Hochiki Corporation

Yoshifusa Saito

Yuichiro Yamamoto

Takeshi Tanigawa

Yoshinori Kaminaka

Tadashi Sugiyama

Hiroshi Ito

Shunichi Shoji

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.

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Tokyo, Japan

Yoshifusa Saito