Top board elevation-type fixture

Abstract

To improve convenience by enabling the placement of objects beneath a top board in a top board elevation-type fixture having the cantilever-supported elevation-type top board.SOLUTION: A top board elevation-type fixture comprises a support structure 3 including a grounding part 5 that makes contact with a floor and a telescopic part 6 formed to be extendable and contractible in the vertical direction, and a top board 2 vertically displaceably supported by the support structure 3 and including a front end part and a rear end part, and a coupled part 69 located between the center of gravity and the rear end part and coupled to the telescopic part 6. A front-end side region of the top board 2 between the center of gravity and the front end part is arranged at a position that does not overlap with the grounding part 5 when viewed from the vertical direction. The top board 2 is provided with a stop device configured to detect contact between the top board 2 and another object and stop the extension or contraction operation of the telescopic part 6.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 work spaces such as offices and public facilities, desk equipment is generally provided to provide workers with a work area. In such desk equipment, since the height of the tabletop that is easy to work at varies depending on the physique, sex, and preferences of the worker, a tabletop lifting fixture with a lifting function that allows the height of the tabletop to be changed is used. This makes it possible to provide a work area with a tabletop height that meets the needs of the worker, thereby reducing the burden on the worker.

[0003] A lifting tabletop fixture is formed to be expandable in the vertical direction, and includes a support structure that is fixed to the floor and supports the tabletop. In some cases, the support structure of a lifting tabletop fixture is formed so that the tabletop is supported by a cantilever (see, for example, Patent Document 1). Patent Document 1 discloses a table that has lifting legs that raise and lower the tabletop in conjunction with the expansion and contraction movement in the vertical direction, and includes a support structure that supports the tabletop from below by a cantilever. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-137270 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in a lift-top type furniture unit in which the top is supported by a cantilever, it is desirable to configure it so that objects such as carts can be placed below the top, thereby improving convenience.

[0006] SUMMARY OF THE PRESENT DISCLOSURE The present invention aims to improve convenience of a lift-top type furniture having a cantilevered lift-top by allowing objects to be placed below the top. [Means for solving the problem]

[0007] A first aspect of the present invention is a lifting tabletop fixture comprising a support structure having a grounding portion that is grounded to the floor and an extension portion formed so as to be extendable and retractable in the vertical direction, and a tabletop supported on the support structure so as to be displaceable in the vertical direction, having a first end and a second end spaced apart in a first horizontal direction, and a connecting portion located between the center of gravity and the first end and connected to the extension portion, wherein the second end side region of the tabletop between the center of gravity and the second end is positioned in a position that does not overlap with the grounding portion when viewed from the vertical direction, and the tabletop is provided with a stopping device that detects contact between the tabletop and another object and stops the extension and retraction movement of the extension portion.

[0008] According to the first aspect, the tabletop is cantilevered on the support structure, and there is no grounding portion of the support structure below the second end region near the free end of the tabletop, making it easier to place other objects such as a cart below the tabletop. Furthermore, if the descending tabletop comes into contact with another object placed below the tabletop, the stopping device can stop the descent of the tabletop. Therefore, the convenience of the tabletop lifting fixture can be improved by making it possible to place an object below the tabletop while preventing the object from being caught between the tabletop and the floor.

[0009] A second aspect of the present invention relates to a lift-top display fixture of the first aspect described above, wherein at least a part of the stopping device is provided closer to the second end than the connectable portion.

[0010] According to the second aspect, since the stopping device is provided at a location on the top plate that is likely to come into contact with another object when the top plate is lowered, it is possible to more easily detect contact between the lowering top plate and another object.

[0011] A third aspect of the present invention is a lift-top display fixture according to the first or second aspect above, wherein the top is provided in a first end side region between the center of gravity and the first end, and is provided with a reinforcing portion that increases the rigidity of the first end side region relative to the second end side region, and the stopping device is provided closer to the second end than the reinforcing portion.

[0012] According to the third aspect, since the tabletop is supported by a cantilever, it is necessary to reinforce the area around the coupled part near the first end of the tabletop, but if a reinforcing structure is provided over substantially the entire length of the tabletop in the first direction, the weight of the tabletop increases, which is inconvenient for the operability of the tabletop. Therefore, by utilizing the fact that the rigidity of the second end side area is relatively low by providing the reinforcing part only in the first end side area, a stopping device is provided in the second end side area, which is more likely to tilt than the first end side area, and it is possible to more easily detect contact between the descending tabletop and another object.

[0013] A fourth aspect of the present invention is a lift-top display fixture according to any one of the first to third aspects above, wherein the display fixture has a first length along the first direction and a second length along a horizontal second direction perpendicular to the first direction, the second length being shorter than the first length.

[0014] According to the fourth aspect, the longitudinal direction of the top plate in plan view is aligned with the first direction, so that the top plate is formed long from the coupled portion to the second end portion, which makes it easier for other objects to be present below the top plate, providing an optimal configuration for achieving the above-mentioned effects.

[0015] A fifth aspect of the present invention relates to a lifting tabletop fixture in which the stopping device is equipped with a detection unit that detects the tilting of the tabletop in any of the first to fourth aspects described above.

