A locking mechanism

Abstract

The utility model discloses a locking mechanism is located on swivel chair, it includes fixed module and assembly module with connecting rod cooperation fixed on the seat, rotatable movable cooperation between fixed module and assembly module, locking mechanism still includes the locking pin of movable setting on fixed module, assembly module includes the locating portion, and locking pin abuts the locating portion and adds locking force. Rotatable movable cooperation between fixed module and assembly module, can realize the rotation of seat, further avoid the wear and tear of the air pressure stick component between because of rotation, also can not because seat rotation make air pressure stick temperature rise, pressure increase and cause explosion, provide more safe use environment for user, and user does not need to leave seat when adjusting rotation, make the swivel chair of carrying the utility model more convenient when adjusting rotation, improve the use experience, and locking mechanism realizes the control of swivel chair rotation function through the cooperation of locking pin and locating portion, can lock swivel chair when user needs.

Description

Technical Field

[0001] This utility model relates to the field of manufacturing and designing swivel chairs, and more specifically, to a locking mechanism. Background Technology

[0002] In modern office and living settings, chairs, as tools used for extended periods, are receiving increasing attention for their functionality and comfort. Among these features, the swivel function of a chair is a key characteristic, allowing people to flexibly change their posture and orientation in different work or life situations, greatly enhancing convenience and comfort.

[0003] Currently, most swivel chairs on the market use a gas spring with adjustable angle to achieve rotation adjustment. This design meets the basic requirement of seat rotation to a certain extent, but in actual use, it has revealed many obvious drawbacks.

[0004] There are several risks associated with adjusting the swivel chair using a gas spring while seated. Firstly, body weight applies additional pressure to the gas spring, accelerating wear on its internal components and shortening its lifespan. Secondly, if the gas spring is of poor quality—for example, if the tube walls are too thin, the inert gas is impure, or the filling gas concentration is insufficient—the cylinder temperature may rise sharply and the pressure increase during adjustment, potentially leading to an explosion and serious injury. Due to these risks, removing the user from the chair before making adjustments can ensure safety to some extent and help extend the chair's lifespan. However, requiring the user to leave the chair for every adjustment significantly reduces the user experience.

[0005] In addition, the structure of the adjustable-angle pneumatic rod is relatively complex, and its manufacturing requires high-precision processing technology and high-quality materials, which leads to high product costs. This not only limits the market competitiveness of manufacturers, but also increases the purchase and use costs for consumers. Utility Model Content

[0006] This utility model overcomes the shortcomings of the prior art and provides a locking mechanism that is simple in structure and reasonable in design, making the swivel chair safe and convenient to use, reducing the cost of use, and providing a better user experience.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A locking mechanism includes a fixing module fixed to a chair seat and an assembly module that cooperates with a connecting rod, wherein the fixing module and the assembly module are rotatably engaged; it also includes a locking pin movably disposed on the fixing module; the assembly module includes a positioning part, and the locking pin abuts against the positioning part to apply a locking force.

[0008] Furthermore, the fixed module is provided with an assembly space and a locking active space, and a connecting channel is provided between the assembly space and the locking active space to make them communicate with each other; the assembly module is rotatably disposed in the assembly space; the locking pin is movably disposed in the locking active space and abuts against the positioning part through the connecting channel.

[0009] Furthermore, friction-reducing components are provided between the inner wall of the assembly space and the assembly module, and the two components respectively mate with different surfaces of the friction-reducing components.

[0010] Furthermore, the assembly module includes a support tube that connects and mates with the connecting rod; a mating part extending outward along its circumference is provided in the middle of the outer surface of the support tube, and the mating part and the top of the support tube are located in the assembly space; the bottom of the fixing module is provided with an opening with an inner diameter smaller than the diameter of the mating part, allowing the bottom end of the support tube to be exposed; the friction-reducing component is annularly sleeved on the support tube, and the upper and lower surfaces of the friction-reducing component abut against the inner wall of the assembly space and the mating part, respectively.

[0011] Furthermore, the positioning part is fixed in a circular shape to the tube body or mating part of the support tube; locking grooves that cooperate with the locking pin are distributed along the circumference of the positioning part, and the opening of the locking groove is opened on the outer surface of the positioning part; each locking groove and the connecting channel are on the same horizontal plane; the moving path of the locking pin and the length direction of the locking groove are both corresponding to the radial direction of the positioning part.

[0012] Furthermore, it also includes an adjustment part for adjusting the relationship between the locking pin and the positioning part; the adjustment part includes an adjustment handle, with an adjustment end and a mating end at its two ends; the mating end is located in the locking activity space and mats with the locking pin; the fixing module is provided with an adjustment opening for the adjustment end to extend out of the locking activity space.

