CN219330995U

CN219330995U - Lifting structure of table and chair feet, table and chair

Info

Publication number: CN219330995U
Application number: CN202223200819.1U
Authority: CN
Inventors: 杨于新; 杨益民
Original assignee: Taizhou Seeking Exhibition Industry And Trade Co ltd
Current assignee: Taizhou Seeking Exhibition Industry And Trade Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-07-14
Anticipated expiration: 2032-11-29

Abstract

The utility model provides a lifting structure of desk and chair legs, a desk and a chair, and belongs to the technical field of desks and chairs. It has solved the lower problem of current table chair suitability. The lifting structure of the table and chair feet comprises a first lifting component and a second lifting component, wherein the first lifting component and the second lifting component are respectively arranged on two sides of a table plate or a chair plate, the first lifting component comprises a first fixing rod fixedly connected with the table feet or the chair feet and a first telescopic rod connected with the first fixing rod in a lifting manner, the second lifting component is fixed on the first telescopic rod, the second lifting component is provided with a second telescopic rod which can lift relatively to the first lifting component and is used for being connected with the table plate or the chair plate, and the first lifting component can drive the second lifting component to lift. The lifting structure of the table and chair feet can promote the lifting stroke of the table and chair feet, so that the existing school desk and chair for students lying and sleeping in noon break can be updated without replacing the desk.

Description

Lifting structure of table and chair feet, table and chair

Technical Field

The utility model belongs to the technical field of desks and chairs, and relates to a lifting structure of desk and chair legs, a desk and a chair.

Background

In order to improve the noon break quality of students, noon break desk and chair which can lie down are uniformly replaced in schools, but the lifting adjustment of the noon break desk and chair of the first generation is inconvenient, and the students are usually adjusted by hand shaking or pulling and inserting fasteners into the school.

Such as chinese patent application [ application publication No.: CN107637971a discloses a lifting student chair, which comprises a chair surface, a backrest plate, a backrest frame, a left side plate, a right side plate, chair legs and bolts, wherein the relative positions of the chair legs and the chair legs are adjusted through adjusting the height adjusting holes of the left side plate and/or the right side plate, and the chair legs are fixed by the bolts.

The structure adopts the way of pulling and inserting the fastener to adjust, but the adjusting mode is difficult, especially other sundries such as books and the like can be piled under the existing student chair, the existing desk leg adjusting mode is similar to the chair leg adjusting mode, the problem of difficult adjustment exists, and the maximum adjusting height of the desk leg is half of the length of the desk leg by adopting the way of pulling and inserting to adjust, so that the height which can be reduced by the desk leg is limited; also the maximum adjustment height of the chair leg is a general rule for the length of the chair leg, resulting in a limited elevation of the chair leg.

The existing improved lifting table and chair usually needs a table and a chair to be matched for use, for example, the table legs of the table are required to be lowered to a preset height, otherwise, the table is blocked when the chair is reclined, so that the upper space of the table plate cannot be reasonably utilized, the whole space in the teaching room is limited, the whole group of the table and chair cannot be replaced for the reclining space of the chair, the old table and chair is wasted, the applicability of the table and chair is reduced, the reutilization of the existing resources is not facilitated, and the replacement cost required after the table and chair are updated is higher.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides a lifting structure of desk and chair legs, a desk and a chair, and the technical problems to be solved by the utility model are as follows: how to solve the problem of lower applicability of the existing table and chair.

The aim of the utility model can be achieved by the following technical scheme:

the utility model provides a lifting structure of table chair foot, includes lifting unit I and lifting unit II that all set up in table or chair board both sides, its characterized in that, lifting unit I includes the dead lever I that all links firmly with table foot or chair foot and goes up and down to connect the telescopic link I on the dead lever I, lifting unit II is fixed on telescopic link I, lifting unit II is last to be equipped with lifting unit I relatively and to go up and down and be used for the telescopic link II of being connected with table or chair board, and lifting unit I can drive lifting unit II and go up and down.

