WO2016190464A1 - Standing and sitting desk - Google Patents

Abstract

The present invention relates to a standing and sitting desk in which one desk can be freely converted for standing and sitting use, wherein a sub top board disposed in a seating recess formed in a main top board has a top end that is positioned higher than the top surface of the main top board when raised, and the top surface of the sub top board and the top surface of the main top board have the same height as each other when the sub top board is lowered.

Description

Up-and-down shared desk

The present invention relates to a standing and sitting common desk, and more particularly to a standing and sitting common desk that can be used to freely convert the standing and sitting to one desk.

In general, standing desks are currently used in various occupations in various fields, and are used in offices as well as at home.

Standing or studying or working to reduce the strain on your lower back is the most recommended posture for back pain or back problems, and it also helps to improve your concentration.

Despite these advantages, standing desks are generally not widely used.

It is also because the general work environment consists of a sedentary structure, but it is due to some conflicting characteristics of the standing desk itself.

That is, the standing desk is longer than the sitting desk where the legs of the desk sit and use because of the structural characteristics used by the operator.

In order to work long hours at such a standing desk, the worker must always stand and think about the resulting accumulation of fatigue.

In addition, long-legged upright chairs adapted to the height of the sitting desk are too high to support their independent functions (e.g., regular desks), and stand up, which is an advantage of the standing desk, to increase concentration and reduce waist burden. It does not meet the purpose.

In addition, in a workplace with a lot of goods to be stored, it is necessary to secure a separate space for storing a standing chair.

As a result, there is a need for a desk based on a legless desk and a legless chair, but the development of a desk that can utilize a standing desk function, that is, a sitting-up common desk.

An object of the present invention is to provide a standing and sitting common desk that can be used as a common sitting and sitting in one desk.

In order to achieve the above object, the standing and sitting common desk of the present invention includes a main upper plate having an upper surface and a lower surface, and a recessed groove open upward in a portion of the upper surface to be concave downward; A support for supporting the main top plate in an upward direction; A sub-top plate having a size smaller than that of the main top plate so as to be independently liftable in an up and down direction with respect to the main top plate, and inserted into the seating groove when descending; One end is coupled to the main top plate and the other end is coupled to the sub top plate, the lifting portion for elevating the sub top plate in the up and down direction with respect to the main top plate, comprising a lower portion of the seating groove on the main top plate It is blocked by the formed storage unit, the lower portion of the sub-top plate when the lower portion of the sub-top plate, the lifting portion is disposed inside the seating groove so that the upper surface of the main top plate when the sub-top plate is raised The upper surface of the sub-top and the upper surface of the main top plate have the same height when the sub-top plate is lowered, and the upper surface of the sub-top plate is higher than the upper surface of the main top plate when the sub-top plate is raised. It is characterized in that the arrangement.

An upper surface and a lower surface of the main upper plate are formed in a flat plate shape, and the accommodating portion blocking the lower portion of the seating groove is integrally formed on the main upper plate.

In the state in which the sub-top plate is inserted into the seating groove, two or more sides of the side surfaces of the sub-top plate face the inner surface of the seating groove.

In this case, the sub-top plate is formed in a rectangular flat plate shape, the seating groove is formed in a rectangular shape corresponding to the sub-top plate, the seating groove is one of the four inner surface is opened in the horizontal direction to form an open portion, Three of the four side surfaces of the sub-top face the three inner surfaces of the seating groove, and the other one side of the sub-top plate is preferably exposed to the outside through the opening.

The cover plate may further include a cover plate which covers an upper portion of the seating recess at a lower portion of the sub upper plate when the sub upper plate is raised.

At this time, it is preferable that the cover plate is drawn out from the main top plate to cover the upper portion of the seating groove.

And, when the cover plate covers the upper portion of the seating groove, the upper surface of the cover plate is to have the same height as the upper surface of the main top plate.

The area of the upper surface of the sub-top plate may be changed in the raised state.

The sub top plate, the lifting plate is coupled with the other end of the lifting portion; It is composed of a wing plate which is coupled to the lifting plate to be rotatably coupled or sliding withdrawal to change the area of the sub-top plate.

The lifting unit includes a pair of first rail members coupled to an inner surface of the seating groove; A pair of second rail members coupled to side surfaces of the sub-top plate; And a pair of link members sliding along the first rail member and the second rail member when the sub upper plate is elevated, and the height of the sub upper plate is lowered. It is accommodated in the seating groove between the top plate, the height of the sub-top plate is variable by adjusting the height of the link member.

