CN209683507U - A kind of folding desk board - Google Patents

Abstract

The utility model relates to automobile technical fields, more particularly, to a kind of folding desk board.The advantages of folding desk board includes: that can be accommodated in armrest, is occupied little space.The folding desk board is used for handrail, comprising: containing cavities, panel and the support device formed in handrail；Panel is arranged in support device, and can fold or open relative to support device；Support device is rotatably installed on handrail, so that support device drives in the common storage to containing cavities of both panels.In use, can be according to installation site and use demand, rotation support device and/or panel with the position of adjusting panel and state, and then make panel be in the suitable state of user for user's use.After use, rotation support device and/or panel, so that support device and panel are rotated in closed state, at this point, folding desk board can be accommodated in the containing cavities of armrest, to reduce the occupied space of folding desk board.

Description

A kind of folding desk board

Technical field

The utility model relates to automobile technical fields, more particularly, to a kind of folding desk board.

Background technique

With the development of science and technology, family-sized car and commercial vehicle are gradually popularized, they people routine work and live Play increasingly important role.Wherein, many people can make full use of riding time to handle official business or learn, and therefore, occur not For office softwares such as passenger's placement computer, files, wage-earners can be used desktop office or place object desktop with style Product, student can learn on desktop.Interior desktop is the office and academic environment that people provide convenience, increasingly by people Welcome.

But since the figure of desktop is larger, occupied space is larger, can waste interior sky significantly when not using desktop Between.

Utility model content

The utility model is to propose in view of the above problems, and its purpose is to provide a kind of folding desk board, the folding tables The advantages of plate includes: that can be accommodated in armrest, is occupied little space.

For realization the purpose of this utility model, adopt the following technical scheme that:

A kind of folding desk board is used for handrail, comprising: containing cavities, panel and the support device formed in the handrail；

The panel is arranged in the support device, and can fold or open relative to the support device；

The support device is rotatably installed on the handrail, so that the support device drives both described panels In common storage to the containing cavities.

Further, the support device includes the first support arm and the second support arm；

One end of first support arm is rotationally connected with the handrail on first surfaces of revolution；First support arm The other end and second support arm rotation connection, and second support arm can be relative to first support arm second It is rotated on the surfaces of revolution；

The panel rotation is installed on one end away from first support arm of second support arm, and the panel It can be rotated on the third surfaces of revolution；

There is angle between first surfaces of revolution and second surfaces of revolution；

There is angle between second surfaces of revolution and the third surfaces of revolution.

Further, position-limit mechanism, the position restrainer are equipped between first support arm and second support arm Structure includes support plate, and one end of the support plate and first support arm are rotatablely connected；

Second support arm is equipped with the sliding slot that can accommodate the support plate；

Second support arm relative to first support arm when being rotated on second surfaces of revolution, the support One end away from first support arm of plate can be abutted against with the cell wall of the sliding slot to limit the support plate, and then is limited Position second support arm.

Further, the position-limit mechanism further includes sliding block, and the sliding block is rotatablely installed deviating from the support plate One end of first support arm；

The sliding block can slide in the sliding slot, and can be with the slot away from first support arm of the sliding slot Wall offsets to limit the support plate.

Further, the support device further includes being installed on the mounting base of the handrail, and first support arm turns It is dynamic to be installed in the mounting base；

First support arm can be rotated in a first direction to open, or in a second direction on first surfaces of revolution Rotation is to be closed；

The first direction and the second direction are opposite.

Further, the side towards the mounting base of first support arm is equipped with the first elastic layering；

The side of the mounting base is equipped at least one limiting slot；First elastic layering is in first support arm When along first direction rotation, it can offset with the cell wall of the limiting slot to limit described first in said first direction Support arm.

Further, the support device further includes scroll spring, one end of the scroll spring and the mounting base Connection, the other end are connect with first support arm；The scroll spring for limiting described first in this second direction Support arm.

Further, the first limit hole is offered on the panel；

One end towards the panel of second support arm is provided with spacer pin；The spacer pin exists in the panel When being rotated on the third surfaces of revolution, it is able to enter first limit hole and offsets with the hole wall of first limit hole, with The panel is circumferentially limited on the third surfaces of revolution.