When students take lessons, the students only need to adjust the desk and the chair to the corresponding positions through the lifting component I and the lifting component II, the lifting component II is provided with the lifting rod II which can lift relative to the lifting component I through the telescopic rod I and is connected with the desk plate or the chair plate, so that the telescopic stroke of the lifting component I and the lifting component II is increased, when students need to lie and sleep in noon, the students firstly adjust the desk or the chair to the corresponding height through the lifting component I and the lifting component II and then put the chair back down, the chair back of the chair is arranged above the desk at the moment, thereby reasonably utilizing the space above the desk, and the lying and sleeping can be realized by directly replacing the chair without replacing the existing desk due to the limited descending height of the existing desk, the chair is directly replaced with the chair in the proposal, the chair in the proposal is used by the matching of the lifting component I and the lifting component II, the lifting stroke of the chair is promoted, the height of the chair can be regulated, the chair back of the chair can be positioned above the existing desk after being laid down, thus realizing that the desk does not need to be replaced, the chair can be updated for the existing desk and chair of the student for sleeping and noon break, the applicability of the chair is promoted, the desk is also matched with the lifting component I and the lifting component II, the lifting stroke of the desk is also promoted, the desk can be reduced to a lower height before lying and sleeping, the giving way of legs of the student is realized, the space after the desk is reduced is further compressed during noon break, the legs of the student are convenient to be placed, and the desk with different heights can be better regulated, so that the applicability of the table is also greatly improved.

In the lifting structure of the table and chair legs, the first lifting assembly is provided with two lifting assemblies, the second lifting assembly is located between the first lifting assemblies, the second lifting assembly comprises a second fixing rod, the upper end of the second fixing rod is fixedly connected with the first two telescopic rods and is higher than the upper end of the first telescopic rod, the second telescopic rod is connected to the second fixing rod in a lifting mode, and the upper end of the second telescopic rod is fixedly connected with the table or the chair plate.

Through being provided with two lifting unit I, lifting unit II's dead lever second links firmly with two lifting unit II's telescopic link first, has promoted lifting unit II and has connected stability, and through setting up the upper end of dead lever second to be higher than telescopic link first for dead lever second is located between two lifting unit I for the dead lever is mostly, and the table chair foot can descend to lower height when descending, thereby further promotion table chair foot's lift stroke promotes the suitability of table chair foot.

In the lifting structure of the table and chair legs, a lifting lever I with the middle part connected with the lifting lever I is arranged in the lifting lever I, a pushing block capable of transversely extending out of the lifting lever I is arranged at the upper end of the lifting lever I, an elastic piece is connected with the lower end of the lifting lever I, a limiting hole for the elastic piece to be partially inserted is formed in the upper part of the fixing rod I, and when the pushing block is pushed into the lifting lever I, the lifting lever I swings around a connecting point to the elastic piece to retract and the elastic piece moves out of the limiting hole.

The lifting lever I is arranged in the telescopic rod I, and the length of the lifting lever I is only required to be not smaller than that of the telescopic rod I, so that the length of the lifting lever I can be set to be longer, smaller thrust can be adopted when the pushing block is required to be pushed, and the lifting height of the desk and chair legs is required to be adjusted frequently, so that the lifting lever I is set to be longer, and the use and adjustment of a user are more convenient; after the adjustment is completed, the pushing block automatically resets under the action of the elastic force of the elastic piece, so that the first telescopic rod and the first fixed rod are vertically positioned, and the whole adjustment process is more convenient.

The elastic piece is a U-shaped elastic piece, one end of the U-shaped elastic piece is connected with the outer side wall of the lifting lever I, one end of the U-shaped elastic piece is provided with a limiting head capable of penetrating through the limiting hole, and the other end of the U-shaped elastic piece abuts against the inner side wall of the telescopic rod I.

In the lifting structure of the table and chair feet, the lifting structure comprises the lifting deflector rod, the connecting sleeves for the pushing blocks to be placed are sleeved at the upper ends of the first telescopic rod, the lifting deflector rod is arranged between the two connecting sleeves, the two ends of the lifting deflector rod are inserted into the corresponding connecting sleeves, the lifting deflector rod can lift along the connecting sleeves, and the lifting deflector rod can move upwards and push the pushing blocks into the first telescopic rod.

