Table and chair frame capable of being automatically folded

Abstract

The utility model 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 utility model belongs to the technical field of table and chair frame, and particularly relates to a table and chair frame capable of being automatically folded. BACKGROUND

[0002] At present, people are more and more fond of camping, picnic or fishing in holidays, and in order to facilitate people to use tables and chairs in the outdoor camping scene, some foldable and unfoldable tables and chairs appear on the market. The tables and chairs are small in size and occupy small space after being folded, so that people can conveniently carry them in the trunk of a car. However, the folding frame used on the current tables and chairs needs to be manually folded when being folded, which is very inconvenient to operate and has poor user experience. SUMMARY

[0003] The utility model provides a table and chair frame capable of being automatically folded, and aims to solve the problem that the table and chair frame in the prior art is inconvenient for users to operate when being folded.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A table and chair frame capable of being automatically folded, characterized by comprising:

[0006] a connecting seat;

[0007] a lifting assembly, the lifting assembly comprising a central shaft sliding up and down on the connecting seat and a spiral seat sleeved outside the central shaft and screw-connected with the connecting seat, the spiral seat being synchronous with the central shaft to lift up and down relative to the connecting seat; the spiral seat comprising a locking state and a spiral lifting state relative to the connecting seat;

[0008] a locking piece for switching the spiral seat between the locking state and the spiral lifting state;

[0009] a resilient reset piece arranged between the central shaft and the connecting seat and used for driving the central shaft to slide downward relative to the connecting seat; and

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

[0011] The table and chair frame comprises an unfolded state and a folded state; when the table and chair frame is switched from the folded state to the unfolded state, external force drives a plurality of the support frames to move away from each other, the plurality of the support frames drive the central shaft to move upward relative to the connecting seat through the connecting rods, the central shaft drives the spiral seat to move upward relative to the connecting seat through positive rotation, the spiral seat is switched to the 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 the locked state;

[0012] When the table and chair frame is switched from the unfolded state to the folded state, the spiral seat is switched to the spiral lifting state through the locking member, the central shaft moves downward relative to the connecting seat and drives the spiral seat to move in the reverse direction relative to the connecting seat under the action of the elastic reset member, and the central shaft drives the plurality of the support frames to move close to each other through the connecting rods.

[0013] Further scheme: the locking member is arranged on the central shaft in sliding mode and is fixed in the circumferential direction of the central shaft; the lower end of the locking member is connected to the spiral seat in interlocking mode, and the locking member limits the reverse rotation of the spiral seat relative to the connecting seat through interlocking with the spiral seat; and an elastic driving member is arranged 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 a plurality of the support frames to move away from each other, the plurality of the support frames drive the central shaft to move upward relative to the connecting seat through the connecting rods, the central shaft drives the spiral seat to move upward relative to the connecting seat through positive rotation, the elastic reset member is compressed, and the locking member switches the spiral seat between the spiral lifting state and the locked state under the superimposed action 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 is interlocked with the spiral seat, and the locking member limits the reverse rotation of the spiral seat relative to the connecting seat;

[0015] When the table and chair frame is folded, the spiral seat is switched from the locked state to the spiral lifting state by driving the locking member to slide upward along the central shaft and move away from the spiral seat, the central shaft moves downward relative to the connecting seat and drives the spiral seat to move in the reverse direction relative to the connecting seat under the action of the elastic reset member, and the central shaft drives the plurality of the support frames to move close to each other through the connecting rods.

[0016] Based on the above technical scheme: by setting the locking member and the central shaft circumferentially fixed, that is, the locking member and the central shaft cannot rotate relative to the connecting seat, so that when the table and chair frame is in the unfolded state, the locking member is engaged with the spiral seat under the action of the elastic driving member 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 relative to the connecting seat forward rotating to switch to the spiral lifting state, thereby facilitating the unfolding of the table and chair frame; by setting the locking member to be lifted upward to be disengaged 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 table and chair frame can be automatically folded, which is convenient for the user to operate.

