Floorboard and floor unit

Abstract

To provide a floorboard which can easily achieve both appropriate shock absorption and appropriate resilience at the same time.SOLUTION: The floorboard includes a board, a support member 24 attached to the underside of the board to support the board, and a leg 40 attached to the support member 24 so as to form a gap between the support member 24 and the installation surface. The board includes a base layer formed from a wood-based material. The support member 24 is formed from a resin material. The leg 40 is formed from a material with a lower elastic modulus than the support member 24.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to floorboards and floor units. [Background technology]

[0002] Patent Document 1 describes a gymnasium floor structure in which joists are placed on support legs fixed at regular intervals on a concrete foundation, and vibration-damping curved steel plates with uneven cross-sections are placed on top of these as floor joists, with a surface panel placed on top of these. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-109735 Summary of the Invention [Problem to be solved by the invention]

[0004] The floor structures used in sports facilities such as gymnasiums are required to have shock absorption and resilience. In particular, standards regarding shock absorption and resilience are sometimes established for the floor structures of sports facilities where competitive sports are played. However, it is difficult to achieve both adequate shock absorption and adequate resilience at the same time. [Means for solving the problem]

[0005] A floorboard that solves the above problem is a floorboard that is laid on an installation surface and comprises a board material having an upper surface and a lower surface, a support member attached to the lower surface of the board material and supporting the board material, and legs attached to the support member so as to form a gap between the support member and the installation surface, wherein the board material has a base layer formed from a wood-based material, the support member is formed from a resin material, and the legs are formed from a material with a lower elastic modulus than the support member.

[0006] In one aspect of the above floorboard, the support member is composed of a combination of multiple unit blocks arranged in a planar direction, each unit block having a frame portion and multiple ribs formed within the frame portion, and the peripheral region of the unit block has a higher resin density than the central region of the unit block.

[0007] In one aspect of the floorboard, the support member includes an upper wall to which the plate material is attached and a support wall to which the legs are attached, and the support wall is located below the upper wall.

[0008] One aspect of the floorboard includes a cap attached to the tip of the leg and covering the tip surface of the leg. In one aspect of the floorboard, a gap is provided between the leg and the cap to allow deformation of the leg when a load is applied to the leg.

[0009] The floor unit that solves the above problem is a floor unit that is laid on an installation surface and comprises a board having an upper surface and a lower surface, a support member attached to the lower surface of the board and supporting the board, and legs attached to the support member so as to form a gap between the support member and the installation surface, wherein the board has a base layer formed from a wood-based material, the support member is formed from resin, and the legs are formed from a material with a smaller elastic modulus than the support member, and the support member is composed of a combination of multiple unit blocks arranged in a planar direction. [Effects of the Invention]

[0010] According to the present invention, it is easy to simultaneously achieve appropriate shock absorption and appropriate resilience. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is an exploded perspective view of a floor panel. [Figure 2] FIG. 2 is a bottom view of the support member. [Figure 3]FIG. 3 is a perspective view showing the upper surface side of a unit block that constitutes the support member. [Figure 4] FIG. 4 is a perspective view showing the lower surface side of a unit block that constitutes the support member. [Figure 5] FIG. 5 is a bottom view of a unit block that constitutes the support member. [Figure 6] FIG. 6 is an enlarged view of the range A1 in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. [Figure 8] FIG. 8 is an explanatory diagram of a connecting member and a connected member. [Figure 9] FIG. 9 is a top view of a floor structure made up of a plurality of floor plates. [Figure 10] FIG. 10 is a bottom view of the area A2 in FIG. [Figure 11] FIG. 11 is a bottom view of the area A3 in FIG. [Figure 12] FIG. 12 is a cross-sectional view showing a leg portion of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the floorboard of the present invention will be described below. As shown in Fig. 1, the floorboard 20 has a generally rectangular planar shape with a pair of long sides that are parallel to each other and a pair of short sides that are parallel to each other. As will be described in detail later, the floorboards 20 are configured to form a predetermined floor surface by arranging a plurality of floorboards 20 on an installation surface. Hereinafter, the direction in which the short sides of the floorboards 20 extend (the up-down direction in Fig. 2) may be referred to as the vertical direction, and the direction in which the long sides extend (the left-right direction in Fig. 2) may be referred to as the horizontal direction.

[0013] <Base material> As shown in FIG. 1, the floorboard 20 includes a board 21 having an upper surface 21a and a lower surface 21b. The board 21 includes a base material layer 22 formed from a wood-based material. The planar shape of the board 21 is the same as the planar shape of the floorboard 20. An example of the board 21 is a laminated material including the base material layer 22 and a surface material layer 23 laminated on the upper surface of the base material layer 22. The lower surface 21b of the board 21 is formed by the base material layer 22. The upper surface 21a of the board 21 is formed by the surface material layer 23.

