Double Floor System

Abstract

To provide a double floor system making remained marks on finish material due to a reinforcement part of a cover member less conspicuous while keeping the strength.SOLUTION: A double floor system W1 is formed through suspending a cover member 2 in a generally plate-like shape over between a plurality of support bodies 10. The cover member 2 comprises, on a base surface, a plurality of reinforcement parts 27 formed of long groove parts or hole parts. The reinforcement parts 27 consist only of components with a longitudinal direction generally parallel with one side of the cover member 2 and those with a longitudinal direction generally perpendicular thereto.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a double floor system, for example, a double floor system in which a cover member is spanned between a plurality of supports arranged on a floor base, and a finishing material is further placed on the cover member. [Background technology]

[0002] Double floor systems have been widely used as an essential technology for constructing comfortable office spaces, commercial facilities, etc. This double floor system is equipped with supports that stand on or are placed on the floor base, and a cover member that is placed across the supports, and a finishing material is placed on the upper surfaces of the supports and the cover member. In the above-mentioned double floor system, the underfloor space and the double floor surface are formed by supports and a cover member arranged to span between the supports.

[0003] However, because raised floor systems are exposed to various external forces during use, they need to be designed to have the appropriate strength to withstand these. For example, it is expected that external forces due to various factors, such as people walking, moving carts, and the installation of fixtures, will be applied to the raised floor system.

[0004] In order to satisfy this requirement for strength, the cover member needs to have a certain strength, and a method is known in which a steel plate with a thickness sufficient to provide the cover member with a certain strength is used. However, if the above method is simply adopted, a large amount of steel plate material is used, resulting in high material costs. Furthermore, the weight of the cover member is considerable, making it difficult to transport and install, and increasing construction costs. Therefore, the issue of reducing the amount of material used in the cover member is widely known, and a method of increasing strength by providing reinforcing parts is adopted. This is because by improving the strength structurally, it is no longer necessary to rely solely on the thickness of the steel plate, and the desired strength can be obtained with thinner steel plates.

[0005] Patent Documents 1 to 3 disclose configurations of double floor systems that include a cover member provided with a reinforcing portion that improves the above-mentioned strength.

[0006] The double floor system (free access floor) described in Patent Document 1 has a large reinforcing part (a reinforcing part formed with a large dimension) on a rectangular cover member (panel member). Specifically, the cover member (panel member) has a flat plate part and a rib (reinforcing part) with a concave cross-sectional shape (groove-shaped) formed on the flat plate part. The above-mentioned rib has two first ribs formed substantially parallel to each other and two second ribs extending in a direction substantially perpendicular to the first ribs and formed substantially parallel to each other, and the first ribs and the second ribs are formed in a large cross shape in which the grooves are continuous as the first ribs and the second ribs intersect each other so as to penetrate each other (see Figures 1 and 3 of Patent Document 1, etc.). That is, the rib (reinforcing part) of the cover member described in Patent Document 1 is formed in a shape in which a plurality of ribs intersect, and is large in which the grooves are continuous over the entire area except for the outer peripheral edge part of the upper surface of the cover member.

[0007] Furthermore, the double floor system (free access floor) described in Patent Document 2 discloses a configuration in which an X-shaped reinforcing section is provided by obliquely intersecting two reinforcing sections extending diagonally on a square cover member (wiring cover) supported at four points near the corners. Specifically, the cover member (wiring cover) comprises a face plate and an upright plate bent downward from the edge of the face plate, and a reinforcing section (rib) with a concave cross-sectional shape (groove-like) that forms an X-shape in plan view is formed on the diagonal of the face plate.

[0008] Furthermore, the double floor system (double floor) described in Patent Document 3 has a cover member (installation floor plate) that has a lower plate with a reinforcing groove (reinforcing portion) formed therein, and an upper plate (sheet material) with a flat upper surface (one surface). The cover member (installation floor plate) is constructed by placing the upper plate (sheet material) on the lower plate, and joining the upper plate (sheet material) at multiple points around the periphery by methods such as welding or crimping. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2008-223383 A [Patent Document 2] Japanese Patent Application Publication No. 11-324288 [Patent Document 3] Japanese Patent Application Publication No. 10-219981 Summary of the Invention [Problem to be solved by the invention]

[0010] The double floor system described in the above-mentioned Patent Documents 1 and 2 has the problem that, although the strength is improved by the reinforcing parts, as it is used, the finishing material falls (enters) into the groove-like parts of the reinforcing parts provided on the cover member, and grooves similar to those in the reinforcing parts are formed on the upper surface of the finishing material (hereinafter, in this application, the grooves formed in this finishing material are referred to as "traces"), which deteriorates the appearance of the floor surface.

[0011] Specifically, the reinforcing portion of the cover member described in Patent Document 1 is a large one in which multiple ribs (groove-shaped ribs) intersect and grooves are continuously formed over the entire area of ​​the top surface of the cover member except for the outer periphery (a large reinforcing portion is formed). This reinforcing portion configuration means that when a double floor system is used, the finishing material placed on the cover member is likely to fall into the groove-shaped portion of the reinforcing portion. In particular, the diagonal length of the approximately square depression at the intersection of the ribs is greater than the width of the rib alone, so that a visually noticeable "large mark" is formed when the double floor system is used. Furthermore, the reinforcing portion of the cover member described in Patent Document 2 has a structure in which two ribs (groove-shaped ribs) that are diagonal to one side of the square cover member cross. This structure is known to be effective in reinforcing cover members that are supported at four corner points, but when a double floor system is used and the finishing material placed on the cover member falls into the groove-shaped portion, a visually noticeable "diagonal trace" is formed. In this way, the reinforcing parts described in Patent Documents 1 and 2 are intended purely to improve the strength of the material, and the marks left by these reinforcing parts are very noticeable. These noticeable marks mar the beauty of the finishing material, and are therefore not desirable in terms of appearance.

[0012] On the other hand, the double floor system described in Patent Document 3 mentioned above has an upper plate (sheet material) with a flat upper surface interposed between the lower plate, in which the reinforcing groove (reinforcing portion) is formed, and the finishing material, thereby preventing the finishing material from coming into direct contact with the groove in the reinforcing portion and leaving no marks on the finishing material. However, the double floor system described in Patent Document 3 requires an additional sheet material to cover the lower board in which the reinforcing groove (reinforcing section) is formed, which inevitably results in increased costs in terms of both material costs and construction labor. This creates a problem in that, despite the reinforcing section being provided with the aim of reducing costs, costs end up increasing instead.

[0013] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a double floor system that maintains strength while making traces of finishing materials left by the reinforcing parts of the cover members less noticeable. [Means for solving the problem]

[0014] In a first aspect of the present invention, which has been made to solve the above problems, a double floor system is provided in which a substantially plate-shaped cover member is stretched between a plurality of supports to form a floor surface, and a finishing material is placed on the upper surface of the floor surface. The cover member is provided in a plurality of types, Approximately square or cross-shaped in plan view, The cover member has a plurality of reinforcing parts on its base surface, the reinforcing parts being composed of elongated grooves or elongated holes having a structure in which the finishing material is sunk, and in all of the plurality of cover members having the plurality of reinforcing parts, the plurality of reinforcing parts include only those in which the plurality of reinforcing parts are elongated in directions substantially parallel to each other and directions substantially perpendicular to each other and do not intersect with each other, Moreover, only the reinforcing portion is formed in the vicinity of at least the edge and parallel to the edge, The finishing material is characterized in that it has a visual pattern having a predetermined direction and is arranged so that the predetermined direction is approximately parallel to or approximately perpendicular to the longitudinal direction of one of the reinforcing parts.

[0015] Thus, in the first aspect of the present invention, in all of the cover members having a plurality of reinforcing parts, the reinforcing parts include only those that are elongated in directions substantially parallel and perpendicular to each other and do not intersect with each other. The first aspect of the present invention does not have a large reinforcing part (a large reinforcing part in which grooves are continuously formed over the entire area except for the outer peripheral edge of the upper surface of the cover member) or a shape that is oblique to one side of the cover member, as in the above-mentioned conventional technology (the configurations described in Patent Documents 1 and 2). Furthermore, the present invention does not have a "rib intersection" as in the invention described in Patent Document 1, and is configured such that no grooves larger than the width of the rib alone are formed. According to the configuration of the reinforcing part of the present invention, visually noticeable "large marks" or "diagonal marks" as in the above-mentioned conventional techniques (configurations described in Patent Documents 1 and 2) are not formed, and the marks can be made less noticeable. Furthermore, according to the configuration of the present invention, there is no need to provide a sheet material as in the invention described in Patent Document 3, and costs can be reduced compared to the invention described in Patent Document 3. In other words, according to the first aspect of the present invention, a raised floor system can be provided at low cost, in which the strength of the cover member is maintained while traces of the finishing material are less noticeable.

