A turnover structure and folding chair

Abstract

The utility model discloses a kind of turnover structures, including pedestal and the moving part rotationally connected on it, sliding member is equipped between the two, sliding member is relative to pedestal, moving part sliding, and with one of components circumferential fixed, this component is relatively stationary part, another is relatively rotating part;State switching structure is equipped between sliding member and relatively rotating part, including gear block and at least two interval gear grooves, two are respectively arranged on sliding member and relatively rotating part;The sliding direction of sliding member is consistent with gear groove depth, gear block can be made into gear groove when sliding, gear block unlocks the rotation of moving part relative to pedestal when leaving;This structure is simple, only pedestal, moving part, sliding member and state switching structure can be realized turnover, sliding member has pivot and unlocking function, and work logic is different from existing structure, and state switching structure can guarantee the stability of moving part after turnover;The turnover structure is used in folding chair, to realize chair back quick turnover and stable use.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a flip structure and a folding chair. Background Technology

[0002] In today's seating industry, users demand convenient storage for seats, while manufacturers demand economical transportation. Traditional fixed seats cannot be folded, occupy a lot of space when not in use, and their large size leads to high shipping, warehousing, and packaging costs. This has driven the development of folding chairs, and foldable chairs are gradually appearing on the market to save storage space and reduce packaging and transportation costs.

[0003] The core of a folding chair lies in its flipping structure, which allows the backrest to flip relative to the seat, thus completing the folding process. However, existing folding chairs suffer from complex or unstable flipping structures.

[0004] For example, some folding chairs have added complex locking mechanisms or used complex mechanisms linked to the backrest to ensure the stability of the backrest (such as using the armrests as a mechanism linked to the backrest). Although this improves stability, it also increases the number of structural parts and assembly steps, raising production costs and assembly difficulty, which is not beneficial to the manufacturer.

[0005] For example, some folding chairs pursue a simple flipping structure and reduce locking parts, requiring users to flip the chair back and lock it with fasteners. Although the structure is simplified, the user's assembly experience is worse, which is not beneficial to the user.

[0006] Therefore, a simple and stable flipping structure is needed to enable the folding chair to flip quickly and be used stably. Summary of the Invention

[0007] To solve the aforementioned technical problems, this utility model provides a flipping structure, including a base and a moving component rotatably connected thereto. A sliding component is provided between the two, sliding relative to the base and the moving component, and circumferentially fixed to one of the components, which is a relatively stationary component and the other is a relatively rotating component. A state switching structure is provided between the sliding component and the relatively rotating component, including a gear block and at least two spaced gear slots, which are respectively provided on the sliding component and the relatively rotating component. The sliding direction of the sliding component is consistent with the depth of the gear slots. When sliding, the gear block can move in and out of the gear slots. When the gear block leaves, the rotation of the moving component relative to the base is unlocked. This structure is simple, requiring only a base, a moving component, a sliding component, and a state switching structure to achieve flipping. The sliding component also serves as a pivot and unlocking function. Its working logic differs from existing structures, and the state switching structure can ensure the stability of the moving component after flipping.

[0008] Furthermore, a folding chair is provided, including a support frame, a backrest, and the aforementioned flipping structure. The rotating seat on the support frame is the aforementioned base, and the rotating part on the backrest is the aforementioned moving part. The flipping structure enables the backrest to flip quickly and be used stably.

[0009] The technical solution of this utility model is implemented as follows: A flipping structure includes a base, a moving part rotatably connected to the base, and a sliding part between the base and the moving part, the sliding part being slidably disposed relative to the base and the moving part; The sliding component is circumferentially fixed to the base or moving component. Among the base and moving component, the component that is circumferentially fixed to the sliding component is a relatively stationary component, and the other component among the base and moving component is a relatively rotating component. A state switching structure is provided between the slider and the relative rotating member. The state switching structure includes a stop block and at least two spaced stop slots. The stop block is provided on one of the slider or the relative rotating member, and the stop slot is provided on the other slider or the relative rotating member. The sliding direction of the slider is the same as the groove depth direction of the stop slot. The slider is configured to cause the stop block to leave or enter the stop slot when it slides. When the stop block leaves the stop slot, the rotation of the moving member relative to the base is unlocked.

