CN203952836U - A kind of desk and chair - Google Patents

Abstract

The utility model discloses a kind of desk and chair, belong to teaching facilities field.Desk and chair comprises desk and chair, and desk comprises desktop, desktop support, a pair of table foreleg, a pair of table back leg, head rod and the second connecting rod; First foreleg and first back leg are arranged in a crossed manner, and second foreleg and second back leg are arranged in a crossed manner, and a pair of table back leg is clipped between a pair of table foreleg; The first end of head rod is hinged on first back leg, and the second end of head rod is by the first securing member and first movable connection of foreleg; The first end of the second connecting rod is hinged on second back leg, and the second end of the second connecting rod is by the second securing member and second movable connection of foreleg; Between first foreleg and the other end of second foreleg, be provided with the first cross bar, chair is provided with for catching on the hook-like part of the first cross bar, and the bottom of chair is provided with contractile tourelle.The utility model can regulate the gradient of desktop.

Description

a desk and chair

technical field

The utility model relates to the field of teaching facilities, in particular to a desk and chair. the

Background technique

Desks and chairs are indispensable teaching facilities in the school teaching process. The desks and chairs currently used in schools are separate. According to the inclination of the desktop of the desk, the desk can be divided into three categories. The first category is the desk for ordinary learning, and the desktop is horizontal; the second category is the desk for mechanical drawing, and the angle between the desktop and the horizontal plane It is about 15°; the third category is a desk for art drawing, and the angle between the desktop and the horizontal plane is about 60°. the

In the process of realizing the utility model, the inventor finds that there are at least the following problems in the prior art:

First, the inclination of the desktop of the current desk is fixed, and the same desk will not be able to meet the needs of different teaching, and purchasing different desks will increase the cost of teaching facilities. Second, the desks and chairs are independent. Not only does the space occupy a large area, but also during use, the desks and chairs are often replaced due to cleaning and other reasons. As a result, the desks and chairs cannot be used as a set, which brings difficulties to teaching management. Inconvenience. The 3rd, when changing the position of desk and chair, the volume of desk and chair is bigger, is difficult for moving. the

Utility model content

In order to solve the problems of the prior art, the embodiment of the utility model provides a desk and chair. Described technical scheme is as follows:

The utility model provides a desk and chair. The desk and chair include a foldable desk and a foldable chair. The desk includes a desktop board, a desktop board bracket, and a For the front legs of the table and the rear legs of the table, the desktop board is arranged on the support of the desktop board, and the desk also includes a first connecting rod and a second connecting rod;

The pair of table front legs includes a first table front leg and a second table front leg, and the pair of table back legs includes a first table back leg and a second table back leg, and the first table front leg and the One end of the first back leg of the first table is respectively hinged on the first side of the tabletop bracket, and one end of the second front leg of the second table and the second back leg are respectively hinged on the side of the desktop board bracket and the first side of the tabletop bracket. On the second side opposite to one side, the front legs of the first table and the rear legs of the first table are crossed, the front legs of the second table are crossed with the rear legs of the second table, and the rear legs of the pair of tables are crossed. the legs are sandwiched between said pair of front legs;

The first end of the first connecting rod is hinged on the first rear leg of the table, and the second end of the first connecting rod is movably connected to the first front leg of the first table through a first fastener; The first end of the second connecting rod is hinged on the rear leg of the second table, and the second end of the second connecting rod is movably connected to the front leg of the second table through a second fastener;

The first connecting rod and the desktop board bracket are respectively located on both sides of the intersection position of the first table rear leg and the first table front leg, and the second connecting rod and the desktop board bracket are respectively located Both sides of the intersection position of the rear legs of the second table and the front legs of the second table;

A first crossbar is provided between the first front leg of the table and the other end of the second front leg, and the chair is provided with a hook for hooking the first crossbar, and the chair There is a retractable rolling device at the bottom. the

