Armrests and office chairs

Abstract

The utility model relates to handrails and office chair, including support arm and hand rest subassembly, the hand rest subassembly includes base and sliding surface cover, the base fixed mounting in the top of support arm, the sliding surface cover is along length direction and is opened with the slide groove, the slide groove is provided with the limit guide block, the bottom of limit guide block passes through the slide groove with base fixed connection, the sliding surface cover passes through the slide groove along limit guide block relative to the base sliding, limit guide block is used for limiting the sliding travel of sliding surface cover, the lateral wall of limit guide block is provided with elastic convex part, the inner wall of slide groove corresponds elastic convex part's position and is along length direction interval and is provided with a plurality of first positioning recess, the sliding surface cover in the sliding process, elastic convex part is configured to be inserted or separated from first positioning recess, realizes the front and back sliding adjustment of handrail surface cover.

Description

Technical Field

[0001] This utility model relates to armrests and office chairs. Background Technology

[0002] Existing chair armrests typically consist of a support arm and a handrest fixed at the top. However, the position of the cover of this traditional handrest assembly is relatively fixed and cannot be flexibly adjusted according to the user's sitting posture or distance from the desktop. As a result, when users are working, typing, or performing other operations, the handrest often cannot extend to a suitable position to provide effective support because the body is leaning forward or the arm is extended. This leaves the arm in a suspended state for a long time, which can easily cause limb pain and fatigue and fails to meet users' needs for ergonomic comfort and multi-scenario use. Utility Model Content

[0003] The primary objective of this invention is to provide an adjustable handrail.

[0004] The second objective of this invention is to provide an office chair with adjustable armrests.

[0005] The primary objective of this invention is achieved as follows: A handrail includes a support arm and a hand support assembly, characterized in that: the hand support assembly includes a base and a sliding cover; the base is fixedly installed on the top end of the support arm; the sliding cover has a groove along its length; a limiting guide block is provided in the groove; the bottom of the limiting guide block passes through the groove and is fixedly connected to the base; the sliding cover slides relative to the base along the limiting guide block via the groove; the limiting guide block is used to limit the sliding stroke of the sliding cover; the side wall of the limiting guide block is provided with an elastic protrusion; the inner wall of the groove is provided with a plurality of first positioning grooves spaced along its length corresponding to the position of the elastic protrusion; during the sliding process, the elastic protrusion is configured to engage or disengage from the first positioning groove.

[0006] By setting a base and sliding cover at the top of the support arm and using a limiting guide block fixed to the base through the slide groove to limit the travel of the sliding cover, and with the locking action of the elastic protrusion and the multi-stage first positioning groove, not only can the back and forth sliding adjustment of the armrest cover be realized, solving the problem of fatigue caused by the arm being suspended in the air in the prior art, but also the elastic positioning mechanism provides a clear sense of adjustment and a stable support force, preventing the cover from accidentally sliding when under force, thus improving the flexibility and comfort of use.

[0007] The primary objective of this utility model can also be achieved by the following technical measures: Furthermore, the bottom of the slide groove is connected to a first opening, the length of the first opening is the same as the length of the slide groove and the width is less than the width of the slide groove, thereby forming a stepped surface in the slide groove; the width of the limiting guide block is greater than the width of the first opening and abuts against the stepped surface; the base is provided with a connecting post, the connecting post passes through the first opening and is locked and fixed with the limiting guide block.

[0008] The stepped surface design at the bottom of the slide groove, combined with the limiting guide block, forms an anti-detachment structure, effectively limiting the vertical freedom of the sliding cover and ensuring that the cover will not separate from the base.

[0009] Furthermore, the slide groove has guide ribs protruding along the length direction on both sides of the first opening, and the limiting guide block has a guide groove corresponding to the position of the guide ribs, and the guide ribs are slidably engaged in the guide grooves.

[0010] The precise positioning of the guide ribs and guide grooves eliminates the left-right swaying or tilting of the sliding cover during movement, making the adjustment process smooth and stable, and extending the service life of the components.

[0011] Furthermore, the base includes a bottom shell and a cover plate, the cover plate covers and is fixed on the bottom shell, and the cover plate and the bottom shell enclose a receiving cavity, and the connecting column is integrally formed on the cover plate.

