Top plate lift type furniture

Abstract

To provide a top plate lift type desk 1 which can secure a front space below a top plate 2 while enhancing bending flexibility of the top plate.SOLUTION: A top plate lift type desk 1 has a top plate 2, a pair of lift legs 10a, and a coupling member 40. The top plate 2 has a work surface. The pair of lift legs 10a support the top plate 2 so that its vertical position can be varied. The coupling member 40 directly or indirectly couples the pair of lift legs 10a. The pair of lift legs 10a each have: a lower arm grounded on a floor surface; and a lift mechanism 10 having a stretchable part which stretches and shrinks in the vertical direction. The lift mechanisms 10 included in the pair of lift legs 10a are arranged on the center part of the top plate 2 in a cross direction. The coupling member 40 is arranged on a rear side relative to a virtual line L connecting front ends of the lift mechanism 10 included in the pair of the lift legs 10a, in the cross direction of the top plate 2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a furniture unit with a liftable top. [Background technology]

[0002] Conventionally, in offices and public facilities, furniture with tabletops, such as desks and tables, are used. The height of the tabletop that is easy to work at varies from person to person depending on the posture, physique, sex, and preferences of the user. Furniture with a fixed tabletop height cannot accommodate such situations, so tabletop lifting furniture that can change the height of the tabletop in the vertical direction is widely used. As a method for changing the height of the tabletop in the vertical direction, the use of gas springs and gears has been proposed. However, these methods have the problem that it may be difficult for users with weak strength to operate them. In view of such problems, in order to improve the operability of the lifting means, many tabletop lifting furniture using an electric drive unit that can automatically change the height of the tabletop up and down is adopted. With this method, the user can change the height of the tabletop with a simple operation.

[0003] Such a tabletop lifting fixture generally supports the tabletop with a pair of lifting legs located at the left and right ends and a connecting member that connects the pair of lifting legs. The connecting member is preferably located toward the rear in the front-to-rear direction of the tabletop so that it does not hit the knees of a user in a seated position or a chair or the like stored under the tabletop when used in a standing position as the tabletop is repeatedly raised and lowered. Accordingly, the pair of lifting legs connected by the connecting member is generally also located toward the rear in the front-to-rear direction of the tabletop. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6627140 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of lifting legs arranged toward the rear of the tabletop, a cantilever structure is used to support the tabletop, and there is room for improvement in terms of the bending rigidity of the tabletop. On the other hand, if the legs are positioned in the center of the tabletop from front to back in order to support the tabletop in a balanced manner, the connecting member is positioned forward accordingly. Therefore, the connecting member hits the knees of the user in the aforementioned sitting position, or a chair or the like stored under the tabletop when used in a standing position, making it impossible to secure space in front of the tabletop.

[0006] The present invention aims to provide a furniture unit with a liftable top that can increase the flexural rigidity of the top while ensuring space in front of and below the top. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. The lifting tabletop fixture of the first aspect of the present invention comprises a tabletop, a pair of lifting legs, and a connecting member. The tabletop has a work surface. The pair of lifting legs support the tabletop so that the up and down position can be changed. The connecting member directly or indirectly connects the pair of lifting legs. The pair of lifting legs have a grounding portion that contacts the floor surface and a lifting mechanism having an expansion and contraction portion that expands and contracts in the up and down direction. The lifting mechanism of the pair of lifting legs is disposed in the center of the tabletop in the front-to-rear direction. The connecting member is disposed behind an imaginary line L that connects the front ends of the lifting mechanisms of the pair of lifting legs in the front-to-rear direction of the tabletop.

[0008] The lifting mechanism of the pair of lifting legs is disposed in the center of the tabletop in the front-rear direction. This shortens the distance from the front end of the tabletop to the lifting mechanism, and increases the flexural rigidity of the tabletop. The connecting member is disposed behind the imaginary line L connecting the front ends of the lifting mechanisms of the pair of lifting legs. This lengthens the distance from the front end of the tabletop to the connecting member. Therefore, even when the tabletop is lowered, the connecting member is unlikely to interfere with the lower legs of the user or a chair accommodated below the tabletop. Therefore, it is possible to secure a space in front of the tabletop while increasing the flexural rigidity of the tabletop.

