Double floor inside storage and double underfloor inspection hole

Abstract

To provide a double floor inside storage and a double underfloor inspection hole which enables inspection of the underfloor of a double floor without setting an inspection height lower than an underfloor height at the time of underfloor inspection.SOLUTION: A double floor inside storage 100 comprises: an opening / closing door 10; a first intermediate support member 20A; a container body 30; and four support legs 40. The first intermediate support member 20A includes four supports 21 positioned at the four corners of an inspection opening 4 between the outer edge and the inner edge of an outer frame 12 of the opening / closing door 10 with two sides set close to or sealed to the inner surface of the inspection opening 4. The container body 30 includes a horizontal flange 32 held between the outer frame 12 and the first intermediate support member 20A to horizontally extend. The four support legs 40 are positioned outside the four corners of a first opening 13 and positioned at the lower ends on the upper surface of a floor slab 1, and support a floor plate 2 and the first intermediate support member 20A on the respective upper ends. The first intermediate support member 20A is set such that the upper surface is sealed to the horizontal flange 32 of the container body 30 and the lower surface is positioned at a height flush with the lower surface of the floor plate 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a storage cabinet within a double floor and an inspection hatch under the double floor that allow inspection of the area under the double floor. [Background technology]

[0002] An underfloor inspection hatch for inspecting the underfloor is disclosed in Patent Document 1, for example. Furthermore, in apartment buildings, there tends to be a shortage of storage space, and underfloor storage cabinets have been proposed to ensure storage space (for example, Patent Document 2).

[0003] The "underfloor inspection hatch" in Patent Document 1 comprises an outer frame and an outer frame fixing member. The outer frame comprises a lid receiving portion connected to a rising wall along the inner periphery of the floor opening and receiving the lid, a flange connected to the upper end of the rising wall and abutting the upper floor surface around the opening, and a groove connected to the lower end of the rising wall along the length of the outer frame and into which the outer frame fixing member engages. The outer frame fixing member comprises an engaging portion that engages with the groove and a wall portion that is fixed to the joist.

[0004] The "double floor storage device" of Patent Document 2 is a storage device installed on a double floor, where floorboards are stretched at a predetermined interval on a floor base such as a concrete slab. This double floor storage device has an opening formed in the floorboards, whose four outer edges are supported horizontally from below by supports equipped with multiple height-adjustable legs, and auxiliary supports are fixed to the inner surfaces of the supports, with a receiving frame attached on top of them. Furthermore, a storage cabinet is placed below the opening in the floorboards, and the upper flange of the storage cabinet is engaged with the flange receiving parts of the receiving frame. A lid is then fitted into the opening in the floorboards, and the four peripheral edges of the lid are engaged with the lid receiving parts of the receiving frame. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-170383 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-120158 Summary of the Invention [Problem to be solved by the invention]

[0006] In apartment buildings, for example, multiple drainage pipes are installed under the double floor of a bathroom. Therefore, it is necessary to install an inspection hatch inside the double floor to inspect the area under the double floor. Double floors in condominiums and other buildings consist of a horizontally extending floor slab and floor panels whose undersides are located above the top surface of the floor slab, with a specified gap (hereinafter referred to as "underfloor height"). Multiple support columns, each with a length equivalent to the underfloor height, are provided between the floor slab and the floor panels, spaced horizontally apart to support the floor panels. The height from the top surface of the floor slab to the underside of the floorboards, i.e., the underfloor height, is, for example, about 170 to 200 mm, the thickness of the floorboards is, for example, about 20 to 40 mm, and the total height of the support bases is the same as the underfloor height.