[0010] First, this solution has a simple structure. Apart from the necessary base and moving parts, only a sliding part and a state switching structure are needed to achieve the flipping motion. The state switching structure is used to ensure the stability of the moving parts after flipping. When the gear block enters different gear slots, the state of the flipping structure can be switched. The sliding part not only serves as the pivot between the moving parts and the base, but also, because the sliding part slides relative to the base and the moving parts, it can be used to unlock the rotation of the moving parts. This uses a different working logic than the flipping structure in existing seats.

[0011] Preferably, the slider includes a button located at its end, exposed above the relatively stationary component. The button is configured for a user to press to actively control the sliding of the slider. The button also allows the user to actively unlock the rotation of the moving component.

[0012] Preferably, the button is a disc-shaped end cap, and a return spring is provided between the button and the relatively stationary part. The return spring is arranged along the sliding direction of the slider and is configured to provide a spring force to the button, which tends to cause the gear block to move toward the gear slot. The return spring can return the gear block to the gear slot when the button is released.

[0013] Preferably, the slider passes through the base and the moving part, with its two axial ends exposed outside the relatively stationary and relatively rotating parts, respectively. The button is located at one end of the slider, and the stop block is located at the other end. The exposed button is for the convenience of the user to press it.

[0014] Preferably, both the base and the moving part are provided with shaft holes, and the slider is slidably disposed in the shaft holes; the slider has a ring seat at the other end with the button, and a stop block is disposed on the ring seat. Both the ring seat and the button are disc-shaped end caps, and the diameters of the ring seat and the button are larger than the shaft holes on the base and the moving part. The fact that the diameters of the ring seat and the button are larger than the shaft holes on the base and the moving part can prevent the slider from sliding out of the base and the moving part in the sliding direction.

[0015] Preferably, the slider includes a first connector and a second connector, which are inserted into each other along the sliding direction of the slider and fixed by screws. The button is disposed on the first connector, and the stop block is disposed on the second connector. Since the diameters of the ring seat and the button are larger than the shaft holes on the base and the moving part, the slider cannot be installed in a one-piece molding. Therefore, the slider is designed as a split type to achieve smooth assembly.

[0016] Preferably, the sliding member is circumferentially fixed to the base, and the base is a relatively stationary member; a limiting block is provided on the sliding member, and a limiting groove is opened in the shaft hole of the base, and the limiting block is slidably disposed in the limiting groove.

[0017] Preferably, a first receiving groove for accommodating the button is formed on the base, and a second receiving groove for accommodating the ring seat is formed on the moving part, with the stop groove located in the second receiving groove. When the slider slides, the button and the ring seat can selectively enter or leave their corresponding receiving grooves.

[0018] Preferably, there are two gear shift slots: a first gear shift slot and a second gear shift slot. The first gear shift slot has a passive unlocking structure, which is a sloped surface that gradually decreases in depth. The passive unlocking structure is configured such that when the gear shift block moves on the passive unlocking structure, it causes the sliding component to slide, allowing the gear shift block to leave the first gear shift slot. The passive unlocking structure enables the passive unlocking of the moving component. When the gear shift block is moving on the passive unlocking structure, the user only needs to rotate the moving component to unlock and switch gear positions.

[0019] A folding chair is characterized by comprising a support frame, a backrest, and a flipping structure disposed between the support frame and the backrest. The support frame has a rotating seat, which serves as the base. The backrest has a rotating part, which serves as the moving component. The backrest has a generally horizontal forward-folding posture and a generally vertical upright posture. In both the forward-folding and upright postures, a stop block is located in two different stop slots. When the backrest switches from the upright posture to the forward-folding posture, the sliding of the sliding component unlocks the forward rotation of the backrest. The rotating seat on the support frame serves as the base, and the rotating part on the backrest serves as the moving component. This flipping structure enables rapid flipping of the backrest and stable use.

