H - Electricity – 01 – H
Patent
H - Electricity
01
H
340/157, 306/180
H01H 37/46 (2006.01) G08B 17/06 (2006.01) H01H 37/32 (2006.01)
Patent
CA 1166717
ABSTRACT OF THE DISCLOSURE A rate of temperature change detector, particularly for use as a "rate of rise" type fire detector, comprises two elements of shape memory effect (SME) material, adapted to deflect in opposition when heated through their temperature transformation range. A first element is housed in a thermally conductive sheath and hence reacts quickly to changing temperatures outside the detector, while the other element is surrounded by less thermally transmissive structure and reacts more slowly. The two elements are biased apart by a compression spring and an additional spring biases the first-mentioned element only. A rod connected with the first element carries an electrical contact which closes the gap with a fixed contact when that element overcomes the biases of the two springs and the further bias of the other SME element, the movement of the first element being thus related to the rate of rise of temperature experienced outside the detector. In another embodiment the two SME elements are again subject to different rates of heat transmission from the environment but are biased equally, and the output is related to the difference in deflection between the two elements.
407169
Andrews David J.
Hart William B.
Chubb Fire Security Limited
Fetherstonhaugh & Co.
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