[0012] The design employs a technique where the bottom shell and cover plate enclose a hollow cavity, thus providing ample internal wiring and storage space for the subsequent integration of wire-controlled cables, electronic circuits, and locking mechanisms. This provides a fundamental structural guarantee for achieving integrated handrail functions and a clean appearance, and solves the technical problem that existing handrail bases are mostly solid or simple structures, which cannot provide concealed installation space for internal functional components.

[0013] Furthermore, it also includes a paddle and a control cable. The side wall of the bottom shell has a paddle mounting port, and the paddle is rotatably mounted at the paddle mounting port via a rotating shaft. The bottom of the bottom shell has a cable hole, and the support arm is a hollow support arm with a cable outlet at its lower end. One end of the control cable is connected to the paddle, and the other end of the control cable passes through the cable hole, the hollow cavity of the support arm, and the cable outlet, for connecting to the locking and releasing component of the chair back tilt adjustment mechanism or its control end.

[0014] The chair adopts a fully concealed wiring technology that integrates a paddle on the side of the bottom shell and uses a hollow support arm to construct an internal channel, allowing the cable to pass through the base cavity, the support arm cavity, and the chair floor. This technology enables convenient adjustment of the backrest angle without taking your hands off the armrests, while eliminating exposed wiring and solving the technical problem of existing office chairs where the adjustment cables are directly exposed on the outside of the chair, resulting in a cluttered appearance and easy snagging and entanglement with surrounding objects.

[0015] Furthermore, it also includes a button, a wire, and a micro switch. The side wall of the support arm has a button hole, the micro switch is built into the support arm, the button is movably disposed in the button hole, and the button is used to trigger the micro switch. One end of the wire is connected to the micro switch, and the other end of the wire passes through the wire outlet hole of the support arm and is used to connect to the control module of the electric lifting drive device that controls the lifting of the seat cushion.

[0016] The design employs a technique that embeds buttons and microswitches into the side wall of the support arm and utilizes the hollow cavity of the support arm as a concealed channel for the wiring. This completely encloses the wiring connecting the electric push rod inside the armrest, achieving "invisible" integration of the electronic control system. This solves the technical problem of exposed control wires in existing electric office chairs being prone to aging and damage, and also compromising the overall aesthetic appearance.

[0017] Furthermore, a polyurethane pad is fixedly provided on the top of the sliding cover, and the polyurethane pad completely covers the upper surface of the sliding cover.

[0018] The technology employs a technique of fixing a full-coverage polyurethane (PU) soft pad on the top of the sliding cover; thereby utilizing the excellent elasticity and skin-friendly properties of PU material to provide a soft cushioning layer for the arm, effectively dispersing elbow pressure, and solving the technical problem that existing armrest covers are mostly made of hard plastic, which causes elbow pain and a hard feel when leaning on them for a long time.

[0019] Furthermore, the side wall of the limiting guide block is provided with a blind mounting hole, and the elastic protrusion includes a compression spring and a positioning ball; the compression spring is housed in the blind mounting hole, and the positioning ball is disposed at the end of the compression spring away from the bottom of the blind hole; the compression spring is in a compressed state and pushes against the positioning ball outward, so that part of the spherical part of the positioning ball protrudes out of the opening of the blind mounting hole; the first positioning groove is an arc-shaped groove adapted to the spherical curvature of the positioning ball.

[0020] It adopts a structure that combines spring-driven positioning ball bearings with an arc-shaped first positioning groove, transforming sliding friction into rolling friction. This results in a crisper and smoother feel when shifting gears, while significantly reducing mechanical wear. It solves the technical problems of high friction, stiff adjustment, and easy wear and failure after prolonged use that exist in traditional plastic elastic arm positioning methods.

[0021] The second objective of this utility model is achieved as follows: An office chair includes a backrest, a seat cushion, a base assembly, a headrest, and armrests. The seat cushion is mounted on the base assembly, the backrest is connected to the seat cushion, the armrests are respectively mounted on both sides of the seat cushion via support arms, and the headrest is mounted on the top of the backrest. The backrest, seat cushion, and armrests together form a seating space. The base assembly integrates a backrest tilt adjustment mechanism and an electric lifting drive device.

[0022] The office chair, by integrating the aforementioned multi-functional adjustable armrests, combined with the backrest tilt adjustment mechanism and electric lifting drive, not only solves the problem of users' arms dangling in the air, but also achieves convenient "hands-without-taking-armrest" control for adjusting posture, thus improving the overall comfort of the chair.

