Top board elevation type furniture

Abstract

To provide a top board elevation type desk capable of reducing a user's physical burden while reducing weight of a top board 50.SOLUTION: A top board elevation type desk has a top board 50 and a leg body. The top board 50 has a work surface on a top surface. The leg body supports the top board 50 so that it can elevate vertically. The top board 50 has: a body area 53 supporting a lower end part with the leg body; and a front edge area 54 connected to the front of the body area 53. On an upper side of the front edge area 54, an upper inclined part 55 inclined downward is formed forward. A lower end part 54z of the front edge area 54 is disposed below a lower end part 53z of the body area 53.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Offices and public facilities have traditionally used tabletop fixtures, such as desks and tables, which are equipped with tabletops that can be used for various tasks. The height of the tabletop that is most comfortable for each user varies depending on the user's posture, physique, gender, and preferences. Since tabletop fixtures with a fixed tabletop height cannot accommodate this situation, adjustable tabletop fixtures, which allow the tabletop to be adjusted vertically, are widely used.

[0003] When working standing up for long periods of time on such lift-top fixtures, users often lean forward and lean against the front edge of the tabletop. This places a large force on the user's body as they lean against the front edge of the tabletop, causing the front edge of the tabletop to dig into their body. To prevent this digging in, the front edge of the tabletop may be designed to slope downward as it approaches the front.

[0004] On the other hand, as a method for changing the height of the tabletop of a tabletop-lifting fixture in the vertical direction, a configuration using a gas spring or a configuration using gears has been proposed. A configuration using an electric drive unit that can automatically change the height of the tabletop in the vertical direction has also been proposed. To reduce the mechanical burden on the electric drive unit that supports and raises and lowers the tabletop, there is a demand for a thinner tabletop to make it lighter. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6600880 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the front end of a thin tabletop is inclined, the area that comes into contact with the user's body leaning against the front end of the tabletop becomes smaller, which poses a problem of compromising the effect of preventing digging in.

[0007] The present invention aims to provide a furniture unit with a liftable tabletop that can reduce the physical burden on the user while reducing the weight of the tabletop. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention proposes the following means. The liftable tabletop fixture of aspect 1 of the present invention has a tabletop and legs. The tabletop has a work surface on its upper surface. The legs support the tabletop so that it can be raised and lowered in the vertical direction. The tabletop has a main body area whose lower end is supported by the legs, and a front edge area connected to the front of the main body area. An upper inclined portion that slopes downward toward the front is formed above the front edge area. The lower end of the front edge area is disposed below the lower end of the main body area.

[0009] This reduces the thickness of the main body area and makes the tabletop lighter. Meanwhile, the thickness of the front edge area increases, increasing the surface area of ​​the front end of the tabletop. This reduces the amount of pressure the front end of the tabletop exerts on the user's body. Therefore, the tabletop can be made lighter while still reducing the physical strain on the user.

[0010] In a second aspect of the present invention, in the liftable tabletop fixture according to the first aspect, the vertical height of the upper inclined portion is equal to or greater than the vertical height of the main body area. This increases the surface area of ​​the upper inclined portion, thereby reducing the physical burden on the user who comes into contact with the upper inclined portion.

[0011] In a third aspect of the present invention, in the lifting table fixture described in the first or second aspect, the upper inclined portion has a first inclined portion and a second inclined portion. The first inclined portion is continuous with the main body area and is disposed in front of the main body area, and is inclined by a curved surface with a first radius of curvature. The second inclined portion is disposed between the first inclined portion and the front end of the leading edge area, and is inclined by a curved surface with a second radius of curvature smaller than the first radius of curvature. The length of the first inclined portion in the front-to-back direction is between three and five times the height of the first inclined portion in the up-to-down direction. This makes the inclination of the first inclined portion gentler and conforms to the angle of the user's body part that abuts against the first inclined portion, thereby reducing the physical burden on the user.

[0012] In aspect 4 of the present invention, in the lifting tabletop fixture described in any one of aspects 1 to 3, there is a lower inclined portion on the lower side of the front edge area that curves from the upper inclined portion and slopes downward toward the rear. This prevents corners from being formed in the front edge area, which prevents the front end of the table top from digging into the user's body and reduces the physical strain on the user.

[0013] In a fifth aspect of the present invention, in the liftable tabletop fixture according to any one of the first to fourth aspects, a side cover member is provided on the side of the tabletop. The lower end of the side cover member is positioned at approximately the same position in the vertical direction as the lower end of the front edge area. The side cover members conceal the step between the bottom edge of the front edge area and the bottom edge of the main body area, giving the height-adjustable desk a unified appearance and improving its aesthetic appeal. [Effects of the Invention]