Optionally, the first fastener includes a wing nut, a bolt and a screw, the screw is fixed on the second end of the first connecting rod, and the wing nut is fixed to the bolt through a thread pair one end of the bolt, and the other end of the bolt passes through the first front leg and is threadedly connected with the screw. the

Optionally, a shaft is provided between the pair of back legs of the table, and the first end of the shaft passes through the first back leg of the table and is hinged to the first end of the first connecting rod. The second end passes through the second table rear leg and is hinged to the first end of the second connecting rod. the

Optionally, the desk further includes a bookshelf and a third connecting rod, the bookshelf is located between the desktop board support and the crossing position between the rear legs of the first table and the front legs of the first table,

The bookshelves are respectively hinged with the first front leg of the table and the second front leg of the table, the bookshelf is hinged with one end of the third connecting rod, and the other end of the third connecting rod is connected with the The support of the desktop board is hinged, and a second cross bar for supporting the bookshelf is arranged between the pair of rear legs of the table. the

Optionally, the first table rear leg and the second table rear leg respectively include an upper leg and a lower leg; one end of the upper leg is connected to the tabletop bracket; the lower leg One end of the upper leg is sleeved on the other end of the upper leg, and is telescopically connected with the upper leg through a third fastener;

The first connecting rod and the second connecting rod are respectively hinged to the upper legs, and a third cross bar is arranged between the lower legs. the

Optionally, said third fastener comprises a pin, a spring, and a first sleeve,

The first sleeve is fixed in the second end of the upper leg, the spring is arranged in the first sleeve, and one end of the spring is fixed on the inner wall of the first sleeve, so One end of the pin is fixedly connected with the other end of the spring and the pin is movably connected with the inner wall of the first sleeve, the first sleeve, the second end of the upper leg, and the lower One end of the leg is provided with a through hole matched with the other end of the pin. the

Optionally, the other ends of the first table front leg and the second table front leg are respectively provided with a second sleeve, and the second sleeve includes a cylinder and a sleeve provided on the cylinder , the sleeve is sleeved on the first cross bar. the

Optionally, the chair includes a chair panel, a chair panel bracket, a pair of chair front legs, a pair of chair rear legs, and a fourth connecting rod, and the pair of chair front legs includes a first chair front leg and a second chair front leg. front legs, the pair of back legs comprising a first back leg and a second back leg;

The chair panel is arranged on the chair panel bracket, and one end of the first chair rear leg and the second chair rear leg are respectively hinged on opposite side surfaces of the chair panel bracket, and the first chair front A fourth cross bar supporting the chair panel support is provided between the leg and the second chair front leg, the first chair front leg and the first chair rear leg are hinged crosswise, and the second chair front leg is cross-hinged together. The front legs of the chair are hinged crosswise with the second rear legs of the chair, the pair of front legs of the chair are clamped between the pair of rear legs of the chair, and one end of the fourth connecting rod is hinged on the first On the front leg of the chair, the other end of the fourth connecting rod is hinged on the chair panel bracket; the hinge position of the fourth connecting rod and the chair panel bracket is located between the first chair front leg and the second chair between the hind legs of a chair;

The first chair front leg and one end of the second chair front leg are fixedly connected by a fifth connecting rod, and the other ends of the first chair front leg and the second chair front leg are respectively provided with the As for the configuration member, the other ends of the first chair rear leg and the second chair rear leg are respectively provided with the rolling device. the

Optionally, a chair pillow is provided between the pair of front legs of the chair,

One end of the chair pillow is hinged to the first chair front leg, the other end of the chair pillow is hinged to the second chair front leg, and the chair pillow is located between the fifth connecting rod and the fourth transverse rod. between the poles. the