[0013] Furthermore, a mounting plate is fixedly installed within the locking space, and an adjustment handle is positioned between the two mounting plates. A left and right mating plate are respectively installed on the same surfaces on the left and right sides of the mating end. Corresponding rotating shafts are installed on the outer surfaces of the left and right mating plates. Rotary mounting holes that mate with the rotating shafts are provided on the mounting plates. Corresponding adjustment grooves are provided on the left and right mating plates. The adjustment part includes an adjustment rod that passes through the locking pin, and its two ends are movably located within the adjustment grooves of the left and right mating plates. The adjustment grooves are curved, with a locking end and a releasing end at their two ends. The rotating shaft, locking end, and releasing end are arranged in a right-angled triangle shape, with the rotating shaft at the vertex of the right angle. The distance between the locking end and the rotating shaft is greater than the distance between the releasing end and the rotating shaft.

[0014] Furthermore, an adjustment groove is provided at the end of the locking pin near the adjustment handle; the adjustment groove is provided in the direction of the length of the locking pin; the adjustment rod passes through the adjustment groove; a stop is provided in the middle of the locking pin, and a spring is sleeved on the locking pin, with the two ends of the spring abutting against the adjustment rod and the stop respectively.

[0015] Furthermore, the fixing module includes a fixing base and a fixing cover; the fixing base is fixedly installed on the lower surface of the chair seat, and the fixing cover is detachably assembled to the fixing base by bolts; the fixing base has a first space and a second space, and a connecting groove is provided between the first space and the second space to make them communicate; the fixing cover has a third space and a fourth space; the first space and the third space cooperate to form an assembly space, and the second space and the fourth space cooperate to form a locking movable space; the mounting plate is fixed to the fixing base; and is set on the fixing cover through an opening; both the fixing base and the fixing cover are provided with adjustment openings for adjusting the extension of the adjustment end of the handle; a guide plate is provided on the fixing cover corresponding to the connecting groove, and the guide plate is set in the length direction of the connecting channel. When the fixing base and the fixing cover are engaged, the guide plate is at the opening of the connecting groove to form the connecting channel; the guide plate is inclined from the end away from the third space to its upper surface.

[0016] Furthermore, the friction-reducing component is located between the mating part and the fixed seat; the upper surface of the friction-reducing component abuts against the fixed seat, and the lower surface of the friction-reducing component abuts against the positioning part and / or the mating part; the locking groove is outside the blocking range of the friction-reducing component. Beneficial effects

[0017] In this invention, the rotatable engagement between the fixed module and the assembly module enables the seat to rotate, thus preventing wear between the gas spring components due to rotation. Furthermore, since the gas spring does not need to support the seat's rotation, it prevents the gas spring from overheating and increasing in pressure due to seat rotation, thus avoiding an explosion and providing a safer user environment. With enhanced safety, users can adjust the rotation without leaving the seat, making the swivel chair with this invention more convenient and improving the user experience. Finally, the locking mechanism controls the swivel chair's rotation function through the cooperation of the locking pin and the positioning part, allowing the swivel chair to be locked when needed.

[0018] In this invention, the connecting rod is a pneumatic rod, which only needs to support the seat's lifting and lowering operation. Compared to a pneumatic rod that supports both rotation and lifting, it has a simpler structure, fewer parts, and relatively lower manufacturing costs, thus reducing usage costs. A pneumatic rod that supports both rotation and lifting has a more complex internal structure, needing to withstand the torque generated during rotation and the axial force during lifting, making it more difficult to control changes in internal air pressure and temperature. In contrast, a pneumatic rod that only supports lifting has a relatively simple structure, a single stress condition, and makes changes in internal air pressure and temperature easier to control, greatly reducing the possibility of explosion and providing a safer operating environment for the user.

[0019] In this invention, an assembly space and a locking movement space are provided within the fixed module, and the two are connected by a connecting channel. This fully utilizes the internal space of the fixed module, making the entire locking mechanism more compact. It ensures that the assembly module can be rotatably mounted within the assembly space, enabling the swivel chair to rotate; it also provides sufficient space for the locking pin to move within the locking movement space; simultaneously, the connecting channel limits and guides the movement of the locking pin, thereby achieving contact with the positioning part and completing the locking action. This design avoids interference between components and improves space utilization.

