Lifting adjusting device of chair armrest

Abstract

The utility model discloses a lifting adjusting device of a chair armrest, which comprises a hand support, a lifting adjusting gear device, an outer vertical pipe, an inner vertical pipe and a pull buckle, the bottom of the hand support is fixedly connected with the top of the outer vertical pipe, the inner vertical pipe is inserted into the outer vertical pipe from the bottom of the outer vertical pipe, the inner vertical pipe is inserted into the outer vertical pipe in a penetrating mode, a lifting adjusting gear device is arranged between the bottom of the hand support and the inner wall of the inner vertical pipe, the top of the lifting adjusting gear device is fixedly connected with a pull buckle, and the outer section of the pull buckle extends out. And locking and unlocking of the lifting gear adjusting device are controlled by externally operating the pulling buckle. According to the product, the lifting adjusting gear device is hidden in the outer vertical pipe and the inner vertical pipe, one side of the top of the lifting adjusting gear device is fixedly connected with the pulling buckle which extends out, the pulling buckle can be conveniently and easily touched by a human hand and operated, and the lifting adjusting gear device can be unlocked by slightly pulling the lifting adjusting gear device upwards by a single hand during operation; and then the lifting adjustment of the hand support and the synchronous lifting of the outer vertical pipe can be realized by lifting or pressing the hand support.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wheelchair component, especially a lifting adjusting device of a chair armrest. BACKGROUND

[0002] 1. Chinese patent document publication number: CN208756359U discloses an electric wheelchair armrest lifting adjusting device, comprising a vertically arranged armrest mounting pipe with an upper opening, a threaded hole penetrating the pipe wall is formed on the armrest mounting pipe, two symmetrically arranged slot holes are formed on the upper and lower sides of the threaded hole; a bushing is connected to the upper end of the armrest mounting pipe, the lower end of the bushing extends into the armrest mounting pipe, a suspension elastic sheet is connected to the bushing inside the armrest mounting pipe; a armrest adjusting pipe extends into the bushing; a U-shaped adjusting block is arranged outside the armrest mounting pipe, the two free ends of the adjusting block extend into the two slot holes respectively, a through hole is formed in the bottom of the adjusting block; an eccentric wrench is arranged outside the adjusting block, the eccentric wrench comprises an eccentric ball head and a wrench, a screw rod is connected to the outer end of the eccentric ball head, the free end of the screw rod penetrates the through hole of the adjusting block and is threadedly connected in the threaded hole of the armrest mounting pipe. A gasket is arranged between the adjusting block and the eccentric ball head of the eccentric wrench, the surface of the gasket facing the eccentric ball head is provided with a curved surface matched with the eccentric ball head, the surface of the gasket facing the adjusting block is provided with a flat surface matched with the adjusting block, a through hole for penetrating the screw rod is formed on the gasket.

[0003] The above-mentioned lifting adjustment of the electric wheelchair armrest is achieved by twisting the eccentric wrench, the screw rod is withdrawn or pressed into the armrest adjusting pipe to loosen or press the armrest adjusting pipe to adjust the lifting and fixation, and each adjustment is achieved by rotating the eccentric wrench; the thread of the threaded hole of the newly purchased product is relatively complete and good; due to the thin wall of the armrest mounting pipe, the number of thread turns of the threaded hole is small, but after repeated adjustment and use, some people with strong physical strength are affected by the large torsion force between the screw rod and the threaded hole, the thread of the threaded hole is easily worn off / twisted off, and after that, the screw rod cannot be tightened again, and the screw structure cannot be adjusted for a long time.

[0004] 2. The lifting adjustment of the chair armrest of some existing products is achieved by arranging a plurality of high and low position holes and elastic locking pins between the outer fixed pipe and the inner lifting pipe, pressing the elastic locking pin to retract, then pulling or pressing the inner lifting pipe, adjusting to the appropriate height, and then releasing the hand, the elastic locking pin falls into the position hole at the corresponding height to fix the height of the chair armrest; the elastic locking pin has a small volume, the protruding pressing head is small, it is difficult for people with small physical strength, the old, the weak, the sick and the disabled to press the elastic locking pin, or they cannot press the elastic locking pin, and it is difficult to adjust the lifting height of the chair armrest; moreover, this requires two hands to adjust, which is relatively troublesome. SUMMARY

[0005] To solve the above-mentioned technical problems, this utility model provides a chair armrest lifting adjustment device with a reasonable structural design and convenient adjustment of the chair armrest height.

