Ceiling inspection hatch and installation method for ceiling inspection hatch

Abstract

To provide a ceiling inspection port contributing to the improved design of the indoor side without exposing an inner frame, reassuring a space near an opening of the inspection port, contributing to the improved workability of maintenance and inspection of wiring and piping, saving a manufacturing process at a construction site, and contributing to the compliance of the entire construction plan.SOLUTION: A ceiling inspection port comprises a rail 1 formed at an opening wall W situated around an opening H of a ceiling material S and a closing member 2 sliding the rail 1. The rail 1 has a rail first end 11 situated at one end side in a parallel direction to the opening H and a rail second end 12 situated at the other end side in the parallel direction and at the opening H side in an orthogonal direction to the opening H rather than the rail first end 11. The closing member 2 has a plate-like part 21 in a substantially same shape and in a same dimension with the opening H and a rotational shaft part 22 mounted at one end side of the plate-like part 21 and stored in the rail 1. In a closed state, the plate-like part 21 is stored in the opening H in a flush shape and the rotational shaft part 22 is situated at the rail first end 11 and in an opened state, the rotational axis part 22 is situated at the rail second end 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ceiling inspection hatch in, for example, an apartment building. [Background technology]

[0002] Conventionally, in buildings such as apartment buildings and commercial facilities, there are ceiling inspection hatches that are attached to openings formed in ceiling materials to maintain and inspect wiring, piping, etc. installed above the ceiling. Typical ceiling inspection hatches are either wide frame types or narrow joint types, and are made of metal such as aluminum or steel, and have an outer frame that is installed in the opening and an inner frame that fits inside the outer frame, with ceiling material cut out when the opening is formed or separately prepared gypsum board fitted inside the inner frame.

[0003] Furthermore, for example, Patent Document 1 discloses a ceiling inspection hatch in which an outer frame is connected to a storage frame that houses an inner frame installed above the ceiling, and stepped rails are installed continuously between the outer frame and the storage frame, and the inner frame slides along the rails, closing when it fits inside the outer frame and opening when it fits inside the storage frame. This configuration makes it easy to install in an opening in the ceiling material, and is expected to prevent problems such as deformation of the rails. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-339561 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with both types of standard ceiling inspection hatches, the outer and inner frames are exposed to the room, which can detract from the appearance of not only the ceiling but the entire room. Furthermore, with the joint type, which is considered to have a higher design value than the frame type, the width of the inner frame is narrower, so if the inner dimensions of the inner frame do not match those of the board to be fitted into, there is a risk of a gap occurring between the inner frame and the board. To overcome these problems, a structure that does not require an inner frame is ideal.

[0006] Furthermore, in a structure where the inner frame rotates relative to the outer frame via a rotation axis, there is a risk that the inner frame will collide with the outer frame when rotating, and if the rotation axis is moved too close to the center of the opening in the direction parallel to the outer frame to avoid this, not only will the opening area be narrowed, but when open, the shorter side of the inner frame beyond the rotation axis will protrude into the ceiling, which may become an obstacle when maintaining and inspecting wiring, piping, etc. To overcome these problems, it is necessary to improve the position of the rotation axis.

[0007] In Patent Document 1, not only is it time-consuming to install a storage frame above the ceiling, but the installed storage frame may become an obstacle during maintenance and inspection of wiring, piping, etc. From this perspective, based on the idea of ​​the inner frame moving on rails described in Patent Document 1, it is not easy to come up with new ideas regarding the shape and range of the rails along which the rotating shaft moves, and the route of movement, for a structure that rotates via a rotating shaft.

[0008] Furthermore, with a typical ceiling inspection hatch, for example, the time required for construction to prepare the ceiling material and gypsum board to be fitted inside the inner frame at the construction site can affect the progress of other processes. In other words, if the process of cutting out the board material to be fitted into the inner frame and the process of fitting the board material into the inner frame are not carried out at the construction site, it is easier to plan the construction of the ceiling inspection hatch and progress as planned, so it is desirable to complete these processes in advance.

