Chairs, chair trays and wrench devices

Abstract

This utility model discloses a chair, a tray, and a wrench device thereof, including a housing and a handle. The handle is rotatably mounted on the housing and has a slot. The housing has a retractable locking element. Rotating the handle causes the locking element to engage or disengage from the slot, switching the handle between a free-rotating state and a locked state. The handle can be connected to a control device inside the chair tray via a cable, and rotating the handle switches the cable between a fixed state and a free state. The structure for controlling the tray's state is simpler, and the wrench device can switch between a locked state and a free-rotating state, thus enabling it to adapt to various types of trays and control mechanisms.

Description

Technical Field

[0001] This utility model relates to the field of home furnishings, and in particular to a chair, a tray and a wrench device thereof. Background Technology

[0002] Chairs typically have functions such as backrest tilt and seat height adjustment to meet user needs. However, to achieve these functions, users usually need to apply continuous force to a lever located on the side of the chair tray. Furthermore, when applying force, users may bend over or turn to the side, making the process of adjusting the chair quite cumbersome.

[0003] The prior art disclosed in CN207544712U is a wire-controlled synchronous tilt chassis with a sliding plate and a tilt locking control function. A locking hole is provided on the middle side plate of the base plate outside the movable seat, corresponding to the position of the locking pin. The outer end of the locking pin extends out of the movable seat and inserts into the locking hole of the base plate, locking the tilt function of the mechanism. Moving the locking wire control handle retracts the locking cable into the locking cable sheath, causing the small tension spring fixedly connected to the head of the locking cable to stretch in the same direction, generating tension. The other end of the small tension spring, through a retaining spring, drives the locking pin to overcome the elastic force of the small compression spring, causing the head of the locking pin to leave the locking hole of the base plate and retract into the movable seat, releasing the tilt mechanism. Conversely, when the external force of the locking wire control handle disappears, the tension of the small tension spring disappears, and the elastic force of the small compression spring pushes the locking pin outward from the movable seat and inserts into the locking hole of the base plate, entering the locking state. The skateboard has a locking function. Several locking slots are provided at the positions where the locking plates extend from the base plate. The locking plates extend beyond the base plate and insert into the corresponding locking slots of the skateboard, restricting the sliding between the skateboard and the base plate, thus locking the skateboard function. Moving the skateboard control handle retracts the skateboard cable at the other end of the cable sheath into the locking seat. This causes the locking plate, fixed by the connecting bolt, to overcome the spring force of the return spring, disengaging the locking plate from the locking slot of the skateboard and retracting it into the base plate. The restriction between the skateboard and the base plate is released, allowing the skateboard to slide longitudinally along the long slot. Conversely, when the external force on the skateboard control handle disappears, the spring force of the return spring pushes the skateboard cable out of the cable sheath. Simultaneously, the locking plate connected to the head of the skateboard cable extends beyond the base plate and inserts into the corresponding locking slot of the skateboard, entering the locking state.

[0004] In the existing technology, when adjusting the backrest tilt or the seat forward and backward adjustment, the locking mechanism or wrench mechanism used to control the cable requires continuous external force output; otherwise, the corresponding function of the chair will automatically lock, making the chair adjustment process more troublesome. Utility Model Content

[0005] In order to solve the problem that in the prior art, the user needs to continuously apply force to restrict the wrench device before the chair can be adjusted, the purpose of this utility model is to provide a chair, a tray and a wrench device thereof, the handle of which has a locked state and a free rotation state, thereby making the chair adjustment process more convenient.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a wrench device, comprising a housing and a handle, the handle being rotatably mounted on the housing, the handle having at least one slot, and the housing having a retractable locking member; rotating the handle can drive the locking member to engage or disengage from the slot, allowing the handle to switch between a free-rotating state and a locked state; the handle can be connected to a control device inside a chair tray via a cable, and rotating the handle can switch the cable between a fixed state and a free state.

[0007] Preferably, the outer casing is provided with a locking groove, and the locking component includes a drive spring and a locking steel ball. The drive spring and the locking steel ball are disposed in the locking groove, and the drive spring can push the locking steel ball into the slot of the handle.

[0008] Preferably, the slot is hemispherical.

[0009] Preferably, one end of the handle is inserted into the housing, and a grip is fixed to the other end of the handle.

[0010] Preferably, the outer casing includes a first housing and a second housing, which are fixedly connected. One end of the handle is inserted between the first housing and the second housing and rotates to engage. A locking groove is provided on the second housing.

[0011] Preferably, the first housing is provided with a second slot, the second housing is provided with a third slot, the handle is provided with a third through hole, the rotating shaft passes through the third through hole, and the two ends of the rotating shaft are respectively inserted into the second slot and the third slot.

[0012] Preferably, the first housing is provided with a third positioning groove and a fourth positioning groove, and multiple fourth positioning grooves are respectively provided on the upper and lower sides of the third positioning groove. The second housing has a fifth positioning protrusion and a sixth positioning protrusion. The fifth positioning protrusion matches the third positioning groove, and the sixth positioning protrusion matches the fourth positioning groove. The fifth positioning protrusion is inserted into the third positioning groove, and the sixth positioning protrusion is inserted into the fourth positioning groove. The first housing and the second housing are fixedly connected by fasteners. The fifth positioning protrusion is provided with a clearance hole, and the cable passes through the clearance hole and is connected to the handle.

[0013] A chair tray includes a base, a top seat, and a tail seat. The top seat is mounted on the base, and the tail seat is hinged to the base. When the tail seat rotates, it can drive the top seat to move. The base and the tail seat are provided with locking mechanisms for controlling the movement of the tail seat, including the aforementioned wrench device. The locking mechanism can be connected to the handle of the wrench device via a cable. By rotating the handle, the locking mechanism can be switched between a locked state and an unlocked state.

[0014] A chair includes the aforementioned chair tray.

[0015] The beneficial effects of the technical solution of this utility model are as follows: the structure used to control the state of the tray is simpler, and the wrench device can switch between the locked state and the free rotation state, thereby enabling the wrench device to adapt to various types of trays and various types of control mechanisms. Furthermore, the operation of the wrench device does not require the user to exert continuous force, making the adjustment process of the chair simpler and more free. Multiple slots enable the handle to have multiple locking positions, thereby allowing the control device connected to the handle to not only have a free state but also multiple control positions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the tray structure with the rear of the tailstock tilted downwards.

