JP7662214B2 - Double Floor System - Google Patents

Description

The present invention relates to a double floor system, for example, a double floor system in which a cover member is stretched across multiple supports arranged on a floor base, and a finishing material is then placed on top.

Double floor systems have been widely used as an essential technology for constructing comfortable office spaces, commercial facilities, etc. This double floor system comprises supports that stand 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.

However, because raised floor systems are exposed to various external forces during use, they must be designed to have the appropriate strength to withstand these. For example, it is anticipated that external forces will be applied to raised floor systems due to a variety of factors, including people walking, the movement of carts, the installation of fixtures, etc.

To meet this strength requirement, the cover member needs to have a certain strength, and a method is known in which a steel plate thick enough to provide the cover member with a certain strength is used. However, simply adopting this method would require a large amount of steel plate material, resulting in high material costs. Furthermore, the cover member would be quite heavy, making it difficult to transport and install, and inevitably increasing construction costs. For this reason, 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 being adopted. This is because by improving structural strength, 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.

Patent documents 1 to 3 disclose the configuration of a double floor system equipped with a cover member provided with a reinforcing part that improves the above-mentioned strength.

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-like) formed on the flat plate part. The above-mentioned rib has two first ribs formed approximately parallel to each other and two second ribs extending in a direction approximately perpendicular to the first ribs and formed approximately parallel to each other, and the first ribs and the second ribs are large in shape, with the grooves continuing as the first ribs and the second ribs cross each other so as to penetrate each other (see Figures 1 and 3 of Patent Document 1, etc.). In other words, the rib (reinforcing part) of the cover member described in Patent Document 1 is large in shape with multiple ribs crossing each other and with the grooves continuing over the entire area except for the outer periphery of the upper surface of the cover member.

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

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.

JP 2008-223383 A Japanese Patent Application Publication No. 11-324288 Japanese Patent Application Publication No. 10-219981

The double floor system described in the above-mentioned "Patent Documents 1 and 2" has the problem that, although the reinforcement improves the strength, as it is used, the finishing material falls (enters) into the groove-like portion of the reinforcement provided in the cover member, forming a groove similar to that of the reinforcement on the top surface of the finishing material (hereinafter, in this application, the groove formed in this finishing material is referred to as a "remaining mark"), which deteriorates the appearance of the floor surface.

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 a groove is 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). With this reinforcing portion configuration, 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 rectangular cover member cross. This structure is known to be effective in reinforcing the cover member that is 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 for the purpose of improving strength, and the marks left by these are very noticeable. Such noticeable marks mar the aesthetic appearance of the finishing material, and are therefore not desirable in terms of appearance.

On the other hand, the double floor system described in the above-mentioned Patent Document 3 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 directly coming into contact with the groove of 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 naturally 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.

The present invention was made in consideration of the above problems, and aims to provide a double floor system that maintains its strength while making traces of finishing materials left by the reinforcing parts of the cover members less noticeable.

The first aspect of the present invention, which has been made to solve the above-mentioned problems, is a double floor system in which a floor surface is formed by spanning a plurality of supports with a cover member of an approximately plate-like body and a finishing material placed on the upper surface thereof, and the cover members are provided in multiple numbers, and the cover members are approximately rectangular or approximately cross-shaped in a plan view, and have a plurality of reinforcing parts on their base surface, which are composed of elongated grooves or elongated holes structured so that the finishing material can sink into them, and in all of the plurality of cover members having a plurality of the reinforcing parts, the multiple reinforcing parts include only those in which the multiple reinforcing parts are elongated in directions approximately parallel to and approximately perpendicular to each other and do not intersect with each other, and only the reinforcing parts that are parallel to the edges are formed at least near the edges, and the finishing material 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 elongated direction of one of the reinforcing parts.

Thus, in the first aspect of the present invention, in all of the multiple cover members having multiple reinforcing parts, the multiple reinforcing parts include only those 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. In the first aspect of the present invention, unlike the above-mentioned conventional technology (the configurations described in Patent Documents 1 and 2), the reinforcing parts are not large in size (a large configuration in which grooves are continuously formed over the entire area except for the outer peripheral edge portion of the upper surface of the cover member) or have a shape that is oblique to one side of the cover member.
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 portion 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, which maintains the strength of the cover member while making traces of the finishing material less noticeable.

Furthermore, in the configuration of the first aspect of the present invention, the reinforcing portion of the cover member is composed only of long portions in directions parallel and perpendicular to the predetermined direction of the visual pattern of the finishing material, so that the marks formed on the finishing material due to these effects can be made less noticeable, just like the seams of the finishing material.