[0006] The solution to the above technical problem is as follows:

[0007] A height adjustment device for a chair armrest includes a handrest, a height adjustment mechanism, an outer vertical tube, an inner vertical tube, and a lever. The bottom of the handrest is fixedly connected to the top of the outer vertical tube. The inner vertical tube is inserted into the outer vertical tube from the bottom and passes through the outer vertical tube. A height adjustment mechanism is provided between the bottom of the handrest and the inner wall of the inner vertical tube. A lever is fixedly connected to the top of the height adjustment mechanism. The outer part of the lever extends outward. The lever is operated from the outside to control the locking and unlocking of the height adjustment mechanism.

[0008] The advantages of this utility model's lifting and adjusting device for chair armrests are as follows: 1. This product conceals the lifting and adjusting mechanism within the outer and inner vertical tubes. A lever is fixedly connected to one side of the top of the lifting and adjusting mechanism, extending outwards. The lever is located near the lower outer side of the armrest, making it easily accessible and operable. During operation, a gentle upward pull with one hand unlocks the lifting and adjusting mechanism, allowing for simultaneous lifting or lowering of the armrest. The outer vertical tube rises and falls synchronously. Upon releasing the lever, it returns to its original position, automatically resetting and locking the lifting and adjusting mechanism to the desired armrest height, suitable for people of different heights and builds. This structure allows wheelchair users to easily operate and adjust the armrest height with one hand from one side. 2. This structure is particularly suitable for the elderly, weak, sick, and disabled individuals with limited hand strength, offering ease of use. 3. This structure prevents thread stripping. Attached Figure Description

[0009] Figure 1 This is a perspective view of the product of this utility model;

[0010] Figure 2 This is a side view of the product of this utility model;

[0011] Figure 3 for Figure 2 AA-direction cross section;

[0012] Figures 4 to 6 This is an exploded view of the product of this utility model;

[0013] Figure 7 , Figure 8 This is a perspective view of the elastic locking device of this utility model installed at the bottom of the hand rest;

[0014] Figure 9 This is a side view of the elastic locking device of this utility model installed at the bottom of the hand rest;

[0015] Figure 10 This is a perspective view of the bottom of the hand support of the present invention;

[0016] Figure 11 , Figure 12 This is a perspective view of the top plate, front hanging shaft, rear hanging shaft, vertical strip, hook, and buckle connection structure of the present utility model.

[0017] Hand support 1, spring column 11, outer vertical tube 2, notch 201, front guard plate 202, rear guard plate 203, lower vertical section of outer tube 21, widened opening section of top section of outer tube 22, front axle seat 2A, rear axle seat 2B, inner vertical tube 3, front mounting plate 31, rear mounting plate 32, lever 4, lifting adjustment device 5, position hole 51, elastic locking device 52, pressure spring 521, top plate 522, front hanging shaft 523, front axle hanging groove 524, rear hanging shaft 525, rear axle hanging groove 526, vertical strip 527, hook 528, spring recess 529. Detailed Implementation

[0018] like Figures 1 to 12The following describes a height adjustment device for a chair armrest, belonging to wheelchair components. The device includes a handrest 1, a height adjustment stop device 5, an outer vertical tube 2, an inner vertical tube 3, and a latch 4. The handrest 1 is made of plastic, rectangular and elongated, and is positioned on one side of the wheelchair to support the user's hand. The handrest 1 can be a single component or composed of multiple components fixedly connected together. The bottom of the handrest 1 is fixedly connected to the top of the outer vertical tube 2, which supports the handrest 1. The handrest 1 and the outer vertical tube 2 form a T-shape when connected. The inner vertical tube 3 is inserted into the bottom of the outer vertical tube 2, and its shape matches the shape of the inner tube hole of the outer vertical tube 2 perfectly. The inner vertical tube 3 passes through the outer vertical tube 2. A height adjustment stop device 5 is provided between the bottom of the handrest 1 and the inner wall of the inner vertical tube 3. A latch 4 is fixedly connected to one side of the top of the height adjustment stop device 5. The outer end is a plate structure with a large handhold area for easy operation. The outer section of the lever 4 extends outward, controlling the locking and unlocking of the lifting adjustment device 5. The lifting adjustment device 5 is concealed within the outer vertical tube 2 and inner vertical tube 3. A lever 4 is fixedly connected to the top side of the lifting adjustment device 5, extending outward. The lever 4 is located near the lower outer side of the handrest 1 for easy access and operation. During operation, a gentle upward pull with one hand unlocks the lifting adjustment device 5, allowing for simultaneous lifting or lowering of the handrest 1. The outer vertical tube 2 rises and falls synchronously. After releasing the lever, it returns to its original state, and the lifting adjustment device 5 automatically resets and locks at the desired height, suitable for people of different heights and builds. This structure allows wheelchair users to easily adjust the armrest height with one hand from one side. This structure is particularly suitable for the elderly, weak, sick, and disabled individuals with limited strength, offering great ease of use. The above structure will not have the problem of thread stripping and thus cannot be locked.

