table

Abstract

To disclose a structure allowing a buffer member to be firmly fixed while reducing a vertical pitch of a table at stacking as much as possible with respect to a table capable of being stacked.SOLUTION: A table comprises a top board 1, and left and right front legs 2 and rear legs 3, 4 supporting the board. An upper frame 6 is integrally connected to the front and rear legs 2, 3, 4, and a bracket board 7 welded to the upper frame 6 is fixed to the top board 1 by screws. A buffer member 11 to be a spacer at stacking is fixed to the lower face of the bracket board 7. The buffer member 11 has a pair of foot parts 11a so as to straddle the upper frame 6, and the screws 12 inserted into the bracket board 7 from above are screwed into the foot parts 11a. Due to that female screw holes 13 of the buffer member 11 can be set at a height capable of securing a sufficient catching margin for the screws 12, the buffer member 11 can be firmly fixed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a stackable table. [Background technology]

[0002] Stackable tables are disclosed in, for example, Patent Documents 1 to 5. In all of them, the tables are equipped with two front legs on the left and two rear legs on the left and right, with the spacing between the front legs and the rear legs made different, and the left-to-right width of the table top made smaller than the dimension between the legs with the larger spacing, allowing multiple tables to be fitted together one behind the other.

[0003] Generally, the rear legs located on the user's side are set to extend outward on the left and right sides of the table top, and when stacking, a person stands in front of the table, lifts the table, and fits it onto the table placed behind it from above.

[0004] Each leg is generally made of a circular or other metal pipe material, and an upper frame is bent and formed at the top end of each leg to overlap the underside of the tabletop, and the upper frame is then fixed to the tabletop, but there are many variations in the fixing structure between the legs and the tabletop.

[0005] For example, in Patent Document 1, an upper frame (leg attachment portion) connected to the left and right rear legs (front legs in the publication) located on the user's side is formed in a U-shape in plan view, and this upper frame is fixed to the tabletop, while the upper ends of the left and right front legs (rear legs in the publication) are connected by a single upper frame, and the front legs and rear legs are connected by a connecting portion, so that when stacking, the connecting portion of the table located on the upper level rests on the tabletop of the table located on the lower level. A contact member (buffer member) that comes into contact with the tabletop when stacking is attached to the underside of the connecting portion.

[0006] In Patent Document 2, the left and right front legs and the left and right rear legs are integrally connected to the left and right longitudinal upper frames, respectively, so that the left and right front legs and the front upper frames, and the left and right rear legs and the rear upper frames, respectively, form a gate-like shape when viewed from the front. The front and rear upper frames are connected by longitudinal front and rear connecting members, and a cushioning member that comes into contact with the upper surface of the top plate when stacked is attached to the underside of the connecting member. Patent Document 5 has a similar structure to Patent Document 2.

[0007] In Patent Document 3, the left and right front legs and the left and right rear legs are integrally connected to the left and right longitudinal upper frames, respectively, and the left and right front legs are connected by a front member that is shaped like an open-ended downward character when viewed from the front, and the vertical portions at both ends of the front member form the ground contact portions of the front legs. Therefore, Patent Document 3 has a complex frame structure. In Patent Document 3, a longitudinal support portion that functions as a buffer member when stacking is fixed to the underside of the top plate.

[0008] In Patent Document 4, each leg has an inverted L-shape with an upper frame bent inward at its upper end, and the upper frame is fixed to the tabletop. In Patent Document 4, the front and rear upper frames are connected by cross members, and shock absorbers are attached to the undersides of the cross members. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-95531 [Patent Document 2] Japanese Patent Application Publication No. 2019-83981 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-54851 [Patent Document 4] Japanese Patent Application Laid-Open No. 2016-83239 [Patent Document 5] Microfilm of Utility Model Publication No. 05-21731 Summary of the Invention [Problem to be solved by the invention]

[0010] Now, in stackable tables, a cushioning material is essential to prevent the tabletop from being damaged by stacking, and each patent document provides a cushioning material for this purpose. However, the method of fixing the cushioning material to the underside of the tabletop, as in Patent Document 3, has the problem that processing the tabletop becomes complicated.

