A folding chair frame and folding chair

Abstract

This application discloses a folding chair frame, relating to the field of folding chair technology. The folding chair frame includes a seat, a backrest, and a first leg adjacent to the backrest. The frame also includes a first locking member and a first rotation-limiting mechanism. The backrest has a first protrusion. The first protrusion rotatably passes through the seat and the first leg and connects to the first locking member. The first rotation-limiting mechanism is fixed to the first leg and can change its position relative to the seat and backrest according to the change in the tightness between the first locking member and the first protrusion, thereby allowing the first leg and backrest to rotate to multiple angles relative to the seat simultaneously and be locked in place. This application uses a control rotation mechanism combining the first locking member and the first rotation-limiting mechanism to achieve simultaneous locking and rotation of the first leg and backrest relative to the seat to multiple angles. The folding chair frame is small in size and simple in structure.

Description

Technical Field

[0001] This application relates to the field of folding chair technology, and more specifically, to a folding chair frame and a folding chair incorporating the folding chair frame. Background Technology

[0002] The main feature of folding chairs is their ability to fold, significantly reducing their size and making them easy to carry. They have become essential equipment for home, work, and travel. However, some folding chairs have a fully integrated, real-time folding mechanism. Adjusting the backrest angle automatically adjusts the leg angle, or vice versa, preventing independent adjustment of either the backrest or legs, which is inconvenient. Other folding chairs feature coaxial rotation of the backrest and legs, but use separate mechanisms to control their rotation, resulting in multiple, bulky, and complex mechanisms. Summary of the Invention

[0003] To address the issue that existing folding chairs cannot independently adjust the backrest angle or leg angle, or require separate mechanisms to control the rotation of the backrest and legs, resulting in large and complex devices, this application proposes a folding chair frame and a folding chair that use the same rotation control mechanism to adjust the backrest angle or leg angle separately.

[0004] In the first aspect, this application proposes a folding chair frame and adopts the following technical solution.

[0005] A folding chair frame includes a seat, a backrest, and a first leg adjacent to the backrest. The folding chair frame also includes a first locking member and a first rotation-limiting mechanism. The backrest has a first protrusion. The first protrusion rotatably passes through the seat and the first leg and is connected to the first locking member. The first rotation-limiting mechanism is fixed to the first leg and can change its position relative to the seat and the backrest according to changes in the tightness between the first locking member and the first protrusion, thereby simultaneously allowing the first leg and the backrest to rotate to multiple angles relative to the seat and simultaneously lock in place.

[0006] By adopting the above technical solution, a set of control rotation mechanism combining the first locking member and the first rotation limiting mechanism is used to realize that the first chair leg and the chair back can be rotated to multiple angles relative to the chair seat and locked at the same time. Compared with some related folding chair solutions, this solution can adjust the chair back angle or the chair leg angle separately, and also reduces the number of control rotation mechanisms, making the folding chair frame small in size and simple in structure.

[0007] In a preferred embodiment of this folding chair frame, the first rotation limiting mechanism includes a first long rod and a first short rod, both fixed to the first chair leg. The chair seat has a first arc-shaped hole and multiple first limiting holes; the chair back has multiple bottom holes. When the first locking member and the first protrusion are in a tightened state, the first long rod passes through the first arc-shaped hole and is inserted into one of the bottom holes, while the first short rod is inserted into one of the first limiting holes. When the first locking member and the first protrusion are in a relaxed state, the first long rod disengages from the bottom hole and the first short rod disengages from the first limiting hole.