[0014] According to the liftable tabletop fixture of the present invention, it is possible to reduce the weight of the tabletop while also reducing the physical burden on the user. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the height-adjustable desk from above according to the embodiment. [Figure 2] FIG. 2 is a side view of the height-adjustable desk. [Figure 3] 1 is a side cross-sectional view of a height-adjustable desk according to a first embodiment. [Figure 4] FIG. 2 is a side cross-sectional view of the front end portion of the top plate body. [Figure 5] FIG. 10 is a side cross-sectional view of a height-adjustable desk according to a second embodiment. [Figure 6] FIG. 2 is a side cross-sectional view of the front end portion of the top plate body. [Figure 7] FIG. 2 is a side view of the front end portion of the tabletop body. [Figure 8] FIG. 10 is a perspective view of the lift-top desk in the third embodiment, seen from below. [Figure 9] FIG. 9 is an exploded perspective view of FIG. 8. [Figure 10] FIG. 9 is a cross-sectional view taken along the line X in FIG. 8. [Figure 11] FIG. 10 is an exploded perspective view of the desk with a height-adjustable top in the fourth embodiment. [Figure 12] FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. [Figure 13] FIG. 10 is an explanatory diagram of a first modified example of the fourth embodiment. [Figure 14] FIG. 10 is an explanatory diagram of a second modified example of the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of a liftable tabletop fixture will be described with reference to the drawings. 1 is a perspective view from above of a desk 1 with a height adjustable top according to an embodiment. In FIG. 1, only the outline of a desk top 50 is shown by a two-dot chain line. The furniture with a height adjustable top according to the embodiment is, for example, the desk 1 with a height adjustable top.

[0017] 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 height-adjustable desk 1. The +Z direction is upward, and the -Z direction is downward. The X direction is the front-to-back direction of the height-adjustable desk 1. The +X direction is backward, and the -X direction is forward. The Y direction is the left-to-right direction of the height-adjustable desk 1. The direction approaching the center of the height-adjustable desk 1 in the left-to-right direction is the inner side in the left-to-right direction, and the direction moving away from the center in the left-to-right direction is the outer side in the left-to-right direction.

[0018] The desk 1 with a height-adjustable top includes a top 50, lifting legs 10, a connecting member 40, an upper arm 4, and a lower arm 8. The tabletop 50 is a flat plate parallel to the XY plane. The tabletop 50 is rectangular in plan view. The length direction of the short sides of the tabletop 50 is the front-to-back direction, and the length direction of the long sides is the left-to-right direction. The upper surface of the tabletop 50 is a work surface.

[0019] The upper arm 4 is fixed to the lower end of the tabletop 50. The upper arm 4 extends in the front-to-rear direction. The length of the upper arm 4 in the front-to-rear direction is slightly shorter than the length of the tabletop 50 in the front-to-rear direction. A pair of upper arms 4 are arranged at both ends of the tabletop 50 in the left-to-right direction.

[0020] The lifting legs 10 are arranged below the upper arm 4. The upper ends of the lifting legs 10 are fixed to the upper arm 4. The lifting legs 10 are arranged in the center of the tabletop 50 in the front-to-rear direction. The width of the lifting legs 10 in the front-to-rear direction is small. A pair of lifting legs 10 are arranged at both ends of the tabletop 50 in the left-to-right direction. In this application, the combination of the lifting legs 10 and the upper arm 4 is referred to as leg bodies 15. A pair of leg bodies 15 are arranged at both ends of the tabletop 50 in the left-to-right direction.

[0021] The lifting leg 10 has an extension / contraction section 12 and a drive unit 14. The extension / contraction section 12 extends in the vertical direction. The extension / contraction section 12 is capable of extending and contracting in the vertical direction. The drive unit 14 is connected to the upper end of the extension / contraction section 12. The drive unit 14 causes the extension / contraction section 12 to extend and contract in the vertical direction.

[0022] The connecting member 40 connects the pair of legs 15. Both left and right ends of the connecting member 40 are fixed to the upper ends of the pair of lifting legs 10. The connecting member 40 is also fixed to the tabletop 50. The connecting member 40 assists the pair of lifting legs 10 in raising and lowering synchronized movements.

[0023] The lower arm 8 is disposed below the lifting legs 10. The lower arm 8 extends in the front-to-rear direction. The center of the lower arm 8 in the front-to-rear direction is fixed to the lower end of the lifting leg 10. The pair of lower arms 8 are disposed at both ends of the tabletop 50 in the left-to-right direction.

[0024] The tabletop 50 is supported by the upper arm 4, the lifting legs 10, the connecting member 40, and the lower arm 8. The tabletop 50 can be raised and lowered in the vertical direction by the lifting legs 10 extending and retracting in the vertical direction. This allows the user to select the height of the tabletop 50 that is most comfortable for work, depending on their posture, physique, gender, preferences, etc.

[0025] 2 is a side view of the height-adjustable desk 1. The tabletop 50 has a tabletop main body 51 and side cover members 59. The side cover members 59 are attached to the left and right side surfaces (sides) of the tabletop main body 51. The side cover members 59 are made of a resin material or the like.

[0026] (First embodiment) FIG. 3 is a side cross-sectional view of the lift-top desk 1 in the first embodiment. The tabletop main body 51 in the first embodiment is formed from solid wood or the like. The shape of the tabletop main body 51 in a cross section perpendicular to the left-right direction is generally uniform. The tabletop main body 51 has a rear edge area 52, a main body area 53, and a front edge area 54. The rear edge area 52 is located at the rear end of the tabletop main body 51. The front edge area 54 is located at the front end of the tabletop main body 51. The main body area 53 is located between the rear edge area 52 and the front edge area 54 in the front-to-rear direction. The vertical thickness of the main body area 53 is thinner than the vertical thicknesses of the rear edge area 52 and the front edge area 54. The lower end of the main body area 53 is supported by the upper arm 4 of the leg 15.

[0027] 4 is a side cross-sectional view of the front end portion of the tabletop main body 51 at part Q1 in FIG. 3. The upper arm 4 is not shown in FIG. 4. The lower end portion 53z of the main body area 53 is disposed higher than the lower end portion 54z of the front edge area 54. This reduces the thickness of the main body area 53, making the tabletop 50 lighter. This reduces the mechanical burden on the legs 15 that support and raise and lower the tabletop 50.

