Static structures (e.g. – buildings) – Controlled by condition responsive means
Patent
1987-06-29
1988-12-06
Murtagh, John E.
Static structures (e.g., buildings)
Controlled by condition responsive means
52220, 52232, 137 77, E04B 548
Patent
active
047888008
ABSTRACT:
There is provided a first stop device having a closure for a conduit passing through an aperture extending through a wall, floor or the like. According to this invention, the conduit passing through the aperture is formed of a low melting point, fugitive metal having a relatively short melting point, e.g., a bismuth-based metallic alloy or lead-tin alloy. A closure housing is disposed parallel to the wall, floor or the like, with one end of the closure housing being disposed adjacent to one surface of the conduit. A fire-resistant closure plate is slidably mounted within the closure housing, the closure plate being spring biased to be in contact with that surface of the conduit. In the event of a fire, at least the portion of the conduit which is in contact with the fire-resistant closure plate is melted almost instantaneously to be in liquid form and so becomes dissipated. This allows the fire-resistant closure plate to be urged, by the bias spring, completely across the aperture in the wall floor or the like. Means are also provided for normally urging the closure means in the second position. Thus normally combustible thermoplastic conduits can be used up to the fire stop and be connected to each end of the conduit without affecting the operation of the fire stop device.
REFERENCES:
patent: 2416284 (1947-02-01), Brown
patent: 3462890 (1969-08-01), Blumenkranz
patent: 3487419 (1969-12-01), Heyerly
patent: 3678634 (1972-07-01), Wise
patent: 3726050 (1973-04-01), Wise
patent: 4136707 (1979-01-01), Gaillot et al.
Monsanto Canada Inc.
Murtagh John E.
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