[0017] Figure 2 This is a schematic diagram of the tray structure with the tailstock in a horizontal position.

[0018] Figure 3 This is a schematic diagram of the tray structure with the rear of the tailstock tilted upwards.

[0019] Figure 4 A schematic diagram of the connection structure between the base plate and the top seat;

[0020] Figure 5 This is a schematic diagram of the top seat and the locking tongue;

[0021] Figure 6 A schematic diagram of the connection structure between the third spring and the second locking tongue;

[0022] Figure 7 This is a schematic diagram of the top seat structure;

[0023] Figure 8 This is a structural schematic diagram of the base plate;

[0024] Figure 9 Schematic diagram of the tray structure after removing the seat plate. Figure 1 ;

[0025] Figure 10 Schematic diagram of the tray structure after removing the seat plate. Figure 2 ;

[0026] Figure 11 Schematic diagram of the tray structure after removing the seat plate. Figure 3 ;

[0027] Figure 12 A schematic diagram of the tray structure after removing the seat plate, top seat, and elastic components;

[0028] Figure 13 This is a schematic diagram of the tailstock structure;

[0029] Figure 14 Schematic diagram of the locking mechanism Figure 1 ;

[0030] Figure 15 Schematic diagram of the locking mechanism Figure 2 ;

[0031] Figure 16 Schematic diagram of the lever structure Figure 1 ;

[0032] Figure 17 Schematic diagram of the lever structure Figure 2 ;

[0033] Figure 18 This is a schematic diagram of the connection structure of the gas spring, the rocker arm, and the base.

[0034] Figure 19 A schematic diagram of the connection structure between the second cable, the swing arm, and the second mounting base;

[0035] Figure 20 This is a schematic diagram of the pendulum rod.

[0036] Figure 21 Schematic diagram of the second mounting base Figure 1 ;

[0037] Figure 22 Schematic diagram of the second mounting base Figure 2 ;

[0038] Figure 23 A schematic diagram of the tray structure after removing the second outer trim panels of the seat plate, top plate, and tail plate;

[0039] Figure 24 Schematic diagram of the elastic component Figure 1 ;

[0040] Figure 25 Schematic diagram of the elastic component Figure 2 ;

[0041] Figure 26 Schematic diagram of the adjusting component Figure 1 ;

[0042] Figure 27 Schematic diagram of the adjusting component Figure 2 ;

[0043] Figure 28 This is a schematic diagram of the wrench device.

[0044] Figure 29 A schematic diagram of the wrench device after the second housing has been removed;

[0045] Figure 30 Schematic diagram of the handle structure Figure 1 ;

[0046] Figure 31 Schematic diagram of the handle structure Figure 2 ;

[0047] Figure 32 Schematic diagram of the second shell structure Figure 1 ;

[0048] Figure 33 Schematic diagram of the second shell structure Figure 2 ;

[0049] Figure 34 This is a schematic diagram of the first shell structure;

[0050] Figure 35 A schematic diagram of the handle's structure. Figure 1 ;

[0051] Figure 36 A schematic diagram of the handle's structure. Figure 2 ;

[0052] Figure 37 This is a structural schematic diagram of the first exterior trim panel.

[0053] Reference numerals: 1. Top seat; 111. Sixth limiting part; 112. Sixth positioning groove; 113. Mounting groove; 114. Second clearance groove; 115. Seventh positioning groove; 12. Seat plate; 121. Waist-shaped sliding hole; 122. Second through hole; 123. Insertion part; 124. Second latching protrusion; 125. First through hole; 13. Second locking tongue; 131. Locking end; 132. Slot; 133. Fourth clearance hole; 14. Third pull cable; 15. Cover; 16. Third spring; 17. Pressure cover;

[0054] 2. Base; 24. Limiting plate; 25. Positioning plate;

[0055] 3. Tailstock; 31. Side panel; 32. Rear panel; 33. Front panel; 34. Locking plate; 341. Locking hole; 35. Limiting seat; 351. First slide groove; 36. First outer trim panel;

[0056] 4. Second connecting rod; 41. Third axis; 42. Fourth axis; 43. Fifth axis;

[0057] 5. First connecting rod; 51. First shaft; 52. Second shaft;

[0058] 61. First spring; 62. First mounting base; 63. First gear; 64. Second gear; 65. Transmission block; 651. External gear; 66. Cam; 661. Gear slot; 662. Second limiting part; 67. Synchronous shaft; 68. Roller; 69. Drive rod; 60. Handle;

[0059] 71. Second mounting base; 711. Second positioning groove; 712. First positioning groove; 713. Positioning part; 714. Third limiting groove; 715. First limiting groove; 716. Fourth limiting part; 717. Fourth limiting groove; 718. Third positioning groove; 719. Fourth positioning groove; 710. Fifth positioning groove; 7101. Connecting hole; 72. Lever; 721. Second connecting part; 722. Fifth limiting part; 723. Drive groove; 724. Third limiting part; 725. Second limiting groove; 73. First locking tongue; 74. First cable; 76. Second spring; 77. Connecting cap; 78. First torsion spring;

[0060] 8. Gas spring; 81. Second cable; 82. Swing arm; 821. First operating end; 822. Receiving slot; 83. Connecting sleeve; 80. Switch;

[0061] 10. Handle; 101. Working end; 102. Second operating end; 103. Second positioning part; 104. Third positioning protrusion; 105. Third through hole; 106. Slot; 107. Third receiving groove; 108. Fourth slot; 109. Fourth receiving groove; 1000. Second positioning groove; 1001. First positioning groove; 1002. Threaded hole;

[0062] 20. First housing; 201. Third positioning groove; 202. Second receiving groove; 203. Fourth positioning groove; 204. Fourth positioning protrusion; 205. Second slot; 206. First positioning protrusion; 207. Connecting post;

[0063] 30. Second housing; 301. Assembly groove; 3011. Third slot; 302. Second extension; 3021. Locking groove; 303. Second positioning protrusion; 304. Fifth positioning protrusion; 305. Clearance hole; 306. Fifth positioning groove; 307. Sixth positioning protrusion;

[0064] 40. Handle; 401. Sixth positioning groove; 402. Seventh positioning groove; 403. Fourth through hole; 404. Exterior trim hole; 405. Assembly groove; 406. Second exterior trim panel; 407. Assembly column. Detailed Implementation

[0065] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0066] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship 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.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0068] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0069] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0070] Example 1

[0071] like Figure 28-37 The wrench device for controlling the movement of a chair tray shown includes a housing and a handle 10. The handle 10 is rotatably mounted on the housing. The handle 10 is provided with at least one slot 106. The housing is provided with a retractable locking member. Rotating the handle 10 can drive the locking member to engage or disengage from the slot 106, so that the handle 10 can switch between a free rotation state and a locked state.

