CN210988885U

CN210988885U - Easel desk with drawing board fixing device

Info

Publication number: CN210988885U
Application number: CN201921526274.9U
Authority: CN
Inventors: 于旋
Original assignee: Tangshan Jiuge Shuju Metal Products Co ltd
Current assignee: Tangshan Jiuge Shuju Metal Products Co ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2020-07-14
Anticipated expiration: 2029-09-12

Abstract

The utility model relates to an easel desk with drawing board fixing device belongs to the technical field of desk, and it includes the table and leaves the drawing board on the table in, is fixed with fastening screw on the table lateral wall, still is connected with the fixed plate between table and fastening screw, sets up the first spacing groove with the mutual chucking of fastening screw on the fixed plate, fixed plate upper end protrusion in table surface during the chucking. The utility model discloses have the effect of fixing on the desk that the drawing board is stable.

Description

Easel desk with drawing board fixing device

Technical Field

The utility model belongs to the technical field of the technique of desk and specifically relates to an easel desk with drawing board fixing device is related to.

Background

In fine arts teaching and planar design process, often use this kind of instrument of easel, in the use, can place the drawing board of drawing usefulness on the table usually, when need not drawing, can take off the drawing board again.

The utility model discloses a have now that publication number is CN 205125485U's chinese utility model patent, it discloses a portable easel, including the cross arm, cross arm top both sides are equipped with the dead lever, are equipped with the recess on the dead lever, be equipped with the swing joint seat on two preceding angles in cross arm top, swing joint seat lower part fixed connection, upper portion swing joint bracket, the bracket both sides are equipped with sliding connection seat, are equipped with set screw on the sliding connection seat, connect the table through sliding connection seat above the bracket, be equipped with the bracing piece below the bracket, the bracing piece upper end is connected on the bracket, and the lower extreme is installed in the recess above the dead lever. In the using process, the drawing board may move on the table board, so that the drawing effect is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an easel desk with drawing board fixing device, it has the stable effect of fixing on the desk of drawing board.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: the utility model provides an easel desk with drawing board fixing device, includes the table and leaves the drawing board on the table in, is fixed with fastening screw on the table lateral wall, still is connected with the fixed plate between table and fastening screw, sets up the first spacing groove with the mutual chucking of fastening screw on the fixed plate, fixed plate upper end protrusion in table surface during the chucking.

Through adopting above-mentioned technical scheme, remove the fixed plate, make fastening screw chucking in first spacing groove, the border of fixed plate can be higher than the border of table at this moment to can be with stable the placing on the table of drawing board.

The utility model discloses further set up to: and a second limiting groove clamped with the fastening screw is further formed in the fixing plate, the length of the second limiting groove is larger than that of the first limiting groove, and a connecting groove for allowing the fastening screw to slide is communicated between the first limiting groove and the second limiting groove.

Through adopting above-mentioned technical scheme, remove the fixed plate, with fastening screw chucking in the second spacing groove, at this moment the border of fixed plate is in the coplanar with the border of table, avoids when using the table, thereby the fixed plate can be higher than the desktop and take place the contact with people's arm, influences people's use.

The utility model discloses further set up to: the table is characterized in that a support frame is arranged below the table, the table is hinged to the support frame through a table connecting shaft, and an angle adjusting device used for adjusting the angle of the table is further connected between the support frame and the table.

Through adopting above-mentioned technical scheme, when lifting the table, the table can rotate under angle adjusting device's effect to obtain required angular position.

The utility model discloses further set up to: the angle adjusting device comprises an upper support rod hinged to the table plate and a lower support rod hinged to the support frame, the upper support rod is hinged to the lower support rod through a hinged shaft, and a supporting assembly is further connected between the upper support rod and the lower support rod.

By adopting the technical scheme, after the table plate is lifted, the angle between the upper support rod and the lower support rod can be changed, and the angle between the upper support rod and the lower support rod can be determined through the support component, so that the inclination angle of the table plate can be determined.

The utility model discloses further set up to: a first groove is formed in the lower supporting rod, when the table is placed normally, the upper supporting rod and the lower supporting rod are in a closed state, and the upper supporting rod is located in the first groove.

