Inspection hatch frame structure, frame member for inspection hatch frame structure, and wall / ceiling structure having an inspection hatch

Abstract

To provide an inspection opening frame structure that can be installed in an inspection opening T1 made in a wall material P or ceiling material without fixing the frame 1 to the base material or base frame of the wall material P or ceiling material, and a frame member for this inspection opening frame structure. Also to provide a wall / ceiling structure 100 having an inspection opening that can be constructed even without a base material or base frame on the back side of the wall material P or ceiling material. [Solution] An inspection opening frame structure comprising a frame body 1 provided on the periphery of an inspection opening T1 opened in a wall material P or ceiling material that separates an indoor S1 and an outdoor S2, and a lid body 2 that is detachably provided to close the frame opening T2 of the frame body 1, and a wall / ceiling structure having an inspection opening, wherein the frame body 1 has a mounting base 3 on which a mounting surface 31 is formed to be fixed to the indoor S1 side surface of the wall material P or ceiling material.

Description

Technical Field

[0001] The present invention relates to an inspection port frame structure provided in an inspection port opened in a wall material or ceiling material of a building, a frame member used for this inspection port frame structure, and a wall / ceiling structure having an inspection port.

Background Art

[0002] As an inspection port frame structure provided in an inspection port for inspecting piping and the like arranged inside a wall or ceiling of a building, conventionally, an inspection port frame structure including a frame body provided at the periphery of the inspection port and a lid body detachably provided so as to close the frame opening of this frame body is known (for example, Patent Documents 1, 2 below, etc.).

[0003] Currently, it is mainstream to use plasterboard for the wall materials and ceiling materials of buildings, and screws and nails do not work on this plasterboard itself. Therefore, the conventional inspection port frame structure cannot be attached unless there is a base material (for example, studs, horizontal rails, edge strips, etc.) on the back side of the wall material or ceiling material where screws and the like work, and there is a drawback that the opening position of the inspection port is restricted, and there is also a drawback that a base frame along the periphery of the inspection port has to be newly attached to the back side of the wall material or ceiling material.

[0004] Also, for example, in a so-called trailer house placed on the loading platform of a vehicle, there are often no suitable base materials on the back side of the wall materials in the living room, and moreover, there are cases where a new base frame cannot be attached to the back side of the wall materials, making it difficult to provide the conventional inspection port frame structure.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] This invention was made in view of the above-mentioned drawbacks of conventional inspection hatch frame structures, and aims to provide an inspection hatch frame structure that can be installed in an inspection hatch without fixing the frame to the base material or base frame of the wall or ceiling material. It also aims to provide a frame member to be used in this inspection hatch frame structure. Furthermore, it aims to provide a wall / ceiling structure with an inspection hatch that can be constructed even if there is no base material or base frame on the back of the wall or ceiling material. [Means for solving the problem]

[0007] The present invention relates to an inspection opening frame structure provided in an inspection opening made in a wall or ceiling material that separates the interior from the exterior, The inspection opening comprises a frame provided around its periphery and a lid that is detachably provided to close the frame opening of the frame, The frame has a mounting base formed on which a mounting surface is fixed to the interior side surface of the wall material or the ceiling material, and is constructed by framing a plurality of frame members that extend along each side of the periphery of the inspection opening. The frame member, An extension portion extending from the end of the mounting base on the inspection port side toward the exterior side, A support portion extends from the outer end of the extension toward the inspection opening and supports the outer surface of the cover that closes the frame opening, A side wall portion extending inward from the end of the mounting base opposite to the inspection opening side, A pressing portion is provided at the interior end of the side wall portion so as to be foldable, and presses against the interior surface of the lid that closes the frame opening, A first engaging portion is provided at the end of the mounting base on the inspection port side, A second engaging portion is provided on the pressing portion and detachably engages with the first engaging portion, Equipped with, The mounting base is characterized in that a fixing groove is formed between the interior side wall portion and the first engagement portion of the mounting base, for housing a fixing member for fixing the mounting base to the wall material or the ceiling material.

[0008] Furthermore, the present invention is characterized in that the mounting surface is formed on the entire outdoor-facing surface of the mounting base.

