US 4,061,344 AGranted

Fitting for penetration through fire rated barriers

AssigneeGeneral Signal Corporation

InventorsRobert L. Bradley, Daniel J. Sullivan

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Abstract

Penetrations or passageways through fire rated or fire resistant walls, floors, partitions, and ceilings are frequently necessary to provide for present or future pipes, cables or conduits. A fitting placed in the penetration provides a seal to prevent the passing of fire, products of combustion, gas vapor or liquid through the penetration under normal conditions and under adverse conditions of fire or elevated temperatures. The fitting includes an elastomeric-like material, under pressure, which provides the initial barrier. An intumescent material, which responds to heat is provided to expand and fill any void created by the degeneration of the elastomeric material in response to the heat or fire. The fitting may include an outer exposed layer of intumescent material to serve as an insulator.

Claims14

Dependent claims

A fitting for placement in a penetration in a fire rated barrier to maintain the integrity of the barrier before, during and subsequent to a fire and comprising in combination:

a. first and second sealing materials disposed in said penetration which are compressible and intumescent, respectively, and which are in contiguous relationship;
and with said first sealing material subject to dehydration, deterioration and volume reduction in response to a temperature above a threshold temperature and said second sealing material subject to the start of intumescence at, or below, said threshold temperature;
and
b. pressure control means applying pressure to said first and second sealing materials for causing said first sealing material to seal said penetration against the passage of gases through said penetration from one side of said barrier to the other and for confining the initial volume into which said second sealing material expands when it intumesces;
whereby any reduced volume of said first sealing material resulting from deterioration thereof in response to reaching said threshold temperature is filled by the intumescence of said second sealing material for maintaining the seal of said penetration against the passage of gases through said penetration from one side of said barrier to the other.

2 more elements

Dependencies are inferred from the claim text.