Through adopting above-mentioned technical scheme, when the table was put peacefully, the second recess that the vaulting pole just was located down to the last vaulting pole.

The utility model discloses further set up to: the supporting component comprises a fixed shaft connected in the first groove, a connecting rod is hinged to the fixed shaft, a second groove is formed in the upper supporting rod, the inner diameter of the second groove is larger than the opening of the second groove, two rows of clamping grooves are formed in the opening ends of the two side walls of the second groove, a sliding block which can slide in the second groove in a hinged mode is further arranged in the second groove, and a pair of limiting columns which are connected with the clamping grooves in a clamped mode are arranged on the portion, exposed out of the second groove, of the sliding block.

Through adopting above-mentioned technical scheme, when lifting table angle of adjustment, the sliding block can be because the action of gravity of self slides down along the second recess, when the position of draw-in groove was slided to spacing post on the sliding block, loosens the table in the hand, and the table can drive the vaulting pole and have a effect that compresses tightly downwards to make spacing post joint in the draw-in groove.

The utility model discloses further set up to: the connecting rod is provided with hanging rings, the hinged shaft is also provided with hanging rings, and an extension spring for pulling the connecting rod is connected between the two hanging rings.

Through adopting above-mentioned technical scheme, when the sliding block slides down along the second recess because extension spring connects on the rings of connecting rod, so extension spring's pulling force can have a trend towards draw-in groove direction motion at sliding block gliding in-process pulling connecting rod, thereby drive the spacing post card of sliding block in nearest draw-in groove, when needs angle regulation once more, continue upwards to lift the table, go up the contained angle grow between vaulting pole and the lower vaulting pole, contained angle between connecting rod and the lower vaulting pole diminishes, when spacing post breaks away from last draw-in groove, the extension spring pulling force disappears, put down the table this moment, spacing post can be along the lateral wall of second recess upwards sliding always, thereby put the table flat on the support frame.

The utility model discloses further set up to: and the fixed plate is connected with a pressing plate for pressing the drawing board.

Through adopting above-mentioned technical scheme, when the drawing board was placed on the fixed plate, the pressure strip can compress tightly the drawing board in the middle of table and pressure strip to the realization is fixed the drawing board on the table.

The utility model discloses further set up to: a fixing groove for storing the pressing plate is formed in the table plate.

Through adopting above-mentioned technical scheme, when need not place the drawing board on the table, remove the fixed plate, make fastening screw chucking in the second spacing groove, at this moment the pressure strip can be located the fixed slot to can not influence people's use.

To sum up, the utility model discloses a beneficial technological effect does:

1. when the drawing board is placed to needs on the table, through not hard up fastening screw a little, make the fixed plate can take place to remove, can block when first spacing groove when fastening screw, at this moment, it is fixed to screw up fastening screw to the fixed plate realization, first spacing groove is spacing to the fixed plate through fastening screw, thereby realize placing the fixed plate is stable on the table, at this moment, the higher boundary of fixed plate can be higher than the higher boundary of table, thereby the fixed plate can play the effect of support to the drawing board, prevent that the drawing board from droing from the table.

2. Through having seted up the fixed slot on the table, can make the pressure strip be located the fixed slot when pressure strip contacts with the table, prevent to put the table flat when using, convex pressure strip influences normal use.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment when a drawing board is placed.

Fig. 2 is a schematic structural diagram of the embodiment when no drawing board is placed.

Fig. 3 is a schematic structural diagram of a fixing plate according to the first embodiment.

Fig. 4 is a schematic structural diagram of an angle adjustment device according to an embodiment.

FIG. 5 is a schematic view of the angle adjusting device according to the first embodiment when it is opened.

Fig. 6 is a partially enlarged schematic view of a portion a in fig. 5.

Fig. 7 is a schematic structural view of the angle adjusting device when closed according to the first embodiment.

Fig. 8 is a schematic structural view of the angle adjusting device according to the first embodiment between the upper stay and the lower stay when the angle adjusting device is closed.

Fig. 9 is a schematic structural view of a fixing plate and a pressing plate in the second embodiment.

Fig. 10 is a schematic structural view showing a fixing groove on the table board according to the second embodiment.

Fig. 11 is a schematic structural diagram of the second embodiment when a drawing board is placed.

