Folding armrest frame with linkage locking mechanism

Abstract

The invention discloses a folding armrest frame with a linkage locking mechanism. The folding armrest frame comprises two symmetrically-arranged rotary joints, a front supporting arm and a rear supporting arm, wherein the front supporting arm and the rear supporting arm are hinged to the rotary joints respectively. The two ends of the movable support are movably connected with the front supporting arm and the rear supporting arm respectively. A fixed support is arranged between the two front supporting arms or between the two rear supporting arms, a locking mechanism is arranged between the fixed support and the movable support, the movable support and the fixed support are connected and fixed by the locking mechanism in a locking state, and the connection between the movable support and the fixed support is released by the locking mechanism in an unlocking state. The movable support can move relative to the front supporting arm and the rear supporting arm. Through linkage of the unique locking mechanisms, a user only needs to operate one locking mechanism, and the locking or unlocking state of the front supporting arm and the rear supporting arm can be controlled at the same time. The tedious process that a user needs to bend down and respectively operate the locks on the two sides in the prior art is thoroughly changed, real single-hand and one-step operation is achieved, user experience is greatly improved, and the lock is particularly suitable for user groups with weak upper limb strength or poor coordination.

Description

TECHNICAL FIELD

[0001] The present application relates to a foldable handrail with a linkage locking mechanism. BACKGROUND

[0002] As a common walking aid and support device, handrails are widely used in medical rehabilitation, elderly care and many other daily life scenarios. In order to facilitate transportation and storage, foldable handrails have become the mainstream products in the market. Traditional foldable handrails usually achieve folding through simple hinge mechanisms, and the folding mode is mostly inward folding of the front and rear support arms.

[0003] However, the existing foldable handrails still have obvious deficiencies in structure and function. First, the folding and unfolding operations of most products are relatively cumbersome, often requiring the user to bend down and simultaneously operate the locking mechanisms on both sides. This is extremely unfriendly to users with limited mobility, insufficient muscle strength or poor coordination, such as the elderly or patients in rehabilitation, and there is a risk of difficulty in operation and even safety hazards.

[0004] Secondly, common locking mechanisms (such as simple latches, buttons or knobs) are usually independently set on the support arms on both sides. The user must unlock or lock the locks on both sides, which cannot achieve single-handed synchronous linkage, resulting in redundant operation steps and low efficiency. More critically, in the unfolded state, if the user accidentally touches or only one side of the lock is completely locked, the handrail may suddenly fold due to single-sided failure during use, causing serious safety accidents. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a foldable handrail with a linkage locking mechanism.

[0006] In order to solve the above-mentioned technical problems, the present application adopts the following technical solutions:

[0007] A foldable handrail with a linkage locking mechanism, comprising: two symmetrical rotary joints, a front support arm and a rear support arm respectively hinged on each rotary joint; an activity support, both ends of which are simultaneously connected with the front support arm and the rear support arm; a fixed support is provided between the two front support arms or between the two rear support arms, and a locking mechanism is provided between the fixed support and the activity support. The locking mechanism connects the fixed activity support and the fixed support in the locked state, and releases the connection between the activity support and the fixed support in the unlocked state, so that the activity support can move relative to the front support arm and the rear support arm.

[0008] Preferably, the locking mechanism comprises a locking knob rotatably mounted on the movable support, the locking knob is provided with a locking slot, the fixed support is fixedly connected with a mounting base, the mounting base is provided with a movable locking pin assembly; by rotating the locking knob, when the locking pin assembly is clamped into the locking slot, the movable support and the fixed support are relatively locked; when the locking pin assembly is separated from the locking slot, the movable support can move relative to the fixed support.

[0009] Preferably, the locking pin assembly comprises a guide slot formed in the mounting base, the guide slot is provided with an axially movable locking pin, and the locking pin and the bottom of the guide slot are provided with a return spring.

[0010] Preferably, both ends of the movable support are rotatably connected with rotating swing arms, the front support arm is fixedly provided with a mounting shaft seat for rotatably cooperating with the movable support, and the other end of the rotating swing arm is rotatably connected with the rear support arm.

[0011] Preferably, the rotating joint comprises a horizontal rotating shaft, a front support arm and a rear support arm pivoted to both ends of the rotating shaft, and a handle rotatably connected to the middle of the rotating shaft, the center of gravity of the handle is located outside the center line of the rotating shaft and is provided with a limiting hole, the front support arm or the rear support arm is provided with an axially slidable stop component, when the front support arm or the rear support arm rotates relative to the rotating shaft, the axial displacement of the stop component removes the constraint on the limiting hole, and the handle automatically rotates downward around the rotating shaft to a folded state under the action of gravity.