[0016] For example, if the detection unit is a contact sensor or pressure sensor, it is necessary to provide the detection unit within the range where the effect of the tabletop touching other objects spreads, and the number of detection units must be increased as the tabletop becomes larger in the horizontal direction so that the contact of other objects with any part of the tabletop can be detected. According to the fifth aspect, the tilting of a specific member on the tabletop spreads to the entire specific member, and is detected by one detection unit provided on the specific member. Therefore, since it is sufficient to provide one detection unit for the member whose tilting is to be detected, the increase in the number of detection units can be suppressed even if the tabletop is made larger, and the complication of the structure of the lifting tabletop fixture and the increase in manufacturing costs due to the increase in detection units can be avoided.

[0017] A sixth aspect of the present invention is a lift-top display fixture according to the fifth aspect above, wherein the top comprises a top body forming an upper surface of the top body, and a tilting member which is displaceable relative to the top body and has a lower surface facing the floor surface, and the detection unit may be provided on the tilting member.

[0018] According to the sixth aspect, since the tilting member arranged in a position on the tabletop where it is likely to come into contact with an object below it can be displaced relative to the tabletop body, the tilting member is provided with a detection unit, so that contact between the tabletop and another object can be detected even if the tabletop body does not tilt sufficiently. Therefore, it is possible to more easily detect contact between the descending tabletop and another object.

[0019] A seventh aspect of the present invention relates to a lifting tabletop fixture according to the sixth aspect, wherein the tilting member is cantilevered relative to the tabletop body.

[0020] According to the seventh aspect, the tilting member can be tilted more easily than in a configuration in which the tilting member is supported at both ends, and therefore it is easier to detect contact between the descending top plate and another object.

[0021] The eighth aspect of the present invention is a lift-top display fixture according to the sixth or seventh aspect above, wherein the top has a first length along the first direction and a second length along a horizontal second direction perpendicular to the first direction that is smaller than the first length, and the tilting member has a longitudinal direction along the first direction.

[0022] According to the eighth aspect, since the first direction is along the longitudinal direction of the top plate in plan view, the top plate is formed long from the coupled portion to the second end. Therefore, other objects are likely to be present below the top plate, and since the tilting member is also formed long in the first direction, when the top plate descends, the tilting member is likely to come into contact with other objects present below the top plate. Therefore, it is possible to more easily detect the contact between the descending top plate and other objects.

[0023] A ninth aspect of the present invention is a lift-top display fixture according to any one of the sixth to eighth aspects above, in which the tilting member is flat and has the lower surface as one main surface.

[0024] According to the ninth aspect, when another object comes into contact with the tilting member from below, the tilting member is easily bent, making it easier to detect contact between the descending top plate and another object. Effect of the Invention

[0025] According to the present invention, the convenience of a liftable tabletop fixture can be improved by preventing objects from getting caught between the tabletop and the floor while allowing objects to be placed below the tabletop. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a perspective view of a liftable tabletop fixture according to a first embodiment. [Diagram 2] FIG. 1 is a perspective view of a liftable tabletop fixture according to a first embodiment, showing a state in which the storage housing has been removed. [Diagram 3]FIG. 2 is a perspective view of a top plate and a support structure according to the first embodiment. [Figure 4] FIG. 2 is a side view of the top plate and support structure according to the first embodiment. [Diagram 5] FIG. 1 is a perspective view of a liftable tabletop fixture according to a first embodiment, showing the state in which the tabletop body has been removed. [Figure 6] FIG. 3 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 2 is a perspective view of the tabletop and support structure according to the first embodiment, showing a state in which a tilting member and a detection unit have been removed. [Figure 8] FIG. 11 is a perspective view of a liftable tabletop fixture according to a second embodiment, showing the tabletop body removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, components having the same or similar functions are given the same reference numerals. Further, duplicated descriptions of those components may be omitted. In the following description, the direction perpendicular to the floor surface F on which the lifting tabletop fixture 1 is installed is defined as the up-down direction, and the directions perpendicular to the up-down direction are defined as the front-rear direction (first direction) and the left-right direction (second direction). In the drawings used in the following description, the arrow UP indicates upward, the arrow FR indicates forward, and the arrow LH indicates leftward.

[0028] (First embodiment) Fig. 1 is a perspective view of the liftable tabletop fixture 1 according to the first embodiment. Fig. 2 is a perspective view of the liftable tabletop fixture 1 according to the first embodiment, showing a state in which the storage housing 4 has been removed. As shown in Figures 1 and 2, the lifting table fixture 1 is installed in a room that employs a double floor structure in which a space of a specified vertical width is formed between a foundation floor B such as a concrete slab and a floor panel P that forms the floor surface F. In the following explanation, at least one of the foundation floor B and the floor panel P will be simply referred to as the floor. The lifting table fixture 1 comprises a table 2, a support structure 3 that is fixed to the floor and supports the table 2, and a storage housing 4 that is arranged to surround the support structure 3.

[0029] As shown in FIG. 1, the storage housing 4 is placed on a floor panel P. The storage housing 4 is directly fixed to the floor panel P. However, the storage housing 4 may not be directly fixed to the floor panel P, and may simply be grounded via a grounding member such as an adjuster (not shown). The storage housing 4 is formed in a hollow rectangular parallelepiped shape. The storage housing 4 is formed long in the left-right direction.

[0030] 1 and 2, the support structure 3 stands upward with respect to the base floor B. The support structure 3 has a length in the vertical direction, penetrates the storage housing 4 in the vertical direction, and protrudes upward from the storage housing 4.

