Machine

Abstract

To provide a desk whose top plate is lightweight and easy to carry.SOLUTION: A desk is provided with a top plate 120 on a supporting leg rising from the floor surface. The top plate 120 is composed of a middle layer structure 121, an upper layer structure 130, and a lower layer structure 140. The middle layer structure 121 is formed into a flat annular shape in a rectangular shape in a planar view. The upper layer structure 130 is formed into a rectangular plate shape in a planar view and pasted onto an upper surface of the middle layer structure 121. The lower layer structure 140 is formed into a rectangular plate shape in a planar view and pasted onto a lower surface of the middle layer structure 121. Thus, one hollow part 123 which extends in a flat plate shape along a plate surface direction of the top plate 120 in the state it is closed with the upper layer structure 130 and the lower layer structure 140 is formed in the central part of the middle layer structure 121.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a desk particularly suitable for use as a learning desk for children and students in educational facilities such as schools.

Background Art

[0002] Conventionally, there has been a desk in which a plate-like top plate is provided on the upper part of support legs standing from the floor surface. For example, Patent Document 1 below discloses a desk as a learning desk in which the top plate is made of a laminated board of thinned wood.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] However, in the desk disclosed in Patent Document 1, since the top plate is solidly configured by a laminated board, there is a problem that it is heavy and difficult for children and students to carry around.

[0005] The present invention has been made to address the above problems, and an object thereof is to provide a desk in which the top plate is lightened and can be easily carried around.

Summary of the Invention

[0006] To achieve the above object, the features of the present invention are a desk including support legs standing from the floor surface, a top plate supported on the upper part of the support legs, and a connector that is inserted into the top plate through the support legs to connect the support legs and the top plate to each other. The top plate has one hollow portion that extends flat along the plate surface direction of the top plate inside the top plate and is formed in a hollow shape as a whole. The top plate has a middle layer structure formed in a flat plate ring shape surrounding the periphery of the hollow portion, an upper layer structure covering one surface of the middle layer structure to form the upper surface side of the top plate, and a lower layer structure covering the other surface of the middle layer structure to form the lower surface side of the top plate. The middle layer structure constitutes the outer peripheral portion of the top plate and the inner peripheral surface of the hollow portion.and is formed to have the highest rigidity with respect to the upper layer structure and the lower layer structure is to do so.

[0007] According to the features of the present invention configured as described above, since the desk has one cavity portion extending in a flat plate shape inside the top plate and is formed in a hollow shape as a whole, the top plate can be lightened and easily carried. Further, according to the present invention, since the desk is configured by sandwiching a middle layer structure formed in a flat plate annular shape surrounding the cavity portion between an upper layer structure and a lower layer structure in the vertical direction, it is possible to easily manufacture the top plate having the cavity portion. Further, according to the present invention, since the middle layer structure of the desk is formed to have the highest rigidity with respect to the upper layer structure and the lower layer structure, the shape of the cavity can be stably maintained and the deformation of the entire top plate over time can be suppressed.

[0008] To achieve the above object, the features of the present invention are a desk including support legs standing up from the floor surface, a top plate supported on the upper part of the support legs, and a connector inserted into the top plate through the support legs to connect the support legs and the top plate to each other, wherein the top plate has one cavity portion extending in a flat plate shape along the plate surface direction of the top plate inside the top plate and is formed in a hollow shape as a whole, and has a middle layer structure formed in a flat plate annular shape surrounding the cavity portion, an upper layer structure covering one surface of the middle layer structure and constituting the upper surface side of the top plate, and a lower layer structure covering the other surface of the middle layer structure and constituting the lower surface side of the top plate, and the middle layer structure is composed of a laminate in which a plurality of plate materials are laminated and is formed to have the highest rigidity with respect to the upper layer structure and the lower layer structure is in that.

