Electricity: conductors and insulators – Overhead – Towers – poles or posts
Patent
1974-01-25
1976-11-30
Truhe, J. V.
Electricity: conductors and insulators
Overhead
Towers, poles or posts
52232, 169 48, H02G 322, A62C 316
Patent
active
039951022
ABSTRACT:
This invention relates to an insert device for cables adapted to be positioned in structural openings, such as, for example in holes drilled into or formed in floors and other planar surfaces of structures such as buildings, to facilitate connection of power lines, cables and wires from a source into a cable receiving junction box at the underside of the floor and through the insert device and thence to a service head at the upper face of the floor, for connection of various accessory devices thereto, fire retarding means being provided to seal the device in said floor opening and to seal said cables therein, said fire retarding means automatically foaming to effectuate the sealing action described, on occurrence of fire or excessive temperatures, to effectively so seal the assembly. The cables on such occurrence, are thus sealed in said insert device in air-tight, spaced relation to each other; spread of fire and excess heat therethrough will be automatically prevented, and the fire protective rating of the floor wherein the insert device is so mounted and used will be substantially equivalent to the original rating of the floor.
REFERENCES:
patent: 1869841 (1932-08-01), Buchanan
patent: 2279791 (1942-04-01), Lamb
patent: 3318476 (1967-05-01), Clark
patent: 3336153 (1967-08-01), Juda
patent: 3455850 (1969-07-01), Saunders
patent: 3751576 (1973-08-01), Klinkman et al.
patent: 3803341 (1974-04-01), Klinkman et al.
patent: 3864883 (1975-02-01), McMarlin
Raceway Components, Inc.
Tone David A.
Truhe J. V.
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