[0008] By adopting the above technical solution: when the first locking member and the first protrusion are in a tightened state, the first short rod is inserted into the seat. Since the first short rod and the first protrusion are connected in series with the first chair leg and the seat respectively to form a double-axis brake, the rotation of the first chair leg relative to the seat is prevented, that is, the rotation of the first long rod is prevented. Also, since the first long rod and the first protrusion are connected in series with the seat and the backrest respectively to form a double-axis connection brake, the rotation of the backrest relative to the seat is prevented. When the first locking member and the first protrusion are in a loose state, the first short rod is not connected to the seat. The first long rod fixed on the first chair leg is inserted into the first arc-shaped hole of the seat. The first protrusion is connected in series with the first chair leg and the seat, so that the first long rod can move along the first arc-shaped hole, that is, the first chair leg can rotate relative to the seat along the first arc-shaped hole. At the same time, the first long rod is not connected to the backrest. Only the first protrusion is connected in single-axis series with the seat and the backrest, so that the backrest can rotate relative to the seat. The above-mentioned design, including long and short rods, arc-shaped holes, and a first protrusion, enables a control rotation mechanism that combines a set of locking components and a first rotation limiting mechanism. This allows the first chair leg and the chair back to rotate to multiple angles relative to the chair seat and lock and fix them simultaneously.

[0009] In a preferred embodiment of this folding chair frame, the first arc-shaped hole is a 90-130° arc. When the first long rod is located at the first end of the first arc-shaped hole, the first short rod is adapted to be inserted into one of the first limiting holes, and the angle between the first chair leg and the seat is 90-130°. When the first long rod is located at the second end of the first arc-shaped hole, the first short rod is adapted to be inserted into the other of the first limiting holes, and the angle between the first chair leg and the seat is 0-10°.

[0010] By adopting the above technical solutions: the first chair leg can rotate to an angle perpendicular to or slightly outward from the seat, providing stable support; the first chair leg can rotate to a state flush with the seat, enabling folding and storage, and the adjustment process is simple.

[0011] As a preferred embodiment of the folding chair frame, the chair back is provided with at least three bottom holes. When the first long rod is located at the first end of the first arc-shaped hole, aligning the first long rod with the first bottom hole results in an angle of 90-105° between the chair back and the seat, and aligning the first end with the second bottom hole results in an angle of 120-135° between the chair back and the seat.

[0012] By adopting the above technical solution, the chair back can be adjusted to be perpendicular to the chair seat or slightly tilted backward, or even further tilted backward. The adjustment steps are simple and convenient to use.

[0013] As a preferred embodiment of the folding chair frame, when the first long rod is located at the second end of the first arc-shaped hole, the chair back is connected to the first long rod with the third bottom hole, such that the angle between the chair back and the chair seat is 0-10°, and the first chair leg is located on the outside of the chair seat, and the chair back is located on the inside of the chair seat.

[0014] By adopting the above technical solution, the chair back can be adjusted to be flush with the chair seat, the chair back is tucked inside the chair seat, and the chair legs are tucked outside the chair seat without crossing, making adjustment convenient.

[0015] As a further improvement to the folding chair frame, the folding chair frame also includes a first spring, which is supported between the first chair leg and the seat. The first spring can extend as the tightness between the first locking member and the first protrusion decreases, so that the first chair leg moves away from the seat, thereby causing the first long rod to disengage from the bottom hole, while the first short rod disengages from the first limiting hole.

[0016] By adopting the above technical solution: when the first locking member and the first protrusion are loosened, the first spring can automatically spring open the first chair leg, so that the first long rod disengages from the bottom hole, and the first short rod disengages from the first limiting hole, thereby rotating the first chair leg and the chair back, improving the automation of rotation adjustment.

[0017] As a further improvement to the folding chair frame, the first chair leg is provided with a first shaft hole, and the end of the first shaft hole adjacent to the seat is enlarged into a first enlarged hole; the first protrusion adapts to pass through the first spring and the first shaft hole; when the first locking member and the first protrusion are in a fastened state, the first spring is compressed in the first enlarged hole.

[0018] By adopting the above technical solution: when the first locking member and the first protrusion are in a fastened state, the first chair leg and the chair seat are in contact, and the first spring is hidden inside, which improves the aesthetics and structural stability.

