Locking mechanism for left-right inclined swing of chair seat

Abstract

The utility model discloses a locking mechanism for left-right inclined swing of a chair seat, which is characterized in that a locking block is arranged between a swing seat and a base on the basis that the original swing seat can obliquely swing left and right relative to a chassis, and a swing gap is filled or released through the reciprocating motion of the locking block. Therefore, the locking mechanism is switched between a locking state and an unlocking state, and the swing seat can swing or keep horizontal. According to the structure, the chassis space is reasonably utilized, and the production and manufacturing cost is saved; and the user can select the seat to incline and swing left and right according to own needs so as to improve the sitting posture and relieve long-time sitting fatigue, or keep the seat horizontal in the transverse direction, so that the use body feeling of the user is improved.

Description

Technical Field

[0001] The utility model relates to a chair, in particular to a locking mechanism for the chair seat to tilt and swing left and right. Background Art

[0002] Currently, chair manufacturers are adding functions such as adjustable backrests, adjustable lumbar supports, dynamic seats, and other functions to improve user sitting comfort.

[0003] The existing dynamic seat includes a cushion, a chassis, a gas rod and a backrest, etc. The chassis is used to connect the cushion and support the weight of the user. The chassis includes a bracket, a connector, a swing frame and a base, wherein the base is located at the bottom of the chassis and is fixed in position, the connecting bracket is located above the chassis and the upper surface is connected to the cushion, the connector includes a crank and a connecting plate arranged along the front and rear direction of the base and connected as a whole, the connecting plate is connected to the seat back, the crank is tilted, the lower end of the crank is hinged to the base and the swing seat, the upper end of the crank is hinged to one end of the bracket, and the other end of the bracket is in a limit groove, the bracket seat can be raised and lowered relative to the base; the swing frame is hinged to the base in the middle position, so that the swing frame, the connector and the bracket can tilt and swing relative to the base.

[0004] Therefore, the seat can not only rise and fall as the user leans forward or backward, thereby reducing the uncomfortable "back rubbing feeling" of the backrest on the user's back caused by the seat not being able to rise when the user leans back; the seat can also swing left and right as the user's body leans left or right, to prevent the user from sitting in the same posture for a long time, which will put great pressure on the spine and cause discomfort or even symptoms over time.

[0005] In the case where the seat can swing left and right, when the user does not need the seat to swing left and right, a locking mechanism needs to be provided on the seat to meet the user's need to adjust whether the seat swings left and right at any time. Summary of the invention

[0006] The purpose of the utility model is to overcome the deficiencies in the above-mentioned prior art and to provide a locking mechanism for the chassis to tilt and swing left and right. A toggle device is arranged between the swing seat and the base. The toggle device toggle the locking member to move back and forth, allowing the locking member to fill or release the swing space of the swing seat, thereby realizing the locking or unlocking of the chassis to tilt and swing left and right.

[0007] The technical solution of the utility model is achieved in this way:

[0008] The locking mechanism for the chassis to tilt and swing left and right comprises a base and a swinging base hinged to the base at a middle position, the swinging base can tilt and swing left and right relative to the base and a swinging gap is formed between the swinging base and the base, and also comprises a toggle device and a locking piece, the locking piece is arranged between the swinging base and the base, the locking piece is movably installed on any one of the swinging base and the base, the toggle device toggle the locking piece to move back and forth to make the locking mechanism switch between a locked state and an unlocked state, when the toggle device toggle the locking piece to move in one direction, the locking piece at least fills a part of the swinging gap and the swinging base and the base simultaneously form abutment with the locking piece, the swinging base is locked and cannot tilt and swing left and right, and the locking mechanism is in a locked state; when the toggle device toggle the locking piece to move in the opposite direction, the swinging gap is released and the locking piece no longer simultaneously abuts with the swinging base and the base, the swinging base can tilt and swing left and right, and the locking mechanism is in an unlocked state.

[0009] A locking block is arranged between the swing seat and the base, and the reciprocating movement of the locking block is used to fill or release the swing gap, so that the locking mechanism is switched between a locked state and an unlocked state; when sitting, the user can choose to tilt the chassis seat left and right to relieve fatigue from sitting for a long time, or keep the swing seat horizontal without swinging according to their needs. In addition, this structural setting not only saves space but also saves production costs.