[0016] Furthermore, in the configuration of the first aspect of the present invention, the reinforcing portions of the cover member are composed only of elongated portions in directions parallel to and perpendicular to the specified direction of the visual pattern of the finishing material, so that any marks formed on the finishing material due to these effects can be made less noticeable, just like the seams of the finishing material.

[0017] In addition, a second aspect of the present invention is a double floor system in which a substantially plate-shaped cover member is stretched between a plurality of supports to form a floor surface, and a finishing material is placed on the upper surface of the floor surface. The cover member is provided in a plurality of types, and the cover member is: Approximately square or cross-shaped in plan view,The cover member has a plurality of reinforcing parts on its base surface, the reinforcing parts being composed of elongated grooves or elongated holes having a structure in which the finishing material is sunk, and in all of the plurality of cover members having the plurality of reinforcing parts, the plurality of reinforcing parts include only those in which the plurality of reinforcing parts are elongated in directions substantially parallel to each other and directions substantially perpendicular to each other and do not intersect with each other, Moreover, only the reinforcing portion is formed in the vicinity of at least the edge and parallel to the edge, The finishing material is characterized in that it is approximately rectangular and arranged so that one side of the finishing material is approximately parallel to or approximately perpendicular to the longitudinal direction of one of the reinforcing parts. In addition, a third aspect of the present invention is a double floor system in which a floor surface is formed by spanning a number of supports with a cover member of an approximately plate-like body, and a finishing material is placed on the upper surface of the cover member, the cover member being approximately square or approximately cross-shaped in plan view, and having a number of reinforcing sections on its base surface consisting of elongated grooves or elongated holes structured so that the finishing material can sink into them, the multiple reinforcing sections include only those that are elongated in approximately parallel and approximately perpendicular directions to each other and do not intersect with each other, the cover member has at least reinforcing sections parallel to the edges formed near its edges, and in its central portion, the multiple reinforcing sections are formed in an approximately rectangular or approximately cross shape in plan view, and the finishing material has a visual pattern having a predetermined direction, and is arranged so that the predetermined direction is approximately parallel or approximately perpendicular to the elongated direction of one of the reinforcing sections. In addition, a fourth aspect of the present invention is a double floor system in which a floor surface is formed by spanning a number of supports with a cover member of an approximately plate-like body and a finishing material is placed on the upper surface of the cover member, the cover member being approximately square or approximately cross-shaped in plan view and having a number of reinforcing sections on its base surface which are composed of elongated grooves or elongated holes structured so that the finishing material can sink into them, the multiple reinforcing sections include only those which are elongated in approximately parallel and approximately perpendicular directions to each other and do not intersect with each other, the cover member has at least reinforcing sections formed in the vicinity of its edges which are parallel to the edges, and in its central portion, the multiple reinforcing sections are formed in an approximately rectangular or approximately cross shape in plan view, and the finishing material is approximately square and arranged so that one side of the finishing material is approximately parallel or approximately perpendicular to the elongated direction of one of the reinforcing sections.

[0018] Thus, the second aspect of the present invention 、3、4 In the embodiment, as in the first embodiment described above, compared to the above-mentioned conventional techniques (the configurations described in Patent Documents 1 and 2), the marks formed on the finishing material placed on the cover member can be made less noticeable. 、3、4 This embodiment, like the above-mentioned first embodiment, can reduce costs as compared to the invention described in Patent Document 3.

[0019] In addition, the above items 1 and 2 、3、4 In this aspect, it is desirable that the cover member has a protrusion, and that the protrusion is provided so as to be positionable with respect to the support body.

[0020] With this configuration, even if the cover member of the double floor system is subjected to a load, the cover member will remain in the optimal position, and will not shift out of place and come off, allowing the desired strength to be exerted, providing a more stable, low-cost double floor system that leaves less noticeable marks. Effect of the Invention

[0021] According to the present invention, a double floor system can be provided at low cost that maintains strength while making traces of finishing materials less noticeable due to the reinforcing parts of the cover members. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a double floor system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram showing a cross section taken along the line AA in FIG. [Diagram 3] 1 is a schematic diagram showing a cover member that constitutes the double floor system of the first embodiment of the present invention, viewed diagonally from above. FIG. [Figure 4] 5A and 5B are schematic diagrams for explaining the cross-section of the cover member that constitutes the double floor system of the first embodiment of the present invention, where (a) is a schematic diagram showing the cross-section along the line BB of FIG. 3, and (b) is a schematic diagram showing the cross-section along the line CC of FIG. 3. [Diagram 5] 2 is a schematic diagram for explaining the arrangement of the reinforcing parts of the cover members that constitute the double floor system of the first embodiment of the present invention and their effects. FIG. [Figure 6] 1 is a schematic diagram showing a first modified example of a cover member that constitutes the double floor system of the first embodiment of the present invention. FIG. [Figure 7] A schematic diagram showing a second modified example of the cover member that constitutes the double floor system of the first embodiment of the present invention. [Figure 8] 8 is a schematic diagram for explaining a cross section of the cover member shown in FIG. 7, and is a schematic diagram showing a cross section taken along the line DD in FIG. 7. [Figure 9] 8A and 8B are schematic diagrams for explaining an engagement portion of a second modified example of the cover member shown in FIG. 7, in which (a) is a schematic diagram showing the engagement portion of the first embodiment shown for comparison to explain the configuration of the second modified example, and (b) is a schematic diagram showing the engagement portion of the second modified example. [Figure 10] FIG. 4 is a schematic diagram showing the configuration of a second embodiment of the present invention. [Figure 11] FIG. 13 is a schematic diagram showing a configuration of a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, a double floor system according to embodiments (first to third embodiments) of the present invention and a cover member constituting the double floor system will be described with reference to the drawings.

[0024] First Embodiment First, a double floor system according to a first embodiment of the present invention and a cover member constituting the double floor system will be described with reference to Figs. 1 to 5. Here, Fig. 1 is a schematic diagram showing the configuration of the double floor system of the first embodiment, and Fig. 2 is a schematic diagram showing the cross section along the line AA in Fig. 1. Fig. 3 is a schematic diagram showing the cover member constituting the double floor system of the first embodiment as viewed from diagonally above. Fig. 4 is a schematic diagram for explaining the cross section of the cover member constituting the double floor system of the first embodiment, where (a) is a schematic diagram showing the cross section along the line BB shown in Fig. 3, and (b) is a schematic diagram showing the cross section along the line CC shown in Fig. 3. Fig. 5 is a schematic diagram for explaining the arrangement of the reinforcing part of the cover member constituting the double floor system of the first embodiment and its effect.

[0025] As shown in Fig. 1, the double floor system W1 of the first embodiment is constructed by laying a mat body 1 formed to a predetermined dimension on a floor base 5, thereby connecting the wiring spaces 16 formed between the multiple supports 10 formed on the mat body 1 with the adjacent mat bodies 1 to form a single continuous wiring space, and by arranging the cover members 2 (2a, 2b, 2c) above this continuous wiring space 16 to form a double floor surface. The double floor system W1 is also designed to be used by placing a finishing material 3 on the upper surface 11 of the supports 10 provided on the mat body 1 and the upper surface 21 of the cover member 2. Below, each component of the double floor system W1 of the first embodiment will be described in detail.

[0026] First, the mat body 1 constituting the double floor system W1 of the first embodiment will be described. 1 and 2, the mat body 1 has a rectangular sheet-like base 1a (see FIG. 1), and a plurality of block-shaped (approximately rectangular) supports 10 are provided on the upper surface of the base 1a in a regularly-spaced arrangement in the vertical and horizontal directions with a predetermined interval (gap) between them. The mat body 1 also forms a wiring space 16 by the gap between adjacent supports 10.

