Table and chair frame capable of being automatically folded

Abstract

The invention provides a table and chair frame capable of being automatically folded. The table and chair frame aims at solving the problem that in the prior art, a table and chair frame is inconvenient to operate by a user when folded. A table and chair frame capable of being automatically folded comprises a connecting base; the locking piece is used for switching the spiral seat between a locking state and a spiral lifting state; the elastic resetting piece is arranged between the central shaft and the connecting seat and is used for driving the central shaft to slide downwards relative to the connecting seat; and a plurality of support frames, the table and chair frame comprises an unfolded state and a folded state; when the table and chair frame is switched from the unfolded state to the folded state, the locking piece enables the spiral base to be switched to the spiral lifting state, under the action of the elastic reset piece, the center shaft descends relative to the connecting base and drives the spiral base to reversely rotate relative to the connecting base, and the center shaft drives the multiple supporting frames to be close to one another through the connecting rods. The table and chair frame can automatically complete the folding process and is convenient for a user to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of table and chair frames, and in particular relates to an automatically foldable table and chair frame. Background Art

[0002] At present, people are increasingly fond of going outdoors for camping, picnics or fishing during holidays. In order to facilitate people to use tables and chairs in outdoor camping and other scenes, some foldable and unfoldable tables and chairs have appeared on the market. After folding, such tables and chairs are small in size and occupy less space, so it is convenient for people to carry them in the trunk of a car. However, the folding frames used in current tables and chairs need to be folded manually, which is very inconvenient to operate and has a poor user experience. Summary of the invention

[0003] The invention provides an automatically foldable table and chair frame, aiming to solve the problem that the table and chair frame in the prior art is inconvenient for users to operate when folding.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An automatically foldable table and chair frame, characterized by comprising:

[0006] Connecting seat;

[0007] A lifting assembly, the lifting assembly comprising a central shaft slidably arranged on the connecting seat up and down, and a spiral seat sleeved outside the central shaft and spirally connected to the connecting seat, the spiral seat and the central shaft synchronously lifting up and down relative to the connecting seat; the spiral seat comprises a locking state and a spiral lifting state relative to the connecting seat;

[0008] A locking member, used to switch the spiral seat between a locking state and a spiral lifting state;

[0009] an elastic return member, disposed between the central shaft and the connecting seat and used to drive the central shaft to slide downward relative to the connecting seat; and

[0010] A plurality of support frames are arranged around the connecting seat, the upper end of each support frame is hinged to the connecting seat, a connecting rod is provided between each support frame and the lower end of the central shaft, and the two ends of the connecting rod are respectively hinged to the support frame and the lower end of the central shaft;

[0011] The table and chair frame includes an unfolded state and a folded state; when the table and chair frame is switched from the folded state to the unfolded state, an external force drives the plurality of support frames to move away from each other, and the plurality of support frames drive the central axis to rise relative to the connecting seat through a connecting rod, and the central axis drives the spiral seat to rotate and rise relative to the connecting seat in a positive direction, and the spiral seat switches to a spiral lifting state, and the elastic reset member is compressed, and when the table and chair frame is in the unfolded state, the locking member keeps the table and chair frame in the unfolded state by switching the spiral seat to a locked state;

[0012] When the table and chair frame switches from an unfolded state to a folded state, the spiral seat is switched to a spiral lifting state through the locking member, and under the action of the elastic reset member, the central axis descends relative to the connecting seat and drives the spiral seat to rotate in the opposite direction relative to the connecting seat, and the central axis drives several of the support frames to move closer to each other through the connecting rod.

[0013] A further solution: the locking member is slidably arranged on the central shaft and is circumferentially fixed to the central shaft; the lower end of the locking member is engaged with the spiral seat and the locking member limits the spiral seat from rotating in the opposite direction relative to the connecting seat by engaging with the spiral seat; an elastic driving member is provided between the upper end of the locking member and the upper end of the central shaft to drive the locking member to slide downward along the central shaft;

[0014] When the table and chair frame is unfolded, external force drives the plurality of support frames to move away from each other, and the plurality of support frames drive the central axis to rise relative to the connecting seat through the connecting rod, and the central axis drives the spiral seat to rotate and rise relative to the connecting seat in the positive direction, and the elastic reset member is compressed, and the locking member switches the spiral seat between a spiral lifting state and a locking state under the superposition of the positive rotation of the spiral seat and the elastic driving member; and when the table and chair frame is switched to the unfolded state, the spiral seat is switched to the locked state, the locking member and the spiral seat are engaged with each other, and the locking member restricts the spiral seat from rotating in the opposite direction relative to the connecting seat;

