An opening and closing fixing mechanism and a seat

Abstract

The present invention provides an opening and closing fixing mechanism and a seat, relating to the technical field of seats; the opening and closing fixing mechanism includes a housing member and a locking member disposed in the housing member; the housing member is provided with a through channel for the external chair leg to move freely along its opening and closing direction, and the locking member can operably limit the external chair leg in the through channel or release the limitation thereon so that the chair leg can move relative to the housing member; the locking member includes an operating member, a locking member and a limiting member; the operating member can be controlled by an external force to switch and move between its locking position and unlocking position; the locking member is configured to be clamped and limited between the external chair leg and the operating member when the operating member is in the locking position, and move to release the limiting and fixing of the chair leg after the operating member is in the unlocking position; the limiting member is used to limit the operating member at its unlocking position.

Description

Technical Field

[0001] The present invention relates to the technical field of seats, and more particularly, to an opening and closing fixing mechanism and a seat. Background Art

[0002] With the development of society, people's requirements for the comfort of seats in daily production are also getting higher and higher. Nowadays, the conventional seat opening and closing fixing scheme requires a great deal of effort to operate, and when storing and stacking, it is necessary to pat hard, and even damage items, hurt users, etc., which greatly affects the user's comfort experience. Moreover, for the folding seat structures currently on the market, there are a variety of them but their functions are slightly single. Especially for the buckle structure used for switching the opening and closing of chair legs, it is extremely inconvenient to operate during opening and closing, and only relies on the internal locking member for limit fixing, which is extremely easy to cause the locking to be incomplete, resulting in poor stability during use due to folding. In addition, when folding and storing is required, it is extremely easy to be interfered by its buckle structure, affecting the opening and closing of the seat, and the controllability is poor. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an opening and closing fixing mechanism and a seat to solve the above problems.

[0004] The present invention adopts the following scheme:

[0005] The present application provides an opening and closing fixing mechanism suitable for performing opening and closing fixing operations on a seat; the opening and closing fixing mechanism includes a housing member and a buckle member disposed in the housing member; the housing member is provided with a through channel for an external chair leg to move freely along its opening and closing direction, and the buckle member can operably limit the external chair leg in the through channel or release the limitation thereon so that the chair leg can move relative to the housing member; wherein, the buckle member includes a manipulating member, a locking member and a limiting member; the manipulating member can be controlled by an external force to switch and move between its locking position and unlocking position; the locking member is configured to be used for clamping and limiting between the external chair leg and the manipulating member when the manipulating member is in the locking position, and move to release the limit fixing of the chair leg after the manipulating member is in the unlocking position; the limiting member is used for limiting the manipulating member at its unlocking position.

[0006] As a further improvement, it further includes an unlocking member for triggering the limiting member to release the position limitation on the manipulating member; the unlocking member can act on the limiting member after the chair leg moves to a preset position to make it separate from the manipulating member and then implement an unlocking operation, and the housing member is provided with a reset member for automatically returning the manipulating member to its locking position.

[0007] As a further improvement, the unlocking member is configured as a boss structure formed on the movable path of the outer chair leg; the limiting member is constructed to always be elastically maintained on the side tending to the operating member, and it includes a plug-in portion located on the upper side and a contact portion located on the lower side; the operating member is provided with a coupling portion on the side facing the limiting member, and after switching to the unlocking position, the plug-in portion and the coupling portion are connected to each other's holes, and the contact portion is elastically pressed to be damped and adapted to the chair leg.

[0008] As a further improvement, the contact portion is correspondingly arranged on the movable path of the boss structure so that the plug-in portion and the engaging portion are separated from each other after the boss structure pushes out the contact portion, and then after releasing the external force and ensuring that the chair leg moves to its initial position, the operating member is switched to its initial locking position through the reset member.

[0009] As a further improvement, the operating member also includes a handle portion and a pressing portion; the handle portion is exposed to the outer shell and is arranged on the rear end side for the user to hold and pull, and the pressing portion can be pressed and limited with the locking member in the locked position, and avoid each other with the locking member in the unlocked position.