[0019] As a further improvement to the folding chair frame, the folding chair frame also includes a pad; the pad has two end faces that are tangent to the first chair leg and the chair seat, respectively; the first protrusion, the first long rod and the first short rod all pass through the pad.

[0020] By adopting the above technical solutions: the pad increases axial support, making axial rotation more stable, while reducing direct rotational wear between the first chair leg and the seat. The pad can be replaced, thus improving the service life of the first chair leg and the seat.

[0021] As a further improvement to the folding chair frame, the folding chair frame also includes a second chair leg away from the backrest, as well as a second locking member, a second long rod, a second short rod, and a second spring. The side of the chair seat that mates with the second chair leg has a second protrusion; the second chair leg has a second shaft hole; the end of the second shaft hole adjacent to the chair seat is enlarged into a second enlarged hole; the second protrusion adaptably passes through the second spring and the second shaft hole, and is fastened to the second locking member to press the second chair leg against the chair seat, so that the second spring is compressed within the second enlarged hole. The second long rod and the second short rod are both fixed to the second chair leg; the chair seat has a second arc-shaped hole and multiple second limiting holes. When the second locking member and the second protrusion are in a tightened state, the second long rod passes through the second arc-shaped hole, and the second short rod adaptably inserts into one of the second limiting holes; when the second locking member and the second protrusion are in a relaxed state, the second short rod disengages from the second limiting hole, while the second long rod does not disengage from the second arc-shaped hole.

[0022] By adopting the above technical solution, the rotational connection between the second chair leg and the seat is basically the same as that between the first chair leg and the seat. When the second locking member and the second protrusion are in a tightened state, the dual-axis rotation limiting mechanism of the second short rod and the second protrusion prevents the second chair leg from rotating relative to the seat. When the second locking member and the second protrusion are in a relaxed state, the second protrusion can uniaxially connect the second chair leg and the seat, and the second long rod can move along the second arc-shaped hole, that is, the second chair leg can rotate relative to the seat along the second arc-shaped hole.

[0023] Secondly, this application proposes a folding chair and adopts the following technical solution.

[0024] A folding chair, comprising the aforementioned folding chair frame.

[0025] By adopting the above technical solutions, the folding chair can adjust the backrest angle or the leg angle separately through the same control rotation mechanism, making the folding chair small in size, easy to adjust, and convenient to carry and move after storage.

[0026] In summary, this application has the following advantages: by using a set of control rotation mechanism that combines locking components and rotation limiting mechanism, the chair legs and backrest can be rotated to multiple angles relative to the seat and locked and fixed at the same time. Compared with some existing related folding chair solutions, this solution can adjust the backrest angle or the chair leg angle separately, and also reduces the number of control rotation mechanisms, making the folding chair frame small in size, simple in structure, and easy to carry and move after storage. Attached Figure Description

[0027] Figure 1 This is a diagram showing the unfolded structure of a folding chair frame.

[0028] Figure 2 for Figure 1 An exploded view of position A of the folding chair frame.

[0029] Figure 3 for Figure 1 A sectional view of the folding chair frame at position A.

[0030] Figure 4 for Figure 1 An enlarged structural diagram of the first leg of a folding chair frame.

[0031] Figure 5 for Figure 1 The diagram shows the structure of a folding chair frame in its stowed state.

[0032] Figure 6 for Figure 1 An exploded view of position B of the folding chair frame.

[0033] Reference numerals: 1. Seat; 2. Backrest; 3. First leg; 4. First locking element; 5. First protrusion; 6. First long rod; 7. Screw; 8. First arc-shaped hole; 9. First limiting hole; 10. Bottom hole; 11. First spring; 12. First shaft hole; 13. First enlarged hole; 14. Cylindrical sleeve; 15. Pad; 16. Second leg; 17. Second locking element; 18. Second spring; 19. Second long rod; 10. Second short rod; 103. Second protrusion; 104. Second arc-shaped hole; 105. Second limiting hole; 16. Ball. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] Please refer to Figure 1 A folding chair frame includes a seat 1, a backrest 2, and a first leg 3 adjacent to the backrest 2.