[0009] According to the features of the present invention configured as described above, since the desk has one cavity portion extending in a flat plate shape inside the top plate and is formed in a hollow shape as a whole, the top plate can be lightened and easily carried. Further, according to the present invention, since the desk is configured by sandwiching a middle layer structure formed in a flat plate annular shape surrounding the cavity portion between an upper layer structure and a lower layer structure in the vertical direction, it is possible to easily manufacture the top plate having the cavity portion. Further, according to the present invention, since the middle layer structure of the desk is formed to have the highest rigidity with respect to the upper layer structure and the lower layer structure, the shape of the cavity can be stably maintained and the deformation of the entire top plate over time can be suppressed.

[0010] Further, another feature of the present invention is that in the above desk, The middle layer structure constitutes the outer peripheral portion of the top plate and the inner peripheral surface of the cavity is in that.

[0012] Also, another feature of the present invention is that, in the desk, the middle layer structure is formed to be the thickest with respect to the upper layer structure and the lower layer structure.

[0013] According to another feature of the present invention configured as described above, since the middle layer structure of the desk is formed to be the thickest with respect to the upper layer structure and the lower layer structure, the thickness of the cavity portion becomes the smallest inside the top plate, and the top plate can be effectively lightened.

[0014] Also, another feature of the present invention is that, in the desk, the middle layer structure is made of a material having at least one of insect-proof property and anti-corrosion property higher than that of the upper layer structure and the lower layer structure.

[0015] According to another feature of the present invention configured as described above, since the middle layer structure of the desk is made of a material having at least one of insect-proof property and anti-corrosion property higher than that of the upper layer structure and the lower layer structure, the intrusion of pests from the periphery of the cavity portion into the cavity portion and the corrosion of the periphery can be effectively suppressed.

[0016] Also, another feature of the present invention is that, in the desk, the lower layer structure is formed to be thinner than the upper layer structure.

[0017] According to another feature of the present invention configured as described above, since the lower layer structure of the desk is formed to be thinner than the upper layer structure, while suppressing a rapid temperature change inside the cavity portion through the upper layer structure irradiated with direct sunlight or the like, the temperature inside the cavity portion can be made to follow the room temperature, and deterioration of the top plate can be suppressed.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying out the Invention

[0019] Hereinafter, an embodiment of the desk according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an outline of the external configuration of a desk 100 according to an embodiment of the present invention as seen from an obliquely front direction. Further, FIG. 2 is a front view showing an outline of the external configuration of the desk 100 shown in FIG. 1. Further, FIG. 3 is a cross-sectional view of the desk 100 seen from the 3-3 line shown in FIG. 2. Note that each drawing referred to in this specification may be schematically represented, such as exaggerating some components for easy understanding of the present invention, so the dimensions and ratios between the components may be different. This desk 100 is a learning desk used by children and students together with chairs (not shown) in the classroom in educational facilities such as elementary schools and junior high schools.

[0020] (Configuration of the desk 100) The desk 100 mainly includes support legs 110 and a top plate 120. The support legs 110 are components for horizontally supporting the top plate 120 at a predetermined height position from the floor surface, and are made of steel plate materials. Specifically, the support legs 110 mainly include leg bodies 111 and a top plate support 112 respectively.

[0021] The pedestal 111 is a frame-shaped component that is placed on the floor surface where the desk 100 is installed and supports the top plate support 112, and is provided so as to be located at a position outside the width in the left-right direction of the user of the desk 100 (for example, shoulder width). More specifically, the pedestal 111 has frame bodies that extend vertically on both the left and right sides of the user and are connected to each other at the lower part, and the lower ends of the frame bodies that extend vertically are each formed to extend in the front-rear direction of the user. The top plate support 112 is attached to the upper ends of the frame bodies that extend vertically in the pedestal 111.

[0022] The top plate support 112 is a component for supporting the top plate 120 above the pedestal 111 and is composed of a steel plate material. More specifically, the top plate support 112 includes two side frames 113 that extend upward from the left and right upper ends of the pedestal 111 respectively, and a bottom plate 114 provided between these two side frames 113.

