Hidden liftable armrest mechanism for wheelchair

Abstract

A hidden liftable armrest mechanism for a wheelchair comprises an armrest, a connecting rod part, a frame and a lock catch mechanism. One end of the handrail is rotationally connected with the frame; the connecting rod part comprises two connecting rods which are rotationally connected, and the two outer ends of the two connecting rods are rotationally connected with the frame and the handrail respectively after the two connecting rods are connected; wherein the frame or the handrail connected with one connecting rod is provided with a placing groove used for containing the connecting rod, and the connecting rod is locked in the placing groove through the lock catch mechanism. According to the utility model, the lock catch mechanism is hidden in the armrest or the imbedding groove on the surface of the frame, and when the armrest is in a folded state, the buckling connecting rod locked with the lock catch mechanism can be hidden and locked in the armrest or on the surface of the frame, so that the potential safety hazard caused by exposure of the lock catch mechanism is avoided; meanwhile, the unlocking key of the locking mechanism is located on the surface of the handrail or the frame and is convenient and controllable, and operation is more convenient compared with the mode that the unlocking key is placed on a connecting rod in the prior art.

Description

Technical Field

[0001] The utility model relates to the field of wheelchairs, in particular to a hidden liftable armrest mechanism for wheelchairs. Background Art

[0002] Wheelchairs are the first choice for daily use and rehabilitation exercises for patients with limited mobility. To facilitate family members to carry patients to the wheelchair, the armrests of the wheelchair are flippable. After the patient is on the wheelchair, the armrests can be flipped down to reset them.

[0003] The armrest flipping in the prior art generally uses the conversion between quadrilaterals and triangles to achieve shape switching. After the armrest is reset, the locking mechanism used to lock the armrest is generally set on a movable connecting rod connected to the armrest, such as the electric wheelchair with movable armrests with patent number CN201621407200.X and the wheelchair armrest flipping fixing mechanism with patent number CN202020478252.6. This locking mechanism has the following shortcomings:

[0004] When the armrest is in the open state, the movable connecting rod with the locking mechanism is exposed and has a large size, which may easily cause safety hazards;

[0005] The locking mechanism is arranged on the movable connecting rod, which makes the operation inconvenient when unlocking.

[0006] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a topic to be studied and solved in the present invention. Utility Model Content

[0007] The utility model aims to provide a hidden liftable armrest mechanism for a wheelchair.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A hidden liftable armrest mechanism for a wheelchair, comprising an armrest, a connecting rod, a frame and a locking mechanism;

[0010] One end of the handrail is rotatably connected to the frame;

[0011] The connecting rod portion includes two connecting rods that are rotatably connected, and the two outer ends of the two connecting rods are rotatably connected to the frame and the handrail respectively;

[0012] The frame or the armrest to which one of the connecting rods is connected is provided with an insertion groove for accommodating the connecting rod, and the connecting rod is locked in the insertion groove by the locking mechanism.

[0013] Preferably, when one of the connecting rods is rotatably connected to the armrest, the insertion groove is arranged on the lower surface of the armrest.

[0014] Preferably, when one of the connecting rods is rotatably connected to the frame, the insertion groove is arranged on the upper surface of the frame.

[0015] Preferably, the locking mechanism comprises a locking hole arranged on one of the connecting rods, an elastic buckling structure arranged in the insertion groove, and an unlocking key arranged on the surface of the frame or the armrest where the insertion groove is located;

[0016] The elastic buckling structure is engaged with the lock hole under the action of elastic force, and is separated from the lock hole under the action of the driving force of the unlocking key.

[0017] Further preferably, when one of the connecting rods is rotatably connected to the armrest, the unlocking key is arranged on the side of the armrest;

[0018] When one of the connecting rods is rotatably connected to the frame, the unlocking key is arranged on the side of the frame.