[0020] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows: First, this solution has a simple structure. Apart from the necessary base and moving parts, only a sliding part and a state switching structure are needed to achieve the flipping motion. The state switching structure is used to ensure the stability of the moving parts after flipping. When the gear block enters different gear slots, the state of the flipping structure can be switched. The sliding part not only serves as the pivot between the moving parts and the base, but also, because the sliding part slides relative to the base and the moving parts, it can be used to unlock the rotation of the moving parts. This uses a different working logic than the flipping structure in existing seats. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the folding chair with the backrest in an upright position in an embodiment of the present invention. Figure 2 This is a schematic diagram of the three-dimensional structure of the folding chair in the embodiment of the present invention with the backrest in a forward-folding posture. Figure 1 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the folding chair in the embodiment of the present invention with the backrest in a forward-folding posture. Figure 2 ; Figure 4 This is a three-dimensional structural diagram of the folding chair with the backrest tilted backward in an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the movement of the folding chair in a folded state and a tilted state in an embodiment of the present invention; Figure 6 The explosion of the flipping structure in the embodiment of this utility model Figure 1 ; Figure 7 The explosion of the flipping structure in the embodiment of this utility model Figure 2 ; Figure 8 This is a cross-sectional view of the flipping structure in a folding chair according to an embodiment of the present invention; Figure 9 This is a schematic diagram showing that, in an embodiment of the present invention, the two working arms of the elastic element of the chair back are in the two receiving grooves when the chair back is in the forward-folding posture. When the chair back is in the forward-folding posture, the connection between the chair back and the support does not require pre-tightening of the elastic element. Figure 10 This is a schematic diagram showing the position of the second action arm in the second receiving groove when the chair back is in a forward-folding posture in an embodiment of the present invention. Figure 11 This is a schematic diagram of the second action arm contacting the wall of the second receiving groove when the chair back is flipped in an embodiment of the present invention. Figure 12 This is a schematic diagram showing the location of the second action arm and the second receiving groove of the chair back in a backward tilted posture in an embodiment of the present invention. Figure 13This is a schematic diagram showing the location of the second action arm and the second receiving groove of the chair back in an upright posture in an embodiment of the present invention. Figure 14 This is a three-dimensional structural diagram of the sliding member in an embodiment of the present invention; Figure 15 This is an exploded view of the sliding member in an embodiment of the present invention; Figure 16 This is a three-dimensional structural diagram of the two supports in the embodiment of this utility model; Figure 17 This is a schematic diagram of the first and second gear slots on the rotating part in an embodiment of the present invention; Figure 18 This is a three-dimensional structural diagram of the chair back in an embodiment of the present invention.

[0022] The reference numerals in the attached drawings are as follows: Rotating seat 1; Rotating part 2; Sliding part 3; First connecting part 31; Conical hole 311; Mounting groove 312; Second connecting part 32; Conical column 321; Mounting block 322; Rotation limiting block 33; Gear block 4; First gear groove 5; Forward tilt section 51; Rotating section 52; Inclined surface 53; Second gear groove 6; Button 7; First receiving groove 8; Return spring 9; Ring seat 10; Second receiving groove 11; Shaft hole 12; Rotation limiting groove 13; Screw 14; Bracket 21; Arm support part 211; Backrest 22; Seat 23; Tray 24; Support base 25; Lifting gas spring 251; Support foot 252; Mounting column 26; Elastic element 27; First actuating arm 271; Second actuating arm 272; First receiving groove 28; Second receiving groove 29; Roller 30. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] The specific implementation of this utility model is as follows: like Figure 6-8As shown, this utility model provides a flipping structure, including a base, a moving part rotatably connected to the base, and a sliding part 3 between the base and the moving part. The sliding part 3 is slidably disposed relative to both the base and the moving part. The sliding part 3 is circumferentially fixed to the base, and the moving part rotates relative to both the sliding part 3 and the base, making the base, which is circumferentially fixed to the sliding part 3, a relatively stationary part, and the moving part, which rotates relative to the sliding part 3, a relatively rotating part. A state switching structure is provided between the sliding part 3 and the moving part. The state switching structure includes a gear block 4 and a first gear groove 5 and a second gear groove 6 arranged at intervals. The gear block 4 is disposed on the sliding part 3, and the first and second gear grooves are disposed on the moving part, which is a relatively rotating part. The sliding direction of the sliding part 3 is the same as the groove depth direction of the gear groove. When the sliding part 3 slides, the sliding block leaves or enters the gear groove. When the gear block 4 leaves the gear groove, the relative movement between the moving part and the base is unlocked.