[0036] Please refer to Figure 2The folding chair frame also includes a first locking member 4 and a first rotation limiting mechanism. The seat 1, backrest 2, and first leg 3 can all be rod-shaped structures or frame structures formed by bending tubular structures.

[0037] The chair back 2 has a first protrusion 201, which can be a protruding straight rod. The first protrusion 201 can be located at the lower end of the chair back 2 and is horizontally positioned. The first protrusion 201 rotatably passes through the chair seat 1 and the first chair leg 3, and is connected to the first locking member 4. The first locking member 4 can be a screw cap with a screw threaded into the first protrusion 201. The first rotation limiting mechanism is fixed to the first chair leg 3 and can change its position relative to the chair seat 1 and the chair back 2 according to the change in the tightness between the first locking member 4 and the first protrusion 201, thereby simultaneously allowing the first chair leg 3 and the chair back 2 to rotate to multiple angles relative to the chair seat 1 and be simultaneously locked in place.

[0038] In the above scheme, a set of control rotation mechanism combining the first locking part 4 and the first rotation limiting mechanism is used to realize that the first chair leg 3 and the chair back 2 can rotate to multiple angles relative to the chair seat 1 and lock and fix them at the same time. It is not necessary to set up multiple sets of control rotation mechanisms to control the rotation of the first chair leg 3 and the chair back 2 relative to the chair seat 1 respectively, which makes the folding chair frame small in size and simple in structure.

[0039] Please continue reading. Figure 2 and Figure 3 In a preferred embodiment, the first rotation limiting mechanism includes a first long rod 5 and a first short rod 6, both fixed on the first chair leg 3. The rods of the first long rod 5 and the first short rod 6 can be located on the inner side of the first chair leg 3, and two screws 7 can be installed on the outer side of the first chair leg 3, passing through the first chair leg 3 and screwed into the first long rod 5 and the first short rod 6 respectively. The first long rod 5 and the first short rod 6 can be located on both sides of the first protrusion 201 respectively.

[0040] In the preferred embodiment described above, the seat 1 is provided with a first arc-shaped hole 101 and a plurality of first limiting holes 102, such as two or three first limiting holes 102, but not limited thereto. The backrest 2 is provided with a plurality of bottom holes 202, such as three bottom holes 202, or six, seven or eight bottom holes 202 distributed circumferentially, all of which are opened on the periphery of the first protrusion 201. Adjusting the relative position of the first locking member 4 and the first protrusion 201, such as rotating the first locking member 4 inward to a certain position, can make the first locking member 4 and the first protrusion 201 be in a tight state, and rotating the first locking member 4 outward to a certain position can make the first locking member 4 and the first protrusion 201 be in a loose state. When the first locking member 4 and the first protrusion 201 are in a tight state, the first long rod 5 passes through the first arc-shaped hole 101 and is adapted to be inserted into one of the bottom holes 202, while the first short rod 6 is adapted to be inserted into one of the first limiting holes 102. When the first locking member 4 and the first protrusion 201 are in a relaxed state, the first long rod 5 disengages from the bottom hole 202 and the first short rod 6 disengages from the first limiting hole 102.