[0031] FIG. 3 is a perspective view of the tabletop 2 and the support structure 3 according to the first embodiment. As shown in FIG. 2 and FIG. 3, the support structure 3 includes a grounding part 5 that is grounded on the foundation floor B, and an expandable part 6 that is formed so as to be expandable in the vertical direction. The grounding part 5 is made of metal. The grounding part 5 is fixed to the foundation floor B. The grounding part 5 is fastened to the upper surface of the foundation floor B via an anchor bolt embedded in the foundation floor B. The lower part of the expandable part 6 is connected to the grounding part 5 so as not to be displaceable relative to the grounding part 5. The upper part of the expandable part 6 is connected to the lower surface of the top plate 2 so as not to be displaceable relative to the grounding part 5, and supports the top plate 2 from below. The expandable part 6 expands and contracts in the vertical direction so as to move its lower and upper parts closer to and away from each other, thereby raising and lowering the top plate 2. In this embodiment, the expandable part 6 includes a lifting unit having a telescopic structure and a cover that surrounds the lifting unit.

[0032] FIG. 4 is a side view of the tabletop 2 and the support structure 3 according to the first embodiment. As shown in Figs. 2 and 4, the tabletop 2 is formed in a flat plate shape extending in the horizontal direction. The tabletop 2 has a first length along the front-rear direction and a second length along the left-right direction. The second length is smaller than the first length. As a result, the tabletop 2 is formed long in the front-rear direction, and has a front end (second end) and a rear end (first end) spaced apart in the front-rear direction. The tabletop 2 is disposed so as to protrude forward from the support structure 3 in a plan view.

[0033] Here, the top plate 2 is divided into two regions in the longitudinal direction (front-rear direction). The region of the top plate 2 located between the center of gravity G of the top plate 2 and the rear end in the front-rear direction is the rear end side region 2r (first end side region), and the region located between the center of gravity G of the top plate 2 and the front end in the front-rear direction is the front end side region 2f (second end side region). The front end side region 2f is located forward of the grounding portion 5 of the support structure 3. As a result, neither the support structure 3 nor the storage housing 4 is present below the front end side region 2f (also see FIG. 1).

[0034] FIG. 5 is a perspective view of the liftable tabletop fixture 1 according to the first embodiment, showing a state in which the tabletop main body 50 has been removed. 1 and 5, the tabletop 2 includes a tabletop main body 50 forming its upper surface, a support frame 55 arranged along the underside of the tabletop main body 50, a front end cover 57 and a rear end cover 58 covering the support frame 55, a tilting member 70 arranged below the tabletop main body 50, and a stop device 80 that detects contact between the tabletop 2 and another object and stops the extension / retraction action of the extension / retraction section 6. The tabletop main body 50 forms the entire tabletop 2 when viewed from above. That is, the above-mentioned first length and second length are defined in the tabletop main body 50.

[0035] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in Fig. 6, a support member 40 made of a predetermined material and formed into a predetermined shape is fixed to the underside of the tabletop main body 50. An operating member 45 is movably supported on the support member 40 for sending an electrical signal to the extension / contraction section 6 through internal wiring to operate the extension / contraction section 6. In this embodiment, the entire support member 40 overlaps the tabletop main body 50 in plan view, and the operating member 45 is disposed so as to protrude to the right from the tabletop main body 50 in plan view. The operating member 45 is disposed in the same range as the extension / contraction section 6 in the longitudinal direction (front-rear direction) of the tabletop main body 50.

[0036] 3 and 5, the support frame 55 supports the tabletop body 50 from below. The support frame 55 is made of metal. The support frame 55 includes a base 60 connected to the support structure 3, a pair of crosspiece members 62 connected to the base 60 and extending along the longitudinal direction of the tabletop body 50, and an installation member 64 installed between the pair of crosspiece members 62.

[0037] The base 60 is box-shaped and opens upward. The base 60 includes a bottom 60a extending substantially parallel to the top plate body 50, an upright portion 60b rising upward from the side edge of the bottom 60a to form the side wall of the base 60, and a reinforcing plate 61 overlapping the bottom 60a. The bottom 60a is a plate material extending in the horizontal direction. The base 60 has a rectangular shape in plan view with a pair of sides extending in the left-right direction and the remaining pair of sides extending in the front-rear direction. The upper portion of the expandable portion 6 is joined to the bottom 60a.

[0038] The standing portion 60b includes a front portion connected to the front edge of the bottom portion 60a, a rear portion connected to the rear edge of the bottom portion 60a, a left portion connected to the left edge of the bottom portion 60a, and a right portion connected to the right edge of the bottom portion 60a. For example, the left and right portions of the standing portion 60b are connected to the front and rear portions of the standing portion 60b, respectively. As a result, the standing portion 60b extends continuously around the entire circumference of the bottom portion 60a when viewed from above. However, the front, rear, left, and right portions of the standing portion 60b do not have to be connected to each other.

[0039] The reinforcing plate 61 extends substantially parallel to the bottom 60a (see FIG. 3). The reinforcing plate 61 is formed slightly smaller than the bottom 60a in a plan view so as to fit inside the side wall of the base 60. The reinforcing plate 61 overlaps substantially the entire bottom 60a from above. The reinforcing plate 61 is fixed to the bottom 60a by welding, fastening, or the like. However, the reinforcing plate 61 may be omitted.