The first rail member has a long guide-shaped first guide groove formed in the front and rear direction, and the second rail member has a long guide-shaped second guide groove formed in the front and rear direction, and the one end of the link member is A first link slidably coupled to a first guide groove and the other end rotatably coupled to a side surface of the sub upper plate or the second rail member; One end is rotatably coupled to the inner surface of the seating groove or the first rail member, and the other end is composed of a second link slidably coupled to the second guide groove, wherein the first link and the second link have a central portion. They cross each other in 'X' shape.

A center portion of the first link and the second link are constrained to be rotatable with each other.

The first guide groove is located in front of one end of the second link, the second guide groove is located in front of the other end of the first link, the center of gravity point acting on the sub top plate when the sub top plate is raised Is positioned in front of the other end of the second link inserted into the second guide groove, to prevent the sub-top plate is lowered.

Alternatively, at least one of the first guide grooves and the second guide grooves is formed with a locking jaw, one end of the first link or the other end of the second link is hooked to the locking jaw when the sub-top is ascended The member and sub-top plate are prevented from lowering.

In this case, the lifting unit, the one end of the pair of the first link is connected to each other, or the other end of the pair of the second link is made of a further comprising a locking shaft, the locking shaft is a pair of the first guide groove Alternatively, the second guide groove may be disposed across the pair of second guide grooves, and the locking shaft may be caught by a locking jaw to prevent the link member and the sub-top from descending.

The length of the first link or the second link may vary.

According to the standing and sitting common desk of the present invention as described above has the following effects.

One desk can be used for both sitting and standing according to the user's will, and in particular, it can be used as a standing desk by raising the sub-top while maintaining the sitting table (main board).

1 is a perspective view of a desk according to a first embodiment of the present invention,

2 is an exploded perspective view of a desk according to a first embodiment of the present invention;

Figure 3 is a side cross-sectional structure diagram in the state shown in Figure 1,

4 is a perspective view of a sub-top plate in a raised state in a desk according to a first embodiment of the present invention;

Figure 5 is a side cross-sectional structure diagram in the state shown in Figure 4,

6A and 6B are a perspective view and a side cross-sectional structural view of opening and closing the seating groove by the cover plate in the state shown in FIG. 4;

FIG. 7 is a perspective view of a state in which a sub-top plate is expanded and an area thereof is increased in the state shown in FIG. 4; FIG.

8 is a perspective view of a state in which the sub-top plate is raised in the desk according to the second embodiment of the present invention;

9A and 9B are side cross-sectional structural views illustrating a process of lifting and lowering a sub-top plate by a lifting unit in a desk according to a second embodiment of the present invention;

10 is a perspective view of a state in which a locking axis is added in the desk according to the second embodiment of the present invention;

11A and 11B are structural diagrams illustrating a structure in which a length of a link member is variable in a desk according to a third embodiment of the present invention;

First embodiment

1 is a perspective view of a desk according to a first embodiment of the present invention, Figure 2 is an exploded perspective view of a desk according to a first embodiment of the present invention, Figure 3 is a side cross-sectional structural view in the state shown in FIG. 4 is a perspective view of a sub-top plate raised from a desk according to a first embodiment of the present invention, FIG. 5 is a side cross-sectional structural view of the state shown in FIG. 4, and FIGS. 6A and 6B are shown in FIG. 4. Figure 7 is a perspective view and a side cross-sectional structural view of opening and closing the seating groove by the cover plate in the state, Figure 7 is a perspective view of a state in which the sub-top plate is expanded to increase the area in the state shown in FIG.

As shown in FIGS. 1 to 7, the standing and sitting common desk of the present invention includes a main top plate 10, a support unit 20, a sub top plate 30, a lifting unit 40, and the like. .

The main upper plate 10 is formed in a flat shape having a top surface and a bottom surface flat.

The support 20 is made of three or more, preferably four, to support the main top plate 10 in the upward direction with respect to the ground.

The sub-top plate 30 is coupled to the lifting unit 40 to be capable of lifting up and down independently of the main top plate 10.

One end of the elevating unit 40 is coupled to the main top plate 10 and the other end is coupled to the sub top plate 30 to elevate the sub top plate 30 in the up and down direction with respect to the main top plate 10. .

A portion of the upper surface of the main upper plate 10 is recessed in the downward direction the mounting groove 11 which is open in the upward direction.