[0019] Further, in the preferred technical solution: the lifting adjustment device 5 includes a plurality of adjustment holes 51 with varying heights and an elastic locking device 52. The middle section of the inner vertical tube 3 has a plurality of adjustment holes 51 with varying heights. There are generally two to six adjustment holes 51. The maximum distance between the vertical adjustment holes is generally 5 cm to 10 cm. The plurality of adjustment holes 51 are integrally formed with the inner vertical tube 3. The plurality of adjustment holes 51 are vertically aligned and in the same row. The top of the elastic locking device 52 is movably connected to the bottom of the hand support 1. The top of the elastic locking device 52 is fixedly connected to the inner end of the buckle 4. The bottom of the elastic locking device 52 can be unlocked and locked with the adjustment holes 51 of different heights. The external operating lever 4 controls the elastic locking device 52 to lock and unlock at different heights of the stop holes 51. The above is a further refinement of the lifting adjustment device 5. This structure can achieve automatic reset locking, so that after releasing the hand, the bottom of the elastic locking device 52 will automatically reset and lock in conjunction with the stop holes 51 at different heights, eliminating the need for manual locking and making operation simple. When in use, gently pull the lever 4 upward with one hand to pull the elastic locking device 52, and the bottom of the elastic locking device 52 will disengage from the stop hole 51. After releasing the hand, the elastic locking device 52 will automatically reset using its own reset elasticity, and the bottom of the elastic locking device 52 will fall into the corresponding stop hole 51 to lock.

[0020] Further, in the preferred technical solution: the elastic locking device 52 includes a pressure spring 521, a top plate 522, a front hanging shaft 523, a front axle hanging groove 524, a rear hanging shaft 525, a rear axle hanging groove 526, a vertical strip 527, and a hook 528; the vertical strip 527 and the hook 528 are arranged in the pipe hole of the inner vertical tube 3; the inner wall of the top opening of the outer vertical tube 2 is provided with corresponding front axle hanging grooves 524 and rear axle hanging grooves 526 at the front and rear, respectively; the front hanging shaft 523 and the rear hanging shaft 525 are fixedly connected to the front and rear of the top plate 522, respectively, and the front hanging shaft 523 and the rear hanging shaft 525 are embedded in the corresponding front axle hanging grooves 524. The rear axle mounting groove 526 is movably connected to the top plate 522. The front mounting shaft 523 and rear mounting shaft 525 are supported by the front axle mounting groove 524 and rear axle mounting groove 526. A vertical strip 527 is longitudinally fixedly connected to the inner bottom of the top plate 522. A hook 528 is fixedly connected to the bottom end of the vertical strip 527. The length of the vertical strip 527 is 10 cm to 20 cm. The hook 528 can be unlocked and locked with the stop holes 51 of different heights. A notch 201 is opened on the top outer wall of the outer vertical tube 2. A buckle 4 is fixedly connected to the outer wall of the top plate 522. The outer section of the buckle 4 passes through the notch 201 and extends outward. The opening 201 provides a through-hole and movement space for the latch 4; a pressure spring 521 is clamped between the bottom outer side of the hand support 1 and the top outer side of the top plate 522. The pressure spring 521 and the vertical strip 527 are staggered between the top outer side of the top plate 522 and the bottom inner side of the top plate 522, forming a lever-like tilting action; the top plate 522 is movable to the bottom of the hand support 1 through the pressure spring 521; in use, gently pull the latch 4 upward with one hand, the latch 4 flips upward and lifts, the top plate 522 flips simultaneously, the inner side of the top plate 522 flips and falls, and the top plate 522 is connected to the front hanging shaft 5. 23. The rear hanging shaft 525 rotates synchronously, the vertical strip 527 rotates synchronously, and the hook 528 disengages synchronously from the stop hole 51, completing the unlocking. Then, by lifting or pressing down the hand support 1, the hand support 1 can be adjusted in height. The outer vertical tube 2 rises and falls synchronously. After adjusting to the appropriate height, release the hand, and the lever 4 and top plate 522 will be pressed down by the rebound force. The outer side of the top plate 522 will rotate and descend, the lever 4 will rotate and descend synchronously, the inner side of the top plate 522 will rotate and rise, the vertical strip 527 will rotate and reset synchronously, and the hook 528 will insert into the stop hole 51 to hook the wall of the inner vertical tube 3, completing the locking and restoring the original state. The height of the handrail is now fixed. The above is a further detailed structure of the elastic locking device 52. This lever-type operation unlocking and locking structure requires little force, saves effort, and is easy to unlock, making it especially suitable for the elderly, weak, sick, and disabled people whose hand strength is insufficient.

