JP5424966B2 - Ceiling access door - Google Patents

Description

  The present invention relates to a ceiling inspection port provided on a ceiling of a house or the like.

  The ceiling of a house is generally provided with a ceiling inspection opening as an opening when an inspector performs inspection work behind the ceiling. This ceiling inspection port is sealed with an inspection lid when not in use, but with only one inspection lid, the airtightness and heat insulation of the living space are impaired due to intrusion of outside air from the gap and heat radiation from the inspection lid to the ceiling. There is a high risk. Therefore, it is common to further improve the airtightness and heat insulating property of the living space by further attaching a heat insulating cover having heat insulating properties on the upper side of the inspection cover and providing double covers.

  Conventionally, as a means for locking the heat insulating lid, a structure is known in which a flange portion is provided on the upper portion of the heat insulating inner lid, and the upper end surface of the mounting frame and the flange portion are engaged and locked (for example, Patent Documents). 1).

  In addition, a retractable bracket that is sandwiched between a plate portion that is extended to the upper end of the inner frame and a presser bracket that is screwed to the plate portion is interposed, and the above-described bracket is pulled out into the storage space. A structure for locking a heat insulating lid is known (see, for example, Patent Document 2).

  In addition, in order to further improve the heat insulation performance, the heat insulation outer frame is formed of a foam material, and a substantially L-shaped mounting bracket attached to the field edge provided on the ceiling is pierced into the heat insulation outer frame, thereby A structure for fixing the frame is known (for example, see Patent Document 3).

JP 11-159120 A JP 2009-144449 A JP 2001-349047 A

  However, in the technique described in Patent Document 1, when performing an operation of removing the heat insulating inner lid from the ceiling opening to the indoor side through the mounting frame, the heat insulating inner lid is lifted upward and rotated and tilted, Since the flange is caught, it cannot pass through the mounting frame. For this reason, there is a problem that the removal work cannot be performed unless a space behind the ceiling is secured for lifting and rotating the heat insulating inner lid upward.

  In addition, the technique described in Patent Document 2 has a problem that the number of parts for preventing the thermal insulation lid from falling is large, which is costly and troublesome.

  In addition, in the technique described in Patent Document 3, for example, when attaching a heat insulating lid, if a pushing force is applied to the heat insulating outer frame more than necessary, the L-shaped mounting bracket is deformed to generate a gap, resulting in airtightness and heat insulation. There is a risk that the efficiency may decrease.

  The present invention has been made in view of the above circumstances, and can reduce installation labor and cost with a small number of components, and can securely lock the heat insulating lid and can be easily and safely inserted and removed. The purpose is to provide a ceiling inspection port.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided between a rectangular outer frame fitted and fixed in a ceiling opening established on a ceiling surface, and two opposite sides of the outer frame. An inner frame formed so as to be openable and closable via a rotating member, and provided with a lid inside, a rectangular heat insulating frame disposed above the outer frame and fixed to a ceiling base girder, and the outer frame And a ceiling inspection opening comprising a heat insulating lid detachably disposed in the opening of the heat insulating frame, the outer frame having a fixed piece pivotally supported in a vertical direction, A heat insulation lid fall prevention device comprising a press piece bent orthogonally from an end of the fixed piece is attached to at least two opposite sides, and the heat insulation lid fall prevention device makes the fixed piece vertical. It is formed so that it can be switched between a vertical posture and a horizontal posture to make it horizontal. By abutting the lower surface of the heat insulating lid, the heat insulating lid is prevented from dropping, and in the horizontal posture, the presser piece comes close to a side perpendicular to the side of the outer frame on which the fixed piece is fixed. Thus, the heat insulating lid is formed so as to be insertable and removable.

  By configuring in this way, the heat insulation lid fall prevention device is configured so that, in the vertical posture, the presser piece comes into contact with the lower surface of the heat insulation lid to prevent the heat insulation lid from falling. Does not fall unexpectedly, and the heat insulating lid can be reliably locked. Further, in the horizontal posture, the presser piece is close to the side perpendicular to the side of the outer frame on which the fixed piece is pivoted, so that an operator can easily and safely insert and remove the heat insulating lid. Furthermore, since the heat insulation lid fall prevention tool is accommodated along the edge of the outer frame and the opened inner frame, the work space of the worker is not obstructed.