[0019] Further preferably, the elastic buckling structure includes a lock connecting rod, a lock fixing seat, a lock elastic element and a lock lock head; the insertion groove includes a first groove body and a second groove body, and the two groove bodies are formed by three rib plates spaced apart;

[0020] One of the connecting rods is locked in the second slot body by the locking mechanism;

[0021] The lock connecting rod passes through the first slot body, the head end of which is connected to the unlocking key, and the tail end of which extends into the second slot body and slides with the lock fixing seat;

[0022] The lock buckle elastic element is positioned between the lock buckle fixing seat and the rear slot wall of the second slot body;

[0023] The lock head of the lock buckle is fixedly arranged on the front end surface of the lock buckle elastic element, and is correspondingly engaged with the lock hole of one of the connecting rods.

[0024] More preferably, the lock elastic element adopts a V-shaped spring piece, and the front end surface of the V-shaped spring piece is arranged horizontally with one of the connecting rods.

[0025] More preferably, the front end surface of the lock buckle lock head is set as a spherical surface, and the lock hole is set as a waist-shaped hole.

[0026] More preferably, one of the connecting rods is provided with an escape opening corresponding to the lock hole, the lock buckle fixing seat cooperates with the escape opening, a through hole is provided on the lock buckle fixing seat corresponding to the lock hole, and the lock buckle lock head passes through the through hole and is engaged with the lock hole.

[0027] Further preferably, the lock fixing seat and the second groove body are slidably matched through a slide rail and a slide groove, and the length direction of the slide rail and the slide groove is the driving direction of the unlocking key; a through hole is arranged on the lock fixing seat corresponding to the lock connecting rod, and the tail end of the lock connecting rod passes through the through hole and is connected to a nut, and the front end face of the nut is fitted with the outer edge of the through hole.

[0028] More preferably, a shaft sleeve is sleeved on the outside of the locking link, and the shaft sleeve is axially limited in the first groove body.

[0029] Further preferably, insertion holes are opened on the two groove walls of the first groove body corresponding to the sleeve, and a clamping strip is arranged on the outer wall of the sleeve along its axial direction, and a bayonet is arranged on the edge of the insertion hole corresponding to the clamping strip. The clamping strip enters the first groove body along the bayonet and can rotate in the first groove body, thereby constituting axial limitation of the sleeve and the first groove body.

[0030] The working principle and advantages of this utility model are as follows:

[0031] The utility model hides the locking mechanism in an insertion groove inside the armrest or on the surface of the frame. When the armrest is in a folded state, the buckling connecting rod locked with the locking mechanism can be hidden and locked inside the armrest or on the surface of the frame, thereby avoiding the safety hazard caused by the exposure of the locking mechanism. At the same time, the unlocking key of the locking mechanism is located on the surface of the armrest or the frame and can be controlled at hand, which is more convenient to operate than placing it on the connecting rod in the existing patent technology.

[0032] The utility model utilizes a single elastic element to realize the independent displacement of two units. When unlocking, the unlocking key drives the lock link, the lock fixing seat and the spring piece to perform displacement action; when fastening, only the spring piece moves, and the lock fixing seat moves very little; compared with the existing patented technology in which the entire lock mechanism needs to be displaced regardless of fastening or unlocking, which causes the lock mechanism to be easily stuck and worn, when the armrest of the utility model is fastened, only the local structure is displaced, the damping wear is small, and it is not easy to get stuck when moving.

[0033] The front end surface of the lock head of the lock buckle of the utility model is spherical, and does not need a large inclined surface for guidance. It will not affect the volume and mechanical strength of the lock buckle mechanism due to the addition of an inclined surface as in the existing patented technology, and can eliminate the hidden danger of the buckle point being subjected to force due to the handrail being pulled up. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Attached Figure 1 This is a diagram of the armrest in the buckled state of Example 1 of the utility model;

[0035] Attached Figure 2 This is a diagram of the armrest in the lifted state of Embodiment 1 of the present utility model;

[0036] Attached Figure 3This is a diagram showing the armrest insert in the embodiment 1 of the utility model in the lifted state;

[0037] Attached Figure 4 This is a bottom view of the armrest of Embodiment 1 of the present utility model;

[0038] Attached Figure 5 This is an exploded view of the armrest and the locking mechanism of Example 1 of the utility model;

[0039] Attached Figure 6 This is an exploded view of the armrest embedded component and the locking mechanism of Example 1 of the utility model;

[0040] Attached Figure 7 It is an exploded view of the buckling connecting rod and the locking mechanism of Example 1 of the utility model;

