Office chair armrest

Abstract

The utility model discloses an office chair armrest, and belongs to the technical field of office chairs. The device comprises a handle; the base is mounted at the top of the handrail, a first rotating shaft is arranged in the center of the top of the base, a plurality of first positioning holes are annularly formed in the top of the base, and a limiting column is arranged at the top of the base; one end of the supporting handle is rotationally arranged at the top of the armrest handle through a first rotating shaft, a positioning cylinder is arranged at the bottom of the supporting handle, a first positioning column is slidably arranged in the positioning cylinder in the axis direction of the first rotating shaft, a first elastic piece is installed in the positioning cylinder, and an arc-shaped long cylinder allowing the limiting column to be embedded is arranged at the bottom of the supporting handle. The rotating perimeter of the first positioning column is the same as the distribution perimeter of the first positioning holes, so that materials between every two adjacent first positioning holes are not prone to abrasion, and the positioning effect of the first positioning holes is guaranteed. Meanwhile, the supporting handle can rotate relative to the first rotating shaft, so that the stability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of office chairs, in particular to an office chair armrest. Background Art

[0002] In order to provide a variety of comfortable armrest directions, the armrest handle of the office chair and the support handle of the armrest seat are often connected by rotation, and multiple positioning holes are opened on the outer circumference of the rotating shaft. A positioning column that can be embedded in the positioning hole for positioning is elastically provided on the support handle, and the positioning effect between the positioning column and the positioning hole is used to temporarily stabilize the direction of the armrest. However, since the distribution circumference of the positioning holes is shorter than the rotation circumference of the positioning column, the distance between two adjacent positioning holes is short. After rotating the support handle multiple times, the spacing material between the two adjacent positioning holes is easily worn, resulting in unstable positioning of the support handle. Utility Model Content

[0003] The utility model aims to provide an office chair armrest to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows: an office chair armrest comprises: an armrest; a base, the base is installed on the top of the armrest; a first rotating shaft is arranged at the center of the top of the base, a plurality of first positioning holes are arranged around the top of the base, and a limiting column is arranged on the top of the base; a support handle, one end of the support handle is rotatably arranged on the top of the armrest through the first rotating shaft, a positioning cylinder is arranged at the bottom of the support handle, a first positioning column is slidingly arranged in the positioning cylinder along the axial direction of the first rotating shaft, a first elastic member is installed in the positioning cylinder, the first elastic member provides elastic force to embed one end of the first positioning column into the first positioning hole, and an arc-shaped long cylinder for the limiting column to be embedded is arranged at the bottom of the support handle.

[0005] This technical solution has at least the following beneficial effects: the first positioning column is embedded in the first positioning hole along the axis direction of the first rotating shaft, and the first positioning holes are distributed circumferentially at the top of the base, so that when the support handle rotates relative to the handgrip, the rotation circumference of the first positioning column is the same as the distribution circumference of the first positioning hole, so that there can be a reasonable spacing between two adjacent first positioning holes, and the material in the spacing is not easily worn due to long-term friction, thereby ensuring the positioning function of the first positioning hole. At the same time, the first positioning hole is not set on the periphery of the first rotating shaft, which can make the rotation of the support handle relative to the first rotating shaft have higher stability.

[0006] As a further improvement of the above technical solution, a positioning plate sleeved on the first rotating shaft is provided on the top of the base, the first positioning hole is provided on the top of the positioning plate, and the positioning plate is provided with a through hole for the limiting column to pass through. The positioning plate can be made of a relatively wear-resistant material, so that the material between two adjacent first positioning holes is not easy to wear, further ensuring the positioning function of the first positioning holes. At the same time, positioning plates of different specifications and models can also be processed according to different rotation angle requirements to meet the different needs of users.

[0007] As a further improvement of the above technical solution, a gap is provided between the inner side of the positioning plate and the first rotating shaft, a sleeve sleeved on the first rotating shaft is provided at the bottom of the support handle, and the bottom of the sleeve is embedded in the gap, thereby increasing the contact area between the sleeve and the first rotating shaft and further improving the rotation stability between the support handle and the first rotating shaft.

[0008] As a further improvement of the above technical solution, a stepped groove is provided on the top of the first rotating shaft, an inner ring adapted to the stepped groove is provided on the inner side of the sleeve, a cover plate is installed on the top of the first rotating shaft, and the cover plate is pressed against the top of the inner ring. The position of the inner ring is limited by the cover plate and the bottom wall of the stepped groove, thereby limiting the longitudinal position of the support handle, which can facilitate the assembly of the support handle.