[0027] This flipping structure is used in a folding chair, such as Figure 1-5 As shown, the folding chair includes a support frame 21, a backrest 22, a seat 23, a tray 24, and a support base 25. The tray 24 is disposed on the lower surface of the seat 23, and the support base 25 is connected to the tray 24 and located below the tray 24. There are two supports 21, which are spaced apart from each other on the left and right sides. The lower end of each support 21 is connected to the lower surface of the seat 23 and extends upward to the side of the backrest 22. Unlike traditional seats, in this embodiment, the backrest 22 is only connected to the support frame 21, and the connection point of the backrest 22 is located above the seat 23, and it does not have a direct connection with the tray 24. The support frame 21 is the same as the backrest 22. The armrest 21 also serves as the armrest of the folding chair. The armrest 21 includes an arm support 211 at its upper end, which is arranged horizontally. The armrest 21 below the arm support 211 is an L-shaped vertical strip. A rotating seat 1 is set in the middle of the armrest 21. The backrest 22 has a forward-protruding rotating part 2 at its lower end. There are two rotating parts 2 corresponding to the armrest 21. The two rotating parts 2 are located at the left and right ends of the backrest 22, respectively. The rotating parts 2 are rotatably connected to the rotating seat 1 and rotate around the axis in the left and right direction. The sliding member 3 is slidably disposed on the rotating parts 2 and the rotating seat 1 and can be used to unlock the rotation of the backrest 22.

[0028] Specifically, the flip structure has two unlocking methods: active unlocking and passive unlocking. Active unlocking is achieved by the user controlling the sliding member 3 to slide, while passive unlocking is achieved by the user rotating the backrest 22 to drive the sliding member 3 to slide. Passive unlocking can only be achieved when the backrest 22 rotates in one direction. If the backrest 22 rotates in the other direction, the backrest 22 is still locked by the stop block 4 and the stop groove.

[0029] The active unlocking implementation structure is as follows: like Figure 6-8As shown in Figures 14 and 15, the slider 3 includes a button 7 located at the end of the slider 3. The button 7 is exposed on the rotating seat 1, which is a relatively stationary component. The button 7 is configured for the user to press to actively control the slider 3 to slide. The button 7 is a disc-shaped end cap. The rotating seat 1 is provided with a first receiving groove 8 corresponding to the button 7, which can accommodate the button 7. When the slider 3 slides, the button 7 will enter or leave the first receiving groove 8. A return spring 9 is provided between the button 7 and the rotating seat 1. The return spring 9 is located in the first receiving groove 8, and its two ends abut against the end faces of the button 7 and the first receiving groove 8, respectively. The return spring 9 is configured to provide a spring force to the button 7, and this spring force causes the gear block 4 to tend to move toward the gear groove. That is, when the user presses the button 7, the slider 3 slides and causes the gear block 4 to leave the gear groove. When the user releases the button 7, under the action of the return spring 9, the slider 3 slides in the direction that the gear block 4 moves toward the gear groove.

[0030] The passive unlocking implementation structure is as follows: like Figure 6-8 As shown in Figures 14-18, a ring seat 10 is provided on the slider 3 located at the other end of the button 7. The gear block 4 is disposed on the ring seat 10, which is also a disc-shaped end cap. The rotating part 2 is provided with a second receiving groove 11 that can accommodate the ring seat 10. The first gear groove 5 and the second gear groove 6 are both opened in the second receiving groove 11. The first gear groove 5 and the second gear groove 6 are arranged at intervals along the rotation direction of the chair back 22, that is, at intervals along the circumferential direction. Both the first gear groove 5 and the second gear groove 6 have It has an arc shape; the first gear slot 5 has a forward-flipping section 51 and a rotating section 52, the rotating section 52 is closer to the second gear slot 6 than the forward-flipping section 51; the bottom surface of the forward-flipping section 51 is flat, the rotating section 52 has the above-mentioned passive unlocking structure, and in the direction from the forward-flipping section 51 to the second gear slot 6, the rotating section 52 has an inclined surface 53 whose groove depth gradually becomes shallower; the passive unlocking structure is configured such that when the gear block 4 moves on the passive unlocking structure, it drives the sliding member 3 to slide, and can make the gear block 4 leave the first gear slot 5.