[0017] Further scheme: a plurality of first engagement teeth are arranged around the lower end of the locking member, and a plurality of second engagement teeth are arranged around the upper end of the spiral seat; the plurality of first engagement teeth are all arranged obliquely downward along the forward rotation direction of the spiral seat, and the plurality of second engagement teeth are all arranged obliquely upward along the reverse rotation direction of the spiral seat.

[0018] Under the action of the elastic driving member, the plurality of first engagement teeth and the plurality of second engagement teeth are engaged with each other and limit the reverse rotation of the spiral seat relative to the connecting seat.

[0019] Based on the above technical scheme: by setting the plurality of first engagement teeth to be all arranged obliquely downward along the forward rotation direction of the spiral seat, and the plurality of second engagement teeth to be all arranged obliquely upward along the reverse rotation direction of the spiral seat, when unfolding the table and chair frame, the spiral seat rotates forward relative to the connecting seat and relative to the locking member, at this time the second engagement teeth drive the locking member to slide upward by cooperating with the inclined surface of the first engagement teeth, thereby disengaging the locking member from the spiral seat, facilitating the smooth unfolding of the table and chair frame; after the table and chair frame is unfolded smoothly, the first engagement teeth make the locking member slide downward under the action of the elastic driving member by cooperating with the inclined surface of the second engagement teeth, thereby engaging with the spiral seat together and limiting the reverse rotation of the spiral seat, so that the table and chair frame is kept in the unfolded state.

[0020] Further scheme: the upper end of the spiral seat is provided with an annular groove, and the plurality of second engagement teeth are arranged on the bottom wall of the annular groove.

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

[0022] Based on the above technical scheme: the locking member is arranged in the annular groove, which facilitates the mutual engagement of the locking member and the spiral seat, and facilitates the circumferential fixation of the locking member and the central shaft, and the structure design is more reasonable; by setting the lifting part to be higher than the side wall of the annular groove, the user can drive the locking member to slide upward and disengage from the spiral seat.

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

[0024] Further scheme: the locking member is sleeved outside the central shaft; the central shaft is provided with a limiting groove extending in the up-down direction; the locking member is provided with a limiting block slidingly arranged in the limiting groove; and the limiting block fixes the locking member and the central shaft in the circumferential direction through cooperation with the limiting groove.

[0025] Based on the above technical scheme: the above arrangement enables the locking member and the central shaft to be fixed in the circumferential direction and unable to rotate relative to each other, while the locking member can slide up and down relative to the central shaft.

[0026] Further scheme: the central shaft is provided with a first step and a second step in the up-down direction, and the spiral seat is located between the first step and the second step.

[0027] Based on the above technical scheme: the above arrangement enables the spiral seat and the central shaft to be fixed in the axial direction, i.e., the spiral seat and the central shaft are synchronously raised and lowered relative to the connecting seat.

[0028] Further scheme: the lower end of the central shaft is provided with a hinged seat, and one end of each of the connecting rods close to the hinged seat is hinged to the hinged seat.

[0029] Further scheme: the elastic reset member is a second spring, the second spring is sleeved on the central shaft and located between the connecting seat and the hinged seat.

[0030] Further scheme: the number of the supporting frames and the connecting rods is four, and the four supporting frames and the four connecting rods are in one-to-one correspondence.

[0031] Based on the above technical scheme: the four supporting frames make the table and chair frame more stable in supporting.

[0032] The table and chair frame has the following beneficial effects:

[0033] The spiral seat and the connecting seat are spirally connected, and the spiral seat and the central shaft are synchronously raised and lowered, so that the table and chair frame is raised and lowered relative to the connecting seat during folding or unfolding.

[0034] By setting a locking element and an elastic reset element, when the table and chair frame is switched from the unfolded state to the folded state, the user can disengage the locking element from the screw seat, thereby switching the screw seat to the screw lifting state. At this time, under the action of the elastic reset element, the central shaft descends relative to the connecting seat, and the central shaft drives the screw seat to rotate in the opposite direction relative to the connecting seat and descend. During the descent, 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 the user to operate.

[0035] When the table and chair frame is in the unfolded state, the locking device engages with the screw seat to lock it in the locked state. In the locked state, the screw seat cannot rotate relative to the central axis and the connecting seat, thus preventing the screw seat and the central axis from descending relative to the connecting seat. This keeps the table and chair frame in the unfolded state, making it more stable and convenient for people to use. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a structural diagram of the table and chair frame of this utility model in the folded state.