In addition, a second 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, wherein a plurality of the cover members are provided, the cover members being approximately rectangular or approximately cross-shaped when viewed from above, and having a plurality of reinforcing sections on their base surface which are composed of elongated grooves or elongated holes structured so that the finishing material can sink into them, and in all of the plurality of cover members having a plurality of the reinforcing sections, the plurality of the reinforcing sections include only those in which the plurality of the reinforcing sections are elongated in approximately parallel and approximately perpendicular directions to each other and do not intersect with each other, and only the reinforcing sections that are parallel to the edges are formed at least near the edges, and the finishing material is approximately rectangular 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.
In addition, a third aspect of the present invention is a double floor system in which a floor surface is formed by a cover member of an approximately plate-like body being spanned between a number of supports, 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 parts on its base surface consisting of elongated grooves or elongated holes structured so that the finishing material can sink into them, the multiple reinforcing parts include only those that are elongated in approximately parallel and approximately perpendicular directions to each other and do not intersect with each other, and further, the cover member has reinforcing parts formed at least in the vicinity of its edges that are parallel to the edges, and in its central portion, the multiple reinforcing parts 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 parts.
In addition, a fourth aspect of the present invention is a double floor system in which a floor surface is formed by spanning a plurality 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 plurality 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 plurality of 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, and further, the cover member has reinforcing sections formed at least in the vicinity of its edges that are parallel to the edges, and in its central portion, the plurality of 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.

In this way, the second , third and fourth aspects of the present invention, like the first aspect described above, can make the marks formed on the finishing material placed on the cover member less noticeable compared to the above-mentioned conventional technology (the configurations described in Patent Documents 1 and 2). Also, like the first aspect described above, the second , third and fourth aspects can reduce costs compared to the invention described in Patent Document 3.

In the first, second , third and fourth aspects, it is preferable that the cover member has a protrusion, and that the protrusion is provided so as to be capable of being positioned relative to the support body.

With this configuration, even if the cover member of the double floor system is subjected to a load, the cover member remains in the optimal position, and the desired strength can be achieved without shifting out of place, providing a more stable, low-cost double floor system that leaves less noticeable marks.

The present invention makes it possible to provide a low-cost double floor system that maintains strength while making traces of finishing materials less noticeable due to the reinforcing parts of the cover members.

FIG. 1 is a schematic diagram showing the configuration of a double floor system according to a first embodiment of the present invention. 2 is a schematic diagram showing a cross section along the line AA in FIG. 1. This is a schematic diagram showing the cover member that constitutes the double floor system of the first embodiment of the present invention, viewed diagonally from above. 4 is a schematic diagram for explaining the cross section of the cover member constituting the double floor system of the first embodiment of the present invention, (a) is a schematic diagram showing the cross section along the line B-B in FIG. 3, and (b) is a schematic diagram showing the cross section along the line C-C in FIG. 3. This is a schematic diagram for explaining the arrangement and effect of the reinforcing parts of the cover members that constitute the double floor system of the first embodiment of the present invention. A schematic diagram showing a first modified example of the cover member that constitutes the double floor system of the first embodiment of the present invention. 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. 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. 8A and 8B are schematic diagrams for explaining the locking portion of a second modified example of the cover member shown in FIG. 7, in which (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. FIG. 11 is a schematic diagram showing a configuration of a second embodiment of the present invention. FIG. 13 is a schematic diagram showing a configuration of a third embodiment of the present invention.

The double floor system and the cover members that make up the double floor system according to the first to third embodiments of the present invention will be described below with reference to the drawings.

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 of the A-A arrow in FIG. 1. Also, FIG. 3 is a schematic diagram showing the cover member constituting the double floor system of the first embodiment viewed from diagonally above. Also, FIG. 4 is a schematic diagram for explaining the cross section of the cover member constituting the double floor system of the first embodiment, (a) is a schematic diagram showing the cross section of the B-B arrow shown in FIG. 3, and (b) is a schematic diagram showing the cross section of the C-C arrow shown in FIG. Also, 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.

As shown in Fig. 1, the double floor system W1 of the first embodiment is a floor base 5 on which a mat body 1 formed to a predetermined size is laid, and the wiring spaces 16 formed between the multiple supports 10 formed on the mat body 1 are connected to each other to form a single unit, forming a series of wiring spaces, and a cover member 2 (2a, 2b, 2c) is placed above this series of wiring spaces 16 to form a double floor surface. The double floor system W1 is 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.