[0014] The base material layer 22 is formed, for example, from a single board made of a wood-based material. The surface material layer 23 may be formed from a wood-based material or a material other than a wood-based material. One example of the surface material layer 23 is formed by arranging multiple long pieces of wood-based material, each having a predetermined surface treatment, in parallel and fixing them to the upper surface of the base material layer 22. Examples of the wood-based material include wood fiberboards such as medium-density fiberboards (MDF) and solid wood materials. Examples of materials other than the wood-based material include resin materials, rubber materials, and elastomers. The material other than the wood-based material may be a combination of two or more materials selected from resin materials, rubber materials, and elastomers. Examples of resin materials include plastic materials such as polyvinyl chloride, polypropylene, polyethylene, polyethylene terephthalate, fiber-blended resins, and engineering plastics. Examples of fiber-blended resins include glass fiber-blended resins and carbon fiber-blended resins. Examples of engineering plastics include polyacetal, polyamide, polycarbonate, modified polyphenylene ether, and polybutylene terephthalate.

[0015] The plate material 21 is not limited to the above-mentioned laminated material, and may be a laminated material of three or more layers, or may be a single-layer plate material, for example, a plate material 21 consisting of only the base material layer 22. The plate material 21 may also have layers other than the base material layer 22 and the surface material layer 23. For example, the plate material 21 may have a configuration including a cushion layer located between the base material layer 22 and the surface material layer 23. Examples of materials that form the cushion layer include rubber materials and elastomers.

[0016] <Supporting member> The floorboard 20 is attached to the lower surface 21b of the board 21 and includes a support member 24 that supports the board 21. The support member 24 is made of a resin material. Examples of the resin material that makes up the support member 24 include plastic materials such as polypropylene, polyethylene, polyethylene terephthalate, fiber-blended resin, and engineering plastic. Examples of fiber-blended resin include glass fiber-blended resin and carbon fiber-blended resin. Examples of engineering plastic include polyacetal, polyamide, polycarbonate, modified polyphenylene ether, and polybutylene terephthalate.

[0017] As shown in Fig. 2, the support member 24 is composed of a combination of a plurality of unit blocks 30 arranged in a planar direction. In this embodiment, the support member 24 is composed of a total of eight unit blocks 30a to 30h, arranged in two vertical rows and four horizontal rows, or 2 vertical and 4 horizontal rows. The unit blocks 30a to 30h have the same shape. Below, the unit block 30a will be described, and descriptions of the other unit blocks will be omitted.

[0018] As shown in FIGS. 4 and 5, the unit block 30a includes a frame portion 31, a plurality of leg attachment portions 32 arranged in the frame portion 31, and a plurality of ribs formed in the frame portion 31. The frame 31 is an annular wall portion having a rectangular shape in a plan view. In the following, as an example, a case where the frame 31 has a square shape in a plan view will be described.

[0019] The frame portion 31 has a pair of outer surfaces 31a and 31c extending in the vertical direction, and a pair of outer surfaces 31b and 31d extending in the horizontal direction. Each of the outer surfaces 31a to 31d is formed with an outwardly protruding engagement protrusion 33a and an inwardly recessed engagement recess 33b. The engagement protrusion 33a and the engagement recess 33b are shaped so that they can engage with each other due to their concave-convex relationship.

[0020] The engaging protrusion 33a has an open upper surface and a bottom wall 33a1 formed on its lower surface. The engaging recess 33b has an open upper surface and a bottom wall 33b1 formed on its lower surface. The bottom wall 33b1 is formed in a position close to or in contact with the bottom wall 33a1 of the engaging protrusion 33a when the engaging protrusion 33a and the engaging recess 33b are engaged with each other. Therefore, in the engaged state, the engaging protrusion 33a is accommodated in the engaging recess 33b in a manner that it is sandwiched in the vertical direction between the plate material 21 arranged on the support member 24 and the bottom wall 33b1. This makes it possible to suppress rattling of the engaging protrusion 33a in the vertical direction within the engaging recess 33b.

[0021] A thin linear rib, a so-called thread rib, may be provided on either or both of the lower surface of the bottom wall 33a1 of the engaging protrusion 33a and the upper surface of the lower wall 33b1 of the engaging recess 33b, which improves the effect of suppressing vertical rattle of the engaging protrusion 33a within the engaging recess 33b in the engaged state.

[0022] A pair of engaging protrusions 33a and engaging recesses 33b is formed on each of the outer surfaces 31a to 31d. In the vertical direction (the up-and-down direction in FIG. 5), the engaging protrusions 33a on the outer surface 31a and the engaging recesses 33b on the outer surface 31c are formed at the same position, and the engaging recesses 33b on the outer surface 31a and the engaging protrusions 33a on the outer surface 31c are formed at the same position. In the horizontal direction (the left-right direction in FIG. 5), the engaging protrusions 33a on the outer surface 31b and the engaging recesses 33b on the outer surface 31d are formed at the same position, and the engaging recesses 33b on the outer surface 31b and the engaging protrusions 33a on the outer surface 31d are formed at the same position.