[0012] Preferably, the stop component comprises a linkage movably arranged in the front support arm or the rear support arm, the linkage is provided with a guide slope, when the front support arm or the rear support arm rotates around the rotating shaft, the inner wall of the support arm interacts with the guide slope to push the linkage out of the limiting hole, and the handle freely rotates under the action of gravity.

[0013] Preferably, the linkage comprises a rotating table movably arranged on the rotating shaft, the rotating table is provided with a limiting pin and a fixed block with a guide slope, when the front support arm or the rear support arm rotates around the rotating shaft, the inner wall of the support arm interacts with the guide slope to drive the fixed block to move the limiting pin, so that the limiting pin is separated from the limiting hole.

[0014] Preferably, the rotating table is provided with a guide rod on the side away from the limiting pin, the handle is provided with a guide hole for sliding cooperation with the guide rod, when the handle rotates relative to the rotating shaft, the guide rod slides along the guide hole to limit the rotation track of the handle.

[0015] Preferably, both ends of the rotating shaft are respectively and detachably provided with decorative covers.

[0016] Preferably, a first spring is arranged around the rotation shaft between the rear support arm and the rotating table, one end of the first spring is connected to the rear support arm, and the other end is connected to the rotating table.

[0017] The beneficial effects of the present application are:

[0018] The present application can control the locking or unlocking state of the front support arm and the rear support arm at the same time by operating one locking mechanism through the unique linkage of the locking mechanism, which completely changes the cumbersome process of bending down and operating the two locks respectively in the past, realizes the one-handed and one-step operation in the true sense, greatly improves the user experience, and is particularly suitable for the user group with weak upper limb strength or poor coordination. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0020] Figure 1 Structure diagram of the front support arm, the rear support arm and the rotating joint of the present application Figure 1 ;

[0021] Figure 2 Structure diagram of the front support arm, the rear support arm and the rotating joint of the present application Figure 2 ;

[0022] Figure 3 Structure diagram of the front support arm, the rear support arm and the rotating joint of the present application Figure 3 ;

[0023] Figure 4 Structure diagram of the front support arm, the rear support arm and the rotating joint of the present application Figure 4 ;

[0024] Figure 5 Structure diagram of the front support arm, the rear support arm and the rotating joint of the present application Figure 5 ;

[0025] Figure 6 Structure diagram of the rotating table, the limiting pin and the guide inclined surface of the present application

[0026] Figure 7 Structure diagram of a folding handrail frame with a linkage locking mechanism of the present application Figure 1 ;

[0027] Figure 8 Structure diagram of a folding handrail frame with a linkage locking mechanism of the present application Figure 2 ;

[0028] Figure 9Structure diagram of a folding handrail frame with linkage locking mechanism Figure 3 ;

[0029] Figure 10 Folding diagram of a folding handrail frame with linkage locking mechanism. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like reference numerals indicate like elements or elements having the same or similar function throughout the drawings.

[0031] The orientation shown in the drawings should not be understood as limiting the specific protection scope of the present application, but only for the reference understanding of the preferred embodiments, and the position of the product components shown in the drawings can be changed or the number can be increased or the structure can be simplified.

[0032] The "connection" described in the specification and the "connection" relationship of the components shown in the drawings can be understood as fixedly connected or detachably connected or integrally connected; it can be directly connected or connected through an intermediate medium, and those skilled in the art can understand the connection relationship according to the specific circumstances and can derive that the connection is replaced by screwing or riveting or soldering or clamping or embedding in an appropriate manner.

[0033] The orientation words such as up, down, left, right, top, bottom and the like described in the specification and shown in the drawings can be directly contacted or contacted through other features between them; for example, above can be directly above and obliquely above, or it only means higher than others; other orientations can be similarly understood.

[0034] The manufacturing materials of the components with solid shapes represented in the specification and the drawings can adopt metal materials or non-metal materials or other synthetic materials; the machining processes adopted by the components with solid shapes can be stamping, forging, casting, wire cutting, laser cutting, injection molding, numerical milling, three-dimensional printing, machining and the like; those skilled in the art can adaptively select or combine selection according to different processing conditions, cost and precision, but are not limited to the above materials and manufacturing processes.