[0028] A user of the desk 1 with adjustable top panel leans forward and leans against the front end of the top panel 50. This causes the front end of the top panel 50 to dig into the user's body, placing a strain on the user's body. The lower end 54z of the front edge area 54 is disposed lower than the lower end 53z of the main body area 53. This increases the thickness of the front edge area 54 and the surface area of ​​the front end of the table top 50. This prevents the front end of the table top 50 from digging into the user's body.

[0029] 2 and 3, the lower end of the side cover member 59 is positioned at approximately the same height in the vertical direction as the lower end 54z of the front edge area 54. The step between the lower end 54z of the front edge area 54 and the lower end 53z of the main body area 53 is concealed by the side cover member 59. This gives the desk 1 a unified appearance and enhances its aesthetic appeal.

[0030] As shown in Figure 4, the leading edge area 54 is connected to the front of the main body area 53. The upper surface of the main body area 53 is a plane perpendicular to the up-down direction. The upper surface of the leading edge area 54 is continuous with the upper surface of the main body area 53. The leading edge area 54 has an upper inclined portion 55.

[0031] The upper inclined portion 55 is formed on the upper side of the front edge area 54. The upper inclined portion 55 slopes downward toward the front. The upper inclined portion 55 ranges from a first position p1 to a third position p3. The first position p1 is the boundary between the main body area 53 and the front edge area 54. The third position p3 is the front end of the front edge area 54. By providing the upper inclined portion 55 on the front edge area 54 of the tabletop 50, the front end of the tabletop 50 is prevented from digging into the user's body.

[0032] The vertical height A of the upper inclined portion 55 is equal to or greater than the vertical height B of the main body area 53. This increases the surface area of ​​the upper inclined portion 55. This prevents the user's body parts from coming into contact with both the inside and outside of the upper inclined portion 55. This reduces the physical burden on the user.

[0033] The upper inclined portion 55 has a first inclined portion 55a and a second inclined portion 55b. The first inclined portion 55a is continuous with the main body area 53 and is located in front of the main body area 53. The first inclined portion 55a ranges from a first position p1 to a second position p2. The second position p2 is the boundary between the first inclined portion 55a and the second inclined portion 55b. The second inclined portion 55b is continuous with the first inclined portion 55a and is located between the first inclined portion 55a and the front end of the leading edge area 54. The second inclined portion 55b ranges from the second position p2 to a third position p3.

[0034] The first inclined portion 55a and the second inclined portion 55b are inclined by curved surfaces that convex upward. The first inclined portion 55a is a curved surface (cylindrical surface) with a first curvature radius Ra. Because the first curvature radius Ra is large, the first inclined portion 55a is a gentle slope and slopes smoothly. The second inclined portion 55b is a curved surface (cylindrical surface) with a second curvature radius Rb. Because the second curvature radius Rb is smaller than the first curvature radius Ra, the second inclined portion 55b is a steep slope.

[0035] The length C of the first inclined portion 55a in the front-rear direction is 3 to 5 times the height D of the first inclined portion 55a in the up-down direction. That is, 3D≦C≦5D holds. When a user works on a PC or writes on the desk 1 with its height-adjustable top, the user's body parts from their elbows to their wrists come into contact with the first inclined portion 55a. By satisfying the relationship 3D≦C≦5D, the inclination of the first inclined portion 55a becomes gentler and follows the angle of the user's body parts that come into contact with the first inclined portion 55a. This improves the comfort of the user's elbows and reduces the physical strain on the user.

[0036] The leading edge area 54 has an upper beveled portion 55 as well as a lower beveled portion 56 . The lower inclined portion 56 is formed below the leading edge area 54. The lower inclined portion 56 curves continuously from the upper inclined portion 55. The lower inclined portion 56 slopes downward toward the rear. The lower inclined portion 56 extends from a third position p3 to a fourth position p4. The fourth position is the boundary between the lower inclined portion 56 and the lower flat portion 57. The lower flat portion 57 is a plane perpendicular to the up-down direction and includes the lower end portion 54z of the leading edge area 54. The lower inclined portion 56 is continuous with the lower flat portion 57.

[0037] The lower inclined portion 56 is inclined by a curved surface that is convex downward. The radius of curvature of the curved surface (cylindrical surface) of the lower inclined portion 56 is equal to the second radius of curvature Rb of the second inclined portion 55b. The front edge area 54 has an upper inclined portion 55 and a lower inclined portion 56, and no corners are formed. This prevents the front end of the table top 50 from digging into the user's body, reducing the physical strain on the user.

[0038] As described above in detail, the height-adjustable desk 1 of this embodiment has a tabletop 50 and legs 15. The tabletop 50 has a work surface on its upper surface. The legs 15 support the tabletop 50 so that it can be raised and lowered in the vertical direction. The tabletop 50 has a main body area 53 whose lower end is supported by the legs 15, and a front edge area 54 connected to the front of the main body area 53. An upper inclined portion 55 that slopes downward toward the front is formed above the front edge area 54. A lower end 54z of the front edge area 54 is disposed below a lower end 53z of the main body area 53.

[0039] This reduces the thickness of the main body area 53, making the table top 50 lighter. On the other hand, the thickness of the front edge area 54 increases, increasing the surface area of ​​the front end of the table top 50. In particular, the surface area in the front-to-rear direction of the upper inclined portion 55 increases. This prevents the front end of the table top 50 from digging into the user's body. Therefore, the table top 50 can be made lighter while reducing the physical strain on the user.