Through being provided with the lifting deflector rod, and the both ends of lifting deflector rod insert corresponding adapter sleeve, push away the pushing block into telescopic link one when lifting deflector rod dial up this moment, can accomplish the unblock to two pushing blocks simultaneously through the lifting deflector rod, promote the convenience of use to but unblock simultaneously also is convenient for two lifting assemblies one can synchronous height-adjusting, avoid appearing an adjustable one condition of not adjusting, can promote the convenience of regulation when guaranteeing structural stability; after the adjustment is completed, the pushing block pushes the lifting deflector rod to reset under the action of elasticity, so that the whole adjustment process is more convenient.

In the lifting structure of the table and chair feet, the pushing block is provided with the pushing wall which is inclined outwards from bottom to top, the lifting deflector rod is a round rod which is arranged transversely, the lifting deflector rod can be abutted against the pushing wall, the connecting sleeve is provided with the limiting sliding groove vertically, and the end part of the lifting deflector rod is inserted into the corresponding limiting sliding groove and is lifted along the limiting sliding groove.

The pushing wall is inclined outwards, a certain guiding effect can be achieved when the lifting deflector rod is upwards stirred, and through the arrangement of the limiting sliding groove, the lifting deflector rod can only vertically slide without lateral deviation, the shape of the lifting deflector rod is set, friction force between the lifting deflector rod and the pushing block can be reduced, and stirring adjustment of the lifting deflector rod is more convenient.

In the lifting structure of the table and chair legs, the middle part of the lifting deflector rod is sleeved with the poking sleeve, the poking sleeve is provided with a poking plate which is transversely arranged and a limiting plate which is vertically arranged, the limiting plate is arranged close to the second fixing rod, and the poking plate extends outwards towards a direction away from the second fixing rod.

The setting of limiting plate avoids stirring the board and upwards lifts the in-process along lifting lever circumference rotation, and stir the setting of board, convenient to use's use and regulation, further promoted the convenience that elevation structure used.

In the lifting structure of the table and chair feet, the lifting structure further comprises a connecting cross rod, two ends of the connecting cross rod are respectively fixedly connected with the upper ends of the first telescopic rods, the second fixing rod is inserted in the middle of the connecting cross rod and fixedly connected with the connecting cross rod, and the upper end of the second fixing rod is higher than the upper end face of the connecting cross rod.

Through the setting of connecting the horizontal pole for connecting the dead lever two and two telescopic links one is more firm, and is connected the dead lever two with the middle part of connecting the horizontal pole, further promoted the stability of dead lever two, and the dead lever two sets up with the relative position of connecting the horizontal pole, makes the dead lever two be located between two lifting unit one for the dead lever two, and the table chair foot can descend to lower height when descending, thereby further promotion table chair foot's lift stroke promotes the suitability of table chair foot.

In the lifting structure of the table and chair legs, a lifting lever II with the middle part connected with the lifting lever II is arranged in the lifting lever II, one end of the lifting lever II extends out of the lifting lever II and is positioned in the fixing lever II, a push button capable of transversely extending out of the lifting lever II is arranged at the upper end of the lifting lever II, an elastic limiting part is connected with the lower end of the lifting lever II, a plurality of positioning holes for the elastic limiting part to be partially inserted are formed in the fixing lever II, all the positioning holes are distributed reversely along the length of the fixing lever II, and when the push button is pressed, the lifting lever II swings around a connecting point to retract to the elastic limiting part and the elastic limiting part moves out of the positioning holes.

The lifting lever II is arranged in the telescopic rod II, and the length of the lifting lever II is only required to be not smaller than that of the telescopic rod II, so that the length of the lifting lever II can be set to be longer, smaller pressing force can be adopted when a push button needs to be pressed, and the lifting height of a desk and chair foot needs to be adjusted frequently, so that the lifting lever II is set to be longer, and the use and adjustment of a user are more convenient; after the adjustment is completed, the push button is automatically reset under the action of the elastic force of the elastic limiting piece, so that the second telescopic rod and the second fixed rod are vertically positioned, and the whole adjustment process is more convenient.