[0007] In the case of the "underfloor inspection hatch" of Patent Document 1, joists are fixed horizontally along the underfloor surface outside the opening, and outer frame fixing members are fixed inside the joists. The total height of the joists is usually greater than the thickness of the floorboards, for example, about 30 to 60 mm. Therefore, in the case of the "underfloor inspection hatch" of Patent Document 1, there was a problem in that the distance from the top surface of the floor slab to the underside of the joists was narrower than the height under the floor because of the joists. For example, if the height under the floor was approximately 175 mm and the total height of the joists was approximately 30 to 60 mm, even when the inspection hatch was fully opened, the opening height at the bottom of the inspection hatch (hereinafter referred to as "inspection height") was only approximately 115 to 145 mm, making it extremely difficult to inspect under the floor.

[0008] In the case of the "double floor storage device" of Patent Document 2, a support material and an auxiliary support material fixed to its inner surface are required instead of the above-mentioned floor joists. The support material and auxiliary support material are positioned horizontally along the underside of the floor at the outer edge of the opening, just like the floor joists. Therefore, as with Patent Document 1, there was a problem in that the distance from the top surface of the floor slab to the bottom surfaces of the support materials and auxiliary support materials, i.e., the inspection height, was narrower than the underfloor height due to the height of the support materials and auxiliary support materials, due to the presence of support materials and auxiliary support materials.

[0009] The present invention was devised to solve the above-mentioned problems. That is, the object of the present invention is to provide a storage cabinet in a double floor and an inspection hatch under a double floor that allows inspection of the underfloor of a double floor without narrowing the "inspection height" when inspecting the underfloor compared to the "underfloor height" from the top surface of the floor slab to the underside of the floorboards. [Means for solving the problem]

[0010] According to the present invention, there is provided a storage cabinet in a double floor having a horizontally extending floor slab and a floor plate whose lower surface is located above the upper surface of the floor slab at a predetermined underfloor height. The storage cabinet is installed in a rectangular inspection opening provided in the floor plate of the double floor, an outer frame having an outer peripheral surface positioned close to or in close contact with the inner surface of the inspection opening and having a rectangular first opening on the inside, and an upper cover detachably attached to the upper part of the outer frame and capable of opening and closing the first opening; a first intermediate support member having a support portion located between the outer edge and the inner edge of the outer frame at four corners of the inspection opening, two sides of which are close to or in close contact with the inner surface of the inspection opening; a container body having a horizontal flange portion that is sandwiched between a lower surface of the outer frame and an upper surface of the first intermediate support member and extends horizontally, and that can accommodate an article below the inside of the first opening; and at least four support legs located at the four corners outside the first opening, with lower ends located on the upper surface of the floor slab, extending vertically upward, and upper ends supporting the floor panel and the first intermediate support member, respectively; A double-floor storage cabinet is provided, characterized in that the first intermediate support member has an upper surface that is in close contact with the horizontal flange portion of the container body and a lower surface that is flush with the lower surface of the floor board.

[0011] According to the present invention, there is also provided a double floor inspection hatch that is installed in a rectangular inspection opening provided in a floor plate of a double floor having a horizontally extending floor slab and a floor plate whose lower surface is located above the upper surface of the floor slab at a predetermined underfloor height, an outer frame having an outer peripheral surface positioned close to or in close contact with the inner surface of the inspection opening and having a rectangular first opening on the inside, and an upper cover detachably attached to the upper part of the outer frame and capable of opening and closing the first opening; a second intermediate support member having a support portion located between the outer edge and the inner edge of the outer frame at the four corners of the inspection opening, two sides of which are close to or in close contact with the inner surface of the inspection opening; and at least four support legs located outside the four corners of the first opening, with lower ends located on the upper surface of the floor slab, extending vertically upward, and upper ends supporting the floor plate and the second rectangular frame plate, respectively. A double underfloor inspection hatch is provided, characterized in that the upper surface of the second intermediate support member is in close contact with the lower surface of the outer frame and the lower surface is located at the same height as the lower surface of the floor board. [Effects of the Invention]

[0012] According to the configuration of the double-floor storage cabinet of the present invention, the upper surface of the first intermediate support member is in close contact with the horizontal flange portion of the container body, and its lower surface is located at the same height as the lower surface of the floor board, so that the floor board and the first intermediate support member can each be supported at the same height by at least four support legs.