[0011] On the other hand, while other patent documents do not have any problems with the processing of the tabletop, in the method of attaching shock absorbers to members connected to the front and rear legs as in Patent Document 1, there is a problem even before the installation of the shock absorbers, in that the vertical spacing between the tables becomes large when stacked, which raises the center of gravity of the table group when stacked and reduces stability.

[0012] In contrast to this, in Patent Documents 2, 4, and 5, because components that are in close contact with the underside of the tabletop, such as the bent portions at the top ends of the legs or the connecting members, are placed on the top surface of the tabletop positioned below, the vertical gap when stacking can be reduced, improving stability, and the cushioning members provided on the connecting members, etc. can prevent the top surfaces of the tabletops from being damaged when stacked. In addition, the tabletops are stacked in a state of being supported at four points, which provides good stability.

[0013] Therefore, when we look at the means for attaching the buffer member, it is assumed that the rubber protrusion 5 in Patent Document 5 is attached to the connecting member (prism-shaped member) by utilizing elastic deformation. In this case, there is a risk of it falling off. is at stake I feel sorry for him.

[0014] Furthermore, the buffer members in Patent Documents 2 and 4 are presumably attached by screwing a screw into a connecting member or the like from below. In this case, a female thread is formed in the connecting member or the like. However, since connecting members or the like are usually made of pipe material, there is a concern that the female thread may be crushed if the screw is screwed in too tightly.

[0015] Furthermore, the cushioning member needs to have a certain amount of surface area on its underside to reduce the contact pressure with the top plate, but in a configuration in which the screws are inserted into the cushioning member from below, it is necessary to form a countersink in the underside of the cushioning member so that the head of the screw is hidden, and so there is a risk that the cushioning member will become larger than necessary in order to secure the necessary surface area on its underside.

[0016] The present invention has been made to improve this current situation. [Means for solving the problem]

[0017] The table of the present invention is as follows: " A top plate having a rectangular shape in plan view, Support from below It has left and right front legs and left and right hind legs, The distance between the left and right front legs is different from the distance between the left and right rear legs, and the left and right width of the tabletop is made smaller than the distance between the legs with the larger left and right distance, thereby enabling stacking of multiple units. It is now possible, and moreover, During the stacking The top plate and Located below Located between other tops Cushioning material It is equipped with In this basic configuration, "The buffer member and a female screw hole into which a screw for disposing the buffer member on the underside of the top plate is screwed from above is provided either directly or via a nut. " It has the following characteristics.

[0018] The present invention can be embodied in various ways. For example, in claim 2, in claim 1, "The female screw hole is Below Not penetrating 」 The invention of claim 3 is the same as claim 1, "The female threaded hole is formed by the nut, The nut is buried in It is set up.” The structure is as follows.

[0019] The invention of claim 4 is any one of claims 1 to 3, 「 An upper frame connected to the upper ends of the legs is fixed to the underside of the top plate. R, before The cushioning member is By the above-mentioned The upper frame Mu's It's fixed to the bottom This is the configuration to It has become. The buffer material must be installed in four places: front, back, left and right. When a bracket plate is provided as in claims 5 and 6, When all buffer members are located below the bracket plate and and a case where a part of the buffer member is located below the bracket plate.

[0020] As a dependency of claims 4 to 6, claim 7: "A hole is formed on the underside of the top plate to allow the head of the screw to fit in." This is the configuration can be adopted .

[0021] Claim 5 The invention is, in any one of claims 1 to 3, "A bracket plate welded to the upper frame connected to the upper end of the legs is fixed to the underside of the tabletop, The buffer member is fixed to the lower surface of the bracket plate with the screws. The structure is as follows. As a specific example of the upper frame and bracket plate, 「 The left and right upper frames are each made of a pipe material, and are bent into a first portion that is long in the depth direction and extends parallel to each other, and a second portion that is inclined so that the distance between them increases, and the front legs are bent and formed at one end of the first portion, and the rear legs are bent and formed at the other end of the second portion, Furthermore, the bracket plate is fixed by welding to two locations, the front end and the rear end of the upper frame, with the bracket plate at the rear end overlapping both the first portion and the second portion of the upper frame, and the buffer members are fixed to the front and rear bracket plates. This is the configuration can be adopted.