[0041] Attached Figure 8 This is a top view of the handrail of Example 1 of the utility model;

[0042] Attached Fig. 9 For this utility model Figure 8 Sectional view at AA in the middle;

[0043] Attached Fig.10 For this utility model Figure 8 Cross-section at the middle BB;

[0044] Attached Fig.11 This is a side view of the armrest of Embodiment 1 of the present utility model;

[0045] Attached Fig.12 For this utility model Fig.11 Sectional view at CC;

[0046] Attached Fig.13 This is a diagram of the armrest in the buckled state of Example 2 of the utility model;

[0047] Attached Fig.14 This is a diagram of the armrest in the lifted state of Example 2 of the utility model;

[0048] Attached Fig.15 This is a diagram of the armrest in the buckled state of Example 3 of the utility model;

[0049] Attached Fig.16 This is a diagram of the armrest in embodiment 3 of the present utility model when it is lifted up.

[0050] In the above attached figure:

[0051] 1 armrest; 11 armrest inner part; 12 armrest outer foam part;

[0052] 2 frame; 21 backrest; 22 seat portion;

[0053] 3 connecting rod portion; 31 supporting connecting rod; 32 buckling connecting rod; 321 avoidance opening;

[0054] 4 locking mechanism; 41 locking hole; 42 elastic buckling structure; 421 locking connecting rod; 422 locking fixing seat; 4221 through hole; 4222 through hole; 423 locking elastic element; 424 locking head; 425 nut; 426 shaft sleeve; 427 clamping strip; 428 long screw; 43 unlocking key;

[0055] 5 inserting slot; 51 first slot body; 511 inserting hole; 512 bayonet; 52 second slot body;

[0056] 6 slide rails;

[0057] 7 chute;

[0058] 8 Limit screws. DETAILED DESCRIPTION

[0059] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0060] Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0061] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0062] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0063] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0064] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0065] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0066] The terms "front", "back", "up", "down", "left", "right", etc. used in this article are all directional terms. In this case, they are only used to illustrate the positional relationship between the various structures, and are not used to limit the protection plan of this case and the specific direction during actual implementation. Example

[0067] See attached Figure 1-3 A hidden flip-up armrest 1 mechanism for a wheelchair comprises an armrest 1, a connecting rod portion 3, a frame 2 and a locking mechanism 4.

[0068] One end of the armrest 1 is rotatably connected to the frame 2 . In this embodiment, the armrest 1 is hinged to the frame 2 . The armrest 1 includes an armrest inner component 11 and an armrest outer foam component 12 foamed on the outer surface of the armrest inner component 11 .

[0069] The frame 2 includes a backrest portion 21 and a seat portion 22 , and the two portions are distributed in an L shape.

[0070] The connecting rod portion 3 includes two connecting rods that are rotatably connected, and the two outer ends of the two connecting rods are rotatably connected to the frame 2 and the armrest 1 respectively. The frame 2 or the armrest 1 to which one of the connecting rods is connected is provided with an insertion groove 5 for accommodating the connecting rod, and the connecting rod is locked in the insertion groove 5 by the locking mechanism 4.

[0071] In this embodiment, the two connecting rods are respectively a supporting connecting rod 31 and a buckling connecting rod 32, one of the connecting rods is the buckling connecting rod 32, the insertion groove 5 is arranged on the lower surface of the armrest 1, and the buckling connecting rod 32 is locked in the insertion groove 5 by the locking mechanism 4; at this time, one end of the buckling connecting rod 32 is hinged to the armrest 1, and the other end is hinged to one end of the supporting connecting rod 31, and the other end of the supporting connecting rod 31 is hinged to the upper surface of the frame 2; and when the turning angle between the backrest 21 and the seat part 22 of the frame 2 is large and is an arc transition, the other end of the supporting connecting rod 31 can be hinged to the seat part 22, the backrest 21 or the part between the backrest 21 and the seat part 22.

[0072] See attached Figure 4-5 The insertion groove 5 includes a first groove body 51 and a second groove body 52, and the two groove bodies are formed by three rib plates distributed at intervals.