Optionally, the rolling device is a universal wheel. the

The beneficial effect brought by the technical solution provided by the embodiment of the utility model is: a four-bar mechanism is formed by the desktop board bracket, the front leg of the table, the rear leg of the table, the first connecting rod and the second connecting rod, and the first connecting rod and the second connecting rod The connecting rod is movably connected with a pair of front legs of the table through the first fastener and the second fastener respectively; The tightness of the connection between the front legs of the table can adjust the inclination of the desktop through the first fastener and the second fastener; the same desk can meet the needs of different teaching, saving the cost of teaching facilities; through the chair The configuration piece on the top hooks the first cross bar on the table, so that the table and chairs can be used as a set, which brings convenience to teaching management; at the same time, the first connecting rod and the second connecting rod can be adjusted through the first fastener and the second fastener. The tightness that connects between the two connecting rods and the front legs of the table can fold the desk, and hook the first cross bar on the desk by the configuration piece on the chair, and the folded desk can be combined with the desk front leg. The chairs are joined together to save space; the folded desk and chairs can be moved together by using the rolling device at the bottom of the chair, which can be easily moved. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts. the

Fig. 1 is the structural representation of the desk that the utility model embodiment provides;

Fig. 2-Fig. 4 is the three views of the desk that the utility model embodiment provides;

Fig. 5 is the structural representation of the first fastener that the utility model embodiment provides;

Fig. 6 is the structural representation of the 3rd fastener that the utility model embodiment provides;

Fig. 7 is the structural representation of the chair that the utility model embodiment provides;

Fig. 8 is the front view of the chair that the utility model embodiment provides;

Fig. 9 is the right view of the chair shown in Fig. 8;

Figure 10 is a schematic diagram of the use of a desk and chair provided by the embodiment of the present invention;

11-13 are schematic diagrams of another use situation of a desk and chair provided by the embodiment of the present invention. the

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings. the

Example

The embodiment of the utility model provides a desk and chair, referring to FIG. 10 , the desk and chair includes a foldable desk, 10 and a foldable chair 20 . the

Referring to Fig. 1-Fig. 4, this desk 10 comprises: desktop board 11, table board support 12, a pair of table front legs and a pair of table rear legs that are connected on the table board support 12. The desktop board 11 is arranged on the desktop board support 12 . the

The desk 10 also includes a first connecting rod 16 and a second connecting rod 17 . A pair of table front legs includes a first table front leg 13a and a second table front leg 13b, and a pair of table back legs includes a first table back leg 14a and a second table back leg 14b. the

One end of the first table front leg 13a and the first table rear leg 14a is respectively hinged on the first side of the table top support 12, and one end of the second table front leg 13b and the second table rear leg 14b is respectively hinged on the top of the table top support 12. A second side opposite to the first side. the

The first table front legs 13a and the first table rear legs 14a are intersected, the second table front legs 13b and the second table rear legs 14b are intersected, and a pair of table rear legs are sandwiched between the pair of table front legs. the

The first end of the first connecting rod 16 is hinged on the first table rear leg 14a, and the second end of the first connecting rod 16 is movably connected with the first table front leg 13a by the first fastener 16a; the second connecting rod The first end of 17 is hinged on the second table rear leg 14b, and the second end of the second connecting rod 17 is movably connected with the second table front leg 13b through the second fastener 17a. the

The first connecting rod 16 and the desktop board support 12 are respectively positioned at the two sides of the intersecting position of the first table rear leg 14a and the first table front leg 13a, and the second connecting rod 17 and the desktop board bracket 12 are respectively positioned at the second table rear leg 14b The two sides of the intersection position with the second table front leg 13b. the

A first cross bar 18 is set between the other end of the first table front leg 13a and the second table front leg 13b, the chair is provided with a hook 28 for hooking the first cross bar 18, and the bottom of the chair is provided with Retractable rolling device 210 . the

Optionally, referring to FIG. 5, the first fastener 16a includes a wing nut 16b, a bolt 16c and a screw 16d, the screw 16d is fixed on the second end of the first connecting rod 16, and the wing nut 16b is fixed by a thread pair At one end of the bolt 16c, the other end of the bolt 16c passes through the first front leg 13a and is threadedly connected with the screw 16d. the

