A training chair rotary connection structure

Abstract

A training chair rotating connection structure, including back frame and two rotating supports made of metal, the left and right ends of the back frame are protruding with rotating connection parts, two rotating supports are respectively rotatably connected with two rotating connection parts, the rotating connection parts and the rotating supports jointly form torsion spring installation grooves, two torsion arms are arranged in the torsion spring installation grooves and connected with the reset torsion springs of the rotating connection parts and the rotating supports; the rotating connection parts are provided with arc-shaped limiting grooves, and the rotating supports are provided with arc-shaped protrusions which can move along the arc-shaped limiting grooves in the arc-shaped limiting grooves. The arc-shaped protrusions have improved structural durability and reliability, and the service life of the training chair is prolonged. Meanwhile, the first mute sleeve and the second mute sleeve are arranged to reduce the noise during rotation, effectively reduce the sound interference during rotation, and improve the comfort experience during use.

Description

Technical Field

[0001] This utility model relates to the field of training chair technology, and specifically to a rotating connection structure for a training chair. Background Technology

[0002] Training chairs, as furniture provided for convenience in daily work and social activities, directly impact user experience through their comfort and structural stability. To ensure a comfortable backrest, existing training chairs are typically designed with a rotatable connection between the backrest frame and the chair frame.

[0003] Referring to the technical solution of announcement number CN 219556764 U, in this technical solution, the chair back frame and the rotating support are rotatably connected. The chair back frame is provided with an arc-shaped protrusion, and the rotating support is provided with an arc-shaped limiting groove corresponding to the arc-shaped protrusion. The rotation is limited by the arc-shaped protrusion abutting against the two ends of the arc-shaped limiting groove. The structure is simple and practical.

[0004] However, in existing technologies, chair back frames are mostly manufactured using injection molding, and to simplify the manufacturing process, the curved protrusion is usually integrally molded with the chair back frame. However, since the curved protrusion is the main force-bearing component when the chair back rotates and limits its movement, it must repeatedly withstand the compression, friction, and torque caused by rotation during long-term use. Under prolonged stress, the curved protrusion is prone to cracking, breakage, and other damage, affecting the lifespan of the training chair. Furthermore, the torsion spring can easily rub against the metal rotating support components during operation, generating noise and affecting the user experience. Utility Model Content

[0005] In order to overcome at least one deficiency of the prior art, this utility model provides a rotating connection structure for a training chair.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A rotating connection structure for a training chair includes a back frame and two rotating support members made of metal. Rotating connection portions protrude from both ends of the back frame. The two rotating support members are rotatably connected to the two rotating connection portions. A torsion spring mounting groove is formed between the rotating connection portions and the rotating support members. Two return torsion springs with torsion arms connected to the rotating connection portions and the rotating support members are respectively disposed within the torsion spring mounting groove. The structure is characterized by: The rotating connection part is provided with an arc-shaped limiting groove, which includes an inner arc surface and a forward tilting limiting surface and a backward tilting limiting surface located at both ends of the inner arc surface. The rotating support has an arc-shaped protrusion that can move along the arc-shaped limiting groove within the arc-shaped limiting groove. The arc-shaped protrusion includes a forward tilting mating surface for engaging with the forward tilting limiting surface to limit the forward tilting angle of the back frame and a backward tilting mating surface for engaging with the backward tilting limiting surface to limit the backward tilting angle of the back frame.

[0007] In this utility model, the rotating connecting part is further provided with a first mounting groove, and the rotating support member is provided with a second mounting groove. The first mounting groove and the second mounting groove correspond to each other and form the torsion spring mounting groove.

[0008] In this invention, the arc-shaped limiting groove is located on the outer periphery of the first mounting groove and communicates with the first mounting groove; there are at least two arc-shaped limiting grooves, and each arc-shaped limiting groove corresponds to one arc-shaped protrusion.

[0009] In this invention, the arc-shaped protrusion further includes a raised outer arc surface, the forward tilting mating surface and the backward tilting mating surface are respectively located at both ends of the raised outer arc surface, and the raised outer arc surface slides in contact with the inner arc surface of the groove.

[0010] In this utility model, a first silent sleeve is provided in the second mounting groove, which is wrapped around the reset torsion spring. The first silent sleeve is non-rotatably disposed in the torsion spring mounting groove.