[0027] In the example shown in FIG. 1, three different sizes of supports 10 (10a, 10b, 10c) are provided on the mat body 1. Specifically, a full-size support 10a is formed in the center of the base 1a, and four supports 10b each having a size that is one-quarter of the full-size support 10a are provided at the four corners of the base 1a. In addition, four supports 10c each having a size that is one-half the full-size support 10a are provided on the four edges of the base 1a. In this way, by arranging supports 10 of multiple sizes on the base 1a, a cross-shaped wiring space 16 is formed in the mat body 1. In addition, the mat body 1 forms a wiring space 16 between multiple support bodies 10, and this wiring space 16 includes a passage portion formed between opposing support bodies 10 and an intersection portion formed where two passage portions intersect.

[0028] The mat body 1 constructed as described above has openings for the wiring spaces 16 formed on its edges, so that when the mat bodies 1 are laid out, the openings on the edges of the adjacent mat bodies 1 match, and the wiring spaces 16 communicate with each other to form an integrated wiring space. This integrated wiring space is formed in a grid shape (a lattice-like, square-like, or other grid shape) as a whole, so that sufficient wiring capacity can be ensured.

[0029] In the case of the mat body 1 shown in Figure 1, when the mat bodies 1 are laid out one on top of another, the non-full-size supports 10b, 10c and the non-full-size supports 10b, 10c of other adjacent mat bodies 1 become integrated to form approximately the same shape as the full-size support 10a. However, a half-size support 10c is placed on the mat body 1 placed at the end (end other than the corner) of the double floor system W1, and a quarter-size one is placed on the mat body 4 placed at the corner of the double floor system 1. Also, when the mat body 1 is placed to avoid structures such as pillars, a mat body provided with a three-quarter-size support (not shown) is placed.

[0030] Moreover, the wiring space 16 formed in the mat body 1 is adapted to be covered at its upper part by a cover member 2 (2a, 2b, 2c) placed on the support body 10. In order to place the cover members 2 (2a, 2b, 2c), a step portion 12 is formed on the upper surface 11 of the support body 10, which is recessed below the upper surface 11 by "a dimension obtained by adding the approximate thickness dimension of the cover member 2 and the approximate thickness dimension of the cushioning material 25 (see FIG. 2) provided on the cover member 2." This step portion 12 is formed along the wiring space 16 on the wiring path space 16 side of the support body 10. The cover members 2 (2a, 2b, 2c) are designed so that when placed across adjacent supports 10 (placed state), their width is wider than the wiring space 16 formed by the gap between the supports 10. When the cover members 2 (2a, 2b, 2c) are placed on the step portion 12 of the support 10, the upper surface 11 of the support 10 and the upper surface 21 of the cover members 2 (2a, 2b, 2c) become flush with each other to form a double floor surface.

[0031] Then, the cover members 2 (2a, 2b, 2c) are placed on the support 10 to form a flush double floor surface, and the finishing material 3 is placed on the surface. This finishing material 3 is a roughly rectangular component, and multiple sheets are laid out. Normally, the finishing material 3 is placed in alignment with the grid formed by the support 10 so that the grid formed by the support 10 and the grid formed by the joints of adjacent finishing materials 3 are not inclined.

[0032] Furthermore, in the first embodiment, the support 10 is provided with a recessed portion (notch) 18 (see FIG. 1) that engages with a locking portion (protrusion) 23 (see FIG. 1 and FIG. 3) provided on the cover member 2 (the locking portion 23 will be described later). The recessed portion 18 is recessed downward from the step portion 12 at a predetermined position of the step portion 12 of the support 10, and has a concave shape. Due to the recess 18, when the cover member 2 is placed on the step portion 12 of the support body 10, the recess 18 engages with the locking portions 23 (23a, 23b, 23c, 23d), thereby positioning the cover member 2 and preventing "misalignment and rattling" of the cover member 2. Thus, according to this embodiment, simply by placing the cover member 2 on the step portion 12 of the support body 10, the locking portions 21 of the cover member 2 engage with the recess 18, and the effect of preventing misalignment can be easily achieved.

[0033] The above-mentioned configuration of the mat body 1 is merely one example. For example, the shape of the wiring space 16 in the mat body 1 and the arrangement of the supports 10 are designed as appropriate. For example, the supports 10b may be arranged at the four corners of the mat body to form the wiring space 16 like a cross. Furthermore, regardless of the design of the wiring space 16, the mat bodies 1 themselves may be arranged at a predetermined distance apart rather than adjacent to each other to form a wiring space between the mat bodies 1, and any design may be used as long as a wiring space is formed.

[0034] In addition, in the above-mentioned mat body 1, a step portion 12 is provided continuously along the wiring space 16 of the support body 10, and the cover members 2 (2a, 2b, 2c) are placed on this, but the step portions 12 may be provided discontinuously, and the cover members 2 (2a, 2b, 2c) may be provided with protrusions that engage with the step portions 12. As long as the cover members 2 (2a, 2b, 2c) can be supported by the support body 10, any suitable placement configuration may be used.

[0035] Furthermore, the support 10 constituting the above-mentioned mat body 1 is of a laying type, and its upper surface 11 also constitutes a double floor surface, but is not particularly limited to this. For example, any suitable configuration may be used as long as it is capable of placing the cover member 2 (or a cover member that performs the same function as the cover member 2), such as a laying type double floor in which the cover member 2 is laid out and the double floor surface is formed only by the cover member 2, or a double floor in which the support is of a level-adjustable leg type.

[0036] Next, the cover members 2 (2a, 2b, 2c) constituting the double floor system W1 of the first embodiment will be described.

[0037] As shown in Fig. 1, the cover member 2 (2a, 2b, 2c) is formed in a substantially rectangular plate shape, one surface of which is an upper surface 21 that forms a floor together with the upper surface 11 of the support 10, and the other surface is a lower surface 22 (see Fig. 2) that faces the wiring space 16. In addition, the cover member 2 (2a, 2b, 2c) is formed with a plurality of long groove-shaped reinforcing parts 27 (reinforcing parts formed by groove parts) that are recessed from the upper surface 21 toward the lower surface 22. Each of the multiple reinforcing parts 27 is formed such that the longitudinal direction is substantially parallel or substantially perpendicular to one side of the cover member 2 (2a, 2b, 2c).

[0038] As shown in Fig. 2, the cover members 2 (2a, 2b, 2c) are provided with cushioning material 25 near the end of the back surface 22. This cushioning material 25 is interposed in the contact portion between the cover members 2 and the support 10, and prevents the support 10 and the cover members 2 (2a, 2b, 2c) from being misaligned in the vertical direction. The cushioning material 25 also prevents the generation of noise due to sliding between the cover members 2 (2a, 2b, 2c) and the support 10, or between the cover members 2a, 2b, 2c. The cushioning material 25 is not shown in any figures other than Fig. 2.

[0039] As shown in Fig. 1, of the cover members 2a, 2b, and 2c, the cover member 2a is disposed above an intersection (intersection space) of wiring spaces 16 formed in the mat body 1, and is bridged across four supports 10 near the intersection space of the wiring spaces 16. Specifically, the cover member 2 is supported by placing four corners of its substantially rectangular shape on step portions 12 of the supports 10 (the entire cover member 2a is supported by the four supports 10). 1, the cover members 2b and 2c are bridged between two adjacent supports 10 across one wiring space 16 formed in the mat body 1. Specifically, the cover members 2b and 2c are supported by placing two opposing edges of a substantially rectangular shape on the supports 10 (the entire cover members 2b and 2c are supported by the two supports 10). The cover members 2a, 2b, and 2c will be described in order below.

[0040] First, the cover member 2a will be described. The cover member 2a is made by processing a substantially rectangular steel plate. The cover member 2a has an outer shape in which the four sides of the substantially square steel plate extend outward, and a plurality of reinforcing parts 27 are formed by press molding (see FIG. 3). Specifically, as shown in Fig. 3, cover member 2a is formed by providing smaller square cutouts at the four corners of a square steel plate, with the corners on the central side being formed as hypotenuses (which may also be considered a roughly cross shape formed by extending the four sides of an octagonal steel plate). Cover member 2a also has locking portions 23a, 23b, 23c, and 23d formed at the corners of the cutouts at the four corners, each of which is formed as a hypotenuse. In addition, the cover member 2 is shaped to cover (enclose) the intersection of the wiring space 16 formed in the mat body 1, so that its four edges 31, 32, 33, and 34 protrude outward from its approximately rectangular shape so as to slightly overlap the passage portion. In the cover member 2a, the edge 31 is formed in a direction parallel to the edge 33, and the edge 31 is formed in a direction perpendicular to the edges 32 and 34. In the cover member 2a, the edge 32 is formed in a direction parallel to the edge 34, and the edge 32 is formed in a direction perpendicular to the edges 31 and 33.