[0010] Preferably, the locking member and the swing seat or base are relatively fixed in the longitudinal direction, and the locking member can move relative to the swing seat or base along the front-rear direction of the base. The locking member is fixed relative to the swing seat or base in the longitudinal direction, but can move relative to the swing seat or base along the front-rear direction of the base, and the swing gap can be filled or released by the locking member, so that the swing seat can be switched between the locked and unlocked states by tilting and swinging left and right.

[0011] Preferably, the locking member is attached to the swing seat and the locking member slides forward and backward relative to the swing seat under the action of the toggle device; a boss for abutting the locking member is fixed on the base, and when the locking member slides to the boss position, the locking member and the boss form an upper and lower abutment, and the locking mechanism enters the locked state; when the locking member slides to leave the boss, the locking mechanism enters the unlocked state. The boss is arranged on the base, so that there is a height difference between the swing seat and the base, and the locking member can enter or leave the boss position, so that the locking mechanism can switch between the locked state and the unlocked state.

[0012] Preferably, the base includes a bottom plate and side plates extending upward along the left and right sides of the bottom plate, a bridge plate is provided at the front of the upper end of the side plate, and a portion of the bridge plate between the two side plates forms a boss. The boss is provided on the base to facilitate the locking of the locking mechanism and also make the locking mechanism compact.

[0013] Preferably, locking support plates extend from both sides of the locking member. When the locking member moves to a position that fits with the boss, the bottom surface of the locking support plate contacts the upper surface of the boss, and there is no swing gap between the swing seat and the base, so the swing seat is locked and cannot swing. Providing a locking support plate can reduce the weight of the locking member, which saves costs on the one hand, and can make the toggle device toggle smoothly on the other hand.

[0014] Preferably, the swing seat has a downward inner surface, the locking member is attached to the inner surface of the swing seat, the locking member is provided with a fixing hole, the swing seat is provided with a through limiting hole, the fixing screw passes through the limiting hole and is connected to the fixing hole, the nut of the fixing screw abuts against the outer surface of the swing seat to hang the locking member below the inner surface of the swing seat, and the locking member moves forward and backward relative to the swing seat and the base along the limiting hole. The fixing screw passes through the limiting hole and is connected to the fixing hole, and the locking member is hung below the inner surface of the swing seat, and the locking member moves forward and backward relative to the swing seat and the base along the limiting hole; this method has a simple structure and is easy to process, and it is easy to realize that the locking member is fixed longitudinally relative to the swing seat, but can move relative to the swing seat or the base along the front and rear direction of the base.

[0015] Preferably, the boss has a slope, the boss is low at one end that meets the locking member, and the bottom surface of the locking support plate also has a slope that matches the boss. The matching slope setting of the boss and the locking support plate plays a guiding role, so that the locking member enters the boss position smoothly.

[0016] Preferably, the width of the locking member is smaller than the width of the swing seat or base at the location; the width of the boss is smaller than the width of the swing seat or base at the location. The side walls of the swing seat and the base are staggered up and down, and the width of the locking member and the boss are respectively smaller than the width of the swing seat or the base, so as not to affect the normal swing of the swing seat relative to the base.

[0017] Preferably, the toggle device includes a support frame, and the support frame is fixed on either the swing seat or the base. The toggle device can be fixed on either the swing seat or the base, and the fixed position of the toggle device can be selected according to the actual structural design of the chassis, thereby determining the direction arrangement of the locking member and the boss.

[0018] Preferably, the toggle device also includes a torsion spring and a torsion spring control device, an outer sleeve and a pull wire that can be telescopically moved in the outer sleeve, the outer sleeve is installed on the support frame, the part of the pull wire exposed from the outer sleeve is connected to a ball head, a compression spring is also provided between the ball head and the support frame, the compression spring is arranged along the direction in which the pull wire extends, a torsion spring is provided on the side of the compression spring, the torsion spring loop is sleeved on the column head, the column head is fixed on any surface of the swing seat and the base in the same direction as the torsion spring control device, the torsion spring has elastic arm one and elastic arm two, the elastic arm one and The ball head is in contact, and the second elastic arm is bent through the movable hole reserved on the inner surface of the swing seat or the upper surface of the base and then inserted into the reserved dial hole on the locking member; when the pull line moves in the shortening direction, the ball head drives the first elastic arm to rotate while the compression spring is compressed to generate a reset elastic force, and the second elastic arm drives the locking member away from the boss, so that the swing seat can tilt and swing left and right; when the pull line is released, that is, moves in the lengthening direction, the compression spring releases the elastic force to help the ball head and torsion spring to reset, and the torsion spring drives the locking member to fit up and down with the boss, and the swing seat is locked and cannot swing. The torsion spring control device adopts a wire control method, which can reasonably and effectively utilize the chassis space. Due to the flexibility of the wire control, the terminal switch can be integrated with the seat gas rod lifting switch according to actual conditions; when the wire control wire is extended or shortened, the ball head or the compression spring elastic reset force drives the torsion spring to rotate, thereby driving the locking member to move back and forth, so that the locking mechanism can switch between the locked state and the unlocked state.

