JPH10337337A - Fireproof screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent diffusing flame and smoke on opening/closing a wide opening part with a fireproof sheet, by setting narrow fireproof sheets in between plural wide fireproof sheets capable of closing a wide opening part and always energizing the narrow fireproof sheets in the winding direction by a coil spring. SOLUTION: When a wide opening part between partitions of a building is to be closed with fireproof sheets 5 (5a, 5b), 6a, a braking mechanism of a shutter is loosened to descend a seat plate 15 and fireproof sheets 5, 6a by self weight. Since two long shaft 7a, 7b are coaxially connected by a coupling 8, wide fireproof sheets 5a, 5b are descended matching each other. On the other hand, force is stored in a built-in coil spring by rotation of an outer cylinder part of a short shaft 9 accompanying the descending of the narrow fireproof sheet 6a and the force is applied to the fireproof sheet 6a in the winding direction during descending stretched without loosening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for preventing a fire from spreading and a smoke from being spread by closing a wide opening between sections of a building (such as between rooms) when a fire occurs. The present invention relates to a fire screen, and more particularly, to a fire screen structure in which a plurality of screens are connected to close the entire wide opening.

[0002]

2. Description of the Related Art Generally, in buildings such as buildings,
In the event of a fire, if the surroundings of the flame are fast, damage will increase, and if building materials such as ceiling materials are burned, toxic gas may be generated. Toxic gases can spread damage even at slow speeds. Therefore, a method is adopted in which a fire protection screen is installed on a building and the fire prevention screen is used to close any space between the fire compartment and the non-fire compartment to prevent the spread of flame and the inflow of smoke due to a fire. Have been.

[0003] If the width of such a fireproof screen is made too wide, the shaft used to wind up the refractory sheet is bent, so that the width is generally about 8 m at most. . Therefore, in order to close the opening wider than the horizontal width, it is necessary to connect a plurality of fire protection screens so as to cover the entire opening. Here, simply connecting a plurality of fire protection screens and lowering the fire protection sheet of each fire protection screen in the event of a fire so as to close the wide opening will result in a gap between the fire protection sheets, Smoke leaks from this gap. That is, if the fire-resistant sheet is lowered at the time of a fire, a large pressure is applied to the fire-resistant sheet due to the fire wind, and this pressure may cause the flame or smoke to leak from the gap between the fire-resistant sheets. There is a problem that it is not possible to prevent the diffusion of

[0004]

As described above, in order to close the wide opening in the event of a fire, a plurality of fire screens are connected to cover the entire wide opening. Flames and smoke may leak out from the gap between the sheets, and a problem has arisen that the spread of damage cannot be prevented. The present invention has been made to solve such a conventional problem,
It is an object of the present invention to provide a fire prevention screen that can reliably prevent diffusion of flame and smoke even when a plurality of fireproof sheets are connected to each other at a wide opening and the whole is closed.

[0005]

In order to achieve the above object, the invention described in claim 1 of the present application is to prevent fire and smoke from spreading by closing a wide opening of a building or the like when a fire occurs. , A plurality of long shafts arranged along the width direction of the ceiling portion of the wide opening, driving means for reversibly driving each of the long shafts, and each of the long shafts being wound around each of the long shafts A wide refractory sheet that moves up and down with the rotation of the long shaft to open and close the wide opening and closes a connection portion between the long shafts and a coil spring is disposed inside. It is characterized in that it has a short shaft that is constantly biased by the biasing force of the coil spring and a narrow width fire-resistant sheet that is wound around the short shaft.

According to a second aspect of the present invention, the short shaft is disposed on the front side and the back side of the long shaft connecting portion, and the narrow fireproof sheet wound around the short shaft is connected to the wide sheet connecting portion. It is characterized in that it is overlapped on the front side and the back side of the part. The invention according to claim 3 is characterized in that the long shafts are connected by couplings, respectively, and are driven to rotate in conjunction with one drive means.

According to the present invention constructed as described above, when a plurality of long shafts and a wide refractory sheet wound therearound are connected to close a wide opening, a gap generated between the wide refractory sheets. Therefore, even if a strong pressure is applied to the refractory sheet at the time of a fire, the spread of fire and the diffusion of smoke can be reliably prevented. Further, a coil spring is arranged inside the short shaft, and the narrow refractory sheet is urged to wind up by the urging force of the coil spring. When the wide refractory sheet is rolled up by the rotational driving force of the driving means when it is lowered and raised in conjunction with the lowering, it is wound up by the urging force of the coil spring. Therefore, the narrow refractory sheet is constantly applied with a constant tension by the urging force of the coil spring, and can be expanded without slack. Further, a driving force for winding the narrow refractory sheet is prepared. There is no need to perform this, and the configuration can be simplified.

