Width-adjustable armrest and seat

Abstract

The utility model discloses a width adjustable armrest and seat, including armrest and width adjusting mechanism, the width adjusting mechanism includes centre shaft, shaft sleeve and locating piece, one end of centre shaft with the armrest fixed connection, the other end of centre shaft coaxially sleeve outside the shaft sleeve; one of the outer side wall of the middle shaft and the inner wall of the shaft sleeve is provided with a convex part, the other one of the outer side wall of the middle shaft and the inner wall of the shaft sleeve is provided with a groove along the direction of the central shaft, and the convex part is matched and connected with the groove, so that the middle shaft is circumferentially positioned relative to the shaft sleeve and can axially slide; and the positioning piece is arranged at the other end of the shaft sleeve and can extend into the shaft sleeve to position the middle shaft. The device has the advantages of being simple in structure, convenient to adjust and low in cost.

Description

Technical Field

[0001] The utility model relates to a chair armrest, in particular to an armrest with adjustable width. Background Art

[0002] In order to facilitate storage or carrying, existing mobility tools are generally designed to be foldable to make them smaller. Therefore, the armrests of mobility tools are also foldable. However, the width of the armrests of mobility tools is fixed, which cannot perfectly meet the comfort needs of users of different body shapes. Most of the width-adjustable mechanisms used in mobility tools on the market have complex structures, occupy a large amount of space around the armrests, are not conducive to folding, and are also very expensive. Utility Model Content

[0003] The utility model aims to provide a width-adjustable handrail which has a simple structure, is convenient to adjust and has a low cost.

[0004] Another object of the utility model is to provide a chair with adjustable armrest width, simple and convenient adjustment and low cost.

[0005] In order to achieve the above-mentioned purpose, the width-adjustable armrest provided by the utility model includes an armrest and a width-adjusting mechanism, the width-adjusting mechanism includes a central axis, a sleeve and a positioning piece, one end of the central axis is fixedly connected to the armrest, and the other end of the central axis is coaxially sleeved on the outside of the sleeve; one of the outer wall of the central axis and the inner wall of the sleeve is provided with a convex portion, and the other is provided with a groove along the direction of the central axis, the convex portion is matched with the groove to make the central axis circumferentially positioned relative to the sleeve and axially slidable; the positioning piece is arranged at the other end of the sleeve and can extend into the sleeve to position the central axis.

[0006] Compared with the prior art, the utility model coaxially sleeves the central axis on the outside of the sleeve, and the central axis and the sleeve are connected by a convex portion and a concave portion, so that the central axis is circumferentially positioned relative to the sleeve and can slide axially, and then the central axis is positioned relative to the sleeve by a positioning piece. Therefore, by connecting the armrest to the central axis, the armrest can slide relative to the sleeve, thereby achieving adjustable width position of the armrest. The structure is simple, and adjustment can be made by only twisting the positioning piece, which is very convenient to operate and effectively reduces costs.

[0007] Preferably, the width-adjustable armrest further comprises a mounting seat, and one end of the sleeve is coaxially and rotatably sleeved in the mounting seat. By providing the mounting seat and making the sleeve rotatable relative to the mounting seat, when the sleeve rotates, it can drive the central axis and the armrest to rotate, so that the armrest can achieve circumferential rotation adjustment, thereby improving the functional diversity of the armrest.

[0008] Preferably, a threaded hole is formed at the other end of the sleeve, and the positioning member has a stud, which is threadably connected to the threaded hole and extends into the sleeve to abut against the central axis.

[0009] Preferably, a receiving groove is provided on the outer side of the central axis, a protrusion is provided in the receiving groove and extends out of the receiving groove, the protruding part of the protrusion forms the convex part, and the inner side wall of the sleeve has the groove along a direction parallel to the central axis.

[0010] Specifically, the receiving groove extends in a direction parallel to the central axis, and the protrusion is fixedly connected to the receiving groove by screws.