[0073] See attached Figure 4-12 The locking mechanism 4 includes a locking hole 41 arranged on the locking link 32, an elastic locking structure 42 arranged in the insertion groove 5, and an unlocking key 43 arranged on the surface of the frame 2 or the armrest 1 where the insertion groove 5 is located; the elastic locking structure 42 is engaged with the locking hole 41 under the action of elastic force, and is disengaged from the locking hole 41 under the driving force of the unlocking key 43.

[0074] Wherein, the unlocking button 43 is arranged on the side of the armrest 1 .

[0075] The elastic buckling structure 42 includes a locking rod 421 , a locking fixing seat 422 , a locking elastic element 423 and a locking lock head 424 .

[0076] The buckle connecting rod 32 is locked in the second slot 52 by the locking mechanism 4 .

[0077] The lock fixing seat 422 and the second slot body 52 are slidably matched through the slide rail 6 and the slide groove 7, and the length direction of the slide rail 6 and the slide groove 7 is the driving direction of the unlocking key 43; it is ensured that the lock fixing seat 422 is limited in the second slot body 52 and will not fall from the second slot body 52, and the lock fixing seat 422 moves smoothly. A through hole 4221 is set on the lock fixing seat 422 corresponding to the lock connecting rod 421, and a through hole 4222 is set corresponding to the lock hole 41.

[0078] The lock link 421 passes through the first groove body 51, and its head end is fixedly connected to the unlocking key 43 by a screw, and the tail end extends into the second groove body 52 and slides with the through hole 4221 on the lock fixing seat 422. A long screw 428 is threadedly connected through the lock link 421, and the tail end of the long screw 428 passes through the through hole 4221 and is connected with a nut 425. The front end face of the nut 425 fits with the outer edge of the through hole 4221, which can connect the lock link 421 and the lock fixing seat 422 together, while ensuring the sliding of the lock link 421, preventing the lock link 421 from being separated from the through hole 4221, thereby realizing axial limitation of the lock link 421.

[0079] The lock elastic element 423 is positioned between the lock fixing seat 422 and the rear groove wall of the second groove body 52; the lock elastic element 423 adopts a V-shaped spring piece, and the front end face of the V-shaped spring piece is horizontally arranged with the buckle connecting rod 32; the lock lock head 424 is fixedly arranged on the front end face of the lock elastic element 423, and it passes through the through hole 4222 and is correspondingly engaged with the lock hole 41 of the buckle connecting rod 32, and the front end face of the lock lock head 424 is a spherical surface, which is convenient for matching with the lock hole 41; the front end face of the V-shaped spring piece is horizontally arranged with the buckle connecting rod 32, which can ensure that the lock lock head 424 is vertically correspondingly engaged with the lock hole 41, so that the engagement is smooth.

[0080] In order to facilitate the stable engagement of the lock head 424 with the lock hole 41, the buckle connecting rod 32 is provided with an escape opening 321 corresponding to the lock hole 41, and the lock fixing seat 422 cooperates with the escape opening 321; when the buckle connecting rod 32 enters the second groove body 52, the escape opening 321 is engaged with the lock fixing seat 422, and the lock hole 41 on the buckle connecting rod 32 is accurately engaged with the lock head 424. Figure 7 .

[0081] In order to ensure smooth engagement between the lock head 424 and the lock hole 41 and reduce assembly accuracy, the lock hole 41 may be configured as a waist-shaped hole.

[0082] In order to ensure the smooth movement of the lock link 421, a sleeve 426 is sleeved on the outside of the lock link 421, and the sleeve 426 is axially limited in the first slot body 51. Specifically, the sleeve 426 corresponds to the two slot walls of the first slot body 51 and is provided with a plug hole 511. A clamping strip 427 is provided on the outer wall of the sleeve 426 along its axial direction. A bayonet 512 is provided at the edge of the plug hole 511 corresponding to the clamping strip 427. The clamping strip 427 enters the first slot body 51 along the bayonet 512 and can rotate in the first slot body 51, thereby constituting the axial limitation of the sleeve 426 and the first slot body 51. When installing the shaft sleeve 426, the clamping strip 427 can be aligned with the clamping slot 512, and the shaft sleeve 426 can be inserted into the first slot body 51. When the clamping strip 427 is separated from the clamping slot 512, the shaft sleeve 426 is rotated. When the clamping strip 427 rotates until its front and rear ends are in contact with the opposite surfaces of the two ribs of the first slot body 51, the rotation stops. At this time, the shaft sleeve 426 will not move axially, and the two ends of the shaft sleeve 426 are limited in the insertion hole 511, and the shaft sleeve 426 will not fall out of the first slot body 51. The installation of the shaft sleeve 426 is completed. Figure 5-6 .