[0011] In this utility model, the first mounting groove is provided with a rotating mounting part, and the rotating support is provided with a first through hole that axially connects to the second mounting groove. A fastening bolt is inserted through the first through hole, and the thread of the fastening bolt is engaged with the internal thread hole of the rotating mounting part. The first silent sleeve is provided with a first bushing, which extends into the first through hole and is fitted onto the outside of the fastening bolt thread section.

[0012] In this utility model, the rotating support is provided with a foldable and unfoldable handrail module. The handrail module includes a handrail connecting seat made of metal. The handrail connecting seat is rotatably connected to the rotating support. A second silent sleeve is provided at the rotatable connection between the handrail connecting seat and the rotating support.

[0013] In this utility model, the rotating support member is further provided with a mating mounting groove on the side opposite to the rotating connection part. The first through hole is axially connected to the mating mounting groove. The groove surface of the mating mounting groove is provided with an anti-rotation protrusion. The second main body of the second silent sleeve is embedded into the mating mounting groove. The second main body is provided with an anti-rotation groove. The anti-rotation groove and the anti-rotation protrusion form a concave-convex fit to restrict the rotation of the second silent sleeve relative to the rotating support member.

[0014] In this utility model, the second silent sleeve is provided with a sound insulation mounting groove, and an arc-shaped limiting boss protrudes in the sound insulation mounting groove; the armrest connecting seat is provided with an armrest shaft that rotates with the sound insulation mounting groove, and the outer peripheral surface of the armrest shaft is provided with an arc-shaped limiting groove for the arc-shaped limiting boss to move, and the two ends of the arc-shaped limiting groove are respectively an unfolding limiting surface and a retracting limiting surface.

[0015] In this utility model, the arc-shaped limiting boss and the anti-rotation groove correspond one-to-one, and the anti-rotation groove extends into the arc-shaped limiting boss.

[0016] The beneficial effects of this utility model are as follows: By setting arc-shaped limiting grooves at both ends of the back frame and arc-shaped protrusions on the metal rotating support, the limiting force is borne by the arc-shaped protrusions of the metal, avoiding the problem of cracking and failure of the arc-shaped protrusions caused by local stress concentration in the injection molded parts. This effectively improves the structural durability and reliability of the arc-shaped protrusions, thereby extending the service life of the training chair. At the same time, this utility model is equipped with a first silent sleeve and a second silent sleeve to reduce noise during rotation, effectively reducing sound interference during rotation and improving the comfort experience during use. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a perspective view of Example 1; Figure 2 Explosion of some parts in Example 1 Figure 1 ; Figure 3 Explosion of some parts in Example 1 Figure 2 ; Figure 4 Explosion of some parts in Example 1 Figure 3 ; Figure 5 This is a schematic diagram of the combination of the back frame, armrest module, and rotating support in Embodiment 1; Figure 6 This is a schematic diagram of the fit between the arc-shaped limiting groove and the arc-shaped protrusion in Example 1; Figure 7 This is a schematic diagram showing the fit between the arc-shaped limiting boss and the arc-shaped limiting groove in Example 1; Figure 8 This is a perspective view of Example 2. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0019] It should be noted that if any directional indication is involved in the embodiments of this utility model (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), then the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, 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 invention based on the specific circumstances.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model. Example 1:

[0022] Reference Figure 1-7 A rotating connection structure for a training chair includes a back frame 1 and two rotating support members 2 made of metal. The two rotating support members 2 are mounted on a chair frame 3. Rotating connection parts 11 protrude from both the left and right ends of the back frame 1. The two rotating support members 2 are rotatably connected to the two rotating connection parts 11 respectively. The rotating connection parts 11 and the rotating support members 2 together form a torsion spring mounting groove. The torsion spring mounting groove is provided with two return torsion springs 4 whose torsion arms are respectively connected to the rotating connection parts 11 and the rotating support members 2.

[0023] Furthermore, the rotating connection part 11 is provided with an arc-shaped limiting groove 12. The arc-shaped limiting groove 12 includes an inner arc surface 121 and a forward tilting limiting surface 122 and a backward tilting limiting surface 123 located at both ends of the inner arc surface 121. The rotating support member 2 is provided with an arc-shaped protrusion 21 that can move arc-shaped along the arc-shaped limiting groove 12. The arc-shaped protrusion 21 includes a forward tilting mating surface 212 for cooperating with the forward tilting limiting surface 122 to limit the forward tilting angle of the back frame 1 and a backward tilting mating surface 213 for cooperating with the backward tilting limiting surface 123 to limit the backward tilting angle of the back frame 1.