[0010] As a further improvement, the locking element is configured as a transverse pin shaft, and the pin shaft has a margin for movement in the longitudinal direction in the housing element.

[0011] As a further improvement, the outer shell is formed into a box shape by joining a left shell and a right shell; the through channel is formed by depressions on the lower side of the two side shells, and the operating member can be pulled and movably arranged on the upper side of the two side shells.

[0012] As a further improvement, it also includes a guide rail member formed in the two side shells, and at least a part of the through channel suitable for guiding the sliding contact of the chair legs is formed between the guide rail members.

[0013] The present application further provides a seat, comprising a seat body and an opening and closing fixing mechanism configured on the seat body; wherein the seat body is provided with front legs, rear legs, armrests, a seat and a backrest; the outer shell is correspondingly configured at the pivot ends of the seat and the backrest, and one end of the rear leg is hingedly arranged with the armrest and the front leg, wherein the other end is passed through the through channel to limit or move relative to the outer shell, and the opening and closing movement of the seat relative to the front leg is controlled by the corresponding movement of the rear leg on the outer shell, thereby adjusting and controlling the seat to switch its position between its working state and folding state.

[0014] As a further improvement, a positioning member is correspondingly provided on the rear chair leg, which cooperates with the operating member and the locking member, and the positioning member is arranged on the front end side of the housing member to abut and limit the housing member after the operating member is switched to the locking position, so that the rear chair leg is firmly in the working state; and, a slot engaged with the locking member is correspondingly provided on the rear chair leg, and the position where the positioning member abuts and limits is suitable for the locking position of the slot, the locking member and the operating member; and, an unlocking member for triggering the limiting member to release the position limitation on the operating member is correspondingly provided on the rear chair leg, and the unlocking member can follow the rear chair leg in and out of the through channel.

[0015] By adopting the above technical solutions, the following technical effects can be achieved in the present invention:

[0016] 1. For the opening and closing fixing mechanism of the present application, by the relative movement or fixation of the chair legs on the housing member, the opening and closing and fixing operations of the seat structure can be realized. The seat can be easily and conveniently folded and stored without forcefully patting, thus greatly saving manpower. Moreover, the relative movement control of the chair legs in the through channel greatly avoids the direct operation of the user and can significantly reduce the harm of the opening and closing fixing mechanism to the user.

[0017] 2. In the present invention, the locking member arranged on the housing member acts on the operating member through an external force to realize its rapid switching between the locking position and the unlocking position. And when it is in the locking position, the locking member is engaged and limited between the chair leg and the operating member, and the three are mutually limited and cooperate to ensure that the chair leg is more efficiently and firmly in its working state during use. When it is in the unlocking position, in order to avoid the ineffective interference of the operating member on the chair leg and the locking member, the operating member is stably limited at its unlocking position by the limiting member, greatly improving the cooperation of each internal structural member to improve the locking environment.

[0018] 3. Further, in order to ensure that the chair leg switched back to the working state can be fixed by the cooperation of the operating member and the locking member, an unlocking member in the form of a convex platform structure is provided on the movement path of the chair leg, and the unlocking member can trigger the limiting member to release the position limitation on the operating member. After the chair leg moves to the required opening and closing position, the unlocking member acts on the limiting member so that the limiting member is disengaged and unlocked from the operating member, and under the drive of the reset member, it is ensured that the operating member automatically returns to the locking position, and then cooperates with the locking member to perform a fixing operation on the chair leg. By controlling the position switching of the operating member, the opening and closing and fixing of the seat can be realized by the relative reciprocating movement of the chair leg in the through channel.