[0041] In addition, the above-mentioned engagement portions 23a, 23b, 23c, and 23d are formed by press molding into a semi-conical shape with a size sufficient to fit into the space of the recessed portion 18 provided in the support body 10 of the above-mentioned mat body 1, and protrude from the underside 22 of the cover member 2. Furthermore, since the engaging portions 23a, 23b, 23c, and 23d protrude from the underside 22 of the cover member 2a, when the cover member 2a is placed on the mat body 1 (in-use state), the engaging portions 23a, 23b, 23c, and 23d fit into the recessed portions 18 and interfere with the mat body 1, thereby preventing the cover member 2 from shifting horizontally.

[0042] Next, with reference to FIG. 5, the arrangement of the reinforcing portion 27 of the cover member 2a will be described in relation to the load applied to the cover member 2a.

[0043] The cover member 2a has both sides sandwiching the locking portions 23a, 23b, 23c, and 23d serving as supported points (supported portions) 38, 39, 40, and 41 that are supported by the support body 10. When the cover member 2a is placed on the support body 10, the supported points (supported portions) 38, 39, 40, and 41 in the vicinity of the locking portions 23a, 23b, 23c, and 23d are supported by the step portion 12 of the support body 10. Furthermore, when the cover member 2 is placed on the support 10, the edges 31, 32, 33, 34 are suspended between the above-mentioned supported portions 38, 39, 40, 41 (i.e., when the cover member 2 is placed on the support 10, it is supported by the four supported points 38, 39, 40, 41, and the edges 31, 32, 33, 34 are suspended).

[0044] Specifically, when the cover member 2a is placed on the support body 10, adjacent supported portion (first supported portion) 38 and supported portion (second supported portion) 39 of the four supported portions 38, 39, 40, 41 are supported by the support body 10, and the edge (first edge portion) 31 sandwiched between the supported portion 38 and the supported portion 39 is in an imaginary state. Furthermore, when the cover member 2a is placed on the support body 10, the supported portion (first supported portion) 38 and the other supported portion (third supported portion) 41 adjacent to the supported portion (first supported portion) 38 other than the supported portion (second supported portion) 39 are supported by the support body 10, and the edge (second edge portion) 34 sandwiched between the supported portion 38 and the supported portion 41 is in an imaginary state. Furthermore, when the cover member 2a is placed on the support body 10, the supported portion (second supported portion) 39 and the other supported portion (fourth supported portion) 40 adjacent to the supported portion (second supported portion) 39 other than the supported portion (first supported portion) 38 are supported by the support body 10, and the edge (third edge portion) 32 sandwiched between the supported portion 39 and the supported portion 40 is in an imaginary state. Furthermore, when the cover member 2a is placed on the support body 10, the supported portion (third supported portion) 41 and the other supported portion (fourth supported portion) 40 adjacent to the supported portion (third supported portion) 41 other than the supported portion (first supported portion) 38 are supported by the support body 10, and the edge (fourth edge portion) 33 sandwiched between the supported portion 40 and the supported portion 41 is in an imaginary state.

[0045] Furthermore, because the double floor system W1 receives loads from people walking and the installation of fixtures on its top surface, the areas with the weakest strength are the central parts (four parts) of the edges 31, 32, 33, 34 of the cover member 2a in an aerial state and their vicinity, and the central part (one part) of the entire cover member 2. For this reason, in strength tests of cover members constituting a double floor product such as a double floor system, the central parts and their vicinity of the edges of the cover member and the central part of the entire cover member are generally the targets of the strength tests.

[0046] Furthermore, the load placed on the cover member 2 of the double floor system W1 is particularly problematic due to the load placed on fixtures, and generally the contact area of ​​the parts that come into contact with the floor surface, such as the base caps of fixtures, is roughly the same as a circle with a radius of 50 mm. Therefore, in double floor products, it is important that the desired strength is obtained when the double floor is pressed by a circular presser with a radius of 50 mm.

[0047] 5, when the center of the entire cover member 2a is pressed with a presser with a radius of 50 mm (the circular dashed line indicated by reference numeral 129 in the figure indicates the pressing surface of the presser), the arcs 125, 126, 127, and 128 indicated by dashed lines in the figure become the parts most susceptible to deformation. In other words, when the four edges of the cover member 2a are in an imaginary state, the four arcs 125, 126, 127, and 128 are generated as parts that are susceptible to deformation due to the influence of the load. Furthermore, if the wiring space 16 covered by the cover member 2a is a T-junction rather than a cross and the edge 33 is supported by some kind of support, the two arcs 125, 126 will be subjected to a large load and will be prone to deformation.

[0048] These easily deformed portions (arcs 125 to 128) are generated due to the positional relationship between supported portions 38, 39, 40, 41 and the pressing point in the center of cover member 2a, and will be generated even if cover member 2a has a general shape other than a substantially square, such as a polygon or circle.

[0049] In this embodiment, in the above-mentioned cover member 2a, in five areas which are easily deformed under the influence of load, reinforcing portions 27 are provided at the positions shown below, taking into consideration that traces will be less noticeable.

[0050] 5, in the first embodiment, in order to improve the strength of arcs 125, 126, 127, 128 that are easily deformed near the central portions of edges 31, 32, 33, 34 of cover member 2a, four reinforcing parts 27 (27a, 27b, 27c, 27d) are arranged in a substantially delta shape for each of edges 31, 32, 33, 34 of cover member 2a. That is, the four reinforcing parts 27 are arranged in a delta shape for each of edges 31, 32, 33, 34 of cover member 2a such that the apex side of the delta shape is located on the edge side and the base side of the delta shape is located on the central side of cover member 2a. Further, the reinforcing portions 27 (27a, 27b, 27c, 27d) arranged in a delta shape are provided so as to be arranged so as to be elongated in a direction substantially parallel to the corresponding edges 31, 32, 33, .

[0051] This configuration in which reinforcing portion 27a is the apex and reinforcing portions 27c and 27d are the bases, in a substantially delta shape, provides an effective reinforcing effect for arcs 125, 126, 127, and 128, which are the weakest portions of cover member 2a. Furthermore, according to the configuration of the reinforcing portions 27 (27a, 27b, 27c, 27d) arranged in the above-mentioned delta shape, it is possible to improve the strength of the portions that are easily deformed (arcs 125, 126, 127, 128) without providing a large reinforcing portion with continuous grooves, and it is possible to provide a cover member 2a for a double floor system that has sufficient strength using board material of conventional thickness.

[0052] In addition, the reinforcing portions 27 (27a, 27b, 27c, 27d) arranged in the above-mentioned delta shape are configured to prevent the formation of visually noticeable "large marks" such as those in the "large reinforcing portion with continuous grooves" described in Patent Document 1, and to make the marks less noticeable. In addition, the reinforcing portions 27 (27a, 27b, 27c, 27d) arranged in the above-mentioned delta shape are provided so as to be elongated in a direction approximately parallel to the corresponding edges 31, 32, 33, 34, so that "diagonal traces" are not formed, making the traces less noticeable.

[0053] The reinforcing portions 27 (27a, 27b, 27c, 27d) formed in the delta shape can be formed, for example, by arranging them at the positions shown below.