[0009] As a further improvement of the above technical solution, a limit ring sleeved on the first rotating shaft is arranged between the inner ring and the cover plate, a clamping block is arranged on the inner side of the limit ring, and a clamping groove for the clamping block to be embedded is provided on the outer side of the first rotating shaft, so as to prevent the cover plate from being worn by the inner ring.

[0010] As a further improvement of the above technical solution, a second rotating shaft is installed at the other end of the support handle, an armrest seat is rotatably installed on the second rotating shaft, a slider rotatably connected to the second rotating shaft is installed in the armrest seat, a second positioning column is arranged on the slider for horizontal sliding, a plurality of second positioning holes are arranged around the outer periphery of the second rotating shaft, a second elastic member is installed on the slider, and the second elastic member pushes the second positioning column to embed into the second positioning hole. The armrest seat can adjust a certain swing angle relative to the support handle to meet different needs of users.

[0011] As a further improvement of the above technical solution, the armrest seat is provided with a first slide groove for the rotating shaft to slide, the slider is arranged on the armrest seat for transverse sliding, the slider is arranged with a third positioning column for transverse sliding, a plurality of third positioning holes are arranged side by side on the side wall of the armrest seat, the slider is installed with a third elastic member, and the third elastic member pushes the third positioning column to embed into the third positioning hole. The armrest seat can adjust a certain transverse position relative to the support handle to meet different needs of users.

[0012] As a further improvement of the above technical solution, a first shielding cover is slidably provided at the bottom of the armrest seat, the first shielding cover is provided with a second slide groove for the rotation shaft to slide, the first shielding cover is slidably provided with a second shielding cover, the second shielding cover is provided with a third slide groove for the rotation shaft to slide, and the lengths of the first slide groove, the second slide groove and the third slide groove decrease in sequence. The first shielding cover and the second shielding cover can cover the opening position of the first slide groove, thereby preventing dust from entering the armrest seat.

[0013] As a further improvement of the above technical solution, an operating rod is rotatably provided at the top of the handrail, an extension rod is longitudinally slidably provided at the handrail, a plurality of fixing holes are longitudinally arranged side by side at the extension rod, a fixing block embedded in the fixing hole is provided at the bottom of the operating rod, a pressing block protruding from the outer wall of the handrail on one side is longitudinally slidably provided at the handrail, a lever is provided at the operating rod, the lever is plug-connected with the pressing block, a fourth elastic member is installed between the pressing block and the handrail, the fourth elastic member provides an elastic force to keep the pressing block at the bottom position, so as to push the operating rod to keep the fixing block embedded in the fixing hole. By pressing the pressing block upward, the operating rod can be driven to rotate by the lever, the fixing block can be extended out of the fixing hole, and the handrail can be pulled relative to the extension rod to adjust the height position of the handrail. After releasing the pressing block, the elastic force of the fourth elastic member is used to make the fixing block embedded in the fixing hole at a suitable height, so as to fix the height position of the handrail, thereby meeting the different requirements of users for the height of the armrest seat.

[0014] As a further improvement of the above technical solution, the fourth elastic member is a coil spring, and two ends of the coil spring are respectively installed on the top of the pressing block and the bottom of the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0017] Figure 2 A schematic diagram of the exploded structure of an embodiment of the utility model;

[0018] Figure 3 Another schematic diagram of the exploded structure of an embodiment of the utility model;

[0019] Figure 4 A schematic diagram of a cross-sectional structure of an embodiment of the utility model;

[0020] Figure 5 Another schematic diagram of the cross-sectional structure of an embodiment of the utility model;

[0021] Figure 6 : is a schematic diagram of the top surface of the slider in the embodiment of the utility model;

[0022] Figure 7 Schematic diagram of the bottom surface of the slider in the embodiment of the utility model.