[0013] In addition, the four support legs are located on the outside of the four corners of the first opening and support the floor board and the first intermediate support member at their upper ends, respectively, thereby supporting the opening and closing door via the first intermediate support member and the horizontal flange portion and supporting the outside of the four corners of the inspection opening in the floor board.

[0014] Furthermore, with this configuration, the shape of the inspection hatch in four horizontal directions formed between the four support legs is rectangular, with its upper end at the same height as the underside of the floorboards and its lower end at the same height as the top surface of the floor slab.With this configuration, when the opening and closing door and container body are removed, the inspection height in four horizontal directions matches the underfloor height from the top surface of the double floor floor slab to the underfloor height of the floorboards. Therefore, it is possible to inspect the underside of a double floor in an apartment building or the like without narrowing the inspection height from the top surface of the floor slab to the underside of the floorboards below the underfloor height.

[0015] In addition, the double-floor under-floor inspection hatch of the present invention is a structure in which the container body is omitted from the configuration of the double-floor storage cabinet and the first intermediate support member is replaced with a second intermediate support member, and has essentially the same effect as the double-floor storage cabinet. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an explanatory diagram of a first embodiment of a double-floor storage cabinet according to the present invention. [Figure 2] FIG. 1B is an enlarged view of part C in FIG. [Figure 3] FIG. 4 is an explanatory view of a first intermediate support member. [Figure 4] 10 is an explanatory diagram of a first intermediate support member in a second embodiment of a storage cabinet with a double floor according to the present invention. FIG. [Figure 5] FIG. 1 is an explanatory diagram of a double underfloor inspection hatch according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In addition, common parts in the drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0018] 1 is an explanatory diagram of a first embodiment of a double-floor storage cabinet 100 according to the present invention. In this figure, (A) is a plan view of a room equipped with the double-floor storage cabinet 100, and (B) is a cross-sectional view taken along line BB in (A). A room equipped with the double-floor storage cabinet 100 is, for example, a washroom in an apartment building or the like.

[0019] The double floor storage shed 100 of the present invention is installed in a rectangular inspection opening 4 provided in the floor panel 2 of a double floor 3 having a horizontally extending floor slab 1 and a floor panel 2 whose underside is located above the upper surface of the floor slab 1 at a predetermined underfloor height H. The floor slab 1 is preferably located at the boundary with the floor below, but may also be located on a floor with no lower floor (for example, the first floor). Piping and equipment such as horizontal drainage pipes (not shown) are installed on the floor slab below the double floor 3. The inspection opening 4 is a rectangular opening provided in the floorboard 2, and is set to a size necessary for inspecting and repairing the piping and equipment under the floor. The size of the inspection opening 4 in a plan view is, for example, a square of 455 mm x 455 mm, but is not limited to this example and may be a larger square or rectangle.

[0020] FIG. 2 is an enlarged view of part C in FIG. 1(B). In this example, the floor board 2 is made up of, from the bottom, a floor panel 2a, an intermediate board 2b, and a cushion floor 2c, all of which are tightly attached to one another. The intermediate board 2b is, for example, plywood. The thickness of each panel is, for example, approximately 20 mm for the floor panel 2a, approximately 12 mm for the intermediate panel 2b, and approximately 1.8 mm for the cushion flooring 2c, with the total height of the floor panel 2 being approximately 35 mm. Note that these thicknesses are just an example, and it is sufficient if the rigidity is such that there is little deflection when people living in the room walk on them and they do not feel uncomfortable.

[0021] 1 and 2, the double-floor storage cabinet 100 includes an opening / closing door 10, a first intermediate support member 20A, a container body 30, and at least four support legs 40.

[0022] In this example, the door 10 comprises an outer frame 12 and a top cover 14 .