[0019] 4. The seat of the present application can be switched between its working state and folded state through the mutual pivoting cooperation of various seat components. Among them, the outer shell of the entire opening and closing fixing mechanism is covered and configured at the pivoting end of the seat board and the backrest, which can more effectively prevent pinching of the user when the seat is switched, and will not directly contact the user, nor cause discomfort to the human body during use, which can significantly improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the opening and closing fixing mechanism according to an embodiment of the present invention;

[0021] Figure 2 is a partial disassembled schematic diagram of the application scenario of the opening and closing fixing mechanism according to an embodiment of the present invention, where, for the convenience of display, a partial enlarged view is shown;

[0022] Figure 3 is Figure 2 a schematic structural diagram from another perspective;

[0023] Figure 4 is Figure 2 a schematic structural diagram from other perspectives;

[0024] Figure 5 is a partial disassembled schematic diagram of the opening and closing fixing mechanism according to an embodiment of the present invention;

[0025] Figure 6 is Figure 5 a schematic structural diagram from one of the perspectives;

[0026] Figure 7 is Figure 5 a schematic structural diagram from another one of the perspectives;

[0027] Figure 8 is a schematic structural diagram of the seat according to an embodiment of the present invention;

[0028] Figure 9 is Figure 8 a schematic structural diagram from other perspectives;

[0029] Figure 10 is a partial disassembled schematic diagram of the seat according to an embodiment of the present invention, where, for the convenience of display, a partial enlarged view is shown;

[0030] Figure 11 is a partial structural diagram of the seat according to an embodiment of the present invention;

[0031] Figure 12 is Figure 11 a schematic structural diagram from another perspective.

[0032] Icon: 1 - housing part; 11 - left shell; 12 - right shell; 13 - guide rail part; 2 - operating part; 21 - joint part; 22 - handle part; 23 - pressing part; 24 - mounting part; 3 - locking part; 4 - limiting part; 41 - plugging part; 42 - contact part; 5 - unlocking part; 6 - reset part; 7 - spring; 8 - seat body; 81 - front chair leg; 82 - rear chair leg; 821 - positioning part; 822 - slot; 83 - armrest; 84 - seat board; 85 - backrest. Detailed implementation mode

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] Embodiment

[0035] Combined with Figures 1 to 7 , this embodiment provides a folding and fixing mechanism, which is suitable for performing folding and fixing operations on a seat. The folding and fixing mechanism includes a housing part 1 and a locking component arranged on the housing part 1. The housing part 1 is provided with a through channel for the external chair legs to move freely along its opening and closing direction, and the locking component can operably limit the external chair legs in the through channel or release the limitation on them so that the chair legs can move relative to the housing part 1. Among them, the locking component includes an operating part 2, a locking part 3 and a limiting part 4. The operating part 2 can be controlled by an external force to switch between its locking position and unlocking position. The locking part 3 is configured to be used for clamping and limiting between the external chair legs and the operating part 2 when the operating part 2 is in the locking position, and to move to release the limiting and fixing of the chair legs after the operating part 2 is in the unlocking position. The limiting part 4 is used to limit the operating part 2 at its unlocking position.

[0036] For the above folding and fixing mechanism, through the relative movement or fixation of the chair legs on the housing part 1, the folding and fixing operation of the seat structure can be realized. Without the need to slap hard, the seat can be easily and conveniently folded and stored, thus greatly saving manpower. Moreover, the relative movement control of the chair legs in the through channel greatly avoids the direct operation of users and can significantly reduce the harm of the folding and fixing mechanism to users.

[0037] In particular, the locking member disposed on the housing member 1 acts on the operating member 2 by an external force, thereby achieving a quick switch between its locked position and unlocked position. Moreover, when it is in the locked position, the locking member 3 is engaged and limited between the chair leg and the operating member 2, and the three are mutually limited and cooperated to ensure that the chair leg is more efficiently stabilized in its working state during use. When it is in the unlocked position, in order to avoid further ineffective interference of the operating member 2 with the chair leg and the locking member 3, the operating member 2 is stably limited at its unlocked position by the limiting member 4, greatly improving the cooperation of each internal structural member to improve the locking environment.