[0054] Specifically, a reinforcing portion 27a is formed in the vicinity of the approximate center of edge 31 of cover member 2a, with the longitudinal direction being parallel to edge 31. One end side in the longitudinal direction of reinforcing portion 27a is provided so as to intersect with an arc 125 that deviates toward edge 34 on the inside of cover member 2a. The other end side in the longitudinal direction of reinforcing portion 27a is provided so as to intersect with an arc 126 that deviates toward edge 32 on the inside of cover member 2a. Further, near approximately the center of the edge 31 of the cover member 2a, a reinforcing portion 27b is formed at a position spaced a predetermined distance from the reinforcing portion 27a toward the center of the cover member 2a. Similar to the reinforcing portion 27a, the reinforcing portion 27b is provided so that one end side in the longitudinal direction intersects with an arc 125 that deviates toward the edge 34 on the inside of the cover member 2. Similarly to the reinforcing portion 27a, the reinforcing portion 27b is provided so that the other end side in the longitudinal direction intersects with an arc 126 that deviates toward the edge 32 on the inside of the cover member 2. Further, in the vicinity of the approximate center of the edge 31 of the cover member 2a, a reinforcing portion 27c is formed at a position spaced a predetermined distance toward the center of the cover member 2a from the reinforcing portion 27b and slid toward the edge 34. The reinforcing portion 27c is provided such that its central portion in the longitudinal direction intersects with the arc 125 of the cover member 2. Further, in the vicinity of the approximate center of the edge 31 of the cover member 2a, a reinforcing portion 27d is formed at a position spaced a predetermined distance toward the center of the cover member 2a from the reinforcing portion 27b and slid toward the edge 32. The reinforcing portion 27d is provided so that its central portion in the longitudinal direction intersects with the arc 126 of the cover member 2.

[0055] In addition, the reinforcing portions 27 (27a, 27b, 27c, 27d) formed in a delta shape and provided approximately near the center of the edge 31 of the cover member 2a are all formed with their longitudinal directions approximately parallel to the edge 31 (formed parallel to the x direction in the figure). In addition, in the reinforcing portion 27 (27a, 27b, 27c, 27d) formed in a delta shape approximately near the center of the edge 31, the reinforcing portions 27a and 27b are at the same position in the direction along the edge 31 (the x direction in the figure), and are arranged at a predetermined interval (arranged in parallel) in the direction along the edge 34 perpendicular to the edge 31 (the y direction). In addition, in the reinforcing portion 27 (27a, 27b, 27c, 27d) which is formed in a delta shape approximately near the center of the edge 31, the reinforcing portion 27c and the reinforcing portion 27d are at the same position in the direction along the edge 34 (y direction) and are arranged at a predetermined interval in the direction along the edge 31 (x direction in the figure) (arranged in series).

[0056] In addition, near the approximate centers of the other edges 32, 33, and 34 of the cover member 2a, multiple reinforcing portions 27a, 27b, 27c, and 27d are arranged in a delta shape so as to intersect with arcs 125-128, which are parts that are easily deformed, similar to the reinforcing portion 27 (27a, 27b, 27c, and 27d) near the approximate center of the edge 31.

[0057] The cover member 2a is also provided with reinforcing portions 27 (27e, 27f, 27g, 27h) at the panel center. This is because the contact portion of the presser (the outer circle of the contact portion indicated by the dashed circular line 129) is also the weakest deformation portion, similar to the arcs 125 to 128. In this embodiment, in order to suppress deformation of the panel center portion of the cover member 2a, a plurality of reinforcing portions 27e, 27f, 27g, 27h are provided so as to intersect with the outer circle of the contact portion of the presser (the outer circle indicated by the dashed circular line 129). The reinforcing portions 27e, 27f, 27g, and 27h are arranged so as to be elongated in either a direction substantially parallel to or substantially perpendicular to the edges 31, 32, 33, and .

[0058] The reinforcing portions 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h provided on the cover member 2a are all formed so that their longitudinal directions are either substantially parallel to or substantially perpendicular to the edges 31, 32, 33, and 34, and furthermore, are arranged so that they do not intersect with each other. In other words, since the cover member 2a does not have "intersections of grooves" as in the invention described in the above-mentioned Patent Document 1, grooves larger than the width of the reinforcing portions 27a, 27b, 27c, 27d, 7e, 27f, 27g, and 27h are not formed, making the remaining marks less noticeable.

[0059] Next, the cover members 2b and 2c will be described with reference to FIG. In the description of the cover members 2b and 2c, the same components as those of the cover member 2a described above are given the same reference numerals and the description thereof will be omitted.

[0060] As shown in the figure, the cover members 2b and 2c are formed by processing a substantially square steel plate, similar to the above-mentioned cover member 2a, into a substantially rectangular shape. The cover member 2c is formed to be half the size of the cover member 2b.

[0061] In addition, the length dimension (width dimension) of the short side edge of the cover member 2b is the same as the length dimension of the edges 31, 32, 33, and 34 of the cover member 2a, and multiple reinforcing portions 27 are formed whose long side direction is approximately parallel to the short side edge. The cover member 2c has a length dimension (width dimension) of the longitudinal edge that is the same as the length dimension of the edges 31, 32, 33, and 34 of the cover member 2a, and is formed with a plurality of reinforcing parts 27 whose longitudinal direction is approximately parallel to the longitudinal edge. The reinforcing parts 27 are arranged so as not to intersect with each other.

[0062] In this embodiment, the reinforcing portion 27 of the cover member 2 (2a, 2b, 2c) is configured with a groove, but is not limited to this. The reinforcing portion 27 may have any structure, such as a recess or a hole, as long as it can improve the strength of the cover member 2 (2a, 2b, 2c) and allows the finishing material 3 to sink therein.

[0063] Next, we will explain why the configuration of the double floor system W1 of this embodiment makes traces less noticeable.

[0064] The cover member 2 (2a, 2b, 2c) of the first embodiment also has a groove-shaped reinforcing portion 27 formed on its upper surface 11, so that as the double floor system W1 is used, the finishing material 3 gradually sinks into the groove-shaped portion of the reinforcing portion 27, and groove-shaped traces (not shown) corresponding to the shape of the reinforcing portion 27 may appear on the upper surface of the finishing material 3. These traces are formed according to the groove shape of the reinforcing portion 27, so all of the reinforcing portion 27 on the cover member 2 is faithfully reproduced, including the arrangement, general shape, inclination, depth, etc. of the grooves. For example, the traces caused by the reinforcing portion 27 will naturally appear according to the dimensions of the width, length, and depth of the reinforcing portion 27. Therefore, the shape will be long in the length direction of the reinforcing portion 27. This is a phenomenon caused by all of the cover members 2 (2a, 2b, 2c) used in the double floor system W1, and the reinforcing portions 27 of the cover members 2a, 2b, 2c also cause traces to appear on the finishing material 3.

[0065] Incidentally, in the double floor system W1 of the first embodiment, the wiring space 16 is formed in a grid shape of a predetermined pattern (see FIG. 1). Therefore, when the wiring space 16 is covered with the cover members 2 (2a, 2b, 2c), the cover members 2 (2a, 2b, 2c) are arranged in a grid shape of a predetermined pattern. In addition, the finishing materials 3 are laid out along this grid with as little inclination as possible. Then, the joints, which are the boundaries between the laid out finishing materials 3, also form a grid that is not inclined with respect to the grid formed by the cover members 2 (2a, 2b, 2c).

[0066] The cover member 2a has reinforcing parts 27 on its surface 21 for the purpose of reinforcement, but the length direction of all reinforcing parts 27 is perpendicular or parallel to any of the edges 31, 32, 33, 34 of the cover member a, and none of them are oblique to the edges 31, 32, 33, 34. In addition, when the cover members 2b and 2c are placed on the support 10, the reinforcing parts 27 of the cover members 2b and 2c are also arranged perpendicular or parallel to any of the edges 31, 32, 33, 34 of the cover member a, and none of them are oblique to the edges 31, 32, 33, 34. In other words, none of the reinforcing parts 27 of the cover members 2a, 2b, 2c are oblique to the above-mentioned grid shape. Therefore, the multiple marks left by the cover members 2a, 2b, and 2c are exposed in a grid pattern on the finishing material 3, and their length directions are only parallel or perpendicular to the grid of the joints of the finishing material 3.

[0067] If any of the multiple marks have a length direction oblique to the grid of the joints of the finishing material 3, the oblique marks will be noticeable throughout the double floor system 1 on which the finishing material 3 is laid, which is undesirable in appearance. This means that if the reinforcing portion 27 of the cover member 2 includes any marks whose length direction is other than parallel to any of the edges 31, 32, 33, 34 or other than perpendicular, the finishing material 3 will have undesirable marks. However, in the first embodiment, as described above, only traces are formed whose length is parallel or perpendicular to the grid of the joints of the finishing material 3, so that the traces are less noticeable.