[0015] When the table and chair frame is folded, the locking piece is driven to slide upward along the central axis to disengage from the spiral seat so that the spiral seat is switched from a locked state to a spiral lifting state. Under the action of the elastic reset piece, the central axis descends relative to the connecting seat and drives the spiral seat to rotate in the opposite direction relative to the connecting seat, and the central axis drives several of the support frames to move closer to each other through the connecting rod.

[0016] Based on the above technical solution: by setting the locking piece and the central axis to be circumferentially fixed, that is, the locking piece and the central axis cannot rotate relative to the connecting seat, when the table and chair frame is in the unfolded state, the locking piece, under the action of the elastic driving piece, engages with the spiral seat to limit the reverse rotation of the spiral seat, thereby keeping the table and chair frame in the unfolded state; by setting the spiral seat to rotate forward relative to the connecting seat to switch to the spiral lifting state, it is convenient to unfold the table and chair frame; by setting the locking piece to be lifted upward to disengage from the spiral seat, the spiral seat is switched to the spiral lifting state. At this time, under the action of the elastic reset piece, the table and chair frame can be automatically folded, which is convenient for user operation.

[0017] A further solution is that a plurality of first engaging teeth are arranged around the lower end of the locking member, and a plurality of second engaging teeth are arranged around the upper end of the spiral seat; the plurality of first engaging teeth are arranged obliquely downward along the forward rotation direction of the spiral seat, and the plurality of second engaging teeth are arranged obliquely upward along the reverse rotation direction of the spiral seat;

[0018] Under the action of the elastic driving member, a plurality of the first engaging teeth and a plurality of the second engaging teeth engage with each other and restrict the spiral seat from rotating in the opposite direction relative to the connecting seat.

[0019] Based on the above technical solution: by setting a plurality of first engaging teeth that are all inclined downward along the forward rotation direction of the spiral seat, and a plurality of second engaging teeth that are all inclined upward along the reverse rotation direction of the spiral seat, when the table and chair frame is unfolded, the spiral seat rotates forward relative to the connecting seat, and rotates forward relative to the locking member. At this time, the second engaging teeth cooperate with the inclined surface of the first engaging teeth to drive the locking member to slide upward, thereby disengaging the locking member from the spiral seat, and facilitating the smooth unfolding of the table and chair frame; when the table and chair frame is smoothly unfolded, the first engaging teeth cooperate with the inclined surface of the second engaging teeth, so that the locking member can slide downward under the action of the elastic driving member, and then engage with the spiral seat, and limit the reverse rotation of the spiral seat, so that the table and chair frame remains in the unfolded state.

[0020] A further solution: an annular groove is provided at the upper end of the spiral seat, and a plurality of the second engaging teeth are arranged on the bottom wall of the annular groove;

[0021] The locking member comprises an engaging portion located in the annular groove in an engaged state and a handle portion higher than the side wall of the annular groove, and a plurality of the first engaging teeth are arranged on the engaging portion.

[0022] Based on the above technical solution: the locking piece is arranged in the annular groove, which facilitates the mutual engagement of the locking piece and the spiral seat, and facilitates the circumferential fixation of the locking piece and the center axis, and the structural design is more reasonable; by setting the handle higher than the side wall of the annular groove, it is convenient for the user to drive the locking piece to slide upward and disengage from the spiral seat.

[0023] A further solution: the elastic driving member is a first spring, and the first spring is sleeved on the central shaft and located between the upper end of the central shaft and the locking member.

[0024] A further solution: the locking piece is sleeved on the outside of the central axis; the central axis is provided with a limit groove extending in the up and down directions, the locking piece is provided with a limit block slidably arranged in the limit groove, and the limit block cooperates with the limit groove to fix the locking piece and the central axis circumferentially.

[0025] Based on the above technical solution: the above arrangement enables the locking member and the central axis to be circumferentially fixed and unable to rotate relative to each other, while the locking member can slide up and down relative to the central axis.