[0022] Claim 6 The invention is as follows: 3 In any of the The buffer member is formed in a U-shape having a pair of legs that contact the bracket plate on both sides of the upper frame, and the legs are respectively attached to the bracket plate. The aforementioned It's fixed with screws The structure is as follows. The invention of claim 7 is any one of claims 4 to 6, "A hole is formed on the underside of the top plate to allow the head of the screw to fit in." The structure is as follows. [Effects of the Invention]

[0023] Claims 4 to 7 In the , the upper frame is fixed to the top plate, so when stacking multiple units, the vertical gap between the tables can be made as small as possible, improving stability when stacking. or bracket plate The shock absorber is fixed to the upper frame with a screw inserted from above, and the female thread that the screw engages with is formed in the shock absorber, but the thickness (height) of the shock absorber can be set as desired, so the female thread can be formed to the required length. Therefore, the shock absorber can be attached to the upper frame without the female thread being crushed. and bracket plate Therefore, it is highly reliable.

[0024] In addition, because the female screw does not need to open on the underside of the cushioning member, the cushioning member can be made as small as possible while still maintaining the necessary contact area with the tabletop. Therefore, the cushioning member can be prevented from becoming too large and costly while still providing sufficient cushioning function for the tabletop. Furthermore, because the cushioning member cannot be removed while the upper frame is fixed to the tabletop, accidental removal of the cushioning member can also be prevented.

[0025] In Patent Documents 1, 2, 3, and 5, the stability of the tabletop is ensured by constructing a frame structure in which each leg and the upper frame are connected as a whole. However, this configuration has problems such as increased costs due to the complex shape of the frame structure, and because if the tabletop has different left-right widths, a frame structure must be manufactured accordingly, which increases costs when offering a range of tables with different left-right widths.

[0026] In contrast, Claims 5 and 6 By adopting this configuration, the bracket plate can ensure stable support for the tabletop, allowing the frame structure to be simplified while still maintaining the strength required for the table. This also helps reduce costs. Furthermore, since the left and right legs do not necessarily need to be connected, the left and right frame structures can be constructed separately, making it easy to use them for tabletops of different widths. Therefore, when offering a lineup of multiple types of tables with different tabletop widths, standardizing components can contribute to overall cost reduction.

[0027] And claims 5,6 In the above case, both the bracket plate and the buffer member have the function of supporting the top plate, and therefore can be arranged in the same position in a plan view. 6 When the buffer member is fixed to the underside of the bracket plate as shown in FIG. 1, there is no need to drill screw insertion holes in the upper frame, and therefore the strength of the upper frame can be improved.

[0028] Claim 5,6 In the case of claim 1, it is possible to use a countersunk head screw as the screw and to drill a countersunk hole in the bracket plate into which the countersunk head of the screw can fit. 7 When the above configuration is adopted, there is no need to perform any special processing on the bracket plate, and it is sufficient to form a relief hole in the top plate, which is easy to process, so it is advantageous in terms of processing. Also, if the bracket plate has a counterbore hole, the front and back directions of the bracket plate become apparent, so when welding it to the upper frame, it is necessary to check the front and back each time and set it in the jig. 7 Since the bracket plate does not have a front or back orientation, the effort required for welding can be reduced and work errors can be prevented.

[0029] The bracket plate and the upper frame are described as specific examples in claim 5.When this configuration is adopted, the left support section, consisting of the left front and rear legs and the left upper frame, is formed by bending a single piece of pipe material, and the right support section, consisting of the right front and rear legs and the right upper frame, is formed by bending a single piece of material. Because the left and right support sections are separate, one type of support section can be shared by multiple types of tables with tabletops of different widths. Therefore, when offering a lineup of tables with different widths, the overall number of types of materials can be reduced, thereby reducing costs.

[0030] The left and right support sections have a simple structure, consisting of a single bent pipe with bracket plates welded to the upper frame, but because the first and second sections that make up the upper frame are bent, they provide excellent support stability for the tabletop. This simplifies the structure, keeping costs down while ensuring robustness.

[0031] Furthermore, because the bracket plates are fixed to the first and second parts, which have different postures when viewed from above, the first and second parts that make up the upper frame have significantly improved resistance to bending and twisting.As a result, each leg also exhibits high resistance to horizontal loads, achieving high support strength despite its simple structure.

