Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1977-02-22
1979-06-05
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
340596, H01H 3776
Patent
active
041575261
ABSTRACT:
A heat sensing cable is provided for use in an alarm and/or fire extinguishing system, which is capable of responding to the presence of fire, or excessive heat, and to sound an alarm, actuate fire extinguishing sprinkling equipment, operate other fire extinguishing means, or to perform other emergency functions. The heat sensing cable of the invention comprises two or more multi-strand single conductor plastic coated insulated wires twisted together in a spiral manner, and which are placed under tension when in use. Each insulated wire in the multi-conductor heat sensing cable of the invention consists of a single multi-strand conductor of low electrical resistance, formed of copper or other suitable conductive material, and having any particular gage to suit any particular application. The conductor of each insulated wire is coated with a prescribed thickness of selected thermal-responsive plastic material which softens at a predetermined temperature and which, due to its softening, causes the wire conductor in each single conductor cable of like insulation to cut through the plastic and make contact with the conductor or conductors of the other cable having similar insulated wire or wires, when their predetermined temperture is reached. The resulting bare conductors are caused to twist together tightly, making a firm and positive electrical contact.
REFERENCES:
patent: 673903 (1901-05-01), Gould
patent: 2185944 (1940-01-01), Holmes
patent: 2755363 (1956-07-01), Pryor
patent: 3257530 (1966-06-01), Davies
Beecher Keith D.
Broome Harold
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