[0038] Figure 2 This is a structural diagram of the table and chair frame of this utility model in its unfolded state.

[0039] Figure 3 This is a cross-sectional structural diagram of the table and chair frame.

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

[0041] Figure 5 This is a structural diagram of the locking element and the screw seat.

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

[0043] Explanation of the labels in the diagram:

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

[0045] The technical solutions in the embodiments of the utility model will be clearly and completely described in connection with the drawings in the embodiments of the utility model. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0046] As shown in the drawings, the table and chair frame of the utility model can be automatically folded, which comprises: Figures 1 to 6

[0047] connecting seat 1;

[0048] lifting assembly, the lifting assembly comprises center shaft 2 that is arranged on connecting seat 1 and slides up and down, and spiral seat 4 that is arranged outside center shaft 2 and is screw-connected with connecting seat 1, spiral seat 4 and center shaft 2 are synchronously lifted up and down relative to connecting seat 1, spiral seat 4 relative to connecting seat 1 comprises locking state and spiral lifting state;

[0049] locking piece 5 is used to switch spiral seat 4 between locking state and spiral lifting state;

[0050] elastic reset piece is arranged between center shaft 2 and connecting seat 1 and is used to drive center shaft 2 to slide down relative to connecting seat 1; and,

[0051] a plurality of support frames 3 are arranged around connecting seat 1, the upper end of each support frame 3 is hinged with connecting seat 1, linkage 8 is arranged between each support frame 3 and the lower end of center shaft 2, and both ends of linkage 8 are hinged with support frame 3 and the lower end of center shaft 2 respectively;

[0052] ​The table and chair frame comprises an unfolded state and a folded state; when the table and chair frame is switched from the folded state to the unfolded state, external force drives a plurality of the support frames 3 to move away from each other, the plurality of the support frames 3 drive the central shaft 2 to move upward relative to the connecting seat 1 through the connecting rod 8, the central shaft 2 drives the spiral seat 4 to move upward relative to the connecting seat 1 through forward rotation, the spiral seat 4 is switched to the 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 the locking state.

[0053] When the table and chair frame is switched from the unfolded state to the folded state, the spiral seat 4 is switched to the spiral lifting state through the locking member 5, the central shaft 2 moves downward relative to the connecting seat 1 and drives the spiral seat 4 to move downward relative to the connecting seat 1 through reverse rotation under the action of the elastic reset member, and the central shaft 2 drives the plurality of the support frames 3 to move close to each other through the connecting rod 8.

[0054] In some embodiments, the table and chair frame can be used on a table or a chair, the connecting seat 1 is provided with a mounting groove 11 with a notch upward, the bottom of the mounting groove 11 is provided with a through hole, the central shaft 2 is arranged through the through hole, and the outer side wall of the spiral seat 4 is spirally connected with the inner side wall of the mounting groove 11; when the central shaft 2 slides upward relative to the connecting seat 1, the spiral seat 4 is driven to move upward relative to the connecting seat 1 through forward rotation, and the same applies when the central shaft 2 slides downward; when the spiral seat 4 is in the locking state, the spiral seat 4 cannot move downward relative to the connecting seat 1, and at this time, the table and chair frame is kept in the unfolded state.

[0055] In some embodiments, as shown in Figures 1 to 6 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 arranged on the central shaft 2 through upward and downward sliding and is fixed circumferentially with the central shaft 2, that is, the locking member 5 cannot rotate relative to the central shaft 2.

[0056] In some embodiments, the locking member 5 is arranged on the central shaft 2 through upward and downward sliding and is fixed circumferentially with the central shaft 2; the lower end of the locking member 5 is connected with the spiral seat 4 through mutual engagement and the locking member 5 limits the reverse rotation of the spiral seat 4 relative to the connecting seat 1 through mutual engagement with the spiral seat 4, and an elastic driving member for driving the locking member 5 to slide downward along the central shaft 2 is arranged between the upper end of the locking member 5 and the upper end of the central shaft 2.