[0019] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0020] This technical solution is based on the fact that the original swing seat can tilt and swing left and right relative to the chassis, and a locking block is set between the swing seat and the base. The reciprocating movement of the locking block is used to fill or release the swing gap, so that the locking mechanism can be switched between a locked state and an unlocked state, so that the swing seat can swing or remain horizontal.

[0021] This structural setting rationally utilizes the chassis space to save manufacturing costs; users can also choose to tilt the seat left and right according to their own needs to improve their sitting posture and relieve fatigue from sitting for a long time, or keep the seat horizontally to enhance the user's experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of the chassis of the utility model;

[0023] Figure 2 It is an exploded schematic diagram of the chassis of the utility model;

[0024] Figure 3 It is a three-dimensional schematic diagram of the support plate seat of the chassis of the utility model in the rising state;

[0025] Figure 4 It is a schematic diagram of a horizontal plane of the swing seat of the chassis of the utility model;

[0026] Figure 5 It is a schematic plan view of the swing seat of the chassis of the utility model in a left-leaning state;

[0027] Figure 6 It is a plan view of the swing seat of the chassis of the utility model in a right-leaning state;

[0028] Figure 7 It is an overall schematic diagram of the locking mechanism of the utility model;

[0029] Figure 8 It is an exploded schematic diagram of the locking mechanism of the utility model;

[0030] Fig. 9 It is a three-dimensional schematic diagram of the locking mechanism of the utility model in a locked state (excluding the two side plates of the swing seat);

[0031] Fig.10 It is a three-dimensional schematic partial cross-sectional view of the locking mechanism of the utility model in a locked state;

[0032] Fig.11 It is a side partial cross-sectional view of the locking mechanism of the utility model in a locked state;

[0033] Fig.12 It is a three-dimensional schematic diagram of the locking mechanism of the utility model in the unlocked state (excluding the two side plates of the swing seat);

[0034] Fig.13 It is a three-dimensional schematic partial cross-sectional view of the locking mechanism of the utility model in a locked state;

[0035] Fig.14 It is a side partial cross-sectional view of the locking mechanism of the utility model in a locked state.

[0036] The figures are marked as follows: base 1; boss 101; bottom plate 102; side plate 103; bridge plate 104; waist-shaped hole 105; swing seat 2; support frame 201; limit hole 202; movable hole 203; toggle device 3; torsion spring 301; elastic arm one 3011; elastic arm two 3012; torsion spring control device 302; outer sleeve 3021; ​​pull wire 3022; ball head 3023; column head 303; compression spring 304; locking member 4; locking support plate 401; fastening hole 402; fastening screw 403; toggle hole 404; connecting member 5; crank 501; connecting plate 502; first pin shaft 6; second pin shaft 7; third pin shaft 8; slide groove guiding mechanism 9; slide groove 901; support plate seat 10; support plate 1001; vertical plate 1002. DETAILED DESCRIPTION

[0037] The utility model is further described below with reference to a specific embodiment. In order to alleviate the discomfort of users who sit for a long time, the chair manufacturer has designed a dynamic chassis. The tray seat of the chassis can rise and fall as the user leans on or leaves the chair back. The tray seat can also tilt and swing left and right. However, when the user does not need the tray seat to swing left and right, a locking mechanism is required to lock the left and right swing of the tray seat.

[0038] Based on the above reasons, the locking mechanism between the chassis and the chassis swinging left and right in this embodiment, such as Figure 1-14 As shown, the chassis includes a base 1, a tray seat 10 for supporting a seat, and a connector 5 for connecting a chair back, wherein the connector 5 includes a crank 501 and a connecting plate 502 which are arranged along the front-to-back direction of the base 1 and connected as one body; the chassis also includes a swing seat 2 which is arranged between the base 1 and the tray seat 10.