[0023] The beneficial effects of this utility model are as follows: This utility model, by setting a base and a sliding cover cooperation structure at the top of the support arm, uses a limiting guide block fixed on the base through the slide groove to limit the travel of the sliding cover. With the locking action of the elastic protrusion and the multi-level first positioning groove, it not only realizes the front and back sliding adjustment of the armrest cover, but also provides a clear sense of adjustment level and stable support through the elastic positioning mechanism, preventing the cover from accidentally sliding under force, and significantly improving the flexibility and comfort of use.

[0024] This utility model adopts an invisible wiring layout, utilizing the internal space of the armrest to construct a closed channel, completely concealing the mechanical cables that control the tilt of the chair back and the electronic circuits that control the lifting and lowering of the seat cushion. This design solves the technical problems of messiness, easy tangling, and aging and damage caused by traditional exposed pipelines. While ensuring that users can conveniently operate the functions of the entire chair without taking their hands off the armrest, it also improves the visual cleanliness of the product. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the chair back.

[0026] Figure 2 This is the assembly drawing for the chair back.

[0027] Figure 3 This is an assembly drawing of the support frame and the limiting sleeve.

[0028] Figure 4 This is an assembly drawing of the lumbar support plate and support frame.

[0029] Figure 5 This is an assembly drawing of the lumbar support plate and support frame from another angle.

[0030] Figure 6 This is a diagram of an office chair.

[0031] Figure 7 This is a diagram of an office chair (headrest raised).

[0032] Figure 8 This is a schematic diagram of a handrail.

[0033] Figure 9 This is a schematic diagram of the handrail from another angle.

[0034] Figure 10 This is an assembly drawing of the sliding cover and the base.

[0035] Figure 11 This is an assembly drawing of the sliding cover, the limiting guide block, and the base.

[0036] Figure 12 This is an assembly drawing of the sliding cover, limiting guide block, bottom shell, and cover plate.

[0037] Figure 13 This is an exploded view of the handrail.

[0038] Figure 14 This is a schematic diagram of the armrest (with the sliding cover moved back).

[0039] Figure 15 This is a schematic diagram of a headrest.

[0040] Figure 16 This is a cross-sectional view of the headrest.

[0041] Figure 17 This is an assembly diagram of the headrest.

[0042] Figure 18 This is an assembly drawing of the clamping components.

[0043] Figure 19 This is an assembly diagram of the clamping assembly from another angle.

[0044] Figure 20 This is a left view of the office chair.

[0045] Figure 21 This is a left view of the office chair (headrest rotated). Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments: Implementation examples, in conjunction with Figures 1 to 21As shown, an office chair includes a backrest 1, a seat cushion 10, a base assembly 20, armrests 2, and a headrest 3. The seat cushion 10 is mounted on the base assembly 20, the backrest 1 is connected to the seat cushion 10, the headrest 3 is mounted on the top of the backrest 1, and the armrests 2 are respectively mounted on both sides of the seat cushion 10. The base assembly 20 is provided with a backrest tilt adjustment mechanism and an electric lifting drive device for raising and lowering the seat cushion 10.

[0047] The chair back tilt adjustment mechanism is used to adjust the tilt angle of the chair back 1 relative to the seat cushion 10; the electric lifting drive device is used to adjust the height of the seat cushion 10. The chair back tilt adjustment mechanism and the electric lifting drive device can be implemented using common structures in the art, and this embodiment does not limit their specific structural form, as long as they can achieve the corresponding functions. To facilitate tilt adjustment, the chair back 1 and the seat cushion 10 can be rotatably connected.

[0048] To facilitate the tilt adjustment of the chair back 1 and the height adjustment of the seat cushion 10, this embodiment includes a control and transmission structure inside the armrest 2, allowing the user to perform the corresponding operations while seated.

[0049] In one embodiment, the chair back 1 includes a chair back frame 11, a lumbar support assembly 12, and a first elastic member 13. The chair back frame 11 is provided with a mounting cavity 111, and a mounting post 112 is fixedly disposed in the mounting cavity 111.

[0050] The lumbar support assembly 12 includes a lumbar support plate 121, a support frame 122, and a limiting sleeve 123. The lumbar support plate 121 is rotatably connected to the head of the support frame 122. The support frame 122 has a sliding channel 124 along its length, and a first limiting part 125 is provided on the inner wall of the sliding channel 124 near one end. The limiting sleeve 123 has a hollow structure, and a second limiting part 126 is provided at its top end. The second limiting part 126 is used to cooperate with the first limiting part 125 to achieve stroke limitation.