[0023] The side frame 113 is formed in a frame shape that extends upward from the left and right upper ends of the pedestal 111 respectively, and then slightly protrudes to the rear side of the desk 100 while largely protruding to the front side of the desk 100. A plurality of height adjustment holes 113a for freely changing the vertical mounting position with respect to the pedestal 111 are formed along the vertical direction in the side frame 113. In addition, the upper ends of the left and right side frames 113 are each bent outward in the left-right direction to form attachment portions 113b. The attachment portion 113b is a portion where the top plate 120 is applied and attached by a connecting tool 115 made of a screw, and is formed in a plate shape that extends in the front-rear direction of the desk 100.

[0024] As shown in FIG. 4, the bottom plate 114 is a component that constitutes the bottom and the back wall 114a of the storage portion 116, and is formed by bending a steel plate. Specifically, the bottom plate 114 is configured as a rectangular plate-like body disposed opposite to the lower surface of the top plate 120 with a predetermined interval therebetween, and a portion of the plate-like body at the rear side of the desk 100 is bent upward to form the back wall 114a. The back wall 114a is a wall body standing at the innermost part of the storage portion 116, and the upper end portion is bent outward to form a plate-like attachment portion 114b similar to the attachment portion 113b. On the left and right sides of the bottom plate 114, it is fixedly attached to the side frame 113.

[0025] The storage portion 116 is a space for the user of the desk 100 to store articles such as textbooks, notebooks, or stationery, and is formed in the space directly below the top plate 120. The storage portion 116 is partitioned by the top plate 120, the bottom plate 114, the back wall 114a, and the two side frames 113, and is formed to open toward the front side where the user sits on a chair (not shown).

[0026] The top plate 120 is a component that constitutes the mounting surface at the uppermost part of the desk 100, and is formed by laminating plate-like woods. More specifically, as shown in FIGS. 4 and 5 respectively, the top plate 120 mainly includes a middle layer structure body 121, an upper layer structure body 130, and a lower layer structure body 140. In FIG. 3, the illustrations of the middle layer structure body 121, the upper layer structure body 130, and the lower layer structure body 140 are omitted.

[0027] The middle layer structure body 121 is a component for forming a cavity portion 123 inside the top plate 120, and is formed in an annular shape that is rectangular in plan view. More specifically, the middle layer structure body 121 is configured by assembling two rectangular laminated plates 121a for long sides and two rectangular laminated plates 121b for short sides into a rectangular frame shape in plan view. In this case, the adjacent long-side laminated plate 121a and the short-side laminated plate 121b are connected to each other using a fastener 122 such as a tucker.

[0028] This middle-layer structure 121 is composed of wood and a thickness that can ensure the screwing of the connecting tool 115 for attaching the top plate 120 to the side frame 113 and the bottom plate 114 respectively, maintaining the connected state after screwing, and withstanding the rigidity required for use as the top plate 120. In this embodiment, the middle-layer structure 121 is formed by laminating and bonding a plurality of (for example, 5) plywood sheets of eucalyptus wood. Also, the middle-layer structure 121 is formed thicker (8.2 mm in this embodiment) than the thicknesses of the upper-layer structure and the lower-layer structure respectively.

[0029] Thereby, the middle-layer structure 121 is composed of a thickness and a high rigidity that are thicker than those of the upper-layer structure 130 and the lower-layer structure 140. Also, since the middle-layer structure 121 is composed of eucalyptus wood with high insect and corrosion resistance, it is configured to have higher insect and corrosion resistance than the upper-layer structure 130 and the lower-layer structure 140.

[0030] The outer peripheral part of this middle-layer structure 121 130 and the lower-layer structure 140 are formed in a rectangular shape of the same size, and the inner peripheral part is formed in a rectangular shape that is located inside the respective attachment parts 113b and 114b of the side frame 113 and the bottom plate 114. Thereby, a cavity part 123 composed of a rectangular through-hole in plan view is formed in the central part of the middle-layer structure 121.