The table is characterized in that the lifting structure is arranged in the table.

The setting of this structure has increased the lift stroke of table foot to guarantee the stability of regulation through being provided with two lifting assembly one, and through the setting of lifting driving lever, the synchronous regulation of two lifting assembly one of being convenient for, further promotion the convenience that the desk used.

The chair is characterized in that the lifting structure is arranged in the chair.

The setting of this structure has increased the lift stroke of chair foot to guarantee the stability of regulation through being provided with two lifting assembly one, and through the setting of lifting driving lever, the synchronous regulation of two lifting assembly one of being convenient for, further promotion chair use's convenience. In addition, for the existing noon break desk and chair capable of lying and sleeping, the chair can be lifted to a higher height, so that the existing desk with a lower adjusting stroke can also be used for realizing the function of lying and sleeping.

Compared with the prior art, the utility model has the advantages that: when the descending height of the existing noon break desk is limited, the height of the chair can be adjusted, the chair back of the chair can be located above the existing desk after being laid down, and therefore the desk does not need to be replaced, the existing student lying noon break desk and chair can be updated, the applicability of the chair is improved, the desk is matched with the lifting assembly I and the lifting assembly II, the lifting stroke of the desk is improved, the space of the desk after being lowered during noon break is further compressed, legs of students are placed conveniently, and students with different heights can be better adjusted through the desk of the application, so that the applicability of the desk is improved greatly.

Drawings

Fig. 1 is a schematic view of a structure in which a chair of the present utility model is laid flat.

Figure 2 is a schematic view of the chair according to the utility model.

Figure 3 is a schematic view of the assembly of the first lifting assembly, the second lifting assembly and the foot of the chair according to the present utility model.

Figure 4 is a top view of the first and second lift assemblies and the chair foot assembly of the present utility model.

Fig. 5 is a cross-sectional view of A-A in fig. 4.

Fig. 6 is a cross-sectional view of B-B of fig. 4.

Fig. 7 is a partial enlarged view at a in fig. 6.

Fig. 8 is a schematic view of a part of the structure of the present utility model.

Fig. 9 is a schematic view of the structure of the table according to the present utility model.

In the figure, 1, a table plate; 2. a chair plate; 3. a lifting assembly I; 31. a first fixed rod; 31a, a limiting hole; 32. a first telescopic rod; 32a, notch; 33. lifting lever I; 34. a pushing block; 34a, push wall; 35. connecting sleeves; 35a, limiting sliding grooves; 4. lifting assembly II; 41. a second fixing rod; 41a, positioning holes; 42. a second telescopic rod; 42a, relief holes; 43. lifting lever II; 44. pushing the button; 5. an elastic member; 51. a positioning head; 6. lifting the deflector rod; 61. the sleeve is stirred; 62. a toggle plate; 63. a limiting plate; 7. connecting the cross bars; 8. an elastic limiting piece; 81. a positioning head; 9. a table foot; 10. a chair foot.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

Example 1

As shown in figure 1, the lifting structure of the table and chair legs comprises a lifting component I3 and a lifting component II 4 which are arranged on two sides of a table board 1 or a chair board 2.

Specifically, as shown in fig. 1 to 9, the lifting component one 3 includes a fixing rod one 31 fixedly connected with the table foot 9 or the chair foot 10 and a telescopic rod one 32 connected to the fixing rod one 31 and capable of lifting, the lifting component one 3 is provided with two lifting components two 4, the lifting component two 4 is located between the two lifting components one 3, the lifting component two 4 includes a fixing rod two 41 and a telescopic rod two 42 connected to the fixing rod two 41 and capable of lifting, the upper end of the fixing rod two 41 is fixedly connected with the two telescopic rods one 32 and higher than the upper end of the telescopic rod one 32, the telescopic rod two 42 is connected to the fixing rod two 41 and capable of lifting, the upper end of the telescopic rod two 42 is fixedly connected with the table board 1 or the chair board 2, and the lifting component one 3 can drive the lifting component two 4 to lift.