[0072] The handle can be connected to the control device inside the chair tray via a cable, and the cable can be switched between a fixed state and a free state by turning the handle.

[0073] This design simplifies the structure for controlling the tray's state, and the wrench can switch between a locked state and a free-rotating state, thus enabling it to adapt to various types of trays and control mechanisms. Multiple slots allow the handle to have multiple locking positions, and the control device connected to the handle can have not only a free state but also multiple control positions.

[0074] In this embodiment, as Figures 29 to 32 As shown, the outer casing is provided with a locking groove 3021. The locking components include a drive spring and a locking steel ball, which are disposed within the locking groove 3021. The drive spring can push the locking steel ball into the slot 106 of the handle 10. This design ensures effective locking. By replacing different types of springs, the locking force of the wrench device can be easily adjusted, thus better matching each tray.

[0075] In this embodiment, as Figure 29 and Figure 30 As shown, the slot 106 is hemispherical. This design, through the cooperation of the steel ball and the spherical slot 106, allows for easier operation by the user, reduces friction between the handle 10 and the housing, and extends the lifespan of the device.

[0076] In this embodiment, as Figures 28 to 34 As shown, the outer casing includes a first housing 20 and a second housing 30, which are fixedly connected. One end of the handle 10 is inserted between the first housing 20 and the second housing 30 and rotates to engage. A locking groove 3021 is provided on the second housing 30.

[0077] To facilitate positioning and installation between the housing and the handle 10, in this embodiment, as follows: Figure 29 , Figure 32 , Figure 33 and Figure 34As shown, the first housing 20 is provided with a second slot 205, the second housing 30 is provided with a third slot 3011, and the handle 10 is provided with a third through hole 105. The rotating shaft passes through the third through hole 105, and its two ends are respectively inserted into the second slot 205 and the third slot 3011. More preferably, the first housing 20 is provided with an annular first positioning protrusion 206, and the second slot 205 is located inside the first positioning protrusion 206; the second housing 30 is provided with an annular second positioning protrusion 303, and the third slot 3011 is located inside the second positioning protrusion 303; the handle 10 is provided with a first positioning groove 1001 and a third positioning protrusion 104, and the two ends of the third through hole 105 communicate with the interior of the first positioning groove 1001 and the interior of the third positioning protrusion 104, respectively; the first positioning protrusion 206 is inserted into the first positioning groove 1001, and the second positioning protrusion 303 is inserted into the interior of the third positioning protrusion 104. More preferably, the first housing 20 is provided with an arc-shaped fourth positioning protrusion 204, and the handle 10 is provided with an arc-shaped second positioning groove 1000; the first positioning protrusion 206 is located in the second positioning groove 1000, and the first positioning protrusion 206 can slide in the second positioning groove 1000. More preferably, the first housing 20 is provided with a second receiving groove 202, and the first positioning protrusion 206, the fourth positioning protrusion 204, and the second slot 205 are disposed in the second receiving groove 202, with one end of the handle 10 disposed in the second receiving groove 202. This arrangement allows the handle 10 to be quickly and accurately installed in a designated position on the housing, ensuring the stability of the handle 10 during movement.

[0078] In this embodiment, as Figure 32 and Figure 33 As shown, the second housing 30 is provided with a first extension 301 and a second extension 302 protruding outward from the outer surface of the housing. A third slot 3011 extends into the first extension 301, and a locking groove 3021 extends into the second extension 302. This arrangement provides sufficient operating space for the pivot and locking mechanism, and also allows for a thinner first and second housing.

[0079] To facilitate positioning and assembly with the first housing 20 and the second housing 30, in this embodiment, as follows: Figure 32 and Figure 34As shown, the first housing 20 is provided with a third positioning groove 201 and a fourth positioning groove 203, and multiple fourth positioning grooves 203 are respectively provided on the upper and lower sides of the third positioning groove 201. The second housing 30 has a fifth positioning protrusion 304 and a sixth positioning protrusion 307. The fifth positioning protrusion 304 matches the third positioning groove 201, and the sixth positioning protrusion 307 matches the fourth positioning groove 203. The fifth positioning protrusion 304 is inserted into the third positioning groove 201, and the sixth positioning protrusion 307 is inserted into the fourth positioning groove 203. The first housing 20 and the second housing 30 are fixedly connected by fasteners. The fifth positioning protrusion 304 is provided with a clearance hole 305, and the cable passes through the clearance hole 305 and is connected to the handle 10. More preferably, the third positioning groove 201 is provided with a protruding connecting post 207, and the fifth positioning protrusion 304 is provided with a fifth positioning groove 306, and the connecting post 207 is inserted into the fifth positioning groove 306. More preferably, the upper and lower sides of the third positioning groove 201 are respectively provided with two fourth positioning grooves 203; the first housing 20 and the second housing 30 are fixedly connected by three screws, one screw is located between the two fourth positioning grooves 203 located on the upper side of the third positioning groove 201, another screw is located between the two fourth positioning grooves 203 located on the lower side of the third positioning groove 201, and the third screw is located between the second housing 30 and the connecting post 207. With this configuration, the first housing 20 and the second housing 30 can be quickly positioned and stably connected, and the housings can be quickly assembled and disassembled.