[0041] Analysis of the above process shows that: when the first locking member 4 and the first protrusion 201 are in a tightened state, the first short rod 6 is inserted into the seat 1. Since the first short rod 6 and the first protrusion 201 are connected in series with the first chair leg 3 and the seat 1 respectively to form a double-axis brake, the rotation of the first chair leg 3 relative to the seat 1 is prevented, that is, the rotation of the first long rod 5 is prevented. Furthermore, since the first long rod 5 and the first protrusion 201 are connected in series with the seat 1 and the backrest 2 respectively to form a double-axis connection brake, the rotation of the backrest 2 relative to the seat 1 is prevented. When the first locking member 4 and the first protrusion 201 are in a tightened state, the first short rod 6 is inserted into the seat 1. Since the first short rod 6 and the first protrusion 201 are connected in series with the seat 1 and the backrest 2 respectively to form a double-axis connection brake, the rotation of the backrest 2 relative to the seat 1 is prevented. When component 4 and the first protrusion 201 are in a relaxed state, the first short rod 6 is not connected to the seat 1. The first long rod 5, fixed to the first chair leg 3, is inserted into the first arc-shaped hole 101 of the seat 1. The first protrusion 201 connects the first chair leg 3 and the seat 1, allowing the first long rod 5 to move along the first arc-shaped hole 101. That is, the first chair leg 3 can rotate relative to the seat 1 along the first arc-shaped hole 101. At the same time, the first long rod 5 is not connected to the backrest 2; only the first protrusion 201 connects the seat 1 and the backrest 2 on a single axis, allowing the backrest 2 to rotate relative to the seat 1. The above configuration, including the long and short rods, the arc-shaped hole, and the first protrusion 201, achieves a control rotation mechanism using a combination of a locking component and a first rotation limiting mechanism. This allows the first chair leg 3 and the backrest 2 to rotate to multiple angles relative to the seat 1 and simultaneously lock and fix them.

[0042] Please see Figure 2Optionally, the first arc-shaped hole 101 is a 90-130° arc shape, so that the first chair leg 3 and the chair seat 1 can rotate downward from a flat, folded state to a 90-130° supported state. Specifically, it can be configured such that when the first long rod 5 is located at the first end of the first arc-shaped hole 101, the first short rod 6 is adapted to be inserted into one of the first limiting holes 102, and correspondingly, the included angle between the first chair leg 3 and the chair seat 1 is 90-130°. When the first long rod 5 is located at the second end of the first arc-shaped hole 101, the first short rod 6 is adapted to be inserted into the other of the first limiting holes 102, and the included angle between the first chair leg 3 and the chair seat 1 is 0-10°, that is, a flat state, or a basically flat state. The above design allows the first chair leg 3 to rotate to an angle perpendicular to or slightly outward tilted to the chair seat 1, providing stable support. The first chair leg 3 can rotate to a state flush with the chair seat 1, achieving folding and storage, and the adjustment process is simple.

[0043] like Figure 2 In one optional embodiment of the number of bottom holes 202 on the chair back 2, the chair back 2 is provided with three bottom holes 202. When the first long rod 5 is located at the first end of the first arc-shaped hole 101, with the first bottom hole 202 aligning with the first long rod 5, the angle between the chair back 2 and the seat 1 is 90-105°, meaning the chair back 2 can be adjusted to be perpendicular to the seat 1 or slightly tilted backward. With the second bottom hole 202 aligning with the first end, the angle between the chair back 2 and the seat 1 is 120-135°, meaning it is further tilted backward to meet different leaning angle requirements. When the first long rod 5 is located at the second end of the first arc-shaped hole 101, with the third bottom hole 202 aligning with the first long rod 5, the angle between the chair back 2 and the seat 1 is 0-10°, meaning the chair back 2 is adjusted to be flush with or substantially flush with the seat 1.

[0044] like Figure 5 Optionally, the first chair leg 3 is aligned with the outer side of the seat 1, and the backrest 2 is aligned with the inner side of the seat 1, without crossing, making it easy to store.

[0045] As a second alternative embodiment of the number of bottom holes 202 on the chair back 2, the chair back 2 is provided with seven bottom holes 202 arranged circumferentially to meet the requirements of multi-point positioning, so that the included angle between the chair back 2 and the seat 1 is not limited to 90-105° and 120-135°, and the angle can be adjusted to a wider range.