[0040] As shown in FIG. 5, the cross-section of the crosspiece 62 is a rectangular tube that is elongated in the left-right direction. The cross-piece 62 is connected to the base 60 so as to be immovable relative to the base 60. The cross-piece 62 is arranged in the left-right direction and spaced apart from each other in the left-right direction. The cross-piece 62 is arranged to sandwich the base 60 from both sides in the left-right direction. The cross-piece 62 is connected to the left and right parts of the base 60 in a one-to-one relationship. The cross-piece 62 is directly connected to the base 60 by welding and integrated. However, the cross-piece 62 may be connected to the base 60 by a method other than welding, such as fastening. The cross-piece 62 extends forward so as to narrow the left-right distance between the cross-piece 62. The cross-piece 62 extends horizontally. The cross-piece 62 is connected to the lower surface of the tabletop body 50 so as to be immovable relative to the base 60. The rail members 62 are disposed from the rear end region 2r to the front end region 2f shown in Fig. 1. The rail members 62 extend across the center of gravity of the table top body 50 in the front-rear direction, and support the table top body 50 from its rear end to its front end.

[0041] The installation member 64 extends in the left-right direction and is connected to the pair of cross-section members 62. For example, the installation member 64 is a rectangular tube that is elongated in a cross-sectional view in the front-rear direction. A plurality of installation members 64 are provided at intervals in the front-rear direction. The plurality of installation members 64 include a front installation member 65 arranged near the front end of the support frame 55 and a pair of rear installation members 66 arranged near the rear end of the support frame 55. The front installation member 65 is arranged in the front end side region 2f. The front installation member 65 connects the front ends of the pair of cross-section members 62. The pair of rear installation members 66 are arranged at intervals from each other in the front-rear direction. At least one of the pair of rear installation members 66 is arranged in the rear end side region 2r. The pair of rear installation members 66 are connected to the front and rear parts of the upright parts 60b of the base 60 in a one-to-one relationship. The installation members 64 are directly connected to the base 60 by welding to be integrated. However, the installation members 64 may be connected to the base 60 by a method other than welding, such as fastening. A pair of rear installation members 66 connect the pair of rail members 62 to each other at the front and rear of the base 60. The installation members 64 may also support the tabletop main body 50 from below.

[0042] The base 60 having the above configuration has the crosspiece member 62 and the rear installation member 66 fixed to each other and integrated. As a result, the crosspiece member 62 is restricted by the rear installation member 66 from displacing in a direction intersecting its length direction, and the rear installation member 66 is restricted by the crosspiece member 62 from displacing in a direction intersecting its length direction. The integrated base 60, crosspiece member 62, and rear installation member 66 function as a reinforcing portion 68 that enhances the rigidity of the rear end side region 2r relative to the front end side region 2f. In this embodiment, the reinforcing portion 68 is the base 60, the pair of rear installation members 66, and a portion of the crosspiece member 62 that cooperates with the rear installation members 66 to surround the base 60. At least a part of the reinforcing portion 68 is located in the rear end side region 2r (see FIG. 4).

[0043] 3, the reinforcing portion 68 has a joined portion 69 that is joined to the stretchable portion 6. The joined portion 69 is provided on the base portion 60. The entire joined portion 69 is located in the rear end side region 2r (also see FIG. 4).

[0044] FIG. 7 is a perspective view of the tabletop 2 and the support structure 3 according to the first embodiment, showing a state in which the tilting member 70 and detection units 81A and 81B (described later) have been removed. As shown in FIG. 5 and FIG. 7, the front end cover 57 covers the front end of the support frame 55. The front end cover 57 is formed of a metal plate material. The front end cover 57 is formed in a box shape that opens upward and backward, and covers the front end of the pair of crosspiece members 62 from the outside in the left-right direction, below, and from the front. The front end cover 57 includes a bottom wall portion, a pair of left and right side wall portions extending upward from the left and right end edges of the bottom wall portion, and a front wall portion extending upward from the front end edge of the bottom wall portion. Each side wall portion is fastened to the side surface of the crosspiece member 62 on the same left and right side that faces outward in the short direction of the top plate 2. The bottom wall portion is fastened to the lower surface of the pair of crosspiece members 62. The upper end opening edge of the front end cover 57 has a gap in the vertical direction with respect to the lower surface of the top plate main body 50.

[0045] The rear end cover 58 covers the rear end of the support frame 55. The rear end cover 58 is disposed at a position overlapping the storage housing 4 in a plan view. The rear end cover 58 is formed of a metal plate material. The rear end cover 58 is formed in a box shape that opens upward and forward, and covers the rear end of the pair of crosspiece members 62 from the outside in the left-right direction, below, and behind. The rear end cover 58 includes a bottom wall portion, a pair of left and right side wall portions extending upward from the left and right end edges of the bottom wall portion, and a rear wall portion extending upward from the rear end edge of the bottom wall portion. Each side wall portion is fastened to the side surface of the crosspiece member 62 on the same left and right side that faces outward in the short direction of the top plate 2. The bottom wall portion is fastened to the lower surface of the pair of crosspiece members 62. The upper end opening edge of the rear end cover 58 has a gap in the vertical direction with respect to the lower surface of the top plate main body 50.

[0046] As shown in FIG. 3, the tilting member 70 is disposed below the tabletop body 50. The tilting members 70 are disposed on both sides of the tabletop 2 in the short-side direction (left-right direction) relative to the support frame 55. The entire tilting member 70 is located inside the outline of the tabletop body 50 when viewed from above. By disposing the tilting member 70 relative to the tabletop body 50 in this manner, the outer peripheral edge of the tabletop body 50 that does not overlap with the tilting member 70 in a plan view can function as an article attachment portion such as a monitor clamp. The tilting member 70 has a longitudinal direction along the front-rear direction and is disposed along the crosspiece members 62 on the same left and right sides. The tilting member 70 is supported by the crosspiece members 62. The tilting member 70 is provided so as to be displaceable relative to the tabletop body 50.