[0009] Furthermore, the present invention is A base connecting groove is formed at the bottom of the fixing groove, housing a connecting member for connecting the ends of each frame member along the corners of the periphery of the inspection opening. It is characterized by the following. [Effects of the Invention]

[0013] According to the inspection hatch frame structure and frame member for the inspection hatch frame structure of the present invention, the frame body has a mounting base formed with a mounting surface that is fixed to the interior side surface of a wall material or ceiling material, so the frame body can be directly fixed to the wall material or ceiling material around the periphery of the inspection hatch. Therefore, unlike conventional inspection hatch frame structures in which the frame body was fixed to the base material of the wall material, the position of the inspection hatch is not restricted, and there is no need to newly attach a base frame along the periphery of the inspection hatch to the back side of the wall material or ceiling material, and it can be easily installed in an inspection hatch opened in a wall material or ceiling material.

[0014] Furthermore, according to the wall and ceiling structure with an inspection opening according to the present invention, the wall or ceiling material is made of wood, and the frame has a mounting base formed on the interior side surface of the wall or ceiling material, and since this frame is fixed to the wall or ceiling material from the interior side, the wall and ceiling structure with an inspection opening can be constructed even if there is no base material or base frame on the back side of the wall or ceiling material. [Brief explanation of the drawing]

[0015] [Figure 1] This is a front view of the inspection hatch frame structure and the wall structure having an inspection hatch according to this embodiment. [Figure 2] This is a rear view of the inspection hatch frame structure and the wall structure having an inspection hatch according to this embodiment. [Figure 3] This is an enlarged cross-sectional view taken along the line AA in Figure 1. [Figure 4] This is an enlarged cross-sectional view taken along the line BB in Figure 1. [Figure 5] This is a perspective view of the frame member and connecting member used in the inspection hatch frame structure and the wall structure having an inspection hatch according to this embodiment. [Figure 6] This is an enlarged cross-sectional view of the main part for explaining the construction process of the inspection port frame structure and the wall structure having the inspection port according to the present embodiment. [Figure 7] This is an enlarged cross-sectional view of the main part of the inspection port frame structure and the wall structure having the inspection port according to another embodiment of the present invention.

Embodiments for Carrying out the Invention

[0016] As shown in FIGS. 1 to 4, the inspection port frame structure 10 of the present embodiment includes a frame body 1 provided at the periphery of a square inspection port T1 formed in a wall material P that partitions the interior S1 and the exterior S2 of a building, and a square plate-shaped lid body 2 detachably provided so as to close the frame opening T2 of the frame body 1. And the wall structure 100 having the inspection port of the present embodiment is composed of these wall material P, the frame body 1, and the lid body 2.

[0017] The wall material P of the present embodiment is composed of a wooden plywood. The constituent material of this wall material P is not particularly limited, and for example, other wooden materials such as wood and medium density fiberboard (MDF), as well as plasterboard and the like can be adopted.

[0018] As shown in FIGS. 1 and 2, the frame body 1 is composed of a total of four frame members 11·11... extending along each side of the opening periphery of the inspection port T1, and two types of substantially L-shaped connecting members 12·13 of different sizes that connect the ends of each frame member 11 along each corner of the opening periphery of the inspection port T1, and is fixed to the wall material P at the periphery of the inspection port T1 by a plurality of screws 14 of the fixing member.

[0019] Each frame member 11 is formed into an isosceles trapezoid shape in a front view by cutting a long extrusion molding (see FIG. 5(a)) to a predetermined length according to each side of the inspection port T1 and cutting off both ends thereof at an angle of 45 degrees. Then, the cut-off inclined surfaces of each frame member 11 are abutted against each other, and the wing pieces 121·131 of the connecting members 12, 13 (see FIGS. 5(b)(c)) are welded to the ends of each frame member 11 respectively, thereby forming a square frame body 1.

[0020] The frame member 11 and connecting members 12 and 13 are made of a rigid material having sufficient strength to support the lid 2. For example, rigid polyvinyl chloride resin, ABS resin, polystyrene resin, polyethylene resin, polypropylene resin, aluminum, or aluminum alloy can be used. The frame member 11 and connecting members 12 and 13 may be bonded to each other with an adhesive. The constituent material of the lid 2 is not particularly limited, but for example, the same material as the wall material P, such as wood plywood or plasterboard, can be used. The constituent material of the lid 2 may be different from the wall material P.