[0046] In order to allow the first long rod 5 to automatically move out of the bottom hole 202 and the first short rod 6 to automatically move out of the first limiting hole 102 when the first locking member 4 is rotated outward to relax the first locking member 4 and the first protrusion 201, a first spring 8 is also provided between the first chair leg 3 and the chair seat 1. When the first locking member 4 and the first protrusion 201 are loosened, the first spring 8 can automatically spring open the first chair leg 3, so that the first long rod 5 disengages from the bottom hole 202, and the first short rod 6 disengages from the first limiting hole 102, thereby rotating the first chair leg 3 and the chair back 2, improving the automation of rotation adjustment.

[0047] Please see Figure 2 and Figure 4 As a preferred method for installing the first spring 8, the first chair leg 3 is provided with a first shaft hole 301, and the end of the first shaft hole 301 adjacent to the seat 1 is enlarged into a first enlarged hole 302. The first protrusion 201 of the chair back 2 fits through the first spring 8 and the first shaft hole 301; when the first locking member 4 and the first protrusion 201 are in a tightened state, the first spring 8 is compressed in the first enlarged hole 302. When the first locking member 4 and the first protrusion 201 are in a tightened state, the first chair leg 3 and the seat 1 are in contact, and the first spring 8 is hidden inside, improving aesthetics and structural stability.

[0048] The length difference between the first long rod 5 and the first short rod 6 can be equal to the thickness of the seat 1 through which the first long rod 5 passes. This allows the first short rod 6 to disengage from the first limiting hole 102 simultaneously with the first locking member 4 being unscrewed until the first long rod 5 disengages from the bottom hole 202, enabling the first chair leg 3 to rotate. Alternatively, the length difference between the first long rod 5 and the first short rod 6 can be less than the thickness of the seat 1 through which the first long rod 5 passes. This allows the first short rod 6 to remain inserted in the first limiting hole 102 when the first locking member 4 is unscrewed until the first long rod 5 disengages from the bottom hole 202, allowing the backrest 2 to rotate independently relative to the seat 1 without rotating the first chair leg 3, thus meeting certain usage requirements.

[0049] The first protrusion 201 of the chair back 2 can also be covered by a cylindrical sleeve 9 to isolate the first protrusion 201 from the rotational friction between the first protrusion 201 and the chair seat 1 and the first chair legs 3, thereby protecting the first protrusion 201. The cylindrical sleeve 9 can be replaced as needed after multiple uses. The cylindrical sleeve 9 can be made of polytetrafluoroethylene, which prevents friction between the metal parts and plays a role in noise reduction.

[0050] To reduce rotational wear between the first chair leg 3 and the seat 1, the folding chair frame also includes a pad 10. The pad 10 has two end faces tangent to the first chair leg 3 and the seat 1, respectively. The first protrusion 201, the first long rod 5, and the first short rod 6 all pass through the pad 10. The addition of the pad 10 reduces rotational resistance and improves rotational stability. The worn pad 10 can be replaced, indirectly increasing the service life of the first chair leg 3 and the seat 1. The pad 10 also increases axial support, making axial rotation more stable.

[0051] Please refer to Figure 6 The folding chair frame also includes a second chair leg 11 away from the backrest 2, a second locking member 12, a second rotation limiting mechanism, and a second spring 13. The second rotation limiting mechanism includes a second long rod 14 and a second short rod 15. The rotational connection structure between the second chair leg 11 and the seat 1 is similar to the rotational connection structure between the first chair leg 3 and the seat 1, as follows: The side of the seat 1 that mates with the second chair leg 11 has a second protrusion 103, which can be a protruding straight rod. The second protrusion 103 can be fitted with a cylindrical sleeve 9, or it can be left unfitted. A pad 10 can be provided between the second chair leg 11 and the seat 1, or it can be left unfitted. A second shaft hole is provided on the second chair leg 11. The end of the second shaft hole adjacent to the seat 1 is enlarged into a second enlarged hole. The mechanism of the second chair leg 11 is the same as that of the first chair leg 3, the structure of the second shaft hole is the same as that of the first shaft hole, and the structure of the second enlarged hole is the same as that of the first enlarged hole. The second protrusion 103 fits through the second spring 13 and the second shaft hole, and is fastened to the second locking member 12 to press the second chair leg 11 against the chair seat 1, so that the second spring 13 is compressed in the second enlarged hole. The second long rod 14 and the second short rod 15 are both fixed on the second chair leg 11; the chair seat 1 has a second arc-shaped hole 104 and a plurality of second limiting holes 105. When the second locking member 12 and the second protrusion 103 are in a fastened state, the second long rod 14 passes through the second arc-shaped hole 104, and the second short rod 15 fits into one of the second limiting holes 105; when the second locking member 12 and the second protrusion 103 are in a relaxed state, the second short rod 15 disengages from the second limiting hole 105, and the second long rod 14 does not disengage from the second arc-shaped hole 104.