[0023] The outer frame 12 has an outer peripheral surface 12a positioned close to or in close contact with the inner surface of the inspection opening 4, and has a rectangular first opening 13 on the inside. The upper end of the outer peripheral surface 12a of the outer frame 12 is positioned at substantially the same height as the upper surface of the floor panel 2. The size of the first opening 13 is, for example, a square of 410 mm x 410 mm. The first opening 13 is an upper opening for loading and unloading luggage into the container body 30, and functions as an underfloor inspection hatch when the container body 30 is removed for underfloor inspection.

[0024] In this example, the outer frame 12 further has a horizontal lower surface 12c and an upper cover receiving portion 12d. The horizontal lower surface 12c extends horizontally inward from the lower end of the outer peripheral surface 12a and is in close contact with the upper surface of the horizontal flange portion 32. The top cover accommodating portion 12d accommodates the top cover 14 therein.

[0025] In FIG. 2, the outer frame 12 further has an upper protruding portion 12b. The upper protrusion 12b extends outward from the upper end of the outer peripheral surface 12a along the upper surface of the floor panel 2 to the outside of the inner edge of the inspection opening 4. The upper protruding portion 12b is not essential and may be omitted.

[0026] In FIG. 2, the top cover 14 is detachably attached to the top of the outer frame 12 and is configured to be able to open and close the first opening 13. When the first opening 13 is fully closed by the top lid 14, the top lid 14 is accommodated inside the top lid accommodating portion 12d, and its upper surface is positioned at substantially the same height as the upper surface of the outer frame 12.

[0027] In this example, the top cover 14 is made up of an inner frame 14a that is directly housed inside the top cover housing portion 12d, and a top cover plate 14b that is fixed to the inside of the inner frame 14a. The upper cover plate 14b has a rigidity that allows it to bend little when people living in the room walk, without causing discomfort, while its outer periphery is supported by the inner frame 14a. A weight scale or the like may be built into the upper cover plate 14b. The inner frame 14a has a handle inside the frame, allowing the top cover 14 to be easily removed from the outer frame 12. The handle is, for example, a semi-rotating type, and is stored inside the frame when not in use so that it does not protrude upward.

[0028] 3A and 3B are explanatory diagrams of the first intermediate support member 20A, where (A) is a plan view and (B) is a cross-sectional view taken along line BB in (A).

[0029] 3(A), the first intermediate support member 20A has, in a plan view, four support portions 21. The four support portions 21 are located at the four corners of the inspection opening 4 between the outer edge and the inner edge of the outer frame 12, and each of the four support portions 21 has two sides 21a, 21b that are close to or in close contact with the inner surface of the inspection opening 4.

[0030] In this example, the four support parts 21 are integrated into a frame-shaped flat plate, with the outer surface 22a located close to or in close contact with the inspection opening 4, and the inner surface 22b located close to and outside the first opening 13. That is, the first intermediate support member 20A is a frame-shaped plate material when viewed in a plane, and is located between the outer edge (outer peripheral surface 12a) and inner edge of the outer frame 12, with the outer peripheral surface close to or in close contact with the inspection opening 4, and the inner peripheral surface is located outside the first opening 13. The outer peripheral surface 22 a has substantially the same shape and size as the inspection opening 4 , and the inner peripheral surface 22 b is larger than the first opening 13 and is positioned outside the outer surface of the container body 30 . It is preferable that the first intermediate support member 20A is integral as a whole, but it may be separable.

[0031] It is preferable that the first intermediate support member 20A has the same thickness as a whole, including the four support portions 21. However, this configuration is not essential, and the upper surfaces 24a of the four support portions 21 may be in close contact with the lower surface of the horizontal flange portion 32, the lower surfaces 24b may be in close contact with the upper surface of the support plate 44, and the portions other than the four support portions may be thinner than the support portions 21.

[0032] As shown in Figure 3(B), the cross-sectional shape of the frame portion of the first intermediate support member 20A is preferably the same rectangular shape throughout, with the upper surface 24a being in close contact with the lower surface of the horizontal flange portion 32 and the lower surface 24b being in close contact with the upper surface of the support plate 44. As shown in FIG. 3(B), the material of the first intermediate support member 20A is preferably wood (for example, plywood) B1, square metal pipe B2, or elastic material (for example, elastic rubber) B3. Furthermore, like the elastic member B4, protrusions (for example, cylindrical portions) of the same height may be provided on the upper surface 24a or the lower surface 24b to absorb vertical vibrations acting on the first intermediate support member 20A.