[0021] As shown in Figure 4, the frame member 11 of this embodiment consists of a mounting base 3 fixed to the interior S1 side surface of the wall material P, an extension 4 extending from the inspection opening T1 side end of the mounting base 3 toward the exterior S2 side, a support 5 extending from the exterior S2 side end of the extension 4 toward the inspection opening T1 side, a side wall 6 extending from the opposite end of the mounting base 3 toward the interior S1 side, a retaining portion 7 provided to be foldable at the interior S1 side end of the side wall 6, a first engaging portion 8 provided at the inspection opening T1 side end of the mounting base 3, and a second engaging portion 9 provided on the retaining portion 7 that detachably engages with the first engaging portion 8.

[0022] The mounting base 3 is formed over the entire longitudinal direction of the frame member 11, and a mounting surface 31 is formed on its exterior S2 side surface, which is fixed to the interior S1 side surface of the wall material P. In this embodiment, the mounting surface 31 is formed over the entire exterior S2 side surface of the mounting base 3, from the end on the inspection opening T1 side to the end on the opposite side of the inspection opening T1.

[0023] The extension portion 4 is integrally formed with the mounting base portion 3 at a right angle to the entire longitudinal direction of the frame member 11. Note that the side of the extension portion 4 opposite to the inspection opening T1 does not necessarily have to contact the end face of the wall material P on the inspection opening T1 side; there may be a gap between the extension portion 4 and the end face of the wall material P.

[0024] The support portion 5 is integrally formed with the extension portion 4 at a right angle to the entire longitudinal direction of the frame member 11, and supports the exterior S2 side of the lid 2 that closes the frame opening T2. In this embodiment, the support portion 5 has a support portion connecting groove 51 formed on its interior S1 side for housing the connecting member 13 that connects the ends of each frame member 11, and the support portion 5 and the connecting member 13 are welded together with the wing pieces of the connecting member 13 housed in this support portion connecting groove 51.

[0025] The side wall portion 6 is integrally formed with the mounting base portion 3 so as to be perpendicular to the entire longitudinal direction of the frame member 11.

[0026] The retaining portion 7 is integrally formed on the end of the side wall portion 6 on the interior S1 side, extending along the entire longitudinal direction of the frame member 11, and is foldable. When the retaining portion 7 is folded down, its tip portion 73 presses against the interior S1 side surface of the lid 2 that closes the frame opening T2. The retaining portion 7 in this embodiment consists of an integral hinge 71 made of a soft material integrally formed on the end of the side wall portion 6 by known two-color extrusion molding, and a folding piece 72 made of the same hard material as the side wall portion 6, formed on the tip side of the integral hinge 71. For example, a soft polyvinyl chloride resin or thermoplastic elastomer can be used as the soft material constituting the integral hinge 71. In addition, the tip portion 73 of the folding piece 72 has an insertion recess 731 into which the tip of a tool such as a flathead screwdriver can be inserted when the retaining portion 7 is raised.

[0027] The first engagement portion 8 is integrally formed with the mounting base portion 3 at a right angle to the entire longitudinal direction of the frame member 11. The first engagement portion 8 in this embodiment consists of an inner wall 81 formed on the inspection opening T1 side, an outer wall 82 formed opposite to the inner wall 81, and an engagement groove 83 formed between the inner wall 81 and the outer wall 82 and open to the room S1 side. As shown in Figure 5(a), an inclined projection 811 is formed on the engagement groove 83 side of the open end of the inner wall 81, inclined towards the room S1 side, and an inclined projection 821 is formed on the engagement groove 83 side of the open end of the outer wall 82, inclined towards the outside S2 side, and the groove width of the engagement groove 83 is increased towards the back of the groove.

[0028] The second engaging portion 9 is integrally formed with the frame member 11 over its entire longitudinal direction, perpendicular to the tilting piece 72 of the pressing portion 7, and as shown in Figure 4, engages with the first engaging portion 8 when the pressing portion 7 is tilted down. As shown in Figure 5(a), the second engaging portion 9 of this embodiment consists of a head portion 91 with a substantially circular cross-section and a neck portion 92 which is thinner than the head portion 91. By engaging the head portion 91 of the second engaging portion 9 with the back of the engagement groove 83 of the first engaging portion 8, the tilted state of the pressing portion 7 is stably maintained, and the pressing state of the lid 2 by the tip portion 73 of the pressing portion 7 is stably maintained.