[0057] When the table and chair frame is unfolded, external force drives a plurality of the support frames 3 to move away from each other, the plurality of the support frames 3 drive the central shaft 2 to ascend relative to the connecting seat 1 through the connecting rod, the central shaft 2 drives the spiral seat 4 to ascend and rotate forward relative to the connecting seat 1, the elastic reset member is compressed, and the locking member 5 switches the spiral seat 4 between the spiral ascending state and the locking state under the superimposed action of the forward 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 locking state, the locking member 5 engages with the spiral seat 4 and restricts the reverse rotation of the spiral seat 4 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 in the ascending process to drive the locking member 5 to slide upward along the central shaft 2 and gradually disengage from the engagement with the spiral seat 4, when the spiral seat 4 rotates one engagement tooth relative to the locking member 5, the locking member 5 slides downward along the central shaft 2 under the action of the elastic driving member to re-engage with the spiral seat 4, so that the locking member 5 and the spiral seat 4 repeatedly disengage and re-engage in the process of unfolding the table and chair frame, and finally the locking member 5 and the spiral seat 4 are engaged together after the table and chair frame is completely unfolded.

[0058] When the table and chair frame is folded, the spiral seat 4 is switched from the locking state to the spiral ascending state by driving the locking member 5 to slide upward along the central shaft 2 and disengage from the spiral seat 4, under the action of the elastic reset member, the central shaft 2 descends relative to the connecting seat 1 and drives the spiral seat 4 to rotate reversely relative to the connecting seat 1, and the central shaft 2 drives a plurality of the support frames 3 to move close to each other through the connecting rod. Thus, the table and chair frame is automatically switched to the folded state.

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

[0060] A plurality of the first engagement teeth 51 are arranged downwardly inclined along the forward rotation direction of the spiral seat 4, and a plurality of the second engagement teeth 42 are arranged upwardly inclined along the reverse rotation direction of the spiral seat 4; that is, when the first engagement teeth 51 and the second engagement teeth 42 engage with each other, they abut against each other on the inclined surface;

[0061] Since the locking piece 5 is fixed in the circumferential direction of the central shaft 2 and the central shaft 2 is synchronous with the screw seat 4, under the action of the elastic driving piece, the plurality of first engagement teeth 51 and the plurality of second engagement teeth 42 are engaged with each other and limit the reverse rotation of the screw seat 4 relative to the connecting seat 1. Specifically, when the table and chair frame is unfolded, the screw seat 4 rotates forward relative to the connecting seat 1 and rises, and the screw seat 4 rotates forward relative to the locking piece 5, at this time, the second engagement teeth 42 drive the locking piece 5 to slide upward and away from the screw seat 4 through the cooperation with the inclined surface of the first engagement teeth 51, facilitating the smooth unfolding of the table and chair frame. When the table and chair frame is switched to the unfolded state, due to the cooperation of the inclined surface of the first engagement teeth 51 and the second engagement teeth 42, the locking piece 5 can slide downward along the central shaft 2 under the action of the elastic driving piece, so that the first engagement teeth 51 and the second engagement teeth 42 are re-engaged, thereby switching the screw seat 4 to the locked state, and the locking piece 5 limits the reverse rotation of the screw seat 4, so that the table and chair frame remains in the unfolded state.

[0062] In some embodiments, as shown in Figures 3 to 5 The upper end of the screw seat 4 is provided with an annular groove 41, and the locking piece 5 is located in the annular groove 41. Specifically, a plurality of second engagement teeth 42 are arranged on the bottom wall of the annular groove 41. The locking piece 5 includes an engagement part located in the annular groove 41 in the engaged state and a handle part higher than the side wall of the annular groove 41, and a plurality of first engagement teeth 51 are arranged on the engagement part. A pull ring or the like can also be arranged on the locking piece 5 for convenient user operation. The elastic driving piece is a first spring 6, which is sleeved on the central shaft 2 and located between the upper end of the central shaft 2 and the locking piece 5.

