JP3107717B2 - Ceiling access door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling inspection port provided on a ceiling of a house or the like for inspecting a space above a ceiling.

[0002]

2. Description of the Related Art Conventionally, a ceiling inspection opening is generally considered only as a function as an entrance and exit for inspection into the ceiling and ease of opening and closing, and also in a case where heat insulation is considered in a cold region, etc. A ceiling inspection port in which a simple wooden box filled with glass wool or the like is disposed on the upper surface of the ceiling inspection port is mainly used.

[0003] However, all of these conventional ceiling inspection ports have insufficient heat insulating properties, and the glass wool layer has many gaps and is poor in airtightness.

On the other hand, indoor air generally has a high temperature and a lot of moisture relative to the cool air behind the ceiling, so that when the ceiling inspection port is poor in airtightness, the humidity of the air through the ceiling inspection port is low. There is a problem that a large amount of room air infiltrates into the ceiling and the moisture causes corrosion damage or deterioration of the glass wool and other heat insulating members laid all over the ceiling structure and the ceiling. Further, for example, when a negative pressure is generated in the room due to forced ventilation or the like, on the contrary, cool air behind the ceiling infiltrates into the room, and there is a disadvantage that the room temperature is lowered.

[0005] Further, the wooden box filled with glass wool requires a considerable thickness of the glass wool layer in order to improve the heat insulating effect. There was also a problem that the work of mounting and inspecting the ceiling inspection opening was not easy.

[0006]

SUMMARY OF THE INVENTION In view of the above situation, the present invention has excellent heat insulating properties and high airtightness, and is capable of penetrating indoor air into the back of the ceiling and allowing cool air behind the ceiling to enter the room. It is an object of the present invention to provide a ceiling inspection port that can be prevented as much as possible and that is lightweight and easy to install and inspect the ceiling inspection port.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a weir plate is erected on the upper part of the periphery of an opening provided in a ceiling plate, and the tubular frame is formed inside the tubular frame formed by the weir plate. A closed-cell synthetic resin foam molded article having a horizontal cross-sectional shape substantially similar to the horizontal cross-sectional shape of the internal space is fitted inside the cylindrical frame in a state of being fitted inside the box form, A flange is attached to the inner peripheral edge of the upper part of the cylindrical frame, and the flange and the upper end of the side wall of the box form are air-tightly joined, and a flange attached to the outside of the bottom of the box form has a flange. A ceiling inspection port which is detachably fixed to a periphery of an opening.

As the box frame, a frame formed by attaching a decorative plate for an inspection port to the bottom of a cylindrical body made of a synthetic resin and having open upper and lower surfaces and side walls is preferably used.

[0009]

The ceiling inspection port of the present invention is a horizontal cross section of the internal space of the cylindrical frame formed inside a cylindrical frame constituted by a weir plate erected above the peripheral edge of the opening provided in the ceiling plate. Conventionally used, since a closed-cell synthetic resin foam molded article having a horizontal cross-sectional shape substantially similar to the shape is detachably fitted in a state of being inserted and fitted inside the box form. There is no gap between the glass wool layers such as the glass wool layer, which has excellent heat insulation properties. A flange is attached to the inner peripheral edge of the upper part of the cylindrical frame, and the flange and the upper end of the side wall of the box form are air-tightly joined. It has high airtightness because it is.

Further, since the main part is a synthetic resin foam molded article, it is lightweight.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a drawing showing a typical embodiment of the present invention, and shows a longitudinal sectional view of a ceiling inspection port.

FIG. 2 is a sectional view taken along the line AA in FIG.

As shown in these drawings, a weir plate 3a made of synthetic resin, wood or other suitable material is provided upright on the upper part of the periphery of the opening provided in the ceiling plate to constitute the cylindrical frame 3. Is done.

Generally, the opening has a quadrilateral shape, and the weir plate 3a is erected on four sides and is often formed as a cylindrical frame 3 having a quadrilateral horizontal cross section. And may be configured as a cylindrical frame.

One of the features of the present invention is that a synthetic resin foam molded article 1 having a horizontal sectional shape substantially similar to the horizontal sectional shape of the internal space of the cylindrical frame 3 is inserted into the box form. In this manner, it is detachably fitted into the internal space of the cylindrical frame 3 in an aspect. The synthetic resin foam molded article 1 is required to be a closed-cell foam molded article in order to ensure heat insulation and airtightness.

In general, closed-cell foamed molded articles such as expanded polystyrene and polyurethane foam are most preferably used, but closed-cell foamed molded articles of polyethylene, phenolic resin, vinyl chloride resin and other synthetic resins are also suitably used. Can be adopted.

The synthetic resin foam molded article 1 has a horizontal cross-sectional shape substantially similar to the horizontal cross-sectional shape of the internal space of the cylindrical frame 3, and is removably fitted into the cylindrical frame 3. That is, in a mode in which the synthetic resin foam molded article 1 having a horizontal cross-sectional shape that is substantially the same as the horizontal cross-sectional shape of the internal space of the cylindrical frame 3 and is slightly smaller is inserted into the inside of the box form. The cylindrical frame 3 is fitted to the inside of the cylindrical frame 3.
And the gap between the two and the synthetic resin foam molded article 1 are reduced,
The opening of the ceiling inspection opening is substantially a synthetic resin foam molded article 1
As a result, excellent heat insulation and airtightness are secured.