[0023] A recess 34 is formed in the center of each of the outer surfaces 31a to 31d. By providing the recess 34 in the outer surfaces 31a to 31d, the worker can position his / her fingers within the recess 34 when placing the floorboard 20 on the installation surface. This prevents the worker's fingers from getting caught between the installation surface and the floorboard 20.

[0024] First mounting recesses 35a are formed in one of two diagonally opposite corners of the frame 31, and second mounting recesses 35b are formed in the other of the two diagonally opposite corners. The first mounting recesses 35a and second mounting recesses 35b are recesses for mounting a connecting member 60. Details of the first mounting recesses 35a, second mounting recesses 35b, and connecting member 60 will be described later.

[0025] Nine leg attachment parts 32 are arranged inside the frame part 31. The nine leg attachment parts 32 are arranged at equal intervals in groups of three in the vertical and horizontal directions. The number and arrangement of the leg attachment parts 32 inside the frame part 31 are not particularly limited.

[0026] The leg mounting parts 32 are preferably arranged at equal intervals. In this case, the load applied from above to the floorboard 20 can be evenly distributed to the legs 40 attached to each leg mounting part 32. Details of the legs 40 will be described later.

[0027] The distance between adjacent leg mounting portions 32 in the vertical direction is distance L1, and the distance between adjacent leg mounting portions 32 in the horizontal direction is distance L2. The distance between the frame portion 31 and the leg mounting portion 32 arranged closer to the frame portion 31 in the vertical direction is distance L3, and the distance between the frame portion 31 and the leg mounting portion 32 arranged closer to the frame portion 31 in the horizontal direction is distance L4. The distance between adjacent leg mounting portions 32 in the diagonal direction is distance L5.

[0028] The distance L1 and the distance L2 preferably satisfy the relationship of 0.9L1 ≤ L2 ≤ 1.1L1, and more preferably satisfy the relationship of L1 = L2. The distance L3 and the distance L4 preferably satisfy the relationship of 0.9L4 ≤ L3 ≤ 1.1L4, and more preferably satisfy the relationship of L3 = L4. The distance L3 is preferably less than the distance L1, and more preferably is 1 / 2 of the distance L1. The distance L4 is preferably less than the distance L2, and more preferably is 1 / 2 of the distance L2. The distance L5 is preferably longer than the distance L1. The distance L5 is preferably longer than the distance L2. An example of the preferable arrangement of the leg attachment portion 32 is an arrangement that satisfies the relationships of L1 = L2 < L5, L3 = 1 / 2L1, and L4 = 1 / 2L2.

[0029] As shown in FIGS. 6 and 7, the leg attachment portion 32 has an annular wall 32a that is annular in plan view. In the present embodiment, the height of the annular wall 32a (the length in the thickness direction of the support member 24) is higher than that of the frame portion 31. Note that the height of the annular wall 32a may be the same as that of the frame portion 31, or may be lower than that of the frame portion 31.

[0030] As shown in FIG. 7, on the inner peripheral surface of the annular wall 32a, a support wall 32b is formed at an intermediate position in the thickness direction of the annular wall 32a and divides the inside of the annular wall 32a vertically. The support wall 32b is provided below the upper wall 36 described later. As shown in FIGS. 3 and 7, on the upper surface side of the support wall 32b, a reinforcing rib 32c is formed that is connected to the upper surface of the support wall 32b and connects between the inner peripheral surfaces of the annular wall 32a. In the present embodiment, two reinforcing ribs 32c that intersect at the center of the annular wall 32a in plan view are formed. A leg portion 40 is attached to the lower surface side of the support wall 32b of the leg attachment portion 32. Details of the leg portion 40 will be described later.

[0031] As shown in FIGS. 4 and 5, a plurality of ribs are formed inside the frame portion 31. The plurality of ribs includes a first rib R1, a second rib R2, a third rib R3, and a fourth rib R4. The first rib R1 connects the frame portion 31 and the annular wall 32a of the leg mounting portion 32, which is arranged closer to the frame portion 31. The first rib R1 is a single rib that extends linearly in a plan view. The end of the first rib R1 on the frame portion 31 side is at the same height as the frame portion 31, and the end on the annular wall 32a side is at the same height as the annular wall 32a. A step or sloped portion whose height changes is formed at the midpoint in the length direction of the first rib R1.

[0032] The second rib R2 connects the annular walls 32a of the leg attachment portions 32 that are adjacent in the vertical or horizontal direction. The second rib R2 is a single rib that extends linearly in a plan view. The second rib R2 has the same height as the annular walls 32a.

[0033] The third rib R3 connects the frame portion 31 and the second rib R2. The third rib R3 is a single rib that extends linearly in a plan view. The end of the third rib R3 on the frame portion 31 side is at the same height as the frame portion 31, and the end of the third rib R3 on the second rib R2 side is at the same height as the second rib R2. A step with a varying height is formed at the midpoint in the length direction of the third rib R3.