Wherein, the structure of the first fastener 16a is the same as that of the second fastener 17a. the

The above-mentioned desktop board support 12, a pair of front legs of the table, a pair of rear legs of the table, the first connecting rod 16, and the second connecting rod 17 constitute a four-bar mechanism that can adjust the angle. When it is necessary to adjust the inclination of the desktop, first loosen the wing nuts of the first fastener 16a and the second fastener 17a; ), so that the desktop board 11 is tilted; finally, when the desktop board 11 is tilted to a suitable angle, the wing nut is locked. In this way, the angle conversion of the four-bar mechanism is realized. At the same time, the folding of the desk can also be realized through the four-bar mechanism. When folding the desk, first loosen the wing nuts of the first fastener 16a and the second fastener 17a, and then apply an external force to make the two pairs of table legs gather together. the

Optionally, a shaft 15 is provided between a pair of table rear legs. The first end of axle 15 passes through the first end of first table rear leg 14a and first connecting rod 16 and is hinged, and the second end of axle 15 passes the first end of second table rear leg 14b and second connecting rod 17 hinged. the

Optionally, the desk 10 further includes: a bookshelf 19 and a third connecting rod 110 . The bookshelf 19 is located between the desktop support 12 and the intersection of the first desk rear leg 14a and the first desk front leg 13a. the

The bookshelf 19 is respectively hinged with the first front leg 13a and the second front leg 13b. The bookshelf 19 is hinged to one end of the third connecting rod 110 , and the other end of the third connecting rod 110 is hinged to the desktop board support 12 . A second cross bar 111 for supporting the bookshelf 19 is arranged between the pair of back legs of the table. the

Optionally, the third connecting rod 110 is a telescopic rod, and the length of the third connecting rod 110 can be adjusted as required. When the desk is folded, by adjusting the length of the third connecting rod 110 , the bookshelf 19 can be attached to the desktop bracket 12 . the

Optionally, the first table rear leg 14a and the second table rear leg 14b include an upper leg 112a and a lower leg 112b respectively; one end of the upper leg 112a is connected to the desktop support 12; It is located at the other end of the upper leg 112a, and is telescopically connected with the upper leg 112a through a third fastener; the first connecting rod 16 and the second connecting rod 17 are respectively hinged with the upper leg 112a, and the lower leg 112b A third crossbar 113 is provided between them. the

Wherein, referring to FIG. 6 , the third fastener includes a pin 114a, a spring 114b, and a first sleeve 114c. The first sleeve 114c is secured within the second end of the upper leg 112a. The spring 114b is disposed in the first sleeve 114c, and one end of the spring 114b is fixed on the inner wall of the first sleeve 114c. One end of the pin 114a is fixedly connected to the other end of the spring 114b and the pin 114a is movably connected to the inner wall of the first sleeve 114c. The first sleeve 114c, the second end of the upper leg 112a, and one end of the lower leg 112b are provided with a through hole matched with the other end of the pin 114a. the

The structure of the fourth fastener is the same as that of the third fastener. the

The upper leg 112a and the lower leg 112b are connected by a pin 114a. The lower leg 112b is able to slide over the upper leg 112a when the push pin 114a compresses the spring 114b and when the pin 114a is fully pressed into the first sleeve 114c. Through the third fastener and the fourth fastener, the length of the rear legs of the table can be adjusted, which makes the length of the rear legs of the desk can be adjusted correspondingly according to the slope when adjusting the inclination of the desk top board. Simultaneously, after the desk is folded, the length of the back legs of the desk can be adjusted to the shortest length, which reduces the area of the desk and makes it easier to move the desk; When moving the desk 10 and the chair 20, the lower legs 112b are facing the ground. If the length of the lower legs 112b is relatively long, then when dragging, the lower legs 112b may be stuck on the ground, resulting in failure to drag. When the length of the table is contracted, the third crossbar 113 moves toward the upper leg 112a with the lower leg 112b, and the length of the back leg of the table can be as close as possible to the length of the front leg of the table, so that the lower leg 112b will not be stuck on the ground. Relatively easy to drag. the