[0020] In this invention, the friction-reducing component can provide a relatively smooth contact surface, which not only makes the rotation of the assembly module in the assembly space more stable and smooth, but also greatly reduces friction, thereby reducing the wear on both and improving the durability of use. Moreover, the friction-reducing component reduces friction, making it easier and less strenuous for users to rotate the swivel chair. Whether adjusting the sitting posture or changing the direction, no great effort is required, which improves the convenience and comfort of operation.

[0021] In this invention, the mating part provides stable support for the support tube, ensuring that the support tube maintains the correct position within the assembly space; the friction-reducing part is annularly sleeved on the support tube, which does not occupy too much extra space, making the overall structure compact.

[0022] In this invention, the positioning part is fixed in a circular shape on the support tube or the mating part, and locking grooves are distributed along its circumference. This design allows the locking pin to engage with the locking grooves in multiple positions, greatly improving the flexibility of locking. When using the swivel chair, people can choose to reliably lock it at the desired position according to their real-time needs, meeting the requirements for fixing the angle of the swivel chair in different usage scenarios.

[0023] In this invention, each locking slot and the connecting channel are on the same horizontal plane, and the moving path of the locking pin and the length direction of the locking slot are corresponding to the radial direction of the positioning part. This arrangement allows the locking pin to smoothly enter the locking slot through the connecting channel during the locking process, achieving fast and accurate locking and improving the safety and stability of the swivel chair.

[0024] In this invention, the adjusting end of the adjusting handle extends out of the adjusting opening of the fixing module, allowing the user to directly grasp the adjusting end for operation, thereby conveniently and quickly adjusting the engagement between the locking pin and the positioning part, and quickly completing the locking or unlocking operation.

[0025] In this invention, the left and right mating plates are provided with corresponding curved adjustment grooves, with their ends being a locking end and a releasing end, respectively. This design allows the adjusting rod to move within the adjustment groove, precisely controlling the degree of engagement between the locking pin and the positioning part according to the curve shape of the adjustment groove. When the adjusting rod moves to the locking end, the locking pin and the positioning part engage tightly to achieve a stable lock. When the adjusting rod moves to the releasing end, the engagement between the locking pin and the positioning part loosens, facilitating rotational adjustment.

[0026] In this invention, an adjustment groove is provided along the length of the locking pin at one end near the adjusting handle, and the adjusting rod passes through the adjustment groove. This design allows the locking pin to have a certain amount of movement when the adjusting handle controls the locking pin to move closer to the positioning part for locking. When the locking pin is not aligned with the opening of the locking groove, and the adjusting handle controls the locking pin to lock, the locking pin can retract through this amount of movement, thereby preventing the locking pin from colliding with the positioning part and being damaged. Furthermore, the spring allows the locking pin to exert a force towards the positioning part while still having a certain amount of retraction, thus enabling it to enter the locking groove and complete the locking operation when aligned with the opening of the locking groove.

[0027] In this invention, the detachable fixing cover design makes the initial installation simpler and more convenient; during later maintenance, operators can also easily open the fixing cover to inspect, repair, or replace the internal components. When the adjusting handle moves the adjusting rod, the guide plate provides precise guidance for the adjusting rod, ensuring that the adjusting rod moves along the predetermined trajectory within the connecting channel, reducing friction and jamming between the adjusting rod and the guide plate.

[0028] In this invention, the locking groove is outside the shielding area of ​​the friction-reducing component. This design ensures that the locking pin can smoothly enter the locking groove during the locking process, achieving reliable locking. When a person sits down, gravity is transmitted from top to bottom. The area where the assembly module mainly bears the force is the contact area between the mating part and the fixed seat. The friction-reducing component is set here to make full use of this force characteristic and maximize the effect of reducing friction. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a swivel chair equipped with this utility model.

[0030] Figure 2 This is a structural diagram of the present invention in conjunction with the connecting rod.

[0031] Figure 3 This is a cross-sectional view of the part where the present invention mates with the connecting rod.

[0032] Figure 4 This is a cross-sectional view of the fixed module.

[0033] Figure 5 This is a structural diagram showing the assembly module and friction-reducing components working together.

[0034] Figure 6 This is a structural diagram of the joint between the positioning part and the support tube.

[0035] Figure 7 This is a structural diagram of the support tube.

[0036] Figure 8 This is a structural diagram of the positioning part.

[0037] Figure 9 This is a structural diagram showing the fit between the adjusting part and the locking pin.

[0038] Figure 10 The structural diagram for adjusting the handle.

[0039] Figure 11 This is a structural diagram of the locking pin.

[0040] Figure 12 This is a structural diagram of the fixed base.