[0035] The working principle of the present application is:

[0036] For example, Figures 7-9As shown, the folding handrail frame with linkage locking mechanism of the application comprises two symmetrical rotary joints 1, a front support arm 2 and a rear support arm 3 hingedly connected to each rotary joint 1 respectively, a movable support 4, the two ends of which are simultaneously movably connected to the front support arm 2 and the rear support arm 3 respectively, and a fixed support 6 arranged between the two front support arms 2 or the two rear support arms 3, wherein a locking mechanism is arranged between the movable support 4 and the fixed support 6, the locking mechanism connects the movable support 4 and the fixed support 6 in the locked state, and disconnects the movable support 4 and the fixed support 6 in the unlocked state, so that the movable support 4 can move relative to the front support arm 2 and the rear support arm 3. As an embodiment 1, the fixed support 6 is connected between the two rear support arms 3 to illustrate the design concept of the application, the locking mechanism comprises a locking rotary seat 5 rotatably arranged on the movable support 4, a locking clamping groove 51 is formed in the locking rotary seat 5, an installation base block 7 is fixedly connected to the fixed support 6, and a movable locking pin assembly is arranged on the installation base block 7. By rotating the locking rotary seat 5, when the locking pin assembly is clamped into the locking clamping groove 51, the movable support 4 and the fixed support 6 are relatively locked. When the locking pin assembly is separated from the locking clamping groove 51, the movable support 4 can move relative to the fixed support 6. In the locked state, one end of the locking pin assembly is clamped into the locking clamping groove 51, at this time, the movable support 4 and the fixed support 6 are in a relatively locked state. When unlocking is needed, i.e. the locking rotary seat 5 is rotated, the locking rotary seat 5 rotates around the movable support 4, driving the locking clamping groove 51 to move away from the locking pin assembly. At this time, the movable support 4 can rotate relative to the fixed support 6, and the two ends of the movable support 4 are movably arranged on the front support arm 2 and the rear support arm 3 respectively, so the movable support 4 can be folded and rotated along the front support arm 2 and the rear support arm 3. As an embodiment 1, the locking pin assembly comprises a guide groove 81 formed in the installation base block 7, an axially movable locking pin 82 is arranged in the guide groove 81, and a return spring 83 is arranged between the locking pin 82 and the groove bottom of the guide groove 81. The locking rotary seat 5 is rotated to make the locking pin 82 abut tightly in the locking clamping groove 51, and the return spring 83 arranged between the locking pin 82 and the guide groove 81 can better drive the locking pin 82 to abut tightly in the locking clamping groove 51.

[0037] On the basis of the above technical solutions, the connection and cooperation mode of the movable support 4 is that a rotary swing arm 9 is rotatably arranged on the movable support 4, one end of the rotary swing arm 9 is rotatably arranged on the rear support arm 3, and the other end of the rotary swing arm 9 is rotatably arranged on the installation shaft seat 10 of the front support arm 2. As a preferred solution, the two ends of the movable support 4 are respectively provided with rotary swing arms 9, and the two ends of the movable support 4 are rotatably connected to the front support arm 2.

[0038] On the basis of the above technical solutions, the rotating joint 1 of the present application is also technically optimized, including a horizontally arranged rotating shaft 102, a front supporting arm 2 and a rear supporting arm 3 pivotally connected to both ends of the rotating shaft 102, and a handle 202 rotationally connected to the middle part of the rotating shaft 102, wherein the center of gravity of the handle 202 is located outside the center line of the rotating shaft 102 and is provided with a limiting hole 202a, and the front supporting arm 2 or the rear supporting arm 3 is provided with an axially slidable stop component, and the present application takes the front supporting arm 2 relative to the rotating shaft 102 as an example, and the handle 202 is automatically rotated downward around the rotating shaft 102 to a folded state under the action of gravity by the axial displacement of the stop component to release the constraint on the limiting hole 202a.

[0039] On the basis of the above technical solutions, the stop component includes a linkage 201 movably arranged on the front supporting arm 2, and a guide slope 201a is arranged on the linkage 201, for example, when the front supporting arm 2 rotates around the rotating shaft 102, the inner wall of the front supporting arm 2 interacts with the guide slope 201a to push the linkage 201 to disengage from the limiting hole 202a, and the handle 202 is free to rotate under the action of gravity.