Further, the panel includes the first plate and the second plate of rotation connection；First plate and institute It states and forms center of rotation between the second plate；

First plate and second plate can be expanded in same plane, or are folded to and are bonded to each other.

Further, the side close to the center of rotation of first plate is provided with the second elastic layering；

The side close to the center of rotation of second plate is correspondingly arranged on the first groove；

When second elastic layering is embedded in first groove, first plate and second plate holding are beaten Open state；

And/or；

The side away from the center of rotation of first plate is provided with third elastic layering；

The side away from the center of rotation of second plate is correspondingly arranged on the second groove；

When the third elastic layering is embedded in second groove, first plate and second plate keep patch Conjunction state.

In conjunction with above technical scheme, the utility model has the following beneficial effects:

The utility model provides a kind of folding desk board, is used for handrail, comprising: the containing cavities that are formed in handrail, panel and Support device；Panel is arranged in support device, and can fold or open relative to support device；Support device is rotatable It is installed on handrail, so that support device drives in the common storage to containing cavities of both panels.

In above-mentioned folding desk board, support device is rotatablely installed in handrail, and panel is installed in support device, and panel It can be relative to support device open or close.In use, can be according to installation site and use demand, rotation support device And/or panel, with the position of adjusting panel and state, and then panel is made to be in the suitable state of user so that user makes With.After use, rotation support device and/or panel, so that support device and panel are rotated in closed state, this When, folding desk board can be accommodated in the containing cavities of armrest, to reduce the occupied space of folding desk board.

It should be noted that the two sides of handrail can be respectively mounted above-mentioned folding desk board in the utility model, can also only exist Side is installed by above-mentioned folding desk board.

Detailed description of the invention

It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art Under the premise of labour, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is that first support arm and the second support arm are in closure in folding desk board provided by the embodiment of the utility model The structural schematic diagram of state；

Fig. 2 is that first support arm and the second support arm are in opening in folding desk board provided by the embodiment of the utility model The structural schematic diagram of state；

Fig. 3 is that second support arm is in the position restrainer under closed state in folding desk board provided by the embodiment of the utility model The structural schematic diagram of structure；

Position restrainer of the Fig. 4 for the second support arm in folding desk board provided by the embodiment of the utility model under in the open state The structural schematic diagram of structure；

Fig. 5 be folding desk board provided by the embodiment of the utility model in the first support arm in the closure state first elasticity The position view of press strip；

Fig. 6 be folding desk board provided by the embodiment of the utility model in the first support arm in the open state first elasticity The position view of press strip；

Fig. 7 is the structural schematic diagram of the limiting slot of mounting base in folding desk board provided by the embodiment of the utility model；

Fig. 8 is that the position of spacer pin when panel is in active state in folding desk board provided by the embodiment of the utility model shows It is intended to；

Fig. 9 is that the position of spacer pin when panel is in extreme position in folding desk board provided by the embodiment of the utility model shows It is intended to；

Figure 10 is the structural schematic diagram of the first limit hole in folding desk board provided by the embodiment of the utility model；

Figure 11 is the structural representation that second plate is in the open state in folding desk board provided by the embodiment of the utility model Figure；

Figure 12 is the bottom view that second plate is in closed state in folding desk board provided by the embodiment of the utility model.

Icon: 100- panel；The first limit hole of 110-；The first plate of 120-；The second plate of 130-；The first groove of 131-； The second groove of 132-；The second elastic layering of 140-；150- third elastic layering；200- support device；The first support arm of 210-； The first elastic layering of 211-；The second support arm of 220-；221- sliding slot；The second limit hole of 2211-；222- spacer pin；230- limit Mechanism；231- support plate；232- sliding block；The 4th elastic layering of 233-；240- mounting base；241- limiting slot；250- scroll spring； First surfaces of revolution of 300-；400- handrail；Second surfaces of revolution of 500-；The 600- third surfaces of revolution；A- first direction；B- second direction.

Specific embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical Novel protected range.

