Abstract: This invention relates to a fire collar (10) that includes a housing (11) having a bore that includes a first opening (13) and a second opening (18), said second opening being spaced from said first opening by at least one side wall (12), and wherein the fire collar further includes mounting means (14) for mounting said housing to a supporting structure, said mounting means being located adjacent said first opening. The fire collar also includes a layer of intumescent material (46) contained within the bore, adjacent the first opening, and supported in said bore adjacent the side wall. The fire collar also includes one or more torsion springs (48) which are operatively connected to the housing and wherein each spring includes a first leg (50) and a second leg (51).

Abstract: A fire collar (10) including a housing defining an opening (18) and a passage (20) adapted to receive a conduit therethrough. A layer of intumescent material (43) surrounds the conduit and is supported by the housing adjacent the opening. Torsion springs (34) are mounted between the housing and the intumescent material to surround the conduit and are held in a non-operational position by fusible links (41). When the heat of a fire melts the links, each torsion spring acts in a longitudinal plane of the passage to assist the intumescent material to collapse the conduit and seal the passage against advancement of the fire.

Abstract: A fire collar, for location in a concrete slab around a deformable conduit, has a housing with a passageway through which the conduit passes. The collar has the housing in which are located two compression springs with arms which are held against the force of the springs by fusible links. When the heat of a fire on one side of the slab causes the fusible links to soften or melt, the force of the springs causes the spring arms to rotate towards the conduit, engaging the conduit and collapsing it. An intumescent layer may be provided around the conduit to assist in collapsing it.

Abstract: A fire collar (10) including a housing defining an opening (18) and a passage (20) adapted to receive a conduit therethrough. A layer of intumescent material (43) surrounds the conduit and is supported by the housing adjacent the opening. Torsion springs (34) are mounted between the housing and the intumescent material to surround the conduit and are held in a non-operational position by fusible links (41). When the heat of a fire melts the links, each torsion spring acts in a longitudinal plane of the passage to assist the intumescent material to collapse the conduit and seal the passage against advancement of the fire.

Abstract: A fire collar or fire damper for location within a concrete slab of a building. The device incorporates a damper arrangement (12) and a heat detector (18, 19) comprising a metal alloy or lead which melts when a present temperature is reached, causing the damper arrangement to seal off associated pipework or ducting.