[0047] As shown in FIG. 5, the tilting member 70 comprises a bottom plate 71, a connecting portion 72 that interconnects the bottom plate 71 and the crosspiece member 62, a rib 73 connected to the bottom plate 71 and the connecting portion 72, a pair of front and rear side wall portions 74 that define the space above the bottom plate 71 from the front-rear direction, and an edge portion 75 that forms the upper edge of the tilting member 70.

[0048] The connecting portion 72 is formed in a flat plate shape. The connecting portion 72 has a substantially constant height in the up-down direction and extends along the longitudinal direction of the crosspiece member 62 on the same left and right side. The connecting portion 72 is disposed along the side surface of the crosspiece member 62 facing outward in the short direction of the top plate 2. The connecting portion 72 extends longer on both the front and rear sides than the crosspiece member 62. The front end portion of the connecting portion 72 extends along the side wall portion of the front end cover 57 on the same left and right side as the connecting portion 72. The rear end portion of the connecting portion 72 extends along the side wall portion of the rear end cover 58 on the same left and right side as the connecting portion 72. The connecting portion 72 is fixed to the crosspiece member 62 by being fastened to the crosspiece member 62 at a plurality of points in the longitudinal direction of the crosspiece member 62. The connecting portion 72 is fastened to the crosspiece member 62 with the side wall portion of the front end cover 57 sandwiched between the connecting portion 72 and the front end portion of the crosspiece member 62. The connecting portion 72 is fastened to the rear end portion of the rail member 62 with the side wall portion of the rear end cover 58 sandwiched between the connecting portion 72 and the rear end portion of the rail member 62 .

[0049] The bottom plate 71 extends from substantially the entire lower edge of the connecting portion 72 outward in the short-side direction of the tabletop 2 in a plan view. The bottom plate 71 extends at an angle relative to the horizontal direction so as to approach the underside of the tabletop main body 50 as it moves away from the connecting portion 72. The bottom plate 71 has a constant width in the left-right direction when viewed from the top-down direction, and extends along the longitudinal direction of the crosspiece members 62 on the same left and right side. An edge 71a of the bottom plate 71 on the outside in the short-side direction of the tabletop 2 extends horizontally and parallel to the connecting portion 72. The edge 71a of the bottom plate 71 is located below the underside of the tabletop main body 50.

[0050] 3, the bottom plate 71 has a lower surface 71b facing the floor surface F. The lower surface 71b of the bottom plate 71 forms substantially the entire lower surface of the tilting member 70. The lower surface 71b of the bottom plate 71 faces in a direction inclined outward in the short side direction of the top plate 2 with respect to the vertical downward direction, following the inclination angle of the bottom plate 71.

[0051] 5, the rib 73 is arranged so that its front and back surfaces face in the longitudinal direction of the tilting member 70. A plurality of ribs 73 are arranged at approximately equal intervals in the longitudinal direction of the tilting member 70. The ribs 73 are arranged so as to avoid the fastening points between the connecting portion 72 and the crosspiece member 62. The rib 73 is joined to the upper surface of the bottom plate 71 and to the surface of the connecting portion 72 facing the bottom plate 71 by welding or the like.

[0052] The side wall portions 74 extend upward from the front and rear edges of the bottom plate 71 toward the top plate main body 50. Each side wall portion 74 is connected to the front and rear edges of the connecting portion 72. An upper edge 74a of the side wall portion 74 extends horizontally along the short side direction of the top plate 2 and is connected to an edge 71a of the bottom plate 71.

[0053] The edge portion 75 protrudes upward from the end edge 71a of the bottom plate 71 and the upper end edge 74a of each side wall portion 74. The edge portion 75 is connected over substantially the entire length to the end edge 71a of the bottom plate 71 and the upper end edge 74a of each side wall portion 74. As a result, the edge portion 75 extends in a U-shape that opens toward the support frame 55 side when viewed from the top-bottom direction.

[0054] The right tilting member 70 has a notch 76 formed therein to avoid the support member 40 and the operating member 45 (also see FIG. 3). The notch 76 is formed in the same range as the reinforcing part 68 in the longitudinal direction of the tabletop main body 50, corresponding to the position of the operating member 45. The notch 76 is cut downward from the upper end edge of the edge part 75, and is formed from the edge part 75 to the bottom plate 71. The edge of the notch 76 extends so as to surround the support member 40, and has a gap in the vertical direction with respect to the support member 40 below the support member 40.

[0055] 6, the tilting member 70 having the above-mentioned configuration is indirectly supported in a cantilever manner on the tabletop body 50 via the support frame 55, with the connecting portion 72 as a base end. This allows the tilting member 70 to displace the bottom plate 71, the side wall portion 74, and the edge portion 75 in the vertical direction.

[0056] As shown in Figs. 6 and 7, a groove 51 that receives the upper end of the edge 75 is formed on the underside of the tabletop body 50. A pair of grooves 51 are provided on the left and right sides corresponding to the tilting member 70. Each groove 51 extends in a U-shape following the shape of the edge 75 in a plan view. The groove 51 receives the edge 75 so as to be able to move upward. By receiving the edge 75 in the groove 51, the tabletop body 50 is not in contact with at least the bottom plate 71, the pair of side walls 74, and the edge 75 of the tilting member 70.

