A chair back adjuster

Abstract

This utility model discloses a chair back adjuster, including chair legs, a seat mounted on the upper part of the chair legs, and a chair back mounted on the rear end of the seat. Side plates are installed on both sides of the rear end of the seat, with the upper end of each side plate hinged to the chair back via a first pivot. Each side plate has an arc-shaped groove located on the lower periphery of the first pivot. A limiting shaft is inserted into the arc-shaped groove, with one end of the limiting shaft fixedly connected to the chair back. A gas spring connection control assembly is fixed to the front end of the seat, with the gas spring outer tube fixed to the rear end of the seat. The gas spring piston rod is fixed to the gas spring connection control assembly, and a gas spring valve core is provided at the top of the gas spring piston rod. This utility model uses a gas spring to drive the chair back rotation, which is convenient and labor-saving. The arc-shaped groove and limiting shaft distribute the load on the chair back, enhancing the overall load-bearing capacity. When rotating the chair back, the distance between the neck and the chair back changes little, making it easier to maintain a close fit at the support point.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, specifically to a chair back adjuster. Background Technology

[0002] A chair is a type of everyday furniture, which includes chair legs, a seat mounted on the upper part of the chair legs, and a backrest mounted on the rear of the seat. Chair legs can be fixed or can slide by casters. The seat is used to support the human buttocks and can be fixed or height-adjustable. The backrest is used to support the human waist.

[0003] Some existing chair backs are fixed and cannot be adjusted in tilt angle, resulting in poor comfort and usability. Others have adjustable backrests, with the backrest and seat hinged together by a rotating shaft located at the bottom of the seat.

[0004] When the chair back rotates, the movement trajectory of the top (neck support area) is a long-radius arc (radius ≈ chair back length), moving significantly backward and upward. The contact point between the neck and the chair back will quickly move away due to the arc's unfolding effect, requiring the user to actively tilt their head back or rely on a headrest for compensation. When tilted, the chair back support surface may slide from the shoulders to the middle of the back, easily leaving the neck unsupported. When the axis is lower, the backrest's thrust on the lower back is more direct, but if the tilt angle is large, the leverage effect may lead to insufficient lumbar support. This structure is suitable for lounge chairs requiring significant reclining, but requires an adjustable headrest to compensate for the lack of neck support by adjusting its position. Furthermore, this structure applies a large force to the rotation axis, resulting in poor stability during rotation and making it prone to damage. Utility Model Content

[0005] In order to overcome at least one of the technical problems existing in the prior art, this utility model provides a chair back angle adjuster, which uses a gas spring to drive the chair back to rotate, which is convenient and labor-saving; it is equipped with an arc groove and a limiting shaft to distribute the load on the chair back and enhance the overall load-bearing capacity; when rotating the chair back, the distance between the neck and the chair back changes little, and the support point is easier to keep in close contact.

[0006] A chair back adjuster includes chair legs, a seat mounted on the upper part of the chair legs, and a chair back mounted on the rear end of the seat;

[0007] Side panels are installed on both sides of the rear end of the chair seat. The upper end of each side panel is hinged to the chair back via a first pivot. An arc-shaped groove is opened on each side panel, located on the lower outer periphery of the first pivot. A limiting shaft is inserted into the arc-shaped groove, and one end of the limiting shaft is fixedly connected to the chair back.

[0008] A gas spring connection control assembly is fixed to the front end of the chair seat, the outer tube of the gas spring is fixed to the rear end of the chair seat, the gas spring piston rod is fixed to the gas spring connection control assembly, and a gas spring valve core is provided on the top of the gas spring piston rod.

[0009] When the gas spring valve core is triggered, the gas spring piston rod can drive the chair back to rotate along the first rotating shaft, and the limiting shaft fixedly connected to the chair back slides synchronously in the arc groove to realize the adjustment of the chair back tilt angle.