[0040] On the basis of the above technical solutions, the linkage 201 includes a rotating table 401 movably arranged on the rotating shaft 102, and a limiting pin 302 and a fixed block 303 with the guide slope 201a are arranged on the rotating table 401, for example, when the front supporting arm 2 rotates around the rotating shaft 102, the inner wall of the front supporting arm 2 interacts with the guide slope 201a to drive the fixed block 303 to move the limiting pin 302, so that the limiting pin 302 disengages from the limiting hole 202a.

[0041] In order to further optimize the rotating track and stability of the handle 202, a guide rod 402 is arranged on the side of the rotating table 401 away from the limiting pin 302, and a guide hole 202b is formed in the handle 202 to slidably cooperate with the guide rod 402. When the front supporting arm 2 pushes the linkage 201 to move axially, the limiting pin 302 disengages from the limiting hole 202a at the same time, and the first spring 203 is compressed and deformed, the guide rod 402 connected to the rotating table 401 moves forward in the guide hole 202b, and the abutting effect of the handle 202 is released (when the limiting pin 302 is inserted into the limiting hole 202a, the guide rod 402 connected to the rotating table 401 abuts on the handle 202). When the handle 202 rotates relative to the rotating shaft 102, the guide rod 402 slides along the guide hole 202b, plays a limiting and guiding role, makes the handle 202 rotate according to a predetermined track, and avoids shaking or jamming phenomenon in the folding process. Moreover, the guide rod 402 adopts a concave structure, which enhances the cooperation stability with the guide hole 202b.

[0042] On the basis of the above technical scheme, the two ends of the rotating shaft 102 are respectively detachably provided with decorative covers 501, which not only play an aesthetic role, but also protect the ends of the rotating shaft 102, prevent dust or sundries from entering, and prolong the service life of the rotating shaft 102.

[0043] On the basis of the above technical scheme, a first spring 203 is wound on the rotating shaft 102 between the rear support arm 3 and the rotating table 401, one end of the first spring 203 is connected to the rear support arm 3, and the other end is connected to the rotating table 401; the first spring 203 is provided to enable the rotating table 401 to achieve a reset effect.

[0044] In actual application, when it is necessary to fold the handrail frame, the operator rotates the locking rotary seat 5, the locking clamping groove 51 of the locking rotary seat 5 is separated from the locking pin assembly, and the movable support 4 can move relative to the fixed support 6, since the two ends of the movable support 4 are respectively movably connected to the front support arm 2 and the rear support arm 3, when the operator lifts the connecting support 4 upward, the front support arm 2 and the rear support arm 3 can be driven to rotate relative to the rotating joint, taking the axially slidable stop assembly provided on the front support arm 2 as an example, at this time, the front support arm 2 rotates relative to the rotating shaft 102, the inner wall of the front support arm 2 exerts pressure on the guide inclined surface 201a of the linkage 201, pushes the linkage 201 to move axially, so that the limiting pin 302 is separated from the limiting hole 202a, and the handle 202 can be automatically folded downward under the action of gravity, realizing quick and convenient folding operation. When it is necessary to unfold the handrail frame, the front support arm 2 is rotated in the opposite direction, at this time, the front support arm 2 moves along the rotating shaft 102 away from the rear support arm 3, the first spring 203 restores deformation, drives the rotating table 401 to reset, and then the limiting pin 302 is inserted into the limiting hole 202a, at this time, the relative position between the movable support 4 and the fixed support 6 is adjusted, the locking rotary seat 5 is rotated, so that one end of the locking pin assembly is clamped into the locking clamping groove 51, and then the fixed support 6 and the movable support 4 remain in a relative locking state.

[0045] The present application realizes the true one-handed and one-step operation through the unique linkage of the locking mechanism, which completely changes the cumbersome process of needing the user to bend down and operate the two locking mechanisms respectively, greatly improves the user experience, and is particularly suitable for the user groups with weak upper limb strength or poor coordination.

[0046] Although the present application has been described in detail with reference to the above embodiments, it is apparent to those skilled in the art that various changes or modifications can be made to the present application without departing from the principles and spirit of the application as defined in the claims. Therefore, the detailed description of the disclosed embodiments is merely intended to explain the present application, and is not intended to limit the scope of protection of the present application, which is defined by the content of the claims.