[0026] A further solution: a first step and a second step are provided on the central axis along the up-down direction, and the spiral seat is located between the first step and the second step.

[0027] Based on the above technical solution: the above arrangement enables the spiral seat and the central shaft to be axially fixed, that is, the spiral seat and the central shaft rise and fall synchronously relative to the connecting seat.

[0028] A further solution is that a hinge seat is provided at the lower end of the central axis, and one end of the connecting rod close to the hinge seat is hinged on the hinge seat.

[0029] A further solution: the elastic return member is a second spring, and the second spring is sleeved on the central axis and located between the connecting seat and the hinge seat.

[0030] A further solution is that the number of the supporting frames and the connecting rods is four, and the four supporting frames and the four connecting rods correspond one to one.

[0031] Based on the above technical solution: the four support frames make the table and chair frame more stable when used as a support for tables and chairs.

[0032] The beneficial effects of the present invention are:

[0033] The present invention provides a spiral connection between the spiral seat and the connecting seat, and the spiral seat and the central axis rise and fall synchronously, so that when the table and chair frame is folded or unfolded, the spiral seat and the central axis rise and fall synchronously relative to the connecting seat;

[0034] By providing a locking member and an elastic reset member, when the table and chair frame is switched from the unfolded state to the folded state, the user can disengage the locking member from the spiral seat, thereby switching the spiral seat to the spiral lifting state. At this time, under the action of the elastic reset member, the central shaft descends relative to the connecting seat and the central shaft drives the spiral seat to rotate and descend in the opposite direction relative to the connecting seat. During the descent process, the central shaft drives several support frames to move closer to each other through the connecting rod, thereby automatically switching the table and chair frame to the folded state, which is convenient for user operation.

[0035] When the table and chair frame is in the unfolded state, the locking piece cooperates with the spiral seat to put it in a locked state. In the locked state, the spiral seat cannot rotate relative to the central axis and the connecting seat, so that the spiral seat and the central axis cannot descend relative to the connecting seat, thereby keeping the table and chair frame in the unfolded state, which is more stable and convenient for people to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural schematic diagram of the table and chair frame of the present invention in a folded state.

[0038] Figure 2 It is a schematic structural diagram of the table and chair frame of the present invention in an unfolded state.

[0039] Figure 3 It is a schematic diagram of the cross-sectional structure of a table and chair frame.

[0040] Figure 4 It is a schematic diagram of the exploded structure of the table and chair frame.

[0041] Figure 5 It is a schematic diagram of the structure of the locking piece and the spiral seat.

[0042] Figure 6 It is a structural diagram of the connecting seat and the central shaft.

[0043] Description of the numbers in the figure:

[0044] 1-connecting seat; 11-installing groove; 12-support frame hinge groove; 121-first pin; 2-center axis; 21-limiting seat; 211-second pin; 212-limiting groove; 22-hinge seat; 221-lower hinge groove; 222-third pin; 23-first step; 24-second step; 3-support frame; 31-upper hinge groove; 311-fourth pin; 4-spiral seat; 41-annular groove; 42-second meshing tooth; 5-locking piece; 51-first meshing tooth; 52-limiting block; 6-first spring; 7-second spring; 8-connecting rod. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention.

[0046] like Figures 1 to 6 As shown, this embodiment is an automatically foldable table and chair frame, characterized by comprising:

[0047] Connecting seat 1;

[0048] A lifting assembly, the lifting assembly includes a central shaft 2 slidably arranged on the connecting seat 1 up and down, and a spiral seat 4 sleeved on the outside of the central shaft 2 and spirally connected to the connecting seat 1, the spiral seat 4 and the central shaft 2 are synchronously lifted up and down relative to the connecting seat 1; the spiral seat 4 includes a locked state and a spiral lifting state relative to the connecting seat 1;

[0049] A locking member 5, used to switch the spiral seat 4 between a locking state and a spiral lifting state;

[0050] an elastic return member, disposed between the central shaft 2 and the connecting seat 1 and used to drive the central shaft 2 to slide downward relative to the connecting seat 1; and

[0051] A plurality of support frames 3 are arranged around the connecting seat 1, the upper end of each support frame 3 is hinged to the connecting seat 1, a connecting rod 8 is provided between each support frame 3 and the lower end of the central shaft 2, and the two ends of the connecting rod 8 are respectively hinged to the lower ends of the support frame 3 and the central shaft 2;