[0031] The active and passive unlocking mechanisms work together to provide different states for the movement of the chair back 22. When the stop block 4 moves from the first stop slot 5 to the second stop slot 6, passive unlocking is sufficient without pressing the button 7. When the stop block 4 moves from the second stop slot 6 to the first stop slot 5, active unlocking is required. This allows the folding chair to have a folding state and a tilting state. Specifically: The backrest 22 is rotatably mounted on the support 21 around a left-right axis, allowing the upper end of the backrest 22 to rotate in the front-back direction. In the folded state, the backrest 22 can switch between an upright posture and a forward-folding posture; in the reclining state, the backrest 22 can switch between an upright posture and a backward-tilting posture. The backrest 22 remains approximately vertical in the upright posture. When switching from the upright posture to the forward-folding posture, the upper end of the backrest 22 rotates forward until the backrest 22 is approximately horizontal; when switching from the upright posture to the backward-tilting posture, the upper end of the backrest 22 rotates backward. That is, in the folded state, the folding function of the folding chair is realized, with the backrest 22 located above the seat 23, and the backrest 22 approximately horizontal in the forward-folding posture. The chair reclines on top of the seat 23, thus folding the backrest 22 and the seat 23. In the tilted state, the backrest 22 tilts backward as the user leans back, achieving the tilting function of the backrest 22. The tilting and folding functions are achieved through the same structure. Moreover, the backrest 22 rotates around the same axis in both the folded and tilted states. When the folding chair is in the folded state and the backrest 22 is rotating, the stop block 4 moves in the first stop groove 5. When the folding chair is in the tilted state and the backrest 22 is rotating, the stop block 4 moves in the second stop groove 6. When the folding chair switches from the folded state to the tilted state, the stop block 4 moves from the first stop groove 5 into the second stop groove 6, and vice versa.

[0032] When the shift block 4 is located in the forward-folding section 51 of the first shift slot 5, the backrest 22 is in a forward-folding posture. When the backrest 22 rotates from the forward-folding posture to the upright posture in the flipped state, the shift block 4 slides from the inclined surface 53 until it enters the second shift slot 6. The lengths of both the first shift slot 5 and the second shift slot 6 are greater than the length of the shift block 4, so that when the shift block 4 is in the first shift slot 5, the backrest 22 can be flipped to the upright posture directly without unlocking. When the shift block 4 is in the second shift slot 6, the backrest 22 can also rotate back and forth to tilt the backrest 22.

[0033] The bottom surface of the second gear slot 6 is a plane. The first and last positions of the path of the second gear slot 6 can restrict the gear block 4 from leaving the second gear slot 6. Therefore, it is necessary to press the button 7 to make the slider 3 slide left and right to drive the gear block 4 away from the second gear slot 6. Then, by rotating the chair back 22 forward, the gear block 4 is aligned with the first gear slot 5. Finally, the gear block 4 is released to slide into the first gear slot 5.

[0034] In addition, the support base 25 includes a lifting gas spring 251 and a support foot 252. When the chair back 22 is in the forward-folding position, since the rotating seat 1 is located in the middle of the bracket 21 and is higher than the seat 23, there is a gap between the chair back 22 and the seat 23. At this time, the support base 25 can be removed, and the lifting gas spring 251 and the support foot 252 can be separated. This gap allows the support foot 252 to be placed in it. Since the support foot 252 is generally a five-star foot, the support foot 252 can be placed on the seat 23. The rollers 30 under the support foot 252 are located around the seat 23. This is the packaging and transportation state of the folding chair. When the consumer receives the folding chair in this state, he / she only needs to connect the tray 24 and the support foot 252 with the lifting gas spring 251, and then flip the chair back 22 backward and upward to an upright position before using it.