When students take lessons, the students only need to adjust the desk and the chair to the corresponding positions through the lifting component I3 and the lifting component II 4, and the lifting component II 4 is fixedly connected with the lifting component II 4 through the telescopic rod I32 of the lifting component I3, the lifting component II 4 is provided with the telescopic rod II 42 which can lift relative to the lifting component I3, and the telescopic rod II 42 is connected with the desk board 1 or the chair board 2, so that the telescopic stroke of the lifting component I3 and the lifting component II 4 is increased, when the students need to lie at noon break and the like, the students firstly adjust the desk or the chair to the corresponding height through the lifting component I3 and the lifting component II 4, then put the chair back to be flat, and the chair back of the chair is arranged above the desk at the moment, so that the space above the desk can be reasonably utilized, and the existing desk can be replaced due to the limited descending height of the existing desk, the chair can be directly replaced to realize lying and sleeping, the chair in the proposal is used by the cooperation of the lifting component I3 and the lifting component II 4, the lifting stroke of the chair is improved, when the descending height of the existing desk is limited, the chair back of the chair can be positioned above the existing desk after being laid down by adjusting the height of the chair, thus realizing that the desk does not need to be replaced, upgrading the existing desk and chair for students to lie and sleep in noon break, improving the applicability of the chair, the desk also adopts the cooperation of the lifting component I3 and the lifting component II 4, the lifting stroke of the desk is also improved, the desk can be reduced to a lower height before lying and sleeping, the yielding of legs of students is realized, the space after the desk is reduced in noon break is further compressed, be convenient for student's shank place to the student of different heights, the accessible is this application's desk carries out better adjustment, makes the suitability of desk also obtain great promotion.

As shown in fig. 6-8, a lifting lever 33 with the middle part connected with the lifting lever 32 is arranged in the lifting lever 32, one end of the lifting lever 33 extends out of the lifting lever 32 and is positioned in the fixing lever 31, the upper end of the lifting lever 33 is provided with a pushing block 34 which can transversely extend out of the lifting lever 32, the pushing block 34 is a triangular block, the pushing block 34 is provided with a pushing wall 34a which is arranged obliquely outwards from bottom to top, the upper end of the lifting lever 32 is provided with a notch 32a for the pushing block 34 to be arranged, the lower end of the lifting lever 33 is connected with an elastic piece 5, the upper end of the fixing lever 31 is provided with a limiting hole 31a for the elastic piece 5 to be partially inserted, when the pushing block 34 is pushed into the lifting lever 32, the lifting lever 33 swings around a connecting point to retract and the elastic piece 5 moves out of the limiting hole 31a, one end of the elastic piece 5 is a U-shaped elastic piece, one end of the U-shaped elastic piece is connected with the outer side wall of the lifting lever 33, one end of the U-shaped elastic piece is provided with a limiting head 51 which can be arranged in the limiting hole 31a in a penetrating way, and the other end of the U-shaped elastic piece is abutted against the elastic piece 32.

As shown in fig. 5-8, the lifting structure comprises a lifting deflector rod 6, wherein connecting sleeves 35 for placing pushing blocks 34 are sleeved at the upper ends of a first telescopic rod 32, the lifting deflector rod 6 is arranged between the two connecting sleeves 35, two ends of the lifting deflector rod 6 are inserted into the corresponding connecting sleeves 35, the lifting deflector rod 6 can lift along the connecting sleeves 35, the lifting deflector rod 6 can move upwards and push the pushing blocks 34 into the first telescopic rod 32, the lifting deflector rod 6 is a round rod which is transversely arranged, the lifting deflector rod 6 can abut against a pushing wall 34a, limiting sliding grooves 35a are vertically formed in the connecting sleeves 35, the end parts of the lifting deflector rod 6 are inserted into the corresponding limiting sliding grooves 35a and lift along the limiting sliding grooves 35a, a stirring sleeve 61 is sleeved in the middle of the lifting deflector rod 6, the stirring sleeve 61 is provided with a stirring plate 62 which is transversely arranged and a limiting plate 63 which is vertically arranged, the limiting plate 63 is arranged close to a second fixed rod 41, and the stirring plate 62 extends outwards in a direction away from the second fixed rod 41.