[0068] Furthermore, in this embodiment, a carpet tile is used as the finishing material 3. A carpet tile has grain (the flow of fibers on the surface of the finishing material that inevitably occurs during manufacturing) that allows a specific direction to be visually recognized, and the carpet tile is manufactured so that the grain direction is perpendicular or parallel to one side of the carpet tile.

[0069] In the first embodiment, the multiple reinforcing parts 27 are positioned so that their length direction is parallel or perpendicular to the grid of the joints of the finishing material 3, and therefore the multiple reinforcing parts 27 are also positioned so that their length direction is parallel or perpendicular to the grain of the finishing material 3. As a result, the traces of the finishing material 3 left by the reinforcing parts 27 also appear with their length direction parallel or perpendicular to the grain of the carpet. Furthermore, if there were any marks that were diagonal in the length direction relative to the grain direction of the finishing material 3, they would be very noticeable in appearance, but in the first embodiment, diagonal marks do not occur, so the marks are relatively inconspicuous.

[0070] Furthermore, when the finishing material 3 is a material that has a specific direction or pattern due to its structure, such as a carpet tile, the diagonal marks are particularly noticeable, so the first embodiment is expected to have the effect of suppressing the prominence of the marks, which is preferable. In addition, even when vinyl tiles or other finishing materials 3 are used, the marks can be made less noticeable as long as they have a certain visual pattern on the surface. According to the configuration of the first embodiment, there is no need to provide a sheet material as in the invention described in Patent Document 3, and therefore no increase in costs as in the invention described in Patent Document 3 is required.

[0071] <Cover part dimensions> Next, preferred dimensions of the reinforcing portion 27 of the cover member 2 will be described. The cover member 2a has a side length of 147 mm and a thickness of 2.3 mm. In the first embodiment, the finishing material 3 has a thickness of 6 mm.

[0072] The reinforcing portion 27 of the cover member 2a is preferably provided so that its width dimension (dimension Y shown in FIG. 4(b)) satisfies "Y≦9 mm." The reason for setting such a width dimension is as follows. Specifically, commercially available cover members having a reinforcing portion formed by a groove-shaped rib or the like generally have a reinforcing portion with a width dimension of 10 mm or more. In general, reinforcing portions with a width dimension of 10 mm or more tend to leave noticeable marks caused by the cover member entering the groove-shaped portion of the reinforcing portion. In response to this, during the product development process of the cover member 2, the inventors of the present application created a cover member 2a with a reinforcing portion 27 having a width dimension of "9 mm or less." As a result, they found that compared to a cover member with a width dimension of "10 mm or more," the reinforcing portion was less noticeable and the reinforcing effect was equivalent.

[0073] Furthermore, during the product development process of the cover member 2a, the inventors of the present application discovered that setting the length dimension of the reinforcing portion 27 of the cover member 2a (the dimension X shown in FIG. 4(a)) to "X≦45 mm" is preferable because it leaves less noticeable marks compared to reinforcing portions of cover members with a length of approximately one side in the prior art (prior art described in Patent Documents 1 and 2). A reinforcing portion with suitable strength can be obtained by setting the depth dimension (dimension Z shown in FIG. 4(a)) of the reinforcing portion 27 of the cover member 2a in the range of "Z≦2.5 mm". This is about 110% of the thickness dimension of the steel plate of the cover member 2a, and is the range in which suitable reinforcing strength can be obtained when the width and length are designed within the above-mentioned dimension range.

[0074] Furthermore, in the product development of the cover member 2a, the inventors of the present application have confirmed that it is even more preferable to set the width dimension of the reinforcing portion 27 of the cover member 2a in the ranges of "6 mm to 7 mm", the length dimension in the ranges of "20 mm to 30 mm", and the depth dimension in the ranges of "1.8 mm to 2.2 mm", in order to achieve the desired strength while suppressing traces. This is because the thickness of the finishing material 3 is 6 mm, and if the width is 7 mm or less, the marks left behind will be less noticeable. In addition, when the width of the cover member 2 is set to a certain range, the aforementioned length and depth ranges provide suitable strength and inconspicuousness. In particular, in the first embodiment, the width is set to 6.5 mm, the length to 25 mm, and the depth to 2 mm, providing a suitable design.

[0075] It should be noted that the above dimensions of the reinforcing portion 27 are merely examples, and it is natural that the above dimensional ranges can be used as a reference to select appropriate dimensions. Alternatively, if the cover member 2a is made from steel plates of different areas and thicknesses, it is sufficient to select an appropriate range taking into consideration the differences and ratios of the above dimensions, etc. Furthermore, it is not necessary for all of the multiple reinforcing portions 27 to have the same dimensions, and reinforcing portions with different widths, lengths, depths, or forming methods may be used in combination as appropriate. Also, although an example in which the reinforcing portions 27 in the delta arrangement are arranged in three rows has been shown, they may be arranged in two rows, or four or more rows as appropriate.

[0076] As described above, according to the first embodiment, it is possible to provide a double floor system W1 and a cover member 2 for the double floor system W1 at low cost, which maintain strength while making traces of the finishing material 3 less noticeable due to the reinforcing portion 27 of the cover member 2.

[0077] First Modification of the First Embodiment Next, a first modified example of the first embodiment will be described with reference to FIG. Here, Fig. 6 is a schematic diagram showing a first modified example of the cover member constituting the double floor system of the first embodiment. In the first modified example, the same components as those in the above-mentioned first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0078] In the illustrated first modified example, the cover member 2a of the first embodiment is changed to a cover member 2d, and the configuration other than the cover member 2d is the same as that of the first embodiment. Moreover, the cover member 2d of the first modified example is different from that of the first embodiment in the number and arrangement of the reinforcing parts 27, and the configuration other than that is the same as that of the first embodiment.

[0079] In the first embodiment, the relationship between the weakest part and the delta-arranged reinforcement part when the center of the cover member is pressed is explained. In the first modified example, however, the effect of the load received when pressing the center of the edges 31, 32, 33, 34 of the cover member with a circular presser (the same as in the first embodiment) with a radius of 50 mm is explained. In the first modified example, a plurality of reinforcing portions 27 (27a, 27i) are provided.

[0080] Specifically, the pressing tool is placed at the center of the edge 31 of the cover member 2d so that the pressing tool is generally included in the plane of the cover member 2d, and pressed (the circular broken line indicated by the reference numeral 129 indicates the pressing surface of the pressing tool). In this case, the semicircular line 135 (semicircular line) and the straight line 137 (straight line) shown in the figure are generated as the weakest parts in the cover member 2a.

[0081] In the first modified example, two reinforcing portions 27 (27a, 27i) are disposed in a substantially delta shape on each of the edges 31, 32, 33, and 34 of the cover member 2d. That is, in the cover member 2d, a delta-shaped reinforcing portion 27 is formed on each of the edges 31, 32, 33, and 34, with the reinforcing portion 27a at the apex and the reinforcing portion 27i at the base. The reinforcing portions 27 (27a, 27i) are formed so that their longitudinal directions are substantially parallel to the corresponding edges. The reinforcing portion 27i is formed so that its longitudinal length dimension is greater than that of the reinforcing portion 27i. The reinforcing portions 27a and 27i are disposed at a predetermined interval in the "y direction" in the figure. The reinforcing portion 27i is formed so that its longitudinal center is at the same position in the "x direction" in the figure as the longitudinal center of the reinforcing portion 27a.

[0082] Furthermore, in the cover member 2d of the first modified example, the reinforcing portion 27 (27a, 27i) is formed so that the reinforcing portion 27i intersects the semicircle 135 at an oblique angle at two points, and the reinforcing portion 27a and the reinforcing portion 27i are each perpendicular to the straight line 137 at one point. This configuration of the reinforcing portion 27 (27a, 27i) can effectively provide a deformation suppression effect on the weakest portion.

[0083] In the first modified example, the reinforcing portions 27 (27a, 27i) arranged in the delta shape are arranged so as to be elongated in a direction approximately parallel to the corresponding edges 31, 32, 33, 34, so that no "diagonal traces" are formed, and similar to the first embodiment described above, the configuration makes the traces less noticeable. The reinforcing portions 27a, 27f may be formed by grooves, recesses, holes, or any other structure. Also in the cover member 2a of the first embodiment, the reinforcing portions 27 arranged in a delta shape have the same effect as described in the first modified example. For example, when the edge 31 of the cover member 2a is pressed with a presser, the straight line 137 and the semicircle 135 are similarly generated as the weakest portions. In response to this, the reinforcing portions 27a, 27b, 27c, and 27d similarly exert the reinforcing effect on the weakest portions that the reinforcing portions 27a and 27i in the first modified example exert.