[0041] Figure 13 This is a structural diagram of the fixed cover.

[0042] Figure 14 This is a cross-sectional view of the mating area between the stabilizing groove and the stabilizing block.

[0043] Numbering on the map: 1. Locking mechanism; 2. Seat; 3. Connecting rod; 4. Fixing module; 5. Assembly module; 6. Locking pin; 7. Friction reducing component; 8. Adjusting part; 31. Control switch; 41. Assembly space; 42. Locking movement space; 43. Connecting channel; 44. Adjusting opening; 45. Fixing seat; 46. Fixing cover; 47. Passage opening; 48. Stabilizing groove; 51. Positioning part; 52. Support tube; 61. Adjusting groove; 62. Stop; 63. Spring; 81. Adjusting handle; 82. Adjusting rod; 421. Mounting plate; 422. Rotary mounting hole; 423. Locking positioning hole ; 424. Unlocking positioning hole; 451. First space; 452. Second space; 453. Connecting groove; 454. Adjusting lever; 461. Third space; 462. Fourth space; 463. Guide plate; 511. Locking groove; 512. Installation space; 521. Mating part; 522. Installation through hole; 523. Installation block; 524. Stabilizing block; 811. Adjusting end; 812. Mating end; 813. Left mating plate; 814. Right mating plate; 815. Rotating shaft; 816. Adjusting groove; 817. Locking end; 818. Releasing end; 819. Positioning rod. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific descriptions of the present invention, and their purpose is to enable those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limitations on the present invention.

[0045] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation 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.

[0046] 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. Example

[0047] like Figure 1-14As shown, a locking mechanism is provided on a swivel chair, which includes a seat 2, chair legs, and a connecting rod 3 connecting the two. The locking mechanism 1 is provided on the seat 2, and the two ends of the connecting rod 3 respectively cooperate with the chair legs and the locking mechanism 1. The locking mechanism 1 includes a fixing module 4 fixed on the seat 2 and an assembly module 5 cooperating with the connecting rod 3. The fixing module 4 and the assembly module 5 are rotatably engaged. The locking mechanism 1 also includes a locking pin 6 movably provided on the fixing module 4. The assembly module 5 includes a positioning part 51, and the locking pin 6 abuts against the positioning part 51 to apply a locking force. In this invention, the rotatable engagement between the fixing module 4 and the assembly module 5 enables the seat to rotate, thus preventing wear between the gas spring components due to rotation. Furthermore, since the gas spring does not need to support the seat's rotation, it will not cause an explosion due to increased temperature or pressure caused by seat rotation, providing a safer user environment. With enhanced safety, users do not need to leave the seat to adjust the rotation, making the swivel chair with this invention more convenient and improving the user experience. Finally, the locking mechanism 1 controls the swivel chair's rotation function through the cooperation of the locking pin 6 and the positioning part 51, allowing the swivel chair to be locked when needed.

[0048] In this invention, the connecting rod 3 is a pneumatic rod. This pneumatic rod only needs to support the lifting and lowering of the seat. Compared to a pneumatic rod that supports both rotation and lifting, it has a simpler structure, fewer parts, and relatively lower manufacturing costs, thus reducing the cost of use. A pneumatic rod that supports both rotation and lifting has a more complex internal structure, needing to withstand the torque generated during rotation and the axial force during lifting, making it more difficult to control changes in internal air pressure and temperature. In contrast, a pneumatic rod that only supports lifting has a relatively simple structure, a single stress condition, and makes changes in internal air pressure and temperature easier to control, greatly reducing the possibility of explosion and providing a safer operating environment for the user.

[0049] In this invention, the fixing module 4 is provided with an assembly space 41 and a locking movable space 42, and a connecting channel 43 connects the assembly space 41 and the locking movable space 42. The assembly module 5 is rotatably disposed within the assembly space 41; the locking pin 6 is movably disposed within the locking movable space 42 and abuts against the positioning part 51 through the connecting channel 43. The fixing module 4's arrangement of the assembly space 41 and the locking movable space 42, connected by the connecting channel 43, fully utilizes the internal space of the fixing module 4, making the entire locking mechanism 1 more compact. This design ensures that the assembly module 5 can be rotatably disposed within the assembly space 41, realizing the swivel chair's rotation function; it also provides sufficient space for the locking pin 6 to move within the locking movable space 42; simultaneously, the connecting channel 43 limits and guides the movement of the locking pin 6, thereby achieving abutment against the positioning part 51 and completing the locking action. This design avoids interference between components and improves space utilization.