[0039] Specific instructions, such as Figure 1 , Figure 2 and Figure 3 As shown, the crank 501 is in an inclined state, and the upper end of the crank 501 is hinged to the support plate seat 10 through the third pin 8; the lower end of the crank 501 is hinged to the swing seat 2 through the first pin 6; a slide guide mechanism 9 is provided between the support plate seat 10 and the swing seat 2 to guide the lifting of the support plate seat 10, the support plate seat 10 includes a support plate 1001 and vertical plates 1002 hanging down on the left and right sides of the support plate 1001, the slide guide mechanism 9 includes a limiting slide 901 and a second pin 7, the limiting slide The groove 901 is formed on one of the vertical plate 1002 or the swing seat 2, and the second pin shaft 7 is connected to the other of the vertical plate 1002 or the swing seat 2, and the second pin shaft 7 is inserted into the limiting slide groove 901. The connecting plate 502 is connected to the seat back. When the connecting plate 502 drives the crank 501 to rotate synchronously, the support plate seat 10 rises and falls, and the second pin shaft 7 and the limiting slide groove 901 slide relative to each other, that is, the seat can rise and fall adaptively according to the user's weight when the user leans on or leaves the chair back.

[0040] Further explanation, on the basis that the support plate seat 10 can adapt to the user's weight and can be raised and lowered as the user leans on or leaves the chair back, a swing seat 2 is set between the base 1 and the support plate seat 10; the swing seat 2 is rotatably connected to the base 1 on the left-right symmetrical center line of the base 1, and when the swing seat 2 is tilted and swung left and right relative to the base 1, a swing gap is formed between the swing seat 2 and the base 1, so that Figure 5 and Figure 6 As shown, the swing seat 2 as a whole can tilt and swing left and right relative to the base 1; in order to limit the swing range of the swing seat 2 and prevent the swing seat 2 from hitting the base 1 and producing abnormal noise, waist-shaped holes 105 are preset on the left and right sides of the base 1, and the first pin shaft 6 passes through the waist-shaped holes 105. When the swing seat 2 swings left and right, the first pin shaft 6 moves up and down in the waist-shaped holes 105.

[0041] Furthermore, a locking mechanism for the chassis to tilt and swing left and right is provided, such as Figure 7 and Figure 8 As shown, in addition to the above-mentioned base 1 and swing seat 2, the locking mechanism also includes a toggle device 3 and a locking member 4. The locking member 4 is arranged between the swing seat 2 and the base 1. The toggle device 3 is used to toggle the locking member 4 to move back and forth so that the locking mechanism can be switched between a locked state and an unlocked state.

[0042] Specific instructions, such as Figure 8 As shown, the swing seat 2 has an inner surface facing downward, and a through limiting hole 202 is provided on the swing seat 2. Locking support plates 401 extend on both sides of the locking member 4. A fixing hole 402 is also provided on the locking member 4. The fixing screw 403 passes through the limiting hole 202 and is connected with the fixing hole 402. The nut of the fixing screw 403 abuts against the outer surface of the swing seat 2 to hang the locking member 4 and fit it under the inner surface of the swing seat 2. Therefore, the locking member 4 and the swing seat 2 remain relatively fixed in the longitudinal direction, and the locking member 4 can also move forward and backward along the limiting hole 202 relative to the swing seat 2; the base 1 includes a bottom plate 102 and side plates 103 extending upward along the left and right sides of the bottom plate 102, a bridge plate 104 is arranged at the front position of the upper end of the side plate 103, and a boss 101 is formed on the bridge plate 104 between the two side plates 103, and the boss 101 is used to abut against the locking member 4.

[0043] Further explanation, such as Fig.10 and Fig.13 As shown, the toggle device 3 includes a support frame 201, and the support frame 201 is fixed to the swing seat 2; the toggle device 3 also includes a torsion spring 301 and a torsion spring control device 302, the torsion spring control device 302 includes an outer sleeve 3021 and a pull wire 3022 that can be telescopically moved in the outer sleeve 3021, the outer sleeve 3021 is installed on the support frame 201, and the part of the pull wire 3022 exposed from the outer sleeve 3021 is connected to a ball head 3023, and a compression spring 304 is also provided between the ball head 3023 and the support frame 201, and the compression spring 304 moves along the pull wire 3 022 is set in the extending direction, a torsion spring 301 is arranged beside the compression spring 304, the loop of the torsion spring 301 is sleeved on the column head 303, the column head 303 is fixed on the outer surface of the swing seat 2 in the same direction as the torsion spring control device 302, the torsion spring 301 has an elastic arm 1 3011 and an elastic arm 2 3012, the end of the elastic arm 1 3011 is circular and passes through the pull wire 3022 and abuts against the ball head 3023, and the elastic arm 2 3012 is bent and passed through the movable hole 203 reserved on the swing seat 2 and inserted into the dial hole 404 reserved on the locking member 4.