As shown in fig. 1-3, the lifting structure further comprises a connecting cross rod 7, two ends of the connecting cross rod 7 are respectively fixedly connected with the upper ends of the first two telescopic rods 32, the second fixing rod 41 is inserted in the middle of the connecting cross rod 7 and fixedly connected with the connecting cross rod 7, and the upper end of the second fixing rod 41 is higher than the upper end face of the connecting cross rod 7.

As shown in fig. 1-5, a lifting lever two 43 with a middle part connected with the lifting lever two 42 is arranged in the lifting lever two 42, a yielding hole 42a through which a push button 44 passes is formed in the lifting lever two 42, one end of the lifting lever two 43 extends out of the lifting lever two 42 and is positioned in the fixing lever two 41, a push button 44 which can transversely pass through the yielding hole 42a is arranged at the upper end of the lifting lever two 43, an elastic limiting piece 8 is connected at the lower end of the lifting lever two 43, a plurality of positioning holes 41a into which the elastic limiting piece 8 can be partially inserted are formed in the fixing lever two 41, all the positioning holes 41a are reversely distributed along the length of the fixing lever two 41, and when the push button 44 is pressed, the lifting lever two 43 swings around a connecting point until the elastic limiting piece 8 retracts and the elastic limiting piece 8 moves out of the positioning holes 41a. The elastic limiting piece 8 is a U-shaped elastic piece, one end of the U-shaped elastic piece is connected with the outer side wall of the lifting lever II 43, one end of the U-shaped elastic piece is provided with a positioning head 81 which can be penetrated in the positioning hole 41a, and the other end of the U-shaped elastic piece abuts against the inner side wall of the telescopic rod II 42.

Example two

The content of this embodiment is basically the same as that of the first embodiment, except that:

the elastic piece 5 is a limiting pin fixedly connected to the lower end of the lifting lever 33 and a reset spring, the limiting pin can be inserted into the limiting hole 31a, the limiting pin is arranged on the side wall of one side of the lifting lever 33, and the reset spring is arranged on the side wall of the other side of the lifting lever 33 and has a tendency of enabling the limiting pin to move towards the limiting hole 31 a.

Example III

the elastic limit will be a limit pin and a reset spring which are fixedly connected to the lower end of the lifting lever II 43, the limit pin can be inserted into the positioning hole 41a, the limit pin is arranged on the side wall of one side of the lifting lever II 43, and the reset spring is arranged on the side wall of the other side of the lifting lever II 43 and has a trend that the limit pin moves towards the positioning hole 41a.

Example IV

a table is provided with the lifting structure of the first embodiment, the second embodiment or the third embodiment.

Example five

a chair is provided with the lifting structure of the first embodiment, the second embodiment or the third embodiment.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The utility model provides a lifting structure of table chair foot, includes lift subassembly one (3) and lift subassembly two (4) that all set up in table (1) or chair board (2) both sides, its characterized in that, lift subassembly one (3) including all with table foot (9) or chair foot (10) fixed pole one (31) and connect on fixed pole one (31) and telescopic link one (32) that can go up and down, lift subassembly two (4) are fixed on telescopic link one (32), be equipped with on lift subassembly two (4) can go up and down relative lift subassembly one (3) and be used for with table (1) or chair board (2) connected telescopic link two (42), and lift subassembly one (3) can drive lift subassembly two (4) and go up and down.

2. The lifting structure of a table and chair foot according to claim 1, wherein the lifting assembly one (3) is provided with two lifting assemblies two (4) are located between the lifting assemblies one (3), the lifting assemblies two (4) comprise a fixing rod two (41), the upper end of the fixing rod two (41) is fixedly connected with the two telescopic rods one (32) and higher than the upper end of the telescopic rod one (32), the telescopic rod two (42) is connected to the fixing rod two (41) and can lift, and the upper end of the telescopic rod two (42) is fixedly connected with the table plate (1) or the chair plate (2).