  In the present invention, the heat insulating frame is formed of a foam heat insulating resin material, and is fixed to the ceiling base girder by a fixture, and the fixture has a flat base and sides facing the base. The front ends of the fixed claws are formed in a cross-sectional shape, and the fixed claws are sharpened to each other.The fixed claws are inserted into the outer side surface of the heat insulating frame, and the base portion and the It is better to fix the ceiling base beam with a fixing member (claim 2).

  With this configuration, the fixing claws of the fixing tool are inserted in the shape of a letter C on the outer side surface of the heat insulating frame, so even if a force that pushes up the heat insulating frame more than necessary acts, the fixing claws Since it protrudes in the shape of a letter, it is resistant to deformation and is firmly fixed to the ceiling base girder, so that a gap is hardly formed between the heat insulating frame and the ceiling base girder.

  Furthermore, in the present invention, the presser piece of the heat insulating lid drop prevention tool in the horizontal posture when the inner frame is opened is formed so as to be engageable with the inner frame when the inner frame is closed. In conjunction with the closing operation of the frame, it is better to form the thermal insulation lid fall prevention device so as to switch to the vertical posture (claim 3).

  With this configuration, when closing the inner frame, even if you forget to switch the insulation lid fall prevention device from the horizontal posture to the vertical posture, the insulation lid fall prevention device will close the inner frame. Since it can be switched to the vertical posture in conjunction with the operation, the heat insulating lid does not fall when the inner frame is opened again.

  According to this invention, since it is configured as described above, the ceiling inspection port is formed with a small number of components, so that it is possible to reduce the installation effort and cost, and to securely lock the heat insulating lid. It can be easily and safely inserted and removed.

It is sectional drawing which shows an example of the ceiling inspection opening which concerns on this invention. FIG. 2 is an enlarged sectional view of a portion I in FIG. 1. It is an expanded sectional view showing the state where the inner frame in this invention was opened. It is a top view which shows a part of ceiling inspection port which concerns on this invention in a cross section. The perspective view (a), (b) and the heat insulation lid fall prevention device in the horizontal posture with the heat insulation lid fall prevention device on the open / close base end side and the open / close free end side in the vertical posture with the inner frame in the present invention opened It is a perspective view (c), (d). It is a perspective view which shows the state which the heat insulation lid fall prevention tool in this invention switches to a vertical attitude | position in conjunction with the closing of an inner frame. It is a perspective view which shows the heat insulation lid and heat insulation frame in this invention. It is a perspective view which shows the fixing tool in this invention. It is sectional drawing which shows the attachment state of the said fixing tool. It is a perspective view which shows the ceiling opening and heat insulation frame in this invention. It is a perspective view which shows the state before attaching the inner frame in this invention. It is a perspective view which shows the state which attached the inner frame in this invention. It is a perspective view which shows the state which attached the heat insulation cover in this invention. It is a perspective view which shows the state which closed the inner frame in this invention. It is a perspective view which shows the insertion state of the heat insulation cover in this invention. It is a principal part expanded sectional view which shows another shape of the heat insulation frame in this invention.

  Hereinafter, an embodiment of a ceiling inspection port 1 according to the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1 to FIG. 4, the ceiling inspection port 1 according to the present invention is opposite to the outer frame 20 and a rectangular outer frame 20 that is fitted and fixed to a ceiling opening 3 that is opened on the ceiling surface 2. It is formed so as to be openable and closable via a rotating member 8 interposed between two sides, and is disposed above the inner frame 30 provided with a lid 31 inside and the outer frame 20 and fixed to the ceiling base beam 5. A rectangular heat insulating frame 15, a heat insulating lid 10 detachably disposed in the opening of the outer frame 20 and the heat insulating frame 15, a heat insulating lid fall prevention device 40 attached to the outer frame 20, and a heat insulating frame And a fixture 50 for fixing 15 to the ceiling base beam 5.

  The ceiling surface 2 has a ceiling board 4 made of, for example, plywood or a plaster board fixed to a ceiling base girder 5 made of wood. A ceiling opening 3 is formed in a square shape on the ceiling surface 2 formed in this manner, and a ceiling base girder material 5 is disposed on the peripheral edge of the ceiling opening 3 on the ceiling side. On the other hand, when the ceiling base beam 5 is not disposed at the peripheral edge, the peripheral edge on the ceiling side of the ceiling opening 3 may be surrounded by a wood-wood square.