In addition, if the narrow fire-resistant sheet is arranged on both the front side and the back side of the connection portion of the wide fire-resistant sheet, the gap between the wide fire-resistant sheets can be more tightly covered. become able to. Furthermore, if a plurality of long shafts are connected by a coupling, each long shaft can be driven in conjunction with one driving means.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are explanatory views showing the configuration of an embodiment of a fire protection screen to which the present invention is applied. FIG. 1 is a front view, and FIG. 2 is a side view. In this fireproof screen, the wide opening portion surrounded by the lintel 1, the guide rails 2, 3 and the floor 4 has two wide fireproof sheets 5 (5a, 5b) and one narrow fireproof sheet 6 ( 6a, 6b) to release and close.

As shown in FIG. 1, a lintel 1 serving as a swallowing opening for each of the refractory sheets 5 and 6 is disposed at a ceiling portion of the wide opening, and a wide fire proof is provided above the lintel 1. A long shaft 7 (7) for winding the sheets 5a and 5b
a, 7b) are arranged, and the long shafts 7a, 7b are coaxially connected by a coupling 8. Further, as shown in FIG. 2, a short shaft 9 (9
a, 9b) are installed, and this short shaft 9a,
Narrow-width fire-resistant sheets 6a and 6b are wound around 9b. Then, as described later, the short shaft 9a,
9b is always urged by a spring (coil spring) 10 in a winding tendency. In addition, each refractory sheet 5a,
At the lower ends of 5b, 6a and 6b, seat plates 15 are provided which are arranged over the entire width of the wide opening.

A sprocket 11 is attached to one end of the long shaft 7b. The sprocket 11 is connected to an output shaft 13 of a switch 12 as a driving means and a chain 14.
(See FIG. 2). The switchgear 12 has a driving motor and a brake mechanism (not shown) therein, and uses the driving force of the motor when rotating the long shafts 7a and 7b to wind up the wide refractory sheet 5,
On the contrary, when the seat is lowered, the brake mechanism is released and the seat is lowered by its own weight.

FIG. 3 is a perspective view showing the structure of the short shaft 9, and FIG. 4 is a cross-sectional view of the short shaft 9. As shown in FIG.
0 is built-in, and is rotationally biased in a certain direction. That is, as shown in FIG. 4, the short shaft 9 has an outer cylindrical portion 16 and an inner shaft 17 disposed inside the outer cylindrical portion 16, and one end of the outer cylindrical portion 16 has a rotating shaft 18. , And one end of the inner shaft 17 is connected to a fixed shaft 19. As shown in FIG. 3, the rotating shaft 18 is supported by a rotating bracket 24, and the fixed shaft 19 is supported by a fixed bracket 25.

A helical spring 10 is disposed around the inner shaft 17.
Is fixed to the inner shaft 17 by a fixing pin 20. Further, the other end of the spring 10 is
The cylindrical body 22 is fixed to the outer cylindrical portion 16. One end of the inner shaft 17 is supported by a bearing 23 inside the cylindrical body 22. Therefore, when the outer tubular portion 16 rotates with the lowering of the narrow width fire-resistant sheet 6, the outer tubular portion 16 is urged in the winding direction by the urging force of the spring 10.

Next, the operation of the present embodiment configured as described above will be described. Now, when a wide opening such as a section between buildings is closed with a fireproof sheet, the switch 12
By operating the brake mechanism, the refractory sheets 5, 6 can be lowered by the weight of the seat plate 15 and the respective refractory sheets 5, 6. Then, when the seat plate 15 comes into contact with the floor 4, the brake mechanism is operated by detecting a limit switch (not shown), and the long shafts 7a, 7
The rotation of b is stopped, and the lowering of the refractory sheets 5 and 6 is stopped.

At this time, since the two long shafts 7a and 7b are coaxially connected by the coupling 8, the wide refractory sheets 5a and 5b are lowered in step with each other, and with a constant tension. It will be expanded without slack. On the other hand, in the narrow width fire-resistant sheets 6a and 6b, the outer cylindrical portion 16 shown in FIG. 4 rotates as the sheets descend, and at this time, the inner shaft 17 is fixed via the fixed shaft 19 to the fixed bracket 25. , The inner shaft 17 does not rotate as the seat descends. That is, since the spring 10 rotates, the urging force in the winding direction acts on the spring 10 as the sheet descends. Therefore, when the narrow width fire-resistant sheet 6 is lowered by the weight of the seat plate 15, a constant force is applied to the narrow width fire-resistant sheet 6 in the winding tendency by the urging force of the spring 10. The refractory sheet 6 is stretched with a constant tension without loosening.

Further, when the fireproof sheets 5 and 6 are wound up to release the wide opening, the motor of the switchgear 12 is driven so that the output shaft 13 of the switchgear 12 and the sprocket 1
1 and the long shaft 7b connected by the chain 14 rotates in the winding direction, which means that the long shaft 7a connected by the coupling 8 is also driven to rotate. The refractory sheets 5a and 5b are wound up. As a result, the seat plate 15 is lifted, so that no downward force is applied to the narrow width fireproof sheets 6a, 6b, and the narrow width fireproof sheets 6a, 6b are wound around the short shafts 9a, 9b by the urging force of the spring 10.