[0083] When the above-mentioned hidden liftable armrest 1 mechanism is in use, the armrest 1 can be closed or lifted:

[0084] When the armrest 1 is buckled, the armrest 1 drives the two connecting rods to be pressed down, the second groove body 52 gradually cooperates with the buckling connecting rod 32, the buckle fixing seat 422 and the avoidance opening 321 of the buckling connecting rod 32 are gradually engaged, the outer peripheral surface of the locking hole 41 of the buckling connecting rod 32 presses the buckle lock head 424, and the buckle lock head 424 presses the spring piece; when the buckling connecting rod 32 is completely hidden and placed in the second groove body 52, the buckle lock head 424 corresponds to the locking hole 41, and under the elastic force of the spring piece, the buckle lock head 424 will enter the locking hole 41 to realize the locking of the buckling connecting rod 32. At this time, the armrest 1, the supporting connecting rod 31 and the frame 2 form a triangular supporting structure, as shown in FIG. Figure 1 .

[0085] When performing the above-mentioned snapping action, the snapping connecting rod 32 only compresses the lock head 424, so that the lock head 424 compresses the spring piece, and the lock connecting rod 421 and the lock fixing seat 422 are in sliding cooperation, so the movement of the lock head 424 basically has no effect or has little effect on the lock connecting rod 421 and the unlocking key 43; the entire snapping action only involves displacement of the local structure, compared with the existing comparative patent in which the entire lock mechanism 4 is displaced, which easily leads to the lock mechanism 4 being stuck and worn, the present solution is not prone to jamming and wear when moving.

[0086] In addition, compared with the existing comparative patents in which the snap-fitting points need to be guided by a larger inclined surface, the front end surface of the lock lock head 424 in this solution is spherical, and does not require a larger inclined surface to guide. The volume and mechanical strength of the lock mechanism 4 will not be affected by the addition of the inclined surface, and the hidden danger of the snap-fitting point being subjected to force due to the upward pulling of the armrest 1 is eliminated.

[0087] When the armrest 1 is lifted, the unlocking button 43 is pressed at the same time, which can be operated with one hand; after the unlocking button 43 is pressed, the locking link 421 will be driven to press the spring sheet, and the spring sheet is compressed and drives the locking lock head 424 to move backward and disengage from the lock hole 41, at this time, the buckling link 32 is not limited by the locking lock head 424, and after the armrest 1 is pulled up, the buckling link 32 can be disengaged from the second slot 52; release the unlocking button 43, under the elastic force of the spring sheet, the spring sheet drives the locking fixing seat 422 and the locking lock head 424 to reset, and the locking fixing seat 422 drives the locking link 421 and the unlocking button 43 to reset; continue to pull up the armrest 1, the armrest 1 drives the buckling link 32 to continue to pull up, and the buckling link 32 drives the supporting link 31 to unfold, and when the armrest 1 is lifted up, the supporting link 31, the buckling link 32, the frame 2 and the armrest 1 form a quadrilateral supporting structure. Figure 2 .

[0088] In order to ensure that the armrest 1 is in a suspended state after being lifted up, damping can be provided at the hinge key between the armrest 1, the connecting rod and the frame 2 to prevent the armrest 1 from falling down after being lifted up.

