Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
James Walter George Truss0
Date of Patent
August 31, 2010
0Patent Application Number
116640700
Date Filed
September 26, 2005
0Patent Primary Examiner
Patent 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.
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