[0034] The fourth rib R4 connects the annular walls 32a of the leg mounting portions 32 adjacent in the diagonal direction. The fourth rib R4 is a plurality of ribs that extend linearly in a plan view and are arranged parallel to each other. In this embodiment, the fourth rib R4 is two ribs that are arranged parallel to each other. Both ends of the fourth rib R4 are the same height as the annular walls 32a. A low-back portion R4a that is partially lower in height is formed at the middle position in the length direction of the fourth rib R4. The height of the low-back portion R4a is, for example, lower than that of the frame portion 31.

[0035] As shown in FIG. 3, the unit block 30a has an upper wall 36 with which the plate material 21 comes into contact. The upper wall 36 is connected to the upper end of the wall-like portion that forms the frame portion 31, each rib, and the annular wall 32a of the leg mounting portion 32, and is formed so as to protrude in the width direction of the wall-like portion. It can also be said that each rib and the upper wall 36 connected to the end of the rib form a T-shaped rib. The upper wall 36 is formed so as to cover the upper surface side of the recess 34. A mounting hole 36a is formed in the upper wall 36 in a portion that straddles two fourth ribs R4 extending in an oblique direction, for fixing the unit block 30a to the plate material 21 by screwing or the like.

[0036] 5, the unit block 30a has an outer peripheral region located on the outer periphery side and a central region located on the central side in a plan view. The outer peripheral region is a region closer to the frame portion 31 (outside) than an annular imaginary line connecting the leg attachment portions 32 located on the outermost periphery. In other words, the outer peripheral region is a region closer to the frame portion 31 than the second ribs R2, including the second ribs R2 connecting the leg attachment portions 32 located on the outermost periphery. The central region is a region closer to the center (inside) than the imaginary line.

[0037] In the unit block 30a, the resin density is higher in the outer peripheral region than in the central region. The resin densities in the outer peripheral region and the central region can be adjusted by changing the number of ribs arranged in each region, the thickness of each rib, and the height of each rib. As an example, in this embodiment, more ribs are formed in the outer peripheral region than in the central region, and a low-back portion R4a is provided in the fourth rib R4 located in the central region. This adjusts the resin density in the outer peripheral region to be higher than in the central region. Note that the unit block 30a may be configured such that the resin densities in the outer peripheral region and the central region are the same, or may be configured such that the resin density in the central region is higher than that in the outer peripheral region.

[0038] <Legs> As shown in FIG. 7, legs 40 are attached to the lower surface of the support wall 32b of each leg attachment portion 32 of the unit block 30a. The legs 40 are formed of a material having a lower elastic modulus than the unit block 30a (support member 24). Examples of materials for forming the legs 40 include rubber materials and elastomers. The elastic modulus of the legs 40 is, for example, 1 MPa or more and 25 MPa or less, and preferably 2 MPa or more and 5 MPa or less. The ratio of the elastic modulus of the legs 40 to the elastic modulus of the support member 24 (= "elastic modulus of support member" ÷ "elastic modulus of the legs") is, for example, 120 or more and 3000 or less.

[0039] The leg 40 has a base end surface 40a and a tip end surface 40b formed parallel to each other. The base end surface 40a is a surface that contacts the support wall 32b of the leg mounting part 32, and the tip end surface 40b is a surface that faces the opposite side to the base end surface 40a. The tip end surface 40b of the leg 40 protrudes downward from the unit block 30a (support member 24). More specifically, the tip end surface 40b of the leg 40 is located below the lower end of the annular wall 32a of the leg mounting part 32, which is the lowest part of the unit block 30a. By positioning the tip end surface 40b of the leg 40 as described above, a gap can be formed between the support member 24 and the installation surface.

[0040] The leg portion 40 is formed in a truncated cone shape with a cross-sectional area that gradually decreases from the base end surface 40a toward the tip end surface 40b. Here, as shown in Fig. 6, the outer dimension D1 (diameter) of the base end surface 40a of the leg portion 40 is longer than the width H1 of the portion of the upper wall 36 that is connected to the first rib R1 and the second rib R2. In addition, the outer dimension D1 of the tip end surface 40b of the leg portion 40 is longer than the width H2 of the portion of the upper wall 36 that is connected to the fourth rib R4.

[0041] 7, a cap mounting hole 41 is formed in the tip surface 40b of the leg portion 40. The cap mounting hole 41 is a recess having a circular bottom surface and an inner peripheral surface with a circular cross section. A through hole 42 is formed in the bottom surface of the cap mounting hole 41, penetrating all the way to the tip surface 40b.

[0042] A cap 50 for protecting the tip surface 40b is attached to the tip surface 40b of the leg portion 40. The cap 50 suppresses wear of the tip surface 40b of the leg portion 40 due to friction between the tip surface 40b of the leg portion 40 and the installation surface, etc.