[0021] Further refinement of the preferred technical solution: The outer vertical tube 2 is integrally injection molded, resulting in high production efficiency, low cost, and one-time molding; the outer vertical tube 2 is rectangular to prevent natural rotation, eliminating the need for a separate structure to prevent circumferential rotation; the outer vertical tube 2 includes a vertical lower section 21 and a widened opening section 22 at the top of the outer tube; the inner wall of the widened opening section 22 at the top of the outer tube has a front axle seat 2A and a rear axle seat 2B extending protruding from the front and rear, respectively; the front axle seat 2A and the rear axle seat 2B are also part of the outer vertical tube 2; the front axle seat 2A and the rear axle seat 2B... The top of the bearing seat 2B is respectively provided with corresponding front axle mounting groove 524 and rear axle mounting groove 526 to form a relatively stable structure that allows the front axle 523 and rear axle 525 to rotate. A suitable installation structure for the front axle 523 and rear axle 525 is provided for easy assembly. The front axle mounting groove 524 and rear axle mounting groove 526 are horizontal and coaxially arranged. A notch 201 is opened on the outer wall of the widened opening section 22 of the top section of the outer tube. The inner vertical tube 3 is inserted into the lower vertical section 21 of the outer tube.

[0022] Further, the preferred technical solution is as follows: the inner vertical tube 3 is integrally injection molded, which has high production efficiency, low cost, and is formed in one step; the inner vertical tube 3 is rectangular, which is compatible with the rectangular outer vertical tube 2, and also prevents natural rotation, so there is no need to set up a structure to prevent circumferential rotation.

[0023] Further, in the preferred technical solution: the opening of the widened opening section 22 of the outer tube top section is a rectangular flared mouth, facing upward, thereby increasing the opening of the widened opening section 22 of the outer tube top section to provide more space for the pressure spring 521, top plate 522, front hanging shaft 523, front axle hanging groove 524, rear hanging shaft 525, rear axle hanging groove 526, and buckle 4.

[0024] The top plate 522, front hanging shaft 523, rear hanging shaft 525, vertical strip 527, hook 528, and buckle 4 are integrally injection molded, resulting in high production efficiency, low cost, and one-time molding.

[0025] The bottom of the hand support 1 is fixedly connected to the front axle seat 2A and the rear axle seat 2B by a screw assembly. The edge wall of the widened opening section 22 of the outer tube top section is fixedly connected to the bottom of the hand support 1, and the connection structure is firm.

[0026] The front and rear side walls of the outer vertical tube 2 are respectively extended with corresponding front guard plate 202 and rear guard plate 203, which are used to protect people sitting in wheelchairs and prevent them from falling out of the wheelchair.

[0027] The bottom front and rear side walls of the inner vertical tube 3 are respectively extended with corresponding front mounting plates 31 and rear mounting plates 32 for connecting and installing the side frame of the wheelchair.

[0028] A spring post 11 is fixedly extended downward from the bottom outer side of the hand support 1, and a spring recess 529 is opened on the top outer side of the top plate 522. The spring post 11 is inserted into the top of the pressure spring 521, and the bottom of the pressure spring 521 is inserted into the spring recess 529 for positioning and fixing, which improves the stability of spring installation and has good anti-dislodgement ability.