[0050] In this embodiment, the moving path of the locking pin 6 corresponds to its length direction, which makes it easier for people to control the locking pin 6 to abut against the positioning part 51 to apply a locking force.

[0051] In this invention, a friction-reducing component 7 is provided between the inner wall of the assembly space 41 and the assembly module 5, with the two respectively engaging with different surfaces of the friction-reducing component 7. The friction-reducing component 7 provides a relatively smooth contact surface, which not only makes the rotation of the assembly module 5 within the assembly space 41 more stable and smooth, but also greatly reduces friction, thereby reducing wear on both and improving durability. Furthermore, the reduced friction makes it easier and less strenuous for the user to rotate the swivel chair, requiring less effort to adjust the sitting posture or change direction, thus improving the convenience and comfort of operation.

[0052] In this invention, the assembly module 5 includes a support tube 52 that connects and cooperates with the connecting rod 3. A mating part 521 extending outwards along its circumference is provided at the center of the outer surface of the support tube 52. The mating part 521 and the top of the support tube 52 are located in the assembly space 41. The mating part 521 provides stable support for the support tube 52, allowing it to maintain the correct position and rotate within the assembly space 41. The bottom of the fixing module 4 has an opening 47 with an inner diameter smaller than that of the mating part 521, allowing the bottom end of the support tube 52 to be exposed. The difference between the diameter of the mating part 521 and the inner diameter of the opening 47 further enhances the assembly stability of the support tube 52. The friction-reducing component 7 is annularly sleeved on the support tube 52, with its upper and lower surfaces abutting against the inner wall of the assembly space 41 and the mating part 521, respectively. The annular shape of the friction-reducing component 7 on the support tube 52 does not occupy excessive space, resulting in a compact overall structure.

[0053] In this invention, the positioning part 51 is fixed in a circular shape to the tube body of the support tube 52 or the mating part 521; locking grooves 511 that mate with the locking pin 6 are distributed circumferentially along the positioning part 51, and the openings of the locking grooves 511 are opened on the outer surface of the positioning part 51; each locking groove 511 is on the same horizontal plane as the connecting channel 43; the movement path of the locking pin 6 and the length direction of the locking grooves 511 are both corresponding to the radial direction of the positioning part 51. The positioning part 51 is fixed in a circular shape to the support tube 52 or the mating part 521, and the locking grooves 511 are distributed circumferentially along it. This design allows the locking pin 6 to mate with the locking grooves 511 in multiple positions, greatly improving the flexibility of locking; when using the swivel chair, people can choose to reliably lock it at the desired position according to real-time needs, meeting the usage requirements for fixing the angle of the swivel chair in different usage scenarios. Each locking slot 511 is on the same horizontal plane as the connecting channel 43, and the moving path of the locking pin 6 and the length direction of the locking slot 511 are corresponding to the radial direction of the positioning part 51. This arrangement allows the locking pin 6 to smoothly enter the locking slot 511 through the connecting channel 43 during the locking process, achieving fast and accurate locking and improving the safety and stability of the swivel chair.

[0054] It is worth noting that the specific number of locking slots 511 can be changed according to the actual needs of the swivel chair.

[0055] In this embodiment, the positioning part 51 is detachably assembled onto the mating part 521 of the support tube 52, and the upper surface of the mating part 521 is provided with an upwardly protruding mounting block 523; the space enclosed by the inner ring of the positioning part 51 is the mounting space 512, and the shape of the mounting space 512 matches the shape of the mounting block 523.

[0056] In this embodiment, the support tube 52 is provided with a mounting through hole 522 extending through its upper and lower ends. The connecting rod 3 mates with the mounting through hole 522. The inner diameter of the mounting through hole 522 near the top of the support tube 52 is smaller than the inner diameter near the bottom of the support tube 52. The end of the connecting rod 3 that connects to the support tube 52 matches the mounting through hole 522, thereby achieving a stable connection between the support tube 52 and the connecting rod 3. Simultaneously, a control switch 31 for controlling the extension and retraction of the connecting rod 3 is provided at its top. The control switch 31 protrudes from the top of the support tube 52 through the mounting through hole 522.

[0057] In this embodiment, the center points of the mounting through hole 522, the mating part 521, and the positioning part 51 are on the same vertical line, which makes the overall structure of the present invention more stable and improves the rotation accuracy.