The sub upper plate 30 is inserted into the seating groove 11 when the sub upper plate 30 is lowered by the elevating unit 40.

To this end, the size of the sub-top plate 30 is smaller than that of the main top plate 10.

The seating groove 11 may be formed in various shapes, but is preferably formed in a quadrangular shape as in the present embodiment.

When the sub upper plate 30 is lowered, the upper surface of the sub upper plate 30 and the upper surface of the main upper plate 10 have the same height, and when the sub upper plate 30 is raised, An upper surface is positioned at a position higher than an upper surface of the main upper plate 10.

1 and 3, the upper surface of the sub upper plate 30 and the upper surface of the main upper plate 10 have the same height when the sub upper plate 30 descends, and thus, the main upper plate ( 10) and the book on the upper surface of the sub-top plate 30 without step, the user can use the desk in a seated state sitting on a chair or the like.

4 and 5, when the sub upper plate 30 is lifted by the lifting unit 40, the upper surface of the sub upper plate 30 is located at a position higher than the upper surface of the main upper plate 10. The user may use the desk in a standing state by placing a book or the like on the upper surface of the raised sub-top plate 30.

In the state where the sub-top plate 30 is inserted into the seating groove 11, two or more side surfaces of the side of the sub-top plate 30 face the inner surface of the seating groove 11.

In the present embodiment, the sub top plate 30 is formed in a square flat plate shape, and the seating groove 11 is formed in a quadrangular shape corresponding to the sub top plate 30.

In addition, one of the four inner surfaces of the seating groove 11 is open in the horizontal direction to form an opening 12, three of the four side surfaces of the sub-top plate 30 is the seating groove 11 The three inner side surfaces of the sub upper plate 30 are exposed to the outside through the opening 12.

Unlike the present embodiment, when the seating groove 11 is formed in the corner portion of the sub-top plate 30, the opening 12 is formed in two places, and among the side surfaces of the sub-top plate 30. Two face two inner surfaces of the seating groove 11.

In addition, the seating groove 11 may be formed inside the main top plate 10 without opening in the lateral direction.

The seating groove 11 is to be blocked by the lower portion 14.

The accommodating part 14 is integrally formed in the main upper plate 10 to block a lower portion of the seating groove 11, and when the sub upper plate 30 descends, the accommodating part 14 is the sub upper plate 30. Is disposed at the bottom.

When the sub upper plate 30 is lifted by the accommodating part 14, an object or the like may be placed on the accommodating part 14.

The elevating portion 40 for elevating the sub upper plate 30 is disposed inside the seating groove 11, and when the sub upper plate 30 is raised, an upper end of the elevating portion 40 is the sub upper plate. Ascending with the (30) is positioned higher than the upper surface of the main top plate (10).

The lifting unit 40 includes a first rail member 41, a second rail member 43, a link member 46 and the like.

The first rail member 41 is formed in a long rod shape and is composed of a pair, it is coupled to the inner surface of the seating groove (11).

The second rail member 43 is formed in a long rod shape and is composed of a pair, it is coupled to the side of the sub-top plate (30).

The first rail member 41 has an elongated first guide groove 42 formed in the front and rear direction, and the second rail member 43 has an elongated second guide groove 44 formed in the front and rear direction. It is formed long.

The link member 46 is formed in pairs and disposed on both sides of the sub upper plate 30, and slides along the first rail member 41 and the second rail member 43 when the sub upper plate 30 is elevated. The height is adjusted.

The link member 46 is composed of a first link 47 and a second link 48.

The first link 47 is formed in an elongated rod shape, one end of which is slidably coupled to the first guide groove 42, and the other end of which is the side of the sub-top plate 30 or the second rail member 43. Is rotatably coupled.

The second link 48 is formed in a long rod shape, one end is rotatably coupled to the inner surface of the seating groove 11 or the first rail member 41, the other end is the second guide groove 44 Slidably coupled to).

The first link 47 and the second link 48 as described above are arranged so that the center crosses each other in an 'X' shape, and the first link 47 and the second link 48 have a center like scissors. It is constrained to be rotatable.

The first guide groove 42 is located in front of one end of the second link 48, the second guide groove 44 is located in front of the other end of the first link 47.

The lifting unit 40 as described above is accommodated in the seating groove 11 between the main upper plate 10 and the sub upper plate 30 when the sub upper plate 30 is lowered, the link member 46 of the By adjusting the height, the height of the sub-top plate 30 is variable.