[0063] In some embodiments, as shown in Figures 3 to 5 The locking piece 5 is sleeved on the outside of the central shaft 2; the central shaft 2 is provided with a limiting groove 212 extending in the upward and downward directions, the locking piece 5 is provided with a limiting block 52 slidingly arranged in the limiting groove 212, and the limiting block 52 is fixed in the circumferential direction of the central shaft 2 by cooperating with the limiting groove 212. Specifically, in order to facilitate assembly, the upper end of the central shaft 2 is provided with a limiting seat 21, the limiting groove 212 is sleeved on the central shaft 2 and is fixed with the central shaft 2 through a second pin shaft 211, the limiting groove 212 has two, which are arranged on the opposite sides of the limiting seat 21 respectively, the limiting block 52 has two, which are arranged on the opposite sides of the inner side wall of the locking piece 5 respectively, and the two limiting blocks 52 are respectively clamped in the two limiting grooves 212.

[0064] In some embodiments, as shown in Figures 3 to 6As shown, the center 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, the first step 23 is arranged on 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 avoid the center 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 center shaft 2 are axially fixed, that is, the spiral seat 4 and the center shaft 2 are synchronously raised and lowered relative to the connecting seat 1.

[0065] In some embodiments, as shown in the drawings, Figures 3 to 6 As shown, the lower end of the center shaft 2 is provided with a hinged seat 22, and one end of each of the connecting rods 8 is hinged to the hinged seat 22. The number of the support frames 3 and the connecting rods 8 is four, and the four support frames 3 and the four connecting rods 8 are one-to-one corresponding. Specifically, four support frame hinged grooves 12 are arranged around the connecting seat 1, and the upper end of each support frame 3 is hinged to the corresponding support frame hinged groove 12 through a first pin shaft 121. Four lower hinged grooves 221 are arranged around the hinged seat 22, and each support frame 3 is provided with an upper hinged groove 31, one end of the connecting rod 8 is hinged to the corresponding lower hinged groove 221 through a third pin shaft 222, and the other end of the connecting rod 8 is hinged to the corresponding upper hinged groove 31 through a fourth pin shaft 311.

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

[0067] Working principle:

[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 drive the center shaft 2 to rise relative to the connecting seat 1 through the four connecting rods 8. At this time, the center shaft 2 drives the spiral seat 4 to rotate forward relative to the connecting seat 1, and the spiral seat 4 drives the locking member 5 to slide upward along the center shaft 2 when rotating forward, so that the table and chair frame is smoothly unfolded, and the elastic return member is compressed in the process of unfolding. When the table and chair frame is in the unfolded state, the locking member 5 slides downward along the center shaft 2 under the action of the elastic driving member and re-engages with the spiral seat 4, so that the spiral seat 4 is switched to the locked state, and the spiral seat 4 cannot rotate reversely 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 is switched from the unfolded state to the folded state, the user can lift the locking piece 5 upward to make it slide upward and disengage from the spiral seat 4, at this time the spiral seat 4 is switched to the spiral lifting state, under the action of the elastic reset piece, the central shaft 2 is lowered relative to the connecting seat 1 and drives the spiral seat 4 to rotate reversely and descend relative to the connecting seat 1, and the central shaft 2 drives the four supporting frames 3 to approach each other through the four connecting rods 8, so that the table and chair frame is automatically folded.

[0070] The utility model is not limited to the above optional implementation, and under the premise of not contradicting each other, each scheme can be combined arbitrarily; anyone can derive other various forms of products under the enlightenment of the utility model, but no matter any change in shape or structure, any technical scheme falling within the scope defined by the claims of the utility model falls within the protection scope of the utility model.