[0029] Furthermore, in this embodiment, as shown in Figure 4, a fixing groove 32 is formed between the side wall portion 6 on the interior S1 side of the mounting base 3 and the first engaging portion 8, for housing fixing members such as screws 14 that fix the mounting base 3 to the wall material P. The fixing groove 32 is open to the interior S1 side and is formed over the entire longitudinal direction of the frame member 11. By screwing the screws 14 into the fixing groove 32 toward the exterior S2 side, the mounting surface 31 of the mounting base 3 and the interior S1 side surface of the wall material P at the periphery of the inspection opening T1 are in surface contact, and the mounting base 3 and the wall material P are fixed with screws. At the same time, the heads of the screws 14 are housed in the fixing groove 32, and when the retaining portion 7 is lowered, the heads of the screws 14 are hidden by the retaining portion 7.

[0030] Furthermore, in this embodiment, a base connecting groove 33 is formed at the bottom 321 of the fixing groove 32 to accommodate the connecting member 12 that connects the ends of each frame member 11. The base connecting groove 33 is open to the interior S1 side, its width is smaller than that of the fixing groove 32, and it is formed over the entire length of the frame member 11. The mounting base 3 and the connecting member 12 are welded together with the wing pieces of the connecting member 12 housed in this base connecting groove 33. Also, as shown in Figure 5(a), a small groove 331 is formed over the entire length of the frame member 11 at the center in the width direction of the bottom of the base connecting groove 33 to position the screw insertion position of the screw 14 in the fixing groove 32 at the center in the width direction of the fixing groove 32.

[0031] When installing the inspection opening frame structure 10 of this embodiment, configured as described above, in an inspection opening T1 opened in a wall material P, first, a frame body 1 is prepared in advance by framing a plurality of frame members 11 and connecting members 12, 13 to match the size of the inspection opening T1. This frame body 1 is then fitted into the inspection opening T1 from the room S1 side, so that the mounting surface 31 of the mounting base 3 of the frame body 1 comes into contact with the room S1 side surface of the wall material P around the periphery of the inspection opening T1.

[0032] Next, with the retaining portion 7 of the frame 1 raised to expose the fixing groove 32 of the mounting base 3, the screws 14 of the fixing member are screwed into the interior of the mounting base 3 and the wall material P from the interior S1 side within the fixing groove 32, thereby fixing the frame 1 to the interior S1 side surface of the wall material P around the inspection opening T1.

[0033] Next, as shown in Figure 6, with the retaining portion 7 of the frame 1 raised, the cover 2, which has been prepared in advance to match the size of the inspection opening T1, is fitted into the inspection opening T1 from the room S1 side, thereby closing the frame opening T2 of the frame 1 with the cover 2.

[0034] Then, as shown in Figure 3, by tilting the retaining portion 7 and engaging the first engaging portion 8 and the second engaging portion 9, the exterior side S2 of the lid 2 is supported by the support portion 5, and the interior side S1 of the lid 2 is pressed down by the tip portion 73 of the retaining portion 7. In this way, the inspection opening frame structure 10 of this embodiment is provided on the periphery of the inspection opening T1 of the wall material P, and the wall structure 100 having the inspection opening of this embodiment is constructed. In Figures 3 and 4, the reference numeral W indicates the visible width of the frame 1, and this visible width W is approximately equivalent to the front view width of the tilted retaining portion 7.

[0035] After installing the inspection hatch frame structure 10 of this embodiment in the inspection hatch T1, when opening the inspection hatch T1, the lid 2 can be easily removed from the frame opening T2 by raising the retaining portion 7 of the frame body 1 to disengage the first engaging portion 8 and the second engaging portion 9. On the other hand, when closing the inspection hatch T1, the lid 2 can be fitted into the frame opening T2 with the retaining portion 7 of the frame body 1 raised, and the frame opening T2 can be closed with the lid 2 by lowering the retaining portion 7 to engage the first engaging portion 8 and the second engaging portion 9.

[0036] As described above, according to the inspection hatch frame structure 10 of this embodiment, the frame body 1 has a mounting base 3 on which a mounting surface 31 is formed to be fixed to the interior S1 side surface of the wall material P, so that the frame body 1 can be directly fixed to the wall material P around the periphery of the inspection hatch T1. Therefore, unlike conventional inspection hatch frame structures in which the frame body was fixed to the base material of the wall material, the position of the inspection hatch is not restricted, and there is no need to newly attach a base frame along the periphery of the inspection hatch to the back side of the wall material, and it can be easily installed in an inspection hatch opened in the wall material.