Fig. 12 is a schematic structural diagram of the second embodiment when no drawing board is placed.

In the figure, 1, a table plate; 101. a drawing board; 2. a support frame; 201. a longitudinal support bar; 3. a table board connecting shaft; 4. a fixing device; 401. a fixing plate; 402. fastening screws; 403. a first limit groove; 404. a second limit groove; 405. connecting grooves; 406. fixing grooves; 407. a compression plate; 5. an angle adjusting device; 501. an upper stay bar; 502. a lower stay bar; 503. a fixed block; 504. hinging a shaft; 505. a first groove; 506. a second groove; 510. a support assembly; 511. a fixed shaft; 512. a connecting rod; 513. a slider; 514. a hoisting ring; 515. a card slot; 516. a limiting column; 517. an extension spring; 6. a connecting member; 601. a connecting portion; 602. a rotating part.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows: referring to fig. 1 and 2, for the utility model discloses an easel desk with drawing board fixing device, including support frame 2, the one end of keeping away from ground on support frame 2 is equipped with table connecting axle 3, is connected with table 1 through a pair of connecting piece 6 on table connecting axle 3. The connecting member 6 includes a connecting portion 601 and a rotating portion 602 (refer to fig. 4), the connecting portion 601 is fixedly connected to the lower surface of the table 1 near the boundary by screws, the rotating portion 602 is in a circular ring structure, the rotating portion 602 is sleeved outside the table connecting shaft 3, and the rotating portion 602 and the table connecting shaft 3 can rotate with each other. When the angle of the table board 1 needs to be adjusted, the table board 1 can rotate by taking the table board connecting shaft 3 as a center by lifting one end of the table board 1 opposite to the connecting piece 6. In order to fix the table board 1 at a desired angle, a pair of angle adjusting devices 5 are further hinged between the table board 1 and the supporting frame 2. After the table board 1 is angularly adjusted by the angle adjusting device 5, the drawing board 101 on the table board 1 may slide, and in order to avoid the sliding of the drawing board 101, a fixing device 4 is disposed on a side wall of the table board 1 adjacent to the table board connecting shaft 3.

The fixing device 4 includes a fixing plate 401, the fixing plate 401 is connected to a side wall of the table 1 adjacent to the table connecting shaft 3 through a fastening screw 402, as shown in fig. 3, a first limiting groove 403 for fixing the fixing plate 401 on the table 1 is formed in the fixing plate 401, a second limiting groove 404 for fixing the fixing plate 401 at different positions is formed in one side of the first limiting groove 403, the second limiting groove 404 is longer than the first limiting groove 403, a connecting groove 405 is formed in bottom ends of the first limiting groove 403 and the second limiting groove 404, and the first limiting groove 403 and the second limiting groove 404 are communicated together through the connecting groove 405.

As shown in fig. 3, when the drawing board 101 needs to be placed on the table board 1, the fixing plate 401 can move by slightly loosening the fastening screw 402, so that the connecting groove 405 can slide on the fastening screw 402, when the fastening screw 402 enters the first limiting groove 403, the fastening screw 402 can be clamped on the first limiting groove 403, at this time, the fastening screw 402 is tightened to fix the fixing plate 401, the first limiting groove 403 limits the fixing plate 401 through the fastening screw 402, so that the fixing plate 401 is stably placed on the table board 1, at this time, the upper boundary of the fixing plate 401 is higher than the upper boundary of the table board 1 (refer to fig. 1), so that the fixing plate 401 can support the drawing board 101, and the drawing board 101 is prevented from falling off from the table board 1.

When the drawing board 101 does not need to be placed on the table board 1, the fixing plate 401 is moved by loosening the fastening screw 402, the fastening screw 402 is separated from the position of the first limiting groove 403, then the fixing plate 401 is moved, the fastening screw 402 enters the second limiting groove 404, the fixing plate 401 is pressed downwards to be clamped in the second limiting groove 404, the fastening screw 402 can be clamped on the second limiting groove 404, the fastening screw 402 is screwed to prevent the fixing plate 401 from moving, at the moment, the upper boundary of the fixing plate 401 and the upper boundary of the table board 1 can be located on the same plane (refer to fig. 2), and the situation that when the table board 1 is used, the fixing plate 401 is higher than the table top and is in contact with the arms of people to influence the use of people is avoided.