[0040] (Second embodiment) 5 is a side cross-sectional view of the lift-top desk 1 in the second embodiment. The lift-top desk 1 in the second embodiment differs from the first embodiment in that the tabletop main body 51 is formed from a steel plate or the like. Explanation of the second embodiment in respect to the same points as the first embodiment may be omitted.

[0041] The tabletop body 51 of the second embodiment is formed by combining press-molded steel plates or the like. The shape of the tabletop body 51 in a cross section perpendicular to the left-right direction is generally constant. The tabletop body 51 has a trailing edge area 52, a main body area 53, and a leading edge area 54. The vertical height of the main body area 53 is lower than the vertical heights of the trailing edge area 52 and the leading edge area 54. A lower end 53z of the main body area 53 is supported by the upper arm 4 of the leg 15.

[0042] Figure 6 is a side cross-sectional view of the front end portion of the tabletop main body 51 at part Q2 in Figure 5. The upper arm 4 is not shown in Figure 6. The tabletop main body 51 has a base member 60, a surface covering material 61, a front reinforcing member 62, and an intermediate reinforcing member 64. The base member 60, the front reinforcing member 62, and the intermediate reinforcing member 64 are formed from press-molded steel plate or the like. The surface covering material 61 is formed from melamine resin or the like.

[0043] The base member 60 forms the outer shape of the top surface of the tabletop body 51. The base member 60 forms the outer shapes of the upper inclined portion 55 and the lower inclined portion 56 of the front edge area . The surface covering material 61 is attached to the outer surface of the base member 60 .

[0044] The front reinforcement 62 forms the outer shapes of the lower flat surface 57 and rear flat surface 58 of the leading edge area 54. The lower flat surface 57 is a plane perpendicular to the up-down direction and includes the lower end portion 54z of the leading edge area 54. The rear flat surface 58 is a plane perpendicular to the front-to-rear direction. The front end of the front reinforcement 62 is fitted between the upper inclined surface 55 and the lower inclined surface 56 of the leading edge area 54. The front reinforcement 62 reinforces the front end portion of the leading edge area 54. The front reinforcement 62 is fixed to the base member 60 by spot welding or the like.

[0045] 7 is a side view of the front end portion of the tabletop main body 51. Side reinforcement members 63 are attached to the left and right ends of the leading edge area 54. The side reinforcement members 63 are made of a resin material or the like. The side reinforcement members 63 are fitted inside the leading edge area 54. The side reinforcement members 63 reinforce the leading edge area 54.

[0046] As shown in Fig. 6, the intermediate reinforcement member 64 is disposed in the main body area 53. The intermediate reinforcement member 64 is disposed below the base member 60 and fixed to the base member 60 by spot welding or the like. The cross section of the intermediate reinforcement member 64 perpendicular to the left-right direction has a substantially U-shape. The lower end of the intermediate reinforcement member 64 is the lower end 53z of the main body area 53. The upper arm 4 is connected to the lower end of the intermediate reinforcement member 64.

[0047] As shown in FIG. 7, side plates 65 are arranged at the left-right ends of the main body area 53 (and the trailing edge area 52). The side plates 65 are flat plates that are perpendicular to the left-right direction. The side plates 65 are formed integrally with the base member 60. The front ends of the side plates 65 are located at approximately the same position in the front-to-rear direction as the front end of the main body area 53. The lower ends 65z of the side plates 65 are located below the lower end 53z of the main body area 53. The lower end 65z of the side plates 65 are located at approximately the same position in the up-down direction as the lower end 54z of the leading edge area 54.

[0048] The side cover members 59 shown in Figure 2 are attached to cover the side reinforcements 63 and the side panels 65. The side cover members 59 cover the entire sides of the tabletop main body 51. The lower ends of the side cover members 59 are positioned at approximately the same height in the vertical direction as the lower end 54z of the front edge area 54. This gives the height-adjustable tabletop desk 1 a unified appearance and enhances its aesthetic appeal.

[0049] In the height-adjustable tabletop desk 1 of the second embodiment described above, as in the first embodiment, the lower end 54z of the front edge area 54 is disposed below the lower end 53z of the main body area 53. This provides the same effects as the first embodiment. That is, the thickness of the main body area 53 is reduced, making the tabletop 50 lighter. On the other hand, the thickness of the front edge area 54 is increased, preventing the front end of the tabletop 50 from digging into the user's body. This reduces the weight of the tabletop 50 while reducing the physical strain on the user. In particular, in the height-adjustable tabletop desk 1 of the second embodiment, the tabletop main body 51 is formed from a steel plate or the like, making the tabletop 50 lighter.

[0050] (3rd form) This embodiment relates to a liftable tabletop fixture that is used in work spaces such as offices and public facilities, and allows the height of the tabletop to be adjusted up and down depending on the physique and desired posture of the worker.

[0051] In work spaces such as offices and public facilities, desks are typically installed to provide workers with a work area. The desk top height that is comfortable for workers varies greatly depending on the worker's physique, gender, preferences, etc. Since desks with a fixed top height cannot provide a suitable work area for each worker, desks with adjustable top heights are used. By using such height-adjustable desks, a work area with a top height that meets the worker's needs can be provided, improving work efficiency and reducing the physical strain on the worker.