[0009] In a second aspect of the present invention, in the lifting tabletop fixture described in the first aspect, a control unit that controls the lifting and lowering operation of the pair of lifting legs is provided behind the connecting member in the front-to-rear direction of the tabletop. This increases the distance from the front end of the tabletop to the control unit, so that even when the tabletop is lowered, the control unit is less likely to interfere with the user's legs or a chair placed below the tabletop. This makes it possible to secure a space in front of the tabletop while increasing the tabletop's flexural rigidity.

[0010] In a third aspect of the present invention, in the liftable tabletop fixture according to the first or second aspect, a tray capable of accommodating articles is provided behind the connecting member in the front-to-rear direction of the tabletop. This increases the distance from the front edge of the tabletop to the tray in the front-rear direction, ensuring space in front of the tabletop and making it less likely that the tray will interfere with the user's legs or a chair placed below the tabletop, even when the tabletop is lowered.

[0011] In a fourth aspect of the present invention, in the tabletop lifting fixture according to any one of the first to third aspects, the lifting mechanism has a drive unit disposed above the extension section and extending and retracting the extension section in the up-down direction. The drive unit has a wiring socket on the inside in the left-right direction of the tabletop. The connecting member connects the drive units of the pair of lifting legs. Inside the drive units of the pair of lifting legs in the left-right direction of the tabletop, and in front of the connecting member in the front-to-rear direction of the tabletop, there is an open space that is open forward and downward. The wiring socket is connected to the open space. Since the wiring socket is connected to an open space, wiring and maintenance work for the drive unit is easy.

[0012] In a fifth aspect of the present invention, in the lifting tabletop fixture according to the fourth aspect, the connecting member has a wiring insertion space through which wiring can be inserted. The wiring inlet communicates with the wiring insertion space. This facilitates the wiring work of passing the wires extending from the drive unit through the wire insertion space.

[0013] A sixth aspect of the present invention relates to a liftable tabletop fixture according to the fourth aspect, which has a removable unit cover that conceals the wiring socket of the drive unit. This makes it look good as the wiring socket is not exposed. Also, the unit cover can be removed when wiring, which improves workability.

[0014] In a seventh aspect of the present invention, in the lifting table fixture according to the sixth aspect, the unit cover has a front portion that covers the front of the drive unit in the front-to-rear direction of the table, and an inner portion that covers the inside of the drive unit in the left-to-right direction of the table. The inner portion slopes inward in the left-to-right direction of the table from the rear in the front-to-rear direction of the table. This makes the angle between the front portion and the inner portion an obtuse angle, so that even if an item stored below the top plate comes into contact with the unit cover when the top plate is lowered, the impact can be mitigated. Effect of the Invention

[0015] According to the liftable tabletop fixture of the present invention, it is possible to increase the bending rigidity of the tabletop while still ensuring space in front of and below the tabletop. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is an oblique view from above of the desk with a height adjustable top according to the embodiment. [Diagram 2] FIG. 2 is a side view of the height-adjustable desk. [Diagram 3]FIG. 2 is a bottom view of the height-adjustable desk. [Figure 4] 4 is an explanatory diagram of an upper arm, a lifting leg, and a connecting member. FIG. [Diagram 5] FIG. 4 is a perspective view of a portion indicated by an arrow V in FIG. [Figure 6] FIG. [Figure 7] 11A and 11B are explanatory diagrams of an upper arm, a lifting leg, and a connecting member in a first modified example of the embodiment. [Figure 8] FIG. 11 is an explanatory diagram of a desk with a height adjustable top in a second modified example of the embodiment. [Figure 9] FIG. 11 is a bottom view of a desk with a height adjustable top in a third modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of a liftable tabletop display unit will be described with reference to the drawings. Fig. 1 is a perspective view from above of a desk 1 with a liftable top according to an embodiment. Fig. 2 is a side view of the desk 1. Fig. 3 is a bottom view of the desk 1. The furniture with a liftable top according to an embodiment is, for example, the desk 1 with a liftable top.

[0018] In this application, the Z direction, X direction, and Y direction of the Cartesian coordinate system are defined as follows. The Z direction is the up-down direction of the desk 1 with adjustable top. The +Z direction is upward, and the -Z direction is downward. The X direction is the front-to-back direction of the desk 1 with adjustable top. The +X direction is backward, and the -X direction is forward. The Y direction is the left-to-right direction of the desk 1 with adjustable top. The direction approaching the center of the desk 1 in the left-to-right direction is the inner left-to-right direction, and the direction moving away from the center in the left-to-right direction is the outer left-to-right direction.