As shown in fig. 4, the angle adjusting means 5 includes an upper stay 501 and a lower stay 502, and the upper stay 501 and the lower stay 502 are hinged by a hinge shaft 504 (refer to fig. 5). A pair of fixed blocks 503 is fixed on one end of the table board 1 far away from the table board connecting shaft 3, and the upper stay bar 501 is hinged with the fixed blocks 503 so as to be connected to the table board 1. A pair of longitudinal support rods 201 which are perpendicular to the table board connecting shaft 3 and are mutually connected with two ends of the table board connecting shaft 3 are arranged on the support frame 2, and the lower support rod 502 is hinged to one end, far away from the table board connecting shaft 3, of the inner side surface of the longitudinal support rod 201 through a hinge shaft 504.

As shown in fig. 5, a supporting component 510 for supporting an angle between the upper brace 501 and the lower brace 502 is connected between the upper brace 501 and the lower brace 502, a first groove 505 is further formed on the lower brace 502, an inner diameter of the first groove 505 is consistent with a size of the opening, the upper brace 501 and the lower brace 502 are combined together when the table board 1 is placed, and at this time, the upper brace 501 is located in the first groove 505 on the lower brace 502 (refer to fig. 7). The upper brace 501 is provided with a second groove 506, and the opening size of the second groove 506 is smaller than the inner diameter of the second groove 506.

As shown in fig. 6, the support assembly 510 includes a fixed shaft 511 fixed in the first groove 505, a connecting rod 512 hinged on the fixed shaft 511, and a sliding block 513 slidable in the second groove 506 hinged on the other end of the connecting rod 512, wherein the cross-sectional shape of the sliding block 513 is identical to the cross-sectional shape of the second groove 506, and because the opening of the second groove 506 is smaller than the inner diameter, the sliding block 513 can only be inserted into the second groove 506 from both ends of the second groove 506 and can not be separated from the radial direction of the second groove 506. Since the hinge shafts 504 are provided at both ends of the second groove 506 during the sliding, the sliding block 513 does not slide out of the second groove 506 from the axial direction of the second groove 506.

One end of the connecting rod 512, which is close to the fixed shaft 511, is welded with a hanging ring 514, the hinge shaft 504 is also welded with a hanging ring 514, an extension spring 517 is connected between the two hanging rings 514, two rows of clamping grooves 515 are formed in the opening ends of the two side walls of the second groove 506, a pair of limiting columns 516 which are mutually clamped with the clamping grooves 515 are arranged on the part of the sliding block 513, which is exposed out of the second groove 506, and the limiting columns 516 and the sliding block 513 are integrally formed. When the table board 1 is laid flat, the upper brace 501 and the lower brace 502 are closed by the hinge shaft 504, and then the connecting rod 512 is located in the first groove 505 of the lower brace 502 together with the upper brace 501, and the connecting rod 512 is located at the other side of the extension spring 517 (refer to fig. 8) connected to the fixed shaft 511, and at this time, the distance between the two hanging rings 514 is maximized, so that the tensile force of the extension spring 517 is maximized. When the table board 1 is lifted to adjust the angle, the included angle between the upper support rod 501 and the lower support rod 502 is increased, because one end of the connecting rod 512 is hinged to the fixing shaft 511, and the fixing shaft 511 is fixed in the lower support rod 502, one end of the connecting rod 512 can only rotate with the fixing shaft 511, the other end of the connecting rod 512 can drive the sliding block 513 to slide downwards along the second groove 506, and meanwhile, due to the action of the extension spring 517, the connecting rod 512 can be pulled to drive the limiting column 516 of the sliding block 513 to be clamped in the nearest clamping groove 515 in the sliding process of the sliding block 513, the table board 1 in the hand is released, the table board 1 can drive the upper support rod 501 to have a downward pressing effect, so that the limiting column 516 is more firmly clamped in the clamping groove 515, the angle between the upper support rod 501 and the lower support rod 502 cannot be changed, and the table board 1 is fixed at a required.