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.

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 supports 10, and this wiring space 16 includes a passage portion formed between opposing supports 10 and an intersection portion formed where two passage portions intersect.

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 are connected to form a unified wiring space. This unified wiring space is formed in a grid shape (a lattice-like, square-like, or other grid shape) overall, so sufficient wiring capacity can be ensured.

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

The wiring space 16 formed in the mat body 1 is covered at its upper part by a cover member 2 ( 2 a , 2 b , 2 c ) 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 cushion 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.

Then, the cover members 2 (2a, 2b, 2c) are placed on the support body 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.

Furthermore, in the first embodiment, the support 10 is provided with a recessed portion (notch) 18 (see FIG. 1) that engages with an engagement portion (protrusion) 23 (see FIG. 1 and FIG. 3) provided on the cover member 2 (the engagement portion 23 will be described later). The recessed portion 18 is recessed below 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 recessed portions 18, when the cover member 2 is placed on the step portion 12 of the support body 10, the recessed portions 18 engage 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 recessed portions 18, and the effect of preventing misalignment can be easily achieved.

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.

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 member 2 (2a, 2b, 2c) is placed on this. However, the step portion 12 may be provided discontinuously, and the cover member 2 (2a, 2b, 2c) may be provided with a protrusion that engages with each step portion 12. As long as the cover member 2 (2a, 2b, 2c) can be supported by the support body 10, any suitable placement configuration may be used.

The support 10 constituting the above-mentioned mat body 1 is 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 with the cover member 2, or a double floor in which the support member has level-adjustable legs.

Next, we will explain the cover members 2 (2a, 2b, 2c) that make up the double floor system W1 of the first embodiment.

As shown in FIG. 1, the cover member 2 (2a, 2b, 2c) is formed in a substantially rectangular plate shape, one side of which is the upper surface 21 that forms a floor together with the upper surface 11 of the support 10, and the other side is the 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 portions 27 (reinforcing portions formed by groove portions) that are recessed from the upper surface 21 toward the lower surface 22. Each of the multiple reinforcing portions 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).

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 at 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 shifting vertically. The cushioning material 25 also prevents noise from being generated 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.

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 two opposing edges of a substantially rectangular shape placed 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.

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, the 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). Also, the cover member 2a is formed with locking portions 23a, 23b, 23c, and 23d at the locations where the corners of the cutouts at the four corners are formed as hypotenuses.
In addition, in order to cover (enclose) the intersection of the wiring space 16 formed in the mat body 1, the cover member 2 has a generally rectangular shape with four edges 31, 32, 33, and 34 protruding outward 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.

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.

Next, with reference to Figure 5, the arrangement of the reinforcing portion 27 of the cover member 2a will be explained in relation to the load applied to the cover member 2a.

The cover member 2a has both sides sandwiching the locking portions 23a, 23b, 23c, and 23d 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 body 10, the edges 31, 32, 33, and 34 are suspended between the above-mentioned supported portions 38, 39, 40, and 41 (i.e., when the cover member 2 is placed on the support body 10, it is supported by the four supported points 38, 39, 40, and 41, and the edges 31, 32, 33, and 34 are suspended).

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 portions 38 and 39 is in an imaginary state.
In addition, 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.
In addition, 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.
In addition, 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.

In addition, because the double floor system W1 receives loads from people walking on its top surface and from the installation of fixtures, the areas with the weakest strength are the central parts (four parts) and their vicinity of the edges 31, 32, 33, 34 of the cover member 2a in the aerial state, and the central part (one part) of the entire cover member 2, a total of five parts. For this reason, in strength tests of cover members that constitute double floor products such as double floor systems, 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.

In addition, a particularly problematic load on the cover member 2 of the double floor system W1 is the load from 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.

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.

These easily deformed parts (arcs 125-128) occur due to the positional relationship between the supported parts 38, 39, 40, 41 and the pressure point at the center of the cover member 2a, and occur even if the general shape of the cover member 2a is a polygon or circle other than a roughly rectangular shape.

In this embodiment, the reinforcing parts 27 are provided in the following positions in the five areas of the cover member 2a that are easily deformed under the influence of load, to make the marks less noticeable.

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

This configuration in which the reinforcing portion 27a is the apex and the reinforcing portions 27c and 27d are the bases, which is arranged in a generally delta shape, provides an effective reinforcing effect for the arcs 125, 126, 127, and 128, which are the weakest parts of the 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 a continuous groove, 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.