[0089] In addition, in order to limit the lifting angle of the armrest 1, a limit screw 8 can be provided on one side of the hinge between the buckle connecting rod 32 and the armrest 1, and the axial direction of the limit screw 8 is the width direction of the second groove 52. In this way, when the armrest 1 is lifted, the buckle connecting rod 32 cannot continue to rotate after rotating to the limit screw 8, thereby limiting the rotation angle of the armrest 1. Figure 3 . Example

[0090] See attached Figure 13-14 This embodiment is basically the same as Embodiment 1, except that:

[0091] The insertion groove 5 is arranged on the upper surface of the backrest 21 of the frame 2. The buckle connecting rod 32 is locked in the insertion groove 5 by the locking mechanism 4; at this time, one end of the buckle connecting rod 32 is hinged to the upper surface of the backrest 21 of the frame 2, and the other end is hinged to one end of the support connecting rod 31, and the other end of the support connecting rod 31 is hinged to the lower surface of the armrest 1.

[0092] The unlocking button 43 is disposed on a side of the backrest portion 21 of the vehicle frame 2 .

[0093] When the armrest 1 is buckled, the armrest 1 drives the supporting link 31 to be pressed down, and the supporting link 31 drives the buckling link 32 to approach the backrest 21 of the frame 2, and gradually hides in the second groove 52 on the upper surface of the backrest 21; when the buckling link 32 is completely placed in the second groove 52, the locking head 424 is buckled with the locking hole 41 to achieve the locking of the buckling link 32. After locking, the armrest 1, the supporting link 31 and the frame 2 form a triangular supporting structure, as shown in FIG. Fig.13 .

[0094] When the armrest 1 is lifted up, the unlocking key 43 is pressed at the same time, and the lock head 424 is disengaged from the lock hole 41. At this time, the buckling link 32 is not limited by the lock head 424. After the armrest 1 is pulled up, the armrest 1 pulls the supporting link 31 upward, and the supporting link 31 pulls the buckling link 32 upward. At this time, the buckling link 32 is disengaged from the second slot 52; the unlocking key 43 is released. At this time, the armrest 1 can be pulled up continuously, and the armrest 1 drives the supporting link 31 and the buckling link 32 to continue to unfold. When the armrest 1 is lifted up, the supporting link 31, the buckling link 32, the frame 2 and the armrest 1 form a quadrilateral support structure. Fig.14 . Example

[0095] See attached Figure 15-16 This embodiment is basically the same as Embodiment 1, except that:

[0096] The insertion groove 5 is arranged on the upper surface of the seat portion 22 of the frame 2. The buckle connecting rod 32 is locked in the insertion groove 5 by the locking mechanism 4; at this time, one end of the buckle connecting rod 32 is hinged to the upper surface of the seat portion 22 of the frame 2, and the other end is hinged to one end of the support connecting rod 31, and the other end of the support connecting rod 31 is hinged to the lower surface of the armrest 1.

[0097] The unlocking button 43 is disposed on a side of the seat portion 22 of the vehicle frame 2 .

[0098] When the armrest 1 is buckled, the armrest 1 drives the supporting link 31 to be pressed down, and the supporting link 31 drives the buckling link 32 to approach the seat portion 22 of the frame 2, and gradually hides in the second groove 52 on the upper surface of the seat portion 22; when the buckling link 32 is completely placed in the second groove 52, the lock lock head 424 is buckled with the lock hole 41 to achieve the locking of the buckling link 32. After locking, the armrest 1, the supporting link 31 and the frame 2 form a quadrilateral support structure, as shown in FIG. Fig.15 .

[0099] When the armrest 1 is lifted up, the unlocking key 43 is pressed at the same time, and the lock head 424 is disengaged from the lock hole 41. At this time, the buckling link 32 is not limited by the lock head 424. After the armrest 1 is pulled up, the armrest 1 pulls the supporting link 31 upward, and the supporting link 31 pulls the buckling link 32 upward. At this time, the buckling link 32 is disengaged from the second slot 52; the unlocking key 43 is released. At this time, the armrest 1 can be pulled up continuously, and the armrest 1 drives the supporting link 31 and the buckling link 32 to continue to unfold. When the armrest 1 is lifted up, the supporting link 31, the buckling link 32, the frame 2 and the armrest 1 form a quadrilateral support structure. Fig.16 .