[0051] During assembly, the tail of the support frame 122 extends into the mounting cavity 111; the limiting sleeve 123 passes through the sliding channel 124 and is sleeved and fixed on the mounting post 112, allowing the support frame 122 to slide axially relative to the limiting sleeve 123. The first elastic element 13 is sleeved on the limiting sleeve 123, with one end of the first elastic element 13 abutting against the inner wall of the mounting cavity 111 and the other end abutting against the support frame 122, thereby causing the first elastic element 13 to exert an outward pushing force on the support frame 122 until the second limiting part 126 and the first limiting part 125 abut against each other, so as to realize the outward extension and stroke limitation of the lumbar support assembly 12.

[0052] To limit the movement path of the lumbar support assembly 12 and improve sliding stability, guide holes 1221 are opened at intervals along the length direction on the support frame 122, and guide posts 1111 are set at corresponding intervals in the mounting cavity 111. The guide posts 1111 are inserted into the guide holes 1221, thereby guiding the movement direction of the lumbar support assembly 12 and limiting the sway.

[0053] To achieve a rotatable connection between the lumbar support plate 121 and the support frame 122, a connecting cavity 1222 is provided on the back of the lumbar support plate 121. The size of the connecting cavity 1222 is larger than the size of the head of the support frame 122. During assembly, the head of the support frame 122 is inserted into the connecting cavity 1222, and the pivot passes through the connecting cavity 1222 and the head of the support frame 122, thus forming a rotatable connection between the lumbar support plate 121 and the support frame 122. The inner wall of the connecting cavity 1222 is used to limit the rotation angle of the lumbar support plate 121 to avoid excessive rotation that could lead to instability in the support or structural interference.

[0054] To ensure that the lumbar support 121 maintains an outward tilted support posture towards the seating space under no external force or light load conditions, at least two second elastic members 1223 are provided at the top of the head of the support frame 122, and the lumbar support 121 has an abutment portion 1211 at the corresponding position. Under the action of its elastic force, the second elastic members 1223 continuously push against the abutment portion 1211 until the head of the support frame 122 abuts against the inner wall of the connecting cavity 1222, thereby keeping the lumbar support 121 in an outward tilted state and improving the fit and support effect.

[0055] The lumbar support 121 can be a flexible curved panel, which is concave to the side of the user; the two sides of the lumbar support 121 extend forward to form a wrap-around part, which is used to provide wrap-around support for the human waist to improve lateral support and comfort.

[0056] In terms of the working process: when the user applies force to the lumbar support plate 121, the lumbar support plate 121 can rotate adaptively relative to the support frame 122 at the pivot point; at the same time, the support frame 122 can generate a certain stroke of axial elastic displacement under the action of the first elastic element 13, and rebound to its original position after the external force decreases, thereby achieving adaptive support for different body shapes and sitting postures.

[0057] In one embodiment, the armrest 2 includes a support arm 21 and a hand support assembly 4. The hand support assembly 4 includes a base 41 and a sliding cover 42. The base 41 is fixedly mounted on the top end of the support arm 21; the sliding cover 42 has a groove 421 along its length, and a limiting guide block 5 is provided in the groove 421. The limiting guide block 5 passes through the groove 421 and is fixedly connected to the base 41, thereby allowing the sliding cover 42 to slide and adjust relative to the base 41 along its length. The limiting guide block 5 is used to limit the sliding stroke of the sliding cover 42, where the length direction is along the front-back direction of the armrest 2 (i.e., the sliding direction of the sliding cover 42).

[0058] To achieve sliding positioning, the sidewall of the limiting guide block 5 is provided with an elastic protrusion 51, and the inner wall of the slide groove 421 is provided with a plurality of first positioning grooves 52 at intervals along the length direction. During the sliding process of the sliding cover 42, the elastic protrusion 51 can selectively engage or disengage between the first positioning grooves 52 to achieve segmented positioning and tactile feedback.