Wherein, the other end of the first table front leg 13a and the second table front leg 13b is provided with the second sleeve 115, and the second sleeve 115 comprises a cylindrical body and a sleeve sleeve arranged on the cylindrical body, and the cylindrical body is fixed on the first On the table front leg 13a and the second table front leg 13b, the sleeve is sleeved on the first cross bar 18 . the

Optionally, the shape of the desktop board 11 can be square. the

Referring to FIGS. 7-9 , the chair 20 includes: a chair panel 21 , a chair panel bracket 22 , a pair of chair front legs, a pair of chair rear legs, and a fourth connecting rod 25 . The pair of front legs includes a first front leg 23a and a second front leg 23b, and the pair of rear legs includes a first rear leg 24a and a second rear leg 24b. the

Chair panel 21 is located on the chair panel support 22, and one end of the first chair rear leg 24a and the second chair rear leg 24b are respectively hinged on the opposite side surfaces of the chair panel support 22, the first chair front leg 23a and the second chair front leg A fourth cross bar 27 supporting the chair panel frame 22 is provided between the legs 23b. the

The first chair front leg 23a is hinged together with the first chair rear leg 24a, the second chair front leg 23b is hinged with the second chair rear leg 24b, and a pair of chair front legs is sandwiched between a pair of chair rear legs. between. the

One end of the fourth connecting rod 25 is hinged on the first chair front leg 23a, and the other end of the fourth connecting rod 25 is hinged on the chair panel support 22; Between the front leg 23a and the first chair rear leg 24a. the

One end of the first chair front leg 23a and the second chair front leg 23b is fixedly connected by the fifth connecting rod 26, and the other ends of the first chair front leg 23a and the second chair front leg 23b are respectively provided with a configuration member 28, The other ends of the first chair rear leg 24a and the second chair rear leg 24b are respectively provided with rolling devices 210 . the

Optionally, the rolling device 210 may be a universal wheel. With universal wheels, chairs and desks can be moved easily after they are folded. the

The chair panel support 22, a pair of chair front legs, a pair of chair rear legs and the fourth connecting rod 25 constitute a four-bar mechanism. When the folding chair needs to be adjusted, an external force is applied so that the front legs of the chair and the rear legs of the chair are gathered together. the

Optionally, a chair pillow 29 is provided between the pair of front legs, one end of the chair pillow 29 is hinged to the first chair front leg 23a, and the other end of the chair pillow 29 is hinged to the second chair front leg 23b. The seat pillow 29 is located between the fifth connecting rod 26 and the fourth cross rod 27 . The chair pillow 29 can rotate freely to bring comfort to the user. the

Below in conjunction with Fig. 10-Fig. 13, briefly introduce the situation when the desk 10 and the chair 20 provided by the above-mentioned embodiment are used together. Referring to FIG. 10 , through the first crossbar 18 on the desk 10 and the hook 28 on the chair 20 , the desk 10 and the chair 20 can be connected as one, so that the desk 10 and the chair 20 can be used as a set. Simultaneously, referring to Fig. 11-Fig. 13, when moving desk 10 and chair 20, desk 10 and chair 20 can be folded earlier, then after folding, pass first cross bar 18 on desk 10 and chair 20 The hook 28 on the top carries the desk 10 on the chair 20, and when people pull the chair, the desk 10 will walk together with the rolling device 210 of the chair 20, just like pulling a suitcase. This greatly facilitates the teaching outside the classroom, and enables students to learn outdoors conveniently and quickly, such as playground teaching, outdoor sketching, and drawing. the

