A telescopic armrest and office chair

Abstract

The utility model belongs to the technical field of office chair handrail adjustment, specifically relates to a telescopic handrail and office chair, and the telescopic handrail includes connecting plate, support rod and handrail structure, the handrail structure includes the support seat of setting on the upper end of support rod, the handrail seat of sliding connection on support seat, and locking piece, the side of support seat away from support rod has the sliding portion, the sliding cavity of covering sliding portion is arranged in handrail seat, the length of sliding portion accounts for 1 / 3~1 / 2 of the length of sliding cavity, the locking piece includes the locking bevel gear of setting on the sliding portion, the mounting block of setting on the inner wall of sliding cavity, the locking block of eccentric rotation connection on mounting block, the end of locking block has the stop rotation bevel gear of overlapping with locking bevel gear to make the relative position of sliding cavity and sliding portion fixed. The utility model aims at improving the security of handrail, avoids the security risk of producing because of the knock of human body.

Description

Technical Field

[0001] This utility model belongs to the field of office chair armrest adjustment technology, specifically relating to a telescopic armrest and an office chair. Background Technology

[0002] Office chairs refer to various types of chairs provided for convenience in daily work and social activities. While office chairs bring convenience to people, the armrests of existing office chairs are fixed and cannot be adjusted. This makes it inconvenient for users to support their arms when changing sitting positions or when other users are using the chair, thus reducing its practicality.

[0003] Document CN222074863U discloses a multi-directional adjustment device for office chair armrests, comprising: a main seat plate, a fixed support mechanism, and an adjusting support mechanism. The fixed support mechanism is mounted on the main seat plate and includes a pair of main support armrests. Each pair of main support armrests is fixedly connected to a pair of connecting plates, and a sliding fixing block is slidably disposed within the main support armrest. The adjusting support mechanism is mounted on the sliding fixing block and includes an auxiliary support armrest. One end of the auxiliary support armrest is fixedly connected to a locking cylinder, and a support spring connects the locking cylinder to the sliding fixing block. This device allows for convenient length adjustment of the armrests, thereby meeting the needs of different users.

[0004] However, the device still has at least the following problems: when adjusting the length, the exposed track not only affects the aesthetics, but also makes it easy for the user's arm to bump directly into the track, posing a safety hazard. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide a telescopic armrest and office chair, in order to improve the safety of the armrest and avoid safety hazards caused by collisions with the human body.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A telescopic handrail includes a connecting plate, a support rod, and a handrail structure. The handrail structure includes a support base disposed at the upper end of the support rod, a handrail seat slidably connected to the support base, and a locking member. The support base has a sliding portion on the side away from the support rod, and the handrail seat has a sliding cavity covering the sliding portion. The length of the sliding portion is 1 / 3 to 1 / 2 of the length of the sliding cavity. The locking member includes locking helical teeth disposed on the sliding portion, a mounting block disposed on the inner wall of the sliding cavity, and a locking block eccentrically rotatably connected to the mounting block. The end of the locking block has anti-rotation helical teeth that engage with the locking helical teeth to fix the relative position of the sliding cavity and the sliding portion.

[0008] As a further preferred embodiment of the present invention, the mounting block is provided with a groove for accommodating the locking block; the locking block is provided with a rotating shaft rotatably connected to the groove near the anti-rotation helical tooth, and the end of the locking block away from the anti-rotation helical tooth is provided with an arc-shaped pressure plate that abuts against the groove wall of the groove, the arc-shaped pressure plate having a tendency to cause the anti-rotation helical tooth to move along a first rotation direction to approach the locking helical tooth.

[0009] As a further preferred embodiment of this utility model, it also includes a reset component; the reset component includes an extension plate disposed at the end of the locking block away from the anti-rotation helical tooth, a control channel disposed on the armrest seat and communicating with the sliding cavity, and a pressure rod disposed in the control channel with one end abutting against the extension plate and the other end protruding from the surface of the armrest seat; the pressure rod is slidably connected in the control channel and moves into the sliding cavity, so that the extension plate has the tendency to drive the anti-rotation helical tooth to move in the opposite direction of the first rotation direction away from the locking helical tooth.