[0038] As Figure 3 shown, in this embodiment, the opening and closing fixing mechanism further includes an unlocking member 5 for triggering the limiting member 4 to release the position limitation of the operating member 2. The unlocking member 5 can act on the limiting member 4 after the chair leg moves to a preset position to make it disengage from the operating member 2 and then perform an unlocking operation, and the housing member 1 is provided with a reset member 6 for automatically returning the operating member 2 to its locked position. Among them, the reset member 6 is preferably a compression spring 7, and both ends of the spring 7 are respectively butted between the operating member 2 and the housing member 1, so as to provide a reset movement for the operating member 2 after releasing the compressed energy storage.

[0039] Furthermore, as Figure 2 、 Figure 3 and Figure 6 shown, the unlocking member 5 is configured to form a boss structure on the movement path of the external chair leg. The limiting member 4 is configured to always be elastically held on the side tending to the operating member 2, and it includes a plugging portion 41 on the upper side and a contact portion 42 on the lower side. A joint portion 21 is provided on the side of the operating member 2 facing the limiting member 4. After switching to the unlocked position, the plugging portion 41 and the joint portion 21 are docked with each other in hole positions, and the contact portion 42 is elastically pressed to be damped and adapted to the chair leg. In this embodiment, specifically, it can be achieved by a spring 7 elastically disposed between the limiting member 4 and the housing member 1, so as to realize that the limiting member 4 always maintains an elastic pressing trend towards the operating member 2. Preferably, the plugging portion 41 is configured as a horizontal axis, and the joint portion 21 is correspondingly configured as a slot hole suitable for inserting the horizontal axis.

[0040] When the operating member 2 and the limiting member 4 are limited and locked, at this time, it is beneficial for the chair leg to move and adjust its position in the through-channel. At the same time, the contact portion 42 of the limiting member 4 can extend into the through-channel to directly contact the chair leg, so that the chair leg is subjected to damping friction during the movement process, thereby improving the operability during the opening and closing of the chair leg and greatly adding the user experience during the use process.

[0041] In the above, in order to ensure that the chair legs can be fixed by the operating member 2 and the locking member 3 when switching back to the working state, an unlocking member 5 in the form of a boss structure is provided on the movable path of the chair legs, and the unlocking member 5 can trigger the limit member 4 to contact the position limit of the operating member 2. After the chair legs move to the required opening and closing position, the unlocking member 5 acts on the limit member 4 so that the limit member 4 is disengaged and unlocked from the operating member 2, and under the drive of the reset member 6, the operating member 2 is ensured to automatically return to the locked position, and then cooperates with the locking member 3 to fix the chair legs. By controlling the position switching of the operating member 2, the chair legs can be reciprocated in the relative through-channel to realize the opening and closing of the seat.

[0042] It should be pointed out that, in the present embodiment, the unlocking member 5 is preferably arranged on the chair leg so as to eject and trigger the unlocking member 5 to disengage and unlock when the chair leg moves. For details, please refer to the relevant description of the seat below.

[0043] In this embodiment, the contact portion 42 is correspondingly arranged on the movable path of the boss structure, so that the plug-in portion 41 and the joint portion 21 are separated from each other after the boss structure pushes out the contact portion 42, and then after releasing the external force and ensuring that the chair leg moves to the initial position (working state), the operating member 2 is switched to its initial locking position through the reset member 6. It should be understood that after the external force is released, the operating member 2 can be driven by the reset member 6 to return to the housing member 1, and at this time it cannot be guaranteed that the operating member 2 can return to its initial position to assist in locking the chair leg, but it must be when the chair leg moves to its working state, at this time, the chair leg, the locking member 3 and the operating member 2 return to the initial locking position, thereby achieving the limit stability of the chair leg in the working state.