[0032] On the other hand, it is necessary and sufficient to place the buffer members in four places, front, back, left and right, and from the viewpoint of stability, it is preferable to place the buffer members in a row in front and back. 4 Since the four buffer members are fixed to the bracket plate, there is no need to drill holes in the upper frame, which improves its strength.

[0033] Claim 6 When the above configuration is adopted, the buffer member is fixed to the bracket plate by a pair of screws, so that the buffer member can be firmly fixed. [Brief explanation of the drawings]

[0034] [Figure 1] 1A and 1B are diagrams showing a first embodiment, in which (A) is a perspective view seen from the rear, (B) is a side view, (C) is a perspective view seen from the front below, and (D) is a perspective view seen from the rear below. [Figure 2] (A) is an exploded perspective view seen from below, (B) is a bottom view, (C) is a cross-sectional view taken along CC in (B), and (D) is a cross-sectional view taken along DD in (B). [Figure 3] The figures show the tables arranged side by side, front to back and left to right, with (A) being a perspective view from below and (B) being a bottom view. [Figure 4] 1A and 1B are diagrams showing the stacked state, in which (A) is a perspective view seen from the rear, (B) is a side view, and (C) is a perspective view seen from the rear and below. [Figure 5] 10A and 10B are diagrams showing a second embodiment, in which (A) is a perspective view seen from below, and (B) is a bottom view. [Figure 6] 10A and 10B are diagrams showing a second embodiment, in which (A) is a partially separated perspective view seen from below, and (B) is a perspective view of a buffer member. [Figure 7] 1A and 1B are diagrams showing the structure of a caster, in which (A) is a side view, (B) is an exploded perspective view, and (C) is a cross-sectional plan view of (A) taken along the line B-B. DETAILED DESCRIPTION OF THE INVENTION

[0035] Next, an embodiment of the present invention will be described with reference to the drawings. Hereinafter, the terms "front, back," "left," and "right" will be used to specify directions, but these terms are based on the state seen by a person who normally uses the table. Therefore, taking the tabletop as an example, the part farthest from the user is the front, and the part closest to the user is the back.

[0036] (1).Basic structure First, a first embodiment shown in Figures 1 to 4 will be described. The table has a horizontally long rectangular top board 1 and four legs 2, 3, and 4 supporting it, with casters 5 attached to the bottom ends of each of the legs 2, 3, and 4. The top board 1 is basically made of wood, and a decorative panel made of melamine resin or the like can be placed on the surface. It is also possible to attach a border member (edge ​​material) to the outer periphery.

[0037] Each leg 2, 3, 4 is made of a steel pipe (metal pipe), and the left and right front legs 2 are positioned inside the side end face of the tabletop 1, while the rear legs 3, 4 extend outside the tabletop 1 on the left and right. Due to this relationship between the legs 2, 3, 4 and the tabletop 1, multiple tables can be stacked by fitting them together in the front-to-back direction, as shown in Figure 4.

[0038] As shown in Figure 2(B), the left and right front legs 2 are positioned in the same front-to-rear position, but the left rear leg 3 and the right rear leg 4 are shifted in the front-to-rear direction. By shifting the left and right rear legs 3, 4 forward and backward in this way, multiple tables can be placed side by side with the side end faces of the table tops 1 abutting against each other, as shown in Figure 3. In the illustrated example, the left rear leg 3 is positioned forward of the right rear leg 4, but the relationship may be reversed.

[0039] 1(C)(D), for example, the front leg 2 and the rear legs 3, 4 are connected integrally via an upper frame 6 that overlaps the underside of the tabletop 1. That is, the left front leg 2 and rear leg 3, and the right front leg 2 and rear leg 4, are each made by bending a single metal pipe into a roughly U-shape. Corresponding to the rear legs 3, 4 extending outward from the left and right sides of the tabletop 1, the upper frame 6 is bent with a first portion 6a that is long in the depth direction and extends parallel to each other, and a second portion 6b that is inclined so that the distance between them increases. The front leg 2 hangs downward from the front end (one end) of the first portion 6a, and the rear legs 3, 4 hang downward from the rear end (other end) of the second portion 6b.