[0010] As a further preferred embodiment of this invention, the end of the pressure rod away from the extension plate is rotatably connected with a ball bearing.

[0011] As a further preferred embodiment of the present invention, the pressure rod includes a main body section and a hinge section rotatably connected to the main body section; the armrest seat is provided with a receiving groove communicating with the control channel, and when the angle between the hinge section and the main body section is in the range of 70~90°, the hinge section is completely retracted into the receiving groove.

[0012] As a further preferred embodiment of this invention, a groove is provided at the side end of the receiving groove away from the control channel.

[0013] As a further preferred embodiment of the present invention, the reset member further includes a protrusion disposed on the surface of the extension plate near the locking helical tooth; when the anti-rotation helical tooth moves away from the locking helical tooth, the protrusion contacts the locking helical tooth.

[0014] As a further preferred embodiment of the present invention, the locking member further includes a support spring disposed between the groove wall of the groove body and the locking block; the support spring has a tendency to cause the anti-rotation helical tooth to move along a first rotation direction to approach the locking helical tooth.

[0015] As a further preferred embodiment of this utility model, the sliding cavity has protruding strips on two side walls that are opposite to the mounting block, and the ends of the two protruding strips are connected by limiting strips; the sliding part has two side slots that match the protruding strips.

[0016] As a further preferred embodiment of this utility model, the end of the pressure rod near the extension plate is provided with an arc-shaped protrusion.

[0017] This utility model also provides an office chair, including any of the above-mentioned telescopic armrests.

[0018] The beneficial effects of this utility model are:

[0019] The telescopic handrail provided by this utility model not only has the functions of unidirectional movement, multi-level locking, and reverse reset, but also adopts a fully enclosed structure with no exposed tracks or parts, which has the advantages of being aesthetically pleasing and highly safe. Attached Figure Description

[0020] Appendix Figure 1 This is a three-dimensional structural diagram of the telescopic handrail of this utility model.

[0021] Appendix Figure 2 This is a cross-sectional view of the handrail structure of this utility model from the main viewing angle.

[0022] Appendix Figure 3 Appendix to this utility model Figure 2 Partial schematic diagram A.

[0023] Appendix Figure 4 This is a cross-sectional view of the handrail structure of this utility model from a side perspective.

[0024] Appendix Figure 5 This is a schematic diagram of another state of the handrail structure of this utility model.

[0025] Attached diagram descriptions: 1. Connecting plate; 2. Support rod; 3. Handrail structure.

[0026] Support base 31, armrest base 32, locking component 33;

[0027] Receiving groove 32a, recess 32b;

[0028] Sliding part 311, side slot 3111;

[0029] Sliding cavity 321, protruding strip 3211, limiting strip 3212;

[0030] Locking helical tooth 331, mounting block 332, locking block 333, support spring 334;

[0031] Tank 3321;

[0032] Anti-rotation helical gear 3331, rotating shaft 3332, arc-shaped pressure plate 3333;

[0033] Extension plate 341, control channel 342, pressure rod 343, ball bearing 344, protrusion 345, arc-shaped protrusion 346;

[0034] Main body section 3421, articulated section 3422. Detailed Implementation

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] As attached Figure 1 ~Appendix Figure 5 As shown, this embodiment provides an office chair, mainly by structurally improving the armrests to combine aesthetics and practicality. The specific structure is as follows:

[0039] A telescopic armrest and office chair includes a connecting plate 1, a support rod 2, and an armrest structure 3; the armrest structure 3 includes a support base 31 disposed on the upper end of the support rod 2, an armrest seat 32 slidably connected to the support base 31, and a locking member 33.