[0037] Furthermore, according to the inspection hatch frame structure 10 of this embodiment, since the frame 1 is fixed to the interior S1 side surface of the wall material P at the periphery of the inspection hatch T1, even if the frame 1 or wall material P deforms slightly due to repeated attachment and detachment of the cover 2, changes in indoor and outdoor temperature and humidity, or deterioration over time, it is possible to suppress the occurrence of gaps between the mounting base 3 of the frame 1 and the interior S1 side surface of the wall material P, and the appearance of the inspection hatch frame structure 10 from the interior S1 side can be maintained well.

[0038] Furthermore, according to the inspection hatch frame structure 10 of this embodiment, since the mounting surface 31 is formed on the entire surface of the mounting base 3 on the outdoor S2 side, the frame 1 can be securely fixed to the indoor S1 side of the wall material P.

[0039] Furthermore, according to the inspection hatch frame structure 10 of this embodiment, the frame body 1 is constructed by framing a plurality of frame members 11 that extend along each side of the periphery of the inspection hatch T1. Therefore, the frame body 1 can be easily framed according to the shape, size, etc., of the inspection hatch T1 opened in the wall material P, and a more inexpensive inspection hatch frame structure can be provided.

[0040] Furthermore, according to the inspection hatch frame structure 10 of this embodiment, a fixing groove 32 for housing fixing members such as screws 14 for fixing the mounting base 3 to the wall material P is formed between the side wall portion 6 on which the retaining portion 7 is provided to be tiltable and the first engaging portion 8 that maintains the tilted state of the retaining portion 7 in the mounting base 3 of the frame body 1. Therefore, even when the mounting base 3 is screwed to the wall material P, the visible width W of the frame body 1 can be reduced, and the appearance of the inspection hatch frame structure 10 from the interior S1 side can be improved.

[0041] Furthermore, according to the inspection hatch frame structure 10 of this embodiment, a base connecting groove 33 is formed in the groove bottom 321 of the fixing groove 32 to accommodate a connecting member 12 that connects the ends of each frame member 11 constituting the frame body 1. Therefore, even when using a connecting member 12 to reinforce the connection between the ends of each frame member 11, the visible width W of the frame body 1 can be reduced, and the height of the side wall portion 6 can be lowered, improving the appearance of the inspection hatch frame structure 10 from the interior S1 side.

[0042] Furthermore, according to the inspection hatch frame structure 10 of this embodiment, a support portion connecting groove 51 is formed on the indoor S1 side surface of the support portion 5 of the frame body 1 for housing another connecting member 13 that connects the ends of each frame member 11. Therefore, a second connecting member 13 can be used to reinforce the connection between the ends of each frame member 11, and an inspection hatch frame structure having a frame body 1 that is simple in structure yet has excellent rigidity can be provided.

[0043] Furthermore, according to the wall structure 100 having an inspection opening of this embodiment, the wall material P is made of wood, and the frame 1 has a mounting base 3 with a mounting surface 31 that is fixed to the interior S1 side of the wall material P, and since this frame 1 is fixed to the wall material P from the interior S1 side, a wall / ceiling structure with an inspection opening can be constructed even if there is no base material or base frame on the back side of the wall material P.

[0044] Furthermore, according to the wall structure 100 having an inspection opening of this embodiment, as shown in Figures 3 and 4, the support portion 5 of the frame 1 does not protrude further outward S2 than the exterior S2 side surface of the wall material P. Since the exterior S2 side surface of the support portion 5 and the exterior S2 side surface of the wall material P are formed flush, the frame 1 can be securely fixed to the periphery of the inspection opening T1 even if there are interfering objects such as pipes on the back side of the wall material P. Note that, as shown in Figure 7, the exterior S2 side surface of the support portion 5 may be set back further inward S1 than the exterior S2 side surface of the wall material P.

[0045] Furthermore, according to the wall structure 100 having an inspection opening of this embodiment, as shown in Figures 3 and 4, when the frame 1 is fixed to the interior S1 side of the wall material P with screws 14, the length of the screws 14 is made shorter than the sum of the thickness of the mounting base 3 of the frame 1 and the thickness of the wall material P, so that the tip of the screw 14 does not protrude from the exterior S2 side of the wall material P. This also ensures that the frame 1 can be securely fixed to the periphery of the inspection opening T1 even if there are obstructions such as pipes on the back side of the wall material P.