The thickness of the synthetic resin foam molded article 1 is as follows:
It is appropriately determined according to the desired degree of heat insulation and the like,
Usually, a thickness of about 10 to 30 cm is sufficient.

Further, the synthetic resin foam molded article 1 is fitted inside the cylindrical frame 3 in such a manner as to be inserted into the box frame 2 while protecting the peripheral surface.

As a typical embodiment of the box form 2, a decorative plate 2 for an inspection port is provided on the bottom of a cylindrical body 2a having an open upper surface and a lower surface.
An example of a mode in which b is added is given. Even when the cylindrical body 2a having the open upper and lower surfaces is used, since the synthetic resin foam molded body 1 is used as the heat-insulating and airtight member, there is no possibility that the heat insulating property and airtightness are reduced. Because it is open, it is lighter in weight than a wooden box conventionally used to fill glass wool or the like.

The side wall constituting the cylindrical body 2a is preferably made of synthetic resin from the viewpoint of heat insulation.

In FIG. 1, a synthetic resin foam molded article 1 is shown.
Is provided with a bottom flange 2d on the inner periphery of the bottom of the cylindrical body 2a,
A sealing tape 8 is inserted between the bottom flange 2d and the synthetic resin foamed body 1 in order to further improve the airtightness. A caulking 7 for closing a gap with an inner wall surface of the tubular body 2a is provided on a peripheral edge of an upper surface of the synthetic resin foam molded body 1.

A decorative plate 2b for an inspection port is attached to the bottom of the cylindrical body 2a by screws (not shown in FIG. 1) on a bottom flange 2d.

The box frame 2 in which the synthetic resin foam molded body 1 is inserted is fitted into the cylindrical frame 3, and the box frame 2 is fixed by the box frame 2. This is accomplished by detachably fixing the flange 2c attached to the outside of the bottom to the periphery of the opening of the ceiling plate with screws 6 or the like. The flange 2
c may be formed integrally when forming the side wall with the same material as the side wall constituting the cylindrical body 2a, but in a mode in which a material different from the side wall, for example, a metal flange portion is provided. Is also good. Further, in order to improve the airtightness, a flange portion 4 made of a stopper is attached to an inner peripheral edge of an upper portion of the cylindrical frame 3, and a sealing packing is provided between the flange portion 4 and an upper end of a side wall of the box frame 2. It is preferable to apply an airtight material such as a sealing tape 8 between the flange portion 2c of the box form 2 and the ceiling plate.

In addition, on the back of the ceiling 10 other than the ceiling inspection door,
Insulation members such as glass wool are usually used as needed.
Be laid.

FIGS. 3 and 4 are views showing another embodiment of the present invention.

In FIG. 3, a weir plate 3a having a shape in which a bottom flange 2d of a side wall constituting a cylindrical body 2a of a box frame is cut out is used, and this is fixed to a field edge 5 to form a cylindrical frame. Is configured.

FIG. 4 shows an embodiment in which the weir plate 3a of the embodiment shown in FIG. 3 is further provided with an auxiliary weir plate 3b. Such a mode is, for example, when laying a large amount of glass wool on the back of the ceiling other than the ceiling inspection port, the height of the glass wool is relatively higher than the height of the box form 2 composed of the cylindrical body 2a. This is useful when a high cylindrical frame 3 is required.

[0030]

As described above, the present invention has excellent heat insulation and high airtightness. This not only contributes to energy saving during indoor cooling and heating, but also prevents infiltration of humid indoor air into the ceiling, effectively preventing corrosion damage and functional deterioration of ceiling structural materials and insulation materials such as glass wool in the ceiling. can do. In addition, it is possible to prevent cold air from entering the room from behind the ceiling when a negative pressure occurs in the room due to forced ventilation or the like, and it is also effective in terms of soundproofing. Furthermore, it has various advantages such as light weight and easy installation and inspection work of the ceiling inspection opening.

[Brief description of the drawings]

FIG. 1 is a drawing showing a typical embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a drawing showing another embodiment of the present invention.

FIG. 4 is a drawing showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foam molded product made of synthetic resin 2 Box form 2a Tubular body 2b Decorative plate for inspection opening 2c Flange part 2d Bottom flange part 3 Cylindrical frame 3a Weir plate 3b Auxiliary weir plate 4 Flange part 5 Field edge 6 Screw 7 Sealing packing 8 Sealing tape 9 Caulking 10 Attic

Claims (1)

(57) [Claims] 1. A weir plate is erected above a peripheral edge of an opening provided in a ceiling plate. A closed-cell synthetic resin foam molded article having a similar horizontal cross-sectional shape is fitted inside the cylindrical frame in a state of being inserted and fitted inside the box form, and the inside of the upper part of the cylindrical frame is formed. A flange is attached to the periphery, and the flange and the upper end of the side wall of the box form are hermetically joined, and a flange attached to the outside of the bottom of the box form is detachably fixed to the periphery of the opening of the ceiling plate. A ceiling inspection door characterized by being made.