[0043] The cap 50 includes a disk-shaped bottom wall 51 disposed on the tip surface 40b, and an annular peripheral wall 52 extending upward from the periphery of the bottom wall 51. The outer shape of the bottom wall 51 is larger than the outer shape of the tip surface 40b of the leg 40. Therefore, a gap S1 is formed between the inner peripheral surface of the peripheral wall 52 and the outer peripheral surface of the leg 40. The outer shape of the bottom wall 51 is also smaller than the inner peripheral shape of the annular wall 32a of the leg mounting portion 32.

[0044] A mounting protrusion 53 is formed in the center of the upper surface of the bottom wall 51 to be inserted into the cap mounting hole 41 of the leg 40. The mounting protrusion 53 includes a circular upper mounting wall 53a facing the bottom surface of the cap mounting hole 41, and a peripheral mounting wall 53b connecting the upper mounting wall 53a and the bottom wall 51.

[0045] The protruding height of the mounting protrusion 53, i.e., the length from the upper surface of the bottom wall 51 to the upper surface of the upper mounting wall 53a, is shorter than the depth of the cap mounting hole 41 of the leg 40. Therefore, a gap S2 is formed between the bottom surface of the cap mounting hole 41 of the leg 40 and the upper mounting wall 53a of the mounting protrusion 53 of the cap 50.

[0046] Here, the vertical distance from the lower surface of the support wall 32b to the upper end of the peripheral wall 52 of the cap 50 is defined as distance L6. The vertical length of the gap S2, i.e., the distance from the bottom surface of the cap mounting hole 41 to the upper surface of the upper mounting wall 53a of the cap 50, is defined as distance L7. It is preferable that distance L6 is longer than distance L7 (L6>L7). In this case, it is possible to prevent the upper end of the peripheral wall 52 from contacting the lower surface of the support wall 32b when the leg 40 is deformed.

[0047] Also, let the distance from the lower end of the support member 24 to the installation surface be the distance L8. It is preferable that the distance L8 is shorter than the thickness T of the support member 24 (L8 < T). In this case, by forming the support member 24 thick, it is easy to ensure the strength of the support member 24. Note that the lower end of the support member 24 serving as the reference for the distance L8 is, for example, the lower end of the annular wall 32a. The thickness T of the support member 24 is, for example, the thickness of the support member 24 in the portion where the annular wall 32a is formed. Also, the thickness T of the support member 24 may be the average thickness of the support member 24.

[0048] A through hole 53a1 is formed in the central portion of the mounting upper wall 53a. A fastener 54 is inserted through the through hole 53a1. The fastener 54 is, for example, a tapping screw. The fastener 54 inserted through the through hole 53a1 is screwed to the support wall 32b of the unit block 30a through the through hole 53a1 of the cap 50. Thereby, the leg portion 40 and the cap 50 are fixed to the support wall 32b of the leg mounting portion 32 of the unit block 30a.

[0049] <Configuration regarding the arrangement of unit blocks and the connection between floorboards> As shown in FIG. 2, the eight unit blocks 30a to 30h are arranged in a plane in two rows in the vertical direction and four columns in the horizontal direction (vertical 2 × horizontal 4). The eight unit blocks 30a to 30h are fixed to the lower surface of the plate material 21 in the arranged manner as described above. The unit blocks 30a to 30h are fixed to the plate material 21, for example, by screwing through the mounting holes 36a (see FIG. 3) formed in the upper wall 36.

[0050] Among the unit blocks 30a to 30h arranged in the plane direction, two adjacent unit blocks are engaged with each other due to the concave-convex relationship of the engaging protrusions 33a and the engaging recesses 33b. Of the two adjacent unit blocks 30, the engaging protrusion 33a formed on the outer surface of one unit block 30 is housed in the engaging recess 33b formed on the outer surface of the other unit block 30. Similarly, the engaging protrusion 33a formed on the outer surface of the other unit block 30 is housed in the engaging recess 33b formed on the outer surface of one unit block. By engaging the engaging protrusions 33a and the engaging recesses 33b, it is possible to prevent the unit blocks 30 from shifting in position when the unit blocks 30 are fixed to the plate material 21.

[0051] Here, each unit block 30 has an orientation based on the formation positions of the first mounting recess 35a and the second mounting recess 35b. For example, in FIG. 2, the unit block 30a arranged in the upper left corner is arranged in an orientation in which the second mounting recess 35b is located at the upper left and the first mounting recess 35a is located at the upper right (hereinafter referred to as the first orientation). On the other hand, the unit block 30b arranged immediately to the right of the unit block 30a is arranged in an orientation in which the first mounting recess 35a is located at the upper left and the second mounting recess 35b is located at the upper right (hereinafter referred to as the second orientation). In this embodiment, two unit blocks 30, namely, the unit blocks 30b and 30h, are arranged in the second orientation, and the other six unit blocks 30 are arranged in the first orientation.