In addition, in order to prevent the sub-top plate 30 from being arbitrarily lowered while the sub-top plate 30 is raised by the elevating unit 40, in the present embodiment, the sub-top plate 30 is lifted at the maximum. The center of gravity acting on the sub-top plate 30 is positioned in front of the other end of the second link 48 inserted into the second guide groove 44.

The center of gravity acting on the sub upper plate 30 may be generated by the weight of the sub upper plate 30 itself, or a book or the like is placed on the upper surface of the sub upper plate 30 as shown in FIG. 5. It may be generated by the external force (F).

As described above, the center of gravity of the second link 48 inserted into the second guide groove 44 by the center of gravity acting on the sub upper plate 30 by its own weight or external force in the state in which the sub upper plate 30 is raised up to the maximum. By being located ahead of the other end, a force to be raised is applied to the other end of the first link 47 so that one end of the first link 47 does not move forward along the first guide groove 42. The other end of the second link 48 is not moved forward along the second guide groove 44 due to the center of gravity and the frictional force acting on the sub upper plate 30 located at the front.

Accordingly, the sub-top plate 30 may prevent the sub-top plate 30 from being arbitrarily lowered to a center of gravity acting on the sub-top plate 30 without a separate stopper in the maximum raised state.

At this time, when a book or the like is placed in front of the sub-top plate 30, the center of gravity acting on the sub-top plate 30 is further located forward, so that the lifting unit 40 may not be lowered. .

Meanwhile, the desk of the present invention may further include a cover plate 13 covering the upper portion of the seating groove 11 at the lower portion of the sub upper plate 30 when the sub upper plate 30 is raised.

The cover plate 13 may cover the upper portion of the seating groove 11 in various positions and various structures.

In the present embodiment, the cover plate 13 is slid out from the main top plate 10 as shown in FIGS. 6A and 6B to cover the upper portion of the seating groove 11.

Even when the sub-top plate 30 is raised by the cover plate 13 as described above, the height of the upper surface of the main upper plate 10 and the upper surface of the cover plate 13 can be almost the same.

In addition, the area of the upper surface of the sub-top plate 30 may be changed in an elevated state.

To this end, the sub upper plate 30 is the elevating plate 31 to which the other end of the elevating unit 40 is coupled, the sub upper plate 30 is coupled to the elevating plate 31 to be rotatably coupled or sliding withdrawable It consists of a wing plate 32 for varying the area of the.

In the present exemplary embodiment, the wing plate 32 is slid out from the side of the lifting plate 31 as shown in FIG. 7, but the wing plate 32 rotates on the side of the lifting plate 31. It is possible to change the area of the sub-top plate 30 by being coupled to the wing plate 32 is rotated and deployed.

Hereinafter, an operation process of the present invention having the above-described configuration will be described.

When the user intends to use the seat as a desk, the sub top plate 30 is seated in the seating groove 11 as shown in FIGS. 1 and 3.

At this time, since the upper surface of the sub-top plate 30 and the upper surface of the main top plate 10 have the same height, it can be used in the same way as a general desk.

On the other hand, when the user wants to use the desk as a standing, that is, when the user wants to use the desk in the standing state, the sub-top 30 is lifted upward.

Then, the sub top plate 30 is raised while the other end of the link member 46 coupled to the sub top plate 30 is also raised.

4 and 5, one end of the first link 47 moves backward along the first guide groove 42, and the other end of the second link 48 is formed in the first link 47. While moving backward along the two guide grooves 44, the height of the link member 46 is increased.

In this state, that is, the state in which the sub-top plate 30 is at maximum rise, the center of gravity acting on the sub-top plate 30 may be caused by the weight of the sub-top plate 30 itself or the weight of the book placed on the sub-top plate 30. Since it is located ahead of the other end of the second link 48, one end of the first link 47 and one end of the second link 48 is not moved forward.

Thus, the sub-top plate 30 can be maintained in an elevated state, and the user can stand and view a book placed on the sub-top plate 30.

As described above, in the state in which the sub-top plate 30 is raised, the user may put things on the main top plate 10, and at the same time, using one desk, standing and sitting may be utilized.

In addition, an object or the like may be placed on the accommodating portion 14, and as shown in FIGS. 6A and 6B, the cover plate 13 may cover the upper portion of the seating groove 11. The height of the upper surface of 13) and the upper surface of the main upper plate 10 may be almost the same, and may be used as a general sitting desk.

