G - Physics – 08 – B
Patent
G - Physics
08
B
306/156
G08B 17/06 (2006.01) H01B 7/10 (2006.01)
Patent
CA 1097710
S P E C I F I C A T I O N MULTI-STAGE HEAT SENSING CABLE AND EMERGENCY COMMUNICATIONS SYSTEM ABSTRACT OF THE DISCLOSURE 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 to- gether 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 thermosponsive 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 plas- tic and make contact with the conductor or conductors of the other cable having similar insulated wire or wires, when their predeter- mined temperature is reached. The resulting bare conductors are caused to twist together tightly, making a firm and positive electrical contact. When more than two insulated wires are used in the heat sensing cable of the invention, the plastic coating of one or more can be selected to soften at a higher temperature than the initial two, so that two, three or more alarms may be activated, one when the first is in its incipient stage, and a second and third alarm, if the fire increases in intensity. The first alarm may be used to alert local personnel, and the second alarm may be used to alert a central fire station in the event the local personnel were unable to cope with the fire, the third alarm will indicate to the Fire Depart-¦ ment that a major or rapid fire is in progress.
297383
Davies John S.
Meredith & Finlayson
LandOfFree
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