[0052] The table and chair frame includes an unfolded state and a folded state; when the table and chair frame is switched from the folded state to the unfolded state, an external force drives the plurality of support frames 3 to move away from each other, and the plurality of support frames 3 drive the central axis 2 to rise relative to the connecting seat 1 through the connecting rod 8, and the central axis 2 drives the spiral seat 4 to rotate and rise relative to the connecting seat 1 in a positive direction, and the spiral seat 4 switches to a spiral lifting state, and the elastic reset member is compressed, and when the table and chair frame is in the unfolded state, the locking member 5 keeps the table and chair frame in the unfolded state by switching the spiral seat 4 to a locked state;

[0053] When the table and chair frame switches from the unfolded state to the folded state, the spiral seat 4 is switched to the spiral lifting state through the locking member 5. Under the action of the elastic reset member, the central axis 2 descends relative to the connecting seat 1 and drives the spiral seat 4 to rotate in the opposite direction relative to the connecting seat 1, and the central axis 2 drives several supporting frames 3 to move closer to each other through the connecting rod 8.

[0054] In some specific embodiments, the table and chair frame can be used on tables and chairs, and the connecting seat 1 is provided with a mounting groove 11 with the notch facing upward, and a through hole is provided at the bottom of the mounting groove 11, and the central axis 2 is passed through the through hole, and the outer wall of the spiral seat 4 is spirally connected with the inner wall of the mounting groove 11; when the central axis 2 slides upward relative to the connecting seat 1, the spiral seat 4 will be synchronously driven, so that the spiral seat 4 rotates forward relative to the connecting seat 1 and rises, and the same is true when descending; when the spiral seat 4 is in a locked state, the spiral seat 4 cannot rotate in the opposite direction relative to the connecting seat 1, and the table and chair frame remains in the expanded state.

[0055] In some specific embodiments, Figures 1 to 6 As shown, in order to facilitate the user to switch the table and chair frame to the unfolded state or the folded state, the locking member 5 is slidably arranged on the central axis 2 up and down and is circumferentially fixed to the central axis 2, that is, the locking member 5 cannot rotate relative to the central axis 2.

[0056] In some specific embodiments, the locking member 5 is slidably disposed on the central shaft 2 and is circumferentially fixed to the central shaft 2; the lower end of the locking member 5 is engaged with the spiral seat 4 and the locking member 5 restricts the spiral seat 4 from rotating in the opposite direction relative to the connecting seat 1 by engaging with the spiral seat 4; an elastic driving member is provided between the upper end of the locking member 5 and the upper end of the central shaft 2 to drive the locking member 5 to slide downward along the central shaft 2;

[0057] When the table and chair frame is unfolded, external force drives the several support frames 3 to move away from each other, and the several support frames 3 drive the central axis 2 to rise relative to the connecting seat 1 through the connecting rod, and the central axis 2 drives the spiral seat 4 to rotate and rise relative to the connecting seat 1, and the elastic reset member is compressed. The locking member 5 switches the spiral seat 4 between the spiral lifting state and the locking state under the superposition of the positive rotation of the spiral seat 4 and the elastic driving member; when the table and chair frame is switched to the unfolded state, the spiral seat 4 is switched to the locked state, and the locking member 5 and the spiral seat 4 are engaged with each other and the locking member 5 restricts The spiral seat 4 rotates in the opposite direction relative to the connecting seat 1; specifically, in the process of switching the table and chair frame from the folded state to the unfolded state, the spiral seat 4 rotates relative to the locking member 5 during the rising process, thereby driving the locking member 5 to slide upward along the central axis 2 and gradually disengage from the engagement with the spiral seat 4. After the spiral seat 4 rotates one engagement tooth relative to the locking member 5, the locking member 5 slides downward along the central axis 2 under the action of the elastic driving member and re-engages with the spiral seat 4, so that in the process of unfolding the table and chair frame, the locking member 5 and the spiral seat 4 repeat the process of disengagement and re-engagement, and finally after the table and chair frame is fully unfolded, the locking member 5 and the spiral seat 4 are engaged together;

[0058] When the table and chair frame is folded, the locking member 5 is driven to slide upward along the central axis 2 to disengage from the spiral seat 4, so that the spiral seat 4 switches from the locked state to the spiral lifting state. Under the action of the elastic reset member, the central axis 2 descends relative to the connecting seat 1 and drives the spiral seat 4 to rotate in the opposite direction relative to the connecting seat 1, and the central axis 2 drives the plurality of support frames 3 to move closer to each other through the connecting rod. Thus, the table and chair frame automatically switches to the folded state.