[0080] To facilitate the operation of the handle 10, in this embodiment, as follows: Figure 29 , Figure 35 , Figure 36 and Figure 37 As shown, the end of the handle 10 inserted into the outer casing is the working end 101, which is arc-shaped. The working end 101 is located in the second receiving groove 202 of the second housing 30. The third through hole 105, the first positioning groove 1001, the second positioning groove 1000, and the third positioning protrusion 104 are all located on the working end 101. The handle 10 is provided with a fourth slot 108, and the positioning post fixed to the end of the cable can be inserted into the fourth slot 108 to connect the cable and the handle 10. More preferably, the working end 101 is provided with a third receiving groove 107 and a fourth receiving groove 109. The third receiving groove 107 is located on the outer circumferential surface of the working end 101, and the third receiving groove 107 and the fourth slot 108 are connected through the fourth receiving groove 109. One end of the cable passes through the third receiving groove 107 and the fourth receiving groove 109 and is connected to the positioning post inserted into the fourth slot 108. This configuration ensures the stability of the wrench mechanism by positioning the handle 10 and the cable.

[0081] In this embodiment, as Figure 29 , Figure 35 , Figure 36 and Figure 37 As shown, the other end of the handle 10 is a second operating end 102, and a handle 40 is sleeved and fixed on the second operating end 102. More preferably, a second positioning part 103 protrudes from the second operating end 102, and a sixth positioning groove 401 is provided on the handle 40. A seventh positioning groove 402 is provided on the inner wall of the sixth positioning groove 401. The second operating end 102 is inserted into the sixth positioning groove 401, and the second positioning part 103 is inserted into the seventh positioning groove 402. After the second operating end 102 is inserted into the sixth positioning groove 401, the handle 40 and the handle 10 are fixedly connected by fasteners. More preferably, an outer decorative hole 404 is provided on the handle 40, and fasteners are disposed in the outer decorative hole 404. A second outer decorative plate 406 is engaged with the handle 40, and the second outer decorative plate 406 blocks the outer decorative hole 404. In a further preferred embodiment, an assembly groove 405 is provided on the inner wall of the outer trim hole 404, and an assembly post 407 protrudes from the second outer trim panel 406. The assembly post 407 is inserted into and tightly fitted with the assembly groove 405. A fourth through hole 403 communicating with the seventh positioning groove is provided on the inner wall of the assembly groove, and a threaded hole 1002 is provided on the second positioning part. The threaded part of the screw passes through the fourth through hole and is threadedly connected to the threaded hole. With this configuration, since the user directly grips the handle 40 to operate the wrench device, and the handle 40 and the handle 10 adopt the above structure, they can be quickly disassembled and assembled, and thus different shaped handles 40 can be quickly replaced, thereby adapting to more requirements.

[0082] like Figures 1 to 27 The chair tray using the aforementioned wrench device includes a base 2 for mounting support legs, a top seat 1 for mounting the seat, and a tail seat 3 for mounting the backrest. The base 2, top seat 1, and tail seat 3 are connected by a connecting rod. When the tail seat 3 moves, it can drive the top seat 1 to move synchronously via the connecting rod. A control device is included, comprising a locking mechanism and a control mechanism. A tail seat locking mechanism is provided between the base 2 and the tail seat 3. The locking mechanism has two states: locked and unlocked. When the locking mechanism is locked, the base 2 and the tail seat 3 are relatively fixed. When the locking mechanism is unlocked, the tail seat 3 can swing freely relative to the base 2. An elastic reset mechanism that can adjust the reset force is provided between the base 2 and the tail seat 3. When the locking mechanism is unlocked, the reset mechanism can drive the tail seat 3 to reset itself. A control mechanism for controlling the gas spring is also provided on the base 2. The seat can be mounted on the top seat 1 in a sliding manner via a seat plate 12.

[0083] With this design, the chair tray can be controlled for height adjustment, backrest tilt, seat forward and backward movement, and return force intensity, giving the chair tray more functions and making it suitable for more users.

[0084] In this embodiment, as Figures 10 to 12 As shown, the linkage includes a first linkage 5 and a second linkage 4. The first linkage 5 is located in front of the second linkage 4. The bottom of the first linkage 5 is hinged to the base 2 via a first shaft 51, and the top of the first linkage 5 is hinged to the top seat 1 via a second shaft 52. The bottom of the second linkage 4 is hinged to the base 2 via a third shaft 41, and the top of the second linkage 4 is hinged to the top seat 1 via a fifth shaft 43. The middle position of the second linkage 4 is slidably engaged with the rear end of the tail seat 3 via a fourth shaft 42, and the front end of the tail seat 3 is hinged to the base 2 via the first shaft 51. This configuration creates a multi-link structure consisting of the base, top seat, tail seat, first link, and second link, ensuring the overall connection strength of the tray. Secondly, the tail seat rotates around the fifth axis, which means that when the tail seat rotates, the elastic component preferentially provides feedback to the tail seat. Only when the pressure received by the fifth axis exceeds the thrust given to the top seat by the elastic component will the fifth axis drive the moving link to move the top seat. This results in a gentle force on the tail seat, providing stable support, and the process of the tail seat tipping over progresses from easy to difficult.

[0085] In a further preferred embodiment, the two first connecting rods 5 are arranged symmetrically on the left and right, and the two second connecting rods 4 are arranged symmetrically on the left and right, and the two second connecting rods 4 are fixedly connected by a reinforcing plate 44.

[0086] In a further preferred embodiment, a limiting seat 35 is fixed on the tailstock 3, and a first sliding groove 351 is provided on the limiting seat 35. One end of the fourth shaft 42 is fixedly connected to the second connecting rod 4, and the fourth shaft 42 passes through the first sliding groove 351 and slides in cooperation with the first sliding groove 351.

[0087] More preferably, the tailstock 3 includes two side plates 31, which are fixedly connected by an end plate; the limiting seat 35 is embedded in the side plates 31.

[0088] Further preferably, the side panel 31 is covered with a first outer trim panel 36. The first outer trim panel 36 includes a left stop and a right stop, the rear ends of the left stop and the right stop are fixed by a first connecting part, and the two side panels 31 are respectively embedded in the left stop and the right stop. This arrangement makes the tray more aesthetically pleasing.