[0023] 100, handrail; 200, base; 210, first rotating shaft; 220, positioning plate; 221, through hole; 230, first positioning hole; 240, limiting column; 250, arc-shaped long tube; 300, support handle; 310, positioning tube; 320, first positioning column; 330, first elastic member; 400, gap; 410, sleeve; 420, stepped groove; 430, inner ring; 440, cover plate; 450, limiting ring; 460, block; 470, slot; 500, handrail seat; 510, second Rotating shaft; 520, sliding block; 530, second positioning column; 531, second positioning hole; 540, second elastic member; 600, first slide groove; 610, third positioning column; 620, third positioning hole; 630, third elastic member; 700, first shielding cover; 710, second slide groove; 720, second shielding cover; 730, third slide groove; 800, operating rod; 810, extension rod; 820, fixing hole; 830, fixing block; 840, pressing block; 850, lever; 860, fourth elastic member. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Reference Figure 1-7 An office chair armrest includes an armrest 100 and a support handle 300. The bottom of the armrest 100 is installed on the side of the office chair seat cushion. A receiving groove is provided on the top of the armrest 100. A plurality of screw columns are provided in the receiving groove. A base 200 is embedded and installed at the top opening of the receiving groove. The base 200 is fixed on the screw columns by screws. A first rotating shaft 210 is integrally formed at the top center of the base 200. The first rotating shaft 210 is sleeved with a positioning plate 220. Two protrusions are asymmetrically provided at the bottom of the positioning plate 220. Grooves are provided at the top of the base 200 corresponding to the two protrusions, respectively. Thus, the positioning plate 220 can be stably and accurately installed on the top of the base 200 through the two protrusions and the two grooves.

[0029] Five first positioning holes 230 are symmetrically arranged on both sides of the top of the positioning plate 220, and the first positioning holes 230 are in the shape of a spherical bowl. A sleeve 410 is integrally formed at the bottom center of one end of the support handle 300, and the sleeve 410 is sleeved on the outside of the first rotating shaft 210, so that the support handle 300 can rotate around the axis of the first rotating shaft 210, and the bottom of the end of the support handle 300 is covered with the top of the handgrip 100, so that the support handle 300 is rotatably arranged relative to the handgrip 100. Positioning cylinders 310 are symmetrically integrally formed on both sides of the bottom of the support handle 300, and first positioning columns 320 are slidably arranged inside the two positioning cylinders 310, and the sliding direction of the first positioning column 320 in the positioning cylinder 310 is the same as the axial direction of the first rotating shaft 210. A first elastic member 330 is installed between one end of the first positioning column 320 and the bottom wall of the positioning cylinder 310. The distance between the first positioning column 320 and the axis of the first rotating shaft 210 is the same as the distance between the first positioning hole 230 and the axis of the first rotating shaft 210, that is, the elastic force of the first elastic member 330 can push the first positioning column 320 to extend out of the positioning cylinder 310 and embed in one of the first positioning holes 230 on the corresponding side, thereby realizing the positioning function of the support handle 300 relative to the rotation position of the handgrip 100. The two first positioning columns 320 are respectively embedded in one of the first positioning holes 230 on the corresponding side, which can improve the stability of positioning. The first elastic member 330 can be an elastic rubber block fixed to one end of the first positioning column 320 away from the positioning plate 220. In other embodiments, the first elastic member 330 can be a coil spring, one end of which presses against the bottom wall of the positioning cylinder 310, and the other end presses against one end surface of the first positioning column 320 away from the positioning plate 220.

[0030] An arc-shaped long cylinder 250 is also provided at the bottom of the support handle 300 near one end of the first rotating shaft 210, and an arc-shaped groove is provided inside the arc-shaped long cylinder 250, and the arc center of the arc-shaped groove is on the axis of the first rotating shaft 210. A limiting column 240 is integrally formed on the top of the base 200, and a through hole 221 is provided on the positioning plate 220. The limiting column 240 passes through the through hole 221 and is embedded in the arc-shaped groove. When the support handle 300 rotates relative to the handgrip 100, the limiting column 240 slides in the arc-shaped groove and is restricted by the two end walls of the arc-shaped groove, which can limit the rotation angle of the support handle 300 relative to the handgrip 100 and prevent the support handle 300 from excessively rotating.

[0031] The first positioning column 320 of the embodiment of the present application is embedded in the first positioning hole 230 along the axial direction of the first rotating shaft 210, and the first positioning holes 230 are distributed circumferentially at the top of the positioning plate 220, so that when the support handle 300 rotates relative to the handgrip 100, the rotation circumference of the first positioning column 320 is the same as the distribution circumference of the first positioning hole 230, so that there can be a reasonable spacing between two adjacent first positioning holes 230, and the material in the spacing is not easily worn due to long-term friction, thereby ensuring the positioning function of the first positioning hole 230. At the same time, the first positioning hole 230 is not set on the periphery of the first rotating shaft 210, so that the rotation of the support handle 300 relative to the first rotating shaft 210 has higher stability. And by selecting a material with higher wear resistance to make the positioning plate 220, the positioning function of the first positioning hole 230 can be further guaranteed.

