FR2607017A1 - Fire-break shutter - Google Patents

Abstract

Fire-break shutter, made of steel, intended to re-establish the fire-break ability of a floor or wall when they are passed through by a plastic tube. When fire breaks out, the fuse melts, and the plastic pipe 8 softens rapidly, it is then cut by the blade 3, which, pulled by the spring 4, completely closes the passage of the pipe. Under the effect of the heat, the intumescent join completes the seal.

Description

 The present invention relates to blade fire shutters. The term "fire stop" generally refers to the properties of a device subjected to a fire for a certain time.

(a) to remain stable despite thermal deformations
(b) to oppose the transmission of flames
(o) constitute a thermal barrier which opposes the transmission of heat between the face of the device exposed to fire and the unexposed face.

 This type of shutter knows an important use in accordance with the texts of regulations of fire safety and in particular the decree n 67-I-063 of I5 November I967, obliging the creation of zone delimited by fire walls. That is to say, in the event of a disaster in an area, the walls must not allow the passage of fire in the adjoining area or areas.

 In order to obtain or perfect the insulation between contiguous zones, the conduits must be closed by putting them in communication.

 Ducts for ventilation, air conditioning, industrial dusting networks, pneumatic transport, wastewater or rainwater pipes and, in general, all pipes must therefore have shutters with a fire rating dictated by decrees concerning the type of building considered.

 In known devices of this kind, there are fire shutters, produced according to different principles, either butterfly, plug, guillotine, casement, curtain which all have drawbacks. Strangulation or an obstacle in the passage section of the conduit preventing the passage of the cartridge in the case of pneumatic transport or dust in the case of industrial dusting.

 On the other hand, conventional shutters, butterfly, plug, guillotine, casement or curtain not being leaky cause leaks and prohibit the use of these shutters for the transport of liquids, in particular the evacuations of waste water and other sanitary materials. These fire shutters in most cases are made using asbestos-based materials.

 Furthermore, these fire shutters are of light weight making their implementation difficult and often have a great brittleness, in addition, their installation in existing installations is very difficult, even impossible.

 The fire stopper according to the invention allows the passage of any liquid or solid in the conduit. It does not have an edge, it can be placed in any place.

 The fire stopper according to the invention restores a slab or a partition to its initial fire stop degree placed indifferently on one side or the other of the partition.

 For the realization of the fire shutter according to the invention which does not have the above-mentioned drawbacks, but the advantages described, we use a guillotine principle shearing a plastic material softened by heat.

 Other devices are based on the same bases as that according to the invention, that is to say, the softening of the synthetic materials when they rise in temperature. An American patent, using a ball principle resting on the material, would seem to be close to the device according to the invention, but a little attention allows us to note that the principles are absolutely different.

 A patent application filed in 1977 could not be satisfied because of the apparent similarity of the principle with some existing ones.

This request, which has lapsed, is today replaced by the present, because the device according to the invention if it incorporates certain principles is quite different.

 Figure I is a schematic plan view, showing the fire shutter in the "open" position.

 Figure II is a schematic view showing the shutter without its cover.

 Figureili is a schematic view of the side shutter and in section.

 Figure IV is a schematic view of the shutter with the "triggered" position shown.

 Figures I, 11, III, and IV show the shutter from different sides, with or without its cover, in the "open or" released "position consisting of a sheet steel plate (I), its cover made of sheet steel (2) of the cleaver made of sheet steel (3), a resort (4) of a fuse (5), blind rivets (6) and 6B) and of intumescent material (7) .

 During a fire, the rise in temperature affects the physical characteristics of the plastic conduit (8) which softens. From 800, the fuse (5) (calibrated to 700) melts and releases the chopper (3) which pulled by the spring (4) pivots on its axis (5) formed by a blind rivet (6B), the chopper between in contact with the plastic conduit (8) and this softening is sheared by the chopper (3) the rise in temperature allows the complete shearing of the tube (8).

 To ensure a perfect seal, it is possible to fix on the inner face of the chopper (3) a washer of intumescent material (7) fixed by rivets (6B).

 The spring (4) is held at each of its ends by a square (9) welded by points.

 The assembly is enclosed by the cover (2) which is fixed by means of rivets (6B).

 The shutter which can be placed horizontally or vertically is maintained by metal pins passing through the holes (IO) made in the plate (I).

Claims (6)

 I - Fire shutter characterized by the fact that it comprises a guillotine cleaver held in place by a fusible pin and pulled by a spring in order to shear a plastic pipe when it is softened by heat during a fire or other cause.  2 - Firestop shutter according to claim n I, characterized by the fact that it can be indifferently installed for the protection of a slab (in floor or in pla @ ond) or of a partition.  3 - Fire stopper according to claim n I, characterized in that the chopper can be equipped with intumescent material in order to provide more sealing after shearing of the conduit.  4 - Fire stopper according to claim n I ceractérisé in that it is entirely made of protected steel.  5 - Firestop shutter according to claim No. I, characterized by the fact that it is installed in the manner of a horseshoe around the duct and held in place with a dowel: metal-glow.  6 - Fire shutter according to claim n I, characterized in that by putting a shutter on each side of the wall we triple the degree of fire stop.