It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition The concrete meaning of language in the present invention.

Below according to the overall structure of folding desk board provided by the utility model, embodiment is illustrated.

In the prior art, since the figure of desktop is larger, occupied space is larger, can waste significantly when not using desktop Interior space.

In contrast, present embodiments providing a kind of folding desk board, it is used for handrail 400, which to include: handrail Containing cavities, panel 100 and the support device 200 formed in 400；Panel 100 is arranged in support device 200, and can be opposite It folds or opens in support device 200；Support device 200 is rotatably installed on handrail 400, so that 200 band of support device In the common storage to containing cavities of both dynamic panels 100.

In above-mentioned folding desk board, support device 200 is rotatablely installed in handrail 400, and panel 100 is installed on support device On 200, and panel 100 can be relative to 200 open or close of support device.In use, can be according to installation site and use Demand, rotation support device 200 and/or panel 100 with the position of adjusting panel 100 and state, and then are in panel 100 The suitable state of user is for user's use.After use, rotation support device 200 and/or panel 100, so that branch Support arrangement 200 and panel 100 are rotated in closed state, at this point, folding desk board can be accommodated in the storage of armrest 400 It is intracavitary, to reduce the occupied space of folding desk board.

It should be noted that the two sides of handrail 400 can be respectively mounted above-mentioned folding desk board in the present embodiment, it can also be only Above-mentioned folding desk board is installed in side.

Specifically refering to fig. 1 and Fig. 2, support device 200 includes the first support arm 210 and the second support arm 220；First One end of brace 210 is rotationally connected with handrail 400 on first surfaces of revolution 300；The other end of first support arm 210 and second Brace 220 is rotatablely connected, and the second support arm 220 can revolve on second surfaces of revolution 500 relative to the first support arm 210 Turn；The rotational installation of panel 100 is in one end away from the first support arm 210 of the second support arm 220, and panel 100 can be the It is rotated on three-rotating-surface 600；There is angle between first surfaces of revolution 300 and second surfaces of revolution 500；Second surfaces of revolution 500 and There is angle between three-rotating-surface 600.

In above-mentioned folding desk board, the first support arm 210 is rotatablely installed in handrail 400, and the first support arm 210 can Relative to 400 Unscrew of handrail or closure on first surfaces of revolution 300；The rotational installation of second support arm 220 is in the first support One end away from handrail 400 of arm 210, and the second support arm 220 can be on second surfaces of revolution 500 relative to the first support arm 210 Unscrews or closure；Panel 100 is rotatablely installed in one end away from the first support arm 210 of the second support arm 220, and Panel 100 can be on the third surfaces of revolution 600 relative to 220 Unscrew of the second support arm or closure.In use, can basis Installation site and use demand rotate the first support arm 210 and/or the second support arm 220 and/or panel 100, with adjusting panel 100 position and state, and then panel 100 is made to be in the suitable state of user for user's use.After use, turn Dynamic first support arm 210 and/or the second support arm 220 and/or panel 100, so that the first support arm 210, the second support arm 220 It rotates with panel 100 in closed state, at this point, folding desk board can be accommodated in armrest 400, to reduce folding table The occupied space of plate.

It is rotatablely connected between first support arm 210 and the second support arm 220 by shaft.In addition, Fig. 3 and Fig. 4 are please referred to, When the second support arm 220 is relative to the first support arm 210 Unscrew on second surfaces of revolution 500, need to be kept for second Brace 220 is in the open state, therefore, position-limit mechanism 230, limit is arranged between the first support arm 210 and the second support arm 220 Position mechanism 230 includes support plate 231, and one end of support plate 231 and the first support arm 210 are rotatablely connected, specifically, support plate 231 and first are equipped with shaft between support arm 210, and support plate 231 being capable of axis rotation around the shaft.On second support arm 220 Equipped with the sliding slot 221 that can accommodate support plate 231, one end away from the first support arm 210 of support plate 231 is located at sliding slot 221 Inside, and can be slided in sliding slot 221.In the second support arm 220 relative to the first support arm 210 in second surfaces of revolution 500 Direction on when rotating, one end away from the first support arm 210 of support plate 231 can be abutted against with the cell wall of sliding slot 221 with Limit support board 231, and then limit the second support arm 220.Fig. 3 show the second support arm 220 and limits in the closure state The structure of mechanism 230, at this point, the first support arm 210 and the second support arm 220 are in same plane, support plate 231 fits in One support arm 210 and the second support arm 220.Fig. 4 show second support arm 220 position-limit mechanism 230 in the open state Structure, at this point, there is angle between the first support arm 210 and the second support arm 220, the first support arm of direction of support plate 231 210 one end rotates around the axis, and the cell wall phase with sliding slot 221 is slid into sliding slot 221 away from one end of the first support arm 210 It supports, the first support arm 210, the second support arm 220 and 231 three of support plate form gusseted form, and then limit second Brace 220 is kept open the second support arm 220.