[0044] like Figures 3 to 7 As shown, in this embodiment, the operating member 2 also includes a handle portion 22 and a pressing portion 23. The handle portion 22 is exposed to the outer shell 1 and is arranged at the rear end side (relative to the rear end for the user to sit and use) which is convenient for the user to hold and pull. The pressing portion 23 can be pressed and limited with the locking member 3 in the locked position, and avoid each other with the locking member 3 in the unlocked position. Among them, the pressing portion 23 is relatively protruded and arranged on the lower end surface of the operating member 2. When the handle portion 22 of the operating member 2 is not pulled by an external force, the pressing portion 23 presses the locking member 3 into the chair leg in the longitudinal direction, thereby limiting the relative movement of the chair leg along the outer shell 1. After the handle portion 22 of the operating member 2 is pulled by an external force, the pressing member moves accordingly to be away from the locking member 3. At this time, the locking member 3 is not constrained by the pressing of the pressing portion 23, thereby releasing the lock on the chair leg, allowing the chair leg to move and adjust its opening and closing position.

[0045] It should be noted that, in this embodiment, the operating member 2 extends outwardly at its front end to form a mounting portion 24, and the reset member 6 is received in the mounting position of the housing member 1. One end of the reset member 6 abuts against the mounting portion 24 to provide an elastic restoring force to the operating member 2 in the direction opposite to the pulling force.

[0046] In this embodiment, the locking member 3 is configured as a horizontally arranged pin shaft, and the pin shaft has a margin for longitudinal movement in the housing member 1. Specifically, the pin shaft is horizontally defined in the housing member 1 and is only allowed to move in its longitudinal margin when not restricted by the operating member 2, so as to effectively avoid the relatively moving chair legs, enabling the chair legs to move to the overlapping state for storage. When the seat is needed to be used, the chair legs correspondingly move to their working state. At this time, the operating member 2 is reset to its initial position without external force, so that its pressing member further presses the pin shaft longitudinally to snap the pin shaft into the chair legs, realizing the locking of the seat in the working state.

[0047] As Figures 5 to 7 shown, in this embodiment, the housing member 1 is formed by joining a left housing 11 and a right housing 12 into a box shape. The through-channel is formed by recessing the two side housings on the lower side, and the operating member 2 is slidably arranged above the two side housings. Among them, the housing member 1 further includes guide rail members 13 formed in the two side housings. At least a part of the through-channel suitable for guiding and sliding contact of the chair legs is formed between the guide rail members 13. Thus, the two guide rail members 13 form an arc-shaped sliding contact surface conducive to the movement of the chair legs after the side housings are butted, further improving the efficient sliding of the chair legs in the through-channel. In addition, the chair legs and the operating member 2 are vertically opposed to each other in the housing member 1 to achieve a reasonable layout, and the operating member 2 arranged on the upper side is more conducive to the user's hand-held pulling operation.

[0048] Combined with Figures 8 to 12 , this embodiment further provides a seat, including a seat body 8 and an opening and closing fixing mechanism configured on the seat body 8. Among them, the seat body 8 is provided with a front chair leg 81, a rear chair leg 82, as well as an armrest 83, a seat board 84 and a backrest 85. The housing member 1 is correspondingly configured at the pivot ends of the seat board 84 and the backrest 85, and one end of the rear chair leg 82 is hinged to the armrest 83 and the front chair leg 81, and the other end thereof passes through the through-channel to be limited or movable relative to the housing member 1, and the opening and closing movement of the seat board 84 relative to the front chair leg 81 is controlled by the corresponding movement of the rear chair leg 82 on the housing member 1, so as to adjust and control the switching of the seat between its working state and the overlapping state. It should be understood that only after the rear chair leg 82 moves relative to the housing member 1 so that each chair leg can be rotated and stored, can the seat body 8 be switched to the overlapping state to ensure a reasonable switching control between the two states. In this embodiment, the front chair leg, the rear chair leg, the seat board and the backrest of the seat body 8 are substantially stacked in an N shape.

