Automatic cable passage closure and sealing device
US4493173A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1981 |
| Grant date | Jan 15, 1985 |
| Priority date | — |
| Expiry date | Jan 23, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L5/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatic electric cable passage closure and sealing device, for positioning in an opening in a structure such as a floor or wall, etc., for passing or connecting a cable or cables and cable conduits therethrough, the device automatically expanding and sealing itself and the cables and cable conduits in the structural opening on occurrence of excess heat or fire. The device comprises a hollow conducting casing to be positioned in a cable or conduit passage in the structure, said casing having novel means effectuating automatic movement and expansion of intumescing, fire retarding, means on occurrence of fire or highly elevated temperatures, said intumescing means pressing through the cables insulation and onto the conductor wires interiorly of the cables. Said wires are thereby automatically sealed in the casing, and in the structure, said intumescing means expanding in and around the casing, completely filling the casing and the floor or wall opening wherein the casing is positioned, automatically forming a unitary and continuous closure of the structure wherein the device is positioned, preventing passage of heat or flames therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.