Further, it is detached from sliding slot 221 during abutting in order to avoid support plate 231 with the cell wall of sliding slot 221, is supporting One end away from the first support arm 210 of plate 231 is rotatably equipped with sliding block 232, and sliding block 232 is connected by shaft and support plate 231 It connects.Sliding block 232 can slide in sliding slot 221, and can offset with the cell wall away from the first support arm 210 of sliding slot 221 with Limit support board 231.Sliding block 232 is parallel with the second support arm 220 always in sliding process, and sliding can be made more smooth.

Further, the second limit hole is offered on the cell wall of the side away from the first support arm 210 of sliding slot 221 2211.The side away from support plate 231 of sliding block 232 is equipped with the 4th elastic layering 233, and the 4th elastic layering 233 can be selected The materials such as rubber, silica gel.Slided in sliding slot 221 in sliding block 232 so that the second support arm 220 in the open state, the 4th Flexible deformation can occur for elastic layering 233, and be squeezed into the second limit hole 2211 with position limiting slide block 232.

But not limited to this, sliding slot 221 can also be set on the first support arm 210, support plate 231 and the second support arm 220 rotation connections.Elastic component can also be set towards one end of the second support arm 220 in the first support arm 210, elastic component can be with Rubber, the materials such as silica gel are selected, is correspondingly arranged groove in one end of the first support arm 210 of direction of the second support arm 220, the During two support arms, 220 rotating opening, elastic component is gradually embedded in groove, to guarantee that the second support arm 220 stays open State.Alternatively, it is also possible to which elastic component is set to the second support arm 220, groove is opened in the first support arm 210.

In addition, referring to Fig. 5, support device 200 further includes being installed on the mounting base 240 of handrail 400, mounting base 240 Section is circle, and the first support arm 210 is rotatablely installed in mounting base 240.First support arm 210 can be in first surfaces of revolution It rotates on 300 along first direction A to open, or B is rotated to be closed in a second direction；First direction A and second direction B are opposite.

Specifically, referring to Fig. 6, the side towards mounting base 240 of the first support arm 210 is equipped with the first elasticity pressure The side of item 211, the first elastic layering 211 and mounting base 240 offsets and compresses, the first elastic layering 211 can select rubber, The materials such as silica gel.Fig. 6 and Fig. 7 are please referred to, the side of mounting base 240 is equipped at least one limiting slot 241；First elastic layering 211 during the first support arm 210 is rotated along first direction A, and the first elastic layering 211 is in impaction state always, when When first elastic layering 211 moves to limiting slot 241, since 241 space of limiting slot is larger, to squeezing for the first elastic layering 211 Pressure effect reduces, and the deflection of the first elastic layering 211 reduces.Meanwhile first elastic layering 211 can be with limiting slot 241 Cell wall offsets with the first support arm of A upper limit 210 in a first direction.In the present embodiment, there are three limiting slots 241 for setting, i.e., in fact Show the first support arm 210 in the limit of three different rotational angles, to realize the control of three gears.In addition, referring to Fig. 7, Since the first elastic layering 211 and the side of mounting base 240 are in squeezed state always, mounting base 240 can generate mill Limiting slot 241, can be set on arc panel by damage at this time, and arc panel is installed on mounting base 240, after arc panel generates abrasion, It can directly replace, without replacing entire mounting base 240, reduce maintenance cost.