[0033] 1 and 2, the container body 30 is a container that is open at the top and is configured to be able to store articles below the inside of the first opening 13. The container body 30 has a horizontal flange 32 that extends horizontally and is sandwiched between the horizontal lower surface 12c of the outer frame 12 of the opening / closing door 10 and the upper surface of the first intermediate support member 20A. The horizontal flange 32 has a rectangular frame shape with a rectangular inner edge located inside the first opening 13 and a rectangular outer edge located inside the inspection opening 4. The shape of the horizontal flange 32 is preferably substantially the same as that of the first intermediate support member 20A shown in Figure 3(A).

[0034] The container body 30 further has four side plates 34 and a bottom plate 36 . The four side plates 34 extend vertically or diagonally inward from the inner edge of the horizontal flange 32 downward. The bottom plate 36 has its outer edges fixed to the lower ends of the four side plates 34 and extends horizontally. The horizontal flange 32, side plates 34, and bottom plate 36 are preferably made of the same material (metal or plastic) and are joined together at joints. While the joining is preferably by integral molding, it may also be by welding or fusion bonding.

[0035] In FIG. 1, the container body 30 further has an air hole 38 in the side plate 34 that allows air to circulate between the inside and outside. The air holes 38 are preferably provided on two opposing surfaces of the four side plates 34, but may be provided on three or four surfaces. This configuration makes it possible to prevent condensation inside the container body 30.

[0036] In FIGS. 1 and 2, the bottom plate 36 is positioned in close contact with the upper surface of the floor slab 1. With this configuration, the support force for supporting the outer frame 12 can be increased by the rigidity of the container body 30 in the vertical direction. The bottom plate 36 may be positioned adjacent to the upper surface of the floor slab 1 with a gap therebetween.

[0037] In this example, there are four support legs 40, which are located outside the four corners of the first opening 13, with their lower ends located on the upper surface of the floor slab 1 and extending vertically upward, and their upper ends supporting the floor panel 2 and the first intermediate support member 20A. The number of support legs 40 is not limited to four, and may be five or more. For example, if the inspection opening 4 has a square or rectangle shape with a long side in plan view and is subject to significant bending when people living in the room walk, additional support legs 40 may be added to the middle of the four corners of the first opening 13. The additional support legs 40 should preferably be provided on the outside of the first opening 13.

[0038] In FIG. 2, each support leg 40 has a length adjustment mechanism 42 , a support plate 44 , and an elastic support member 46 .

[0039] In this example, the length adjustment mechanism 42 consists of a rod-shaped member 42a having a male threaded portion 41 at its upper end and a nut member 42b having a female threaded portion that screws into the male threaded portion 41, and is configured to be able to adjust the overall length of the support base 40 to the same length as the underfloor height H while maintaining rigidity. For example, when the height H below the floor is about 175 mm, the adjustment range of the overall length of the support leg 40 is preferably about 140 mm to about 200 mm.

[0040] The support plate 44 has a size that allows it to support the floor panel 2 and the first intermediate support member 20A on the same upper surface, and the upper end surface supports the four corners of the floor panel 2 and the first intermediate support member 20A at the same height. The support plate 44 is, for example, a flat plate measuring 88 mm x 88 mm. 1(A), some of the four corners of the support plate 44 support the four corners of the first intermediate support member 20A, and the remaining majority of the support plate 44 supports the floor board 2. In addition, the support position of the first intermediate support member 20A is away from the center position of the support leg 40. Therefore, it is preferable to fix the upper surface of the support plate 44 to the lower surface of the floor board 2 so that the position of the support leg 40 does not change.