[0040] A bracket plate 7 made of a metal plate such as a steel plate is fixed by welding to the upper surface of the front part of the first portion 6a of the upper frame 6 and to the upper surface of the second portion 6b, and the four corners of the bracket plate 7 are fixed to the underside of the top plate 1 with first screws 8 (see FIG. 2(C)). Therefore, in the parts of the upper frame 6 that are not overlapped by the bracket plate 7, there are gaps with a distance equal to the plate thickness of the bracket plate 7. A countersunk nut 9 into which the first screw 8 is screwed is fitted to the underside of the top plate 1. The bracket plate 7 is formed in a quadrilateral (square) shape when viewed from above.

[0041] The table is provided with a back panel 10 arranged to overlap the front of the front legs 2. has a structure in which a core board is covered with a bag-shaped skin material, and at the top end, a horizontal portion 10a is formed with a reinforcing plate such as a resin plate sewn to it, and the horizontal portion 10a is fixed to the underside of the table top 1 with screws (not shown). Magnets are built into the lower ends of the left and right ends of the back panel 10, and by magnetically attaching the magnets to the front legs 2, flapping is prevented. In addition, a table user may kick the back panel 10 with their foot, in which case the magnetic attachment is released and the back panel 10 rotates forward, preventing damage to the back panel 10.

[0042] For example, as shown in FIG. 1(C), one of the left and right upper frames 6 is provided with a hook F for hanging an article such as a bag.

[0043] (2) Cushioning member of the first embodiment For example, as shown in Figure 2(B), cushioning members 11 are arranged on the underside of the front and rear ends of the first portion 6a constituting the upper frame 6, and come into contact with the top plate 1 located below during stacking. The cushioning members 11 are made of synthetic resin such as polypropylene, and the cushioning member 11 located at the front overlaps the bracket plate 7 in plan view. The cushioning members 11 are elongated in the front-to-rear direction, and their upper surfaces form arcuate grooves that open upward so as to overlap the first portion 6a of the upper frame 6. Therefore, in this embodiment, the cushioning members 11 overlap only the first portion 6a of the upper frame 6, and do not overlap the bracket plate 7.

[0044] 2(C), the buffer member 10 located at the front is fixed to the first portion 6a of the upper frame 6 by a second screw 12 that penetrates the bracket plate 7 and the first portion 6a from above, and the buffer member 10 located at the rear is fixed to the first portion 6a by a second screw 12 that penetrates the first portion 6a from above. Therefore, a female screw 13 is formed in the buffer member 10. It is also possible to attach a nut to the buffer member 10 by insert molding or the like, and then screw the second screw 12 into this nut.

[0045] The head 12a of the second screw 12 that secures the buffer member 11 located at the front is exposed above the bracket plate 7. That is, the bearing surface of the head 12a of the second screw 12 overlaps the upper surface of the bracket plate 7. For this reason, the top plate 1 has an escape hole 14 through which the head 12a of the second screw 12 fits. On the other hand, the head 12a of the first screw 12 that secures the buffer member 11 located at the rear overlaps the first part 6a of the upper frame 6 from above, and in this case too, the top plate 1 has an escape hole 14 through which the head 12a of the second screw 12 fits.

[0046] In the illustrated example, the head of the second screw 12 is pan-shaped, but if a screw with a flat head that is thinner than the thickness of the bracket plate 7 is used, the relief hole 14 at the rear buffer member 11 can be eliminated. Also, if a relief hole that is thinner than the thickness of the bracket plate 7 is formed in the bracket plate 7 so that the head 12a of the second screw 12 can fit in, there will be no need to form the relief hole 14 in the top plate 1.

[0047] As can be seen from Figure 2(C), the front-to-rear center position of the front-positioned buffer member 11 is shifted slightly forward from the line connecting the centers of the left and right first screws 8. On the other hand, the female screw hole 13 is formed in the front-to-rear center position of the buffer member 11. Therefore, at the location of the front-positioned buffer member 11, the first screw 8 and the second screw 12 are slightly shifted forward and backward, but for convenience, in Figure 2(C), the first screw 8 and the second screw 12 are shown aligned in a row.

