GB728853A - An improved safety device for excess temperatures - Google Patents

Abstract

728,853. Temperature alarms. THIELMANN, S. Dec. 10, 1952 [Dec. 18, 1951], No. 31265/52. Class 118 (1). An arrangement for giving an alarm when a predeter. mined temperature is reached comprises a glass capsule having a liquid or solid filling and designed to burst at a predetermined temperature and a spring-loaded plunger held in place by the capsule, so that, when the latter bursts, the plunger moves to release a catch and thereby actuate an alarm. The capsule c rests upon a support b within a casing a and maintains a spring-loaded plunger d in its elevated position so that the upper end of the plunger projects from the casing and so holds an arm g against the action of a spring. When the capsule bursts the plunger d falls and the arm g is thus free to move and operate the alarm. In a modification, Fig. 5, seen from above, the arm g is replaced by two members h acted on by springs in the directions of the arrows and held in place by the tapered end of the plunger d passing through holes in the extremities of the members h. The casing may be made of heat-insulating material, Fig. 6 (not shown), so that the device may be employed in situations where the ternperature is normally higher than that at which the capsule bursts.