[0019] The desk 1 includes a tabletop 2, a lifting leg 10a, a connecting member 40 (see FIG. 3), and an upper arm 4. The top board 2 is a flat plate parallel to the XY plane. The top board 2 is rectangular in plan view. The length direction of the short side is the front-rear direction, and the length direction of the long side is the left-right direction. The thickness of the top board 2 in the up-down direction is thin. The upper surface of the top board 2 is the work surface.

[0020] The upper arm 4 is fixed to the underside of the tabletop 2. The upper arm 4 extends in the front-rear direction. The length of the upper arm 4 in the front-rear direction is slightly shorter than the length of the tabletop 2 in the front-rear direction. A pair of upper arms 4 are disposed at both ends of the tabletop 2 in the left-right direction.

[0021] The lifting leg 10a is disposed below the upper arm 4. The lifting leg 10a has a lifting mechanism 10 and a lower arm 8. The lifting mechanism 10 extends in the vertical direction. The upper end of the lifting mechanism 10 is fixed to the upper arm 4. The lifting mechanism 10 is disposed in the center of the tabletop 2 in the front-to-rear direction. The width of the lifting mechanism 10 in the front-to-rear direction is small. A pair of lifting mechanisms 10 are disposed at both ends of the tabletop 2 in the left-to-right direction.

[0022] 3, the connecting member 40 connects the pair of lifting legs 10a. Both left and right ends of the connecting member 40 are fixed to the upper ends of the pair of lifting mechanisms 10. The connecting member 40 is also fixed to the underside of the tabletop 2. The connecting member 40 assists the synchronous lifting and lowering operations of the pair of lifting mechanisms 10. The upper arm 4, the lifting mechanisms 10 and the connecting member 40 will be described in detail later.

[0023] The lower arm 8 (ground contact portion) is disposed below the lifting mechanism 10. The lower arm 8 is in contact with the floor surface. The lower arm 8 extends in the front-to-rear direction. A central portion of the lower arm 8 in the front-to-rear direction is fixed to a lower end portion of the lifting mechanism 10. A pair of lower arms 8 are disposed at both ends of the tabletop 2 in the left-to-right direction.

[0024] The tabletop 2 is supported by the upper arm 4, the lifting legs 10a, and the connecting member 40. The lifting mechanism 10 of the lifting legs 10a extends and retracts in the vertical direction, allowing the tabletop 2 to be raised and lowered in the vertical direction. This allows the user to select the height of the tabletop 2 that is easy to work at, depending on their posture, physique, sex, preferences, etc. As the lifting mechanism 10 is disposed in the center of the tabletop 2 in the front-to-rear direction, the distance from the front end of the tabletop 2 to the lifting mechanism 10 is shortened. This increases the flexural rigidity of the tabletop 2.

[0025] Fig. 4 is an explanatory diagram of the upper arm 4, the lifting legs 10a, and the connecting member 40. In Fig. 4, the unit cover 15, the tray 30 (see Fig. 3), etc. are omitted. The upper arm 4 has a pair of mounting brackets 6. The outer ends of the mounting brackets 6 in the left-right direction are fixed to the upper arm 4 by welding or the like. The shape of the mounting bracket 6 in a cross section perpendicular to the left-right direction is L-shaped. The mounting bracket 6 has a first plate portion 6p parallel to the rear surface of the tabletop 2, and a second plate portion 6v perpendicular to the rear surface of the tabletop 2. The first plate portion 6p is fixed to the tabletop 2 by a bolt or the like. The second plate portion 6v is parallel to the YZ plane. The second plate portions 6v of the pair of mounting brackets 6 are arranged at an interval in the front-rear direction.

[0026] The lifting mechanism 10 of the lifting leg 10a has an extension section 12 and a drive unit 14. The telescopic section 12 has multiple (three in this embodiment) square tubes. The multiple square tubes are arranged coaxially with respect to a central axis that is parallel to the vertical direction. The lower end of the outermost square tube is connected to the lower arm 8 (see FIG. 1). The upper end of the innermost square tube is connected to the drive unit 14. The multiple square tubes move relative to each other in the vertical direction, causing the telescopic section 12 to telescope in the vertical direction.