[0057] The tilting member 70 can tilt with respect to the floor surface F when an external force is applied to the top board 2, such as when another object in the vicinity comes into contact with the top board 2. For example, since the tilting member 70 is supported by the support frame 55, when the top board main body 50 and the support frame 55 tilt, the tilting member 70 tilts together with the top board main body 50 and the support frame 55. Furthermore, when another object comes into contact with the tilting member 70, the tilting member 70 can tilt independently with respect to the top board main body 50 and the support frame 55 due to elastic deformation of the tilting member 70 itself. For example, when an object comes into contact with the bottom plate 71 from below, the tilting member 70 elastically deforms so that the bottom plate 71 tilts upward and the edge portion 75 enters further into the groove portion 51 of the top board main body 50.

[0058] As shown in FIG. 5 and FIG. 6, the stop device 80 includes detectors 81A and 81B that detect the tilt of the tabletop 2. Each detector 81A and 81B functions as the stop device 80 in cooperation with a control unit that controls the driving of the extension unit 6 of the support structure 3. When one or more detectors 81A and 81B detect the tilt of the tabletop 2, the stop device 80 stops the extension and contraction operation of the extension unit 6. The detectors 81A and 81B are gyro sensors. The detectors 81A and 81B are arranged at intervals in the short direction of the tabletop 2. The detector 81A is supported by the left tilting member 70. The detector 81B is supported by the right tilting member 70. Each detector 81A and 81B is arranged between the bottom plate 71 of the tilting member 70 and the tabletop body 50, and is supported on the upper surface of the bottom plate 71 so as not to be displaced relative to each other. The detectors 81A and 81B are provided closer to the front end of the tabletop 2 than the top of the expandable portion 6 of the support structure 3. Furthermore, the detectors 81A and 81B are provided closer to the front end of the tabletop 2 than the reinforcing portion 68. The detectors 81A and 81B are provided at the middle position of the tilting member 70 in the longitudinal direction of the tilting member 70. This is for the purpose of making it easier to detect the tilting of the tilting member 70 caused by contact with another object at any position in the longitudinal direction of the tilting member 70. The detectors 81A and 81B detect the angular velocity associated with the tilting of the bottom plate 71. The detectors 81A and 81B detect not only the tilting of the entire tabletop 2 but also the tilting of the bottom plate 71 independent of the tabletop main body 50. The detection results of the detectors 81A and 81B are output to the control unit.

[0059] As described above, the tabletop lifting fixture 1 of this embodiment is supported by the support structure 3 so as to be displaceable in the vertical direction, and includes a tabletop 2 located between the center of gravity G and the rear end, and having a joint part 69 joined to the extension part 6. The front end side region 2f between the center of gravity G and the front end of the tabletop 2 is disposed in a position that does not overlap with the ground part 5 when viewed from the vertical direction. The tabletop 2 is provided with a stop device 80 that detects contact between the tabletop 2 and another object and stops the extension and contraction of the extension part 6. According to this configuration, the tabletop 2 is cantilevered by the support structure 3, and the ground part 5 of the support structure 3 does not exist below the front end side region 2f near the free end of the tabletop 2, making it easier to place other objects such as a cart below the tabletop 2. Furthermore, when the descending tabletop 2 comes into contact with another object placed below the tabletop 2, the descent of the tabletop 2 can be stopped by the stop device 80. Therefore, the convenience of the liftable tabletop fixture 1 can be improved by preventing an object from being caught between the tabletop 2 and the floor surface F while allowing the object to be placed below the tabletop 2.

[0060] The stop device 80 is provided closer to the front end of the tabletop 2 than the coupled portion 69. With this configuration, the stop device 80 is provided at a location on the tabletop 2 that is likely to come into contact with other objects when the tabletop 2 is lowered, making it easier to detect contact between the lowering tabletop 2 and other objects.

[0061] The tabletop 2 is provided with a reinforcing portion 68 that is provided in the rear end region 2r between the center of gravity G and the rear end and that increases the rigidity of the rear end region 2r relative to the front end region 2f. The stop device 80 is provided closer to the front end of the tabletop 2 than the reinforcing portion 68. According to this configuration, since the tabletop 2 is supported by a cantilever, it is necessary to reinforce the peripheral portion of the joined portion 69 closer to the rear end of the tabletop 2. However, if a reinforcing structure is provided over the entire length of the tabletop 2 in the front-rear direction, the weight of the tabletop 2 increases, which is inconvenient for the operability of the tabletop 2. Therefore, by utilizing the fact that the rigidity of the front end region 2f is relatively low by providing the reinforcing portion 68 only in the rear end region 2r, the stop device 80 is provided in the front end region 2f, which is more likely to tilt than the rear end region 2r, and it is possible to more easily detect contact between the descending tabletop 2 and other objects.

[0062] The tabletop 2 has a first length along the front-rear direction and a second length along the left-right direction that is shorter than the first length. With this configuration, the longitudinal direction of the planar shape of the tabletop 2 is along the front-rear direction, so the tabletop 2 is formed long from the joined portion 69 toward the front end. This makes it easier for other objects to be present below the tabletop 2, making it possible to provide an optimal configuration that achieves the above-mentioned effects.