[0011] Specifically, the protrusion is provided with a threaded countersunk hole, the inner bottom surface of the receiving groove is provided with a threaded blind hole, the screw is threadedly connected to the threaded countersunk hole and the threaded blind hole, and the screw head of the screw is located in the countersunk hole.

[0012] Preferably, an engaging surface is provided at one end of the sleeve away from the positioning member.

[0013] Preferably, the armrest includes an armrest body and an angle adjustment mechanism, the angle adjustment mechanism includes a connecting member, an adjusting member and a driving member, one end of the connecting member is fixedly connected to the central axis, one end of the adjusting member is pivotally connected to the connecting member through a pivot shaft, and the other end of the adjusting member is connected to the armrest body; the driving member is axially fixed and circumferentially rotatable on the connecting member and one end is threadedly connected to the adjusting member to drive the adjusting member to rotate a certain angle around the pivot shaft when rotating.

[0014] Specifically, a mounting portion extends from one side of the connecting member, and the mounting portion is provided with an elongated through hole for the stud of the driving member to pass through, and the driving member is movably arranged on the elongated through hole.

[0015] A chair comprises a chair back, a chair seat and an armrest with adjustable width, wherein the chair back is arranged on the chair seat and the armrest with adjustable width is arranged on the chair back. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model seat.

[0017] Figure 2 The utility model is a structural diagram of a width-adjustable armrest of a seat.

[0018] Figure 3 It is an exploded view of the width-adjustable armrest of the seat of the utility model.

[0019] Figure 4 It is a cross-sectional view of the width-adjustable armrest of the seat of the utility model.

[0020] Figure 5 This is a state diagram of the width-adjustable armrest of the seat of the utility model after the width is adjusted.

[0021] Figure 6 The utility model is an exploded view of the angle adjustment mechanism of the armrest of the seat.

[0022] Figure 7 It is a cross-sectional view of the angle adjustment mechanism of the armrest of the seat of the utility model.

[0023] Figure 8 This is a state diagram of the angle adjustment mechanism of the armrest of the seat of the utility model after adjusting the angle. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0025] like Figures 1 to 4 As shown, the seat 100 of the utility model is suitable for a mobility scooter or a wheelchair, and comprises a width-adjustable armrest 1, a seat back 2 and a seat 3. The seat back 2 is arranged on the seat 3, and the width-adjustable armrest 1 is arranged on the seat back 2 and is symmetrically located on both sides of the seat 3. A space for a user to sit is formed between the two width-adjustable armrests 1 and the seat 3. The width-adjustable armrest 1 comprises an armrest 11 and a width-adjusting mechanism 12, and the width-adjusting mechanism 12 can adjust the width of the armrest 11. The width adjustment mechanism 12 includes a central axis 121, a sleeve 122 and a positioning member 123. One end of the central axis 121 is fixedly connected to the armrest 11, and the other end of the central axis 121 is coaxially sleeved outside the sleeve 122. The central axis of the central axis 121 extends along the left and right directions of the seat. One of the outer wall of the central axis 121 and the inner wall of the sleeve 122 is provided with a convex portion, and the other is provided with a groove 1222 along the central axis direction. The convex portion is matched and connected with the groove 1222, so that the central axis 121 is circumferentially positioned relative to the sleeve 122 and can slide axially. The positioning member 123 is arranged at the other end of the sleeve 122 and can extend into the sleeve 122 to position the central axis 121, so that the central axis 121 cannot slide along the central axis direction.