[0059] To improve assembly reliability, a first opening 422 is provided at the bottom of the slide groove 421. The length of the first opening 422 is the same as the length of the slide groove 421, but its width is less than the width of the slide groove 421, thus forming a stepped surface 423 within the slide groove 421. The width of the limiting guide block 5 is greater than the width of the first opening 422 and abuts against the stepped surface 423. A connecting post 413 is provided on the base 41. The connecting post 413 passes through the first opening 422 and is locked and fixed to the limiting guide block 5, thereby achieving a reliable connection between the limiting guide block 5 and the base 41 and ensuring the stable sliding of the sliding cover 42.

[0060] To improve guiding accuracy, guide ribs are provided along the length direction on the side walls of the slide groove 421 on both sides of the first opening 422, and guide grooves are provided at the corresponding positions of the limiting guide block 5. The guide ribs slide and fit in the guide grooves to suppress the left and right shaking of the sliding cover 42.

[0061] The base 41 may include a bottom shell 411 and a cover plate 412. The cover plate 412 covers and is fixed on the bottom shell 411, and the cover plate 412 and the bottom shell 411 enclose a receiving cavity. The connecting column 413 may be integrally formed on the cover plate 412 to reduce the number of parts and improve assembly consistency.

[0062] To enable the tilt adjustment of the chair back 1, the handrest assembly 4 also includes a paddle 43 and a control cable. A paddle mounting port 431 is provided on the side wall of the bottom shell 411, and the paddle 43 is rotatably mounted at the paddle mounting port 431 via a pivot. A cable passage hole 432 is provided at the bottom of the bottom shell 411. The support arm 21 has a hollow structure, with a cable outlet hole 433 at its lower end. One end of the control cable is connected to the paddle 43, and the other end passes sequentially through the cable passage hole 432, the hollow cavity of the support arm 21, and the cable outlet hole 433, and is connected to the locking and releasing component of the chair back tilt adjustment mechanism or its control end. When the paddle 43 rotates, it drives the control cable to pull or return, thereby driving the chair back tilt adjustment mechanism to unlock or lock, thus achieving the tilt adjustment of the chair back 1.

[0063] To enable seat cushion lifting control, a button hole 211 is provided on the side wall of the support arm 21. A micro switch is built into the support arm 21, and a button 212 is movably set in the button hole 211 and used to trigger the micro switch. One end of the wire is connected to the micro switch, and the other end passes through the wire outlet hole 433 of the support arm 21 and is electrically connected to the control module of the electric lifting drive device to realize seat cushion lifting operation.

[0064] To enhance tactile feel and comfort, a polyurethane pad 44 can be fixedly mounted on the top of the sliding cover 42, covering the upper surface of the sliding cover 42.

[0065] In other embodiments, the elastic protrusion 51 may adopt a "compression spring and positioning ball" structure: a blind hole is formed on the side wall of the limiting guide block 5, the compression spring is housed in the blind hole, and the positioning ball is located at the end of the compression spring away from the bottom of the blind hole; the compression spring is in a compressed state and pushes against the positioning ball outward, so that a portion of the spherical surface of the positioning ball protrudes from the opening of the blind hole. The first positioning groove 52 is set as an arc-shaped groove that matches the curvature of the spherical surface of the positioning ball to improve positioning stability and reduce wear.

[0066] In one embodiment, the headrest 3 includes a clamping assembly 6 and a headrest assembly 7. The clamping assembly 6 is used to fix it to the backrest 1, and the headrest assembly 7 is used to realize height adjustment and angle adjustment.

[0067] The clamping assembly 6 includes a front housing 61 and a rear housing 62 connected to each other, and the front housing 61 and the rear housing 62 enclose each other to form a vertical guide channel 63; a plurality of second positioning grooves 611 are provided vertically at intervals on the side of the front housing 61 facing the guide channel 63.

[0068] The headrest assembly 7 includes a lifting bracket 71 and a headrest body 72. The lifting bracket 71 is sleeved on the outside of the clamping assembly 6, and a positioning core plate 73 is fixedly installed in the middle of the inner cavity of the lifting bracket 71. The positioning core plate 73 is inserted into the guide channel 63 and can slide up and down along the guide channel 63, thereby realizing the height adjustment of the headrest 3. The headrest body 72 is rotatably connected to the lifting bracket 71 through a rotating shaft to realize the headrest angle adjustment.

[0069] To achieve height-level positioning, an elastic positioning element 731 is provided on the positioning core plate 73. The elastic end of the elastic positioning element 731 is used to abut against and engage with the second positioning groove 611, thereby realizing the lifting adjustment and level positioning of the headrest assembly 7 relative to the clamping assembly 6.