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.
Further, 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, and the traces are made less noticeable.

The reinforcing portions 27 (27a, 27b, 27c, 27d) formed in the above-mentioned delta shape can be formed, for example, by arranging them in the positions shown below.

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, one end side of the reinforcing portion 27b in the longitudinal direction is provided so as to intersect 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 other end side of the reinforcing portion 27b in the longitudinal direction is provided so as to intersect 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 so 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.

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 portion 27a and the reinforcing portion 27b are positioned at the same position in the direction along the edge 31 (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 (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 positioned 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).

Also, near the approximate center of the other edges 32, 33, 34 of the cover member 2a, multiple reinforcing parts 27a, 27b, 27c, 27d are arranged in a delta shape so as to intersect with the arcs 125-128, which are easily deformed parts, similar to the reinforcing part 27 (27a, 27b, 27c, 27d) near the approximate center of the edge 31.

The cover member 2a is also provided with reinforcing portions 27 (27e, 27f, 27g, 27h) in 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 multiple 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 .

In addition, 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 approximately parallel to or approximately perpendicular to the edges 31, 32, 33, and 34, and further, are arranged so that they do not intersect with each other.
In other words, since the cover member 2a does not have an "intersection of groove portions" as in the invention described in the above-mentioned Patent Document 1, groove portions 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.

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 designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, cover members 2b and 2c, like cover member 2a described above, are made by processing a substantially square steel plate and are formed into a substantially rectangular shape. Cover member 2c is formed to be half the size of cover member 2b.

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 longitudinal 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 substantially parallel to the longitudinal edges. The reinforcing parts 27 are arranged so as not to intersect with each other.

In this embodiment, the reinforcing portion 27 of the cover member 2 (2a, 2b, 2c) is configured as a groove, but this is not limited to this. The reinforcing portion 27 may be any structure, such as a recess or 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 in.

Next, we will explain why the configuration of the double floor system W1 of this embodiment makes marks less noticeable.

Even in the cover member 2 (2a, 2b, 2c) of the first embodiment, a groove-shaped reinforcing portion 27 is 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.
Since the traces are formed according to the groove shape of the reinforcing portion 27, all of the reinforcing portion 27 on the cover member 2 is faithfully reproduced, including the arrangement, general shape, inclination, depth, etc. of the groove. 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.

In the first embodiment of the double floor system W1, 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. The finishing materials 3 are also laid out along this grid with as little inclination as possible. Then, the joints that are the boundaries between the laid out finishing materials 3 also form a grid that is not inclined relative to the grid formed by the cover members 2 (2a, 2b, 2c).

The cover member 2a is provided on its surface 21 with reinforcing portions 27 for the purpose of reinforcement, but the length direction of all reinforcing portions 27 is perpendicular or parallel to any of the edges 31, 32, 33, 34 of the cover member a, and none of the reinforcing portions 27 is oblique to the edges 31, 32, 33, 34. Similarly, when the cover members 2b and 2c are placed on the support 10, the reinforcing portions 27 of the cover members 2b and 2c are also disposed perpendicular or parallel to any of the edges 31, 32, 33, 34 of the cover member a, and none of the reinforcing portions 27 are oblique to the edges 31, 32, 33, 34. In other words, none of the reinforcing portions 27 of the cover members 2a, 2b, 2c are oblique to the above-mentioned grid shape.
Therefore, the multiple traces 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.

If any of the multiple traces has a length direction oblique to the grid of the joints of the finishing material 3, the oblique traces will be noticeable and undesirable in the entire double floor system 1 in which the finishing material 3 is laid. This means that if the reinforcing portion 27 of the cover member 2 includes any traces 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 traces.
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.

Furthermore, in this embodiment, tile carpet is used as the finishing material 3. Tile carpet 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 is manufactured so that the grain direction is perpendicular or parallel to one side of the tile carpet.

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. In this way, 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 left diagonally 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.

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 preferable because it is expected to have the effect of suppressing the conspicuousness of the marks. 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.

<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.

The reinforcing portion 27 of the cover member 2a is preferably provided so that its width dimension (dimension Y shown in FIG. 4B) satisfies "Y≦9 mm." The reason for setting the width dimension in this manner 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 having a width dimension of 10 mm or more. In general reinforcing portions having a width dimension of 10 mm or more, the mark caused by the cover member entering the groove-shaped portion of the reinforcing portion is easily noticeable.
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.

