US 7,441,565 B2 · Fire protection zone penetrating member and injection-molding method for the same

Abstract

A low cost and mass-producible fire protection zone penetrating member is provided which can be set on piping or the like with a one-touch operation as well as a method of injection-molding the fire protection zone penetrating member. One expanding slot is provided on a cylindrical body made from thermally expanding graphite, thermally expanding rubber, or thermally expanding resin as a main ingredient thereof. The slot extends in a longitudinal direction. A piping inlet section is formed at an entrance of the expanding slot so that piping can be set in or taken out from inside the member by means of a one-touch operation. The fire protection zone penetrating member has the configuration as described above and is manufactured with an injection molding machine. The cylindrical body as a main body of the fire protection zone penetrating member may have an oval cross section, so that the fire protection zone penetrating member can be applied to piping having a diameter in a wide range. With this feature, a number of required types of the product can be reduced with the unit production cost lowered.

Claims3

Dependent claims

A fire protection zone penetrating member, comprising:

a cylindrical body formed of thermally expanding graphite, thermally expanding rubber, or thermally expanding resin, said cylindrical body having a first cylindrical body edge and a second cylindrical body edge, said first cylindrical body edge being located at a spaced location from said second cylindrical body edge to define an expanding slot extending in a longitudinal direction of said cylindrical body, said first cylindrical body edge and said second cylindrical body edge defining a V-shaped cut piping inlet section located at one end of said cylindrical body, said cylindrical body having an oval cross section and an outer cylindrical body surface;
a first metal plate adhered to said outer cylindrical body, said first metal plate being located at a spaced location from said first cylindrical body edge;
a second metal plate adhered to said outer cylindrical body, said second metal plate being located at a spaced location from said second cylindrical body edge, said second metal plate being located at a spaced location from said first metal plate such that said first metal plate is opposite said second metal plate.

Dependencies are inferred from the claim text.

Fire protection zone penetrating member and injection-molding method for the same

Life of this patent

Fire protection zone penetrating member and injection-molding method for the same

Life of this patent

Abstract

Claims3