In addition, as shown in FIG. 7, the wing plate 32 is drawn out to increase the area of the upper surface of the sub-top plate 30 so that a large book or an object can be easily placed on the sub-top plate 30. Will be.

As described above, the present invention can be used as a seating and standing using one desk, and furthermore, since the sub-top 30 is lifted independently from the main top 10, it is also possible to use both seating and standing.

Second embodiment

8 is a perspective view of a state in which the sub-top plate is raised in the desk according to the second embodiment of the present invention, Figures 9a and 9b is a process of lifting the sub-top plate by the lifting unit in the desk according to the second embodiment of the present invention Figure 10 is a side cross-sectional view showing a structure, Figure 10 is a perspective view of a state in which the locking axis is added in the desk according to the second embodiment of the present invention.

As shown in FIGS. 8 to 9B, the second embodiment includes a main top plate 10, a support unit 20, a sub top plate 30, a lifting unit 40, and the like.

The second embodiment has a difference in the lifting unit 40 compared with the first embodiment, which will be described below.

The lifting unit 40 is composed of a first rail member 41, a second rail member 43, and a link member 46, which is the same as the first embodiment.

A locking jaw 45 is formed in at least one of the first guide groove 42 formed in the first rail member 41 or the second guide groove 44 formed in the second rail member 43.

In this embodiment, the locking jaw 45 is formed in both the first guide groove 42 and the second guide groove 44.

When the sub upper plate 30 is elevated, one end of the first link 47 and / or the other end of the second link 48 is caught by the locking jaw 45 and the link member 46 and the sub upper plate 30. ) To prevent it from descending.

At this time, unlike the first embodiment, the center of gravity acting on the sub-top plate 30 does not need to be located ahead of the other end of the second link 48.

In the same structure as in the second embodiment, the height of the sub-top plate 30 may be variously adjusted by the locking jaw 45.

Meanwhile, as illustrated in FIG. 10, the lifting unit 40 interconnects one end of the pair of first links 47 or interconnects the other end of the pair of second links 48. The locking shaft 49 may be further included.

The locking shaft 49 is disposed across the pair of the first guide grooves 42 or the pair of the second guide grooves 44, and the locking shaft 49 when the sub-top plate 30 is elevated. ) Is caught by the locking jaw 45 to prevent the link member 46 and the sub-top plate 30 from falling.

Other matters are the same as in the first embodiment, detailed description thereof will be omitted.

Third embodiment

11A and 11B are structural diagrams illustrating a structure in which a length of a link member is variable in a desk according to a third embodiment of the present invention.

As shown in FIGS. 11A and 11B, the third embodiment includes a main top plate 10, a support unit 20, a sub top plate 30, a lifting unit 40, and the like.

The third embodiment has a difference in the lifting unit 40 compared with the first embodiment, and will be described with reference to this.

The lifting unit 40 is composed of a first rail member 41, a second rail member 43, and a link member 46, which is the same as the first embodiment.

The length of the first link 47 and / or the second link 48 constituting the link member 46 may vary.

That is, the first link 47 and / or the second link 48 are connected to a plurality of pipes, and their lengths are varied by drawing out, thereby raising the sub-top plate 30 as shown in FIGS. 11A and 11B. You can adjust the angle of).

By adjusting the length of the first link 47 and / or the second link 48, the angle of the elevated sub-top plate 30 is inclined forward, so that the books placed on the sub-top plate 30 are inclined. By doing so, the user can better view the book placed on the sub-top plate 30.

Regarding a structure in which the lengths of the first link 47 and / or the second link 48 are variable, in the present embodiment, the first link 47 and / or the second link 48 may be formed of a plurality of pipes. The length of the first link 47 and / or the second link 48 may be varied through various known structures and methods. have.

The locking jaw 45 of the second embodiment may be applied to the first guide groove 42 and the second guide groove 44.

Other matters are similar to those of the first embodiment or the second embodiment described above, and detailed descriptions thereof will be omitted.

The inventors' sitting and sitting common desks are not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

The present invention can be applied to and used in standing and left desks.

