GB846134A - Improvements in electro-thermal relays - Google Patents

Abstract

846,134. Thermal switches. G-V CONTROLS Inc. July 10, 1957, No. 21928/57. Class 38 (5). In a switch which is operated by the expansion of an electrically heated control element 22, an ambient temperature compensating member 28, 32 has a zone of flexure at 38 and the actuating arm 58 for the moving contact 60 is mounted on the member at a point adjacent the zone of flexure. As shown in Fig. 1, the element 22 is of the type described in Specification 765,610, the struts 28, 32 forming the temperature-compensating member are of channel section and the actuating arm 58 is in the form of a spring carrying the moving contact. A glass bead 42 mounted on a bracket 46 bears against one arm 48 of an L-shaped lever so that the position of the moving contact may be adjusted by means of a screw 52 threaded on the other arm 49 of the lever. In an alternative form, Fig. 7, the control element 122 is heated by an external winding and the moving contact 82 is separately mounted on the base and actuated by a glass bead on the compensating element 128.