[0052] Methods using gas springs and gears have been proposed as means for adjusting the tabletop height (see Japanese Patent Nos. 3371959 and 3391285). However, these methods have problems such as being difficult for weak workers to operate and being susceptible to poor operating posture depending on the tabletop height. In light of these problems, methods using electric drive units have been widely adopted to improve operability for workers (see Japanese Patent Laid-Open Nos. 2014-113505 and 5718503). This method allows the worker to easily adjust the tabletop height.

[0053] The structure of such furniture is generally composed of support legs that are spaced apart on the left and right of the floor and are extendable in the vertical direction, upper support members that extend from the top of the support legs in the front-to-back direction and support the underside of the tabletop, and a tabletop that forms a flat work surface. However, when the tabletop is lowered in response to an operator's operation, the underside of the upper support members may come into contact with items placed below the tabletop, potentially damaging the items and the upper support member.

[0054] The purpose of this embodiment is to provide a tabletop lifting fixture that can prevent the underside of the upper support member from coming into contact with items placed below the tabletop when the tabletop is lowered in response to an office worker's operation, thereby preventing damage to the items and the upper support member.

[0055] In order to solve the above problems, this embodiment proposes the following means. The lifting tabletop fixture of aspect A of this embodiment has a tabletop, lifting legs, and an upper support member. The tabletop has a work surface on its upper surface. The lifting legs are arranged spaced apart on the left and right and are extendable in the vertical direction. The upper support member extends in the front-to-rear direction from the top of the lifting legs and supports the underside of the tabletop. A recessed portion that recesses upward is formed in the underside of the tabletop. The upper support member is connected to the tabletop with at least a portion of the upper support member housed inside the recessed portion.

[0056] This prevents the underside of the upper support member from coming into contact with items placed below the tabletop when the tabletop is lowered by an operator, which could result in damage to the items and the upper support member, thereby increasing safety during use.In addition, the exposed portion of the upper support member can be minimized, improving the appearance of the furniture.

[0057] In aspect B of this embodiment, in the liftable tabletop fixture described in aspect A, the tabletop has a flat upper surface plate that forms the work surface and an edge portion that extends downward from the periphery of the upper surface plate, thereby forming a recess surrounded by the edge portion. This allows the recessed portion to be constructed simply and inexpensively.

[0058] In aspect C of this embodiment, in the lifting tabletop fixture described in aspect A or B, the tabletop has a first reinforcing member extending in the front-to-rear direction inside the recess. The upper support member opens upward, houses the first reinforcing member inside, and is connected to the first reinforcing member.

[0059] This allows almost the entire upper support member to be housed inside the recess. Therefore, when the top plate is lowered, the lower end of the upper support member is less likely to come into contact with items placed below the top plate. This reduces damage to the items and the upper support member, improving safety when using the lift-top display unit. In addition, the exposed portion of the upper support member can be minimized, resulting in a good appearance.

[0060] In aspect D of this embodiment, in the lifting tabletop fixture described in any one of aspects A to C, a pair of upper support members are arranged spaced apart in the left-right direction. The lifting tabletop fixture has a connecting member that extends in the left-right direction and connects the pair of upper support members. The tabletop has a second reinforcing member that extends in the left-right direction inside the recess. The connecting member opens upward, houses the second reinforcing member inside, and is connected to the second reinforcing member.

[0061] This allows almost the entire connecting member to be housed inside the recess. Therefore, when the tabletop is lowered, the lower end of the connecting member is less likely to come into contact with items placed below the tabletop. This reduces damage to the items and connecting member, improving safety when using the tabletop-lifting fixture. Furthermore, the exposed portion of the connecting member can be minimized, resulting in a good appearance.

[0062] In aspect E of this embodiment, in the liftable tabletop fixture described in aspect C, the upper support member is connected to the first reinforcing member by a fastening member inserted in the left-right direction inside the recessed portion. This allows the fastening members to be housed inside the recessed portion. Therefore, when the tabletop is lowered, the fastening members are less likely to come into contact with items placed below the tabletop. This reduces damage to the items and increases safety when using the tabletop lifting fixture. In addition, the fastening members are kept to a minimum, resulting in a good appearance.

[0063] In aspect F of this embodiment, in the liftable tabletop fixture described in aspect E, the upper support member is connected to the first reinforcing member by fastening members inserted from both left and right sides inside the recessed portion. This connects both the left and right sides of the upper support member to the first reinforcing member, positioning the upper support member in the vertical direction, thereby improving the stability of the lift-top fixture when in use.

[0064] The third embodiment of the height-adjustable desk 1 will now be described. Fig. 8 is a perspective view from below of the desk 1 with a liftable top in the third embodiment. Fig. 9 is an exploded perspective view of Fig. 8. Fig. 10 is a cross-sectional view of part X in Fig. 8. The desk 1 with a liftable top in the third embodiment is the same as that in the second embodiment.

[0065] 8, the base member 60 constituting the tabletop main body 51 includes an upper surface plate 60a. The upper surface plate 60a is flat and forms a work surface on the upper surface of the tabletop main body 51. 9, a front reinforcing member 62 is disposed along the front edge of the lower surface of the top plate 60a. The front reinforcing member 62 extends downward from the top plate 60a. The front reinforcing member 62 constitutes the front edge portion 74 of the tabletop body 51. A rear reinforcement member 66 is disposed along the rear edge of the lower surface of the top plate 60a. The rear reinforcement member 66 extends downward from the top plate 60a. The rear reinforcement member 66 constitutes a rear edge portion 72 of the tabletop body 51.