[0052] 2, a connecting member 60 is attached to the first mounting recess 35a of the unit block 30d located at the upper right corner and the first mounting recess 35a of the unit block 30h located at the lower right corner. Also, in FIG. 2, a connected member 61 is attached to the second mounting recess 35b of the unit block 30a located at the upper left corner and the second mounting recess 35b of the unit block 30b located at the center on the upper side.

[0053] 8, the connecting member 60 includes a base 60a fixed to the outer surface of the unit block 30 in a manner to be accommodated in the first mounting recess 35a of the unit block 30, and a locking portion 60b attached so as to be displaceable relative to the base 60a. The locking portion 60b is configured to be displaceable between a storage position where it is accommodated in the first mounting recess 35a and a locking position where it protrudes from the first mounting recess 35a. The connecting member 60 is, for example, a snap lock. The connected member 61 is a receiving portion that can lock the locking portion 60b of the connecting member 60.

[0054] By configuring the orientation of the unit block 30 and the mounting positions of the connecting member 60 and the connected member 61 as described above, when multiple floorboards 20 are arranged side by side, adjacent floorboards 20 can be connected to each other in both the vertical and horizontal directions.

[0055] Figure 9 shows a floor structure composed of multiple floorboards 20. Here, the multiple floorboards 20 are arranged in a so-called "horse joint" configuration, that is, the floorboards 20 are arranged with half of each other offset in the longitudinal direction. Also, in Figure 9, the positions of unit blocks 30b and 30h arranged in the second orientation are indicated by diagonal hatching.

[0056] 10, in a range A2 indicating a connection portion between floor panels 20 adjacent in the longitudinal direction of the floor panels 20, the first mounting recess 35a of the unit block 30d in the left floor panel 20 faces the second mounting recess 35b of the unit block 30a in the right floor panel 20. The locking portion 60b of the connecting member 60 attached to the first mounting recess 35a of the unit block 30d is locked to the connected member 61 attached to the second mounting recess 35b of the unit block 30a. This restricts the floor panels 20 adjacent in the longitudinal direction of the floor panels 20 from shifting apart from each other (the longitudinal positional shift of the floor panels 20).

[0057] 11, in a range A3 indicating a connection portion between floorboards 20 adjacent to each other in the short-side direction of the floorboards 20, the first mounting recess 35a of the unit block 30h in the upper floorboard 20 faces the unit block 30b and the second mounting recess 35b in the lower floorboard 20. The locking portion 60b of the connecting member 60 attached to the first mounting recess 35a of the unit block 30h is locked to the connected member 61 attached to the second mounting recess 35b of the unit block 30b. This restricts the floorboards 20 adjacent to each other in the short-side direction of the floorboards 20 from shifting apart from each other (the positional shift in the short-side direction of the floorboards 20).

[0058] <effect> Next, the operation of this embodiment will be described. The floorboard 20 has support members 24 made of a resin material attached to the underside 21b of a board 21 made of a wood-based material, which support the board 21. By providing the support members 24, the base layer 22, which is the portion of the board 21 made of a wood-based material, can be made thin while maintaining strength. In addition, the legs 40 are attached to the support members 24 so as to form a gap between the support members 24 and the installation surface, allowing the board 21 and the support members 24 to flex. The legs 40 are made of a material with a lower elasticity than the support members 24. This allows the legs 40 to absorb the impact transmitted from the floorboard 20 to the installation surface through the legs 40, as well as the reaction force transmitted from the installation surface to the board 21. As a result, the impact absorption of the floorboard 20 can be improved.

[0059] In addition, the portions of the boards 21 made of wood-based materials are thin, and the gaps are formed between the support members 24 and the installation surface, so that the boards 21 can bend significantly when a load is applied from above to the floorboards 20. These points also contribute to improving the resilience of the floorboards 20.

[0060] <Effects> Next, the effects of this embodiment will be described. (1) The floorboard 20 comprises a board 21 having an upper surface 21a and a lower surface 21b, a support member 24 attached to the lower surface 21b of the board 21 to support the board 21, and legs 40 attached to the support member 24 so as to form a gap between the support member 24 and the installation surface. The board 21 comprises a base layer 22 formed from a wood-based material. The support member 24 is formed from a resin material. The legs 40 are formed from a material having a lower elastic modulus than the support member 24.

[0061] According to the above-described configuration, when a load is applied from above to the floorboard 20, the shock absorption and resilience of the legs 40 can be improved. Therefore, it is easy to simultaneously achieve appropriate shock absorption and appropriate resilience. In addition, it is easy to reduce the weight of the board 21 by making the portion made of wood-based material thin.

[0062] (2) The support member 24 is formed by combining a plurality of unit blocks 30 arranged in the planar direction. Each unit block 30 includes a frame portion 31 and a plurality of ribs R1 to R4 formed within the frame portion 31. The peripheral region of each unit block 30 has a higher resin density than the central region of the unit block 30.