[0052] As can be seen from the above, the rotational connection between the second chair leg 11 and the seat 1 is basically the same as the rotational connection between the first chair leg 3 and the seat 1. When the second locking member 12 and the second protrusion 103 are in a tightened state, the second chair leg 11 is prevented from rotating relative to the seat 1 by the dual-axis rotation limiting mechanism of the second short rod 15 and the second protrusion 103. When the second locking member 12 and the second protrusion 103 are in a relaxed state, the second protrusion 103 can uniaxially connect the second chair leg 11 and the seat 1, and the second long rod 14 can move along the second arc-shaped hole 104, that is, the second chair leg 11 can rotate relative to the seat 1 along the second arc-shaped hole 104.

[0053] This application discloses a folding chair, which includes the aforementioned folding chair frame. The bottom of both the first leg 3 and the second leg 11 of the folding chair frame can be fixed with a sphere 16 larger than the leg shaft, such as a 50mm sphere 16, to facilitate support on beaches or lawns. The contact area with the ground is approximately 10 times that of a single leg pad, preventing slippage and sinking. The sphere 16 can be made of rigid plastic, such as polyethylene. The folding chair frame can have two symmetrical first legs 3 and two symmetrical second legs 11, symmetrically mounted on the seat 1. This folding chair allows for individual adjustment of the backrest 2 angle or the leg angle via a single control rotation mechanism, resulting in a compact folding chair that is easy to adjust and convenient to carry and transport after storage.

[0054] The above are merely preferred embodiments of this application. The scope of protection of this application is not limited to the above embodiments. All technical solutions within the scope of this application's concept are within the scope of protection of this application. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of this application should also be considered within the scope of protection of this application.

Claims

1. A folding chair frame, comprising a seat (1), a backrest (2), and a first leg (3) adjacent to said backrest (2), characterized in that, The folding chair frame also includes a first locking member (4) and a first rotation limiting mechanism; the chair back (2) has a first protrusion (201); the first protrusion (201) rotatably passes through the chair seat (1) and the first chair leg (3) and is connected to the first locking member (4); the first rotation limiting mechanism is fixed on the first chair leg (3) and can change its position relative to the chair seat (1) and the chair back (2) according to the change in the tightness between the first locking member (4) and the first protrusion (201), so that the first chair leg (3) and the chair back (2) can be simultaneously allowed to rotate to multiple angles relative to the chair seat (1) and be locked and fixed at the same time; The first rotation limiting mechanism includes a first long rod (5) and a first short rod (6), both of which are fixed on the first chair leg (3); the chair seat (1) is provided with a first arc-shaped hole (101) and a plurality of first limiting holes (102); the chair back (2) is provided with a plurality of bottom holes (202). When the first locking member (4) and the first protrusion (201) are in a tightened state, the first long rod (5) passes through the first arc-shaped hole (101) and is adapted to be inserted into one of the bottom holes (202), while the first short rod (6) is adapted to be inserted into one of the first limiting holes (102); when the first locking member (4) and the first protrusion (201) are in a relaxed state, the first long rod (5) disengages from the bottom hole (202) and the first short rod (6) disengages from the first limiting hole (102).