[0046] The inspection hatch frame structure 10, the frame member 11 used therein, and the wall structure 100 having an inspection hatch have been described above, but the present invention can also be implemented in other embodiments.

[0047] For example, in the above embodiment, the mounting base 3 of the frame 1 is fixed to the interior S1 side surface of the wall material P with screws 14, but the present invention is not limited thereto, and the mounting base 3 and the wall material P may be fixed with other fixing members such as nails, staples, bolts and nuts. Also, as shown in Figure 7, the mounting surface 31 of the mounting base 3 and the interior S1 side surface of the wall material P may be fixed with adhesive 15, or they may be fixed with double-sided adhesive tape. Various design changes are possible considering the material and thickness of the wall material P, the properties of the interior S1 side surface (for example, whether or not there is wallpaper), etc.

[0048] Furthermore, in the above embodiment, the frame 1 is constructed by framing a plurality of frame members 11 and connecting members 12 and 13, but the present invention is not limited thereto, and the frame 1 may be framed using only the plurality of frame members 11 without using the connecting members 12 and 13. In this case, as shown in Figure 7, the formation of the base connecting groove 33 in the fixing groove 32 and the support part connecting groove 51 of the support part 5 in the above embodiment can be omitted, and the frame 1 can be simplified. In addition, by omitting the support part connecting groove 51 of the support part 5, the width of the support part 5 can be reduced, and the frame opening T2 of the frame 1 can be increased.

[0049] Furthermore, the entire frame 1 may be integrally molded into a frame shape by, for example, injection molding of a synthetic resin material.

[0050] Furthermore, in the above embodiment, an example in which the inspection opening frame structure 10 is provided in an inspection opening made in a wall material P has been described, and a wall structure 100 having an inspection opening has also been described. However, the present invention is by no means limited thereto, and the inspection opening frame structure 10 may be provided in an inspection opening made in a ceiling material, and of course, a ceiling structure having an inspection opening may also be provided.

[0051] The present invention can also be implemented in various forms with improvements, modifications, and variations based on the knowledge of those skilled in the art, without departing from its spirit. Furthermore, the invention may be implemented in a form in which any of the inventive features is replaced with other technologies within the scope of producing the same function or effect, and an inventive feature that is configured as a single unit may be configured as multiple members, or an inventive feature that is configured as multiple members may be configured as a single unit. [Explanation of Symbols]

[0052] 100 Wall structure with inspection opening 10. Inspection hatch frame structure 1 frame 11 Frame members 12 Connecting members 13 Other connecting members 14. Screws (fixing components) 2 Lid 3. Mounting base 31 Mounting surface 32 Fixed groove 321 Bottom of the groove (of the fixed groove) 33 Base connection groove 4 Extension 5 Support part 51 Support connection groove 6. Side wall section 7. Pressing part 8 First engaging part 9 Second engaging part P wall material S1 Interior S2 outdoor T1 Inspection Hatch T2 frame opening

Claims

1. An inspection opening frame structure provided in an inspection opening made in a wall or ceiling material that separates the interior from the exterior, A frame provided around the periphery of the inspection opening, A lid is provided so as to be detachable from the frame opening of the frame body, Equipped with, The frame has a mounting base formed on which a mounting surface is fixed to the interior side surface of the wall material or the ceiling material, and is constructed by framing a plurality of frame members that extend along each side of the periphery of the inspection opening. The frame member is An extension portion extending from the end of the mounting base on the inspection port side toward the exterior side, A support portion extends from the outer end of the extension toward the inspection opening and supports the outer surface of the cover that closes the frame opening, A side wall portion extending inward from the end of the mounting base opposite to the inspection opening side, A pressing portion is provided at the interior end of the side wall portion so as to be foldable, and presses against the interior surface of the lid that closes the frame opening, A first engaging portion is provided at the end of the mounting base on the inspection port side, A second engaging portion is provided on the pressing portion and detachably engages with the first engaging portion, Equipped with, An inspection hatch frame structure characterized in that a fixing groove for housing a fixing member for fixing the mounting base to the wall material or ceiling material is formed between the interior side wall portion and the first engagement portion of the mounting base.

2. The inspection hatch frame structure according to claim 1, characterized in that the mounting surface is formed on the entire outdoor surface of the mounting base.

3. The inspection opening frame structure according to claim 1, characterized in that a base connecting groove is formed at the bottom of the fixing groove for housing a connecting member for connecting the ends of each frame member along each corner of the periphery of the inspection opening.

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