[0041] In this example, the elastic support member 46 is a vibration-isolating member (vibration-isolating rubber) fixed to the lower end of the rod-shaped member 42a, and absorbs vibrations in the length direction of the support leg 40. This configuration ensures vibration-proofing properties.

[0042] The first intermediate support member 20A is set so that its upper surface is in close contact with the horizontal flange 32 of the container body 30 and its lower surface is flush with the lower surface of the floor plate 2. In other words, the sum of the height from the upper surface of the floorboard 2 to the horizontal lower surface 12c of the outer frame 12, the thickness of the horizontal flange portion 32, and the thickness of the first intermediate support member 20A is the same as the thickness of the floorboard 2.

[0043] 4A and 4B are explanatory diagrams of a first intermediate support member 20A in a second embodiment of a double-floor storage cabinet 100 according to the present invention, where (A) is a plan view and (B) is a cross-sectional view taken along line BB in (A). The second embodiment of the double-floor storage cabinet 100 differs from the first embodiment only in the first intermediate support member 20A, and the other configurations are the same.

[0044] 4, the support portions 21 of the first intermediate support member 20A are four L-shaped flat plates, each having the above-mentioned two sides 21a, 21b and the opposing sides 26a, 26b. Note that the support portions 21 may also be rectangular flat plates. In addition, in this example, the four support parts 21 are separated, and each outer surface 22a (i.e., two sides 21a, 21b) is located close to or in close contact with the inspection opening 4, and the inner surface 22b is located close to and outside the first opening 13. Furthermore, it is preferable that the four support portions 21 are fixed in advance to the upper surfaces of the support plates 44 of the four support legs 40 located on the outer sides of the four corners of the first opening 13, respectively. This configuration allows the four support parts 21 and the four support legs 40 to be accurately positioned in accordance with the four corners of the inspection opening 4.

[0045] According to the configuration of the double-floor storage cabinet 100 described above, the upper surface of the first intermediate support member 20A is in close contact with the horizontal flange 32 of the container body 30, and the lower surface is located at the same height as the lower surface of the floor plate 2. With this configuration, the floor plate 2 and the first intermediate support member 20A can be supported at the same height H by at least four support legs 40.

[0046] In addition, the four support legs 40 are located outside the four corners of the first opening 13 and support the floor board 2 and the first intermediate support member 20A at their upper ends, respectively, thereby supporting the opening and closing door 10 via the first intermediate support member 20A and the horizontal flange portion 32, and at the same time supporting the outside four corners of the inspection opening 4 in the floor board 2.

[0047] Furthermore, with this configuration, the shape of the inspection hatch in four horizontal directions formed between the four support legs 40 is rectangular, with its upper end at the same height as the underside of the floorboards and its lower end at the same height as the top surface of the floor slab 1. With this configuration, when the opening and closing door 10 and the container body 30 are removed, the inspection height in four horizontal directions matches the underfloor height H from the top surface of the floor slab of the double floor to the underside of the floorboards. Therefore, it is possible to inspect the underfloor of the double floor 3 in an apartment building or the like without narrowing the inspection height from the top surface of the floor slab 1 of the double floor 3 to the underside of the floorboards below the underfloor height H.

[0048] FIG. 5 is an explanatory diagram of a double floor inspection hatch 90 according to the present invention, and is an enlarged view similar to FIG. In this figure, the double floor under-floor inspection hatch 90 is installed in a rectangular inspection opening 4 provided in the floorboard 2 of the double floor 3, similar to the above-mentioned double floor storage shed 100. In FIG. 5, the double underfloor inspection hatch 90 includes an opening / closing door 10, a second intermediate support member 20B, and a plurality of support legs 40. The opening and closing door 10 and the plurality of support legs 40 are the same as those of the double-floor storage cabinet 100 described above.