[0032] A hole is opened in the middle of the positioning plate 220 for the first rotating shaft 210 to pass through, and the diameter of the hole is larger than the diameter of the first rotating shaft 210, so that when the positioning plate 220 is sleeved in the first rotating shaft 210, an annular gap 400 is provided between the positioning plate 220 and the first rotating shaft 210, and the end of the sleeve 410 away from the support handle 300 is just embedded in the gap 400 to stabilize the rotational movement of the positioning plate 220 relative to the first rotating shaft 210. At the same time, the contact area between the sleeve 410 and the first rotating shaft 210 is increased, which is beneficial to the rotational stability of the support handle 300 relative to the handgrip 100.

[0033] A stepped groove 420 is provided at the top of the first rotating shaft 210, and an inner ring 430 is integrally formed on the sleeve 410 at a position corresponding to the stepped groove 420. The first rotating shaft 210 is also sleeved with a cover plate 440 and a stop ring 450. When the sleeve 410 is sleeved in the first rotating shaft 210, the stop ring 450 and the cover plate 440 are sequentially inserted, so that the stop ring 450 abuts against the top of the inner ring 430, and the cover plate 440 abuts against the top of the stop ring 450. At the same time, the cover plate 440 also abuts against the top of the first rotating shaft 210, and the cover plate 440 and the first rotating shaft 210 are detachably fixedly connected by bolts. Therefore, it is convenient to assemble various components. Three clamping grooves 470 are provided at the top of the first rotating shaft 210, i.e., the top opening of the stepped groove 420, and three clamping blocks 460 are provided at the inner side of the limiting ring 450. When the limiting ring 450 is inserted into the first rotating shaft 210, the three clamping blocks 460 are correspondingly embedded in the three clamping grooves 470, thereby stabilizing the angular position of the limiting ring 450. In other embodiments, two or four clamping blocks 460 and clamping grooves 470 can be provided in combination according to actual conditions.

[0034] A hidden groove is provided at the top of the support handle 300 near one end of the first rotating shaft 210, and a plurality of hook grooves are provided around the bottom wall of the hidden groove. The hidden groove cover is provided with an outer cover, and one side of the outer cover is provided with hooks of the same number as the hook grooves, and the hooks can be clamped in the hook grooves of the side wall of the hidden groove, thereby stabilizing the position of the outer cover. One end of the bolt connecting the cover plate 440 and the first rotating shaft 210 is exposed on the bottom of the hidden groove, so that the bolt can be installed and removed easily. In addition, by providing the outer cover, the overall aesthetics can be improved.

[0035] A second rotating shaft 510 is installed at one end of the support handle 300 away from the first rotating shaft 210. The second rotating shaft 510 includes a lower rotating shaft and an upper rotating shaft. The lower rotating shaft is integrally formed with the support handle 300, and the upper rotating shaft is detachably mounted on the lower rotating shaft by bolts. An armrest seat 500 is rotatably mounted on the outer side of the second rotating shaft 510, and a slider 520 is slidably arranged on the top of the second rotating shaft 510. The slider 520 is in a square shape. A first slide groove 600 is provided in the middle of the armrest seat 500, and the second rotating shaft 510 passes through the first slide groove 600 and the armrest seat 500 in sequence. The middle part of the slider 520 is rotatably arranged in the second rotating shaft 510. Therefore, the armrest seat 500 can be rotated and slidably arranged relative to the axis of the second rotating shaft 510.

[0036] Second positioning posts 530 are symmetrically installed on both sides of the slider 520 and are slidably installed around the center of the second rotating shaft 510. A second elastic member 540 is installed between the two second positioning posts 530 and the slider 520. A plurality of second positioning holes 531 are evenly arranged around the outer periphery of the second rotating shaft 510, and the plurality of second positioning holes 531 are arranged around the outer periphery of the second rotating shaft 510. The elastic force of the second elastic member 540 can embed one end of the second positioning post 530 into one of the second positioning holes 531, thereby stabilizing the angular position of the slider 520 relative to the second rotating shaft 510, thereby stabilizing the angular position of the armrest seat 500 relative to the support handle 300. The second elastic member 540 can be a coil spring, and a mounting column with an axial overlap is arranged on a side surface where the slider 520 and the second positioning post 530 are close to each other, and the two ends of the coil spring are respectively sleeved on the corresponding mounting column, thereby improving the installation stability of the coil spring.