[0024] In this embodiment, the rotating connecting part 11 is further provided with a first mounting groove 13, and the rotating support member 2 is provided with a second mounting groove 22. The first mounting groove 13 and the second mounting groove 22 correspond to each other and form the torsion spring mounting groove. Further, the groove surface of the first mounting groove 13 is provided with a first arm groove 131, and the groove surface of the second mounting groove 22 is provided with a second arm groove 221. The two torsion arms of the reset torsion spring 4 are respectively engaged in the first arm groove 131 and the second arm groove 221, thereby completing the installation of the reset torsion spring 4.

[0025] In this embodiment, the arc-shaped limiting groove 12 is located on the outer periphery of the first mounting groove 13 and communicates with the first mounting groove 13 to facilitate injection molding. Furthermore, there are two arc-shaped limiting grooves 12, each corresponding to one arc-shaped protrusion 21.

[0026] In this embodiment, the arc-shaped protrusion 21 further includes a raised outer arc surface 211. The forward tilting mating surface 212 and the backward tilting mating surface 213 are respectively located at the two ends of the raised outer arc surface 211. The raised outer arc surface 211 slides with the inner arc surface 121 of the groove to ensure that the back frame 1 is smooth and stable during rotation, and also allows the rotating connection part 11 to be rotatably connected to the rotating support member 2.

[0027] In this embodiment, since the rotating support 2 is made of metal, the return torsion spring 4 is prone to metal-to-metal friction noise with the surface of the rotating support 2 during operation, and is also prone to local wear after long-term use. To solve this problem, this embodiment provides a first silent sleeve 5 wrapped around the return torsion spring 4 in the second mounting groove 22. Furthermore, to avoid rotational wear of the first silent sleeve 5, the first silent sleeve 5 is non-rotatably disposed in the torsion spring mounting groove. Specifically, the second mounting groove 22 is provided with at least one rotation limiting groove 222. The first silent sleeve 5 includes a sound insulation sleeve body 50 and a first spacer fitting part 51 embedded in the rotation limiting groove 222 to form a circumferential limit. The first spacer fitting part 51 is integrally formed and connected to the outer periphery of the sound insulation sleeve body 50.

[0028] In this embodiment, a rotating mounting part 14 is provided in the first mounting groove 13, and a first through hole 20 axially communicating with the second mounting groove 22 is provided on the rotating support member 2. A fastening bolt 6 is inserted through the first through hole 20. The rotating mounting part 14 is provided with an internal threaded hole 141. The thread of the fastening bolt 6 is engaged in the internal threaded hole 141 of the rotating mounting part 14, so that the rotating connection part 11 and the rotating support member 2 can be rotatably connected.

[0029] Furthermore, the first silent sleeve 5 is provided with a first bushing 52, which is integrally formed with the first silent sleeve 5. The inner wall of the first bushing 52 has a first inner hole 53 through which the threaded section of the fastening bolt 6 passes. The first bushing 52 extends into the first through hole 20 and is fitted over the threaded section of the fastening bolt 6, thereby avoiding direct contact between the threaded section of the fastening bolt 6 and the first through hole 20, which would generate metal friction noise. The outer wall of the first bushing 52 fits against the inner wall of the first through hole 20, thereby improving the positioning and installation quality of the first silent sleeve 5. In addition, the diameter of the first through hole 20 gradually decreases along the direction away from the second mounting groove 22, and the outer diameter of the first bushing 52 gradually decreases along the direction away from the first silent sleeve 5, so that the first bushing 52 and the first through hole 20 form a progressive fit. This not only facilitates the assembly of the first bushing 52 into the first through hole 20, but also achieves axial pre-tightening and radial self-centering through the tapered surface fit.

[0030] Furthermore, the rotating mounting part 14 is inserted into the second mounting groove 22 after being combined with the rotating connecting part 11 and the rotating support 2. The rotating mounting part 14 is provided with a rotating insertion part 142 along the axial direction. The internal threaded hole 141 extends through the axial end face of the rotating insertion part 142. The diameter of the rotating mounting part 14 is larger than the diameter of the rotating insertion part 142. The diameter of the first inner hole 53 of the first bushing 52 gradually decreases along the direction away from the first silent sleeve 5. The diameter of the rotating insertion part 142 is smaller than the maximum diameter of the first inner hole 53 of the first bushing 52, so that the rotating insertion part 142 can be smoothly inserted into the first inner hole 53 of the first bushing 52.

