as the center, and the latch 350 is on the same axis with the pressing portion 323, so that the operation is labor-saving and the unlocking is smooth.

[0028] Furthermore, a pair of connecting holes 210 are provided on the frame 200, and a through hole 212 is provided on the bottom 211 of the connecting hole 210, so that the protruding portion 322 first penetrates the connecting hole 210 and then passes through the through hole 212 to the other side of the frame 200. An elastic component 360 is provided in the first accommodation space between the outer wall of the protruding portion 322 and the connecting hole 210, so that the outer buckle plate 320 is always subjected to an elastic restoring force tending to move away from the armrest 100, and this elastic restoring force enables the latch 350 to be automatically locked in the unlocked state. In addition, an axially expanded step 321 is provided at the root of the protruding portion 322. The outer diameter of the step 321 is slightly smaller than the inner diameter of the connecting hole 210 so that the step 321 can just enter the connecting hole 210. The two ends of the elastic component 360 are tightened by the step 321 and the bottom 211 respectively, thereby preventing the elastic component 360 from interfering with the inner wall of the connecting hole 210 during the sliding of the outer buckle plate 320.

[0029] It is understandable that the outer buckle plate 320 and the lock plate 330 can be fastened by the fixing pin 340 or can be set as an integral structure. The elastic component 360 can be a coil spring wound around the outer wall of the protruding portion 322.

[0030] In one embodiment of the present invention, the handrail rod 110 is inserted into a slot 200 provided on the frame 200, and a locking mechanism 300 is provided through the slot 200. Due to the size difference between the handrail 100 and the slot 200, a coupling sleeve 310 is provided between the two to compensate for the difference so that the two sides can be assembled together more easily or an intermediate piece for easy sliding is provided between them.

[0031] Specifically, the coupling sleeve 310 surrounds the outer periphery of the handrail rod 110, and a lock through hole 312 is provided at the rear side of the coupling sleeve 310 for the latch 350 to penetrate and lock with the lock hole 11. A cylindrical receiving groove 311 is left between the two ends of the handrail rod 110 and the inner wall of the coupling sleeve 310. When the occupant operates the handrail 100 to extend or retract, there will be a certain angle between the pulling-out force and the axis of the handrail rod 110, and the cross section of the handrail rod 110 is flat, so the pulling-out force tends to be biased toward the two ends of the handrail rod 110. Therefore, adding rolling elements such as balls in the receiving groove 311 can reduce the friction between the handrail rod 110 and the coupling sleeve 310, so that the adjustment of the handrail 100 is smoother and the adjustment accuracy is improved.

Claims

1. An armrest locking mechanism, wherein an armrest with a telescopically adjustable position is inserted on a frame, the frame is also provided with a locking mechanism for locking the armrest after the armrest is telescopically adjusted, and the armrest is also provided with a plurality of lock holes used as fixed gears, characterized in that: The locking mechanism is embedded in the frame and unlocks the armrest through an elastic pressing structure so that the armrest is in an adjustable state. When the armrest is adjusted to the next position, it automatically locks.

2. An armrest locking mechanism according to claim 1, characterized in that: The locking mechanism comprises a lock bracket slidably arranged on the frame, and a lock bolt is arranged on a side of the lock bracket facing the armrest, which is locked / unlocked through the lock hole as the lock bracket slides.

3. An armrest locking mechanism as claimed in claim 2, characterized in that: An elastic component is also provided between the lock bracket and the frame, and the elastic component provides an elastic restoring force for the lock bracket after the lock latch is unlocked.

4. An armrest locking mechanism as claimed in claim 3, characterized in that: The lock bracket includes an outer buckle plate and a lock plate located on both sides of the frame and connected to each other. At least one pair of through holes is opened on the frame. The outer buckle plate is connected to the lock plate through the protruding parts extending toward the lock plate at both ends through the through holes.

5. An armrest locking mechanism as claimed in claim 4, characterized in that: The outer buckle plate is also provided with a pressing portion for pressing to unlock, and the protruding portion is arranged with the pressing portion as the center.

6. An armrest locking mechanism as claimed in claim 4, characterized in that: A circumferentially expanding step is provided at the root of the protruding portion, a corresponding connecting hole is opened on the frame, the through hole is provided at the bottom of the connecting hole, and the elastic component is placed in a second accommodating space between the outer wall of the protruding portion and the connecting hole and is clamped by the step and the bottom.

7. An armrest locking mechanism as claimed in claim 6, characterized in that: The elastic component is a coil spring.

8. An armrest locking mechanism as claimed in claim 2 or 3, characterized in that: An engaging sleeve for reducing friction is also provided between the frame and the handrail rod of the handrail, and the lock bolt passes through the engaging sleeve and engages with the lock hole.

9. An armrest locking mechanism as claimed in claim 8, characterized in that: Rolling bodies are also arranged in the accommodating grooves between the inner wall of the coupling sleeve and the two ends of the handrail rod.

10. A wheelchair, characterized in that An armrest locking mechanism comprising any one of claims 1 to 9.

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