Claims

1. A folding handrail frame with a linkage locking mechanism, characterized in that, It includes: two symmetrically arranged rotary joints (1), a front support arm (2) and a rear support arm (3) respectively hinged to each rotary joint (1); a movable bracket (4), whose two ends are simultaneously movably connected to the front support arm (2) and the rear support arm (3); a fixed bracket (6) is provided between the two front support arms (2) or between the two rear support arms (3), and a locking mechanism is provided between the fixed bracket (6) and the movable bracket (4). When the locking mechanism is locked, it connects the fixed movable bracket (4) and the fixed bracket (6). When the mechanism is unlocked, it releases the connection between the movable bracket (4) and the fixed bracket (6) so that the movable bracket (4) can move relative to the front support arm (2) and the rear support arm (3).

2. A folding handrail frame with a linkage locking mechanism according to claim 1, characterized in that, The locking mechanism includes a locking knob (5) rotatably mounted on the movable bracket (4), the locking knob (5) having a locking slot (51), and a mounting base (7) fixedly connected to the fixed bracket (6), the mounting base (7) having a movable locking pin assembly; by rotating the locking knob (5), when the locking pin assembly is engaged in the locking slot (51), the movable bracket (4) and the fixed bracket (6) remain relatively locked; when the locking pin assembly disengages from the locking slot (51), the movable bracket (4) can move relative to the fixed bracket (6).

3. A folding handrail frame with a linkage locking mechanism according to claim 2, characterized in that, The locking pin assembly includes a guide groove (81) formed on the mounting base (7), a locking pin (82) that can move axially is provided in the guide groove (81), and a return spring (83) is provided between the locking pin (82) and the bottom of the guide groove (81).

4. A folding handrail frame with a linkage locking mechanism according to claim 2, characterized in that, The movable bracket (4) is rotatably connected to two ends of a rotating swing arm (9). The front support arm (2) is fixedly provided with a mounting shaft seat (10) for the movable bracket (4) to rotate and cooperate. The other end of the rotating swing arm (9) is rotatably connected to the rear support arm (3).

5. A folding handrail frame with a linkage locking mechanism according to claim 2, characterized in that, The rotating joint (1) includes a horizontally arranged rotating shaft (102), a front support arm (2) and a rear support arm (3) pivotally connected to both ends of the rotating shaft (102), and a handle (202) rotatably connected to the middle of the rotating shaft (102). The center of gravity of the handle (202) is located outside the center line of the rotating shaft (102) and is provided with a limiting hole (202a). The front support arm (2) or the rear support arm (3) is provided with a stop assembly that can slide axially. When the front support arm (2) or the rear support arm (3) rotates relative to the rotating shaft (102), the constraint on the limiting hole (202a) is released by the axial displacement of the stop assembly. Under the action of gravity, the handle (202) automatically rotates downward around the rotating shaft (102) to a folded state.

6. A folding handrail frame with a linkage locking mechanism according to claim 5, characterized in that, The stop assembly includes a linkage (201) movably disposed in the front support arm (2) or the rear support arm (3). The linkage (201) is provided with a guide slope (201a). When the front support arm (2) or the rear support arm (3) rotates around the pivot (102), the inner wall of the support arm interacts with the guide slope (201a) to push the linkage (201) out of the limiting hole (202a). The handle (202) rotates freely under the action of gravity.

7. A folding handrail frame with a linkage locking mechanism according to claim 6, characterized in that, The linkage (201) includes a rotating platform (401) movably mounted on the rotating shaft (102). The rotating platform (401) is provided with a limiting pin (302) and a fixing block (303) with a guide slope (201a). When the front support arm (2) or the rear support arm (3) rotates around the rotating shaft (102), the inner wall of the support arm interacts with the guide slope (201a) to drive the fixing block (303) to move the limiting pin (302), so that the limiting pin (302) disengages from the limiting hole (202a).

8. A folding handrail frame with a linkage locking mechanism according to claim 7, characterized in that, The rotary table (401) has a guide rod (402) on the side away from the limiting pin (302). The handle (202) has a guide opening (202b) that slides with the guide rod (402). When the handle (202) rotates relative to the rotating shaft (102), the guide rod (402) slides along the guide opening (202b) to limit the rotation trajectory of the handle (202).

9. A folding handrail frame with a linkage locking mechanism according to claim 5, characterized in that, Decorative covers (501) are detachably provided at both ends of the rotating shaft (102).

10. A folding handrail frame with a linkage locking mechanism according to claim 5, characterized in that, A first spring (203) is wound around a pivot (102) between the rear support arm (3) and the rotary table (401). One end of the first spring (203) is connected to the rear support arm (3), and the other end is connected to the rotary table (401).

Images