[0040] In this embodiment, the support base 31 has a sliding part 311 on the side away from the support rod 2, and the armrest base 32 is provided with a sliding cavity 321 covering the sliding part 311. The length of the sliding part 311 accounts for 1 / 3 to 1 / 2 of the length of the sliding cavity 321.

[0041] The length of the sliding part 311 is preferably half the length of the sliding cavity 321. This is to ensure that the support seat 31 is always covered by the armrest seat 32 when the armrest seat 32 moves, so as to avoid the support seat 31 being exposed and thus causing accidental bumps.

[0042] As a preferred embodiment, the specific structure for achieving the sliding connection between the support base 31 and the armrest seat 32 can be as follows: The sliding cavity 321 has two protruding strips 3211 on its two opposite side walls, which are different from the mounting block 332. The ends of the two protruding strips 3211 are connected by limiting strips 3212. The sliding part 311 has two side slots 3111 that match the protruding strips 3211. The sliding connection between the side slots 3111 and the protruding strips 3211 allows the armrest seat 32 to slide smoothly on the support base 31. To further improve smoothness, common resistance-reducing structures such as ball bearings can be added. Only one limiting strip 3212 is needed, preferably located at the rear end of the protruding strip 3211, near the backrest, to prevent the armrest seat 32 from detaching from the support base 31.

[0043] In a preferred embodiment, the locking member 33 includes locking helical teeth 331 disposed on the sliding portion 311, mounting block 332 disposed on the inner wall of the sliding cavity 321, and locking block 333 eccentrically rotatably connected to mounting block 332; the end of the locking block 333 has anti-rotation helical teeth 3331 that engage with the locking helical teeth 331 to fix the relative position of the sliding cavity 321 and the sliding portion 311. The locking helical teeth 331 are composed of multiple spaced protrusions and recesses, and the shape of the anti-rotation helical teeth 3331 matches the recesses; the recesses include a gentle slope, a bottom edge, and a steep slope, the angle between the steep slope and the bottom edge is close to 90 degrees, while the angle between the gentle slope and the bottom edge is generally in the range of 30-45 degrees, and the steep slope is closer to the rear end of the protrusion 3211, i.e., closer to the backrest. The purpose of this design is that after the anti-rotation helical tooth 3331 enters the recess, it is easier for the anti-rotation helical tooth 3331 to pass through the gentle slope but difficult to pass through the steep slope, so that the armrest seat 32 has the functions of unidirectional movement and multi-level locking.

[0044] Furthermore, the mounting block 332 is provided with a groove 3321 for accommodating the locking block 333; the locking block 333 is provided with a rotating shaft 3332 rotatably connected to the groove 3321 near the anti-rotation helical tooth 3331, and the end of the locking block 333 away from the anti-rotation helical tooth 3331 is provided with an arc-shaped pressure plate 3333 that abuts against the groove wall of the groove 3321. The arc-shaped pressure plate 3333 has a tendency to cause the anti-rotation helical tooth 3331 to move along a first rotation direction to approach the locking helical tooth 331. The distribution of the rotating shaft 3332 close to the anti-rotation helical tooth 3331 and away from the arc-shaped pressure plate 3333 results in a longer distance between the arc-shaped pressure plate 3333 and the rotating shaft 3332, so that a small force can be applied to the arc-shaped pressure plate 3333 to make the anti-rotation helical tooth 3331 rotate. The specific application is as follows: When the anti-rotation helical tooth 3331 is moved by the mounting block 332, the anti-rotation helical tooth 3331 contacts the gentle slope and moves out of the recess from the gentle slope. The rotation of the anti-rotation helical tooth 3331 increases the force between the arc-shaped pressure plate 3333 and the groove wall of the groove 3321. At this time, the arc-shaped pressure plate 3333 deforms. When the anti-rotation helical tooth 3331 moves further into the recess, the arc-shaped pressure plate 3333 is reset. The force generated drives the anti-rotation helical tooth 3331 to rotate and press against the recess, preventing the anti-rotation helical tooth 3331 from easily falling out of the recess.