[0026] Please see again Figure 3 and Figure 4 The width-adjustable armrest 1 also includes a mounting seat 13, which is a cylindrical structure. The mounting seat 13 is fixedly mounted on the chair back 2. One end of the sleeve 122 is coaxially and rotatably sleeved in the mounting seat 13. By providing the mounting seat 13 and making the sleeve 122 rotatable relative to the mounting seat 13, when the sleeve 122 rotates, it can drive the central axis 121 and the armrest 11 to rotate, so that the armrest 11 can achieve circumferential rotation adjustment, thereby improving the functional diversity of the armrest 11. A snap-fit ​​surface 131 is provided at one end of the sleeve 122 away from the positioning member 123. Through the snap-fit ​​surface 131, a driving mechanism can be snapped onto the snap-fit ​​surface 131, so that the sleeve 122 can be driven to rotate relative to the mounting seat 13. In addition, the driving mechanism can also be linked with the chair back 2 or the seat 3. When the chair back 2 or the seat 3 is folded relative to the mobility scooter, the shaft sleeve 122 can be driven to rotate through the linkage of the driving mechanism to achieve the purpose of automatically folding the armrest 11. Since the driving mechanism is not the focus of this solution, it will not be described in detail here.

[0027] Please see again Figure 3 and Figure 4 The other end of the sleeve 122 is provided with a threaded hole 1221, and one end of the positioning member 123 is provided with a stud 1231, which is threadedly connected to the threaded hole 1221 and extends into the sleeve 122 to abut against the central axis 121, so that the central axis 121 is fixed relative to the positioning member 123. The other end of the positioning member 123 is provided with an operating handle 1232, so that the stud 1231 can be conveniently screwed into the threaded hole 1221. In this way, the central axis 121 can be locked or unlocked by twisting the positioning member 123 to increase the convenience of adjusting the width of the handrail 11.

[0028] Please see again Figure 3 and Figure 4, a receiving groove 1211 is provided on the outer side of the central axis 121, and a protrusion 1212 protruding out of the receiving groove 1211 is provided in the receiving groove 1211. Specifically, the receiving groove 1211 extends in a direction parallel to the central axis, the protrusion 1212 is provided with a threaded countersunk hole 1212a, and the inner bottom surface of the receiving groove 1211 is provided with a threaded blind hole 1211a, and the protrusion 1212 is fixedly connected to the receiving groove 1211 by a screw 1213. The screw 1213 is threadedly connected to the threaded countersunk hole 1212a and the threaded blind hole 1211a, and the screw head of the screw 1213 is located in the threaded countersunk hole 1212a. The part of the protrusion 1212 protruding from the receiving groove 1211 in this solution forms the convex portion, and the inner side wall of the sleeve 122 is provided with the groove 1222 in a direction parallel to the central axis.

[0029] See also Figure 1 , Figure 2 as well as Figure 6 and Figure 7The armrest 11 includes an armrest body 111 and an angle adjustment mechanism 5, one end of the angle adjustment mechanism 5 is fixedly connected to the central axis 121 and connected to the armrest body 111. The angle adjustment mechanism 5 is used to adjust the angle of the armrest body 111 relative to the horizontal plane or the height relative to the seat 3. Specifically, the angle adjustment mechanism 5 includes a connecting member 51, an adjusting member 52 and a driving member 53, one end of the connecting member 51 is fixedly connected to one end of the central axis 121, one end of the adjusting member 52 is pivotally connected to the connecting member 51 through a pivot shaft 521, and the pivot shaft 521 is arranged in a horizontal direction and extends along the front and rear directions of the chair back 2. The other end of the adjusting member 52 is connected to the armrest body 111; the central axis of the pivot shaft 521 extends along the front and rear directions of the seat 100. The driving member 53 is axially fixed and circumferentially rotatably arranged on the connecting member 51, and the driving member 53 has a stud 531. The adjusting member 52 is provided with a threaded hole 522, and the stud 531 is threadedly connected to the threaded hole 522. The central axis of the driving member 53 is perpendicular to the central axis of the pivot shaft 521. When the driving member 53 rotates, the connecting member 51 and the adjusting member 52 can move relative to each other, thereby driving the adjusting member 52 to rotate relative to the connecting member 51 around the pivot shaft 521, so that the armrest body 111 as a whole rotates a certain angle relative to the pivot shaft 521. A handle 532 is provided at the end of the driving member 53, and the handle 532 can be conveniently held by the user to twist the stud 531 of the driving member 53, thereby improving the convenience of operation. Since one end of the adjusting member 52 is pivotally connected to the connecting member 51 through the pivot shaft 521, and the other end of the adjusting member 52 is connected to the armrest body 111; and an axially fixed and circumferentially rotatable driving member 53 is provided on the connecting member 51, so that the driving member 53 is threadedly connected to the adjusting member 52, therefore, by driving the driving member 53 to rotate, the adjusting member 52 can be driven to rotate a certain angle around the pivot shaft 521 by utilizing the characteristics of the threaded connection; thereby achieving the adjustable position of the armrest relative to the seat 100 as a whole, and the structure is simple, and only the driving member 53 needs to be twisted to adjust, which is very convenient to operate and effectively reduces the cost. More specifically, the adjusting member 52 is a bent structure, and the bent adjusting member 52 is connected to the armrest body 111, so that the extension direction of the armrest body 111 is in the same direction as the extension direction of the pivot shaft 521. In this way, the armrest body 111 can also extend along the front and rear directions of the seat 100. Therefore, when the armrest body 111 as a whole is rotated a certain angle relative to the pivot shaft 521, the armrest as a whole can be adjusted in both the height and width directions relative to the seat to avoid the phenomenon of unevenness at the front and rear ends, thereby better adapting to users of different body shapes and effectively improving comfort.