  The outer frame 20 and the inner frame 30 are formed of, for example, an aluminum extruded shape member, and have a substantially reverse T-shaped cross section in which a vertical piece 25a and a flange portion 25b extending horizontally at the lower end portion of the vertical piece 25a are formed. It is formed from mold frame members 25A and 25B.

  The frame member 25A that forms the outer frame 20 is provided with a tapered recess 28 that is widened and opened on the inner side in the middle portion of the vertical piece 25a and protrudes outward. Both end portions of the frame member 25A are cut at 45 degrees, and are formed into a rectangular shape by abutting and joining the adjacent frame member 25A with the angle-shaped fixing bracket 29 and performing caulking (see FIG. 11). .

  The dish-shaped head of the fixing screw 27 that is screwed to the ceiling base beam 5 through the through hole in which a hole is formed at an appropriate position of the recess 28 of the outer frame 20 formed in this way is the recess 28. (See FIGS. 2 and 3).

  The inner frame 30 is formed in a square shape by cutting both ends of the frame member 25B at 45 degrees, abutting and joining the adjacent frame member 25B with the angle-shaped fixing bracket 35, and performing a caulking process. (See FIGS. 5A, 5C, and 12). A lid 31 formed by appropriately adjusting the size of a plate material that substantially matches the size of the ceiling opening 3 cut out when the ceiling opening 3 is opened is fixed to the inner frame 30. The lid member 31 is fixed in the form of an angle that comes into contact with the vertical piece 25a of the inner frame 30 and the upper end surface of the lid member 31 in a state where the lid member 31 is placed on the flange portion 25b extended to the inner frame 30. The metal fitting 36 is fixed with screws (see FIG. 4). In addition, the sealing material 23 which is an airtight material is interposed in the part which the flange part 25b of the inner frame 30 and the cover material 31 overlap, and airtight performance is maintained.

  The rotating member 8 is formed in a portion in which one piece of the angle-shaped fixing bracket 35 mounted on the outer peripheral surface of the corner portion on the base end side of the inner frame 30 is projected in a step shape by pressing. The shaft portion 30a is composed of a synthetic resin bearing 9a in which a bearing tube portion whose upper side is open is provided on the surface of the fixed base portion 9 attached to the inner surface of the outer frame 20. The fixed base 9 provided with the bearing 9a is formed with an engaging portion 9b that engages with a presser piece 42 of a heat insulating lid drop preventing tool 40 described later.

  The flange 25b at the end of the outer frame 20 on the rotating member 8 side is provided with a notch (not shown) for avoiding interference when the inner frame 30 rotates. In order to close the gap between the notch and the outer frame 20 and the inner frame 30, a packing material 23 is mounted on the upper surface of the flange portion 25 b of the inner frame 30.

  As shown in FIG. 2, in the closed state of the inner frame 30, flange portions 25 b that extend outward from the three sides of the opening / closing side of the inner frame 30 are extended inward of the three sides of the opening / closing side of the outer frame 20. The flange portion 25b that is overlapped with the lower surface of the flange portion 25b that extends and extends outward on one side of the base end side of the inner frame 30 is replaced with the flange portion that extends inward of one side of the base end side of the outer frame 20 By overlapping on the upper surface of 25b, airtightness can be given by the packing material 23 interposed in the overlapping portion.

  In addition, in order to ensure the closed state of the inner frame 30, the lock 6 is provided. The lock 6 protrudes perpendicularly to the operation shaft and a bearing member that is erected above the flange portion 25b of the inner frame 30 on the rotation free end side, and an operation shaft that is rotatably inserted into the bearing member. And a lock piece. The lower end surface of the operation shaft is exposed on the lower surface of the flange portion 25b, and can be locked by rotating the operation shaft with a driver or the like and engaging the lock piece with the upper surface of the flange portion 25b of the outer frame 20. .

  The heat insulating lid 10 is a block body integrally formed in a square shape with, for example, a foamed polystyrene resin. A knob recess 11 is formed on the lower surface of the heat insulating cover 10 so that the heat insulating cover 10 can be easily inserted and removed (see FIGS. 4, 12, and 13).