[0089] In this embodiment, as Figures 23 to 25 As shown, the reset mechanism includes an elastic component for driving the tailstock 3 to reset and an adjusting component for adjusting the elastic force of the elastic component. The tailstock 3 is hinged to the base 2, and the two ends of the elastic component abut against the base 2 and the tailstock 3 respectively.

[0090] The adjustment assembly is located between the elastic component and the tailstock 3. The adjustment assembly includes a cam 66 and a first mounting seat 62. The first mounting seat 62 is fixed on the tailstock 3. The cam 66 is rotatably mounted on the first mounting seat 62. The cam 66 can abut against the elastic component. When the cam 66 rotates, it can push the elastic component, thereby changing the elastic force of the elastic component.

[0091] This design allows for free adjustment of the chair's return force, thus enabling the chair to adapt to users with different needs.

[0092] In this embodiment, as Figures 9 to 13 As shown, the end plate of the tailstock 3 includes a front plate 33 and a rear plate 32, which are respectively disposed at the front and rear ends of the side plate 31. Both the front plate 33 and the rear plate 32 are fixedly connected to the side plate 31. The first mounting base 62 is fixedly connected to the front plate 33 of the tailstock 3, and the two ends of the elastic component abut against the front plate 33 of the tailstock 3 and the rear end of the base 2, respectively. The left and right ends of the base are bent to form side stops, which are located between the two side plates. The first connecting rod 5, the second connecting rod 4, and the elastic component are all located between the two side stops. The two first connecting rods 5 are symmetrically arranged on the left and right, and the two second connecting rods 4 are symmetrically arranged on the left and right.

[0093] In this embodiment, the first mounting base 62 is hinged to the base 2, and the first mounting base 62 is fixedly connected to the front end plate 33 of the tailstock 3.

[0094] In this embodiment, as Figures 23 to 27 As shown, the adjustment assembly includes a first gear 63, a second gear 64, and a transmission block 65. The first gear 63 is fixed to the drive rod 69. The second gear 64 is rotatably mounted on the first mounting base 62 via a sixth shaft 641. The first gear 63 and the second gear 64 mesh and drive each other. The cam 66 is rotatably mounted on the first mounting base 62 via a seventh shaft. The transmission block 65 is mounted on a third shaft 41. The transmission block 65 and the cam 66 are fixedly connected by a locating pin. The transmission block 65 has protruding external teeth 651, which mesh with the second gear 64 for transmission. With this configuration, the first gear, the second gear, and the transmission block form a reduction structure, thereby enabling detailed adjustment of the cam rotation.

[0095] In a further preferred embodiment, the drive rod 69 is coaxially arranged with the first shaft 51, and the first mounting base 62 is hinged to the base via the drive rod.

[0096] In this embodiment, the elastic component includes an elastic element and a synchronizing element. The synchronizing element includes a synchronizing shaft 67, on which two rollers 68 are rotatably mounted. The front end of the elastic element abuts against the synchronizing shaft 67, and the rear end of the elastic element abuts against the rear end of the base 2.

[0097] Furthermore, the front end of the elastic member is provided with a first clearance groove and two first slots 106, the first clearance groove is located between the two first slots 106 and is interconnected, and the rear end of the elastic member is provided with an arc-shaped second slot 106; the rear end of the base 2 is fixed with a limiting plate 24, the limiting plate 24 is located behind the front end plate 33, and the top of the limiting plate 24 is provided with an arc-shaped first protrusion; the limiting plate 24 and the positioning plate 25 are integrally formed.

[0098] The rear end of the elastic element is fastened to the first protrusion of the positioning plate 25 through the second slot 106, thereby enabling the elastic element to rotate relative to the base 2; the first slot 106 at the front end of the elastic element fastens the synchronous shaft 67, and the roller 68 on the synchronous shaft 67 is inserted into the slot at the front end of the elastic element, with part of the roller 68 protruding from the slot, and the elastic element can push the roller 68 so that the roller 68 abuts against the front end plate 33 of the tailstock 3; the cam 66 abuts against the synchronous shaft 67.

[0099] In this embodiment, as Figures 23 to 27 As shown, there are two sets of elastic elements. Two rollers 68 are provided on the synchronous shaft 67. The two sets of elastic elements are symmetrically arranged, and the two rollers 68 cooperate with the two elastic elements respectively. The adjusting component has two cams 66. The transmission block 65 is located between the two cams 66. The transmission block 65 and the cams 66 are fixedly connected by a positioning pin. The two cams 66 abut against the part of the synchronous shaft 67 located between the two rollers 68.

[0100] More preferably, the synchronous shaft 67 has a first limiting part 671 protruding on it, and the first limiting part 671 is located between the two cams 66.

[0101] In this embodiment, as Figures 23 to 27 As shown, multiple gear slots 661 are provided on the outer peripheral surface of the cam 66. The synchronous shaft 67 is engaged with the gear slots 661 of the cam 66. By rotating the cam, the synchronous shaft 67 can be engaged with different gear slots, thereby realizing the elastic force adjustment of the elastic element.

[0102] In this embodiment, as Figures 23 to 27 As shown, a second limiting part 662 protrudes from the lower part of the front end of the tailstock 3. This configuration limits the rotation range of the cam 66.

[0103] In this embodiment, as Figures 23 to 27 As shown, the elastic element includes a first spring 61, a first connecting seat, and a second connecting seat; the front end of the first connecting seat has a guide portion protruding, and the rear end of the guide portion is provided with a guide hole; the front end of the second connecting seat has a guide rod protruding, and the guide rod is inserted into and slidably engaged with the guide hole; the first spring 61 is sleeved on the guide portion and the guide shaft, and the two ends of the first spring 61 abut against the first connecting seat and the second connecting seat respectively; a first slot 106 and a first clearance slot are provided at the front end of the first connecting seat, and a second slot 106 is provided at the rear end of the second connecting seat.

[0104] In this embodiment, a drive rod 69 is fixed on the handle 1060, and the drive rod 69 passes through the first shaft and is fixedly connected to the first gear.