[0031] The cavity part 123 is a three-dimensional region with nothing inside formed inside the top plate 120. This cavity part 123 is surrounded by the middle-layer structure 121 on all four sides (sides), and is partitioned by the upper-layer structure and the lower-layer structure above and below respectively, and is formed in a flat plate shape extending along the plate surface direction of the top plate 120 as a whole.

[0032] The upper structure 130 is provided above the middle structure 121 and constitutes the upper surface of the top plate 120, and is composed of a rectangular plate material. This upper structure 130 is mainly composed of three layers. Specifically, the upper structure 130 is composed of a base layer 131, an auxiliary layer 132, and a surface layer 133.

[0033] The base layer 131 is the part that forms the basis of the upper structure 130 and has a greater thickness than the auxiliary layer 132 and the surface layer 133. thick In this embodiment, the base layer 131 is formed into a plate shape with a thickness of 3.7 mm by laminating and bonding a plurality of (two) plywoods made of falcata wood.

[0034] The auxiliary layer 132 is a part for facilitating the formation of the surface layer 133 while reinforcing the upper structure 130. In this embodiment, the auxiliary layer 132 is formed into a plate shape with a thickness of 3.0 mm by laminating and bonding a plurality of (two) medium density fiberboard (MDF) plates. And this auxiliary layer 132 is joined to the entire surface of the base layer 131 with an adhesive. By using medium density fiberboard for this auxiliary layer 132, the base layer 131 made of falcata wood with low rigidity can be reinforced against the cavity 123, and the surface layer 133 made of a melamine resin sheet can be easily formed.

[0035] The surface layer 133 is a coating layer for improving the aesthetics while protecting the surface of the top plate 120. In this embodiment, the surface layer 133 is configured by arranging a melamine resin sheet with a thickness of 0.7 mm. In this case, the surface layer 133 is joined to the entire surface of the auxiliary layer 132 with an adhesive. Note that this surface layer 133 may be formed directly on the base layer 131 by omitting the auxiliary layer 132, or the surface layer 133 itself may be omitted. Also, in FIG. 5, the surface layer 133 is shown filled with dots.

[0036] On the upper layer structure 130, a base layer 131 is joined to the entire upper surface of the middle layer structure 121 by an adhesive. As a result, the cavity 123 is closed at the upper side by the base layer 131 in the upper layer structure 130.

[0037] The lower layer structure 140 is provided below the middle layer structure 121 and forms the lower surface of the top plate 120, and is composed of a rectangular plate material. This lower layer structure 140 is formed to have a thickness thinner than that of the upper layer structure 130. In the present embodiment, the lower layer structure 140 is formed into a plate shape with a thickness of 2.4 mm by laminating and bonding a plurality of (two) plywoods made of lauan wood. This lower layer structure 140 is joined to the entire lower surface of the middle layer structure 121 by an adhesive. As a result, the cavity 123 is closed at the lower side by the lower layer structure 140.

[0038] (Manufacture of the desk 100) Next, the manufacturing process of the desk 100 configured as described above will be described. An operator manufacturing the desk 100 first manufactures the top plate 120. Specifically, the operator prepares the middle layer structure 121, the upper layer structure 130, and the lower layer structure 140 respectively. These middle layer structure 121, upper layer structure 130, and lower layer structure 140 may be prepared in any order, but will be described starting from the middle layer structure 121.

[0039] The operator prepares a plurality of (five in the present embodiment) thin plate materials made of eucalyptus wood that constitute the middle layer structure 121. In this case, the operator prepares rectangular plate materials extending in a strip shape that are each a material for the two long-side laminated plate materials 121a and the two short-side laminated plate materials 121b that constitute the frame-shaped middle layer structure 121.