[0084] Second Modification of the First Embodiment Next, a second modified example of the first embodiment will be described with reference to FIG. Here, FIG. 7 is a schematic diagram showing a second modified example of the cover member constituting the double floor system of the first embodiment. FIG. 8 is a cross-sectional view along the arrow DD for explaining the locking portion of the second modified example shown in FIG. 7. FIG. 9 is a schematic diagram for explaining the locking portion of the second modified example of the cover member shown in FIG. 7, where (a) is a schematic diagram showing the locking portion of the first embodiment shown as a comparison for explaining the configuration of the second modified example, and (b) is a schematic diagram showing the locking portion of the second modified example. In the second modified example, the same components as those in the first embodiment described above are given the same reference numerals, and the description is omitted.

[0085] In the illustrated second modified example, the cover member 2a of the first embodiment is changed to a cover member 2e, and the shape of the hollowed-out portion 18 of the support body 10 is changed, but the other configurations are the same as those of the first embodiment. Also, the cover member 2e of the first modified example is changed to a locking portion 51 instead of the locking portion 23 of the cover member 2a of the first embodiment, but the other configurations are the same as those of the first embodiment.

[0086] 8, the locking portion 51 (protrusion) is formed by being extruded in a band shape in a direction perpendicular to the base surface (upper surface 21 and lower surface 22) of the cover member 2a, and is provided continuously to the top portion 51a, integral with the base surface of the cover member 2a at two bent portions 51b, 51b. Also, as shown in the figure, a hole portion 51h is formed between the top portion 51a and the lower surface 22, and is formed in an arch shape. Although not shown, the recessed portion (notch portion) 18 of the support body 10 is formed in a shape that receives and engages with the locking portion 51 (projection portion).

[0087] Specifically, in the above-described first embodiment, the locking portion 23 (23a, 23b, 23c, 23d) provided on the cover member 2a is formed in a semi-conical shape, and therefore, when viewed from above, a substantially triangular groove is formed as shown in Fig. 9(a). In contrast, the locking portion (protrusion) 51 of the second modified example is formed with the apex 51a extruded in a band shape having a certain width. According to the second modification, as shown in Fig. 9(b), when viewed from above, a rectangular groove is formed. Therefore, the mark left by the locking portion 51 is narrower than the mark left by the locking portions 23 (23a, 23b, 23c, 23d), and is less noticeable.

[0088] Second Embodiment Next, a double floor system and a cover member constituting the double floor system according to a second embodiment of the present invention will be described with reference to FIG. Here, Fig. 10 is a schematic diagram showing the configuration of the double floor system of the second embodiment. In the second embodiment, the same components as those in the first embodiment described above are given the same reference numerals, and the description thereof will be omitted.

[0089] The double floor system W2 of the second embodiment is configured such that a plurality of support bodies 210 are connected by a connecting portion 201 and arranged at a predetermined interval, and a plurality of cover members 220 are laid across the support bodies 210. The support bodies 210 are provided with a concave recessed portion 267. The recessed portion 267 is adapted to receive and engage with the bent portion 220F provided at the end of each edge of the cover member 220, and the support body 210 is further provided with a recessed portion 210H, into which the reinforcing portions 227j and 227k protruding from each of the four corners on the underside of the cover member 220 are inserted and engaged. The reinforcing portions 227j and 227k contribute to positioning as well as reinforcement, so that when the cover member 220 receives the supporting force from the support body 210, it can effectively receive the supporting force without deformation near the contact point.

[0090] Moreover, the cover member 220 of the second embodiment is formed in a rectangular plate shape, and is formed with a plurality of groove-shaped reinforcing portions 227 recessed from the upper surface to the lower surface.

[0091] Specifically, in the cover member 220, five reinforcing parts 227 (227a, 227b, 227c, 227d, 227e) are arranged in a substantially delta shape on each of the edges 231, 232, 233, 234. That is, the five reinforcing parts 227 (227a, 227b, 227c, 227d, 227e) are arranged in a delta shape on each of the edges 231, 232, 233, 234 of the cover member 220 such that the apex side of the delta shape is located on the edge side and the bottom side of the delta shape is located on the center side of the cover member 220. The reinforcing portions 227 (227a, 227b, 227c, 227d, and 227e) arranged in a delta shape are provided so as to be elongated in a direction substantially parallel to the corresponding edges 231, 232, 233, and 234.

[0092] Among the five reinforcing parts 227a, 227b, 227c, 227d, and 227e, the reinforcing part 227b is formed so that the length dimension in the longitudinal direction is the largest, and the reinforcing part 227d is formed so that the length dimension in the longitudinal direction is the smallest. The reinforcing parts 227c and 227e are the same size. The reinforcing parts 227c and 227e are formed so that the length dimension in the longitudinal direction is larger than that of the reinforcing part 227a. That is, the length dimensions in the longitudinal direction of the five reinforcing parts 227a, 227b, 227c, 227d, and 227e have the following relationship: "reinforcing part 227b>reinforcing part 227c=reinforcing part 227e>reinforcing part 227a>reinforcing part 227d." Similarly, the length dimensions in the width direction of the five reinforcing portions 227a, 227b, 227c, 227d, and 227e have the relationship "reinforcing portion 227a>reinforcing portion 227b>reinforcing portion 227c=reinforcing portion 227d=reinforcing portion 227e".

[0093] Further, reinforcing portions 227j, 227k are formed at the four corners of the cover member 220. The reinforcing portions 227j, 227k are provided protruding from the lower surface side of the cover member 220 and are adapted to engage with the recessed portion 267 of the support body 210. The reinforcing portions 227j, 227k are provided across an area that overlaps with the support body 210 and an area that overlaps with the area of ​​the cover member 210 in the aerial state, thereby increasing the strength and enabling the positioning of the cover member 210 relative to the support body 210.

[0094] Further, reinforcing portions 227f, 227g, 227h, and 227i are provided in the center of the entire cover member 220, which effectively suppress deformation of the center portion of the cover member 220, which is the weakest portion. Reinforcing portions 227f, 227g, 227h, and 227i are generally formed into a substantially rectangular shape, but when a presser with a radius of 50 mm is brought into contact with them, the boundaries of the reinforcing portions 227f, 227g, 227h, and 227i intersect obliquely with each other, effectively suppressing deformation.

[0095] Further, the reinforcing portions 227a to 227k in the second embodiment are all disposed such that their longitudinal direction is substantially parallel to or substantially perpendicular to one side (any one of the edges 231, 232, 233, and 234) of the cover member 220. Further, the reinforcing portions 227a to 227k are disposed so as not to intersect with each other.

[0096] In this second embodiment, like the first embodiment, no "large marks" or "diagonal marks" are formed, and like the first embodiment described above, the configuration makes the marks less noticeable. Furthermore, like the first embodiment described above, the configuration of the second embodiment does not require the provision of a sheet material as in the invention described in Patent Document 3, and does not result in increased costs as in the invention described in Patent Document 3. As described above, according to the second embodiment, it is possible to provide a double floor system W2 and a cover member 220 for the double floor system W2 at low cost, which maintains strength while making traces of the finishing material 3 less noticeable due to the reinforcing portion 227 of the cover member 220.

[0097] Third Embodiment Next, a double floor system and a cover member constituting the double floor system according to a third embodiment of the present invention will be described with reference to FIG. Here, Fig. 11 is a schematic diagram showing the configuration of the double floor system of the third embodiment. In the third embodiment, the same components as those in the first embodiment described above are given the same reference numerals, and the description thereof will be omitted.

[0098] The double floor system W3 of the third embodiment is configured such that a plurality of supports 310 are arranged at equal intervals and a cover member 320 is laid across them.

[0099] Moreover, the cover member 320 of the third embodiment is formed in a rectangular plate shape. In this cover member 320, three reinforcing portions 328 (328a, 328b, 328c) are arranged in a substantially delta shape on each of the edges 331, 332, 333, 334.