[0049] Thus, through the mutual pivoting cooperation between the various seat components, the seat can be switched between its working state and folded state for use. Among them, the outer shell member 1 of the entire opening and closing fixing mechanism is covered and configured at the pivoting end of the seat board 84 and the backrest 85, which can more effectively prevent pinching of the user when the seat is switched for use, and will not come into direct contact with the user, nor cause discomfort to the human body during use, and can significantly improve the user experience.

[0050] As Figure 10 and Figure 11 shown, in this embodiment, the rear chair leg 82 is correspondingly provided with a positioning member 821 that cooperates with the operating member 2 and the locking member 3, and the positioning member 821 is configured on the front end side of the outer shell member 1 (the front end relative to the user's sitting and using), so as to abut and limit the outer shell member 1 after the operating member 2 is switched to the locking position, making the rear chair leg 82 stable in the working state. Preferably, the positioning member 821 is a snap protrusion, thereby further defining the threshold value during the opening and closing movement of the chair leg. Obviously, after the snap protrusion abuts against the outer shell member 1, the fixed position of the rear chair leg 82 during work is defined at this time. And, the rear chair leg 82 is driven to move to the folded position during storage along the direction away from the snap protrusion.

[0051] Among them, the rear chair leg 82 is correspondingly provided with a slot 822 that is engaged with the locking member 3, and the position defined by the abutment of the positioning member 821 is suitable for the locking position of the slot 822, the locking member 3 and the operating member 2. In this embodiment, the slot 822 extends along the width direction of the rear chair leg 82 and is recessed and configured on the end face of the chair leg, and the depth of the slot 822 is less than the radius of the pin shaft of the locking member 3, so that the pin shaft can be quickly clamped in it by the pressing portion 23 after being aligned with the slot 822. And, the position where the slot 822 is opened on the chair leg is determined by the position of the chair leg defined by the positioning member 821 during work, thereby greatly improving the locking accuracy of the locking member 3, the operating member 2 and the chair leg.

[0052] Among them, the rear chair leg 82 is correspondingly provided with an unlocking member 5 for triggering the limiting member 4 to release the position limitation of the operating member 2, and the unlocking member 5 can follow the rear chair leg 82 in and out of the through channel. In this embodiment, the unlocking member 5 is configured on the rear chair leg 82 and directly follows the opening and closing movement of the rear chair leg 82 in and out of its through channel. After entering the through channel, the convex platform structure formed by the unlocking member 5 can push out its contact portion 42 outward after facing the limiting member 4, thereby pushing the limiting member 4 out of the operating member 2, so that the two are disengaged and unlocked from each other, and further releasing the locking of the limiting member 4 on the operating member 2 in the outer shell member 1. When the operating member 2 needs to avoid the movement of the chair leg, the operating member 2 is limited and fixed, and when the operating member 2 needs to be pressed to lock the chair leg to limit its movement, the limit on the operating member 2 is released, which can significantly improve the associated operation and cooperative cooperation of each internal component.

[0053] Among the above, the unlocking member 5 and the positioning member 821 disposed on the rear chair leg 82 are spaced apart from each other on the same side of the rear chair leg 82, and the height of the boss structure of the unlocking member 5 is less than the height of the engaging protrusion of the positioning member 821. The size of the rear chair leg 82 is smaller than the size of the through-channel, and it is ensured that the engaging protrusion disposed on the chair leg is higher than the gap between the chair leg and the through-channel, and the boss structure disposed on the chair leg is shorter than the gap between the chair leg and the through-channel, so as to realize the abutting and limiting of the positioning member 821 on the housing member 1 and the free entry and exit of the unlocking member 5 within the housing member 1.

[0054] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention.

