Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – Plural diverse actuating means in single switch
Patent
1975-03-04
1977-04-26
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
Plural diverse actuating means in single switch
337 3, 337 35, 337396, H01H 3702
Patent
active
040204421
ABSTRACT:
Disclosed herein is an improved composite-type heat-system fire sensing device consisting essentially of a differential sensing element and constant-temperature sensing element, capable respectively of actuating a pair of electric contacts. These two type of sensing elements used in customary devices are difficult to assemble and to adjust. There are also serious problems for production and wider utilization of the sensing device. Further, the elements lack practical utilizability as well as reliability. The sensing device of this invention overcomes the abovementioned problems of the customary devices by effecting sensitivity matching of different operation characteristics of the two sensing elements, and makes it possible to optionally and freely adjust the sensitivity of the sensing device as required in accordance with the conditions of the place of installation of the sensing device so as to ensure a higher reliability and wider application of the sensing device.
REFERENCES:
patent: 1172880 (1916-02-01), Denio
patent: 2066700 (1937-01-01), Slough
patent: 2413140 (1946-12-01), Griffith
patent: 2420775 (1947-05-01), Griffith
patent: 3749865 (1973-07-01), Kalt et al.
Ito Hiroshi
Kaminaka Yoshinori
Saito Yoshifusa
Shoji Shunichi
Sugiyama Tadashi
Broome Harold
Hochiki Corporation
Jordan Frank J.
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