In the embodiment of the utility model, a four-bar mechanism is formed by the desktop board support, the front legs of the table, the rear legs of the table, the first connecting rod and the second connecting rod, and the first connecting rod and the second connecting rod are respectively passed through the first fastener and the second connecting rod. The two fasteners are movably connected to a pair of front legs of the table; the first and second fasteners are used to adjust the tightness of the connection between the first connecting rod and the second connecting rod and the front legs of the table, so that The inclination of the desktop is adjusted through the first fastener and the second fastener; the same desk can meet the needs of different teaching, saving the cost of teaching facilities; The cross bar enables the table and chairs to be used as a set, which brings convenience to teaching management; at the same time, the connection between the first connecting rod and the second connecting rod and the front legs of the table is adjusted through the first fastener and the second fastener The tightness of the desk can be folded, and the folded desk can be connected with the chair by hooking the first crossbar on the desk through the configuration member on the chair, which saves space; The set rolling device moves the folded desk and chair together, which can be easily moved. the

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models. the

Claims (10)

1. a kind of desk and chair, described desk and chair comprises foldable desk and foldable chair, and described desk comprises desktop board (11), desktop board support (12), is connected on described desktop board support (12) a pair of table front legs and a pair of table rear legs, the desktop board (11) is located on the desktop board support (12), it is characterized in that the desk also includes a first connecting rod (16) and the second connecting rod (17); The pair of table front legs includes a first table front leg (13a) and a second table front leg (13b), and the pair of table back legs includes a first table back leg (14a) and a second table back leg (14b) ), one end of the first table front leg (13a) and the first table rear leg (14a) is respectively hinged on the first side of the tabletop bracket (12), and the second table front leg (13b ) and one end of the second table rear leg (14b) are respectively hinged on the second side opposite to the first side of the desktop board support (12), the first table front leg (13a) and the The first table rear legs (14a) are arranged crosswise, the second table front legs (13b) and the second table rear legs (14b) are arranged crosswise, and the pair of table rear legs are sandwiched between the pair of table between the front legs; The first end of the first connecting rod (16) is hinged on the first table rear leg (14a), and the second end of the first connecting rod (16) is connected with the first fastener (16a) The first table front leg (13a) is movably connected; the first end of the second connecting rod (17) is hinged on the second table rear leg (14b), and the second connecting rod (17) The second end of the second fastener (17a) is movably connected with the second table front leg (13b); The first connecting rod (16) and the tabletop bracket (12) are respectively located on both sides of the crossing position of the first table rear leg (14a) and the first table front leg (13a), the The second connecting rod (17) and the desktop board bracket (12) are respectively located on both sides of the intersection position of the second table rear leg (14b) and the second table front leg (13b); A first crossbar (18) is arranged between the other end of the first table front leg (13a) and the second table front leg (13b), and the chair is provided with a hook for hooking the first crossbar. (18), and the bottom of the chair is provided with a retractable rolling device (210). the 2. desks and chairs according to claim 1, is characterized in that, described first fastener (16a) comprises wing nut (16b), bolt (16c) and screw (16d), and described screw (16d) ) is fixed on the second end of the first connecting rod (16), the wing nut (16b) is fixed on one end of the bolt (16c) through a thread pair, and the other end of the bolt (16c) passes through The first table front leg (13a) is threadedly connected with the screw (16d). the 3. desks and chairs according to claim 1, is characterized in that, axle (15) is arranged between described a pair of table rear legs, and the first end of described axle (15) passes through described first table The rear leg (14a) is hinged with the first end of the first connecting rod (16), and the second end of the shaft (15) passes through the second table rear leg (14b) and the second connecting rod The first end of (17) is hinged. the 4. desks and chairs