[0027] The drive unit 14 extends and retracts the telescopic section 12 in the up-down direction. An electric motor and the like are disposed inside the drive unit 14. The drive unit 14 is in the shape of a substantially rectangular box. The drive unit 14 is disposed above the telescopic section 12. The upper end of the telescopic section 12 is connected to the outer end in the left-right direction of the lower surface of the drive unit 14. The width of the drive unit 14 in the front-rear direction is slightly wider than the width of the telescopic section 12 in the front-rear direction. As described above, the second plate portions 6v of the pair of mounting brackets 6 of the upper arm 4 are disposed at a distance in the front-rear direction. The drive unit 14 is disposed between the second plate portions 6v of the pair of mounting brackets 6. As shown in FIG. 3, the front and inner sides in the left-right direction of the drive unit 14 are covered by a removable unit cover 15.

[0028] Fig. 5 is a perspective view of a portion indicated by an arrow V in Fig. 3. In Fig. 5, the unit cover 15 is omitted. The drive unit 14 has a socket (wiring socket) 16 into which a connector for electrical wiring is plugged. The socket 16 is disposed near the upper end of the inner surface of the drive unit 14 in the left-right direction. The cross section of the connecting member 40 perpendicular to the left-right direction has a J-shape. The connecting member 40 has a first plate portion 40p, a second plate portion 40v, and a groove portion 40g.

[0029] The first plate portion 40p is disposed above the connecting member 40. The first plate portion 40p is parallel to the rear surface of the top plate 2. The first plate portion 40p is fixed to the top plate 2 by bolts or the like. The second plate portion 40v extends downward from the first plate portion 40p. The second plate portion 40v is perpendicular to the rear surface of the top plate 2. The second plate portion 40v is disposed behind the connecting member 40.

[0030] The groove portion 40g extends forward from the lower end of the second plate portion 40v and then extends upward. The groove portion 40g opens upward. The groove portion 40g is disposed downward and away from the top plate 2. The groove portion 40g and the connecting member 40 open forward. The inside of the groove portion 40g is a wiring insertion space 42 through which various wirings (cables) can be inserted. The opening of the groove portion 40g is an opening portion 43 that communicates between the wiring insertion space 42 and the external space of the connecting member 40. The groove portion 40g is disposed between the pair of drive units 14 in the left-right direction.

[0031] As shown in FIG. 4, the second plate portion 40v extends outward in the left-right direction beyond the groove portion 40g. Of the pair of mounting brackets 6 of the upper arm 4, the one disposed at the rear is the rear mounting bracket 6a. The left-right end of the second plate portion 40v of the connecting member 40 is disposed behind the second plate portion 6v of the rear mounting bracket 6a. The second plate portion 40v of the connecting member 40, the second plate portion 6v of the rear mounting bracket 6a, and the drive unit 14 are fastened together by bolts or the like. This allows the connecting member 40 to be firmly fixed to the upper arm 4 and the drive unit 14 of the lifting leg 10a. The connecting member 40 is directly connected to the lifting mechanism 10 of the pair of lifting legs 10a by bolts or the like. The connecting member 40 directly connects the drive units 14 of the pair of lifting legs 10a.

[0032] As shown in Fig. 3, an imaginary line L is assumed to connect the front ends of the lifting mechanism 10 of a pair of lifting legs 10a. The connecting member 40 is disposed rearward of the imaginary line L. This increases the front-rear distance from the front end of the tabletop 2 to the connecting member 40. Therefore, even when the tabletop 2 is lowered, the connecting member 40 is unlikely to interfere with the lower legs of a user or a chair stored below the tabletop 2. This makes it possible to ensure a space in front of the tabletop.

[0033] 6 is an explanatory diagram of the cable arrangement. In FIG. 6, only the outline of the tabletop 2 is shown, and the illustration of the lifting legs 10a etc. is omitted. The desk 1 with a lifting tabletop has an operation switch 22 and a control unit 20.

[0034] The operation switch 22 is a switch that is operated by the user to raise and lower the tabletop 2. The operation switch 22 is fixed to the underside of the tabletop 2. The operation switch 22 is located in front of the tabletop 2, near one of the ends in the left-right direction.