[0035] Furthermore, such as Figure 9-13 As shown, the side connecting the rotating seat 1 and the rotating part 2 is called the inner side of the rotating seat 1 and the rotating part 2, while the side farther away from the rotating seat 1 and the rotating part 2 is called the outer side of the rotating seat 1 and the rotating part 2. The sliding member 3 passes through the rotating seat 1 and the rotating part 2, and the two ends of the sliding member 3 in the axial direction are exposed on the outer sides of the rotating seat 1 and the rotating part 2, respectively. That is, the button 7 and the ring seat 10 are located on the outer sides of the rotating seat 1 and the rotating part 2, respectively. The first receiving groove 8 is provided on the outer side of the rotating seat 1, and the second receiving groove 11 is provided on the outer side of the rotating part 2. A mounting post 26 protrudes from the inner side of the rotating part 2, and an elastic member 2 is provided on the mounting post 26. 7. The elastic element 27 is a torsion spring or a coil spring. In this embodiment, the elastic element 27 is a torsion spring. One end of the elastic element 27 is stationary relative to the rotating seat 1 of the bracket 21, and the other end of the elastic element 27 is connected to the rotating part 2 of the backrest 22. The elastic element 27 is configured to provide a spring force for the backrest 22 to flip forward. When the backrest 22 switches from an upright state to a forward-flipping state, the elastic element 27 provides an auxiliary flipping spring force for the backrest 22. When the backrest 22 switches from an upright state to a reclining state, the elastic element 27 provides a tilting spring force for the backrest 22. When the backrest 22 switches from a reclining state back to an upright state, the elastic element 27 provides a restoring spring force for the backrest 22.

[0036] The elastic element 27 is fixed to the bracket 21 either directly or indirectly by being fixed to other locations so that it remains relatively stationary relative to the bracket 21. Specifically, the elastic element 27 has a first actuating arm 271 and a second actuating arm 272. The inner side of the rotating seat 1 is provided with a first receiving groove 28, and the inner side of the rotating part 2 is provided with a second receiving groove 29. The first actuating arm 271 is disposed in the first receiving groove 28, and the second actuating arm 272 is disposed in the second receiving groove 29. The size of the first receiving groove 28 corresponds to the diameter of the first actuating arm 271, so that the first actuating arm 271 remains relatively stationary when the chair back 22 rotates. The elastic element 27 has an initial state with no elastic force output and an active state with elastic force. When the chair back 22 is in a forward-folding posture, the elastic element 27 is in the initial state. When the chair back 22 switches from the forward-folding posture to the upright posture, the second receiving groove 29 rotates relative to the first receiving groove 28, and the second actuating arm 272 rotates relative to the first actuating arm 271, causing the elastic element 27 to deform and enter the active state.

[0037] The second receiving groove 29 is larger than the diameter of the second actuating arm 272, and the second receiving groove 29 is fan-shaped. When the chair back 22 is in a forward-folding position, the first actuating arm 271 and the second actuating arm 272 directly enter the first receiving groove 28 and the second receiving groove 29, with the second actuating arm 272 located at the rear of the second receiving groove 29. This eliminates the need for pre-tightening the elastic element 27 during installation, greatly reducing assembly difficulty. When the chair back 22 rotates backward from the forward-folding position, the second actuating arm 272 moves to the front of the second receiving groove 29 until it intersects with the second receiving groove 29. The front end of the second receiving groove 29 abuts against the backrest 22, which continues to rotate, causing the second action arm 272 to rotate relative to the first action arm 271, thereby pre-tightening the elastic element 27. In other words, after the consumer completes the installation of the support base 25, the elastic element 27 is pre-tightened while flipping the backrest 22, thus ensuring that the elastic element 27 can always provide tilting elasticity when the folding chair is tilted. The gap at the front of the second receiving groove 29 can prevent the elastic element 27 from giving too much elasticity when flipping the backrest 22, which would increase the difficulty of flipping the backrest 22.

[0038] Furthermore, both the rotating base 1 and the rotating part 2 are provided with shaft holes 12, and the sliding member 3 is slidably disposed in the shaft hole 12. The diameters of the ring seat 10 and the button 7 are both larger than the shaft holes 12 on the rotating base 1 and the rotating part 2. Since the diameters of the ring seat 10 and the button 7 are both larger than the shaft holes 12, the sliding member 3 is made by splicing rather than being integrally formed. The sliding member 3 includes a first connecting member 31 and a second connecting member 32. The first connecting member 31 and the second connecting member 32 are inserted into each other along the sliding direction of the sliding member 3 and fixed by screws 14. The button 7 is disposed on the first connecting member 31, and the stop block 4 is disposed on the second connecting member 31. 2. The sliding member 3 is circumferentially fixed to the rotating seat 1 by means of a radially protruding limiting block 33 on the sliding member 3, and a limiting groove 13 is opened in the shaft hole 12 of the rotating seat 1, and the limiting block 33 is slidably disposed in the limiting groove 13; the end of the second connecting member 32 near the first connecting member 31 has a tapered column 321, and two mounting blocks 322 are protruding on both sides of the tapered column 321. The first connecting member 31 is provided with a tapered hole 311 corresponding to the tapered column 321, and two mounting grooves 312 are opened corresponding to the two mounting blocks 322, so as to facilitate the connection between the first connecting member 31 and the second connecting member 32.