[0048] (3) Summary The cushioning member 11 is fixed to the upper frame 6 by a screw inserted from above, and therefore a female screw hole 13 is formed in the cushioning member 11. However, there is no particular restriction on the height of the cushioning member 11, and the female screw hole 13 can be formed to a length (height) that can ensure a sufficient catch for the second screw 12, so the cushioning member 11 can be firmly fixed to the upper frame 6. Once fixed, the buffer member 11 cannot be removed, so the buffer member 11 will not be removed for any reason and can still perform its stacking function.

[0049] Furthermore, the underside of the cushioning member 11 is flat to prevent the contact pressure with the top plate 1 from becoming too high, but since the female screw hole 13 does not need to open downward, it is possible to ensure a flat surface of the required area on the underside while making it as small as possible. Therefore, the manufacturing cost of the cushioning member 11 can be reduced accordingly.

[0050] The four bracket plates 7 share the same type of screw. Therefore, the bracket plate 7 fixed to the second portion 6b of the upper frame 6 also has a hole for inserting the second screw 12. Furthermore, because the bracket plate 7 is symmetrical about the upper frame 6, it can be used upside down. In this case, if a countersunk screw is used as the second screw 12, it is necessary to form a tapered countersunk hole in the bracket plate 7. However, in this case, the bracket plate 7 will have a specific front and back orientation, so when welding the bracket plate 7 to the upper frame 6, it is necessary to check the orientation so that the countersunk hole is positioned at the top.

[0051] In contrast, when the head 12a of the second screw 12 in the embodiment is exposed, the screw insertion hole in the bracket plate 7 can be a straight hole that is simply punched out, so the bracket plate 7 no longer has a front-to-back orientation, which reduces the effort required for welding work.

[0052] If the head 12a of the second screw 12 is exposed above the bracket plate 7, it is necessary to drill a relief hole 14 in the top plate 1. However, considering the time required to drill a tapered countersink hole in the bracket plate 7 and the time required to check the position during welding, drilling a relief hole 14 in the top plate 1 is less of a burden. This is therefore advantageous in terms of quality and cost.

[0053] In the embodiment, the left support section is made up of the front and rear legs 2, 3 located on the left and the left upper frame 6, and the right support section is made up of the front and rear legs 2, 4 located on the right and the right upper frame 6, but because the left and right support sections are separate, one type of leg device can be shared by multiple second portions 6b with different left and right widths of the table top 1. Therefore, overall costs can be reduced when offering an assortment of multiple types of tables with different left and right widths.

[0054] Furthermore, the left and right support sections each have a simple structure in which a bracket plate 7 is welded to a frame body formed by bending a single metal pipe, thereby reducing overall costs. However, the upper frame 6 is bent and has the second portion 6b, so despite its simple structure, it has excellent support stability.

[0055] In particular, when the cushioning member 11 is arranged at the front end of the first part 6a and the second part 6b of the upper frame 6 as in the embodiment, the downward load acting on the tabletop 1 does not act as a bending moment or a torsional force on the first part 6a and the second part 6b, and therefore has high support strength and is highly robust.

[0056] Furthermore, because the bracket plate 7 is fixed to the upper frame 6 at a location close to the front and rear legs 2, 3, and 4, even if an external force acts on the table in the front-to-rear direction, no bending force acts on the upper frame 6. In this respect, too, a high level of strength can be ensured despite the simple structure.

[0057] (4) Second embodiment 5 and 6 show a second embodiment. In this embodiment, the structures of the legs 2, 3, 4 and the upper frame 6 are the same as those of the first embodiment, but the bracket plate 7, the buffer member 11, and the hook F are different from those of the first embodiment. First, regarding the hook F, in this embodiment, the hook F is fixed to the underside of the tabletop 1 with a screw.

[0058] Next, regarding the bracket plates 7, in this embodiment, the bracket plate 7 located in the front is fixed to the front part of the first part 6a, and the bracket plate 7 located in the rear is fixed to the corner part formed by the first part 6a and the second part 6b. In other words, the bracket plate 7 located in the rear is fixed across the first part 6a and the second part 6b.