In addition, in order to reduce the abrasion between mounting base 240 and the first elastic layering 211, in the first elastic layering 211 The support and spring that one end of mounting base 240 is provided with connecting shaft and is set in connecting shaft；Connecting shaft with first Brace 210 connects.Support has accommodation space, and spring is located in accommodation space, and the top surface of one end of spring and accommodation space It offsets, the other end is connect with the first elastic layering 211, and there is spring the first elastic layering 211 of driving to push against mounting base 240 always Active force.The avoid holes for avoiding the first elastic layering 211 are offered on the bottom surface of accommodation space.When the first elastic layering 211 on the side of mounting base 240 when sliding, spring contraction；When the first elastic layering 211 moves in limiting slot 241, In Under the restoring force effect of spring, the first elastic layering 211 pushes against limiting slot 241.

Further, referring to Fig. 7, the first elastic layering 211 is in the first support arm 210 mistake that B is rotated in a second direction Cheng Zhong, the first support arm 210 are gradually closed, and after the first support arm 210 is closed completely, need to limit the first support arm 210 Therefore position is provided with a limiting slot 241 in the other end of arc panel.

In addition, referring to Fig. 5, support device 200 further includes scroll spring 250, one end of scroll spring 250 and mounting base 240 connections, the other end are connect with the first support arm 210；Scroll spring 250 is used in second direction B the first support arm of upper limit 210.When the first elastic layering 211 the first support arm 210 in a second direction B turn to be closed completely after, the first support arm 210 It can be abutted with scroll spring 250, scroll spring 250, which is under pressure, to be occurred flexible deformation and generate restoring force, with driving first Brace 210 makes it generate the trend moved along first direction A, and then in the first support arm of second direction B upper limit 210.

In addition, please referring to Fig. 8 to Figure 10, the first limit hole 110 is offered on panel 100；The direction of second support arm 220 One end of panel 100 is provided with spacer pin 222；Spacer pin 222 in panel 100 when being rotated on the third surfaces of revolution 600, Neng Goujin Enter the first limit hole 110 and offset with the hole wall of the first limit hole 110, with confined planes plate circumferential on the third surfaces of revolution 600 100.The position of the first limit hole 110 is shown in Figure 10, specifically: it is provided with rotating disc on panel 100, is opened up on rotating disc There are the first limit hole 110, a side opening of the first limit hole 110, the width of opening is less than the diameter of spacer pin 222.Limit When pin 222 is around the center rotating of rotating disc, it can be pressed through above-mentioned opening, and (please specifically join in the first limit hole 110 of entrance Read Fig. 9).Wherein, the part for opening up the first limit hole 110 of rotating disc can select elastic material.Furthermore it is possible in rotating disc On open up rotation slot, for spacer pin 222 be oriented to.

In order to increase the usable floor area of panel 100, accordion structure is set by panel 100, specifically, please referring to figure 11 and Figure 12, panel 100 include the first plate 120 and the second plate 130 of rotation connection；First plate 120 and the second plate Center of rotation is formed between 130；First plate 120 and the second plate 130 can be expanded in same plane, or are folded to It is bonded to each other.

Wherein, when panel 100 is in unfolded state, in order to avoid the second plate 130 is fallen, need to limit the second plate 130 in the position of opening state, specifically, the side of the close center of rotation of the first plate 120 is provided with the second elasticity pressure Item 140, the second elastic layering 140 can select the materials such as rubber, silica gel.The side of the close center of rotation of second plate 130 It is correspondingly arranged on the first groove 131.During the second 130 rotating opening of plate, the second elastic layering 140 is gradually embedded in the In one groove 131, the first plate 120 and the second plate 130 are kept open.But not limited to this, it can also be by the second elasticity Press strip 140 is set on the second plate 130, and the first groove 131 is set on the first plate 120.