[0049] In FIG. 5, the above-described container body 30 is not provided, and a second intermediate support member 20B is provided instead of the first intermediate support member 20A. In this example, the upper surface of the second intermediate support member 20B is in close contact with the lower surface of the outer frame 12, and the lower surface of the second intermediate support member 20B is located at the same height as the lower surface of the floor board 2. That is, the second intermediate support member 20B has the same shape as the first intermediate support member 20A of the first or second embodiment of the double-floor storage cabinet 100 described above, and differs only in thickness. The thickness of the second intermediate support member 20B is the sum of the thickness of the first intermediate support member 20A and the thickness of the horizontal flange portion 32 of the container body 30 described above. The second intermediate support member 20B may be made of a thin plate having a thickness equivalent to that of the first intermediate support member 20A and the horizontal flange portion 32. The other configurations are the same as those of the double-floor storage shed 100 described above.

[0050] The above-mentioned double-floor under-floor inspection hatch 90 of the present invention is a configuration in which the container body 30 is omitted from the configuration of the double-floor storage cabinet 100 and the first intermediate support member 20A is replaced with a second intermediate support member 20B, and has substantially the same effect as the double-floor storage cabinet. In other words, the upper surface of the second intermediate support member 20B is in close contact with the lower surface of the outer frame 12, and the lower surface of the second intermediate support member 20B is located at the same height as the lower surface of the floor board 2, so that the floor board 2 and the second intermediate support member 20B are each supported at the same height H by at least four support legs 40.

[0051] In addition, the four support legs 40 are located outside the four corners of the first opening 13 and support the floor board 2 and the second intermediate support member 20B at their upper ends, respectively, thereby supporting the opening and closing door 10 via the second intermediate support member 20B and supporting the outside four corners of the inspection opening 4 in the floor board 2.

[0052] Furthermore, with this configuration, the shape of the inspection hatch in four horizontal directions formed between the four support legs 40 is rectangular, with the upper end at the same height as the underside of the floorboards and the lower end at the same height as the upper surface of the floor slab 1. Therefore, when the upper cover plate 14b is fully opened, the inspection height in the four horizontal directions matches the underfloor height H from the upper surface of the floor slab 1 of the double floor to the underside of the floorboards. Therefore, it is possible to inspect the underfloor of the double floor 3 in an apartment building or the like without narrowing the inspection height from the top surface of the floor slab 1 of the double floor 3 to the underside of the floorboards below the underfloor height H.

[0053] The scope of the present invention is not limited to the above-described embodiments, but is indicated by the claims, and further includes all modifications within the meaning and scope equivalent to the claims. [Explanation of symbols]

[0054] H underfloor height, 1 floor slab, 2 floor board, 2a floor panel, 2b intermediate board, 2c cushion flooring, 3 double floor, 4 inspection opening, 10 opening and closing door, 12 outer frame, 12a outer peripheral surface, 12b upper protrusion, 12c horizontal lower surface, 12d upper lid storage section, 13 first opening, 14 upper lid, 14a inner frame, 14b upper lid plate, 20A first intermediate support member, 20B second intermediate support member, 21 support section, 21a, 21b two sides, 22a outer peripheral surface, 22b inner peripheral surface, 24a upper surface, 24b lower surface, 26a, 26b opposing sides, 30 container body, 32 horizontal flange, 34 side plate, 36 bottom plate, 38 air hole, 40 support base, 41 male thread section, 42 Length adjustment mechanism, 42a rod-shaped member, 42b nut member, 44 support plate, 46 elastic support member, 90 double floor under-floor inspection hatch, 100 double floor storage compartment

Claims

1. A storage cabinet in a double floor is installed in a rectangular inspection opening provided in the floor board of a double floor having a horizontally extending floor slab and a floor board whose lower surface is located above the upper surface of the floor slab at a predetermined underfloor height, an outer frame having an outer peripheral surface positioned close to or in close contact with the inner surface of the inspection opening and having a rectangular first opening on the inside, and an upper cover detachably attached to an upper portion of the outer frame and capable of opening and closing the first opening; a first intermediate support member having a support portion located between the outer edge and the inner edge of the outer frame at four corners of the inspection opening, two sides of which are close to or in close contact with the inner surface of the inspection opening; a container body having a horizontal flange that is sandwiched between a lower surface of the outer frame and an upper surface of the first intermediate support member and that extends horizontally, and that is capable of accommodating an article below the inside of the first opening; and at least four support legs located at the four corners outside the first opening, with lower ends located on the upper surface of the floor slab, extending vertically upward, and upper ends supporting the floor panel and the first intermediate support member, respectively. A double-floor storage cabinet characterized in that the first intermediate support member has an upper surface that is in close contact with the horizontal flange portion of the container body and a lower surface that is flush with the lower surface of the floor board.