  The heat insulating frame 15 is integrally formed of, for example, a foamed polystyrene resin, and is formed in a square shape so as to surround the heat insulating lid 10. In this case, as shown in FIGS. 1-3, in this embodiment, it can open and close centering on the axial part 30a of the inner frame 30 via the rotation member 8 interposed by the base end part of the outer frame 20. As shown in FIG. Is formed. In order to take the distance from the base end part of the inner frame 30 to the shaft part 30a, the width of the heat insulating frame 15 is formed thicker on one side of the closing side than on the three sides on the opening and closing side. Further, since the inner frame 30 rotates about the shaft portion 30a and the base end side rotates upward when opened, a space 18 is provided at the bottom of the heat insulating frame 15 on the base end side. .

  In addition, as shown in FIG. 7, a retaining metal fitting 16 is installed at each corner portion at the upper part of the inner surface of the heat insulating frame 15. The retainer prevention metal fitting 16 prevents the heat insulating lid 10 from being pulled out from the heat insulating frame 15 and can securely improve the airtightness and heat insulating property because the heat insulating frame 15 and the heat insulating lid 10 are securely adhered. The retaining bracket 16 is provided with a trapezoidal horizontal piece 16a, a pair of leg pieces 16b bent orthogonally from both ends of the horizontal piece 16a, and projecting downward from both ends of the lower sides of both leg pieces 16b. The triangular claw 16c at both ends is inserted into the adjacent inner peripheral surface of the heat insulating frame 15 and attached.

  As shown in FIGS. 2, 3, and 5 (a) to 5 (d), the heat insulating lid fall prevention device 40 (hereinafter referred to as the fall prevention device 40) is placed on a vertical piece 25 a of the outer frame 20 via a rivet 43. It is formed by an L-shaped metal fitting made up of a rectangular fixed piece 41 pivotally supported in a vertical direction and a rectangular holding piece 42 bent orthogonally from the end of the fixed piece 41. The fixed piece 41 is formed to be switchable between a vertical posture and a horizontal posture. The fall prevention device 40 is attached to four locations on the rotation base end side and the free end side of the inner frame 30 in the two-side outer frame 20 having the bearing 9 a of the rotation member 8.

  The fixed piece 41 is formed so that the contact surface 41b formed at the lower end portion of the fixed piece 41 is in contact with the flange portion 25b on the inner side of the outer frame 20 when taking the vertical posture, and one of the contact surfaces 41b A notch 41c is provided at the corner. The fixing piece 41 can be tilted only in the direction in which the notch 41c is provided (see FIGS. 2 and 3).

  The presser piece 42 has a locking surface 42a formed in a convex arc shape on the upper surface (FIGS. 3 and 5A to 5D). By forming in this way, it can suppress that the side surface of the holding piece 42 and the lower surface of the heat insulation lid | cover 10 are hooked, and it becomes easy to switch from a vertical attitude | position at the time of removing the heat insulation lid | cover 10 to a horizontal attitude | position.

  As shown in FIG. 8, the fixture 50 is erected in a direction perpendicular to the flat base portion 50 a and the opposite sides of the base portion 50 a, and the tips projecting in a C shape are triangular and A sharp fixed claw 50b is provided. A mounting hole 50c for screwing and fixing to the ceiling base beam 5 is formed in the base 50a.

  Below, the assembly procedure of the ceiling inspection port 1 is demonstrated with reference to FIGS. First, as shown in FIG. 10, the heat insulating frame 15 into which the retaining bracket 16 and the fixture 50 are inserted is attached to the ceiling opening 3. In this case, as shown in FIG. 9, a screw 55 having a countersunk head that is a fixing member that penetrates the mounting hole 50c formed in the base portion 50a of the fixing tool 50 inserted into the heat insulating frame 15 is attached to the ceiling base girder. The heat insulating frame 15 is fixed to the ceiling base girder 5 by screwing onto the inner surface of the material 5. As shown in FIG. 9, the triangular fixed claw 50b is inserted into the heat insulating frame 15 up to the base, the surface of the base 50a is in close contact with the outer wall surface of the heat insulating frame 15, and the back surface is a ceiling base beam 5 is in close contact with the inner surface. Even if the force which pushes up the heat insulation frame 15 more than necessary acts by comprising as mentioned above, since the fixed nail | claw 50b is protrudingly provided in the C shape, it is strong in a deformation | transformation, and the heat insulation frame 15 and a ceiling base beam Since a gap is not easily generated between the materials 5, the airtightness and heat insulation of the living space can be improved.