[0059] In this embodiment, the rear bracket plate 7 straddles both the first portion 6a and the second portion 6b, which significantly improves the resistance of the second portion 6b to bending and twisting, thereby increasing the strength of the table as a whole.

[0060] Furthermore, the bracket plate 7 of this embodiment is larger than the bracket plate 7 of the first embodiment, and is fixed to the tabletop 1 at five locations, at the four corners and near the center, with first screws 8. In this respect, too, the fixing strength to the tabletop 1 is significantly higher. In relation to the upper frame 6, the upper frame 6 is positioned close to one side edge of the bracket plate 7.

[0061] The rear bracket plate 7 is offset significantly outward from the first portion 6a to increase the overlap with the second portion 6b, while the front bracket plate 7 is offset significantly inward in the left-right direction. In this way, the front and rear bracket plates 7 are offset in opposite directions, which increases the support stability of the tabletop 1.

[0062] Next, we will describe the cushioning member 11. As clearly shown in Fig. 6, the cushioning member 11 of this embodiment is substantially U-shaped so as to straddle the first portion 6a of the upper frame 6, and has left and right foot portions 11a that abut against the underside of the bracket plate 7. Second screws 12 that are inserted into the bracket plate 7 from above are screwed into the left and right foot portions 11a.

[0063] Therefore, unlike the first embodiment, there is no need to drill screw insertion holes in the first portion 6a of the upper frame 6, which improves the strength of the upper frame 6. Also, as shown in Fig. 6(A), nuts 11b are embedded by insert molding inside the foot portions 11a of the cushioning member 11. Although the nuts 11b are shown exposed in Fig. 6(A), this is for convenience, and the nuts 11b cannot be separated from the cushioning member 11.

[0064] As mentioned above, the front and rear bracket plates 7 are offset from the first portion 6a in opposite directions, but the buffer members 11 are both located near the front. Therefore, the same type of bracket plate 7 can be used for both the front and rear by flipping it over. To allow for reversible use, the second screws 12 are not flat head screws like pan head screws. Therefore, in this embodiment, the top plate 1 also has relief holes 14 into which the heads 12a of the second screws 12 can fit. In this embodiment, the screws 10b that secure the upper horizontal portion 10a of the back panel 10 are shown.

[0065] (5) Caster Description In this embodiment, improvements have also been made to the mounting structure of the casters 5. This will be explained with reference to Figure 7. The casters 5 are of a type that can also rotate horizontally, but the casters 5 attached to the rear legs 3, 4 can be locked to prevent rotation and horizontal rotation. For this reason, as shown in Figure 2(A), the casters 5 attached to the rear legs 3, 4 are provided with locking levers 16.

[0066] As shown in Figure 7, the caster 5 includes a support block 17 and a pair of rollers 18 rotatably held by a support shaft (shown), and a bolt (screw shaft) 19 protrudes upward from the support block 17. The bolt 19 is rotatably held in the support block 17 by a thrust bearing (not shown). A hexagonal head 20 is integrally formed at the bottom of the bolt 19.

[0067] Joints 21 are fitted to the lower parts of the legs 2, 3, and 4, and bolts 19 are threaded from below into female threaded holes 22 formed in the joints 21. The joints 21 have an upper boss portion 22 that is force-fitted into the insides of the legs 2, 3, and 4, a flange 24 located at the lower end of the upper boss portion 22 and abutting the lower surfaces of the legs 2, 3, and 4, and a lower boss portion 25 located below the flange 24. An outward annular protrusion 25a is formed at the lower end of the lower boss portion 25, while an inward protrusion 26a is formed at the upper end of the adjusting ring 26, and these are used to hold the adjusting ring 26 in place while allowing it to move up and down and rotate freely and not come loose.

[0068] A resin bolt holder 27 that is C-shaped in plan view is fitted into the lower part of the adjustment ring 26, and the bolt holder 27 holds the hexagonal head 20 of the bolt 19. The bolt holder 27 holds the hexagonal head 20 from above and below, but is formed C-shaped in plan view so that it can be fitted into the hexagonal head 20 from the horizontal direction. A lower flange 27b is provided that overlaps the underside of the hexagonal head 20, and an outward flange 27b is further formed on the outer periphery of the lower flange 27a.