Thus, when the refractory sheets 5 and 6 are lowered to close the wide opening, the refractory sheets 5 and 6 are stretched with a certain tension without being loosened. When the sheets 5 and 6 are wound, the narrow fire-resistant sheets 6a and 6b are wound by the urging force of the spring 10 as the wide fire-resistant sheets 5a and 5b rise.

As described above, in the fire protection screen of the present embodiment, the wide opening is closed by using the two wide fire-resistant sheets 5a and 5b, and furthermore, the connection part of each wide fire-resistant sheet 5a and 5b is provided. Since the narrow width fire-resistant sheets 6a and 6b are arranged on the front side and the back side in the gap portion, the gap in this portion can be covered. Further, since the two long shafts 7a and 7b are connected by the coupling 8, they can be rotated in synchronization with each other.
The wide refractory sheets 5a and 5b can be spread without loosening. Further, since the narrow width fire-resistant sheets 6a and 6b are urged to take up by the urging force of the spring 10, the fire-resistant sheets 6a and 6b are similarly expanded with a constant tension without being loosened. As a result, the wide opening can be reliably closed, and even when pressure due to a fire wind is applied, it is possible to reliably prevent the spread of flame and the diffusion of smoke.

In the above embodiment, the example in which the wide opening is closed by using the two wide refractory sheets 5a and 5b is described. However, the present invention is not limited to this. The number of sheets can be appropriately determined according to the width. In this case, the narrow fireproof sheet may be disposed between the wide fireproof sheets in the same manner as described above. In this embodiment, the wide refractory sheet 5 is used.
Although the example in which the narrow width fire-resistant sheets 6a and 6b are arranged on the front side and the back side of the connection portions a and 5b has been described, one side may be used when it is assumed that the pressure applied when a fire occurs is small. Further, in the present embodiment, the two long shafts 7a and 7b are connected by the coupling 8, but a switch is arranged for each of the long shafts 7a and 7b and driven independently. Is also good.

[0020]

As described above, in the fire protection screen of the present invention, the wide refractory sheet is connected to close the wide opening, and furthermore, the gap portion formed at the connection portion of each wide refractory sheet is provided. Since the narrow refractory sheet is arranged in the opening, the entire opening can be securely closed. Also,
Since the narrow width fire-resistant sheet is constantly urged to be wound by the biasing force of the coil spring, the narrow width fire-resistant sheet is stretched with a certain tension without being slackened. Can be prevented.

Further, by arranging the narrow fire-resistant sheet on both the front side and the back side of the wide-width fire-resistant sheet connecting portion, this portion can be more tightly closed. Also, if a plurality of long shafts are connected by a coupling, each long shaft can be driven to rotate by one driving means, and each long shaft rotates in conjunction with each other. The wide refractory sheet on which the measuring shaft is wound is lowered in step with the pace, so that the occurrence of loosening can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of an embodiment of a fire protection screen to which the present invention has been applied.

FIG. 2 is a side view showing a configuration of an embodiment of a fire protection screen to which the present invention is applied.

FIG. 3 is a perspective view showing a configuration of a short shaft.

FIG. 4 is a sectional view showing a configuration of a short shaft.

[Explanation of symbols]

 Reference Signs List 1 lintel 2,3 guide rail 4 floor 5 (5a, 5b) wide fireproof sheet 6 (6a, 6b) narrow fireproof sheet 7 (7a, 7b) long shaft 8 coupling 9 (9a, 9b) short shaft Reference Signs List 10 spring (coil spring) 11 sprocket 12 switch 13 output shaft 14 chain 15 seat plate 16 outer cylinder 17 inner shaft 18 rotation shaft 19 fixed shaft 20, 21 fixing pin 22 cylinder 23 bearing 24 rotation bracket 25 fixed side bracket

Claims (3)

[Claims] 1. A fire protection screen for closing a wide opening of a building or the like when a fire occurs to prevent diffusion of flame and smoke, wherein a plurality of long screens are arranged along a width direction of a ceiling portion of the wide opening. A long shaft, a driving means for reversibly driving each of the long shafts, wound around each of the long shafts, ascending and descending with the rotation of the long shafts to release the wide openings,
A wide fire-resistant sheet to be closed, and a connecting portion of each of the long shafts are arranged so as to overlap with each other, a coil spring is arranged inside, and a short length which is always urged to take up by the urging force of the coil spring. A fireproof screen comprising: a shaft; and a narrow width fireproof sheet wound around the short shaft. 2. The short shaft is disposed on the front side and the back side of the long shaft connecting portion, respectively, and the narrow width fireproof sheet wound around the short shaft is provided on the front side and the back side of the wide sheet connecting portion, respectively. The fire protection screen according to claim 1, wherein the fire protection screen is overlapped. 3. The fire screen according to claim 1, wherein each of the long shafts is connected by a coupling, and is driven to rotate in conjunction with one drive means.