Furthermore, in the process of product development of the cover member 2a, the inventors of the present application discovered that if the length dimension (the dimension X shown in FIG. 4(a)) of the reinforcing portion 27 of the cover member 2a is set to "X≦45 mm", compared to a reinforcing portion having approximately the length of one side of a cover member as in the conventional art (conventional art described in Patent Documents 1 and 2), the traces left behind are less noticeable, which is preferable.
In addition, 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 dimension range.

Furthermore, in the product development of the cover member 2a, the inventors of the present application confirmed that, more preferably, the width dimension of the reinforcing portion 27 of the cover member 2a is in the range of "6 mm to 7 mm", the length dimension is in the range of "20 mm to 30 mm", and the depth dimension is in the range of "1.8 mm to 2.2 mm", in order to achieve the desired strength while suppressing the leaving of marks.
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, which is a suitable design.

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 account the differences and ratios of the above dimensions.
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.
Further, 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.

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.

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 first embodiment described above are given the same reference numerals, and the description thereof will be omitted.

In the first modified example shown in the figure, the cover member 2a of the first embodiment is replaced with a cover member 2d, and the configuration other than the cover member 2d is the same as that of the first embodiment. In addition, 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.

In the first embodiment, the relationship between the weakest part and the delta-arranged reinforcing 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.

Specifically, the presser is placed in the center of the edge 31 of the cover member 2d so that it is generally included within the surface of the cover member 2d, and the presser is pressed (the circular dashed line indicated by the reference numeral 129 indicates the pressing surface of the presser). 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 of the cover member 2a.

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.

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.

In the first modified example, the reinforcing portions 27 (27a, 27i) arranged in the delta shape are provided 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.
In the cover member 2a of the first embodiment, the reinforcing portions 27 arranged in a delta shape also have the effect 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.

Second Modification of the First Embodiment
Next, a second modification of the first embodiment will be described with reference to FIG. 7 and additional figures 8.
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 arrows D-D 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.

In the second modified example shown in the figure, 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, with the rest of the configuration being the same as that 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, with the rest of the configuration being the same as that of the first embodiment.

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 integrally with the base surface of the cover member 2a at two bent portions 51b, 51b, and is provided continuously up to the top portion 51a. In addition, 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 recess (notch) 18 of the support 10 is formed in a shape that receives and engages with the locking portion 51 (protrusion).

Specifically, in the first embodiment described above, the locking portions 23 (23a, 23b, 23c, 23d) provided on the cover member 2a are formed in a semi-conical shape, so that when viewed from above, a groove having a substantially triangular shape 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. 9B, when viewed from above, a rectangular groove is formed, so that 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.

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 are given the same reference numerals, and the description thereof will be omitted.

In the second embodiment, the double floor system W2 is configured such that a plurality of support bodies 210 are connected by connecting parts 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 recessed recesses 267. The recesses 267 are adapted to receive the bent parts 220F provided at the ends of each edge of the cover member 220, and the support bodies 210 are further provided with recesses 210H, into which the reinforcing parts 227j, 227k protruding from each of the four corners of the underside of the cover member 220 are inserted and engaged. The reinforcing parts 227j, 227k contribute to positioning as well as reinforcement, so that the cover member 220 can effectively receive the supporting force from the support bodies 210 without deformation near the contact points.

In addition, the cover member 220 of the second embodiment is formed in a rectangular plate shape, and has multiple groove-shaped reinforcement portions 227 that are recessed from the top surface to the bottom surface.

Specifically, in the cover member 220, five reinforcing portions 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 portions 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 base side of the delta shape is located on the center side of the cover member 220.
The reinforcing portions 227 (227a, 227b, 227c, 227d, 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, 234.

Among the five reinforcing portions 227a, 227b, 227c, 227d, and 227e, the reinforcing portion 227b is formed so that the length dimension in the longitudinal direction is the largest, and the reinforcing portion 227d is formed so that the length dimension in the longitudinal direction is the smallest. The reinforcing portions 227c and 227e are the same size. The reinforcing portions 227c and 227e are formed so that the length dimension in the longitudinal direction is larger than that of the reinforcing portion 227a. In other words, the relationship of the length dimensions in the longitudinal direction of the five reinforcing portions 227a, 227b, 227c, 227d, and 227e is "reinforcing portion 227b > reinforcing portion 227c = reinforcing portion 227e > reinforcing portion 227a > reinforcing portion 227d."
Similarly, the length dimensions in the width direction of the five reinforcing portions 227a, 227b, 227c, 227d, and 227e have a relationship of "reinforcing portion 227a > reinforcing portion 227b > reinforcing portion 227c = reinforcing portion 227d = reinforcing portion 227e".