[0069] The adjusting ring 26 holds the bolt holder 27, and the bolt holder 27 has engaging protrusions 28 at three circumferentially spaced locations on its outer periphery, while the adjusting ring 26 has engaging holes 29 that fit into the engaging protrusions 28, and the engaging protrusions 28 are forced into the engaging holes 28 by being pushed in from above. Therefore, the adjusting ring 26, bolt holder 27, and hex head 20 (bolt 19) are inseparable from above and rotate together as a unit.

[0070] A notch (not shown) is formed in the middle of the outward flange 27b to form the engagement protrusion 28. When the adjustment ring 26 is rotated, the bolt 19 rotates, and the height of the caster 5 can be adjusted.

[0071] The provision of an adjustable ring on a table caster is disclosed in Japanese Patent Application Laid-Open No. 2015-93499, which describes a configuration in which the adjustable ring surrounds the hexagonal head of the bolt from the outside, allowing the adjustable ring and the bolt to rotate together.

[0072] However, with the configuration of this prior art document, the adjustment ring simply fits onto the hexagonal head from above, which causes the adjustment ring to easily come off the hexagonal head. Also, because the bolt is rotatably held in the support block, there is a slight clearance between the bolt and the support block, which means that the downward load acting on the bolt acts strongly on the bottom surface of the support block, which could cause damage to the support block (a decrease in strength).

[0073] In contrast to this, in this embodiment, the bolt holder 27 holds the hexagonal head 20 from above and below, and the adjusting ring 26 is held so that it cannot move up and down relative to the bolt holder 27, so the adjusting ring 26 will never come off the hexagonal head 20, ensuring the height adjustment function of the caster 5.

[0074] Furthermore, since the bolt holder 27 is formed with an inward flange 27a located on the underside of the hexagonal head 20, by placing the inward flange 27a in contact with the upper surface of the support block 17, the load acting on the bolt 19 can be supported by the upper surface of the support block. This prevents the support block 17 from being poked by the lower end of the bolt 19, significantly improving the strength of the support block.

[0075] Although the embodiments of the present invention have been described above, the present invention can be embodied in various other ways. For example, the shock-absorbing member mounting structure of the present invention can be applied not only to a table with separate left and right support parts, but also to a table with a horizontally long upper frame connected to the left and right front legs. The upper frame and legs may also be made separately. [Industrial Applicability]

[0076] The present invention is applicable to stackable tables and is therefore industrially applicable. [Explanation of symbols]

[0077] 1 baking sheet 2 front legs 3,4 Hind legs 5 Caster 6 Upper frame 6a Part 1 6b Part 2 7 Bracket plate 8 First Vis 10. Curtain board 11. Cushioning material 11a Foot 12 Second Vis 12a Head of the second screw 13 Internal thread 14 Relief hole

Claims

1. A tabletop having a rectangular top plate in a plan view, and left and right front legs and left and right rear legs that support the tabletop from below, The distance between the left and right front legs is different from the distance between the left and right rear legs, and the left and right width of the table top is made smaller than the distance between the legs with the larger left and right distance, so that multiple units can be stacked. A table having a buffer member positioned between the top plate and another top plate positioned below it during the stacking, The buffer member is provided with a female screw hole into which a screw for disposing the buffer member on the underside of the top plate is screwed from above, either directly or via a nut. table.

2. The female screw hole does not penetrate downwardly through the buffer member.

2. The table of claim 1.

3. The female screw hole is formed by the nut, and the nut is embedded in the buffer member.

2. The table of claim 1.

4. An upper frame connected to the upper ends of the legs is fixed to the underside of the tabletop, The buffer member is fixed to the lower surface of the upper frame by the screws. A table according to any one of claims 1 to 3.

5. A bracket plate welded to an upper frame connected to the upper ends of the legs is fixed to the underside of the tabletop, The buffer member is fixed to the lower surface of the bracket plate with the screws. A table according to any one of claims 1 to 3.

6. The buffer member is formed in a U-shape with a pair of legs that abut against the bracket plate on both sides of the upper frame, and each of the legs is fixed to the bracket plate with the screws. A table according to claim 5.

7. A hole is formed on the underside of the top plate to allow the head of the screw to fit in. A table according to any one of claims 4 to 6.

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