[0066] Side plates 65 are formed along the left-right side edges of the top plate 60a. The side plates 65 are bent downward from the top plate 60a. As shown in FIG. 10, the lower ends of the side plates 65 are bent inward in the left-right direction and then bent upward. This forms side plate reinforcing portions 65c at the lower ends of the side plates 65. The side plate reinforcing portions 65c constitute the side edge portions 73 of the top plate main body 51.

[0067] As shown in Figure 9, the top plate body 51 has an edge portion 70 that is composed of a front edge portion 74, a rear edge portion 72, and side edge portions 73. The edge portion 70 extends downward from the periphery of the upper surface plate 60a. The edge portion 70 is formed around the entire periphery of the upper surface plate 60a. The lower end surfaces of the edge portion 70 are arranged on approximately the same plane.

[0068] A recessed portion 80 is formed on the underside of the tabletop main body 51. The recessed portion 80 is an area surrounded by the edge portion 70. The recessed portion 80 recesses upward from the underside of the tabletop main body 51. An intermediate reinforcing member 64 is disposed inside the recessed portion 80. A plurality of intermediate reinforcing members 64 are disposed on the underside of the top panel 60a at intervals in the front-to-rear direction.

[0069] The upper arm (upper support member) 4 extends in the front-to-rear direction from the top of the lifting leg 10. The upper arm 4 has a pair of mounting brackets 4L. The pair of mounting brackets 4L are arranged at the center of the upper arm 4 in the front-to-rear direction, spaced apart in the front-to-rear direction. The drive unit 14 (see Figure 1) is arranged inside the pair of mounting brackets 4L. The mounting brackets 4L extend inward in the left-to-right direction. The cross section of the mounting bracket 4L perpendicular to the left-to-right direction is L-shaped.

[0070] At least a portion of the upper arm 4 is accommodated inside the recessed portion 80. As shown in FIG. 8, the upper half of the upper arm 4 is accommodated inside the recessed portion 80. For example, an area above the vertical center of the upper arm 4 is accommodated inside the recessed portion 80. The lower half of the upper arm 4 is exposed to the outside of the recessed portion 80. As shown in FIG. 10, the lower half of the upper arm 4 bends outward in the left-right direction and is positioned below the side panel reinforcing portion 65c. The left-right outer surfaces of the lower half of the upper arm 4 are positioned approximately flush with the outer surfaces of the side panels 65 of the top panel main body 51. The bottom portion of the upper arm 4 is exposed to the outside of the recessed portion 80.

[0071] The upper end of the upper arm 4 is connected to the bottom plate of the intermediate reinforcing member 64 of the tabletop main body 51. As shown in FIG. 10 , a nut N is fixed to the top surface of the bottom plate of the intermediate reinforcing member 64. A bolt (fastening member) B inserted from below the upper arm 4 is fastened to the nut N. This connects the upper arm 4 to the intermediate reinforcing member 64. The upper arm 4 supports the underside of the tabletop main body 51.

[0072] As described above, the third embodiment of the desk 1 with adjustable top panel has a top panel 50, lifting legs 10, and upper arm 4. The top panel 50 has a work surface on its upper surface. The lifting legs 10 are arranged spaced apart on the left and right and are extendable in the vertical direction. The upper arm 4 extends in the front-to-rear direction from the top of the lifting legs 10 and supports the underside of the top panel 50. A recess 80 that recesses upward is formed in the underside of the top panel 50. The upper arm 4 is connected to the top panel 50 with at least a portion of the upper arm 4 housed inside the recess 80.

[0073] Because at least a portion of the upper arm 4 is housed inside the recess 80, the lower end of the upper arm 4 is less likely to come into contact with items placed below the top plate 50 when the top plate 50 is lowered. This reduces damage to the items and the upper arm 4, improving safety when using the height-adjustable desk 1. In addition, the exposed portion of the upper arm 4 can be minimized, resulting in a good appearance.

[0074] (4th form) FIG. 11 is an exploded perspective view of the desk 1 with adjustable top in the fourth embodiment. In FIG. 11, the desk top 50 is a perspective view from below, and the other parts are a perspective view from above. FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11. The desk 1 with adjustable top in the fourth embodiment differs from the third embodiment in that almost the entire upper arm 4 is housed inside the recess 80. Explanation of the fourth embodiment in respect to the same points as the third embodiment may be omitted.

[0075] 11, the top plate 50 is made of a steel plate or the like. The top plate 50 has an upper surface plate 60a and an edge portion 70. The upper surface plate 60a is flat and forms a work surface on the upper surface of the top plate 50.

[0076] The edge portion 70 extends downward from the periphery of the top plate 60a. Specifically, as shown in FIG. 12, the periphery of the top plate 60a is bent downward to form the side plate 65. The lower end of the side plate 65 is bent inward in the left-right or front-rear direction and then bent upward. This forms the edge portion 70 with a J-shaped cross section on the periphery of the top plate 60a. As shown in FIG. 11, the edge portion 70 is formed around the entire periphery of the top plate 60a. The lower end surfaces of the edge portions 70 are arranged on approximately the same plane.

[0077] A recessed portion 80 is formed in the lower surface of the top plate 50. The recessed portion 80 is an area surrounded by the edge portion 70. The recessed portion 80 recesses upward from the lower surface of the top plate 50. A first reinforcing member 68 and a second reinforcing member 69 are disposed inside the recess 80. The first reinforcing member 68 and the second reinforcing member 69 are fixed to the lower surface of the upper plate 60a by spot welding or the like. The lower surfaces of the first reinforcing member 68 and the second reinforcing member 69 are located at the same position as the lower surface of the edge portion 70 or slightly higher than the lower surface of the edge portion 70 in the vertical direction.