[0009] Therefore, the object of the present invention is to provide a ceiling inspection hatch and a construction method for a ceiling inspection hatch that contributes to improving the design of the interior without exposing the inner frame, that contributes to improving the workability of maintaining and inspecting wiring, piping, etc. by securing space near the opening of the inspection hatch, and that contributes to compliance with the overall construction plan by eliminating the manufacturing process at the construction site. [Means for solving the problem]

[0010] In other words, the ceiling inspection hatch of the present invention comprises a rail formed on the opening wall located around the opening in the ceiling material, and an opening / closing member that slides on the rail, the rail having a rail first end located on one end side parallel to the opening, and a rail second end located on the other end side parallel to the opening and perpendicular to the rail first end, the opening member having a plate-shaped portion of approximately the same shape and dimensions as the opening, and a rotating shaft portion attached to one end side of the plate-shaped portion and fitted into the rail, and characterized in that in the closed state, the plate-shaped portion fits flush with the opening and the rotating shaft portion is positioned at the rail first end, and in the open state, the rotating shaft portion is positioned at the rail second end.

[0011] With this configuration, since the opening and closing member does not have an inner frame, it is expected that when closed, it will appear to be one with the ceiling material from the indoor side; as the opening and closing member moves and rotates from the first end of the rail towards the second end of the rail, the shorter side of the opening and closing member from the rotating shaft will not hit the opening wall, and it is expected that there will be a smooth transition from the closed state to the open state; as the opening and closing member lowers when in the open state according to the difference in height between the first end of the rail and the second end of the rail, it is expected that the shorter side will not protrude too much into the attic; and as the opening and closing member has a structure that can be produced in a process that is not dependent on and is unlikely to affect other processes at the construction site, it is expected that the overall construction will be easy.

[0012] Below, definitions and examples of the technical elements that make up the ceiling inspection hatch of the present invention are provided.

[0013] "Ceiling materials" are materials that form the ceilings of buildings, vehicles such as ships and aircraft, and other structures, and are made of any of the following materials: resin, wood, paper, metal, or gypsum, or a combination of two or more materials, with no restrictions on dimensions such as thickness or area. Ceiling materials used in buildings, for example, comprise multiple, long, thin rod-shaped base materials arranged at specified intervals, and plate-shaped surface materials nailed to the base materials.

[0014] An "opening in a ceiling material" is, for example, a through hole formed by cutting out a specified location in the ceiling material, or a through hole formed by a frame material provided on the edge of the through hole, but is not limited to this.

[0015] An "opening wall located around the opening" is a wall-like part that rises from the edge of the opening toward the ceiling space, and may be, for example, a specified part of one type of material, a part formed by overlapping two or more types of material such as ceiling material used in buildings, or a specified part of the above-mentioned frame material.

[0016] "Buildings" include, for example, apartment buildings, detached houses, temporary housing, schools, hospitals, elderly care facilities, facilities for the disabled, and various commercial facilities, and are not limited to structures such as reinforced concrete, steel-framed reinforced concrete, or steel-frame construction, or to sizes. When the "building" is an apartment building, there are no limitations on the specifications of each room in the apartment building in which the present invention is implemented, such as floor plan, size, structure, and construction method.

[0017] A "rail" is something that allows the opening / closing member to slide freely at least in a direction parallel to the opening, or in a direction parallel and perpendicular to the opening (in a stepped manner). For example, it may be a groove formed in the surface of the opening wall with a predetermined shape and depth, or a member separate from the ceiling material that is attached to the opening wall. The "first rail end" and the "second rail end" may be the starting and ending ends of the opening / closing member that moves on the rail. The space between the "first rail end" and the "second rail end" may be an arc bulging upward or downward from the opening, or may be stepped.

[0018] The "opening / closing member" rotates and moves on the rail via a rotating shaft, and the rotation and movement may occur simultaneously or separately; in other words, the rotation and movement may occur continuously while rotating, or intermittently. The "plate-shaped portion" may be a plate cut out to form an opening in the ceiling material, or a plate different from the ceiling material. The "rotating shaft" may be, for example, a resin part, and may be attached directly to the plate-shaped portion or indirectly attached via another member, with no restrictions on shape, size, or material.

[0019] The "closed state" also refers to a state in which the opening / closing member is fastened to the ceiling material via a specified jig, and the angle between the opening and the opening / closing member is approximately zero. The "open state" also refers to a state in which the opening / closing member is hanging from the rail, and the angle between the opening and the opening / closing member is approximately 90°.

[0020] In addition, in the ceiling inspection hatch of the present invention, it is desirable that the opening and opening wall are constructed from a frame material that is separate from the ceiling material, and that the rails are grooves formed in the frame material.

[0021] With this configuration, it is easy to determine the overall specifications, including the opening and closing members, based on the shape, dimensions, and material of the frame material. For example, if the frame material is made of resin, it is easy to process grooved rails, it is lightweight, and it is less likely to wear out even when subjected to friction from the rotating shaft, which is expected to improve workability and ensure durability.