Claims (15)

A main upper plate provided with an upper surface and a lower surface, the recessed grooves being recessed in an upward direction on a portion of the upper surface; A support for supporting the main top plate in an upward direction; A sub-top plate having a size smaller than that of the main top plate so as to be independently liftable in an up and down direction with respect to the main top plate, and inserted into the seating groove when descending; One end is coupled to the main top plate and the other end is coupled to the sub top plate, the lifting portion for lifting the sub top plate in the vertical direction with respect to the main top plate; The lower portion of the seating groove is blocked by the receiving portion formed in the main top plate, When the sub-top plate descends, the accommodating part is disposed under the sub-top plate, The elevating part is disposed inside the seating groove so that the upper end is higher than the upper surface of the main upper plate when the sub upper plate is raised. When the sub top plate descends, the top surface of the sub top plate and the top surface of the main top plate have the same height, The upper desk of the sub-top when the sub-top is raised, the sitting and sitting common desk, characterized in that disposed in a position higher than the upper surface of the main top. The method according to claim 1, The upper and lower surfaces of the main top plate are formed in a flat plate shape, The receiving and blocking seats of the seating recess are formed integrally on the main top plate, the sitting and sitting common desk. The method according to claim 1, The sitting and sitting common desk of claim 2, wherein at least two of the side surfaces of the sub upper plate face the inner surface of the seating groove while the sub top plate is inserted into the seating groove. The method according to claim 3, The sub top plate is formed in a square flat plate shape, The seating groove is formed in a rectangular shape corresponding to the sub-top plate, The seating groove is one of the four inner surface is opened in the horizontal direction to form an opening, Three of the four side surfaces of the sub-top face the three inner surfaces of the seating groove, The other one side of the sub-top is exposed to the outside through the opening portion of the sitting and sitting common desk. The method according to claim 1, A standing and sitting common desk, further comprising a cover plate covering an upper portion of the seating groove at a lower portion of the sub upper plate when the sub upper plate is raised. The method according to claim 5, The cover plate is pulled out from the main top plate and the sitting and sitting common desk, characterized in that covering the upper portion of the seating groove. The method according to claim 1, The sub-top is a standing and sitting common desk, characterized in that the area of the upper surface is variable in the raised state. The method according to claim 7, The sub top plate, A lift plate to which the other end of the lift unit is coupled; A standing and sitting common desk, characterized in that consisting of a wing plate for varying the area of the sub-top plate is rotatably coupled to the lifting plate or sliding withdrawable. The method according to claim 1, The lifting unit, A pair of first rail members coupled to an inner side surface of the seating groove; A pair of second rail members coupled to side surfaces of the sub-top plate; It includes a pair of link members, the height of which is adjusted by sliding along the first rail member and the second rail member during the lifting of the sub-top plate, When the sub upper plate is lowered, the lifting unit is accommodated in the seating groove between the main upper plate and the sub upper plate, Standing and sitting common desk, characterized in that the height of the sub-top plate is variable by adjusting the height of the link member. The method according to claim 9, The first rail member has a long guide-shaped first guide groove is formed long in the front and rear directions, The second rail member has a long guide-shaped second guide groove is formed long in the front and rear directions, The link member, A first link having one end slidably coupled to the first guide groove and the other end rotatably coupled to the side surface of the sub upper plate or the second rail member; One end is rotatably coupled to the inner surface of the seating groove or the first rail member and the other end is composed of a second link slidably coupled to the second guide groove, The first link and the second link is a standing and sitting common desk, characterized in that the center crosses each other in the 'X' shape. The method according to claim 10, The first link and the second link is a sitting and sitting common desk, characterized in that the central portion is rotatably constrained. The method according to claim 10, The first guide groove is located in front of one end of the second link, The second guide groove is located in front of the other end of the first link, The weight center point acting on the sub upper plate when the sub upper plate is lifted up is located ahead of the other end of the second link inserted into the second guide groove, thereby preventing the sub upper plate from falling. And sitting public desks. The method according to claim 10, At least one of the first guide groove or the second guide groove is formed with a locking jaw, And one end of the first link or the other end of the second link is caught by the locking jaw to prevent the link member and the sub-top from being lowered when the sub-top is lifted. The method according to claim 13, The lifting unit, It further comprises a locking shaft for interconnecting one end of the pair of first links, or the other end of the pair of second links, The locking shaft is disposed across a pair of the first guide groove or a pair of the second guide groove, When the sub-top of the sub-elevation, the engaging shaft is caught in the locking jaw, characterized in that stopping the fall of the link member and the sub-top plate. The method according to claim 10, A standing and sitting common desk, characterized in that the length of the first link or the second link is variable.

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