JPS62172137A - Ceiling ventilation port with fire-prevention damper - Google Patents

Abstract

PURPOSE:To enable a ceiling cap to be moved downwardly and further enable an amount of ventilation to be freely varied by a method wherein an outer frame is arranged along an opening in a ceiling, a cap having such a size as enabling a closing of the opening is arranged below the opening, an outer frame is provided with a female thread, and a male thread is screwed with the female thread part CONSTITUTION:A cap 4 having the such a size as capable of closing an opening 2 is arranged below the opening 2, a female thread 6 is arranged at a frame 5 installed between the outer frames 3 and at the same time a male thread part 8 of a supporting shaft 7 projected above the cap 4 is screwed wit the female thread part 6 to cause the cap part 4 to be moved up and down. Therefore, the opening 2 is closed by moving the cap part 4 in such a way as it may be abutted against the lower surface of the ceiling 1 so that any ventilation may not be performed and further the up and down positions of the cap part 4 can be adjusted so as to adjust a clearance between the opening 2 and the cap part 4, resulting in that an amount of ventilation can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to the structure of a ceiling ventilation opening having a fire damper that closes in the event of a fire.

[Background Art 1 A conventional ceiling ventilation opening with a fire damper was constructed as shown in Figure tpJ9. In other words, a hole b is provided in an opening a provided in the ceiling, a cylindrical outer frame C is attached along the opening a,
A fire damper d which can be opened and closed is placed inside the outer frame C and held by a temperature fuse C so that the fire damper d is folded. And usually as shown in Figure 10! ! ! f
<'6 The air that enters the room i from r or from the floor down enters the attic j through the opening a, and from the attic J to the roof ventilation hole (1)
Houses are now ventilated and ventilated so that air can go outside through the process.

Further, in the event of a fire, the temperature fuse C melts and the fire damper d expands to close the inside of the outer frame C. However, this prior art example 1 had a drawback in that the opening a was always open for ventilation even when ventilation was not required.

[Object of the Invention] The present invention has been made in view of the points stated above, and an object of the present invention is to close the opening so that ventilation is not performed when ventilation is not necessary, and to reduce the amount of ventilation. Freelance! To provide a ceiling ventilation opening with a fire prevention damper which can be closed with a fire prevention gun in the event of a fire, even if the opening can be closed or the ventilation amount can be adjusted so as not to ventilate.

[Disclosure 1 of the Invention] The ceiling ventilation opening with a fire damper of the present invention is provided with an outer frame 3 in an opening 2 provided in a ceiling 1 along the opening 2, and a long body 4 of a size that can close the opening 2. A female threaded portion 6 is provided on the frame 5 which is disposed below and installed in the outer frame 3, and the beneficial body 4
The male threaded portion 8 of the support shaft 7 that protrudes further upward is connected to the female threaded portion 6.
The lid body 4 is made vertically movable by screwing into the opening 2 in the outer frame 3.
A cylindrical fire damper 9 that can close the gap between the lid body 4 and the lid body 4 is disposed, and the fire damper 9 is supported on the outer frame 3 by a temperature fuse 10 that melts in the event of a major disaster and releases the support of the fire damper 9. By configuring as described above, the drawbacks of the conventional example are solved. In other words, a lid 4 large enough to close the opening 2 is disposed below the opening 2, a female threaded portion 6 is provided on the frame 5 installed between the outer frames 3, and a support shaft 7 is provided that protrudes upward from the body 4. Since the male screw part 8 is screwed into the female screw part 6 and the cover body 4 is made vertically movable, the opening 2 is closed by moving the cover body 4 so as to come into contact with the lower surface of the ceiling 1, so that ventilation is not performed. By adjusting the vertical position of the cover body 4, the gap between the opening 2 and the cover body 4 can be adjusted, and the amount of ventilation can be adjusted. A cylindrical fire damper 9 that can close the gap between the lid body 4 and the lid body 4 is arranged, and a temperature fuse 10 that melts and releases the support of the fire damper 9 in the event of a major disaster.
By supporting the fire damper 9 on the outer frame 3, the temperature fuse 10 melts in the event of a fire, and the fire damper 9 falls from the outer frame 3 and is blocked to prevent ventilation, thereby providing fire prevention. It has become.