[0010] In some embodiments, the gas rod connection control assembly includes a front seat body fixed to the front end of the chair seat, a rear seat body connected to the front seat body via a connecting shaft, a gas rod piston rod connected to the rear seat body, and the front end of the gas rod piston rod extending into the rear seat body; a lever is connected to the rear seat body via a second rotating shaft, the front end of the gas rod valve core is in close contact with the outer wall of the lever, the upper end of the lever is connected to the first end of a pull rope, and the pull rope is used to drive the lever to rotate and trigger the gas rod valve core.

[0011] In some embodiments, a switch assembly is also included, which includes a switch base, a lifting switch mounted on the side wall of the switch base, and a rotating plate hinged to the switch base. One end of the rotating plate is connected to the second end of the pull rope, and the other end of the rotating plate is in close contact with the lifting rod of the lifting switch. Pressing the lifting switch can cause the rotating plate to rotate and pull the pull rope.

[0012] In some embodiments, the upper end of the lever is provided with a connector, the arc-shaped part of the connector is embedded with a connecting rod, the top wall of the connector is provided with a slot, and the first end of the pull rope passes through the slot and is fixedly connected to the connecting rod.

[0013] In some embodiments, a protective tube is provided around the pull rope, and the two ends of the protective tube are fixed to the rear seat and the switch seat respectively.

[0014] In some embodiments, the center of the arcuate groove coincides with the center of the first rotating shaft.

[0015] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0016] 1. The chair back is rotated using a gas spring, resulting in a simple, convenient, and labor-saving structure. First pivot point.

[0017] 2. The design incorporates arc-shaped grooves and limiting shafts, which can distribute the load on the chair back, enhance the overall load-bearing capacity, and improve the stability of the structure.

[0018] 3. The first pivot point is located at the upper front of the upright plate, significantly shortening the rotation radius. The movement trajectory of the top of the chair back is smoother, with a predominantly backward movement and less upward deviation. The distance between the neck and the chair back changes less, making it easier to maintain a close fit at the support point. Due to the reduced range of movement at the top, the neck is less likely to lose support when standing upright or tilted at a small angle. The synchronization between the torso and the chair back is better when tilting.

[0019] Additional aspects and advantages of this invention will continue to be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of this invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the front structure of the chair;

[0022] Figure 2 This is a side view of the structure when the present application is installed on a chair;

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 A top view of the gas spring connection control assembly;

[0025] Figure 5 This is a schematic diagram of the switch assembly.

[0026] Figure label:

[0027] Chair legs 1; Chair seat 2; Chair back 3;

[0028] Side plate 4, first rotating shaft 5, arc groove 6, limiting shaft 7;

[0029] Gas rod connection control assembly 8, front seat 800, connecting shaft 801, rear seat 802, second rotating shaft 803, lever 804, connector 8040, connecting rod 8041, slot 8042, pull rope 805, protective tube 806;

[0030] 9. Outer tube of the air rod; 10. Piston rod of the air rod; 11. Valve core of the air rod;

[0031] Switch assembly 12, switch base 120, lifting switch 121, rotating plate 122, lifting rod 1210, third rotating shaft 123. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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.

[0034] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] Reference Figures 1-5 A chair back adjuster includes a chair leg 1, a chair seat 2 installed on the upper end of the chair leg 1, and a chair back 3 installed on the rear end of the chair seat 2;

[0037] A vertically arranged side plate 4 is installed on each side of the rear end of the seat 2. The side plate 4 can be fixed to the seat 2 body by bolts or welding. The upper end of each side plate 4 is hinged to the backrest 3 through a first pivot 5. An arc-shaped groove 6 is opened on each side plate 4, which is located on the lower outer periphery of the first pivot 5. A limiting shaft 7 is inserted into the arc-shaped groove 6, and one end of the limiting shaft 7 is fixedly connected to the backrest 3.

[0038] A gas rod connection control assembly 8 is fixed to the front end of the seat 2, the gas rod outer tube 9 is fixed to the rear end of the seat 2, the gas rod piston rod 10 is fixed to the gas rod connection control assembly 8, and a gas rod valve core 11 is provided on the top of the gas rod piston rod 10.