according to claim 1, is characterized in that, described desk also comprises put bookshelf (19) and the 3rd connecting rod (110), and described puts bookshelf (19) is positioned at described desktop board support (12) and the intersecting position of the first table rear leg (14a) and the first table front leg (13a), The bookshelves (19) are respectively hinged with the first table front legs (13a) and the second table front legs (13b), and the bookshelves (19) and the third connecting rods (110) are hinged. One end is hinged, the other end of the third connecting rod (110) is hinged to the desktop board bracket (12), and a second horizontal rail for supporting the bookshelf (19) is provided between the pair of table rear legs. Rod (111). the 5. The desk and chair according to claim 1, characterized in that, said first table rear legs (14a) and said second table rear legs (14b) respectively comprise upper legs (112a) and lower legs (112b); one end of the upper leg (112a) is connected to the desktop support (12); one end of the lower leg (112b) is sleeved on the other end of the upper leg (112a) , and is telescopically connected to the upper leg (112a) through a third fastener; The first connecting rod (16) and the second connecting rod (17) are respectively hinged to the upper legs (112a), and a third cross bar (113) is arranged between the lower legs (112b) . the 6. desks and chairs according to claim 5, is characterized in that, described 3rd fastener comprises pin (114a), spring (114b) and first sleeve (114c), The first sleeve (114c) is fixed in the second end of the upper leg (112a), the spring (114b) is arranged in the first sleeve (114c), and the spring (114b ) is fixed on the inner wall of the first sleeve (114c), one end of the pin (114a) is fixedly connected to the other end of the spring (114b), and the pin (114a) is connected to the first sleeve The inner wall of the barrel (114c) is movably connected, the first sleeve (114c), the second end of the upper leg (112a), and one end of the lower leg (112b) are provided with the pin ( The other end of 114a) matches the through hole. the 7. The desk and chair according to claim 1, characterized in that, the other ends of the first table front leg (13a) and the second table front leg (13b) are respectively provided with a second sleeve (115 ), the second sleeve (115) includes a cylinder and a sleeve provided on the cylinder, and the sleeve is sleeved on the first crossbar (18). the 8. desks and chairs according to claim 1, is characterized in that, described chair comprises chair panel (21), chair panel support (22), a pair of chair front legs, a pair of chair rear legs and the 4th connection Rod (25), the pair of front legs includes a first front leg (23a) and a second front leg (23b), and the pair of rear legs includes a first rear leg (24a) and a second Chair rear legs (24b); The chair panel (21) is arranged on the chair panel bracket (22), and one end of the first chair rear leg (24a) and the second chair rear leg (24b) are respectively hinged on the chair panel bracket (22) On opposite sides, a fourth cross bar (27) supporting the chair panel support (22) is provided between the first chair front leg (23a) and the second chair front leg (23b). ), the first chair front leg (23a) and the first chair rear leg (24a) are cross-hinged together, the second chair front leg (23b) and the second chair rear leg (24b) Hinged together crosswise, the pair of chair front legs are sandwiched between the pair of chair rear legs, and one end of the fourth connecting rod (25) is hinged on the first chair front leg (23a), The other end of the fourth connecting rod (25) is hinged on the chair panel bracket (22); the hinged position of the fourth connecting rod (25) and the chair panel bracket (22) is located at the first Between the chair front leg (23a) and the first chair rear leg (24a); One end of the first chair front leg (23a) and the second chair front leg (23b) is fixedly connected by a fifth connecting rod (26), and the first chair front leg (23a) and the second chair front leg (23a) The other ends of the two front legs (23b) are respectively provided with the hooks (28), and the other ends of the first rear legs (24a) and the second rear legs (24b) are respectively provided with the hooks. The rolling device (210) described above. the 9. desks and chairs according to claim 8, is characterized in that, chair pillow (29) is provided between the described pair of chair front legs, One end of the chair pillow (29) is hinged to the first chair front leg (23a), the other end of the chair pillow (29) is hinged to the second chair front leg (23b), and the chair pillow ( 29) Located between the fifth connecting rod (26) and the fourth cross rod (27). the 10. The desk and chair according to claim 9, characterized in that, the rolling device (210) is a universal wheel. the