[0100] Specifically, for each of edges 331, 332, 333, and 334 of cover member 320, reinforcing portion 328a is arranged in a delta shape with the apex and reinforcing portions 328b and 328c at the base. With this configuration, deformation of the central vicinity portions of edges 331, 332, 333, and 334 of cover member 320, which are weaker in strength, can be effectively suppressed.

[0101] Although the reinforcing portions 328a, 328b, and 328c have an open reinforcing structure, if the finishing material 3 can be sunk, such a shape can also be effective. Further, the reinforcing portions 328a, 328b, and 328c are provided so as to be elongated in a direction substantially parallel to the corresponding edges 331, 332, 333, and 334.

[0102] Further, reinforcing portion 327 (327a, 327b, 327c, 327d) is provided in the center of cover member 320 as a whole, which effectively suppresses deformation of the center portion of cover member 65, which is the weakest portion. Reinforcing portions 327a, 327b, 327c, 327d generally form a cross shape, and when a presser with a radius of 50 mm is brought into contact with it, the boundaries of the cross and reinforcing portions 327a, 327b, 327c, 327d intersect obliquely with each other, thereby effectively suppressing deformation. The reinforcing portions 327a, 327b, 327c, and 327d are arranged such that their longitudinal direction is substantially parallel to or substantially perpendicular to one side of the cover member 320 (one side of the edges 331, 332, 333, and 334).

[0103] In this way, according to the configuration of reinforcing portions 327a, 327b, 327c, 327d, 328a, 328b, 328c of cover member 320 of the third embodiment, visually noticeable "large marks" such as the "large reinforcing portion with continuous grooves" described in Patent Document 1 are not formed, and the formation of visually noticeable marks can be suppressed. Further, the reinforcing portions 327a, 327b, 327c, 327d, 328a, 328b, and 328c of the cover member 320 in the third embodiment are arranged with their longitudinal directions substantially parallel to or substantially perpendicular to one side (any one of the edges 331, 332, 333, and 334) of the cover member 320. Therefore, in the third embodiment, "diagonal traces" are not formed, and the traces can be made less noticeable than those described in Patent Document 2. Furthermore, like the first embodiment described above, the configuration of the third embodiment does not require the provision of a sheet material as in the invention described in Patent Document 3, and does not result in increased costs as in the invention described in Patent Document 3.

[0104] As described above, according to the third embodiment, it is possible to provide a double floor system W3 and a cover member 320 for the double floor system W3 at low cost, which maintains strength while making traces of the finishing material 3 less noticeable due to the reinforcing parts 327, 328 of the cover member 320.

[0105] The double floor system of the present invention is not limited to the above embodiments (first to third embodiments), but includes those specified by combining partial configurations of each embodiment and the examples described in this specification, those specified by modifying the partial configuration of each embodiment, those specified by adding the partial configuration of the examples described in this specification to the configuration of each embodiment, and those specified by deleting the partial configuration of each embodiment.

[0106] In each of the above-described embodiments, the support body and the cover member are shown as separate members, but it is also possible to use a cover member in which the base surface and the support body are integral with each other, and a double floor system using this. [Explanation of symbols]

[0107] W1, W2, W3... Double floor system 3. Finishing materials 5...Floor base 1...Matte body 1a...Base 10(10a, 10b, 10c)...Support 11…Top surface 12...Step 16...Wiring space 18…Gouged part 2 (2a, 2b, 2c)...Cover member 21…Top surface 22…Bottom surface 23 (23a, 23b, 23c, 23d)...locking part 25…Cushioning material 27(27a, 27b, 27c, 27d, 27e, 27f, 27g, 27h, 27i)...Reinforcement part 31, 32, 33, 34…periphery 38, 39, 40, 41...Supported point (supported part) 51...Latching part 51a...top 51b...Bending part 51h…hole 125, 126, 127, 128... arc 129...Pressing surface of the pressing element 135…Line (semicircular line) 137...Line (straight line) 201...Connection part 210...Support 210H…Gouged part 220...Cover member 220F…Bending part 227 (227a, 227b, 227c, 227d, 227e, 227f, 227g, 227h, 227i, 227j, 227k)...Reinforcement part 231, 232, 233, 234...periphery 267…Gouged part 310...Support 320…Cover member 327(327a, 327b, 327c, 327d)...Reinforcement part 328(328a, 328b, 328c)...Reinforcement part 331, 332, 333, 334…periphery

Claims

1. In a double floor system in which a floor surface is formed by bridging a plurality of supports with a substantially plate-shaped cover member, and a finishing material is placed on the upper surface of the floor surface, The cover member is provided in plurality, The cover member has a substantially rectangular or cross shape in a plan view, and has a plurality of reinforcing portions on its base surface, the reinforcing portions being composed of elongated grooves or elongated holes into which the finishing material is sunk; In all of the plurality of cover members having the plurality of reinforcing portions, the plurality of reinforcing portions include only those in which the plurality of reinforcing portions are elongated in a direction substantially parallel to each other and a direction substantially perpendicular to each other and do not intersect with each other, and only the reinforcing portions parallel to the peripheral edge are formed at least in the vicinity of the peripheral edge, The finish has a visual pattern having a predetermined direction; A double floor system characterized in that the specified direction is arranged so as to be approximately parallel or approximately perpendicular to the longitudinal direction of one of the reinforcement parts.

2. In a double floor system in which a floor surface is formed by bridging a plurality of supports with a substantially plate-shaped cover member, and a finishing material is placed on the upper surface of the floor surface, The cover member is provided in plurality, The cover member has a substantially rectangular or cross shape in a plan view, and has a plurality of reinforcing portions on its base surface, the reinforcing portions being composed of elongated grooves or elongated holes into which the finishing material is sunk; In all of the plurality of cover members having the plurality of reinforcing portions, the plurality of reinforcing portions include only those in which the plurality of reinforcing portions are elongated in a direction substantially parallel to each other and a direction substantially perpendicular to each other and do not intersect with each other, and only the reinforcing portions parallel to the peripheral edge are formed at least in the vicinity of the peripheral edge, The finishing material is substantially rectangular, A double floor system characterized in that one side of the finishing material is arranged so that it is approximately parallel or approximately perpendicular to the long direction of one of the reinforcing parts.

3. In a double floor system in which a floor surface is formed by bridging a plurality of supports with a substantially plate-shaped cover member, and a finishing material is placed on the upper surface of the floor surface, The cover member has a substantially rectangular or cross shape in a plan view, and has a plurality of reinforcing portions on its base surface, the reinforcing portions being composed of elongated grooves or elongated holes into which the finishing material is sunk; The plurality of reinforcing parts include only those reinforcing parts that are elongated in a direction substantially parallel to each other and a direction substantially perpendicular to each other and do not intersect with each other, Furthermore, the cover member has at least the reinforcing portion formed in the vicinity of the edge thereof, the reinforcing portion being parallel to the edge, and a plurality of the reinforcing portions are formed in a central portion thereof so as to have a substantially rectangular or cross shape in a plan view, The finish has a visual pattern having a predetermined direction; A double floor system characterized in that the specified direction is arranged so as to be approximately parallel or approximately perpendicular to the longitudinal direction of one of the reinforcement parts.

4. In a double floor system in which a floor surface is formed by bridging a plurality of supports with a substantially plate-shaped cover member, and a finishing material is placed on the upper surface of the floor surface, The cover member has a substantially rectangular or cross shape in a plan view, and has a plurality of reinforcing portions on its base surface, the reinforcing portions being composed of elongated grooves or elongated holes into which the finishing material is sunk; The plurality of reinforcing parts include only those reinforcing parts that are elongated in a direction substantially parallel to each other and a direction substantially perpendicular to each other and do not intersect with each other, Furthermore, the cover member has at least the reinforcing portion formed in the vicinity of the edge thereof, the reinforcing portion being parallel to the edge, and a plurality of the reinforcing portions are formed in a central portion thereof so as to have a substantially rectangular or cross shape in a plan view, The finishing material is substantially rectangular, A double floor system characterized in that one side of the finishing material is arranged so that it is approximately parallel or approximately perpendicular to the long direction of one of the reinforcing parts.

5. The cover member has a protrusion, A double floor system as described in any one of claims 1 to 4, characterized in that the protrusion is arranged so as to be positionable relative to the support body.

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