[0100] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A hidden liftable armrest mechanism for a wheelchair, characterized in that: It includes an armrest, a connecting rod, a frame and a locking mechanism; One end of the handrail is rotatably connected to the frame; The connecting rod portion includes two connecting rods that are rotatably connected, and the two outer ends of the two connecting rods are rotatably connected to the frame and the handrail respectively; The frame or the armrest to which one of the connecting rods is connected is provided with an insertion groove for accommodating the connecting rod, and the connecting rod is locked in the insertion groove by the locking mechanism.

2. A hidden liftable armrest mechanism for a wheelchair according to claim 1, characterized in that: When one of the connecting rods is rotatably connected to the armrest, the insertion groove is arranged on the lower surface of the armrest.

3. The hidden liftable armrest mechanism for a wheelchair according to claim 1, characterized in that: When one of the connecting rods is rotatably connected to the frame, the insertion groove is arranged on the upper surface of the frame.

4. A hidden liftable armrest mechanism for a wheelchair according to claim 2 or 3, characterized in that: The locking mechanism comprises a locking hole arranged on one of the connecting rods, an elastic buckling structure arranged in the insertion groove, and an unlocking key arranged on the surface of the frame or the armrest where the insertion groove is located; The elastic buckling structure is engaged with the lock hole under the action of elastic force, and is separated from the lock hole under the action of the driving force of the unlocking key.

5. The hidden liftable armrest mechanism for a wheelchair according to claim 4, characterized in that: When one of the connecting rods is rotatably connected to the armrest, the unlocking key is arranged on the side of the armrest; When one of the connecting rods is rotatably connected to the frame, the unlocking key is arranged on the side of the frame.

6. The hidden liftable armrest mechanism for a wheelchair according to claim 4, characterized in that: The elastic buckling structure includes a lock connecting rod, a lock fixing seat, a lock elastic element and a lock lock head; the insertion groove includes a first groove body and a second groove body, and the two groove bodies are formed by three rib plates distributed at intervals; One of the connecting rods is locked in the second slot body by the locking mechanism; The lock connecting rod passes through the first slot body, the head end of which is connected to the unlocking key, and the tail end of which extends into the second slot body and slides with the lock fixing seat; The lock buckle elastic element is positioned between the lock buckle fixing seat and the rear slot wall of the second slot body; The lock head of the lock buckle is fixedly arranged on the front end surface of the lock buckle elastic element, and is correspondingly engaged with the lock hole of one of the connecting rods.

7. A hidden liftable armrest mechanism for a wheelchair according to claim 6, characterized in that: The lock buckle elastic element is a V-shaped spring sheet, and the front end surface of the V-shaped spring sheet is arranged horizontally with one of the connecting rods.

8. The hidden liftable armrest mechanism for a wheelchair according to claim 6, characterized in that: The front end surface of the lock head of the lock buckle is set as a spherical surface, and the lock hole is set as a waist-shaped hole.

9. The hidden liftable armrest mechanism for a wheelchair according to claim 6, characterized in that: A clearance opening is arranged at one of the connecting rods corresponding to the lock hole, the lock fixing seat cooperates with the clearance opening, a through hole is arranged on the lock fixing seat corresponding to the lock hole, and the lock head of the lock passes through the through hole and is engaged with the lock hole.

10. The hidden liftable armrest mechanism for a wheelchair according to claim 6, characterized in that: The lock fixing seat and the second groove body are slidably matched through a slide rail and a slide groove, and the length direction of the slide rail and the slide groove is the driving direction of the unlocking key; a through hole is set on the lock fixing seat corresponding to the lock connecting rod, and the tail end of the lock connecting rod passes through the through hole and is connected to a nut, and the front end face of the nut is in contact with the outer edge of the through hole.

11. A hidden liftable armrest mechanism for a wheelchair according to claim 10, characterized in that: A shaft sleeve is sleeved on the outside of the locking link, and the shaft sleeve is axially limited in the first groove body.

12. The hidden liftable armrest mechanism for a wheelchair according to claim 11, characterized in that: Insertion holes are provided on the two groove walls of the first groove body corresponding to the sleeve, and a clamping strip is provided on the outer wall of the sleeve along its axial direction, and a bayonet is provided on the edge of the insertion hole corresponding to the clamping strip. The clamping strip enters the first groove body along the bayonet and can rotate in the first groove body, thereby constituting an axial limit of the sleeve and the first groove body.

Images