The present invention will be explained in detail below with reference to Examples.

First, the embodiment shown in FIGS. 1 and 2 will be described.

An opening 2 is provided in the ceiling 1, and an outer frame 3 is attached to the opening 2 along the entire circumference of the opening 2 on the back side of the ceiling. A frame 5 is installed between the upper portions t1 of the outer frame 3, and a female screw portion 6 is provided at the center of the seven frames 5. The thread of this female thread portion 6 is a square thread.

A body 4 having a diameter larger than that of the opening 2 is arranged below the opening 2, and the lower end of a support shaft 7 facing in the vertical direction is fixed to the center of the lid body 4 with a screwdriver 1. A male screw portion 8 made of a square screw is provided on the upper outer periphery of the support shaft 7. Male thread part 8
is screwed into the above-mentioned screw portion 6, and by rotating the lid 1, the lid 4 can be moved up and down.

A stopper 12 is provided at the upper end of the support shaft 7 to prevent the support shaft 7 from coming off from the female threaded portion 6.

The height H between the lower surface of the ceiling 1 and the upper surface of the lid 4 when the lid 4 is lowered the most is equal to the threading distance of the male threaded portion 8. A cylindrical fire damper 9 is arranged along the inner periphery of the outer frame 3, and a connecting portion 13 extends from the outer frame 3 and a connecting portion 14 extends from the fire damper 9. and are connected at a temperature ratio of 7:10. This temperature cutter: X10 melts and is cut when it reaches a predetermined temperature.

In this embodiment, the opening 2 is circular, the outer frame 2 and the fire damper 9 are cylindrical, and the benefit body 4 is disc-shaped, but the opening 2 may be square. When the opening 2 is square, the outer frame 3 and the fire damper 9 have a square tube shape, and the utility body 4 has a square plate shape. Further, the ceiling 1 and the benefit structure 4 are made of fireproof material. In this way, a ceiling ventilation hole with a fire damper is formed, and the lid body 4 is normally located below the opening 2.
Indoor air flows through the opening 2 from the gap between the FL and the ceiling 1 to the attic, and ventilation and ventilation of the FL room is performed.

At this time, by rotating the benefit body 4 and screwing the male threaded part 8 into the female thread part 6, the benefit body 4 is raised and lowered, and the ceiling 1
The amount of ventilation can be adjusted by changing the gap between the lid body 4 and the lid body 4. When ventilation is not required, the six bodies 4 are moved to the uppermost position S, and the lid body 4 is brought into contact with the lower surface of the ceiling 1 to close the opening 2.

Furthermore, if a fire occurs while ventilation is in place, the temperature fuse 10 will melt and break due to the flames A and heat of the fire, and the fire protection gun bar 9 will fall under its own weight, causing the opening 2 to open as shown in Figure 2.
The gap between and the ceiling 1 is closed.

Next, the embodiments shown in FIGS. 3, 4, and 5 will be described. 7. A rod 15 is suspended downward from the yIJ portion on the outer circumferential side of the frame 5, and the rod 15 is inserted into a through hole 17 provided in an upper flange portion 16 provided around the inner circumference of the fire prevention gun bar 9 so as to protrude from the inner circumference.
5 is inserted through it so that it can move up and down. A bulge 18 is provided at the lower end of the a.nd 15, and when the fire prevention gunper 9 is lowered, the bulge 18 does not pass through the through hole 17 and is engaged with the upper flange 16. There is. A compression spring 19 is wound around the outer circumference of the rod 15, and 7 frames 5
A compression spring 19 is interposed between the upper flange 16 and the upper flange 16, and the single compression spring biases the fire prevention gun bar 9 to descend. The fire prevention gun 9 is pushed upward against the compression spring 19, and in this state, the through hole 17 and the opening/door 15 are fixed with the temperature fuse 10. In this embodiment as well, ventilation is carried out in the same manner as in the embodiments shown in FIGS. 1 and 2. Now, if a fire breaks out, the temperature fuse 10 will melt and be cut due to the flame A and the temperature.
The compression spring 19 is expanded and the fire prevention gunper 9 is lowered to close the gap between the opening 2 and the lid 4 as shown in FIG.