[0059] In some specific embodiments, Figures 3 to 5 As shown, a plurality of first engaging teeth are arranged around the lower end of the locking member, and a plurality of second engaging teeth are arranged around the upper end of the spiral seat;

[0060] A plurality of the first meshing teeth 51 are arranged obliquely downward along the forward rotation direction of the spiral seat 4, and a plurality of the second meshing teeth 42 are arranged obliquely upward along the reverse rotation direction of the spiral seat 4; that is, when the first meshing teeth 51 and the second meshing teeth 42 are meshed, they abut against each other on the inclined surface;

[0061] Since the locking member 5 is circumferentially fixed to the central axis 2 and the central axis 2 and the spiral seat 4 are raised and lowered synchronously, under the action of the elastic driving member, a plurality of the first engaging teeth 51 and a plurality of the second engaging teeth 42 engage with each other and restrict the spiral seat 4 from rotating in the opposite direction relative to the connecting seat 1. Specifically, when the table and chair frame is unfolded, the spiral seat 4 rotates and rises in the positive direction relative to the connecting seat 1, and the spiral seat 4 rotates in the positive direction relative to the locking member 5. At this time, the second engaging teeth 42 drive the locking member 5 to slide upward and disengage from the spiral seat 4 by cooperating with the inclined surface of the first engaging teeth 51, so as to facilitate the smooth unfolding of the table and chair frame. When the table and chair frame is switched to the unfolded state, due to the inclined surface cooperation of the first engaging teeth 51 and the second engaging teeth 42, the locking member 5 can slide downward along the central axis 2 under the action of the elastic driving member, so that the first engaging teeth 51 and the second engaging teeth 42 re-engage, thereby switching the spiral seat 4 to the locked state, and the locking member 5 restricts the spiral seat 4 from rotating in the opposite direction, so that the table and chair frame remains in the unfolded state.

[0062] In some specific embodiments, Figures 3 to 5 As shown, an annular groove 41 is provided at the upper end of the spiral seat 4, and the locking member 5 is located in the annular groove 41. Specifically, a plurality of second engaging teeth 42 are arranged on the bottom wall of the annular groove 41. The locking member 5 includes an engaging portion located in the annular groove 41 in an engaged state and a hand-held portion higher than the side wall of the annular groove 41, and a plurality of first engaging teeth 51 are arranged on the engaging portion. Specifically, a pull ring or the like can be provided on the locking member 5 to facilitate user operation. The elastic driving member is a first spring 6, which is sleeved on the central shaft 2 and is located between the upper end of the central shaft 2 and the locking member 5.

[0063] In some specific embodiments, Figures 3 to 5 As shown, the locking member 5 is sleeved on the outer side of the central shaft 2; the central shaft 2 is provided with a limiting groove 212 extending in the up-down direction, the locking member 5 is provided with a limiting block 52 slidably arranged in the limiting groove 212, and the limiting block 52 cooperates with the limiting groove 212 to fix the locking member 5 and the central shaft 2 circumferentially. Specifically, in order to facilitate assembly, a limiting seat 21 is provided at the upper end of the central shaft 2, the limiting groove 212 is sleeved on the central shaft 2 and fixed to the central shaft 2 by a second pin 211, there are two limiting grooves 212, which are respectively arranged on opposite sides of the limiting seat 21, there are two limiting blocks 52, which are respectively arranged on opposite sides of the inner wall of the locking member 5, and the two limiting blocks 52 are respectively stuck in the two limiting grooves 212.

[0064] In some specific embodiments, Figures 3 to 6As shown, the central shaft 2 is provided with a first step 23 and a second step 24 in the up-down direction, and the spiral seat 4 is located between the first step 23 and the second step 24. Specifically, the first step 23 and the second step 24 are both annular steps, and the first step 23 is provided at the lower side of the second step 24, that is, the diameter of the first step 23 is larger than the diameter of the through hole at the bottom of the mounting groove 11, so as to prevent the central shaft 2 from being separated from the connecting seat 1; the second step 24 is the lower end of the limiting seat 21, and the spiral seat 4 is limited between the first step 23 and the second step 24, so that the spiral seat 4 and the central shaft 2 are axially fixed, that is, the spiral seat 4 and the central shaft 2 are synchronously lifted up and down relative to the connecting seat 1.