[0040] Next, the operator applies an adhesive to each plate surface of the plurality of plate materials that respectively constitute the two long sides of the middle layer structure 121, stacks them, and then presses them against each other using a press machine (not shown). As a result, two rectangular laminated plate materials 121a for the two long sides that respectively constitute the two long sides of the middle layer structure 121 are produced. Next, the operator applies an adhesive to each plate surface of the plurality of plate materials that respectively constitute the two short sides of the middle layer structure 121, stacks them, and then presses them against each other using a press machine (not shown). As a result, two rectangular laminated plate materials 121b for the two short sides that respectively constitute the two short sides of the middle layer structure 121 are produced.

[0041] Next, the operator assembles the two laminated plate materials 121a for the long sides and the two laminated plate materials 121b for the short sides into a rectangular frame shape to produce the middle layer structure 121. Specifically, the operator arranges the two laminated plate materials 121a for the long sides parallel to each other and arranges the two laminated plate materials 121b for the short sides between both ends of these two laminated plate materials 121a for the long sides. Then, the adjacent laminated plate materials are connected to each other using a fastening fitting 122 such as a tucker. As a result, a rectangular frame-shaped middle layer structure 121 is produced in plan view (bottom view).

[0042] Next, the operator prepares a plurality of thin plate materials (two sheets each in this embodiment) made of falcata materials and medium density fiberboard (MDF) materials that constitute the upper layer structure 130. In this case, the operator prepares rectangular plate materials in plan view as the plurality of thin plate materials made of falcata materials and medium density fiberboard that constitute the upper layer structure 130. Next, the operator applies an adhesive to each plate surface of each of the plurality of sheet materials made of these falcata materials and medium density fiberboard, stacks them, and then presses them against each other using a press machine (not shown). As a result, an upper layer structure 130 having a rectangular shape in plan view is produced.

[0043] Next, the operator prepares a plurality of (two in this embodiment) thin plates made of raw materials constituting the lower layer structure 140. In this case, the operator prepares rectangular plates in plan view as a plurality of thin plates made of raw materials constituting the lower layer structure 140. Next, the operator applies an adhesive to each plate surface of these plurality of plates made of raw materials, stacks them, and then presses them against each other using a press machine (not shown). Thereby, the lower layer structure 140 having a rectangular shape in plan view is manufactured.

[0044] Next, the operator joins the middle layer structure 121 and the lower layer structure 140. Specifically, the operator applies an adhesive to each joint surface of the middle layer structure 121 and the lower layer structure 140, stacks them, and then presses them against each other using a press machine (not shown). Next, the operator joins the middle layer structure 121 and the upper layer structure 130. Specifically, the operator applies an adhesive to each joint surface of the middle layer structure 121 and the upper layer structure 130, stacks them, and then presses them against each other using a press machine (not shown).

[0045] Next, the operator prepares a melamine resin sheet, applies an adhesive to the upper surface of the upper layer structure 130, and then adheres and fixes the melamine resin sheet to the upper surface of the upper layer structure 130 to form a surface protection layer 125 on the upper surface of the upper layer structure 130. Next, the operator processes the outer peripheral portion (so-called, the edge) of the top plate 120 composed of the lower layer structure 140, the middle layer structure 121, and the upper layer structure 130 joined to each other into an arc shape using a cutting machine such as a router. Next, the operator applies a clear urethane resin to the back surface of the top plate 120, that is, the lower surface of the lower layer structure 140. Thereby, the top plate 120 having a rectangular shape in plan view is manufactured.

[0046] Next, the operator prepares the support legs 110 and attaches the top plate 120 onto the support legs 110. Specifically, the operator places the lower structure 140 of the top plate 120 on the attachment parts 113b and 114b of the support legs 110, and then screws in the connectors 115 through these attachment parts 113b and 114b. In this case, since the lower structure 140 of the top plate 120 is made of a material with high rigidity such as raw wood, the top plate 120 can be stably fixed to the support legs 110. Thus, the desk 100 is completed.

[0047] (Operation of the desk 100) Next, the operation of the desk 100 configured as such will be described. The user of the desk 100 places the desk 100 at the location where it will be used. In this case, since the hollow part 123 is formed inside the top plate 120 and the desk 100 is formed in a hollow shape, the entire desk 100 is lightened and the center of gravity of the desk 100 is lowered, so the user can easily and stably carry it.