Next, the embodiments shown in FIGS. 6, 7, and 8 will be described. A tension spring 20 wound around the outer circumference of the rod 15
is installed between the upper flange part 16 and the enlarged part 18, and urges the fire prevention gunper 9 downward so that the fire prevention gunper 9 descends. In this embodiment, the connecting body 22 attached to the frame 5 and the connecting body 23 attached to the upper flange 1) 16 are connected by a temperature fuse 10.
It is ventilated similarly to that of the embodiment shown in FIG. When a fire breaks out, the temperature fuse 10 is melted and cut by the flame A and temperature, the tension spring 20 is contracted, the fire prevention gunper 9 is lowered, and the gap between the opening 2 and the ceiling 1 is closed.

[Effects of the Invention] As described above, the present invention provides an outer frame along the opening in the ceiling, places a lid body large enough to close the opening below the opening, and connects the upper part of the outer frame. A female thread was provided on the 7 frames installed on the top of the frame, and the male thread of the support shaft protruding above the lid was screwed into the female thread to allow the lid to move up and down. The lid can be moved up and down by screwing the male threaded part onto the female threaded part, and the opening can be closed with a trowel by placing the upper flange of the lid in contact with the lower surface of the ceiling. It can be closed off to prevent ventilation when ventilation is not required.
However, by raising and lowering the lid, the opening gap between the ceiling and the lid can be changed, and the amount of ventilation can be changed freely. A cylindrical fire prevention gunbar that can close the gap between the two is placed, and the fire prevention gunpa is supported on the outer frame by a temperature fuse that melts in the event of a man-made disaster and releases the support of the fire prevention gunbar, so the temperature fuse will not melt in the event of a fire. It is a device that is moved away from the outer frame and moved down to close the gap between the opening and the ceiling, making it possible to prevent fire without ventilation, and it is possible to stop ventilation or adjust the amount of ventilation. It can also be used for fire protection, and even if you install a guard gun, it can be used as a fire prevention device.

[Brief explanation of drawings]

Figures 1 (a) and (b) are a cross-sectional view and a plan view of one embodiment of the present invention, Figure 12 is a cross-sectional view of the above-mentioned guard gunbar in an activated state, and Figure 3 is a cross-section of another embodiment of the same. Figure 4 is a sectional view of the above fire prevention goomba in an activated state, Figure 5 is an enlarged sectional view of the main parts of the above, Figure 6 is a sectional view of the embodiment of the same pond, and Figure 7 is a sectional view of the above fire prevention gunper in an activated state, Fig. 8 is an enlarged sectional view of the main parts of the above, Fig. trS9 is a schematic sectional view of the conventional example, and Fig. 10 is an explanatory diagram showing the ventilation state of the house. 1 is the ceiling, 2 is the opening, 3 is the outer frame, 4 is the lid, 5 is the 7 frame, 6 is the female threaded part, 7 is the support shaft, 8 is the male threaded part, 9 is the fire damper, 10
is the temperature fuse. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 (a) Figure 2 Figure 5 Figure 6 Figure 8

Claims (1)

[Claims] [1] An outer frame is provided along the opening in the ceiling, a lid body large enough to close the opening is placed below the opening, and a frame installed between the outer frames is provided with an outer frame along the opening. A female threaded portion is provided, and a male threaded portion of a support shaft protruding upward from the lid body is screwed into the female threaded portion so that the lid body can move up and down, and the gap between the opening and the lid body is closed within the outer frame. A ceiling ventilation opening with a fire prevention damper, characterized in that a cylindrical fire prevention damper is arranged, and the fire prevention damper is supported on an outer frame by a thermal fuse that melts and releases the support of the fire prevention damper in the event of a major disaster. [2] The ceiling ventilation opening with a fireproof damper according to claim 1, wherein the fireproof damper falls under its own weight when the thermal fuse is cut by melting. [3] The ceiling ventilation opening with a fireproof damper according to claim 1, wherein the fireproof damper is caused to fall by the spring force of a compression spring when the thermal fuse is cut by melting. [4] The ceiling ventilation opening with a fireproof damper according to claim 1, wherein the fireproof damper is caused to fall by the spring force of a tension spring when the thermal fuse is cut by melting.