Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1976-07-12
1978-05-30
Harris, George
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337416, 1161145, 340256, H01H 3776
Patent
active
040926257
ABSTRACT:
A tungsten heating filament is connected in series with a safety filament having a low melting temperature. The filaments are connected to and between terminals of a small terminal board. A quickly-igniting, combustible mixture is applied to the terminal board between terminals, and over and around the heating filament and under the safety filament. The terminal board and its attachments are enclosed in a plastic case with a transparent face. Leads are connected internally to the terminals and externally in parallel circuit across a safety switch operable to open and close by means of a malfunction sensing element, the switch and element comprising an automated safety control, with the switch being connected in series with the electrically energized apparatus. The opening of a safety switch energizes the filaments to ignite the combustible mixture causing discoloration, and to melt the safety filament breaking the filament circuit and preventing energization of the apparatus before automated safety control reset.
REFERENCES:
patent: 2712575 (1955-07-01), Kiel
patent: 2790877 (1957-04-01), Evans et al.
patent: 3118994 (1964-01-01), Kabik
patent: 3948143 (1976-04-01), Olsen
Harris George
Lake, Jr. James B.
Tattle-Tale, Inc.
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