[0048] Next, the user places a chair (not shown) in front of the desk 100, sits down, and uses the desk 100. In this case, the user can store articles such as textbooks, notebooks, or stationery in the storage part 116.

[0049] As can be understood from the above operation description, according to the above embodiment, since the desk 100 has one hollow part 123 extending in a flat plate shape inside the top plate 120 and is formed in a hollow shape as a whole, the top plate 120 is lightened and can be easily carried.

[0050] Furthermore, in the implementation of the present invention, it is not limited to the above embodiment, and various modifications are possible without departing from the object of the present invention.

[0051] For example, in the above-described embodiment, the top plate 120 is composed of the middle-layer structure 121, the upper-layer structure 130, and the lower-layer structure 140. However, the top plate 120 may be configured to be divided into two or four or more parts in the thickness direction. Here, when the top plate 120 is configured to be divided into two parts in the thickness direction, the lower-layer structure 140 may be joined to the upper-middle-layer structure formed by integrally forming the middle-layer structure 121 and the upper-layer structure 130, or the upper-layer structure 130 may be joined to the middle-lower-layer structure formed by integrally forming the middle-layer structure 121 and the lower-layer structure 140, or the middle-lower-layer structure formed by integrally forming the other part of the middle-layer structure 121 and the lower-layer structure 140 may be joined to the upper-middle-layer structure formed by integrally forming a part of the middle-layer structure 121 and the upper-layer structure 130 to form the structure.

[0052] In addition, the top plate 120 may be configured to be divided into two or more parts in the long-side direction or the short-side direction of the top plate 120, which is a direction orthogonal to the thickness direction. Further, the top plate 120 may be made of a resin material instead of or in addition to being made of wood.

[0053] Also, in the above-described embodiment, the middle-layer structure 121 is formed to have the highest rigidity (at least one of bending strength, compressive strength, and shear strength) with respect to the upper-layer structure 130 and the lower-layer structure 140. As a result, the top plate 120 can stably maintain the shape of the cavity 123 and suppress the deformation of the entire top plate 120 over time. However, the middle-layer structure 121 may be formed to have the same rigidity or lower rigidity than the upper-layer structure 130 and the lower-layer structure 140 and It can also be formed.

[0054] Also, in the above-described embodiment, the middle-layer structure 121 is formed to be the thickest with respect to the upper-layer structure 130 and the lower-layer structure 140. As a result, the thickness of the cavity 123 becomes the smallest inside the top plate 120, and the top plate can be effectively lightened. However, the middle-layer structure 121 may be formed to have the same thickness or a thickness less than that of the upper-layer structure 130 and the lower-layer structure 140.

[0055] Further, in the above embodiment, the middle layer structure 121 is made of eucalyptus wood which has high insect-proof and anti-corrosion properties against the upper layer structure 130 and the lower layer structure 140. Thereby, the top plate 120 can effectively suppress the intrusion of pests from the periphery of the cavity portion 123 into the cavity portion 123 and the corrosion of the periphery thereof. However, it is natural that the middle layer structure 121 may be made of a material having inferior insect-proof and anti-corrosion properties against the upper layer structure 130 and the lower layer structure 140. That is, the middle layer structure 121, the upper layer structure 130, and the lower layer structure 140 constituting the top plate 120 can be made of arbitrary materials respectively.

[0056] Further, in the above embodiment, the lower layer structure 140 is formed to be thinner than the upper layer structure 130. Thereby, the top plate 120 can suppress the rapid temperature change in the cavity portion 123 through the upper layer structure 130 irradiated with direct sunlight or the like and make the temperature in the cavity portion 123 follow the room temperature, and can suppress the deterioration of the top plate. The lower layer structure 140 can also be formed to be thicker than the upper layer structure 130. That is, the middle layer structure 121, the upper layer structure 130, and the lower layer structure 140 constituting the top plate 120 can have arbitrary thickness configurations respectively.

