Patent ID: 7441565

Claim:
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.