Claims

1. A height adjustment device for a chair armrest, comprising a hand rest and a height adjustment mechanism, characterized in that: It also includes an outer vertical tube, an inner vertical tube, and a lever; the bottom of the hand support is fixedly connected to the top of the outer vertical tube, the inner vertical tube is inserted into the outer vertical tube from the bottom, and the inner vertical tube passes through the outer vertical tube. A lifting adjustment device is provided between the bottom of the hand support and the inner wall of the inner vertical tube. A lever is fixedly connected to the top of the lifting adjustment device, and the outer section of the lever extends outward. The lever is operated from the outside to control the locking and unlocking of the lifting adjustment device.

2. The lifting and adjusting device for a chair armrest according to claim 1, characterized in that: The lifting adjustment device includes several adjustment holes with varying heights and an elastic locking device. The middle section of the inner vertical tube has several adjustment holes with varying heights, which are vertically aligned. The top of the elastic locking device is movably connected to the bottom of the hand support. The top side of the elastic locking device is fixedly connected to the inner end of the lever. The bottom of the elastic locking device can be unlocked and locked with the adjustment holes at different heights. The lever can be operated externally to control the locking and unlocking of the elastic locking device at different heights.

3. The lifting and adjusting device for a chair armrest according to claim 2, characterized in that: The elastic locking device includes a pressure spring, a top plate, a front hanging shaft, a front axle hanging groove, a rear hanging shaft, a rear axle hanging groove, a vertical strip, and a hook. The vertical strip and the hook are arranged inside the pipe hole of the inner vertical tube. The inner wall of the top opening of the outer vertical tube is provided with corresponding front axle hanging grooves and rear axle hanging grooves at the front and rear, respectively. The front and rear hanging shafts are fixedly connected to the front and rear of the top plate, respectively. The front and rear hanging shafts are movably connected to the corresponding front and rear axle hanging grooves. The vertical strip is fixedly connected longitudinally to the inner bottom of the top plate, and the bottom end of the vertical strip is fixedly connected to the hook. The hook can be unlocked and locked with stop holes of different heights. A notch is opened on the outer top wall of the outer vertical tube. A buckle is fixedly connected to the outer wall of the top plate, and the outer section of the buckle passes through the notch and extends outward. A pressure spring is sandwiched between the outer bottom of the hand support and the outer top of the top plate. The pressure spring and the vertical strip are staggered between the outer top of the top plate and the inner bottom of the top plate.

4. The lifting and adjusting device for a chair armrest according to claim 3, characterized in that: The outer vertical tube is integrally injection molded; the outer vertical tube is rectangular and includes a vertical lower section and a widened opening section at the top of the outer tube. The inner wall of the widened opening section at the top of the outer tube has a front axle seat and a rear axle seat extending forward and backward, respectively. The top of the front axle seat and the rear axle seat are respectively provided with corresponding front axle hanging grooves and rear axle hanging grooves; a notch is opened on the outer wall of the widened opening section at the top of the outer tube; the inner vertical tube is inserted into the vertical lower section of the outer tube.

5. The lifting and adjusting device for a chair armrest according to claim 4, characterized in that: The inner vertical tube is integrally injection molded; the inner vertical tube is rectangular and is adapted to the rectangular outer vertical tube.

6. The lifting and adjusting device for a chair armrest according to claim 4, characterized in that: The opening of the widened opening section at the top of the outer tube is a rectangular flared mouth, facing upwards.

7. A lifting and adjusting device for a chair armrest according to any one of claims 3 to 6, characterized in that: The top plate, front hanging shaft, rear hanging shaft, vertical strip, hook, and buckle are integrally injection molded.

8. A lifting and adjusting device for a chair armrest according to any one of claims 4 to 6, characterized in that: The bottom of the hand rest is fixedly connected to the front axle seat and the rear axle seat by a screw assembly, and the edge wall of the widened opening section of the top section of the outer tube is fixedly connected to the bottom of the hand rest.

9. A lifting and adjusting device for a chair armrest according to any one of claims 1 to 6, characterized in that: The front and rear sidewalls of the outer vertical tube are respectively extended with corresponding front and rear protective plates.

10. A lifting and adjusting device for a chair armrest according to any one of claims 1 to 6, characterized in that: The bottom front and rear sidewalls of the inner vertical tube are respectively extended with corresponding front mounting plates and rear mounting plates.

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