[0022] In addition, the ceiling inspection hatch of the present invention further includes an engaging member that holds the opening / closing member in a closed state, and it is desirable that the engaging member has a first engaging portion provided on the other end side of the plate-shaped portion and a second engaging portion provided on the opening wall so as to be able to engage freely with the first engaging portion.

[0023] With this configuration, the engaging member is not exposed to the indoor side when the opening / closing member is closed, so the sense of unity between the opening / closing member and the ceiling material is not compromised, and since it is easy to release the engagement of the first engaging portion with the second engaging portion, it is expected that the opening / closing member will open and close smoothly.

[0024] The "engaging member" is any member that supports the opening / closing member with the second engaging portion via the first engaging portion to prevent it from falling. For example, it may be a magnetic type or an interlocking type, but preferably it is an interlocking type that can be easily released even with a weak external force.

[0025] The method for constructing a ceiling inspection hatch in the present invention is characterized by including the steps of: preparing a frame material having a rail formed thereon and a frame material having a second engagement portion; preparing an opening / closing member having a plate-shaped portion having a rotating shaft portion and a first engagement portion; installing the frame material as an opening wall located around the opening in the ceiling material; and fitting the rotating shaft portion into the rail and attaching the opening / closing member to the frame material.

[0026] According to these processes, the preparation of the frame material and the opening / closing members can be carried out separately, and the opening / closing members can be attached after the frame material is installed, which avoids precise work at the construction site and is expected to reduce the workload at the construction site. [Effects of the Invention]

[0027] According to the present invention, it is possible to improve the design of the interior without exposing the inner frame, to secure space near the opening of the inspection hatch and thereby improve the workability of maintenance and inspection of wiring, piping, etc., and to eliminate the manufacturing process at the construction site and thereby contribute to compliance with the overall construction plan. [Brief explanation of the drawings]

[0028] [Figure 1] 1A and 1B show a closed state and an open state, respectively, of a ceiling inspection hatch according to an embodiment of the present invention. [Figure 2] This is a plan view (a) of the ceiling inspection hatch in the closed state from the ceiling side, a cross-sectional view (b) of the plan view taken along X1-X1, and a cross-sectional view (c) of the plan view taken along X2-X2. [Figure 3] FIG. 2 is a diagram illustrating the rails used in the above-mentioned ceiling inspection hatch. [Figure 4] FIG. 2 is a diagram illustrating the rotating shaft portion used in the above-mentioned ceiling inspection hatch. [Figure 5]10A is a diagram illustrating the engaging member used in the ceiling inspection hatch during engagement (FIG. 10A), after release (FIG. 10B), and before engagement (FIG. 10C). [Figure 6] FIG. 2 is a plan view of the ceiling inspection hatch in a closed state, as seen from the indoor side. DETAILED DESCRIPTION OF THE INVENTION

[0029] Below, with reference to the various drawings, we will explain the ceiling inspection hatch (hereinafter also referred to as the "main ceiling inspection hatch") and the installation method for the main ceiling inspection hatch in one embodiment of the present invention. In these drawings, where there are multiple identical parts, only one part is numbered. For ease of explanation, certain parts and the lead lines to these parts are also shown with hidden lines (dashed lines). In the explanation, terms indicating directions such as up, down, length, width, and vertical direction are basically based on a normal building, and if other references are used, they will be explained appropriately.

[0030] <Overview of the ceiling inspection hatch> As shown in FIG. 1, this ceiling inspection hatch is used for maintaining and inspecting wiring, piping, and the like located behind the ceiling T of a room R on a given floor of a building. It includes a rail 1 formed on an opening wall W located around an opening H in a ceiling material S, an opening / closing member 2 that slides on the rail 1, and an engaging member 3 that holds the opening / closing member 2 in a closed position. The rail 1 has a first rail end 11 located on one end parallel to the opening H, and a second rail end 12 located on the other end parallel to the opening H and perpendicular to the opening H from the first rail end 11. The opening / closing member 2 has a plate-shaped portion 21 that is approximately the same shape and dimensions as the opening H, and a rotating shaft portion 22 that is attached to one end of the plate-shaped portion 21 and fits into the rail 1. The engaging member 3 has a first engaging portion 31 located on the other end of the plate-shaped portion 21 and a second engaging portion 32 located on the opening wall W so as to be detachably engaged with the first engaging portion 31. In the closed state, the plate-shaped portion 21 fits flush with the opening H, and the rotating shaft portion 22 is located at the first end 11 of the rail, and in the open state, the rotating shaft portion 22 is located at the second end 12 of the rail.