Claims

1. An opening and closing fixing mechanism is adapted to perform opening and closing fixing control on a seat; the opening and closing fixing mechanism includes a housing member and a locking member disposed in the housing member; characterized in that, The outer shell is provided with a through passage for the outer chair leg to move freely along its opening and closing direction, and the locking member can be operated to limit the outer chair leg in the through passage, or release the limit to allow the chair leg to move relative to the outer shell; wherein, The locking component comprises a manipulation member, a locking member and a limiting member; The operating member can be controlled by external force to switch between its locking position and unlocking position; The locking member is configured to be used for clamping and limiting between the outer chair leg and the operating member when the operating member is in the locking position, and to move to release the limiting fixation of the chair leg after the operating member is in the unlocking position; The limiting member is used to limit the operating member to its unlocking position; The limiter is constructed to always be elastically maintained on the side of the operating member, and comprises a plug-in portion located on the upper side and a contact portion located on the lower side; a joint portion is provided on the side of the operating member facing the limiter, and after switching to the unlocking position, the plug-in portion and the joint portion are connected to each other in the hole position, and the contact portion is elastically pressed to be damped and adapted to the chair leg; The locking element is configured as a transverse pin shaft, and the pin shaft has a margin for movement in the longitudinal direction in the housing element.

2. The opening and closing fixing mechanism according to claim 1, characterized in that, It also includes an unlocking member for triggering the limit member to release the position limit of the operating member; the unlocking member can act on the limit member after the chair leg moves to a preset position to separate it from the operating member and then implement an unlocking operation, and the shell member is provided with a reset member for providing the operating member with automatic return to its locked position.

3. The opening and closing fixing mechanism according to claim 2, characterized in that, The unlocking member is configured as a boss structure formed on a movable path of the outer chair leg.

4. The opening and closing fixing mechanism according to claim 1 or 3, characterized in that, The contact portion is correspondingly arranged on the movable path of the boss structure, so that the plug-in portion and the engaging portion are separated from each other after the boss structure pushes out the contact portion, and then after releasing the external force and ensuring that the chair leg moves to the initial position, the operating member is switched to its initial locking position through the reset member.

5. The opening and closing fixing mechanism according to claim 1, characterized in that, The operating member also includes a handle portion and a pressing portion; the handle portion is exposed to the outer shell and is arranged on the rear end side for the user to hold and pull, and the pressing portion can be pressed and limited with the locking member in the locked position, and avoid each other with the locking member in the unlocked position.

6. The opening and closing fixing mechanism according to claim 1, characterized in that, The outer shell is formed into a box shape by joining a left shell and a right shell; the through channel is formed by recessing the two side shells at the lower side, and the operating member can be pulled and movably arranged at the upper side of the two side shells.

7. The opening and closing fixing mechanism according to claim 6, characterized in that, It also includes a guide rail member formed in the two side shells, and at least a portion of the through channel suitable for guiding the sliding contact of the chair legs is formed between the guide rail members.

8. A seat, characterized in that, It comprises a seat body and an opening and closing fixing mechanism as described in any one of claims 1 to 7 which is arranged on the seat body; wherein the seat body is provided with front legs, rear legs, armrests, a seat and a backrest; the outer shell is correspondingly arranged at the pivot ends of the seat and the backrest, and one end of the rear leg is hinged to the armrest and the front leg, wherein the other end is passed through the through channel to limit or move relative to the outer shell, and the opening and closing movement of the seat relative to the front leg is controlled by the corresponding movement of the rear leg on the outer shell, thereby adjusting and controlling the seat to switch its position between its working state and folding state.

9. The seat according to claim 8, characterized in that, The rear chair legs are correspondingly provided with positioning members cooperating with the operating member and the locking member, and the positioning members are arranged on the front end side of the outer shell member so as to abut against and limit the outer shell member after the operating member is switched to the locking position, so that the rear chair legs are stabilized in the working state.

10. The seat according to claim 9, characterized in that, The rear chair legs are provided with corresponding slots for engaging with the locking member, and the positioning member abuts to define a locking position suitable for the slot, the operating member and the locking member; The rear chair legs are correspondingly provided with unlocking members for triggering the limiting members to release the position limitation of the operating members, and the unlocking members can follow the rear chair legs to enter and exit the through channel.

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