When the table board 1 needs to be placed flat, the table board 1 is lifted upwards at first, so that the limiting column 516 on the sliding block 513 slides out of the last clamping groove 515, at this time, the distance between the two hanging rings 514 is shortest, the extension spring 517 cannot generate tensile force, then the table board 1 is quickly placed down, the limiting column 516 on the sliding block 513 slides upwards along the side wall between every two clamping grooves 515 until the limiting column 516 slides to the position without the clamping grooves 515, the table board 1 can be placed flat on the support frame 2, and at this time, the upper support rod 501 drives the connecting rod 512 to be located in the first groove 505 of the lower support rod 502 (refer to fig. 7).

The implementation principle of the embodiment is as follows: when need place drawing board 101 on table 1, through loosening fastening screw 402 a little, make fixed plate 401 can take place to remove, when fastening screw 402 can block on first spacing groove 403, at this moment, it realizes fixing to fixed plate 401 to screw up fastening screw 402, first spacing groove 403 is spacing to fixed plate 401 through fastening screw 402, thereby realize placing fixed plate 401 stably on table 1, at this moment, the upper boundary of fixed plate 401 can be higher than the upper boundary of table 1, thereby fixed plate 401 can play the effect of support to drawing board 101, prevent that drawing board 101 from droing from table 1.

When drawing board 101 need not be placed on table 1, not hard up fastening screw 402 makes fixed plate 401 take place to remove, makes fastening screw 402 joint in second spacing groove 404, then screws up fastening screw 402 and makes fixed plate 401 can not remove, and at this moment the last border of fixed plate 401 and the last border of table 1 can be on the coplanar, avoid when using table 1, thereby fixed plate 401 can be higher than the desktop and take place the contact with people's arm, influence people's use.

When the drawing board 101 is not needed, the table board 1 needs to be placed flat, the drawing board 101 is taken away firstly, the table board 1 is placed flat through the angle adjusting device 5, then the fixing plate 401 is pushed upwards, the fastening screw 402 is separated from the first limiting groove 403, then the fixing plate 401 is moved, the fastening screw 402 is located below the second limiting groove 404, the fastening screw 402 is clamped in the second limiting groove 404 through pressing the fixing plate 401 downwards, at the moment, the upper boundary of the fixing plate 401 and the upper boundary of the table board 1 are located on the same plane, and therefore the use of people cannot be influenced.

Example two: as shown in fig. 9 and 10, the easel desk with the drawing board fixing device is different from the first embodiment in that a pressing plate 407 perpendicular to a fixing plate 401 is connected to the fixing plate 401, the fixing plate 401 and the pressing plate 407 are of a right-angle structure integrally formed, a fixing groove 406 is formed in the desk board 1, the size of the fixing groove 406 is the same as that of the pressing plate 407, and the depth of the fixing groove 406 is the same as that of the pressing plate 407.

As shown in fig. 11, when the drawing board 101 needs to be placed on the table board 1, the fixing plate 401 is moved by loosening the fastening screw 402, so that the connecting groove 405 slides on the fastening screw 402, when the fastening screw 402 enters the first limiting groove 403, the fastening screw 402 can be clamped on the first limiting groove 403, at this time, the fastening screw 402 is tightened to fix the fixing plate 401, the first limiting groove 403 limits the fixing plate 401 through the fastening screw 402, so that the fixing plate 401 is stably fixed on the table board 1, at this time, the upper boundary of the fixing plate 401 is higher than the upper boundary of the table board 1, so that a groove is formed between the pressing plate 407 and the table board 1, and the drawing board 101 is fixed on the table board 1 by placing the drawing board 101 in the groove.

As shown in fig. 12, when the drawing board 101 does not need to be placed on the table board 1, the fixing plate 401 is pushed by loosening the fastening screw 402, the fastening screw 402 is separated from the position of the first limiting groove 403, then the fixing plate 401 is moved, the fastening screw 402 enters the second limiting groove 404, the fastening screw 402 is clamped in the second limiting groove 404 by moving the fixing plate 401, the fastening screw 402 can be clamped on the second limiting groove 404, then the fastening screw 402 is screwed to prevent the fixing plate 401 from moving, at this time, the pressing plate 407 is just located in the fixing groove 406, and it is avoided that when the table board 1 is used, the pressing plate 407 is higher than the table top and contacts with the arm of a person, and the use of the person is affected.