[0063] By using a support member 24 made up of a plurality of unit blocks 30, it is possible to reduce the size of each unit during resin molding, thereby preventing the molding device from becoming larger. In addition, by increasing the resin density in the outer peripheral region of the unit blocks 30, it is possible to ensure the strength of the periphery of the portion where adjacent unit blocks 30 contact each other in the support member 24 made up of a plurality of unit blocks 30.

[0064] (3) The support member 24 includes an upper wall 36 to which the plate material 21 is attached, and a support wall 32b to which the leg portion 40 is attached. The support wall 32b is provided below the upper wall 36. In this case, when a load is applied to the floorboard 20 from above, the path along which the impact travels from the plate material 21 to the leg portion 40 in the floorboard 20 can be lengthened.

[0065] 7, the support wall 32b is formed at a position lower than the upper wall 36, which makes it easy to ensure a space S3 above the support wall 32b in the support member 24 for forming a receiving portion for fixing the fastener 54. In the above embodiment, the reinforcing rib 32c corresponds to the receiving portion.

[0066] (4) The cap 50 is attached to the tip of the leg 40 and covers the tip surface 40b of the leg 40. By providing the cap 50, wear on the tip surface 40b of the leg 40 can be suppressed.

[0067] (5) Gaps S1 and S2 are provided between the leg portions 40 and the cap 50 to allow deformation of the leg portions 40 when a load is applied to the leg portions 40. In this case, the leg portions 40 can deform so as to bulge toward the gaps S1 and S2 when a load is applied. The greater deformation of the leg portions 40 improves the shock absorption ability of the leg portions 40.

[0068] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The planar shape of the floorboard 20 is not limited to a rectangular shape, but may be another shape, for example, a polygonal shape.

[0069] The number, orientation, and arrangement of the unit blocks 30 are not limited to the configurations of the above-described embodiment. As an example, as shown in Fig. 2, the support member 24 has a rectangular shape in plan view formed by arranging n (four in Fig. 2) unit blocks 30, each rectangular in plan view, in a row in the horizontal direction, and m (two in Fig. 2) rows in the vertical direction. m and n may be the same or different. When arranging floorboards 20 having support members 24 of the above configuration with a horse joint, it is preferable to arrange them so as to satisfy the following three conditions.

[0070] Condition 1: The first unit block 30a, which is a unit block 30 arranged at one corner of the first row, and the second unit block 30d, which is a unit block 30 arranged at the other corner of the first row, have the same orientation as determined by the first mounting recess 35a and the second mounting recess 35b.

[0071] Condition 2: The third unit block 30h, which is the unit block 30 arranged at the other corner of the nth column (second column), and the fourth unit block (unit block 30b in Figure 2), which is at least one of the unit blocks 30 (30b, 30c) arranged in the center of the first column, have the same orientation.

[0072] Condition 3: The third unit block 30h and the fourth unit block are oriented in a different direction from the first unit block 30a and the second unit block 30d. In this case, a connecting member 60 and a connected member 61 are attached to the first mounting recess 35a of the second unit block 30d and the second mounting recess 35b of the first unit block 30a, respectively. Also, a connecting member 60 and a connected member 61 are attached to the first mounting recess 35a of the third unit block 30h and the second mounting recess 35b of the fourth unit block, respectively. As a result, when the floorboards 20 are arranged with a horse joint, as shown in FIG. 10, horizontally adjacent floorboards 20 can be connected between the first unit block 30a and the second unit block 30d via the connecting member 60 and the connected member 61. Similarly, as shown in FIG. 11, vertically adjacent floorboards 20 can be connected between the third unit block 30h and the fourth unit block via the connecting member 60 and the connected member 61.

[0073] The planar shape of the unit block 30 is not limited to a square, but may be other shapes, such as a rectangle or a polygon. The floorboards 20 of the example are formed so that, when a plurality of floorboards 20 are arranged side by side with the plate materials 21 abutting against each other, the opposing side surfaces of the support members 24 of adjacent floorboards 20 are spaced apart. For example, as shown in FIGS. 10 and 11 , the outer shape of the support members 24 is slightly smaller than the outer shape of the plate materials 21. As a result, when the plate materials 21 of adjacent floorboards 20 are abutting against each other, a gap S4 is formed between the opposing side surfaces of the support members 24 of adjacent floorboards 20. Similarly, the floorboards 20 of the example are formed so that, when a plurality of floorboards 20 are arranged side by side with the plate materials 21 abutting against each other, the tip surfaces of the engaging protrusions 33a and the bottom surfaces of the engaging recesses 33b of the support members 24 of adjacent floorboards 20 are spaced apart.

[0074] Furthermore, the floorboards 20 may be formed so that when a plurality of floorboards 20 are arranged side by side with the plate materials 21 abutting against each other, the side surfaces of the support members 24 of adjacent floorboards 20 come into contact with each other. Similarly, when a plurality of floorboards 20 are arranged side by side with the plate materials 21 abutting against each other, the floorboards 20 may be formed so that the tip surfaces of the engaging protrusions 33a of the support members 24 of adjacent floorboards 20 come into contact with the bottom surfaces of the engaging recesses 33b.