2. The double-floor storage cabinet described in claim 1, wherein the first intermediate support member is a frame-shaped flat plate whose outer surface is located close to or in close contact with the inspection opening and whose inner surface is located close to and outside the first opening.

3. 2. The double-floor storage cabinet according to claim 1, wherein the support portion is four rectangular or L-shaped flat plates having the two sides and opposing sides opposite the two sides.

4. The upper end of the outer peripheral surface of the outer frame is located at substantially the same height as the upper surface of the floor board, The outer frame further includes a horizontal lower surface that extends horizontally from a lower end of the outer peripheral surface and is in close contact with an upper surface of the horizontal flange portion, and an upper lid accommodating portion that accommodates the upper lid therein, A double-floor storage cabinet as described in claim 1, wherein when the first opening is fully closed, the upper lid is stored inside the upper lid storage section and its upper surface is positioned at substantially the same height as the upper surface of the outer frame.

5. The double-floor storage cabinet according to claim 4, wherein the outer frame has an upper protrusion extending outward from the upper end of the outer peripheral surface to a position outside the inner edge of the inspection opening.

6. A double-floor storage cabinet as described in claim 4, wherein the sum of the height from the upper surface of the floor plate to the horizontal lower surface of the outer frame, the thickness of the horizontal flange portion, and the thickness of the first intermediate support member is the same as the thickness of the floor plate.

7. the horizontal flange has a rectangular frame shape having a rectangular inner edge located inside the first opening and a rectangular outer edge located close to and inside the inspection opening, The container body further comprises: four side plates extending vertically or diagonally inward downward from the inner edge of the horizontal flange; a bottom plate having an outer edge fixed to the lower end of the side plate and extending horizontally; The double-floor storage cabinet according to claim 1 , wherein the horizontal flange, the side panels, and the bottom panel are integrated with each other at joints.

8. The double-floor storage cabinet according to claim 7, wherein the bottom plate is located close to or in close contact with the upper surface of the floor slab.

9. The double-floor storage cabinet according to claim 7, wherein the container body has air holes in the side panels that allow air to circulate between the inside and outside.

10. The support leg has a length adjustment mechanism that can adjust the overall length to the same length as the underfloor height; a support plate that supports the floor plate and the first intermediate support member at the same height on its upper end surface; 2. The double-floor storage cabinet according to claim 1, further comprising an elastic support member for absorbing vibrations in the longitudinal direction.

11. A double floor inspection hatch to be installed in a rectangular inspection opening provided in the floor board of a double floor having a horizontally extending floor slab and a floor board whose lower surface is located above the upper surface of the floor slab at a predetermined underfloor height, an outer frame having an outer peripheral surface positioned close to or in close contact with the inner surface of the inspection opening and having a rectangular first opening on the inside, and an upper cover detachably attached to an upper portion of the outer frame and capable of opening and closing the first opening; a second intermediate support member having a support portion located between the outer edge and the inner edge of the outer frame at four corners of the inspection opening, two sides of which are close to or in close contact with the inner surface of the inspection opening; and at least four support legs located at the four corners outside the first opening, with lower ends located on the upper surface of the floor slab, extending vertically upward, and upper ends supporting the floor panel and the second intermediate support member, respectively. A double underfloor inspection hatch characterized in that the second intermediate support member has an upper surface that is in close contact with the lower surface of the outer frame and a lower surface that is flush with the lower surface of the floor board.

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