Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With longitudinally expansible solid element
Patent
1977-04-27
1978-09-05
Harris, George
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With longitudinally expansible solid element
340593, H01H 3746
Patent
active
041124073
ABSTRACT:
A fire sensing device for actuating associated fire alarm system having a heat receiving plate member of improved heat receiving efficiency for rapidly transmitting any abnormal heat received from environmental atmosphere to a heat-responsive switching means thermally connected to the plate member to actuate the alarm system promptly and reliably is provided. In order to enlarge surface area, the heat receiving plate member has many fins comprising elongated bridging parts defined by adjacent ones of many parallel slits made in the plate member and twisted about elongated axis preferably by an angle of 40.degree. to 60.degree. with respect to the plane of the plate member so as to be raised at both longitudinal edges from the member on its both sides, whereby abnormally heated air passing along a surface or surfaces of the plate member is caused to flow along the fins through or into the slits to rapidly and efficiently transmit its heat to the plate member.
REFERENCES:
patent: 1117347 (1914-11-01), Dixon
patent: 1179276 (1916-04-01), Bullock
patent: 2824300 (1958-02-01), Rand
patent: 3391402 (1968-07-01), Lucas et al.
Kameyama Yasuyoshi
Suzaki Satoru
Harris George
Matsushita Electric & Works Ltd.
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