[0035] The control unit 20 controls the operation of the drive unit 14, thereby controlling the lifting and lowering operation of the pair of lifting mechanisms 10. The control unit 20 is disposed below the tabletop 2. The control unit 20 is disposed in the center in the left-right direction, behind the connecting member 40. This increases the distance in the front-rear direction from the front end of the tabletop 2 to the control unit 20. Therefore, even when the tabletop 2 is lowered, the control unit 20 is less likely to interfere with the lower legs of the user or a chair stored below the tabletop 2.

[0036] As shown in Fig. 5, a support bracket 26 that supports a power tap is disposed behind the control unit 20. The support bracket 26 is fixed to the top board 2. The support bracket 26 and the coupling member 40 are connected by a connection member 27. The control unit 20 is disposed above the connection member 27 and is supported by the connection member 27. As shown in Fig. 6, a power cable 20c extending from the control unit 20 is connected to a commercial power source.

[0037] The cable 22c of the operation switch 22 extends rearward from the operation switch 22. The cable 22c enters the wiring insertion space 42 from the front open portion 43 of the connecting member 40. The cable 22c extends inward in the left-right direction along the wiring insertion space 42. The second plate portion 40v of the connecting member 40 has a through hole 40h in the center in the left-right direction. The through hole 40h penetrates the second plate portion 40v in the front-rear direction. The cable 22c passes through the through hole 40h and extends rearward of the connecting member 40. The cable 22c is connected to the control unit 20.

[0038] A cable 14c of the drive unit 14 extends from the control unit 20. A pair of cables 14c extends corresponding to the drive units 14 of the pair of lifting mechanisms 10. The cable 14c passes through the through hole 40h of the connecting member 40 and enters the wire insertion space 42. The cable 14c extends outward in the left-right direction along the wire insertion space 42. Connectors at the ends of the pair of cables 14c are connected to the sockets 16 of the corresponding drive units 14.

[0039] When a user operates the operation switch 22, the operation switch 22 transmits an operation signal corresponding to the operation content to the control unit 20. The control unit 20 transmits a drive signal corresponding to the operation signal to the drive unit 14. The drive unit 14 extends and retracts the extension / contraction section 12 in response to the drive signal. As a result, the tabletop 2 moves up and down according to the operation of the user.

[0040] An open space S (a step space between the connecting member 40 and the driving unit 14) is formed inside the driving unit 14 of a pair of lifting legs 10a in the left-right direction of the tabletop 2 and in front of the connecting member 40. The open space S is open forward and downward. The socket 16 of the driving unit 14 communicates with the open space S via the opening 43 of the connecting member 40. This allows the socket 16 to be accessed from the open space S, making it easy to wire the cable 14c and perform maintenance work. The socket 16 also communicates with the wiring insertion space 42 of the connecting member 40. This makes it easy to wire the cable 14c extending from the driving unit 14 through the wiring insertion space 42.

[0041] As shown in Fig. 3, the unit cover 15 conceals the socket 16 of the drive unit 14. This improves appearance since the socket 16 is not exposed to the open space S. In addition, the unit cover 15 is removable. By removing the unit cover 15, the socket 16 is exposed to the open space S. This makes it easy to wire the cable 14c.

[0042] As shown in Fig. 5, the desk 1 with a liftable top has a tray 30 on which an item can be placed. The tray 30 is disposed below the top 2 and fixed to the top 2. A pair of trays 30 are disposed on both left and right sides of the control unit 20 (see Fig. 3). As described above, a support bracket 26 that supports a power tap (not shown) is disposed behind the control unit 20. For example, various power wiring connected to this power tap is placed on the tray 30.

[0043] The tray 30 is disposed behind the connecting member 40. This increases the distance in the front-rear direction from the front end of the tabletop 2 to the tray 30. This makes it possible to secure a space in front of the tabletop, and even when the tabletop 2 is lowered, the tray 30 is unlikely to interfere with the lower legs of a user or a chair stored below the tabletop 2.

[0044] As described above, the lifting mechanism 10 of the pair of lifting legs 10a is disposed in the center of the tabletop 2 in the front-rear direction. Therefore, the distance in the front-rear direction from the connecting member 40 to the rear end of the tabletop 2 is long. To increase the capacity of the tray 30, the tray 30 can be expanded rearward, and does not need to be expanded downward. As a result, even when the tabletop 2 is lowered, the tray 30 is less likely to interfere with the lower legs of the user or a chair stored below the tabletop 2.