[0105] In this embodiment, as Figures 16 to 22As shown, the tailstock 3 also includes a locking plate 34, which is fixed to the first connecting portion of the first outer trim panel 36. The locking plate 34 is located between the rear end plate 32 of the tailstock 3 and the base 2. The locking plate 34 is provided with a plurality of locking positions arranged vertically. The first locking tongue of the locking mechanism engages or disengages with the locking positions on the locking plate 34 to lock or unlock the tailstock 3 and the base 2. In this embodiment, the locking position is a lock hole 341; in other embodiments, the locking position can also be a position groove or a position protrusion.

[0106] Further preferably, the movement state of the locking mechanism also includes a locked state; the locking mechanism includes a first locking tongue 73 and a driving component, the first locking tongue 73 is slidably mounted on the base 2, and the driving component can drive the first locking tongue 73 to extend out of the base 2 or retract the first locking tongue 73 into the base 2; when the driving component drives the first locking tongue 73 to extend out of the base 2, the first locking tongue 73 can be inserted into the locking hole 341 on the locking plate 34 to fix the base 2 and the tail seat 3; when the driving component drives the first locking tongue 73 to retract into the base 2 and extend out, the first locking tongue 73 can be pulled out from the locking hole 341 on the tail seat 3, so that the tail seat 3 can swing freely relative to the base 2.

[0107] In this embodiment, as Figures 16 to 22 As shown, the locking mechanism also includes a first torsion spring 78, a second spring 76, and a first cable 74. The first torsion spring 78 is rotatably mounted on the base 2. The two legs of the first torsion spring 78 are the operating leg and the driving leg, respectively. The operating leg of the first torsion spring 78 is connected to the latch 73. The first cable 74 drives the latch 73 to move out or retract through the first torsion spring 78. When the latch 73 extends, it engages with the locking position on the tail seat 3, thereby locking the base 2 and the tail seat 3 relatively fixed. When the latch 73 retracts, it disengages from the locking position on the tail seat 3, allowing the tail seat 3 to rotate relative to the base 2. The second spring 76 is disposed between the cable and the driving leg of the first torsion spring 78. The second spring 76 can give the latch 73 a tendency to retract back to its original position. With this configuration, the locking mechanism provides a flexible and continuous driving force to the bolt through torsion springs and springs, thereby ensuring that the tailstock can rotate without the user having to consciously control it, and that the bolt can lock the tailstock and base in the appropriate position.

[0108] More preferably, when the above-mentioned wrench device is used to control the first cable 74, the first cable can be restricted to the normally closed position after the locking ball of the wrench device is inserted into the slot 106; the first cable is in the normally open position after the locking ball of the wrench device is disengaged from the slot 106; when the first cable 74 is in the normally open position, the second spring 76 drives the first torsion spring 78 to reset and disengage the locking tongue 73 from the tail seat 3, and the first cable 74 can drive the locking tongue 73 to be inserted into the locking hole 341 of the tail seat 3 through the first torsion spring 78; when the first cable 74 is in the normally closed position, the second spring 76 cannot drive the first torsion spring 78 to reset and disengage the locking tongue 73 from the tail seat 3.

[0109] In this embodiment, one end of the first cable 74 is the driving end, and the other end of the first cable 74 is the second operating end 102. The driving end of the first cable 74 is connected to the support leg of the first torsion spring 78, and the second operating end 102 of the first cable 74 is connected to the operating lever hinged on the base 2. The operating lever is provided with a gear position protrusion, and the base is provided with a gear position slot 106. After the user manually moves the operating lever to drive the gear position protrusion to engage with the gear position slot 106, the first cable 74 is restricted to the normally closed position, and the second spring 76 cannot drive the first torsion spring 78 to reset and disengage the locking tongue 73 from the tail seat 3. After the user manually moves the operating lever to drive the gear position protrusion to disengage from the gear position slot 106, the second spring 76 can drive the first torsion spring 78 to reset and disengage the locking tongue 73 from the tail seat 3.

[0110] In this embodiment, as Figures 16 to 22 As shown, the locking mechanism includes a lever 72, which is mounted on the base 2 in a slidable manner. The rear end of the lever 72 is fixedly connected to the first locking tongue 73, and the rear support leg of the second spring 76 is inserted into the lever 72.

[0111] In this embodiment, the positioning plate 25 on the base 2 has a second sliding groove, the first locking tongue 73 is disposed in the second sliding groove, the top of the fixed seat is fixed with a cover plate 26, the cover plate 26 has an oblong hole, the rear end of the lever 72 has a second connecting part 721 protruding, the second connecting part passes through the oblong hole on the cover plate 26 and is fixedly connected to the first locking tongue 73.

[0112] In this embodiment, a second mounting base 71 is fixed on the base 2. The second mounting base 71 is located in front of the first locking tongue 73. The lever 72 of the locking mechanism is slidably mounted on the second mounting base 71. The rear end of the lever 72 protrudes from the second mounting base 71 and is connected to the first locking tongue 7 and moves synchronously. A first torsion spring 78 is mounted on the second mounting base 71. The drive leg of the first torsion spring 78 is connected to one end of the first cable 74 and moves synchronously. The rear leg of the first torsion spring 78 is inserted into one end of the lever 72. A second spring 76 is sleeved on the first cable 74. The two ends of the second spring 76 abut against the second mounting base 71 and the front leg of the first torsion spring 78, respectively. A connecting cap 77 is fixed to the end of the first cable 74. The drive leg of the first torsion spring 78 is sleeved on the connecting cap 77. One end of the second spring 76 abuts against the drive leg of the first torsion spring 78 and the connecting cap 77 and moves synchronously.

[0113] In this embodiment, a first positioning groove 712 and a second positioning groove 711 are provided on the front end of the second mounting base 71. The first positioning groove 712 is located above the second positioning groove 711 and is connected to it by a snap-fit ​​part. One end of the wire is placed in the first positioning groove 712, and the end of the wire is snapped into the second positioning groove 711 by the snap-fit ​​part. The lower end of the second spring 76 is inserted into the first positioning groove 712 and abuts against the snap-fit ​​part of the first positioning groove 712. One end of the first cable 74 passes through the second positioning groove 711 and the second spring 76 and is connected to the drive leg of the first torsion spring 78.