[0031] Below, we will provide a detailed explanation of this ceiling inspection hatch, taking into account its overview.

[0032] <Ceiling Material S Details> As shown in FIG. 2, the ceiling material S comprises a plurality of thin, rod-like base materials S1 arranged at predetermined intervals, and a plate-like surface material S2 fixed to the base material S1 with screws or the like (not shown). The base material S1 may be made of resin, metal, or wood, and may be hollow or solid. The surface material S2 may be gypsum board (plasterboard) or a metal panel, and is not limited thereto. The through-hole for this ceiling inspection hatch is formed in the surface material S2, preferably in a location surrounded by the base material S1 and not interfering with the base material S1. As an example of dimensions, the base material S1 is 40 mm square, and the surface material S2 is 9.5 mm thick.

[0033] <Details of frame material F> As shown in Figure 2, frame material F corresponds to the outer frame of the main ceiling inspection hatch. Considering workability and durability, frame material F is preferably made of resin. Frame material F is located closer to the through hole for the main ceiling inspection hatch than base material S1, and is placed on surface material S2 adjacent to base material S1 and fixed with screws or the like (not shown), covering the end face of surface material S2. Opening H and opening wall W are made up of frame material F, and opening wall W corresponds to the inner end face of frame material F. As an example of dimensions, opening H is 450 mm square and opening wall W is 55 mm high.

[0034] <Rail 1 details> As shown in FIGS. 2 and 3 , the rail 1 is a groove formed in a frame material F. The rail 1 has a substantially circular first rail end portion 11 located at one end parallel to the opening H and approximately at the center of the frame material F in the height direction; a substantially circular second rail end portion 12 located at the other end parallel to the opening H from the first rail end portion 11 and closer to the opening H in the perpendicular direction, and lower than the first rail end portion 11; and a rail inlet portion 13 extending from the upper end of the frame material F to the first rail end portion 11 and the second rail end portion 12. As an example of dimensions, the depth of the groove-shaped rail 1 is 10 mm. The diameters of the first rail end portion 11 and the second rail end portion 12 and the width of the rail inlet portion 13 may be determined depending on the diameter of a rotating shaft (not shown).

[0035] Referring to Figure 3, an example of the conditions for determining the positional relationship between the first rail end 11 and the second rail end 12 is shown below. Of these examples, only one of the first and second conditions may be satisfied, but it is more preferable if both are satisfied. Figure 3 is an enlarged view of the rail 1 from the same direction as Figure 2(b), and for ease of explanation, the open / close member 2 is shown by a dashed line.

[0036] As a first condition, the straight-line distance M1 perpendicular to the rotation axis connecting the center of the first end 11 of the rail and the portion of the plate-shaped portion 21 that moves in an orbit on the outermost side when the opening / closing member 2 rotates is preferably shorter than the straight-line distance M2 connecting the center of the second end 12 of the rail and the opening wall W that the opening / closing member 2 approaches when it rotates, thereby preventing the above-mentioned portion from colliding with the opening wall W when the opening / closing member 2 is transitioned from the closed state to the open state.

[0037] As a second condition, the straight-line distance N1 connecting the center of the first end 11 of the rail and the opening wall W that the opening / closing member 2 approaches when rotating is preferably shorter than the vertical distance N2 from the center of the second end 12 of the rail to the upper end of the frame material F, thereby preventing the opening / closing member 2 from protruding beyond the upper end of the frame material F when in the open state.

[0038] In this way, the positions of the first rail end 11 and the second rail end 12 may be determined based on the first and second conditions. The first rail end 11 may be located anywhere between approximately the center and the top end of the frame material F in the height direction. The second rail end 12 may be located anywhere up to approximately the center in the direction parallel to the opening H. However, the closer the second rail end 12 is located to the center, the greater the travel distance of the opening / closing member 2 becomes, and the more the opening H is divided in the open state, resulting in a narrower opening area. Therefore, to avoid these drawbacks, the first rail end 11 is preferably located near one end in the direction parallel to the opening H.

[0039] <Details of opening and closing member 2> As shown in Figure 2, the opening / closing member 2 has approximately the same shape and dimensions as the opening H, and includes a plate-like portion 21 that is rectangular in plan view and fits into the opening H with a gap between it and the opening wall W when closed, and a rotating shaft portion 22 that is attached to one end of the plate-like portion 21 and fits into the rail 1 so that the plate-like portion 21 slides and rotates on the rail 1. In other words, because the opening / closing member 2 does not have an inner frame for an outer frame like a conventional ceiling inspection hatch, the gap between the frame material F and the plate-like portion 21 (hereinafter also referred to as the "joint width") can be 3 mm or less, which contributes to improved design compared to the conventional gap of 3.5 mm or more required between the outer frame and inner frame to take interference countermeasures into account.