The implementation principle of the embodiment is as follows: when the drawing board 101 needs to be placed on the table board 1, the table board 1 is lifted upwards at first, the table board 1 is adjusted to a needed position through the angle adjusting device 5, then the fixing plate 401 is pushed, the fastening screw 402 is clamped in the first limiting groove 403, at this time, the upper boundary of the fixing plate 401 is higher than the upper boundary of the table board 1, a groove is formed between the pressing plate 407 and the table board 1, and the drawing board 101 is placed in the groove, so that the drawing board 101 is fixed on the table board 1.

When the drawing board 101 is not needed, the table board 1 needs to be placed flat, the drawing board 101 is taken away firstly, the table board 1 is placed flat through the angle adjusting device 5, then the fixing plate 401 is moved, the fastening screw 402 is clamped in the second limiting groove 404, then the fastening screw 402 is screwed down, the fixing plate 401 cannot be moved, and the pressing plate 407 can be located in the fixing groove 406, so that the use of people cannot be influenced.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides an easel desk with drawing board fixing device, includes table (1) and deposits drawing board (101) on table (1), its characterized in that is fixed with fastening screw (402) on table (1) lateral wall, still is connected with fixed plate (401) between table (1) and fastening screw (402), sets up first spacing groove (403) with fastening screw (402) chucking each other on fixed plate (401), fixed plate (401) upper end protrusion in table (1) surface during the chucking.

2. The easel desk with the drawing board fixing device according to claim 1, wherein a second limiting groove (404) tightly clamped with the fastening screw (402) is further formed in the fixing plate (401), the length of the second limiting groove (404) is larger than that of the first limiting groove (403), a connecting groove (405) allowing the fastening screw (402) to slide is communicated between the first limiting groove (403) and the second limiting groove (404), and the upper end of the fixing plate (401) is flush with the surface of the desk plate (1) when the second limiting groove (404) is tightly clamped with the fastening screw (402).

3. The easel desk with the drawing board fixing device according to claim 1, wherein a support frame (2) is arranged below the desk board (1), the desk board (1) is hinged to the support frame (2) through a desk board connecting shaft (3), and an angle adjusting device (5) for adjusting the angle of the desk board (1) is further connected between the support frame (2) and the desk board (1).

4. The easel desk with the sketchpad fixing device according to claim 3, wherein the angle adjusting device (5) comprises an upper stay (501) hinged on the desk board (1) and a lower stay (502) hinged on the support frame (2), the upper stay (501) and the lower stay (502) are hinged through a hinge shaft (504), and a support component (510) is connected between the upper stay (501) and the lower stay (502).

5. The easel desk with the sketchpad fixing device according to claim 4, wherein the lower stay (502) is provided with a first groove (505), when the desk board (1) is laid flat, the upper stay (501) and the lower stay (502) are in a closed state, and the upper stay (501) is located in the first groove (505).

6. The easel desk with the drawing board fixing device according to claim 5, wherein the supporting component (510) comprises a fixing shaft (511) connected in the first groove (505), the fixing shaft (511) is hinged with a connecting rod (512), the upper support rod (501) is provided with a second groove (506), the inner diameter of the second groove (506) is larger than the opening of the second groove (506), two rows of clamping grooves (515) are formed in the opening ends of the two side walls of the second groove (506), a sliding block (513) which is hinged with the connecting rod (512) and can slide in the second groove (506) is further arranged in the second groove (506), and a pair of limiting columns (516) which are mutually clamped with the clamping grooves (515) is arranged on the part, exposed out of the second groove (506), of the sliding block (513).

7. The easel desk with the sketchpad fixing device according to claim 6, wherein a hanging ring (514) is arranged on the connecting rod (512), a hanging ring (514) is also arranged on the hinge shaft (504), and a tension spring (517) for pulling the connecting rod (512) is connected between the two hanging rings (514).

8. The easel desk with panel retainer according to claim 1 wherein a hold down plate (407) is attached to the retainer (401) for holding down the panel (101).

9. The easel desk with the sketchpad fixing device according to claim 8, wherein the desk board (1) is provided with a fixing groove (406) for storing the pressing plate (407).