[0078] The first reinforcing member 68 extends in the front-to-rear direction. The cross section of the first reinforcing member 68 perpendicular to the front-to-rear direction is generally U-shaped. The first reinforcing member 68 has a bottom plate and a pair of side plates. The front-to-rear ends of the first reinforcing member 68 extend close to the edge 70 of the top plate 50. The pair of first reinforcing members 68 are arranged near the outer ends of the recessed portion 80 in the left-to-right direction.

[0079] The second reinforcing member 69 extends in the left-right direction. The cross section of the second reinforcing member 69 perpendicular to the left-right direction has a substantially U-shaped shape. The left-right ends of the second reinforcing member 69 extend close to the pair of first reinforcing members 68. The second reinforcing member 69 is disposed close to the center of the tabletop 50 in the front-rear direction.

[0080] The upper arm 4 extends in the front-to-rear direction from the top of the lifting leg 10. The cross section of the upper arm 4 perpendicular to the front-to-rear direction is roughly U-shaped. The upper arm 4 has a bottom plate and a pair of side plates. The upper arm 4 opens upward. The front-to-rear end of the upper arm 4 extends close to the edge 70 of the tabletop 50. The upper arm 4 is positioned inside the edge 70 of the tabletop 50 in the left-to-right direction. The pair of upper arms 4 are positioned spaced apart in the left-to-right direction.

[0081] As shown in FIG. 12 , the upper arm 4 is housed inside the recessed portion 80 of the top plate 50. The first reinforcing member 68 of the top plate 50 is housed inside the upper arm 4. The upper end of the upper arm 4 does not abut against the top plate 60a of the top plate 50 or the first reinforcing member 68. The upper surface of the bottom plate of the upper arm 4 abuts against the lower surface of the bottom plate of the first reinforcing member 68. The lower surface of the bottom plate of the upper arm 4 is at approximately the same position as the lower surface of the edge portion 70 of the top plate 50 in the vertical direction. As a result, approximately the entire upper arm 4 is housed inside the recessed portion 80.

[0082] A nut N is fixed to the upper surface of the bottom plate of the first reinforcing member 68. A bolt B inserted from below the upper arm 4 is fastened to the nut N. This connects the upper arm 4 to the first reinforcing member 68 of the top plate 50. The upper arm 4 supports the underside of the top plate 50.

[0083] The inner surface of the left-right inner side plate of the pair of side plates of the upper arm 4 abuts against the outer surface of the left-right inner side plate of the pair of side plates of the first reinforcing member 68. The outer surface of the left-right outer side plate of the pair of side plates of the upper arm 4 abuts against the left-right inner side of the edge 70 of the tabletop 50. This positions the upper arm 4 in the left-right direction relative to the tabletop 50.

[0084] As shown in FIG. 11 , the connecting member 40 extends in the left-right direction. The cross section of the connecting member 40 perpendicular to the left-right direction has a substantially U-shaped shape. The connecting member 40 opens upward. The left-right ends of the connecting member 40 are connected to the upper arm 4. The connecting member 40 is positioned near the center of the tabletop 50 in the front-to-rear direction. The second reinforcing member 69 of the tabletop 50 is housed inside the connecting member 40, connecting the two. The lower surface of the bottom plate of the connecting member 40 is located at substantially the same position as the lower surface of the edge portion 70 of the tabletop 50 in the up-down direction. As a result, substantially the entire connecting member 40 is housed inside the recessed portion 80 of the tabletop 50.

[0085] As described above, in the fourth form of height-adjustable desk 1, almost the entire upper arm 4 is housed inside the recess 80. Therefore, when the top 50 is lowered, the lower end of the upper arm 4 is less likely to come into contact with an item placed below the top 50. This reduces damage to the item and the upper arm 4, and improves safety when using the height-adjustable desk 1. Furthermore, the exposed portion of the upper arm 4 can be minimized, resulting in a good appearance.

[0086] Furthermore, almost the entirety of the connecting member 40 is housed inside the recessed portion 80. Therefore, when the tabletop 50 is lowered, the lower end of the connecting member 40 is less likely to come into contact with an item placed below the tabletop 50. This reduces damage to the item and the connecting member 40, and improves safety when using the height-adjustable tabletop desk 1. Furthermore, the exposed portion of the connecting member 40 can be minimized, resulting in a good appearance.

[0087] Fig. 13 is an explanatory diagram of a first modified example of the fourth embodiment, and is a cross-sectional view taken along the line XII-XII in Fig. 11. The description of the first modified example in respects that are similar to the fourth embodiment may be omitted.

[0088] The inner surface of the left-right inner side plate of the pair of side plates of the upper arm 4 abuts against the outer surface of the left-right inner side plate of the pair of side plates of the first reinforcing member 68. A nut N is fixed to the inner surface of the left-right inner side plate of the pair of side plates of the first reinforcing member 68. A bolt B inserted from the left-right inner side of the upper arm 4 inside the recessed portion 80 is tightened into the nut N. This connects the upper arm 4 to the first reinforcing member 68 of the top plate 50.

[0089] Because the head of bolt B is housed inside recess 80, when tabletop 50 is lowered, the head of bolt B is less likely to come into contact with items placed below tabletop 50. This reduces damage to items and improves safety during use of height-adjustable tabletop desk 1. Furthermore, the exposure of the head of bolt B can be minimized, resulting in a good appearance.