  Next, as shown in FIG. 11 and FIG. 12, the vertical piece of the outer frame 20 with the outer frame 20 to which the fall prevention device 40 and the fixed base 9 are attached inserted into the opening peripheral edge of the ceiling opening 3. A fixing screw 27 penetrating 25a is screwed to the ceiling base beam 5 to fix the outer frame 20. After fixing the outer frame 20, the inner frame 30 is inserted into the outer frame 20 from the notch portion, and the shaft portion 30 a protruding from the vertical piece 25 a of the inner frame 30 is fixed to the outer frame 20. The inner frame 30 is attached to the outer frame 20 so as to be openable and closable by being fitted so as to drop from the upper opening of the bearing 9 a of the base 9.

  Next, as shown in FIGS. 12 and 13, the heat insulating lid 10 is inserted into the heat insulating frame 15. At this time, it is confirmed whether the postures of the four fall prevention devices 40 attached to the outer frame 20 are horizontal postures.

  As shown in FIG. 5C, the holding piece 42 on the base end side is locked to the engaging portion 9b of the rotating member 8 when the fall prevention device 40 is in the horizontal posture. On the other hand, as shown in FIG. 5 (d), the holding piece 42 on the rotation free end side has a frame member 25 in which the fixed piece 41 is axially fixed by a rivet 43 when the fall prevention device 40 is in a horizontal posture. The locking surface 42a of the presser piece 42 is close to the vertical piece 25a of the frame member 25 orthogonal to the parallel piece 25 in parallel.

  As shown in FIG. 13, after inserting the heat insulation lid | cover 10, the fall prevention tool 40 is rotated and it switches to a vertical attitude | position. By setting the fall prevention tool 40 in a vertical posture, the presser piece 42 abuts on the lower surface of the heat insulation lid 10 to support the heat insulation lid 10 and prevent the fall.

  As described above, the fixed piece 41 is formed such that the contact surface 41b formed at the lower end is in contact with the flange portion 25b on the inner side of the outer frame 20, and the notch 41c is formed at one corner of the contact surface 41b. Therefore, the fixing piece 41 can fall only in the direction in which the notch 41c is provided, and does not rotate backward.

  Finally, the rotation free end side of the inner frame 30 is lifted upward to close the opening and locked by the lock 6. Thereby, the closed state of the inner frame 30 and the cover material 31 can be ensured.

  When inspecting the back of the ceiling from the ceiling inspection port 1 configured as described above, the worker releases the lock by the lock 6 and moves the rotation free end side of the inner frame 30 to which the lid member 31 is attached. Open downward. When the inner frame 30 is opened, the fall prevention tool 40 takes a vertical posture, and the presser piece 42 contacts the lower surface of the heat insulation lid 10 to prevent the heat insulation lid 10 from falling. It does not fall and can ensure the safety of workers.

  Next, while pressing the lower surface of the heat insulating lid 10, the worker switches the fall prevention tool 40 in the vertical posture to the horizontal posture by tilting it to the respective end side. If a total of four fall prevention devices 40 are placed in a horizontal posture, the presser piece 42 is insulated in parallel with the frame member 25 orthogonal to the frame member 25 of the outer frame 20 on which the fixed piece 41 is fixed. Since the space for the lid 10 to pass through the outer frame 20 can be secured, the heat insulating lid 10 can be removed indoors.

  The worker can inspect the back of the ceiling from the opening of the outer frame 20, but the four fall prevention devices 40 maintain the horizontal posture so that the outer frame 20 and the opened inner frame 30 Since it is stored along the edge, it does not hinder the work space of the worker.

  The worker who has finished the inspection of the back of the ceiling inserts the heat insulating lid 10 in the same manner as the mounting method described above, and closes the inner frame 30 to complete the inspection. At this time, it may be assumed that the worker forgets the work of switching the fall prevention device 40 on the base end side from the horizontal posture to the vertical posture. In this case, when the inner frame 30 is opened again, there is nothing to support the base end side of the heat insulating lid 10, and there is a risk that the heat insulating lid 10 will fall with opening. Therefore, the presser piece 42 of the fall prevention device 40 that is in a horizontal posture when the inner frame 30 is opened is engaged with the inner frame 30 when the inner frame 30 to which the lid 31 is attached is closed. Is not shorter than the distance from the fixed piece 41 to the inner frame 30. By configuring as described above, as shown in FIGS. 6A and 6B, the fall prevention device 40 in the horizontal posture can be switched to the vertical posture in conjunction with the closing operation of the inner frame 30. . Therefore, when the inner frame 30 is closed, the heat insulating lid 10 falls when the inner frame 30 is opened again even if the fall prevention device 40 is forgotten to switch from the horizontal posture to the vertical posture. Therefore, the safety of workers can be ensured.