[0057] Further, in the above embodiment, the cavity portion 123 is formed in a rectangular shape in plan view. However, the cavity portion 123 can also be formed in a polygonal shape such as a triangular shape or a hexagonal shape or a circular shape (including an oval shape) in addition to a rectangular shape or a square shape in plan view.

[0058] Further, in the above embodiment, the desk 100 is configured to include a storage portion 116 below the top plate 120. However, the desk 100 can also be configured by omitting the storage portion 116. That is, the desk 100 can be configured by omitting the bottom plate 114.

[0059] Also, in the above-described embodiment, the connector 115 is constituted by a screw. However, the connector 115 may be any component that can be inserted into the top plate 120 and connect the top plate 120 to the support legs 110, and may be other than a screw, for example, a nail or a rivet.

[0060] Also, in the above-described embodiment, the desk 100 is a study desk used in educational facilities such as elementary schools and junior high schools. However, it can also be implemented as a desk other than a study desk for educational facilities, for example, a home study desk, an office desk, or a dining table.

Explanation of Reference Numerals

[0061] 100... Desk, 110... Support leg, 111... Leg body, 112... Top plate support, 113... Side frame, 113a... Height adjustment hole, 113b... Mounting portion, 114... Bottom plate, 114a... Rear wall, 114b... Mounting portion, 115... Connector, 116... Storage portion, 120... Top plate, 121... Middle layer structure, 121a... Laminated plate material for long side, 121b... Laminated plate material for short side, 122... Fastener, 123... Hollow portion, 130... Upper layer structure, 131... Base layer, 132... Auxiliary layer, 133... Surface layer, 140... Lower layer structure.

Claims

1. Support legs that stand up from the floor surface, A top plate supported on the upper part of the support legs, A desk comprising a connector that is inserted into the top plate via the support legs to connect the support legs and the top plate to each other, The top plate, Has one hollow portion that extends in a flat plate shape along the plate surface direction of the top plate inside the top plate and is formed in a hollow shape as a whole, A middle layer structure formed in a flat plate ring shape surrounding the periphery of the hollow portion, An upper layer structure that covers one surface of the middle layer structure and constitutes the upper surface side of the top plate, And a lower layer structure that covers the other surface of the middle layer structure and constitutes the lower surface side of the top plate, The middle layer structure, Characterized in that it constitutes the outer peripheral portion of the top plate and the inner peripheral surface of the hollow portion, and is formed with the highest rigidity with respect to the upper layer structure and the lower layer structure.

2. Support legs that stand up from the floor surface, A top plate supported on the upper part of the support legs, A desk comprising a connector that is inserted into the top plate via the support legs to connect the support legs and the top plate to each other, The top plate, Has one hollow portion that extends in a flat plate shape along the plate surface direction of the top plate inside the top plate and is formed in a hollow shape as a whole, A middle layer structure formed in a flat plate ring shape surrounding the periphery of the hollow portion, An upper layer structure that covers one surface of the middle layer structure and constitutes the upper surface side of the top plate, And a lower layer structure that covers the other surface of the middle layer structure and constitutes the lower surface side of the top plate, The middle layer structure, Characterized in that it is composed of a laminated material in which a plurality of plates are laminated, and is formed with the highest rigidity with respect to the upper layer structure and the lower layer structure.

3. In the desk according to claim 2, The middle layer structure, Characterized in that it constitutes the outer peripheral portion of the top plate and the inner peripheral surface of the hollow portion.

4. In the desk according to claim 1 or claim 2, The middle layer structure, Characterized in that it is formed thickest with respect to the upper layer structure and the lower layer structure.

5. In the desk according to claim 1 or claim 2, The middle layer structure, Characterized in that it is composed of a material having at least one of high insect resistance and high corrosion resistance with respect to the upper layer structure and the lower layer structure.

6. In the desk according to claim 1 or claim 2, The lower layer structure, A machine characterized in that it is formed to be thinner in thickness than the upper-layer structure body.

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