[0030] Please see again Figure 6 and Figure 7 , a mounting portion 511 extends from one side of the connecting member 51, and the mounting portion 511 is provided with an elongated through hole 5111 for the stud 531 to pass through, and the elongated through hole 5111 is arranged and extends in a horizontal direction. The driving member 53 is movably arranged on the elongated through hole 5111. The stud 531 is provided with limiting portions 5311 on the opposite sides of the mounting portion 511, and the two limiting portions 5311 jointly limit the axial position of the driving member 53, so that the driving member 53 is positioned on the elongated through hole 5111. In this way, the driving member 53 can not only rotate to adjust the swing angle of the adjusting member 52, but also slide on the elongated through hole 5111 to prevent interference with the adjusting member 52 when it swings. Specifically, the adjusting member 52 is provided with an avoidance groove 523 on one side facing the stud 531 for the mounting portion 511 to enter and exit when adjusting the angle. The avoidance groove 523 can prevent the adjusting member 52 from interfering with the mounting portion 511 below when adjusting the angle. The adjusting member 52 is provided with a receiving hole, and a nut 54 is fixedly provided in the receiving hole to form the threaded hole 522. In this solution, the mounting portion 511 is located on the lower bottom surface of the connecting member 51, the avoidance groove is located on the lower bottom surface of the adjusting member 52, and the driving member 53 extends upward from the lower side into the elongated through hole 5111 and the threaded hole 522, so that the handle 532 can be located at the bottom of the connecting member 51, which neither hinders the operation nor affects the overall aesthetics.

[0031] Combining the above and Figure 5 and Figure 8 The working principle of the utility model of the adjustable width armrest 1 is described in detail as follows:

[0032] like Figure 5 As shown, when the width of the armrest 11 needs to be adjusted, the operating handle 1232 is twisted to make the stud 1231 of the positioning member 123 rotate and leave the central axis 121. At this time, the central axis 121 is released from the limit, and the entire armrest 11 is pulled to make the central axis 121 slide in the sleeve 122. At this time, the protrusion 1212 slides in the groove, and the armrest 11 can move away from the chair back 2 to achieve width adjustment. After adjusting to a suitable width, the operating handle 1232 only needs to be tightened to make the stud 1231 press against the central axis 121 again to lock the armrest 11.

[0033] like Figure 8As shown, when the angle of the armrest 11 needs to be adjusted, the handle 532 is turned to rotate the driving member 53 relative to the nut 54. At this time, the stud 531 of the driving member 53 drives the nut 54 to move relatively away from or close to the driving member 53, and the nut 54 drives the adjusting member 52 to rotate around the pivot shaft 521, so that the armrest body 111 swings upward or downward relative to the connecting member 51. At this time, it is only necessary to continue to turn the handle 532 to adjust the armrest body 111 to a suitable position.