[0039] In use, the gas spring valve core 11 is first activated, causing the gas spring piston rod 10 to drive the chair back 3 to rotate along the first rotating shaft 5. Simultaneously, the limiting shaft 7, fixedly connected to the chair back 3, slides within the arc-shaped groove 6, thus adjusting the tilt angle of the chair back 3. When the chair back 3 needs to be tilted backward, the user's back can simultaneously apply force to the chair back 3, allowing for faster adjustment. (Refer to...) Figure 1 When the gas piston rod 10 gradually extends, it pushes the lower end of the chair back 3 to rotate backward, while the upper end of the chair back 3 rotates forward; when the gas piston rod 10 gradually retracts, it pulls the lower end of the chair back 3 to rotate forward, while the upper end of the chair back 3 rotates backward. In this way, the angle between the chair back 3 and the plane of the seat 2 can be adjusted, thereby changing the tilt angle of the chair back 3 to meet the user's needs.

[0040] This application uses a gas spring to drive the rotation of the chair back 3, which is convenient and labor-saving. It features an arc-shaped groove 6 and a limiting shaft 7, which can distribute the load on the chair back 3, enhance the overall load-bearing capacity, and improve the structural stability. The first rotating shaft 5 is located at the upper front of the upright plate, significantly shortening the rotation radius (radius ≈ chair back 3 length - upright plate height). The movement trajectory of the top of the chair back 3 is smoother, with a predominantly backward movement and less upward deviation. The distance between the neck and the chair back 3 changes less, making it easier to maintain a close fit at the support point. Due to the reduced movement of the top, the neck is less likely to lose support when standing upright or tilted at a small angle. The synchronization between the torso and the chair back 3 is better when tilting. This product is suitable for office chairs and competition chairs, providing continuous support during small-angle dynamic tilting, reducing the burden of posture adjustment. When rotating the chair back 3, the distance between the neck and the chair back 3 changes less, making it easier to maintain a close fit at the support point.

[0041] In some embodiments, the gas rod connection control assembly 8 includes a front seat body 800 fixed to the front end of the chair seat 2, the two being mutually compatible U-shaped seats with a stable structure; a rear seat body 802 connected to the front seat body 800 via a connecting shaft 801, the gas rod piston rod 10 being connected to the rear seat body 802, the front end of the gas rod piston rod 10 being provided with external threads, the front end of the gas rod piston rod 10 extending into the rear seat body 802, and then being locked with a nut for easy disassembly and installation; a lever 804 is connected inside the rear seat body 802 via a second rotating shaft 803, the front end of the gas rod valve core 11 being in close contact with the outer wall of the lever 804, the upper end of the lever 804 being connected to the first end of a pull rope 805, the pull rope 805 being used to drive the lever 804 to rotate and trigger the gas rod valve core 11, thereby causing the gas rod piston rod 10 to extend forward or retract backward into the gas rod outer tube 9; on the finished chair, the gas rod connection control assembly 8 is covered with leather, textiles, or soft upholstery, etc., for a more aesthetically pleasing appearance.

[0042] In some embodiments, a switch assembly 12 is also included, which includes a switch base 120, a lifting switch 121 mounted on the side wall of the switch base 120, and a rotating plate 122 hinged to the switch base 120 via a third rotating shaft 123. One end of the rotating plate 122 is connected to the second end of the pull rope 805, and the other end of the rotating plate 122 is in close contact with the lifting rod 1210 of the lifting switch 121. In use, pressing the lifting switch 121 causes the lifting rod 1210 of the lifting switch 121 to extend and push the rotating plate 122 to rotate. After the rotating plate 122 rotates, it pulls the pull rope 805, which in turn drives the lever 804 to rotate. Then, the air rod valve core 11 extends forward to open the air passage, allowing the air rod piston rod 10 to extend and retract freely. When the lifting switch 121 is released, its lifting rod 1210 retracts, the air rod valve core 11 closes, cutting off the flow of high-pressure gas, and the air rod piston rod 10 is fixed.