[0114] More preferably, the second mounting base 71 is provided with a first positioning part 713, which is located above the first positioning groove 712, and a first torsion spring 78 is sleeved on the first positioning part 713; the lever 72 includes a base, one end of which is provided with a third limiting part 724, and the rear end of the second mounting base 71 is provided with a first limiting groove 715, the third limiting part 724 is inserted into the first limiting groove 715 and the two are slidably engaged; a fourth limiting part 716 protrudes from the inner wall of the first limiting groove 715, and a second limiting groove 725 is provided on the third limiting part 724, the fourth limiting part 716 is inserted into the second limiting groove 725 and is slidably engaged; the third limiting part 716 is slidably engaged with the second limiting groove 725; the third limiting part 716 is slidably engaged with the second limiting groove 725; the third limiting part 716 is slidably engaged with the second limiting groove 725; the third limiting part 716 is slidably engaged with the second limiting groove 712. A fifth limiting part 722 protrudes from part 724. A third limiting groove 714 is provided at the rear end of the second mounting base 71. The third limiting groove 714 is connected to the first limiting groove 715. The fifth limiting part 722 is located in the third limiting groove 714 and is slidably engaged. The fifth limiting part 722 and the fourth limiting part 716 are respectively provided on opposite sides of the third limiting part 724. A fourth limiting groove 717 is provided on the second mounting base 71. The fourth limiting groove 717 is located below the first limiting groove 715 and is connected to each other. The bottom of the fifth limiting part 722 protrudes from below the third limiting part 724. The bottom of the fifth limiting part 722 is inserted into the fourth limiting groove 717 and is slidably engaged.

[0115] In this embodiment, two third limiting parts 724 are arranged one after the other, and the two third limiting parts 724 cooperate to form a drive groove 723. The support leg of the first torsion spring 78 is inserted into the drive groove 723, and the first torsion spring 78 drives the lever 72 to move by pushing the end face of the third limiting part 724.

[0116] In this embodiment, as Figures 23 to 25 As shown, the second mounting base 71 is also equipped with a swing arm 82 for the control mechanism. A second cable 81 is fixedly connected to one end of the swing arm 82, and the second cable 81 can drive the swing arm 82 to swing. A reset component is provided between the swing arm 82 and the second mounting base 71 to drive the swing arm 82 to reset. With this configuration, the control mechanism and the locking mechanism are integrated on the second mounting base 71, which facilitates tray assembly and the positioning of various components.

[0117] In this embodiment, as Figure 14 As shown, the control mechanism's lever 82 and the locking mechanism's lever 72 are arranged in parallel.

[0118] In this embodiment, as Figure 22 As shown, the second mounting base 71 is provided with a fifth positioning groove 710, the rocker arm 82 is inserted into the fifth positioning groove 710, and the reset component is provided between the rocker arm 82 and the inner wall of the fifth positioning groove 710.

[0119] In a further preferred embodiment, the rocker arm 82 is hinged to the second mounting base 71 via a hinge shaft, and the reset element is a second torsion spring. The second torsion spring is sleeved on the hinge shaft, one leg of the second torsion spring abuts against the rocker arm 82, and the other leg of the second torsion spring is fixedly connected to the second mounting base 71.

[0120] More preferably, a connecting hole 7101 is provided inside the fifth positioning groove 710, and the end of the support leg of the second torsion spring is inserted into the connecting hole 7101.

[0121] In a further preferred embodiment, the rocker arm 82 has a first receiving groove 822, through which the hinge shaft passes. A second torsion spring is disposed within the first receiving groove 822, with one leg of the second torsion spring abutting against the inner wall of the first receiving groove 822, and the other leg of the second torsion spring extending out of the first receiving groove 822 and inserting into the connecting hole 7101. This arrangement allows for a more compact structure of the control mechanism, and the torsion spring of the second leg can limit the range of motion of the rocker arm 82.

[0122] In a further preferred embodiment, the second mounting base 71 is provided with a third positioning groove 718 and a fourth positioning groove 719. The third positioning groove 718 is located at the front end of the second mounting base 71, and the third positioning groove 718 and the fifth positioning groove 710 are connected through the fourth positioning groove 719. A second conduit is sleeved on the second cable 81, and the end of the second conduit is inserted into the third positioning groove 718. The second cable 81 passes through the fourth positioning groove 719 and is fixed to the front end of the swing rod 82.

[0123] In this embodiment, as Figures 17 to 20 As shown, a connecting sleeve 83 is installed on the base 2, and the gas rod 8 is installed on the base 2 through the connecting sleeve 83. The switch 80 of the gas rod 88 protrudes from the connecting sleeve 83. The rear end of the swing arm 82 is the first operating end 821, which is located above the switch 80 of the gas rod 8.

[0124] In this embodiment, the connecting sleeve 83 for installing the gas spring 88 and the positioning plate 24 for installing the first locking tongue 73 are both located in the middle of the base 2, with the connecting sleeve 83 located in front of the positioning plate 24.

[0125] In this embodiment, as Figures 4 to 6 As shown, a seat plate 12 for mounting a chair seat is slidably mounted on a top seat 1. The top of the top seat 1 is provided with a sixth positioning groove 112 and a seventh positioning groove 115. One end of the sixth positioning groove 112 communicates with the seventh positioning groove 115. A slidable second locking tongue 13 is installed within the sixth positioning groove 112. A second spring is provided between the second locking tongue 13 and the inner wall of the sixth positioning groove 112 to drive the end of the second locking tongue 13 into the seventh positioning groove 115. A plug-in portion 123 is provided on the seat plate 12. The plug-in portion 123 is located within the seventh positioning groove 115 and can slide within the seventh positioning groove 115. After the second locking tongue 13 extends into the seventh positioning groove 115, it can plug into the plug-in portion 123, fixing the top seat 1 and the seat plate 12. One end of a third pull cable 14 is fixedly connected to the second locking tongue 13. By pulling the second locking tongue 13 through the third pull cable 14, the second locking tongue 13 is disengaged from the seat plate 12, allowing the seat plate 12 and the top seat 1 to slide relative to each other.