[0031] In this embodiment, the rotating support 2 is provided with a foldable and unfoldable handrail module 7. The handrail module 7 includes a metal handrail connecting seat 71 and a handrail body 72 installed on the handrail connecting seat 71 by bolt connection. The handrail connecting seat 71 is rotatably connected to the rotating support 2. A second silent sleeve 8 is provided at the rotatable connection between the handrail connecting seat 71 and the rotating support 2. The handrail connecting seat 71 is provided with a second through hole 711 corresponding to the first through hole 20. The second silent sleeve 8 is provided with a second inner hole 80 corresponding to the second through hole 711 and the first inner hole 53. The screw section of the fastening bolt 6 passes through the second through hole 711 and the second inner hole 80, so that the handrail module 7 and the rotating support 2 cannot be separated at will. Furthermore, the armrest connecting seat 71 is also provided with an armrest groove 712 communicating with the second through hole 711. The head of the fastening bolt 6 is located in the armrest groove 712, reducing the risk of the head of the fastening bolt 6 being damaged by external factors. A mating washer 10 for contacting the groove surface of the armrest groove 712 is fitted on the threaded section of the fastening bolt 6. In addition, a decorative cover 9 is provided in the armrest groove 712. The decorative cover 9 is embedded in the armrest groove 712 by interference fit, thereby completing the installation of both.

[0032] In this embodiment, the rotating support member 2 is further provided with a mating mounting groove 23 on the side opposite to the rotating connection part 11. The first through hole 20 is axially connected to the mating mounting groove 23. The groove surface of the mating mounting groove 23 is provided with an anti-rotation protrusion 231. The second silent sleeve 8 includes a second isolation ring 81 and a second main body part 82. The second isolation ring 81 is disposed on the outer periphery of the second main body part 82. The second main body part 82 of the second silent sleeve 8 is embedded into the mating mounting groove 23. The second main body part 82 is provided with an anti-rotation groove 83 corresponding to the anti-rotation protrusion 231 and matching the shape of the anti-rotation protrusion 231. The anti-rotation groove 83 and the anti-rotation protrusion 231 form a concave-convex fit to restrict the rotation of the second silent sleeve 8 relative to the rotating support member 2.

[0033] Furthermore, the second silent sleeve 8 is provided with a sound insulation mounting groove 84, and an arc-shaped limiting boss 841 protrudes from the sound insulation mounting groove 84; the armrest connecting seat 71 has a protruding armrest shaft 713 that rotatably engages with the sound insulation mounting groove 84, realizing a rotatable connection between the armrest connecting seat 71 and the rotating support 2; the outer circumferential surface of the armrest shaft 713 is provided with an arc-shaped limiting groove 714 for the arc-shaped limiting boss 841 to move, and the two ends of the arc-shaped limiting groove 714 are respectively an unfolding limiting surface and a retracting limiting surface. When the arc-shaped limiting boss 841 contacts the unfolding limiting surface or the retracting limiting surface, the rotation of the armrest shaft 713 is rigidly limited, thereby realizing reliable positioning of the armrest module 7 at the two extreme positions of unfolding and retracting. At the same time, the second silent sleeve 8 also plays a damping role, preventing the armrest module 7 from unfolding when no one is operating it.

[0034] Furthermore, the arc-shaped limiting boss 841 corresponds one-to-one with the anti-rotation groove 83, and the anti-rotation groove 83 extends into the arc-shaped limiting boss 841. In this way, when the anti-rotation protrusion 231 is embedded in the anti-rotation groove 83, the anti-rotation protrusion 231 can provide support for the arc-shaped limiting boss 841, ensuring that the arc-shaped limiting boss 841 does not break under stress.

[0035] In this embodiment, both the first silencing sleeve 5 and the second silencing sleeve 8 are made of engineering plastics, such as nylon. Example 2:

[0036] like Figure 8 As shown, the structure of this embodiment is basically the same as that of embodiment 1. The difference is that the armrest module 7 is installed on the chair frame 3, and the head of the fastening bolt 6 and the mating washer 10 are both located in the mating groove, so that the rotating support 2 and the rotating connection part 11 are inseparable. The decorative cover 9 is inserted into the mating mounting groove 23 by interference fit, so as to avoid the head of the fastening bolt 6 being exposed.

