×

Lead-through for electric cables and the like

  • US 3,976,825 A
  • Filed: 06/24/1975
  • Issued: 08/24/1976
  • Est. Priority Date: 01/15/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. A lead-through, for conducting electrical cables and the like through an opening in a wall or ceiling said lead-through being fire-proof, gas-proof, and liquidproof at a predetermined temperature, comprising:

  • a frame structure for bounding an opening in a wall or ceiling;

    inwardly extending flanges on two opposing sides of the frame structure narrowing the opening of said frame structure;

    a plurality of guide means within said frame structure forming a plurality of spaces for cables to be passed through said opening, said guide means individually encircling each of one or more cables when said cables extend through said frame structure, said guide means being composed of a material having a relatively high coefficient of cubic expansion, whereby in the event of fire, said guide means will expand and form tight seals around the cables and against each other to prevent transfer of flame and combustion gases through said lead-through;

    a plurality of filling members extending between the sides of said frame structure and said guide means, said filling members being composed of a material having a relatively high coefficient of cubic expansion, whereby, in the event of fire, said filling members will expand and form tight seals against said guide means, against said frame structure and against each other to prevent transfer of flame and combustion gases through said lead-through; and

    retaining means for retaining said guide means and said filling members within the confines of said frame structure, said retaining means arranged to abut and rest upon said flanges of said frame structure adjacent a first outer end of said opening, said guide means and said filling members abutting said retaining means.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×