ROBERT LARRY RANKIN
Engineers in Butler, PA
License number
Pennsylvania PE028412E
Category
Engineers
Type
Professional Engineer
Address
Address
Butler, PA 16001
Professional information
Fire-Suppressing Foam Level Controller
US Patent:
4169278, Sep 25, 1979
Filed:
Mar 6, 1978
Appl. No.:
5/883368
Inventors:
Ferdinand Roehlich - Allison Park PA
Robert L. Rankin - Butler PA
Robert L. Rankin - Butler PA
Assignee:
Mine Safety Appliances Company - Pittsburgh PA
International Classification:
H01H 4712
US Classification:
361178
Abstract:
An electric circuit for energizing a fire-suppressing foam generator includes a switch that is opened and closed by means operated by electric control circuits, one of which contains a pair of laterally spaced lower electric probe contacts mounted in the protected area and adapted to be bridged by a rising level of foam to close that circuit. The other control circuit contains a pair of laterally spaced upper electric probe contacts above the level of the lower contacts and adapted to be bridged by a rising level of foam to close the last-mentioned control circuit.