[0040] The plate-shaped portion 21 may be thinner or thicker than the surface material S2, and may be made of the same material as or a different material from the surface material S2. For example, it may be gypsum board (plasterboard), but it may also be a 6 mm thick calcium silicate board, prioritizing weight reduction in order to reduce the impact of accidents caused by the opening / closing member 2 falling. The plate-shaped portion 21 has a square timber-shaped base 21a to which the rotating shaft portion 22 is attached. The base 21a has a length approximately equal to one side of the plate-shaped portion 21, and is fixed near both ends of the plate-shaped portion 21 with screws or the like (not shown), thereby also contributing to the reinforcement of the plate-shaped portion 21.

[0041] FIG. 4 is an enlarged view of the rotating shaft portion 22 from the same direction as FIG. 2(c). For ease of explanation, other components are indicated by dashed lines. As shown in FIG. 5, the rotating shaft portion 22 has a shaft center 22a that fits within the rail 1 and a shaft base 22b that is integral with the shaft center 22a and larger than the shaft center 22a. The diameter of the shaft center 22a is equal to or smaller than the width of the rail 1, including the diameters of the first rail end 11 and the second rail end 12. The diameter of the shaft base 22b is larger than the diameter of the shaft center 22a. This arrangement facilitates maintaining a constant joint width because the shaft base 22b is interposed between the frame material F and the base 21a. The rotating shaft portion 22 is preferably made of a material resistant to wear on the rail 1, such as, but not limited to, nylon resin. The rotating shaft portion 22 is fixed to the base 21a with screws or the like.

[0042] <Details of Engagement Member 3> 2, the engaging member 3 has a first engaging portion 31 provided on the other end side of the plate-shaped portion 21 located on the opposite side from the rotating shaft portion 22, and an L-shaped second engaging portion 32 provided on the frame material F that is the opening wall W so as to fit into and detachably engage with the first engaging portion 31, and is, for example, a swing-type latch. Fig. 5 is an enlarged view of the periphery of the engaging member 3 from the same direction as Fig. 2(b).

[0043] 5(a), the first engagement portion 31 is fixed on a base 21b installed on the plate-shaped portion 21, and has a latch 31a which is a pressing portion, a spring 31b which follows the movement of the latch 31a, and a slit 31c through which the tip of the second engagement portion 32 is inserted. When the second engagement portion 32 is fitted into the slit 31c, the plate-shaped portion 21 is in a closed state.

[0044] 5(b), when the latch 31a is pressed against the joint with a thin object, the spring 31b moves in response to the movement of the latch 31a, and the movement of the spring 31b tilts the first engaging portion 31, causing the second engaging portion 32 to come out of the slit 31c. Immediately after the engagement is released, the plate-shaped portion 21 starts to rotate due to its own weight.

[0045] As shown in FIG. 5(c), the engagement is performed by rotating the plate-shaped portion 21, causing the second engagement portion 32 to slide over the inclined tip of the first engagement portion 31 and engage with the slit 31c.

[0046] <Closed state of opening / closing member 2> As shown in Figure 6, when looking up at the ceiling T from the living room side, the opening / closing member 2 is contained within the opening H, and all that is visible is a part of the frame material F and the joint, which is the gap between the frame material F and the opening / closing member 2, ensuring the aesthetic design of the interior, including the ceiling. On the other hand, since only a small portion of the axis 22a of the pivot shaft portion 22 and the second engaging portion 32 of the engaging member 3 are visible from the joint, it is difficult to say that they detract from the aesthetic design of the interior, but the joint may be covered from the underside of the ceiling with a specified cover member to prevent them from being visible from the joint.

[0047] <Effects of the ceiling inspection hatch> Therefore, as shown in Figures 1 and 6, since the opening / closing member 2 does not have an inner frame, when closed it appears to be integrated with the ceiling material S from the indoor side, and as the opening / closing member 2 moves and rotates from the first rail end 11 toward the second rail end 12, the shorter side of the opening / closing member 2 from the rotating shaft portion 22 does not come into contact with the opening wall W, allowing for a smooth transition from the closed state to the open state, and as the opening / closing member 2 lowers when in the open state in accordance with the difference in height between the first rail end 11 and the second rail end 12, the shorter side does not protrude too much into the attic.