[0065] In some specific embodiments, Figures 3 to 6 As shown, a hinge seat 22 is provided at the lower end of the central axis 2, and one end of the connecting rod 8 close to the hinge seat 22 is hinged on the hinge seat 22. There are four supporting frames 3 and connecting rods 8, and the four supporting frames 3 correspond to the four connecting rods 8 one by one. Specifically, four supporting frame hinge grooves 12 are provided around the connecting seat 1, and the upper end of each supporting frame 3 is hinged to the corresponding supporting frame hinge groove 12 through a first pin shaft 121. Four lower hinge grooves 221 are provided around the hinge seat 22, and each supporting frame 3 is provided with an upper hinge groove 31. One end of the connecting rod 8 is hinged to the corresponding lower hinge groove 221 through a third pin shaft 222, and the other end of the connecting rod 8 is hinged to the corresponding upper hinge groove 31 through a fourth pin shaft 311.

[0066] The elastic return member is a second spring 7 , which is sleeved on the central shaft 2 and located between the connecting seat 1 and the hinge seat 22 .

[0067] Working principle description:

[0068] When the table and chair frame is switched from the folded state to the unfolded state, the user drives the four support frames 3 to move away from each other, and the four support frames 3 respectively drive the central axis 2 to rise relative to the connecting seat 1 through the four connecting rods 8. At this time, the central axis 2 drives the spiral seat 4 to rotate forwardly relative to the connecting seat 1. When the spiral seat 4 rotates forwardly, it will drive the locking member 5 to slide upward along the central axis 2, so that the table and chair frame can be smoothly unfolded, and the elastic reset member is compressed during the unfolding process. When the table and chair frame is in the unfolded state, the locking member 5 slides downward along the central axis 2 under the action of the elastic driving member and re-engages with the spiral seat 4, so that the spiral seat 4 switches to the locked state. At this time, the spiral seat 4 cannot rotate in the opposite direction relative to the connecting seat 1, so that the table and chair frame remains in the unfolded state;

[0069] When the table and chair frame switches from the unfolded state to the folded state, the user can lift up the locking piece 5 to slide it upward and disengage from the spiral seat 4. At this time, the spiral seat 4 switches to the spiral lifting state. Under the action of the elastic reset piece, the central axis 2 descends relative to the connecting seat 1 and drives the spiral seat 4 to rotate in the opposite direction and descend relative to the connecting seat 1. The central axis 2 drives the four supporting frames 3 to move closer to each other through the four connecting rods 8, so that the table and chair frame is automatically folded.

[0070] The present invention is not limited to the above optional implementation modes. Under the premise of not conflicting with each other, the various schemes can be combined arbitrarily. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in their shapes or structures, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. An automatically foldable table and chair frame, characterized in that: include: Connecting seat; A lifting assembly, the lifting assembly comprising a central shaft slidably arranged on the connecting seat up and down, and a spiral seat sleeved outside the central shaft and spirally connected to the connecting seat, the spiral seat and the central shaft synchronously lifting up and down relative to the connecting seat; the spiral seat comprises a locking state and a spiral lifting state relative to the connecting seat; A locking member, used to switch the spiral seat between a locking state and a spiral lifting state; an elastic return member, disposed between the lower end of the central shaft and the connecting seat and used to drive the central shaft to slide downward relative to the connecting seat; and A plurality of support frames are arranged around the connecting seat, the upper end of each support frame is hinged to the connecting seat, a connecting rod is provided between each support frame and the lower end of the central shaft, and the two ends of the connecting rod are respectively hinged to the support frame and the lower end of the central shaft; The table and chair frame includes an unfolded state and a folded state; when the table and chair frame is switched from the folded state to the unfolded state, an external force drives the plurality of support frames to move away from each other, and the plurality of support frames drive the central axis to rise relative to the connecting seat through a connecting rod, and the central axis drives the spiral seat to rotate and rise relative to the connecting seat in a positive direction, and the spiral seat switches to a spiral lifting state, and the elastic reset member is compressed, and when the table and chair frame is in the unfolded state, the locking member keeps the table and chair frame in the unfolded state by switching the spiral seat to a locked state; When the table and chair frame switches from an unfolded state to a folded state, the spiral seat is switched to a spiral lifting state through the locking member, and under the action of the elastic reset member, the central axis descends relative to the connecting seat and drives the spiral seat to rotate in the opposite direction relative to the connecting seat, and the central axis drives several of the support frames to move closer to each other through the connecting rod.