[0058] This invention also includes an adjustment part 8 for adjusting the engagement relationship between the locking pin 6 and the positioning part 51. The adjustment part 8 includes an adjustment handle 81, with an adjustment end 811 and a mating end 812 at its two ends. The mating end 812 is located in the locking activity space 42 and engages with the locking pin 6. The fixing module 4 is provided with an adjustment opening 44 for the adjustment end 811 to extend out of the locking activity space 42. The adjustment end 811 of the adjustment handle 81 extends out of the adjustment opening 44 of the fixing module 4, allowing the user to directly grasp the adjustment end 811 for operation, thereby conveniently and quickly adjusting the engagement relationship between the locking pin 6 and the positioning part 51, and quickly completing the locking or unlocking operation.

[0059] In this invention, a mounting plate 421 is fixedly installed within the locking movable space 42, and an adjusting handle 81 is positioned between the two mounting plates 421. A left mating plate 813 and a right mating plate 814 are respectively provided on the same surfaces on the left and right sides of the mating end 812. Corresponding rotating shafts 815 are provided on the outer surfaces of the left and right mating plates 813 and 814. The mounting plate 421 is provided with rotating mounting holes 422 that mate with the rotating shafts 815. Corresponding adjusting grooves 816 are provided on the left and right mating plates 813 and 814. The adjusting part 8 includes an adjusting rod 82, which passes through the locking pin 6 and whose two ends are movably located within the adjusting grooves 816 of the left mating plate 813 and the right mating plate 814. The adjusting groove 816 is curved, with a locking end 817 and a releasing end 818 at its two ends. The rotating shaft 815, the locking end 817, and the releasing end 818 are arranged in a right-angled triangle, with the rotating shaft 815 at the vertex of the right angle. The distance between the locking end 817 and the rotating shaft 815 is greater than the distance between the releasing end 818 and the rotating shaft 815. This design allows the adjusting handle 81 to move the adjusting rod 82 within the adjusting groove 816, precisely controlling the degree of engagement between the locking pin 6 and the positioning part 51 according to the curved shape of the adjusting groove 816. Because the distances between the rotating shaft 815 and the locking end 817 and the loosening end 818 are different, when the adjusting rod 82 moves to the locking end 817, the locking pin 6 and the positioning part 51 are tightly engaged to achieve a stable lock; when the adjusting rod 82 moves to the loosening end 818, the engagement between the locking pin 6 and the positioning part 51 is loosened, making it easier to rotate and adjust.

[0060] In this invention, an adjustment groove 61 is provided at one end of the locking pin 6 near the adjusting handle 81; the adjustment groove 61 is arranged along the length direction of the locking pin 6; the adjusting rod 82 passes through the adjustment groove 61; a stop block 62 is provided in the middle of the locking pin 6, and a spring 63 is sleeved on the locking pin 6, with the two ends of the spring 63 abutting against the adjusting rod 82 and the stop block 62 respectively. When the adjusting handle 81 controls the locking pin 6 to move closer to the positioning part 51 for locking, the locking pin 6 can have a certain amount of movement; when the locking pin 6 is not aligned with the opening of the locking groove 511, and the adjusting handle 81 controls the locking pin 6 to lock, the locking pin 6 can retract through this amount of movement, thereby avoiding damage from impact between the locking pin 6 and the positioning part 51. Furthermore, the spring 63 allows the locking pin 6 to exert a force towards the positioning part 51 while having a certain amount of retraction movement, thus allowing it to enter the locking groove 511 when aligned with the opening of the locking groove 511 to complete the locking operation.

[0061] In this utility model, the fixing module 4 includes a fixing base 45 and a fixing cover 46; the fixing base 45 is fixedly installed on the lower surface of the chair seat 2, and the fixing cover 46 is detachably assembled to the fixing base 45 by bolts; the fixing base 45 has a first space 451 and a second space 452, and a connecting groove 453 is provided between the first space 451 and the second space 452 to make them communicate; the fixing cover 46 has a third space 461 and a fourth space 462; the first space 451 and the third space 461 cooperate to form an assembly space 41, and the second space 452 and the fourth space 462 cooperate to form a locking mechanism. Space 42; the mounting plate 421 is fixed to the fixing base 45; it is set on the fixing cover 46 through the opening 47; both the fixing base 45 and the fixing cover 46 are provided with adjustment openings 44 for adjusting the adjustment end 811 of the handle 81 to extend out; the fixing cover 46 is provided with a guide plate 463 corresponding to the connecting groove 453, the guide plate 463 is set in the length direction of the connecting channel 43, and when the fixing base 45 and the fixing cover 46 are engaged, the guide plate 463 is at the groove opening of the connecting groove 453 to form the connecting channel 43; the guide plate 463 is inclined from the end away from the third space 461 to its upper surface. The design of the detachable fixing cover 46 makes the initial installation simpler and more convenient; during the later maintenance, the operator can also easily open the fixing cover 46 to inspect, repair or replace the internal components. When the adjusting handle 81 moves the adjusting rod 82, the guide plate 463 provides precise guidance for the adjusting rod 82, allowing the adjusting rod 82 to move along a predetermined trajectory within the connecting channel 43, thus reducing friction and jamming between the adjusting rod 82 and the guide plate 463.