[0045] Furthermore, in order to enhance the force driving the anti-rotation helical tooth 3331 to rotate, the following structure can be added: the locking member 33 further includes a support spring 334 disposed between the groove wall of the groove body 3321 and the locking block 333; the support spring 334 has a tendency to cause the anti-rotation helical tooth 3331 to move along a first rotation direction to approach the locking helical tooth 331.

[0046] In this embodiment, a reset component is also included; the reset component includes an extension plate 341 disposed at the end of the locking block 333 away from the anti-rotation helical tooth 3331, a control channel 342 disposed on the armrest seat 32 and communicating with the sliding cavity 321, and a pressure rod 343 disposed in the control channel 342 with one end abutting against the extension plate 341 and the other end protruding from the surface of the armrest seat 32; the pressure rod 343 is slidably connected in the control channel 342 and moves into the sliding cavity 321, so that the extension plate 341 has the tendency to drive the anti-rotation helical tooth 3331 to move in the opposite direction of the first rotation direction away from the locking helical tooth 331. It is worth noting that when the anti-rotation helical tooth 3331 is located within the recess, the arc-shaped pressure plate 3333 contacts the groove wall of the groove 3321, but the pressure between them is relatively small. At this time, the end of the pressure rod 343 away from the extension plate 341 protrudes from the surface of the armrest seat 32. When the pressure rod 343 is pressed down, the extension plate 341 drives the anti-rotation helical tooth 3331 to move in the opposite direction of the first rotation until it disengages from the recess. At this time, the pressure between the arc-shaped pressure plate 3333 and the groove wall of the groove 3321 increases, and the anti-rotation helical tooth 3331, having disengaged from the recess, can slide back and forth without obstruction, especially backward. Therefore, the pressure rod 343 is generally used when the armrest seat 32 needs to be reset backward after moving to the foremost position. Furthermore, a reinforcing part is provided between the extension plate 341 and the locking block 333 to enhance the structural strength and deformation resistance of the extension plate 341.

[0047] As a further preferred embodiment, the end of the pressure rod 343 away from the extension plate 341 is rotatably connected to a ball bearing 344. This arrangement makes the part protruding from the surface of the armrest seat 32 comfortable to contact with the human body, and may even have an entertainment or massage effect.

[0048] As a further preferred embodiment, the pressure rod 343 includes a main body section 3421 and a hinge section 3422 rotatably connected to the main body section 3421; the armrest seat 32 is provided with a receiving groove 32a communicating with the control channel 342. When the angle between the hinge section 3422 and the main body section 3421 is within the range of 70° to 90°, the hinge section 3422 is completely retracted into the receiving groove 32a. Furthermore, a groove 32b is provided on the side of the receiving groove 32a away from the control channel 342. This arrangement allows the pressure rod 343 to be housed within the armrest seat 32, preventing the pressure rod 343 from protruding from the armrest seat 32 and causing interference when not in use.

[0049] As a further preferred embodiment, the reset member further includes a protrusion 345 disposed on the surface of the extension plate 341 near the locking helical tooth 331; when the anti-rotation helical tooth 3331 moves away from the locking helical tooth 331, the protrusion 345 contacts the locking helical tooth 331. The advantage of this arrangement is that when the anti-rotation helical tooth 3331 is not in contact with the locking helical tooth 331, the protrusion 345 emits a series of sounds by making pressure contact with the locking helical tooth 331, thus serving both a lifting and decompression function. To reduce wear and improve the pleasantness of the sound, the protrusion 345 can be made of metal and be arc-shaped.

[0050] As a further preferred embodiment, the end of the pressure rod 343 near the extension plate 341 is provided with an arc-shaped protrusion 346. The purpose of this provision is to reduce the wear between the pressure rod 343 and the extension plate 341. The arc-shaped protrusion 346 can be made of common materials such as rubber.

[0051] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

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