[0044] In further explanation, Fig.12 , Fig.13 and Fig.14As shown, when the pull wire 3022 moves in the shortening direction, the ball head 3023 drives the elastic arm 1 3011 to rotate, and at the same time, the compression spring 304 is compressed to generate a restoring elastic force, and the elastic arm 2 3012 drives the locking member 4 away from the boss 101, the swing gap is in a released state, the swing seat 2 can tilt and swing left and right, and the locking mechanism enters an unlocked state, and the swing seat 2 can be as shown in FIG. Figure 5 and Figure 6 As shown, it tilts and swings left and right; Fig. 9 , Fig.10 and Fig.11 As shown, when the pull wire 3022 is released, that is, moves in the lengthening direction, the compression spring 304 releases its elastic force to help the ball head 3023 and the torsion spring 301 to reset, and the torsion spring 301 drives the locking member 4 to fit up and down with the boss 101. At this time, the locking support plate 401 and the boss 101 form an upper and lower abutment, and there is no swinging gap between the swing seat 2 and the base 1. The swing seat 2 is locked and cannot swing. The locking mechanism enters a locked state, and the swing seat 2 cannot swing and remains as shown. Figure 4 The horizontal state shown.

[0045] To further explain, Fig.11 and Fig.14 As shown, in order for the locking member 4 to smoothly enter the position of the boss 101 and abut against it, the boss 101 has a slope and is low in height at one end that caters to the locking member 4, and the bottom surface of the locking support plate 401 also has a slope that matches the boss 101; in order not to affect the normal swinging function of the chassis, the width of the locking member 4 is smaller than the width of the swing seat 2 or the base 2 at the location; the width of the boss 101 is smaller than the width of the swing seat 2 or the base 2 at the location.

[0046] The above-mentioned locking mechanism describes an implementation method in which the locking member 4 is fitted to the inner surface of the swing seat 2 and the boss 101 is set on the base 2. In actual use, the locking member 4 can also be fitted to the upper surface of the base 1, and the boss can be set on the swing seat 2. The corresponding connection conditions of the toggle device 3 and the locking member 4 will change accordingly. Since the implementation principle is the same, this embodiment will not be described separately.

[0047] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A locking mechanism for tilting and swinging a chair seat to the left and right, comprising a base (1), and a swing seat (2) hinged to the base (1) at a middle position, wherein the swing seat (2) can tilt and swing to the left and right relative to the base (1) and a swing gap is formed between the swing seat (2) and the base (1), characterized in that: The invention also comprises a toggle device (3) and a locking member (4), wherein the locking member (4) is arranged between the swing seat (2) and the base (1), and the locking member (4) is movably mounted on any one of the swing seat (2) and the base (1). The toggle device (3) toggle the locking member (4) to move back and forth so that the locking mechanism switches between a locked state and an unlocked state. When the toggle device (3) toggle the locking member (4) to move in one direction, the locking member (4) at least fills a part of the swing gap and the swing seat (2) and the base (1) simultaneously form abutment with the locking member (4), the swing seat (2) is locked and cannot tilt and swing left and right, and the locking mechanism is in a locked state. When the toggle device (3) toggle the locking member (4) to move in the opposite direction, the swing gap is released and the locking member (4) no longer simultaneously forms abutment with the swing seat (2) and the base (1), the swing seat (2) can tilt and swing left and right, and the locking mechanism is in an unlocked state.

2. The locking mechanism for tilting and swinging the seat to the left and right according to claim 1, characterized in that: The locking member (4) and the swing seat (2) or the base (1) are relatively fixed in the longitudinal direction, and the locking member can move relative to the swing seat (2) or the base (1) along the front-rear direction of the base.