[0062] In this embodiment, the outer surfaces of the left mating plate 813 and the right mating plate 814 are also provided with positioning rods 819. The mounting plate 421 is provided with locking positioning holes 423 and unlocking positioning holes 424 that cooperate with the positioning rods 819. The end of the positioning rod 819 is hemispherical, and its movement is adjusted according to the adjusting handle 81 to change the working state of the locking pin 6. When the locking pin 6 is in the locked state, the positioning rod 819 is in the locking positioning hole 423; when the locking pin 6 is in the unlocked state, the positioning rod 819 is in the unlocking positioning hole 424. When the positioning rod 819 enters the locking positioning hole 423, it can accurately fix the locking pin 6 in the locked position, preventing it from moving accidentally when subjected to external force, thus ensuring the reliability of the locking function. Similarly, when the positioning rod 819 enters the unlocking positioning hole 424, it can also ensure that the locking pin 6 is accurately in the unlocked state. The hemispherical design of the end of the positioning rod 819 can play a guiding role, making it easier to adjust between the locking positioning hole 423 and the unlocking positioning hole 424 and reducing the difficulty of operation.

[0063] In this embodiment, the fixed base 45 is also equipped with an adjustment lever 454; one end of the adjustment lever 454 is inside the assembly space 41, and the other end is outside for the user to operate; thus, the end of the adjustment lever 454 in the assembly space 41 can trigger the control switch 31 at the top of the connecting rod 3 under the control of the user, thereby enabling the connecting rod 3 to extend and retract to realize the height adjustment of the swivel chair.

[0064] In this utility model, the friction-reducing component 7 is located between the mating part 521 and the fixed seat 45; the upper surface of the friction-reducing component 7 abuts against the fixed seat 45, and the lower surface of the friction-reducing component 7 abuts against the positioning part 51 and / or the mating part 521; in this embodiment, the friction-reducing component 7 is a bearing, with its upper surface abutting against the fixed seat 45 and its lower surface abutting against the positioning part 51 and the mating part 521, thereby realizing the rotation of the support tube 52.

[0065] In this invention, the locking groove 511 is outside the obstruction range of the friction-reducing component 7. This design ensures that the locking pin 6 can smoothly enter the locking groove 511 during the locking process, achieving reliable locking. When a person sits down, gravity is transmitted from top to bottom. The area where the assembly module 5 mainly bears the force is the contact area between the mating part 521 and the fixed seat 45. The friction-reducing component 7 is placed here to fully utilize this force-bearing characteristic and maximize the reduction of friction.

[0066] In this embodiment, the lower surface of the mating part 521 is further provided with a downwardly extending stabilizing block 524, and the inner surface of the fixing cover 46 is provided with a stabilizing groove 48 that mates with the stabilizing block 524; the stabilizing groove 48 communicates with the third space 461; thus facilitating the mating of the stabilizing block 524 and the stabilizing groove 48 during the assembly of the fixing cover 46, thereby improving the working stability. Both the stabilizing block 524 and the stabilizing groove 48 are annular, and their axial directions are consistent, so that the stabilizing block 524 can provide a supporting force after mating with the stabilizing groove 48; this not only makes the assembly between the fixing module 4 and the assembly module 5 more stable and less prone to tilting, but also makes the swivel chair equipped with this utility model less prone to tilting.

[0067] In this embodiment, the center points of the stabilizing block 524, the stabilizing groove 48, the mounting through hole 522, and the opening 47 are on the same vertical line, thereby improving the rotational stability of this utility model.

[0068] It is worth noting that the other technical solutions of this utility model are all existing technologies, and therefore will not be described in detail.

[0069] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A locking mechanism provided on a swivel chair, the swivel chair comprising a seat, a leg and a connecting rod connecting the seat and the leg, the locking mechanism being provided on the seat, the connecting rod being connected to the leg and the locking mechanism at two ends thereof, respectively, characterized in that, The locking mechanism includes a fixing module fixed to the seat and an assembly module that cooperates with the connecting rod, with the fixing module and the assembly module having a rotatable movable engagement; It also includes a locking pin that can be movably mounted on a fixed module; the assembly module includes a positioning part, and the locking pin abuts against the positioning part to apply a locking force.