[0063] The stop device 80 includes detection units 81A and 81B that detect the tilt of the tabletop 2. For example, when the detection unit is a contact sensor or a pressure sensor, it is necessary to provide the detection unit within a range where the influence of the tabletop touching other objects spreads, and the number of detection units needs to be increased as the tabletop becomes larger in the horizontal direction so that the contact of other objects can be detected regardless of where the tabletop 2 is touched by the other objects. According to this embodiment, the tilt of a specific member on the tabletop 2 spreads to the entire specific member, and is detected by one of the detection units 81A and 81B provided on the specific member. Therefore, since it is sufficient to provide one detection unit 81A and 81B for the member whose tilt is to be detected, the increase in the number of detection units 81A and 81B can be suppressed even if the tabletop 2 is enlarged, and the complication of the structure of the tabletop lifting fixture 1 and the increase in manufacturing costs due to the increase in the detection units 81A and 81B can be avoided.

[0064] The tabletop 2 includes a tabletop main body 50 that forms the upper surface of the tabletop 2, and a tilting member 70 that is displaceable relative to the tabletop main body 50 and has a lower surface 71b that faces the floor surface F. The detection units 81A, 81B are provided on the tilting member 70. According to this configuration, the tilting member 70, which is disposed at a position on the tabletop 2 that is likely to come into contact with an object present below it, is displaceable relative to the tabletop main body 50. Therefore, by providing the detection units 81A, 81B on the tilting member 70, contact between the tabletop 2 and other objects can be detected even if the tabletop main body 50 does not tilt sufficiently. Therefore, it is possible to more easily detect contact between the descending tabletop 2 and other objects.

[0065] The tilting member 70 is supported at one end by the tabletop body 50. With this configuration, it is easier to tilt the tilting member 70 compared to a configuration in which the tilting member is supported at both ends. Therefore, it is easier to detect contact between the descending tabletop 2 and another object.

[0066] The tilting member 70 may have a longitudinal direction along the front-rear direction. With this configuration, other objects are likely to be present below the tabletop 2 that is formed long in the front-rear direction, and since the tilting member 70 is also formed long in the front-rear direction, when the tabletop 2 descends, the tilting member 70 is more likely to come into contact with other objects present below the tabletop 2. Therefore, it is possible to more easily detect the contact between the descending tabletop 2 and other objects.

[0067] The tilting member 70 includes a flat bottom plate 71 having a lower surface 71b as one main surface. With this configuration, the tilting member 70 is easily bent when another object comes into contact with the bottom plate 71 from below. Therefore, it is possible to more easily detect the contact between the descending top plate 2 and another object.

[0068] Second embodiment FIG. 8 is a perspective view of the liftable tabletop fixture according to the second embodiment, showing a state in which the tabletop body 50 has been removed. A second embodiment of the lift-top type fixture 1A will be described with reference to Fig. 8. The second embodiment of the lift-top type fixture 1A differs from the first embodiment of the lift-top type fixture 1 in the arrangement of the detection unit. Note that the configuration other than that described below is the same as the first embodiment.

[0069] As shown in FIG. 8, the stopping device 80A has a pair of detection parts 81C, 81D provided on the right-side tilting member 70 and a detection part 81E provided on the rear end cover 58, instead of the single detection part 81B provided on the right-side tilting member 70 in the first embodiment. The detection units 81C and 81D are disposed between the bottom plate 71 of the tilting member 70 and the tabletop body 50, and are supported on the top surface of the bottom plate 71 so as not to be displaceable relative to each other. The detection units 81C and 81D are disposed on both sides of the notch 76 in the longitudinal direction of the right-side tilting member 70. The detection unit 81C is disposed in a region closer to the front end of the tilting member 70 than the notch 76. The detection unit 81C is provided closer to the front end of the tabletop 2 than the upper part of the extension / contraction part 6 of the support structure 3. The detection unit 81C is provided closer to the front end of the tabletop 2 than the reinforcement part 68. The detection unit 81C is provided at a middle position in the longitudinal direction of the tilting member 70, in a region closer to the front end of the tilting member 70 than the notch 76 in the tilting member 70. On the other hand, the detection unit 81A is provided at a middle position in the longitudinal direction of the tilting member 70, as in the first embodiment. That is, when the length of the tilting member 70 in the front-rear direction is the same as that in the first embodiment, the detection unit 81C is located closer to the front end of the tabletop 2 in the front-rear direction than the detection unit 81A. The detection unit 81D is located in a region on the rear end side of the tilting member 70 than the notch 76. By providing the detection unit 81C and the detection unit 81D in both front-rear regions on the tilting member 70 sandwiching the notch 76 in this way, for example, when another object comes into contact with a portion of the tilting member 70 behind the notch 76, the resulting tilt of the tilting member 70 is not transmitted forward from the notch 76, and the detection unit 81C does not operate. Since the detection unit 81D is provided at a middle position in the front-rear direction in the region on the rear end side of the tilting member 70 behind the notch 76, it is easy to detect the occurrence of the tilt of the tilting member 70 caused by the contact with another object, regardless of the position in the front-rear direction in the region on the rear end side of the tilting member 70. The detection unit 81E is disposed between the bottom wall of the rear end cover 58 and the top board main body 50, and is supported on the upper surface of the bottom wall of the rear end cover 58 so as not to be displaceable relative to the top board 2. The detection unit 81E is provided closer to the rear end of the top board 2 than the reinforcing portion 68 of the support frame 55.