[0075] The support member 24 may be made of a single member. In other words, the support member 24 may be a one-piece molded product. In this specification, a floor panel 20 in which the support member 24 is made of a single member is defined as a floor panel, and a floor unit 20 in which the support member 24 is made up of a plurality of unit blocks 30 is defined as a floor unit.

[0076] The gaps S1 and S2 between the leg portion 40 and the cap 50 may be changed. For example, the gap S2 may be omitted as shown in Fig. 12. Alternatively, as shown in Fig. 12, a recess 43 may be formed in the outer peripheral surface of the leg portion 40 to increase the gap S1 between the outer peripheral surface of the leg portion 40 and the peripheral wall 52 of the cap 50. Alternatively, the gaps S1 and S2 may not be formed.

[0077] A first elastic member may be interposed between the base end surface 40a of the leg 40 and the support wall 32b of the leg attachment portion 32. The first elastic member is made of a material different from the leg 40 and having a lower elastic modulus than the support member 24. In one example, the elastic modulus of the first elastic member is higher than that of the leg 40. In another example, the elastic modulus of the first elastic member is lower than that of the leg 40.

[0078] A second elastic member made of a material different from that of the leg 40 and having a lower elastic modulus than the support member 24 may be interposed on the tip surface 40b of the leg 40. In one example, the elastic modulus of the second elastic member is higher than that of the leg 40. In another example, the elastic modulus of the second elastic member is lower than that of the leg 40.

[0079] The cap 50 is not limited to the configuration of the above embodiment as long as it can protect the tip surface 40b of the leg portion 40. The cap 50 may also be omitted. The arrangement of the floorboards 20 when forming the floor structure is not limited to the horse joint arrangement. For example, the floorboards 20 may be arranged in a "horse joint arrangement," that is, so that the vertical and horizontal joints are both in a straight line.

[0080] Next, the technical ideas that can be understood from the above-described embodiment and modified examples will be described below. (A) the support member is configured by a combination of a plurality of unit blocks that are rectangular in plan view and arranged in a surface direction, a first mounting recess is formed in one of two pairs of diagonally positioned corner portions of the unit block, and a second mounting recess having a shape different from that of the first mounting recess is formed in the other pair; The support member is formed in a rectangular shape in a plan view by arranging m columns of n unit blocks in the horizontal direction (however, m and n may be the same or different from each other), a first unit block that is the unit block arranged at one corner of a first row, and a second unit block that is the unit block arranged at the other corner of the first row, are oriented in the same direction as each other, as determined by the first mounting recess and the second mounting recess; a third unit block which is the unit block arranged at the other corner of the n-th column and a fourth unit block which is at least one of the unit blocks arranged at the center of the first column have the same orientation, The third unit block and the fourth unit block are floor boards whose orientations are different from those of the first unit block and the second unit block. [Explanation of symbols]

[0081] R1...First rib R2: Second rib R3…Third rib R4…Fourth rib S1, S2...Gap 20...Floorboard 21...Plate material 21a…Top surface 21b…Bottom surface 22...Base material layer 23…Surface layer 24...Support member 30, 30a~30h...Unit block 31...Frame 40…legs 50...Cap

Claims

1. A floor board that is laid on the installation surface, a plate having an upper surface and a lower surface; a support member attached to the lower surface of the plate member and supporting the plate member; a leg portion attached to the support member so as to form a gap between the support member and the installation surface; The board has a base layer formed of a wood-based material, the support member is formed of a resin material, A floorboard characterized in that the legs are formed from a material with a lower elastic modulus than the support members.

2. the support member is configured by a combination of a plurality of unit blocks arranged in a planar direction, The unit block includes a frame portion and a plurality of ribs formed within the frame portion, The floorboard according to claim 1 , wherein the resin density of the peripheral region of the unit block is higher than that of the central region of the unit block.

3. the support member includes an upper wall to which the plate member is attached and a support wall to which the leg portion is attached, The floor panel according to claim 1 , wherein the support wall is provided below the upper wall.

4. The floorboard according to claim 1 , further comprising a cap attached to the tip of the leg and covering the tip surface of the leg.

5. 5. The floor panel according to claim 4, wherein a gap is provided between the leg and the cap to allow deformation of the leg when a load is applied to the leg.

6. A floor unit that is laid on an installation surface and used, a plate having an upper surface and a lower surface; a support member attached to the lower surface of the plate member and supporting the plate member; a leg portion attached to the support member so as to form a gap between the support member and the installation surface; The board has a base layer formed of a wood-based material, the support member is formed of resin, the leg portion is formed of a material having a lower elastic modulus than the support member, A floor unit characterized in that the support member is composed of a combination of multiple unit blocks arranged in a planar direction.

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