2. The folding chair frame according to claim 1, characterized in that, The first arc-shaped hole (101) is a 90-130° arc; when the first long rod (5) is located at the first end of the first arc-shaped hole (101), the first short rod (6) is adapted to be inserted into one of the first limiting holes (102), and the included angle between the first chair leg (3) and the chair seat (1) is 90-130°; when the first long rod (5) is located at the second end of the first arc-shaped hole (101), the first short rod (6) is adapted to be inserted into another of the first limiting holes (102), and the included angle between the first chair leg (3) and the chair seat (1) is 0-10°.

3. The folding chair frame according to claim 2, characterized in that, The chair back (2) is provided with at least three bottom holes (202); when the first long rod (5) is located at the first end of the first arc-shaped hole (101), the first bottom hole (202) is connected to the first long rod (5), so that the included angle between the chair back (2) and the chair seat (1) is 90-105°, and the second bottom hole (202) is connected to the first end, so that the included angle between the chair back (2) and the chair seat (1) is 120-135°.

4. The folding chair frame according to claim 3, characterized in that, When the first long rod (5) is located at the second end of the first arc-shaped hole (101), the backrest (2) is connected to the first long rod (5) with the third bottom hole (202), so that the angle between the backrest (2) and the seat (1) is 0-10°, and the first leg (3) is located outside the seat (1), and the backrest (2) is located inside the seat (1).

5. The folding chair frame according to claim 1, characterized in that, The folding chair frame also includes a first spring (8), which is supported between the first chair leg (3) and the chair seat (1). It can extend as the tightness between the first locking member (4) and the first protrusion (201) decreases, so that the first chair leg (3) moves away from the chair seat (1), thereby causing the first long rod (5) to disengage from the bottom hole (202) and the first short rod (6) to disengage from the first limiting hole (102).

6. The folding chair frame according to claim 5, characterized in that, The first chair leg (3) is provided with a first shaft hole (301), and the first shaft hole (301) is enlarged into a first enlarged hole (302) at one end adjacent to the chair seat (1); the first protrusion (201) fits through the first spring (8) and the first shaft hole (301); when the first locking member (4) and the first protrusion (201) are in a fastened state, the first spring (8) is compressed in the first enlarged hole (302).

7. The folding chair frame according to claim 1, characterized in that, The folding chair frame also includes a pad (10); the pad (10) has two end faces that are tangent to the first chair leg (3) and the chair seat (1) respectively; the first protrusion (201), the first long rod (5) and the first short rod (6) all pass through the pad (10).

8. The folding chair frame according to any one of claims 1-7, characterized in that, The folding chair frame also includes a second chair leg (11) away from the backrest (2), a second locking member (12), a second long rod (14), a second short rod (15), and a second spring (13). The seat (1) has a second protrusion (103) on one side that fits against the second chair leg (11); the second chair leg (11) has a second shaft hole; the second shaft hole is enlarged into a second enlarged hole at one end adjacent to the seat (1); the second protrusion (103) fits through the second spring (13) and the second shaft hole, and is fastened to the second locking member (12) to press the second chair leg (11) against the seat (1), so that the second spring (13) is compressed in the second enlarged hole; The second long rod (14) and the second short rod (15) are both fixed on the second chair leg (11); the chair seat (1) has a second arc-shaped hole (104) and a plurality of second limiting holes (105); when the second locking member (12) and the second protrusion (103) are in a tightened state, the second long rod (14) passes through the second arc-shaped hole (104), and the second short rod (15) is adapted to be inserted into one of the second limiting holes (105); when the second locking member (12) and the second protrusion (103) are in a relaxed state, the second short rod (15) disengages from the second limiting hole (105), and the second long rod (14) does not disengage from the second arc-shaped hole (104).

9. A folding chair, characterized in that, Includes the folding chair frame as described in any one of claims 1-8.

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