[0070] In this embodiment, the same effect as in the first embodiment is achieved. In addition, in this embodiment, the detection unit 81E is provided on the rear end cover 58 arranged above the storage housing 4. When another object comes into contact with the rear end cover 58, the rear end cover 58 can be tilted independently of the top board main body 50 and the support frame 55 due to the elastic deformation of the rear end cover 58 itself. For example, when an object comes into contact with the bottom wall portion of the rear end cover 58 from below, the bottom wall portion is elastically deformed so that each portion of the bottom wall portion is inclined. Therefore, when the rear end cover 58 comes into contact with another object placed on the storage housing 4 while the top board 2 is descending, the descent of the top board 2 can be stopped by the stop device 80A. Therefore, the convenience of the top board lifting type furniture 1A can be improved by making it possible to place an object between the top board 2 and the storage housing 4 while suppressing the object from being caught between the top board 2 and the storage housing 4.

[0071] The present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope of the present invention. For example, in the above embodiment, the support structure 3 is fixed to the foundation floor B, but the support structure 3 may also be fixed to the upper floor panel P of a double floor, or to a single floor.

[0072] In the above embodiment, the stretchable portion 6 and the ground contact portion 5 are provided as separate members and are joined together to form an integrated unit, but the present invention is not limited to this configuration. In other words, the stretchable portion and the ground contact portion may be integrated together so as not to be detached from each other.

[0073] In the above embodiment, the tabletop 2 is cantilevered at a location near one end in the longitudinal direction, but this is not limited to the above configuration. The tabletop may be cantilevered at a location near one end in the lateral direction. In other words, the second length of the tabletop defined in the above embodiment may be greater than the first length.

[0074] In the above embodiment, the tabletop 2 includes a support frame 55 that supports the tabletop main body 50 from below, but is not limited to this configuration. The tabletop may not include a support frame, and the tabletop main body may be directly supported from below by a support structure.

[0075] In the above embodiment, the tilting member 70 is indirectly supported at one end by the tabletop body 50 via the support frame 55, but the present invention is not limited to this configuration. The tilting member may be directly supported at one end by the tabletop body.

[0076] In the above embodiment, the detection units 81A to 81D are disposed on the tilting member 70, but the detection units can be disposed at any location on the tabletop. However, it is preferable that the detection units are disposed on a member that can tilt with respect to the tabletop body. As a result, even if an external force is applied to the tabletop body that is relatively heavy and firmly supported by the support structure and does not tilt when the tabletop comes into contact with another object, if the other object comes into contact with the member that can tilt with respect to the tabletop body, the detection units can accurately detect the tilt of the tabletop. It is more preferable that the detection units are provided on a member of the tabletop that faces the floor surface. As a result, the detection units are disposed at a position on the tabletop that is likely to come into contact with an object present below it, so that it is possible to more easily detect the contact between the descending tabletop and another object.

[0077] For example, the detection unit may be disposed on a flat tilting member (e.g., a front end cover) that has a lower surface facing the floor surface F and is supported at both ends by a support frame or the like. Even with this configuration, the tilting member bends and tilts when another object comes into contact with the tilting member, so that the detection unit can detect the tilting of the tabletop.

[0078] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate. [Explanation of symbols]

[0079] Reference Signs List 1, 1A... Lift-type tabletop fixture 2... Tabletop 2f... Front end area (second end area) 2r... Rear end area (first end area) 3... Support structure 5... Grounding section 6... Expandable section 50... Tabletop body 68... Reinforcement section 69... Joint section 70... Tilting member 71b... Underside 80, 80A... Stopping device 81A, 81B, 81C, 81D... Detection section G... Center of gravity

Claims

1. A support structure having a grounding portion that is grounded on a floor and an expandable portion that is expandable in the vertical direction; a top plate supported by the support structure so as to be displaceable in the vertical direction, having a first end and a second end spaced apart in a horizontal first direction, and a coupled portion located between a center of gravity and the first end and coupled to the extendable portion; a second end side region of the top plate between the center of gravity and the second end is disposed at a position not overlapping with the ground part when viewed from the up-down direction; The tabletop is provided with a stop device that detects contact between the tabletop and another object and stops the extension and retraction operation of the extension and retraction unit. Display rack with liftable top.

2. At least a portion of the stop device is provided closer to the second end than the coupled portion. A liftable display fixture as described in claim 1.

3. the top plate includes a reinforcing portion provided in a first end side region between the center of gravity and the first end, the reinforcing portion increasing rigidity of the first end side region relative to the second end side region, The stop device is provided closer to the second end portion than the reinforcing portion. A liftable display fixture as described in claim 1.

4. The top plate is a first length along the first direction; a second length along a horizontal second direction perpendicular to the first direction, the second length being smaller than the first length; having A liftable display fixture as described in claim 1.

5. The stop device includes a detection unit that detects the tilting of the tabletop. A liftable display fixture as described in claim 1.

6. The top plate is A top plate body forming an upper surface of the top plate; a tilting member that is provided displaceably with respect to the tabletop body and has a lower surface that faces a floor surface; Equipped with The detection unit is provided on the tilting member. A liftable display fixture as described in claim 5.

7. The tilting member is cantilevered relative to the tabletop body. A liftable display fixture as described in claim 6.

8. The top plate is a first length along the first direction; a second length along a horizontal second direction perpendicular to the first direction, the second length being smaller than the first length; having The tilting member has a longitudinal direction along the first direction. A liftable display fixture as described in claim 6.

9. The tilting member is in the shape of a flat plate with the lower surface being one of its main surfaces. A display unit with a liftable top as described in any one of claims 6 to 8.

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