[0048] Furthermore, it is easy to determine the overall specifications including the opening and closing member 2 based on the shape, dimensions and material of the frame material F, and in particular, if the frame material F is made of resin, it is easy to process the grooved rail 1, it is lightweight, and it is less likely to wear even when subjected to friction from the rotating shaft portion 22, thereby improving workability and ensuring durability.

[0049] Furthermore, since the engaging member 3 is not exposed to the indoor side when the opening / closing member 2 is in the closed state, the sense of unity between the opening / closing member 2 and the ceiling material S is not impaired, and since the engagement state of the first engaging portion 31 with the second engaging portion 32 can be easily released, the opening / closing member 2 can be opened and closed smoothly.

[0050] <Overview of the installation method for the ceiling inspection hatch> The construction method of the above-mentioned ceiling inspection hatch is not limited, but for example, as shown in Figure 2, it includes the following steps: a first step of preparing a frame material F on which a rail 1 is formed and a frame material F on which a second engagement portion 32 is provided; a second step of preparing an opening / closing member 2 on which a rotating shaft portion 22 and a first engagement portion 31 are provided on a plate-shaped portion 21; a third step of installing the frame material F on which the rail 1 is formed and the frame material F on which the second engagement portion 32 is provided as an opening wall W located around the opening H in the ceiling material S; and a fourth step of attaching the opening / closing member 2 to the frame material F on which the rail 1 is formed via the rotating shaft portion 22.

[0051] <Effects of the installation method for this ceiling inspection hatch> According to these processes, preparation of the frame material F, including the formation of the rail 1, and preparation of the opening and closing member 2, including the attachment of the rotating shaft portion 22, can be carried out in different locations or at different times, and further, the opening and closing member 2 can be attached after the frame material F is installed on the ceiling material S, which avoids precise work at the construction site and reduces the workload at the construction site. Because the opening and closing member 2 is detachable from the rail 1, maintenance of this ceiling inspection hatch is also easy.

[0052] This embodiment is not limited to the above-described content, and includes any position, shape, or size of parts, relationships between parts, construction plans, and relationships with other construction work, as long as the same effect can be obtained. [Explanation of symbols]

[0053] R living room T ceiling S ceiling material, S1 base material, S2 surface material F Frame material H opening W Opening wall 1 rail 11 Rail first end 12 Rail second end 13 Rail entrance 2 Opening and closing members 21 plate-shaped portion, 21a base 22 Rotating shaft part, 22a axis center, 22b axis center 3 Engagement member 31 first engagement portion, 31a latch, 31b spring, 31c slit 32 second engagement portion

Claims

1. a rail formed on an opening wall located around the opening of the ceiling material; an opening / closing member that slides on the rail, The rail is a first end portion of the rail located on one end side in a direction parallel to the opening; the rail second end portion is located on the other end side of the rail first end portion in a direction parallel to the opening and on the opening side in a direction perpendicular to the opening; a rail inlet portion located directly above the rail second end portion; The opening and closing member is a plate-like portion having substantially the same shape and dimensions as the opening; a rotation shaft portion attached to one end side of the plate-shaped portion and fitted into the rail, In a closed state, the plate-shaped portion is fitted flush with the opening, and the rotation shaft portion is positioned at the first end of the rail. In the open state, the rotation shaft portion is located at the second end of the rail. A ceiling inspection hatch characterized by:

2. The space between the first end of the rail and the second end of the rail is stepped, with the slope on the second end of the rail being steeper than the slope on the first end of the rail, based on a horizontal plane.

2. The ceiling inspection hatch according to claim 1.

3. Further comprising an engaging member that holds the opening / closing member in a closed state, The engaging member is a first engaging portion provided on the other end side of the plate-shaped portion; a second engaging portion provided on the opening wall so as to be detachably engaged with the first engaging portion; 3. The ceiling inspection hatch according to claim 1 or 2.

4. A step of preparing the frame material on which the rail is formed and the frame material on which the second engagement portion is provided; preparing the opening / closing member, the plate-shaped portion of which is provided with the rotation shaft portion and the first engagement portion; a step of installing the frame material on which the rail is formed and the frame material on which the second engagement portion is provided as the opening wall located around the opening of the ceiling material; and a step of attaching the opening / closing member to the frame member on which the rail is formed via the rotating shaft portion.

4. The method for constructing a ceiling inspection hatch according to claim 3.

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