Claims

1. An auto-foldable table and chair frame, characterized by, The table and chair frame comprises: a connecting base; a lifting assembly comprising a central shaft sliding up and down on the connecting base and a screw base sleeved outside the central shaft and screw-connected with the connecting base, the screw base being synchronous with the central shaft to lift up and down relative to the connecting base; the screw base relative to the connecting base comprising a locking state and a screw lifting state; a locking member for switching the screw base between the locking state and the screw lifting state; a resilient reset member arranged between the lower end of the central shaft and the connecting base and for driving the central shaft to slide down relative to the connecting base; and a plurality of support frames arranged around the connecting base, the upper end of each support frame being hinged with the connecting base, a connecting rod being arranged between each support frame and the lower end of the central shaft and the two ends of the connecting rod being respectively hinged with the support frame and the lower end of the central shaft; the table and chair frame comprising an unfolded state and a folded state; when the table and chair frame is switched from the folded state to the unfolded state, external force drives the plurality of support frames to move away from each other, the plurality of support frames drive the central shaft to lift up relative to the connecting base through the connecting rod, the central shaft drives the screw base to positively rotate and lift up relative to the connecting base, the screw base is switched to the screw lifting state, and the resilient 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 screw base to the locking state; when the table and chair frame is switched from the unfolded state to the folded state, the screw base is switched to the screw lifting state by the locking member, the central shaft is lowered relative to the connecting base and drives the screw base to negatively rotate relative to the connecting base under the action of the resilient reset member, and the central shaft drives the plurality of support frames to move close to each other through the connecting rod.

2. The self-folding table and chair frame of claim 1, wherein, the locking member being slidingly arranged on the central shaft and being fixed in the circumferential direction of the central shaft; the lower end of the locking member being engaged with the screw base, and the locking member limiting the screw base from negatively rotating relative to the connecting base by being engaged with the screw base; the upper end of the locking member being provided with a resilient driving member for driving the locking member to slide down 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, the plurality of support frames drive the central shaft to lift up relative to the connecting base through the connecting rod, the central shaft drives the screw base to positively rotate and lift up relative to the connecting base, the resilient reset member is compressed, and the locking member switches the screw base between the screw lifting state and the locking state under the superimposed action of the positive rotation of the screw base and the resilient driving member; and when the table and chair frame is switched to the unfolded state, the screw base is switched to the locking state, the locking member is engaged with the screw base, and the locking member limits the screw base from negatively rotating relative to the connecting base. When the table and chair frame is folded, the helical seat is switched from the locking state to the helical lifting state by driving the locking member to slide upward along the central shaft and out of the helical seat, under the action of the elastic reset member, the central shaft descends relative to the connecting seat and drives the helical seat to rotate reversely relative to the connecting seat, and the central shaft drives several support frames to approach each other through the connecting rods.

3. The self-folding table and chair frame of claim 2, wherein, A plurality of first engagement teeth are arranged around the lower end of the locking member, and a plurality of second engagement teeth are arranged around the upper end of the helical seat; the plurality of first engagement teeth are arranged downwardly and obliquely in the forward rotation direction of the helical seat, and the plurality of second engagement teeth are arranged upwardly and obliquely in the reverse rotation direction of the helical seat. Under the action of the elastic driving member, the plurality of first engagement teeth and the plurality of second engagement teeth are engaged with each other and limit the reverse rotation of the helical seat relative to the connecting seat.

4. The self-folding table and chair frame of claim 3, wherein, The upper end of the helical seat is provided with an annular groove, and the plurality of second engagement teeth are arranged on the bottom wall of the annular groove. The locking member includes an engagement portion located in the annular groove in the engagement state and a carrying portion higher than the side wall of the annular groove, and the plurality of first engagement teeth are arranged on the engagement portion.

5. The self-folding table and chair frame of claim 2, wherein, 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 self-folding table and chair frame of claim 1, wherein, The locking member is sleeved on the outside of the central shaft; the central shaft is provided with a limiting groove extending in the upward and downward directions, the locking member is provided with a limiting block slidingly arranged in the limiting groove, and the limiting block fixes the locking member and the central shaft circumferentially by cooperating with the limiting groove.

7. The self-folding table and chair frame of claim 1, wherein, The central shaft is provided with a first step and a second step in the upward and downward directions, and the helical seat is located between the first step and the second step.

8. The self-folding table and chair frame of claim 1, wherein, The lower end of the central shaft is provided with a hinged seat, and one end of the connecting rod close to the hinged seat is hinged on the hinged seat.

9. An auto-folding bench and table frame according to claim 8, wherein, The elastic reset member is a second spring, which is sleeved on the central shaft and located between the connecting seat and the hinged seat.

10. The self-folding table and chair frame of claim 1, wherein, The plurality of support frames and connecting rods are four, and the four support frames and the four connecting rods correspond one by one.

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