[0037] On both sides of the slider 520, third positioning posts 610 are slidably installed with respect to the center of the second rotating shaft 510, and third elastic members 630 are installed between the two third positioning posts 610 and the slider 520. A plurality of third positioning holes 620 are arranged side by side on both sides of the top of the armrest seat 500. The elastic force of the third elastic member 630 can extend one end of the third positioning post 610 out of the side wall of the slider 520 and embed it into the third positioning hole 620 on the corresponding side, thereby stabilizing the lateral position of the slider 520 relative to the support handle 300, thereby stabilizing the lateral position of the armrest seat 500 relative to the support handle 300. The third elastic member 630 can be a coil spring, and a mounting column with an axial overlap is arranged on a side surface where the slider 520 and the third positioning post 610 are close to each other, and the two ends of the coil spring are respectively sleeved on the corresponding mounting column, thereby improving the installation stability of the coil spring.

[0038] A first shielding cover 700 is provided for horizontal sliding at the bottom of the armrest seat 500, and a second slide groove 710 is provided in the first shielding cover 700. A second shielding cover 720 is provided for horizontal sliding at a side of the first shielding cover 700 close to the armrest seat 500, and a third slide groove 730 is provided in the second shielding cover 720. Specifically, the length of the second slide groove 710 is less than the length of the first slide groove 600, and the length of the third slide groove 730 is less than the length of the second slide groove 710. Thus, the first shielding cover 700 and the second shielding cover 720 can be used to shield the opening of the first slide groove 600, and at the same time, the required sliding distance of the first shielding cover 700 can be shortened as much as possible.

[0039] The top of the armrest seat 500 is also covered with an upper cover, and a soft bag is also provided outside the upper cover, so as to improve the touch of the armrest of the armrest seat 500.

[0040] The receiving groove provided at the top of the handgrip 100 runs through the handgrip 100, and the operating rod 800 is rotatably provided on both sides of the top of the receiving groove. Cylinders are provided on both sides of the top of the operating rod 800, and U-shaped grooves for embedding the cylinders are provided on both sides of the top of the receiving groove. When the base 200 and the handgrip 100 are fixedly installed, the base 200 covers the opening of the U-shaped groove, so that the position of the cylinder can be limited to stabilize the position of the operating rod 800. An extension rod 810 is slidably provided inside the receiving groove, and the height of the extension rod 810 is similar to the height of the handgrip 100. A plurality of fixing holes 820 are arranged side by side in the vertical direction on the upper half of the extension rod 810, and the fixing holes 820 are arranged horizontally. The height of the operating rod 800 is similar to half of the height of the handgrip 100, and a fixing block 830 is integrally formed on one side of the bottom of the operating rod 800, and the fixing block 830 is embedded in one of the fixing holes 820 in the horizontal direction. A lever 850 is integrally formed at the top of the operating rod 800 away from the fixed block 830, and a pressing block 840 is slidably arranged along the vertical direction at a position of the handgrip 100 near the lever 850, and a side of the pressing block 840 away from the lever 850 is exposed outside the handgrip 100, so that people can operate the pressing block 840. A bayonet is arranged at a side of the pressing block 840 near the lever 850, and the lever 850 is embedded in the bayonet.

[0041] A fourth elastic member 860 is installed between the top of the pressing block 840 and the bottom of the base 200. The fourth elastic member 860 can be a coil spring. The top of the pressing block 840 and the bottom of the base 200 are both provided with mounting columns with overlapping axes. One end of the coil spring is sleeved on the mounting column at the top of the pressing block 840, and the other end is sleeved on the mounting column at the bottom of the base 200, so that the position of the coil spring can be stabilized. The elastic force of the fourth elastic member 860 can push the pressing block 840 to the bottom position.

[0042] When the pressing block 840 is pressed upward, the elastic force of the fourth elastic member 860 can be overcome to push the pressing block 840 upward, thereby using the bayonet and the lever 850 to drive the operating rod 800 to rotate, so that the fixing block 830 can extend out of the fixing hole 820. At this time, the handgrip 100 can be pulled up and down relative to the extension rod 810, so that the height position of the handgrip 100 can be adjusted, that is, the height position of the armrest seat 500 can be adjusted to meet the different needs of the user for the handrest height. It should be noted that a mounting block is provided on one side of the bottom of the extension rod 810, and the mounting block is fixed to the side position of the office chair cushion, so that the bottom of the extension rod 810 can be fixed to the office chair cushion.