2. A locking mechanism according to claim 1, wherein, The fixed module is provided with an assembly space and a locking movable space, and a connecting channel is provided between the assembly space and the locking movable space to make them communicate with each other; the assembly module is rotatably set in the assembly space; the locking pin is movably set in the locking movable space and abuts against the positioning part through the connecting channel.

3. A locking mechanism according to claim 2, wherein, Friction-reducing components are provided between the inner wall of the assembly space and the assembly module, and the two respectively mate with different surfaces of the friction-reducing components.

4. A locking mechanism according to claim 3, wherein, The assembly module includes a support tube that connects and mates with the connecting rod; a mating part extending outward in the circumferential direction is provided at the middle of the outer surface of the support tube, and the mating part and the top of the support tube are located in the assembly space; the bottom of the fixing module is provided with an opening with an inner diameter smaller than the diameter of the mating part, allowing the bottom end of the support tube to be exposed; the friction-reducing component is annularly sleeved on the support tube, and the upper and lower surfaces of the friction-reducing component abut against the inner wall of the assembly space and the mating part, respectively.

5. A locking mechanism according to claim 4, wherein, The positioning part is fixed in a circular shape to the tube body or mating part of the support tube; locking grooves that mate with locking pins are distributed along the circumference of the positioning part, and the opening of the locking groove is opened on the outer surface of the positioning part; each locking groove and the connecting channel are on the same horizontal plane; the moving path of the locking pin and the length direction of the locking groove are both corresponding to the radial direction of the positioning part.

6. A locking mechanism according to claim 5, wherein, It also includes an adjustment part that adjusts the relationship between the locking pin and the positioning part; The adjustment part includes an adjustment handle, with an adjustment end and a mating end at its two ends; the mating end is located in the locking movement space and engages with the locking pin; the fixing module is provided with an adjustment opening for the adjustment end to extend out of the locking movement space.

7. A locking mechanism according to claim 6, wherein, An installation plate is fixedly installed within the locked activity space, and the adjustment handle is located between the two installation plates; A left mating plate and a right mating plate are respectively provided on the same surface on the left and right sides of the mating end. Corresponding rotating shafts are provided on the outer surfaces of the left and right mating plates. Rotary mounting holes that mate with the rotating shafts are provided on the mounting plate. The left and right mating plates are provided with corresponding adjustment grooves; the adjustment part includes an adjustment rod that passes through a locking pin and whose two ends are movably located in the adjustment grooves of the left and right mating plates; The adjusting groove is curved, with a locking end and a loosening end at its two ends. The rotating shaft, locking end, and loosening end are arranged in a right-angled triangle, with the rotating shaft at the vertex of the right angle. The distance between the locking end and the rotating shaft is greater than the distance between the loosening end and the rotating shaft.

8. A locking mechanism according to claim 7, wherein, An adjustment groove is provided at the end of the locking pin near the adjustment handle; the adjustment groove is positioned corresponding to the length direction of the locking pin; the adjustment rod passes through the adjustment groove. A stop is provided in the middle of the locking pin, and a spring is sleeved on the locking pin, with the two ends of the spring abutting the adjusting rod and the stop respectively.

9. A locking mechanism according to claim 8, wherein, The fixing module includes a fixing base and a fixing cover; the fixing base is fixedly installed on the lower surface of the chair seat, and the fixing cover is detachably assembled to the fixing base by bolts; the fixing base has a first space and a second space, and a connecting groove is provided between the first space and the second space to make them communicate; the fixing cover has a third space and a fourth space; the first space and the third space cooperate to form an assembly space, and the second space and the fourth space cooperate to form a locking movable space; the mounting plate is fixed to the fixing base; it is set on the fixing cover through an opening; both the fixing base and the fixing cover are provided with adjustment openings for adjusting the extension of the adjustment end of the handle; the fixing cover is provided with a guide plate corresponding to the connecting groove, and the guide plate is set in the length direction of the connecting channel. When the fixing base and the fixing cover are engaged, the guide plate is at the opening of the connecting groove to form the connecting channel; the guide plate is inclined from the end away from the third space to its upper surface.

10. A locking mechanism according to claim 9, characterized in that, The friction-reducing component is located between the mating part and the fixed seat; the upper surface of the friction-reducing component abuts against the fixed seat, and the lower surface of the friction-reducing component abuts against the positioning part and / or the mating part; the locking groove is outside the blocking range of the friction-reducing component.

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