2. The automatically foldable table and chair frame according to claim 1, characterized in that: The locking member is slidably arranged on the central shaft and is circumferentially fixed to the central shaft; the lower end of the locking member is engaged with the spiral seat and the locking member limits the spiral seat from rotating in the opposite direction relative to the connecting seat by engaging with the spiral seat; an elastic driving member is provided between the upper end of the locking member and the upper end of the central shaft to drive the locking member to slide downward along the central shaft; When the table and chair frame is unfolded, external force drives the plurality of support frames to move away from each other, and the plurality of support frames drive the central axis to rise relative to the connecting seat through the connecting rod, and the central axis drives the spiral seat to rotate and rise relative to the connecting seat in the positive direction, and the elastic reset member is compressed, and the locking member switches the spiral seat between a spiral lifting state and a locking state under the superposition of the positive rotation of the spiral seat and the elastic driving member; and when the table and chair frame is switched to the unfolded state, the spiral seat is switched to the locked state, the locking member and the spiral seat are engaged with each other, and the locking member restricts the spiral seat from rotating in the opposite direction relative to the connecting seat; When the table and chair frame is folded, the locking piece is driven to slide upward along the central axis to disengage from the spiral seat so that the spiral seat is switched from a locked state to a spiral lifting state. Under the action of the elastic reset piece, the central axis descends relative to the connecting seat and drives the spiral seat to rotate in the opposite direction relative to the connecting seat, and the central axis drives several of the support frames to move closer to each other through the connecting rod.

3. The automatically foldable table and chair frame according to claim 2, characterized in that: A plurality of first engaging teeth are arranged around the lower end of the locking member, and a plurality of second engaging teeth are arranged around the upper end of the spiral seat; the plurality of first engaging teeth are arranged obliquely downward along the forward rotation direction of the spiral seat, and the plurality of second engaging teeth are arranged obliquely upward along the reverse rotation direction of the spiral seat; Under the action of the elastic driving member, a plurality of the first engaging teeth and a plurality of the second engaging teeth engage with each other and restrict the spiral seat from rotating in the opposite direction relative to the connecting seat.

4. The automatically foldable table and chair frame according to claim 3, characterized in that: An annular groove is provided at the upper end of the spiral seat, and a plurality of the second engaging teeth are arranged on the bottom wall of the annular groove; The locking member comprises an engaging portion located in the annular groove in an engaged state and a handle portion higher than the side wall of the annular groove, and a plurality of the first engaging teeth are arranged on the engaging portion.

5. The automatically foldable table and chair frame according to claim 2, characterized in that: The elastic driving member is a first spring, which is sleeved on the central shaft and located between the upper end of the central shaft and the locking member.

6. The automatically foldable table and chair frame according to claim 1, characterized in that: The locking piece is sleeved on the outside of the central axis; the central axis is provided with a limiting groove extending in the up and down directions, the locking piece is provided with a limiting block slidably arranged in the limiting groove, and the limiting block cooperates with the limiting groove to fix the locking piece and the central axis circumferentially.

7. The automatically foldable table and chair frame according to claim 1, characterized in that: The central axis is provided with a first step and a second step along the up-down direction, and the spiral seat is located between the first step and the second step.

8. The automatically foldable table and chair frame according to claim 1, characterized in that: A hinge seat is arranged at the lower end of the central shaft, and one end of the connecting rod close to the hinge seat is hinged on the hinge seat.

9. The automatically foldable table and chair frame according to claim 8, characterized in that: The elastic return member is a second spring, and the second spring is sleeved on the central axis and located between the connecting seat and the hinge seat.

10. The automatically foldable table and chair frame according to claim 1, characterized in that: The number of the supporting frames and the connecting rods is four, and the four supporting frames correspond to the four connecting rods one by one.

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