The cover member 220 also has reinforcing portions 227j, 227k formed at each of its four corners. The reinforcing portions 227j, 227k protrude from the underside of the cover member 220 and engage with the recessed portion 267 of the support body 210. The reinforcing portions 227j, 227k are provided across the area that overlaps with the support body 210 and the area that overlaps with the area of the cover member 210 in the aerial state, thereby increasing the strength and enabling the cover member 210 to be positioned relative to the support body 210.

In addition, reinforcing parts 227f, 227g, 227h, and 227i are provided in the center of the entire cover member 220, effectively preventing deformation of the center part of the cover member 220, which is the weakest part. Reinforcing parts 227f, 227g, 227h, and 227i are roughly formed into a rectangular shape, but when a pressing tool with a radius of 50 mm is contacted, the boundaries of the reinforcing parts 227f, 227g, 227h, and 227i intersect obliquely with each other, effectively preventing deformation.

In addition, the reinforcing portions 227a to 227k in the second embodiment are all arranged 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. In addition, the reinforcing portions 227a to 227k are arranged so that they do not intersect with each other.

In this second embodiment, as in the first embodiment, no "large marks" or "diagonal marks" are formed, and as in 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.

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 are given the same reference numerals, and the description thereof will be omitted.

The third embodiment of the double floor system W3 is configured with multiple supports 310 arranged at equal intervals and cover members 320 laid across them.

Moreover, the cover member 320 in 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 its edges 331, 332, 333, 334.

Specifically, the reinforcing portion 328a is arranged in a delta shape with the top of the edges 331, 332, 333, and 334 of the cover member 320 and the reinforcing portions 328b and 328c at the base. This configuration effectively prevents deformation of the weaker central portions of the edges 331, 332, 333, and 334 of the cover member 320.

Although the reinforcing portions 328a, 328b, and 328c are of an open type reinforcing structure, if the finishing material 3 can sink, 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.

Further, reinforcing portions 327 (327a, 327b, 327c, 327d) are provided in the center of the entire cover member 320, which effectively suppresses deformation of the center portion of the cover member 65, which is the weakest portion. The reinforcing portions 327a, 327b, 327c, 327d are generally formed in a cross shape, and when a pressing tool with a radius of 50 mm is brought into contact with the cross, the boundaries of the 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 with their longitudinal direction substantially parallel to or substantially perpendicular to one side of the cover member 320 (one of the edges 331, 332, 333, and 334).

In this way, according to the configuration of the reinforcing portions 327a, 327b, 327c, 327d, 328a, 328b, and 328c of the 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.

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 maintain strength while making traces of the finishing material 3 less noticeable due to the reinforcing parts 327, 328 of the cover member 320.

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 configurations of each embodiment, those specified by adding partial configurations of the examples described in this specification to the configurations of each embodiment, and those specified by deleting partial configurations of each embodiment.

In each of the above-mentioned embodiments, the support and the cover member are shown as separate components, but the cover member may be provided with the base surface and the support as an integrated unit, and a double floor system using this may also be used.

W1, W2, W3... Double floor system 3... Finishing material

5...Floor base

1... Mat body 1a... Base 10 (10a, 10b, 10c)... Support body 11... Upper surface 12... Step portion 16... Wiring space 18... Hollow portion

2 (2a, 2b, 2c)...Cover member 21...Upper surface 22...Lower surface 23 (23a, 23b, 23c, 23d)...Locking portion 25...Cushion material 27 (27a, 27b , 27c, 27d, 27e, 27f, 27g, 27h, 27i)...Reinforcement parts 31, 32, 33, 34...Edges 38, 39, 40, 41...Supported points (supported parts)
51: locking portion 51a: top portion 51b: bent portion 51h: hole portions 125, 126, 127, 128: arc 129: pressing surface of pressing piece 135: line (semicircular line)
137...Line (straight line)

201...connecting portion 210...support body 210H...cutout portion 220...cover member 220F...bent portion 227 (227a, 227b, 227c, 227d, 227e, 227f, 227g, 227h, 227i, 227j, 227k)...reinforcing portion 231, 232, 233, 234...edge 267...cutout portion

310... Support body 320... Cover member 327 (327a, 327b, 327c, 327d)... Reinforcing portion 328 (328a, 328b, 328c)... Reinforcing portion 331, 332, 333, 334... Edge

Claims (5)

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 reinforcing parts. 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. 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 reinforcing parts. 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. 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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