초록 ▼

A low heat transfer fitting to close an opening in a fire-rated barrier includes a cover plate, a pressure plate, a radially expandible annular gripping ring between the cover plate and the pressure plate, and adjustable fasteners between the two plates to urge them toward each other to expand the r

A low heat transfer fitting to close an opening in a fire-rated barrier includes a cover plate, a pressure plate, a radially expandible annular gripping ring between the cover plate and the pressure plate, and adjustable fasteners between the two plates to urge them toward each other to expand the ring. A body of intumescent material is supported in the opening by the pressure plate with a low heat transfer member. Two embodiments are disclosed.

대표청구항 ▼

A closure fitting for installation in a generally circular opening in a fire rated barrier to maintain the integrity of the barrier comprising the combination of a cover plate dimensioned to cover and extend beyond the periphery of the opening and lie adjacent one surface of the barrier; generally a

A closure fitting for installation in a generally circular opening in a fire rated barrier to maintain the integrity of the barrier comprising the combination of a cover plate dimensioned to cover and extend beyond the periphery of the opening and lie adjacent one surface of the barrier; generally annular gripping ring means having a continuous circular peripheral surface of compressible elastomeric material for fixing the position of the fitting in the opening, said ring means having an outer diameter equal to or less than that of the opening and having an axial thickness significantly less than that of the barrier, one face of said ring means being adjacent a surface of said cover plate; a generally circular pressure plate adjacent the opposite face of said ring means and having a diameter smaller than said opening; means extending between said cover plate and said pressure plate for urging said plates toward each other to axially compress and radially expand said ring means against the opening; a body of intumescent material having a diameter normally smaller than said opening; and means for supporting said body of intumescent material in generally parallel relationship with said pressure plate, said means for supporting said body of intumescent material being adjustable relative to said pressure plate, whereby said body of intumescent material is positionable adjacent an opposite surface of the barrier.