[0043] In some embodiments, a connector 8040 is provided at the upper end of the lever 804, a connecting rod 8041 is embedded in the arc-shaped part of the connector 8040, and a slot 8042 is provided on the top wall of the connector 8040. The first end of the pull rope 805 passes through the slot 8042 and is fixedly connected to the connecting rod 8041. The above structure facilitates the installation and disassembly of the pull rope 805 and the lever 804, and is easy to maintain.

[0044] In some embodiments, a protective tube 806 is sleeved around the pull rope 805. The two ends of the protective tube 806 are fixed to the rear seat body 802 and the switch seat 120 respectively by fasteners such as nuts or buckles. It is easy to disassemble and the protective tube can protect the pull rope 805 and reduce wear.

[0045] In some embodiments, the center of the arc groove 6 coincides with the center of the first rotating shaft 5. The arc groove 6 is a concentric circle trajectory centered on the first rotating shaft 5 to ensure the smoothness of the tilting action. The first rotating shaft 5 is the fulcrum for the rotation of the chair back 3, and the arc groove 6 limits the tilt range of the chair back 3 through the sliding of the limiting shaft 7. Together, they realize the functions of adjustable and limited angle of the chair back 3.

[0046] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A chair back adjuster, comprising chair legs, a seat mounted on the upper end of the chair legs, and a chair back mounted on the rear end of the seat, characterized in that: Each side panel is installed on both sides of the rear end of the chair seat. The upper end of each side panel is hinged to the chair back via a first pivot. An arc-shaped groove is opened on each side panel, located on the lower outer periphery of the first pivot. A limiting shaft is inserted into the arc-shaped groove, and one end of the limiting shaft is fixedly connected to the chair back. A gas spring connection control assembly is fixed to the front end of the chair seat, the outer tube of the gas spring is fixed to the rear end of the chair seat, the gas spring piston rod is fixed to the gas spring connection control assembly, and a gas spring valve core is provided on the top of the gas spring piston rod. When the gas spring valve core is triggered, the gas spring piston rod can drive the chair back to rotate along the first rotating shaft, and the limiting shaft fixedly connected to the chair back slides synchronously in the arc groove to realize the adjustment of the chair back tilt angle.

2. The chair back adjuster as described in claim 1, characterized in that: The gas spring connection control assembly includes a front seat body fixed to the front end of the chair seat, a rear seat body connected to the front seat body via a connecting shaft, a gas spring piston rod connected to the rear seat body, and the front end of the gas spring piston rod extending into the rear seat body; a lever is connected to the rear seat body via a second rotating shaft, the front end of the gas spring valve core is in close contact with the outer wall of the lever, the upper end of the lever is connected to the first end of a pull rope, and the pull rope is used to drive the lever to rotate and trigger the gas spring valve core.

3. The chair back adjuster as described in claim 2, characterized in that: It also includes a switch assembly, which includes a switch base, a lifting switch mounted on the side wall of the switch base, and a rotating plate hinged to the switch base. One end of the rotating plate is connected to the second end of the pull rope, and the other end of the rotating plate is in close contact with the lifting rod of the lifting switch. Pressing the lifting switch can cause the rotating plate to rotate and pull the pull rope.

4. The chair back adjuster as described in claim 3, characterized in that: The upper end of the lever is equipped with a connector, and the arc-shaped part of the connector is embedded with a connecting rod. The top wall of the connector is provided with a slot, and the first end of the pull rope passes through the slot and is fixedly connected to the connecting rod.

5. The chair back adjuster as described in claim 4, characterized in that: The pull rope is fitted with a protective tube, and the two ends of the protective tube are fixed to the rear seat and the switch seat respectively.

6. The chair back adjuster as described in claim 5, characterized in that: The center of the arc-shaped groove coincides with the center of the first rotating shaft.

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