In addition, panel 100 in the closure state, in order to avoid crushing user, need the first plate 120 and second Plate 130 is in fit-state always, therefore, the side away from center of rotation of the first plate 120 is provided with third elasticity Press strip 150, third elastic layering 150 can select the materials such as rubber, silica gel.Second plate 130 away from the one of center of rotation Side is correspondingly arranged on the second groove 132；When being closed the second plate 130, third elastic layering 150 can gradually be embedded in the second groove In 132, the first plate 120 and the second plate 130 keep fit-state.But not limited to this, it can also be by third elastic layering 150 It is set on the second plate 130, the second groove 132 is set on the first plate 120.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (10)

1. a kind of folding desk board is used for handrail characterized by comprising containing cavities, panel and the support formed in the handrail Device；

The panel is arranged in the support device, and can fold or open relative to the support device；

The support device is rotatably installed on the handrail, so that the support device drives both described panels common In storage to the containing cavities.

2. folding desk board according to claim 1, which is characterized in that the support device includes the first support arm and second Support arm；

One end of first support arm is rotationally connected with the handrail on first surfaces of revolution；First support arm it is another End and second support arm rotation connection, and second support arm can be relative to first support arm in the second rotation It is rotated on face；

The panel rotation is installed on one end away from first support arm of second support arm, and the panel can It is rotated on the third surfaces of revolution；

There is angle between first surfaces of revolution and second surfaces of revolution；

There is angle between second surfaces of revolution and the third surfaces of revolution.

3. folding desk board according to claim 2, which is characterized in that first support arm and second support arm it Between be equipped with position-limit mechanism, the position-limit mechanism includes support plate, one end of the support plate and first support arm rotation connect It connects；

Second support arm is equipped with the sliding slot that can accommodate the support plate；

Second support arm relative to first support arm when being rotated on second surfaces of revolution, the support plate It can be abutted against with the cell wall of the sliding slot away from one end of first support arm to limit the support plate, and then limit institute State the second support arm.

4. folding desk board according to claim 3, which is characterized in that the position-limit mechanism further includes sliding block, the sliding block It is rotatablely installed in one end away from first support arm of the support plate；

The sliding block can slide in the sliding slot, and can be with the cell wall phase away from first support arm of the sliding slot To limit the support plate.

5. folding desk board according to claim 2, which is characterized in that the support device further includes being installed on the handrail Mounting base, first support arm rotational installation is in the mounting base；

First support arm can be rotated in a first direction to open on first surfaces of revolution, or is rotated in a second direction, With closure；

The first direction and the second direction are opposite.

6. folding desk board according to claim 5, which is characterized in that first support arm towards the mounting base Side is equipped with the first elastic layering；

The side of the mounting base is equipped at least one limiting slot；First elastic layering is in first support arm along institute When stating first direction rotation, it can offset with the cell wall of the limiting slot to limit first support in said first direction Arm.

7. folding desk board according to claim 5, which is characterized in that the support device further includes scroll spring, described One end of scroll spring is connect with the mounting base, and the other end is connect with first support arm；The scroll spring is used for First support arm described in the second direction upper limit.

8. folding desk board according to claim 2, which is characterized in that offer the first limit hole on the panel；

One end towards the panel of second support arm is provided with spacer pin；The spacer pin is in the panel described When being rotated on the third surfaces of revolution, it is able to enter first limit hole and offsets with the hole wall of first limit hole, in institute It states and circumferentially limits the panel on the third surfaces of revolution.

9. folding desk board according to claim 2, which is characterized in that the panel include rotation connection the first plate and Second plate；Center of rotation is formed between first plate and second plate；

First plate and second plate can be expanded in same plane, or are folded to and are bonded to each other.

10. folding desk board according to claim 9, which is characterized in that the close center of rotation of first plate Side be provided with the second elastic layering；

The side close to the center of rotation of second plate is correspondingly arranged on the first groove；

When second elastic layering is embedded in first groove, first plate and second plate stay open shape State；

And/or；

The side away from the center of rotation of first plate is provided with third elastic layering；

The side away from the center of rotation of second plate is correspondingly arranged on the second groove；

When the third elastic layering is embedded in second groove, first plate and second plate keep fitting shape State.