[0070] The clamping assembly 6 may also include a lower pressure plate 64, which is connected to the bottom of the rear housing 62 and extends forward to form a lower clamping part 641; the top of the front housing 61 extends forward to form an upper clamping part 612, and the upper clamping part 612 and the lower clamping part 641 cooperate to form a C-shaped clamping space 613 for clamping the chair back 1.

[0071] In other embodiments, the upper clamping part 612 and the lower clamping part 641 can clamp and fix the chair back 1 by means of screw locking, snap-fit ​​engagement or elastic clamping, so that the headrest 3 can be quickly assembled on the top area of ​​the chair back 1.

[0072] To limit the rotation range of the headrest body 72, a rotation groove is provided on the top of the lifting bracket 71. The headrest body 72 may include a connecting seat 8 and a headrest frame 9. The lower part of the connecting seat 8 is rotatably mounted in the rotation groove via a damping shaft. The front end of the connecting seat 8 is fixedly connected to the headrest frame 9, and the rear end of the connecting seat 8 extends to form a limiting baffle 81. When the headrest body 72 rotates to its limit angle, the limiting baffle 81 abuts against the top surface of the lifting bracket 71 to limit the rotation angle of the headrest body 72 and improve safety during use.

[0073] In other embodiments, the elastic positioning member 731 may adopt an elastic spring sheet structure: the positioning core plate 73 has an installation groove on its surface, and the elastic spring sheet is fixedly installed in the installation groove; the elastic spring sheet protrudes a positioning protrusion on the side facing the front housing 61, and the positioning protrusion pushes outward and is inserted into the second positioning groove 611 under the elastic force of the elastic spring sheet itself, so as to achieve height positioning and anti-retraction.

[0074] To limit left and right swaying during the lifting process, the side wall of the guide channel 63 is provided with a vertical guide groove, and the positioning core plate 73 is provided with a guide slider at the corresponding position. The guide slider slides and engages in the guide groove, thereby improving the lifting stability of the headrest 3.

[0075] The headrest 9 can be an arc-shaped frame with an elastic mesh fabric stretched on it. The elastic mesh fabric and the arc-shaped frame form a breathable headrest support surface to improve heat dissipation and comfort.

[0076] The user places the office chair on a level surface and sits on the seat cushion 10, then adjusts and uses it as follows: Seat height adjustment: The user presses the button located on the side wall of the support arm 21. The button triggers the micro switch inside the support arm 21. The micro switch sends a control signal to the control module of the electric lifting drive device via a wire, thereby driving the electric lifting drive device to move and raise or lower the seat 10. When the seat height reaches the desired position, the button is released to stop the adjustment.

[0077] Backrest 1 tilt angle adjustment: The user moves the lever 43 on the handrest assembly 4. The lever 43 rotates and drives the control cable to pull or return, thereby driving the locking and releasing component of the backrest tilt adjustment mechanism to unlock or lock. In the unlocked state, the user applies force with their back to rotate the backrest 1 relative to the seat cushion 10 to the target tilt angle, and then resets the lever 43 to lock the backrest tilt adjustment mechanism, thereby realizing the adjustment and maintenance of the backrest 1 tilt angle.

[0078] The lumbar support assembly 12 provides adaptive support: When the user's back and waist contact the lumbar support plate 121 in a seated position, the lumbar support plate 121 can adaptively rotate around the pivot relative to the support frame 122; the support frame 122 can generate axial elastic displacement under the action of the first elastic element 13 and rebound to its original position after the external force decreases, so that the lumbar support assembly 12 provides continuous support and rebound for different body shapes and sitting posture changes. The wrap-around portions on both sides of the lumbar support plate 121 provide wrap-around support for the waist to improve lateral support stability and comfort.

[0079] Handrail 2 hand support position adjustment: The user pushes the sliding cover 42 along the length of the handrail 2, so that the sliding cover 42 slides relative to the base 41; during the sliding process, the elastic protrusion 51 on the side wall of the limiting guide block 5 selectively engages or disengages between each first positioning groove 52, thereby achieving segmented positioning; when the sliding cover 42 reaches the appropriate position, the positioning is maintained by the cooperation of the elastic protrusion 51 and the corresponding first positioning groove 52.