[0126] In this embodiment, one end of the second latch 13 is a locking end 131, and a first slot 132 is provided on the locking end 131. Multiple second latching protrusions 124 protrude from the insertion part 123. The second latching protrusions 124 are plugged into and detached from the first slot 132, and three adjacent second latching protrusions 124 can lock the end of the second latch 13. More preferably, on the insertion part 123, two adjacent second latching protrusions 124 cooperate to form a slot 106, and the end of the second latch 13 can be inserted into the slot 106.

[0127] In a further preferred embodiment, a second through hole 122 is provided on the base plate, and the insertion part 123 is disposed in the second through hole 122.

[0128] In this embodiment, a third spring 16 is provided between the top seat 1 and the seat plate 12. A second clearance groove 114 is provided on the top of the top seat 1, and the third spring 16 is disposed in the second clearance groove 114. The two ends of the third spring 16 are respectively connected to the top seat 1 and the seat plate 12. The second clearance groove 114 passes through the sixth positioning groove 112, and a fourth clearance hole 305133 is provided on the second locking tongue 13. The third spring 16 passes through the fourth clearance hole 305133.

[0129] In a further preferred embodiment, the base plate 12 has a first through hole 125, one end of the third spring 16 is fixed to the top seat 1 by a fastener, and the other end of the third spring 16 hooks the base plate 12 through the first through hole 125.

[0130] In this embodiment, the top of the top seat 1 is provided with an installation groove 113, the sixth positioning groove 112 is provided in the installation groove 113, the pressure cover 17 is fixed in the installation groove 113, the pressure cover 17 seals the sixth positioning groove 112 and restricts the second locking tongue 13 in the sixth positioning groove 112.

[0131] In this embodiment, the seat plate 12 is provided with a plurality of waist-shaped sliding holes 121, and the top seat 1 has a protruding sixth limiting part 111. The sixth limiting part 111 extends into the waist-shaped sliding hole 121 and abuts against the side wall of the waist-shaped sliding hole 121. A cover 15 is fixed to the top of the sixth limiting part 111. The cover 15 presses the seat plate 12 onto the top seat 1 to prevent the seat plate 12 from moving up and down.

[0132] In this embodiment, the first cable 74 and the second cable 81 extend from the front end of the base 2, and the third cable 14 extends from the side of the base 2.

[0133] A chair includes the aforementioned tray, with a backrest mounted on the tail of the tray, a gas spring mounted on the base of the tray, and support legs mounted on the bottom of the gas spring.

[0134] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0135] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A wrench device, characterized in that: Includes a housing and a handle (10). The handle (10) is rotatably mounted on the housing. The handle (10) is provided with at least one slot (106). The housing is provided with a retractable locking member. Rotating the handle (10) can drive the locking member to engage or disengage from the slot (106), so that the handle (10) can switch between a free rotation state and a locked state. The handle (10) can be connected to the control device inside the chair tray via a cable, and the cable can be switched between a fixed state and a free state by turning the handle (10). The outer casing is provided with a locking groove (3021), and the locking component includes a drive spring and a locking steel ball. The drive spring and the locking steel ball are disposed in the locking groove (3021), and the drive spring can push the locking steel ball into the slot (106) of the handle (10). The outer casing includes a first housing (20) and a second housing (30), which are fixedly connected. One end of the handle (10) is inserted between the first housing (20) and the second housing (30) and rotates to engage. A locking groove (3021) is provided on the second housing (30). The first housing (20) is provided with a second slot (205), the second housing (30) is provided with a third slot (3011), the handle (10) is provided with a third through hole (105), the rotating shaft passes through the third through hole (105), and the two ends of the rotating shaft are respectively inserted into the second slot (205) and the third slot (3011); The first housing (20) is provided with a third positioning groove (201) and a fourth positioning groove (203). Multiple fourth positioning grooves (203) are respectively provided on the upper and lower sides of the third positioning groove (201). The second housing (30) has a fifth positioning protrusion (304) and a sixth positioning protrusion (307). The fifth positioning protrusion (304) matches the third positioning groove (201), and the sixth positioning protrusion (307) matches the fourth positioning groove (203). The fifth positioning protrusion (304) is inserted into the third positioning groove (201), and the sixth positioning protrusion (307) is inserted into the fourth positioning groove (203). The first housing (20) and the second housing (30) are fixedly connected by fasteners. The fifth positioning protrusion (304) is provided with a clearance hole (305). The cable passes through the clearance hole (305) and is connected to the handle (10). The second housing (30) is provided with a first extension (301) and a second extension (302) protruding outward from the outer shell. A third slot (3011) extends into the first extension (301), and a locking groove (3021) extends into the second extension (302). One end of the handle (10) inserted into the outer shell is the working end (101). The first housing (20) is provided with a second receiving groove (202), and the working end (101) is located in the second receiving groove (202) of the second housing (30). The working end (101) is arc-shaped and is used for... The working end (101) is provided with a third receiving groove (107) and a fourth receiving groove (109). The third receiving groove (107) is provided on the outer peripheral surface of the working end (101). The third receiving groove (107) and the fourth slot (108) are connected through the fourth receiving groove (109). One end of the cable passes through the third receiving groove (107) and the fourth receiving groove (109) and is connected to the positioning post inserted into the fourth slot (108). The fourth slot (108) and the card slot (106) are respectively provided on the opposite end faces of the working end (101).

2. The wrench device according to claim 1, characterized in that: The slot (106) is hemispherical.

3. The wrench device according to claim 1, characterized in that: One end of the handle (10) is inserted into the housing, and a handle (40) is fixed on the other end of the handle (10).

4. A chair tray, comprising a base (2), a top seat (1), and a tail seat (3), wherein the top seat (1) is mounted on the base (2), and the tail seat (3) is hinged to the base (2), and the tail seat (3) can drive the top seat (1) to move when it rotates; the base (2) and the tail seat (3) are provided with locking mechanisms for controlling the movement of the tail seat (3), characterized in that: The wrench device includes any one of claims 1-3 above, wherein the locking mechanism is connected to the handle (10) of the wrench device via a cable, and the locking mechanism can be switched between a locked state and an unlocked state by rotating the handle (10).

5. A chair, characterized in that: Includes the chair tray described in claim 4 above.

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