[0045] As described above in detail, the desk 1 with a height-adjustable top plate of the embodiment includes the top plate 2, a pair of lifting legs 10a, and a connecting member 40. The top plate 2 has a work surface. The pair of lifting legs 10a support the top plate 2 so that the vertical position can be changed. The connecting member 40 directly or indirectly connects the pair of lifting legs 10a. The pair of lifting legs 10a includes a lower arm 8 that is in contact with the floor surface, and a lifting mechanism 10 having an expandable portion 12 that expands and contracts in the vertical direction. The lifting mechanism 10 of the pair of lifting legs 10a is disposed in the center of the top plate 2 in the front-rear direction. The connecting member 40 is disposed behind the imaginary line L that connects the front ends of the lifting mechanisms 10 of the pair of lifting legs 10a in the front-rear direction of the top plate 2.

[0046] The lifting mechanism 10 of the pair of lifting legs 10a is disposed in the center of the tabletop 2 in the front-rear direction. This shortens the distance from the front end of the tabletop 2 to the lifting mechanism 10, and increases the flexural rigidity of the tabletop 2. The connecting member 40 is disposed behind the imaginary line L connecting the front ends of the lifting mechanisms 10 of the pair of lifting legs 10a. This lengthens the distance from the front end of the tabletop 2 to the connecting member 40. Therefore, even when the tabletop 2 is lowered, the connecting member 40 is unlikely to interfere with the lower legs of the user or a chair accommodated below the tabletop 2. Therefore, it is possible to secure a space in front of the tabletop 2 while increasing the flexural rigidity of the tabletop 2.

[0047] A control unit 20 that controls the lifting and lowering operation of the pair of lifting legs 10a is provided behind the connecting member 40 in the front-rear direction of the tabletop 2. This increases the distance from the front end of the tabletop 2 to the control unit 20. Therefore, even when the tabletop 2 is lowered, the control unit 20 is less likely to interfere with the lower legs of the user or a chair stored below the tabletop 2. Therefore, it is possible to secure a space in front of the tabletop 2 while increasing the bending rigidity of the tabletop 2.

[0048] A tray 30 capable of accommodating articles is provided behind the connecting member 40 in the front-rear direction of the top board 2. This increases the distance in the front-rear direction from the front end of the tabletop 2 to the tray 30. This makes it possible to secure a space in front of the tabletop, and even when the tabletop 2 is lowered, the tray 30 is less likely to interfere with the lower legs of a user or a chair stored below the tabletop 2.

[0049] (First Modification) 7 is an explanatory diagram of an upper arm 4, lifting legs 10a, and connecting member 40 in a first modified example of the embodiment. The connecting member 40 in the first modified example is different from the embodiment in that it indirectly connects a pair of lifting legs 10a. A description of the first modified example regarding the points similar to the embodiment may be omitted.

[0050] The upper arm 4 of the first modified example has a base portion 7. The base portion 7 is located in the center in the front-rear direction of the upper arm 4. For example, the base portion 7 is formed by suspending a base metal fitting between a pair of mounting metal fittings 6.

[0051] The connecting member 40 is fixed to the base portion 7 of the upper arm 4. The drive unit 14 of the lifting legs 10a is fixed to the base portion 7 of the upper arm 4. As a result, the connecting member 40 is indirectly connected to the drive unit 14 of the lifting legs 10a via the base portion 7 of the upper arm 4. The connecting member 40 indirectly connects the pair of lifting legs 10a via the upper arm 4. The connecting member 40 may also indirectly connect the pair of lifting legs 10a via a member other than the upper arm 4. As in the above-described embodiment, the connecting member 40 of the first modified example assists the synchronous lifting and lowering operations of the pair of lifting mechanisms 10.

[0052] As in the above-described embodiment, the connecting member 40 in the first modified example is disposed behind the imaginary line L (see FIG. 3) connecting the front ends of the lifting mechanisms 10 of the pair of lifting legs 10a. This makes the distance from the front end of the tabletop 2 to the connecting member 40 longer, making it possible to secure space in front of the tabletop.

[0053] (Second Modification) 8 is an explanatory diagram of a desk 1 with a lifting top in a second modified example of the embodiment. The desk 1 with a lifting top in the second modified example differs from the embodiment in that the lifting mechanism 10 is covered by a cover member 50. A description of the second modified example that is similar to the embodiment may be omitted.