[0043] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An office chair armrest, characterized in that: include: Handlebars; A base, the base is mounted on the top of the handgrip, a first rotating shaft is arranged at the center of the top of the base, a plurality of first positioning holes are arranged around the top of the base, and a limiting column is arranged on the top of the base; A support handle, one end of the support handle is rotatably arranged on the top of the handgrip through the first rotating shaft, a positioning cylinder is arranged at the bottom of the support handle, a first positioning column is slidingly arranged in the positioning cylinder along the axial direction of the first rotating shaft, a first elastic member is installed in the positioning cylinder, the first elastic member provides elastic force to embed one end of the first positioning column into the first positioning hole, and an arc-shaped long cylinder is arranged at the bottom of the support handle for the limiting column to be embedded.

2. An office chair armrest according to claim 1, characterized in that: A positioning plate sleeved on the first rotating shaft is provided on the top of the base, the first positioning hole is opened on the top of the positioning plate, and the positioning plate is provided with a through hole for the limiting column to pass through.

3. An office chair armrest according to claim 2, characterized in that: A gap is arranged between the inner side of the positioning plate and the first rotating shaft, and a sleeve sleeved on the first rotating shaft is arranged at the bottom of the support handle, and the bottom of the sleeve is embedded in the gap.

4. An office chair armrest according to claim 3, characterized in that: A stepped groove is arranged on the top of the first rotating shaft, an inner ring matched with the stepped groove is arranged on the inner side of the sleeve, and a cover plate is installed on the top of the first rotating shaft, and the cover plate is pressed against the top of the inner ring.

5. The office chair armrest according to claim 4, characterized in that: A limiting ring sleeved on the first rotating shaft is arranged between the inner ring and the cover plate, a clamping block is arranged on the inner side of the limiting ring, and a clamping groove for the clamping block to be embedded is arranged on the outer side of the first rotating shaft.

6. The office chair armrest according to claim 1, characterized in that: A second rotating shaft is installed at the other end of the support handle, and an armrest seat is rotatably installed on the second rotating shaft. A slider rotatably connected to the second rotating shaft is installed in the armrest seat, and a second positioning column is arranged on the slider for transverse sliding. A plurality of second positioning holes are arranged on the outer circumference of the second rotating shaft, and a second elastic member is installed on the slider, and the second elastic member pushes the second positioning column to embed into the second positioning hole.

7. An office chair armrest according to claim 6, characterized in that: The armrest seat is provided with a first sliding groove for the rotating shaft to slide, the sliding block is arranged on the armrest seat for transverse sliding, the sliding block is arranged with a third positioning column for transverse sliding, a plurality of third positioning holes are arranged side by side on the side wall of the armrest seat, the sliding block is installed with a third elastic member, and the third elastic member pushes the third positioning column to embed into the third positioning hole.

8. An office chair armrest according to claim 7, characterized in that: A first shielding cover is slidably provided at the bottom of the armrest seat, the first shielding cover is provided with a second sliding groove for the sliding of the rotating shaft, the first shielding cover is slidably provided with a second shielding cover, the second shielding cover is provided with a third sliding groove for the sliding of the rotating shaft, and the lengths of the first sliding groove, the second sliding groove and the third sliding groove decrease successively.

9. The office chair armrest according to claim 1, characterized in that: An operating rod is rotatably provided at the top of the handrail, an extension rod is longitudinally slidably provided on the handrail, a plurality of fixing holes are longitudinally arranged side by side on the extension rod, a fixing block embedded in the fixing hole is provided at the bottom of the operating rod, a pressing block with one side protruding from the outer wall of the handrail is longitudinally slidably provided on the handrail, a shift rod is provided on the operating rod, the shift rod is plug-connected with the pressing block, a fourth elastic member is installed between the pressing block and the handrail, the fourth elastic member provides elastic force to keep the pressing block in the bottom position to push the operating rod to keep the fixing block embedded in the fixing hole.

10. An office chair armrest according to claim 9, characterized in that: The fourth elastic member is a coil spring, and two ends of the coil spring are respectively installed on the top of the pressing block and the bottom of the base.

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