[0037] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A rotating connection structure for a training chair, comprising a back frame (1) and two rotating support members (2) made of metal, wherein rotating connection parts (11) protrude from both the left and right ends of the back frame (1), and the two rotating support members (2) are rotatably connected to the two rotating connection parts (11) respectively, wherein the rotating connection parts (11) and the rotating support members (2) together form a torsion spring mounting groove, and two reset torsion springs (4) with torsion arms respectively connected to the rotating connection parts (11) and the rotating support members (2) are provided in the torsion spring mounting groove; characterized in that: The rotating connection part (11) is provided with an arc-shaped limiting groove (12). The arc-shaped limiting groove (12) includes an inner arc surface (121) and a forward tilting limiting surface (122) and a backward tilting limiting surface (123) located at both ends of the inner arc surface (121). The rotating support (2) has an arc-shaped protrusion (21) that can move in an arc-shaped groove (12) within the arc-shaped limiting groove (12). The arc-shaped protrusion (21) includes a forward tilting mating surface (212) for cooperating with the forward tilting limiting surface (122) to limit the forward tilting angle of the back frame (1) and a backward tilting mating surface (213) for cooperating with the backward tilting limiting surface (123) to limit the backward tilting angle of the back frame (1).

2. The training chair rotating connection structure according to claim 1, characterized in that: The rotating connection part (11) is also provided with a first mounting groove (13), and the rotating support (2) is provided with a second mounting groove (22). The first mounting groove (13) and the second mounting groove (22) correspond to each other and form the torsion spring mounting groove.

3. The training chair rotating connection structure according to claim 2, characterized in that: The arc-shaped limiting groove (12) is located on the outer periphery of the first mounting groove (13) and communicates with the first mounting groove (13); there are at least two arc-shaped limiting grooves (12), and each arc-shaped limiting groove (12) corresponds to one arc-shaped protrusion (21).

4. A training chair rotating connection structure according to any one of claims 1-3, characterized in that: The arc-shaped protrusion (21) also includes a raised outer arc surface (211), the forward tilting mating surface (212) and the backward tilting mating surface (213) are located at the two ends of the raised outer arc surface (211), and the raised outer arc surface (211) slides in fit with the inner arc surface (121) of the groove.

5. A rotating connection structure for a training chair according to claim 2 or 3, characterized in that: The second mounting groove (22) is provided with a first silent sleeve (5) that is wrapped around the reset torsion spring (4). The first silent sleeve (5) is non-rotatably disposed in the torsion spring mounting groove.

6. The training chair rotating connection structure according to claim 5, characterized in that: The first mounting groove (13) is provided with a rotating mounting part (14), and the rotating support (2) is provided with a first through hole (20) that axially connects to the second mounting groove (22). A fastening bolt (6) is inserted through the first through hole (20), and the thread of the fastening bolt (6) is engaged in the internal thread hole (141) of the rotating mounting part (14). The first silent sleeve (5) is provided with a first bushing (52), which extends into the first through hole (20) and is fitted outside the screw section of the fastening bolt (6).

7. The training chair rotating connection structure according to claim 6, characterized in that: The rotating support (2) is provided with a foldable and unfoldable handrail module (7). The handrail module (7) includes a metal handrail connecting seat (71). The handrail connecting seat (71) is rotatably connected to the rotating support (2). A second silent sleeve (8) is provided at the rotatable connection between the handrail connecting seat (71) and the rotating support (2).

8. The training chair rotating connection structure according to claim 7, characterized in that: The rotating support (2) is provided with a mating mounting groove (23) on the side opposite to the rotating connection part (11). The first through hole (20) is axially connected to the mating mounting groove (23). The mating mounting groove (23) has an anti-rotation protrusion (231) on its groove surface. The second main body (82) of the second silent sleeve (8) is embedded in the mating mounting groove (23). The second main body (82) has an anti-rotation groove (83). The anti-rotation groove (83) and the anti-rotation protrusion (231) form a concave-convex fit to restrict the rotation of the second silent sleeve (8) relative to the rotating support (2).

9. The rotating connection structure for a training chair according to claim 8, characterized in that: The second silent sleeve (8) is provided with a sound insulation mounting groove (84), and an arc-shaped limiting boss (841) protrudes in the sound insulation mounting groove (84); the armrest connecting seat (71) is provided with an armrest shaft (713) that rotates with the sound insulation mounting groove (84), and the outer peripheral surface of the armrest shaft (713) is provided with an arc-shaped limiting groove (714) for the arc-shaped limiting boss (841) to move, and the two ends of the arc-shaped limiting groove (714) are respectively an unfolding limiting surface and a retracting limiting surface.

10. The training chair rotating connection structure according to claim 9, characterized in that: The arc-shaped limiting boss (841) corresponds one-to-one with the anti-rotation groove (83), and the anti-rotation groove (83) extends into the arc-shaped limiting boss (841).

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