  In the above-described embodiment, the heat insulating frame 15 is provided so as to surround the heat insulating lid 10, and the case where the retaining metal fitting 16 is inserted into the upper corner portion of the heat insulating frame 15 has been described. As long as it can be prevented from being pulled out from 15, the structure may be different.

  For example, as shown in FIG. 16, the heat insulating frame 15 </ b> A provided so as to surround the heat insulating lid 10 is formed of, for example, a foamed polystyrene resin, and has an inward flange portion facing inward at the upper end portion of the inner peripheral surface thereof. 17 is integrally formed. Since the lower surface of the inner flange portion 17 and the upper surface of the inserted heat insulating lid 10 are locked, the heat insulating lid 10 can be prevented from being pulled out from the heat insulating frame 15A. In FIG. 16, the other parts are the same as those in the above-described embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

  In addition, the heat insulating frame 15A can be variously formed by stacking square frame members in accordance with the thickness of the heat insulating lid 10 and forming the heat insulating frame 15A by stacking frame members having the inner flange portions 17 on the uppermost layer. It is possible to correspond to a heat insulating lid 10 having a large thickness. Further, since the heat insulating frame 15 is made of a foamed polystyrene resin that can be easily cut off, only a frame member having the inner flange portion 17 is prepared, and the inner flange portion 17 is cut out in accordance with the height of the heat insulating lid. The required number of frame members can be prepared, and the frame member having the inner flange portion 17 can be stacked on the uppermost layer to form the heat insulating frame 15A.

DESCRIPTION OF SYMBOLS 1 Ceiling inspection port 2 Ceiling surface 3 Ceiling opening 5 Ceiling base girder 8 Rotating member 10 Heat insulation lid 15 Heat insulation frame 20 Outer frame 30 Inner frame 31 Cover material 40 Thermal insulation lid fall prevention tool 41 Fixing piece 42 Pressing piece 50 Fixing tool 50a Base 50b Fixing claw 55 Screw (fixing member)

Claims (3)

It is formed to be openable and closable via a rectangular outer frame that is fitted and fixed in a ceiling opening established on the ceiling surface, and a rotating member that is interposed between two opposite sides of the outer frame, and has a lid inside An inner frame provided with a material, a rectangular heat insulating frame disposed above the outer frame and fixed to a ceiling base girder, and an insertable and removable arrangement in the openings of the outer frame and the heat insulating frame A ceiling inspection opening comprising a heat insulating lid,
The outer frame is at least opposed to a heat-insulating lid fall prevention device comprising a fixed piece pivotally supported so as to be pivotable in the vertical direction and a presser piece bent orthogonally from an end of the fixed piece. Attached to two sides,
The heat insulating lid fall prevention device is formed to be switchable between a vertical posture in which the fixed piece is vertical and a horizontal posture in which the fixing piece is horizontal,
In the vertical posture, the presser piece abuts the lower surface of the heat insulating lid to prevent the heat insulating lid from falling, and in the horizontal posture, the presser piece is fixed to the outer frame on which the fixed piece is pivoted. By approaching in parallel with the side orthogonal to the side, the heat insulating lid is inserted and formed to be removable.
Ceiling inspection opening characterized by that. In the ceiling inspection port according to claim 1,
The heat insulating frame is formed of a foam heat insulating resin material, and fixed to the ceiling base girder by a fixture,
The fixture includes a flat base and a fixed claw that is raised in a direction orthogonal to the opposite sides of the base, and has sharpened tips that project from each other in a C shape,
The fixing claw is inserted into the outer side surface of the heat insulation frame, and the base and the ceiling base beam are fixed by a fixing member.
Ceiling inspection opening characterized by that. In the ceiling inspection port according to claim 1 or 2,
When the inner frame is opened, the presser piece of the heat insulating lid fall prevention device in the horizontal posture is formed to be engageable with the inner frame when the inner frame is closed, and interlocked with the closing operation of the inner frame. Then, the heat insulating lid fall prevention device is formed to switch to the vertical posture,
Ceiling inspection opening characterized by that.

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