3. The locking mechanism for tilting and swinging the seat to the left and right according to claim 1, characterized in that: The locking member (4) is attached to the swing seat (2) and the locking member (4) slides forward and backward relative to the swing seat (2) under the action of the toggle device (3); a boss (101) for abutting against the locking member (4) is fixedly provided on the base; when the locking member (4) slides to the position of the boss (101), the locking member (4) and the boss (101) form an upper and lower abutment, and the locking mechanism enters a locked state; when the locking member (4) slides to leave the boss (101), the locking mechanism enters an unlocked state.

4. The locking mechanism for tilting and swinging the seat to the left and right according to claim 3, characterized in that: The base (1) comprises a bottom plate (102) and side plates (103) extending upward along the left and right sides of the bottom plate (102); a bridge plate (104) is provided at the front portion of the upper end of the side plate (103); and a portion of the bridge plate (104) between the two side plates (103) forms the boss (101).

5. The locking mechanism for tilting and swinging the seat to the left and right according to claim 3, characterized in that: Locking support plates (401) extend from both sides of the locking member (4). When the locking member (4) moves to a position where it fits with the boss (101), the bottom surface of the locking support plate (401) contacts the top surface of the boss (101), and there is no swinging gap between the swing seat (2) and the base (1). The swing seat (2) is locked and cannot swing.

6. The locking mechanism for tilting and swinging the seat to the left and right according to claim 2, characterized in that: The swing seat (2) has an inner surface facing downwards, the locking member (4) is fitted on the inner surface of the swing seat (2), the locking member (4) is provided with a fixing hole (402), the swing seat (2) is provided with a through limiting hole (202), a fixing screw (403) passes through the limiting hole (202) and is connected to the fixing hole (402), a nut of the fixing screw (403) is pressed against the outer surface of the swing seat (2) to suspend the locking member (4) below the inner surface of the swing seat (2), and the locking member (4) moves forward and backward along the limiting hole (202) relative to the swing seat (2) and the base (1).

7. The locking mechanism for tilting and swinging the seat to the left and right according to claim 3, characterized in that: The boss (101) has a slope, the height of the boss (101) is low at one end that meets the locking member (4), and the bottom surface of the locking support plate (401) also has a slope that matches the boss (101).

8. The locking mechanism for tilting and swinging the seat to the left and right according to claim 3, characterized in that: The width of the locking member (4) is smaller than the width of the swing seat (2) or the base (1) at the location; and the width of the boss (101) is smaller than the width of the swing seat (2) or the base (1) at the location.

9. The locking mechanism for tilting and swinging the seat to the left and right according to claim 1, characterized in that: The toggling device (3) comprises a support frame (201), and the support frame (201) is fixed on any one of the swing seat (2) and the base (1).

10. The locking mechanism for tilting and swinging the seat to the left and right according to claim 1, characterized in that: The toggle device (3) further comprises a torsion spring (301) and a torsion spring control device (302). The torsion spring control device (302) comprises an outer sleeve (3021) and a pull wire (3022) that can be telescopically moved within the outer sleeve (3021). The outer sleeve (3021) is mounted on the support frame (201). The portion of the pull wire (3022) that is exposed from the outer sleeve (3021) is connected to a ball head (3023). The ball head (302 A compression spring (304) is further provided between the support frame (201) and the support frame (302). The compression spring (304) is provided along the direction in which the pull wire (3022) extends. A torsion spring (301) is provided on the side of the compression spring (304). The collar of the torsion spring (301) is sleeved on the column head (303). The column head (303) is fixed on any surface of the swing seat (2) and the base (1) in the same direction as the torsion spring control device (302). The torsion spring (301) has an elastic arm ( The elastic arm (3011) and the elastic arm (3012) are connected to each other, the elastic arm (3011) is in contact with the ball head (3023), and the elastic arm (3012) is bent and passed through the movable hole (203) reserved on the swing seat (2) or the base (1) and then inserted into the shifting hole (404) reserved on the locking member (4); when the pull wire (3022) moves in the shortening direction, the elastic arm (3011) is driven to rotate by the ball head (3023) and the compression spring (3023) is pressed. 04) is compressed to generate a restoring elastic force, and the second elastic arm (3012) drives the locking member (4) away from the boss (101), so that the swing seat (2) can tilt and swing left and right; when the pull wire (3022) is released, that is, moves in the lengthening direction, the compression spring (304) releases the elastic force to help the ball head (3023) and the torsion spring (301) to reset, and the torsion spring (301) drives the locking member (4) to fit with the boss (101) up and down, and the swing seat (2) is locked and cannot swing.

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