[0090] Of the pair of side plates of the upper arm 4, the upper end of the outer side plate in the left-right direction is bent outward in the left-right direction and positioned above the edge 70 of the top plate 50. The upper end of the side plate of the upper arm 4 extends close to the top plate 60a. This positions the outer side of the left-right direction of the upper arm 4 in the vertical direction. Meanwhile, the inner side of the left-right direction of the upper arm 4 is positioned in the vertical direction by tightening the bolt B / nut N. As described above, both the left and right sides of the upper arm 4 are positioned in the vertical direction.

[0091] Figure 14 is an explanatory diagram of a second modified example of the fourth embodiment, and is a cross-sectional view taken along the line XII-XII in Figure 11. The description of the second modified example that is the same as the fourth embodiment may be omitted.

[0092] A pair of first reinforcing members 68 are arranged near the edge 70 of the tabletop 50. The pair of first reinforcing members 68 are arranged spaced apart in the left-right direction. The upper arm 4 is arranged between the pair of first reinforcing members 68. The pair of side plates of the upper arm 4 abut against or are close to the side plates of the first reinforcing members 68. A nut N is fixed to the inner surface of each of the pair of side plates of the upper arm 4. A bolt B is inserted from the opposite side of the upper arm 4 across the first reinforcing member 68 and tightened into the nut N. This connects the upper arm 4 to the first reinforcing member 68 of the tabletop 50.

[0093] The upper arm 4 is connected to the pair of first reinforcing members 68 by bolts B inserted from both left and right sides inside the recessed portion 80, and both left and right sides of the upper arm 4 are connected to the pair of first reinforcing members 68. This positions both left and right sides of the upper arm 4 in the up and down direction, thereby improving the stability of the height-adjustable desk 1 when in use.

[0094] (Aspect A) a top plate having a work surface on its upper surface; Lifting legs arranged at a distance from each other on the left and right sides and extendable in the up and down direction; an upper support member extending in the front-rear direction from the upper part of the lifting legs and supporting the underside of the tabletop; A recessed portion recessed upward is formed on the lower surface of the top plate, The upper support member is connected to the top plate with at least a portion of the upper support member housed inside the recess. Display unit with a liftable top. (Mode B) The top plate has a flat upper surface plate that forms the work surface and an edge portion that extends downward from the periphery of the upper surface plate, thereby forming the recessed portion surrounded by the edge portion. A lifting tabletop fixture according to aspect A. (Aspect C) the top plate has a first reinforcing member extending in the front-rear direction inside the recessed portion, The upper support member is open upward to accommodate the first reinforcing member therein and is connected to the first reinforcing member. A lifting tabletop fixture according to aspect A or B. (Aspect D) The pair of upper support members are disposed spaced apart in the left-right direction, a connecting member extending in the left-right direction and connecting the pair of upper support members; the top plate has a second reinforcing member extending in the left-right direction inside the recessed portion, The connecting member opens upward to accommodate the second reinforcing material therein and is connected to the second reinforcing material. A lifting table fixture according to any one of aspects A to C. (Aspect E) The upper support member is connected to the first reinforcing member by a fastening member inserted in the left-right direction inside the recessed portion. A lifting tabletop fixture according to embodiment C. (Aspect F) The upper support member is connected to the first reinforcing member by the fastening members inserted from both left and right sides inside the recessed portion. A lifting tabletop fixture according to aspect E.

[0095] 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 are also included within the scope that does not deviate from the gist of the present invention. [Explanation of symbols]

[0096] Ra…first radius of curvature Rb…Second radius of curvature 1. Height-adjustable desk (height-adjustable display unit) 15…Leg body 50...Tabletop 53...Main body area 54…leading edge area 55...Upper slope part 55a...first slope part 55b…Second slope part 56...Lower slope part 59...Side cover member B...Bolt (fastening member) 4...Upper arm (upper support member) 10...Lifting legs 40...Connecting member 60a…Top plate 68...First reinforcement 69...Second reinforcement 70...Edge 80...Otoiribe

Claims

1. A top plate having a work surface on an upper surface thereof; and a leg body that supports the top plate so that the top plate can be raised and lowered in the vertical direction. The top plate has a main body area whose lower end is supported by the leg body, and a front edge area connected to the front of the main body area, An upper inclined portion is formed on the upper side of the leading edge area, the upper inclined portion inclining downward toward the front, A lower end of the leading edge area is disposed below a lower end of the main body area. Display rack with liftable top.

2. The vertical height of the upper inclined portion is equal to or greater than the vertical height of the main body area. A liftable display fixture as described in claim 1.

3. The upper inclined portion is a first inclined portion disposed forward of the main body area and continuous with the main body area, the first inclined portion being inclined by a curved surface having a first radius of curvature; a second inclined portion disposed between the first inclined portion and a front end of the leading edge area and inclined by a curved surface having a second radius of curvature smaller than the first radius of curvature; The length of the first inclined portion in the front-rear direction is 3 times or more and 5 times or less than the height of the first inclined portion in the up-down direction. A display unit with a liftable top as described in claim 1 or 2.

4. A lower inclined portion is provided below the leading edge area and curves from the upper inclined portion and inclines downward toward the rear. A display unit with a liftable top as described in claim 1 or 2.

5. A side cover member is provided on a side of the top plate, The lower end of the side cover member is located at a position substantially equal to the lower end of the front edge area in the up-down direction. A display unit with a liftable top as described in claim 1 or 2.

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