3. The lifting structure of a table and chair foot according to claim 2, wherein a lifting lever one (33) with the middle part connected with the lifting lever one (32) is arranged in the lifting lever one (32), one end of the lifting lever one (33) extends out of the lifting lever one (32) and is positioned in the fixing lever one (31), a pushing block (34) capable of transversely extending out of the lifting lever one (32) is arranged at the upper end of the lifting lever one (33), an elastic piece (5) is connected to the lower end of the lifting lever one (33), a limiting hole (31 a) for the elastic piece (5) to be partially inserted is formed in the upper part of the fixing lever one (31), and when the pushing block (34) is pushed into the lifting lever one (32), the lifting lever one (33) swings around a connecting point until the elastic piece (5) retracts and the elastic piece (5) moves out of the limiting hole (31 a).

4. A lifting structure for a table and chair foot according to claim 3, characterized in that the lifting structure comprises a lifting deflector rod (6), wherein the upper ends of the first telescopic rods (32) are respectively sleeved with a connecting sleeve (35) for placing a pushing block (34), the lifting deflector rod (6) is arranged between the two connecting sleeves (35) and two ends of the lifting deflector rod (6) are inserted into the corresponding connecting sleeves (35), the lifting deflector rod (6) can lift along the connecting sleeves (35), and the lifting deflector rod (6) can move upwards and push the pushing block (34) into the first telescopic rods (32).

5. The lifting structure of a table and chair foot according to claim 4, wherein the pushing block (34) is provided with a pushing wall (34 a) which is inclined outwards from bottom to top, the lifting deflector rod (6) is a round rod which is arranged transversely, the lifting deflector rod (6) can be abutted against the pushing wall (34 a), the connecting sleeve (35) is provided with a limiting chute (35 a) along the vertical direction, and the end part of the lifting deflector rod (6) is inserted into the corresponding limiting chute (35 a) and is lifted along the limiting chute (35 a).

6. The lifting structure of a table and chair foot according to claim 4, wherein the middle part of the lifting deflector rod (6) is sleeved with a poking sleeve (61), the poking sleeve (61) is provided with a poking plate (62) which is transversely arranged and a limiting plate (63) which is vertically arranged, the limiting plate (63) is arranged close to the second fixed rod (41), and the poking plate (62) extends outwards in a direction away from the second fixed rod (41).

7. The lifting structure of a table and chair foot according to any one of claims 2-4, further comprising a connecting cross rod (7), wherein two ends of the connecting cross rod (7) are respectively fixedly connected with the upper ends of the first two telescopic rods (32), the second fixing rod (41) is inserted in the middle of the connecting cross rod (7) and fixedly connected with the connecting cross rod (7), and the upper end of the second fixing rod (41) is higher than the upper end face of the connecting cross rod (7).

8. The lifting structure of a table and chair foot according to any one of claims 2-4, wherein a lifting lever two (43) with the middle part connected with the lifting lever two (42) is arranged in the lifting lever two (42), one end of the lifting lever two (43) extends out of the lifting lever two (42) and is positioned in the fixing lever two (41), a push button (44) capable of transversely extending out of the lifting lever two (42) is arranged at the upper end of the lifting lever two (43), an elastic limiting piece (8) is connected to the lower end of the lifting lever two (43), a plurality of positioning holes (41 a) into which the elastic limiting piece (8) can be partially inserted are formed in the fixing lever two (41), all the positioning holes (41 a) are reversely distributed along the length of the fixing lever two (41), and when the push button (44) is pressed, the lifting lever two (43) swings around a connecting point to retract and the elastic limiting piece (8) moves out of the positioning holes (41 a).

9. A table, characterized in that it comprises a lifting structure according to any one of claims 1-8.

10. A chair comprising the lifting structure of any one of claims 1-8.