[0034] Compared with the prior art, the utility model coaxially sleeves the central axis 121 on the outside of the sleeve 122, and the central axis 121 and the sleeve 122 are connected by a convex portion and a groove, so that the central axis 121 is circumferentially positioned relative to the sleeve 122 and can slide axially, and then the central axis 121 is positioned relative to the sleeve 122 by the positioning member 123. Therefore, by connecting the armrest 11 to the central axis 121, the armrest 11 can slide relative to the sleeve 122, so that the width position of the armrest 11 can be adjusted. The structure is simple, and it can be adjusted by only twisting the positioning member 123. The operation is very convenient and the cost is effectively reduced.

[0035] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A width-adjustable armrest, characterized in that: It includes an armrest and a width adjustment mechanism, and the width adjustment mechanism includes a central axis, a sleeve and a positioning piece. One end of the central axis is fixedly connected to the armrest, and the other end of the central axis is coaxially sleeved in the sleeve; one of the outer wall of the central axis and the inner wall of the sleeve is provided with a convex portion, and the other is provided with a groove along the central axis direction, and the convex portion is matched with the groove to position the central axis circumferentially relative to the sleeve and axially slidable; the positioning piece is arranged at the other end of the sleeve and can extend into the sleeve to position the central axis.

2. The width-adjustable armrest according to claim 1, characterized in that: The width-adjustable armrest also includes a mounting seat, and one end of the shaft sleeve is coaxially and rotatably sleeved in the mounting seat.

3. The width-adjustable armrest according to claim 1, characterized in that: A threaded hole is formed at the other end of the shaft sleeve, and the positioning member has a stud, which is threadably connected to the threaded hole and extends into the shaft sleeve to abut against the central shaft.

4. The width-adjustable armrest according to claim 1, characterized in that: The outer side of the central axis is provided with a receiving groove, the receiving groove is provided with a protrusion protruding out of the receiving groove, the protruding part of the protrusion forms the convex part, and the inner side wall of the sleeve is provided with the groove in a direction parallel to the central axis.

5. The width-adjustable armrest according to claim 4, characterized in that: The receiving groove extends in a direction parallel to the central axis, and the protrusion is fixedly connected to the receiving groove by screws.

6. The width-adjustable armrest according to claim 5, characterized in that: The protrusion is provided with a threaded countersunk hole, the inner bottom surface of the accommodating groove is provided with a threaded blind hole, the screw is threadedly connected to the threaded countersunk hole and the threaded blind hole, and the screw head of the screw is located in the countersunk hole.

7. The width-adjustable armrest according to claim 1, characterized in that: An end of the shaft sleeve away from the positioning member is provided with a clamping surface.

8. The width-adjustable armrest according to claim 1, characterized in that: The armrest includes an armrest body and an angle adjustment mechanism, and the angle adjustment mechanism includes a connecting member, an adjusting member and a driving member, one end of the connecting member is fixedly connected to the central axis, one end of the adjusting member is pivotally connected to the connecting member through a pivot shaft, and the other end of the adjusting member is connected to the armrest body; the central axis of the pivot shaft extends along the front and rear directions of the seat; the driving member is axially fixed and circumferentially rotatable on the connecting member and one end is threadedly connected to the adjusting member to drive the adjusting member to rotate a certain angle around the pivot shaft when rotating.

9. The width-adjustable armrest according to claim 8, characterized in that: A mounting portion extends from one side of the connecting member. The mounting portion is provided with an elongated through hole for the stud of the driving member to pass through. The driving member is movably arranged on the elongated through hole.

10. A seat, characterized in that: The invention comprises a chair back, a chair seat and the width-adjustable armrest as claimed in any one of claims 1 to 9, wherein the chair back is arranged on the chair seat, and the width-adjustable armrest is arranged on the chair back.

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