[0054] In the second modification, the multiple square tubes constituting the expandable section 12 of the lifting mechanism 10 are each covered with a cover member 50. The multiple cover members 50 move relatively in the up and down direction together with the multiple square tubes. In general, the expandable section 12 of the lifting mechanism 10 is made of a metal material or the like. In contrast, the cover member 50 is made of, for example, wood, resin material, or metal material. The cover member 50 changes the design of the desk 1 with a liftable top.

[0055] As in the above-described embodiment, the connecting member 40 in the second modified example is disposed behind the imaginary line L (see FIG. 3) connecting the front ends of the lifting mechanisms 10 of the pair of lifting legs 10a. The imaginary line L is a line connecting the front ends of the pair of lifting mechanisms 10 disposed inside the cover member 50. This increases the distance from the front end of the tabletop 2 to the connecting member 40, making it possible to ensure space in front of the tabletop.

[0056] (Third Modification) 9 is a bottom view of the desk 1 with a liftable top in a third modified example of the embodiment. In the desk 1 with a liftable top in the third modified example, the shape of the unit cover 15 is different from that in the embodiment. A description of the second modified example that is similar to the embodiment may be omitted.

[0057] The unit cover 15 of the third modified example has a front portion 15a that covers the front of the drive unit 14, and an inner portion 15b that covers the inside of the drive unit 14 in the left-right direction. The inner portion 15b is inclined inward in the left-right direction toward the rear. This makes the angle between the front portion 15a and the inner portion 15b of the unit cover 15 an obtuse angle. When the tabletop 2 is lowered, the user's lower legs or items stored below the tabletop 2 may come into contact with the unit cover 15. Even in this case, since the corners of the unit cover 15 are obtuse angles, the impact caused by the contact can be mitigated compared to when the corners are right angles.

[0058] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not deviate from the gist of the present invention are also included. [Explanation of symbols]

[0059] L…Virtual line S...Open space 1. Height-adjustable desk (height-adjustable display unit) 2…Tabletop 8…Lower arm (ground contact part) 10...Lifting mechanism 10a…Lifting leg 12...Extendable part 14…Drive unit 15...Unit cover 16…Socket (wiring socket) 20…Control unit 30…Tray 40...Connecting member 42…Wiring insertion space

Claims

1. A top plate having a work surface; A pair of lifting legs that support the top plate so that the top plate can be moved up and down; A connecting member that directly or indirectly connects the pair of lifting legs, The pair of lifting legs each have a grounding portion that contacts a floor surface and a lifting mechanism having an extension portion that extends and contracts in the vertical direction, The lifting mechanism of the pair of lifting legs is disposed at a center portion of the tabletop in a front-rear direction, The connecting member is disposed rearward of an imaginary line connecting front ends of the lifting mechanisms of the pair of lifting legs in the front-rear direction of the tabletop. Display rack with liftable top.

2. A control unit for controlling the lifting and lowering operation of the pair of lifting legs is provided behind the connecting member in the front-rear direction of the tabletop. A liftable display fixture as claimed in claim 1.

3. A tray capable of accommodating items is provided behind the connecting member in the front-rear direction of the top plate. A display unit with a liftable top as described in claim 1 or 2.

4. The lifting mechanism has a drive unit disposed above the extension / contraction section to extend and contract the extension / contraction section in the up-down direction, The drive unit has a wiring insertion port on the inside of the top plate in the left-right direction, the connecting member connects the drive units of the pair of lifting legs, an open space that is open forward and downward and is located inside the drive units of the pair of lifting legs in the left-right direction of the tabletop and in front of the connecting member in the front-rear direction of the tabletop, The wiring socket is in communication with the open space. A display unit with a liftable top as described in claim 1 or 2.

5. The connecting member has a wiring insertion space therein through which a wiring can be inserted, The wiring insertion port communicates with the wiring insertion space. A liftable display fixture as described in claim 4.

6. A removable unit cover is provided to conceal the wiring insertion port of the drive unit. A liftable display fixture as described in claim 4.

7. the unit cover has a front portion that covers a front of the drive unit in a front-rear direction of the tabletop, and an inner portion that covers an inner side of the drive unit in a left-right direction of the tabletop, The inner portion is inclined inward in the left-right direction of the tabletop toward the rear in the front-rear direction of the tabletop. A liftable display fixture as described in claim 6.

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