[0080] Headrest 3 height and angle adjustment: The user applies a vertical adjustment force to the headrest assembly 7, causing the positioning core plate 73 to slide up and down along the guide channel 63; the positioning end of the elastic positioning member 731 selectively engages between the second positioning grooves 611, realizing the graded adjustment and positioning of the headrest 3 height. The user can also rotate the headrest body 72 around the pivot to adjust the headrest angle. When the headrest body 72 rotates to the limit angle, the limit baffle 81 and the lifting bracket 71 cooperate to limit its rotation range to avoid excessive rotation.

[0081] Through the above adjustments and usage process, the office chair can achieve adjustable and adaptive support in terms of seat height, backrest 1 tilt, lumbar support component 12 support, armrest 2 position, and headrest 3 height / angle, so as to meet the comfort needs of different users and different working conditions.

Claims

1. A handrail, comprising a support arm and a hand support assembly, characterized in that: The hand support assembly includes a base and a sliding cover. The base is fixedly installed on the top of the support arm. The sliding cover has a groove along its length. A limiting guide block is provided in the groove. The bottom of the limiting guide block passes through the groove and is fixedly connected to the base. The sliding cover slides relative to the base along the limiting guide block through the groove. The limiting guide block is used to limit the sliding stroke of the sliding cover. The side wall of the limiting guide block is provided with an elastic protrusion. The inner wall of the groove is provided with a plurality of first positioning grooves at intervals along its length corresponding to the position of the elastic protrusion. During the sliding process, the elastic protrusion is configured to engage or disengage from the first positioning groove. The bottom of the slide is connected to a first opening, the length of which is the same as the length of the slide and the width of which is less than the width of the slide, thereby forming a stepped surface in the slide; the width of the limiting guide block is greater than the width of the first opening and abuts against the stepped surface; the base is provided with a connecting post, which passes through the first opening and is locked and fixed to the limiting guide block; The slide groove is provided with guide ribs protruding along the length direction on both sides of the first opening. The limiting guide block is provided with a guide groove corresponding to the position of the guide ribs. The guide ribs are slidably engaged in the guide grooves. The base includes a bottom shell and a cover plate. The cover plate covers and is fixed on the bottom shell. The cover plate and the bottom shell enclose a receiving cavity. The connecting column is integrally formed on the cover plate. It also includes a paddle and a control cable. The side wall of the bottom shell has a paddle mounting port, and the paddle is rotatably mounted at the paddle mounting port via a rotating shaft. The bottom of the bottom shell has a cable hole. The support arm is a hollow support arm, and the lower end of the support arm has a cable outlet hole. One end of the control cable is connected to the paddle, and the other end of the control cable passes through the cable hole, the hollow inner cavity of the support arm, and the cable outlet hole, for connecting to the locking and releasing component of the chair back tilt adjustment mechanism or its control end.

2. The handrail according to claim 1, characterized in that: It also includes a button, a wire, and a micro switch. The side wall of the support arm has a button hole, the micro switch is built into the support arm, the button is movably disposed in the button hole, and the button is used to trigger the micro switch. One end of the wire is connected to the micro switch, and the other end of the wire passes through the wire outlet hole of the support arm and is used to connect to the control module of the electric lifting drive device that controls the lifting of the seat cushion.

3. The handrail according to claim 1, characterized in that: A polyurethane pad is fixedly installed on the top of the sliding cover, and the polyurethane pad completely covers the upper surface of the sliding cover.

4. The handrail according to claim 1, characterized in that: The side wall of the limiting guide block is provided with a blind hole for installation. The elastic protrusion includes a compression spring and a positioning ball. The compression spring is housed in the blind hole for installation, and the positioning ball is located at the end of the compression spring away from the bottom of the blind hole. The compression spring is in a compressed state and pushes against the positioning ball outward, so that part of the spherical part of the positioning ball protrudes out of the opening of the blind hole for installation. The first positioning groove is an arc-shaped groove that matches the spherical curvature of the positioning ball.

5. An office chair, characterized in that: The chair includes a backrest, a seat cushion, a base assembly, a headrest, and an armrest as described in any one of claims 1-4. The seat cushion is mounted on the base assembly, the backrest is connected to the seat cushion, the armrests are mounted on both sides of the seat cushion via the support arms, and the headrest is mounted on the top of the backrest. The backrest, seat cushion, and armrests together form a seating space, and the base assembly integrates a backrest tilt adjustment mechanism and an electric lifting drive device.

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