[0039] Two sets of gear blocks 4 and gear slots are provided between the sliding member 3 and the rotating part 2 to increase the stability of the gear blocks 4 and gear slots.

[0040] The rotating part 2 can also be located in the middle or lower part of the backrest 22. In this embodiment, the rotating part 2 is located at the lower end of the backrest 22 to ensure that the backrest 22 will not interfere with the seat 23 when it rotates.

Claims

1. A flip structure, characterized by: Includes a base, on which a moving part is rotatably connected, and a sliding part is provided between the base and the moving part, the sliding part being slidably disposed relative to the base and the moving part; The sliding component is circumferentially fixed to the base or moving component. Among the base and moving component, the component that is circumferentially fixed to the sliding component is a relatively stationary component, and the other component among the base and moving component is a relatively rotating component. A state switching structure is provided between the slider and the relative rotating member. The state switching structure includes a stop block and at least two spaced stop slots. The stop block is provided on one of the slider or the relative rotating member, and the stop slot is provided on the other slider or the relative rotating member. The sliding direction of the slider is the same as the groove depth direction of the stop slot. The slider is configured to cause the stop block to leave or enter the stop slot when it slides. When the stop block leaves the stop slot, the rotation of the moving member relative to the base is unlocked.

2. The flipping structure according to claim 1, characterized in that: The slider includes a button located at the end of the slider and exposed to a relatively stationary component. The button is configured to be pressed by a user to actively control the sliding of the slider.

3. The flipping structure according to claim 2, characterized in that: The button is a disc-shaped end cap. A return spring is provided between the button and the relatively stationary part. The return spring is arranged along the sliding direction of the sliding part. The return spring is configured to give the button a spring force, and the spring force causes the gear block to tend to move toward the gear slot.

4. The flipping structure according to claim 2, characterized in that: The slider passes through the base and the moving part. The two ends of the slider in the axial direction are exposed outside the relatively stationary part and the relatively rotating part, respectively. The button is located at one end of the slider, and the stop block is located at the other end of the slider.

5. The flipping structure according to claim 4, characterized in that: Both the base and the moving part are provided with shaft holes, and the sliding part is slidably disposed in the shaft holes; the sliding part is provided with a ring seat at the other end with the button, and the stop block is disposed on the ring seat. Both the ring seat and the button are disc-shaped end caps, and the diameters of the ring seat and the button are larger than the shaft holes on the base and the moving part.

6. The flipping structure according to claim 5, characterized in that: The sliding component includes a first connector and a second connector. The first connector and the second connector are inserted into each other along the sliding direction of the sliding component and fixed by screws. A button is set on the first connector and a gear block is set on the second connector.

7. The flipping structure according to claim 5, characterized in that: The sliding component is circumferentially fixed to the base, which is a relatively stationary component. A rotation limiting block is provided on the sliding component, and a rotation limiting groove is opened in the shaft hole of the base. The rotation limiting block is slidably disposed in the rotation limiting groove.

8. The flipping structure according to claim 7, characterized in that: A first receiving groove for accommodating a button is provided on the base, and a second receiving groove for accommodating a ring seat is provided on the moving part, with the gear slot provided in the second receiving groove.

9. The flipping structure according to claim 1, characterized in that: There are two gear slots, namely the first gear slot and the second gear slot. The first gear slot has a passive unlocking structure, which is a slope with a shallower groove depth. The passive unlocking structure is configured such that when the gear block moves on the passive unlocking structure, it drives the slider to slide and can make the gear block leave the first gear slot.

10. A folding chair, characterized in that: The device includes a support frame, a backrest, and a flipping structure as described in any one of claims 1-9, disposed between the support frame and the backrest. The support frame has a rotating seat, which is the base. The backrest has a rotating part, which is the moving part. The backrest has a generally horizontal forward-folding posture and a generally vertical upright posture. In the forward-folding posture and the upright posture, the shift block is located in two different shift slots. When the backrest switches from the upright posture to the forward-folding posture, the forward rotation of the backrest is unlocked by the sliding of the sliding member.

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