| 摘要 |
1487292 Temperature responsive devices K FISCHER 26 March 1975 [27 March 1974] 12549/75 Heading G1D [Also in Division H1] A temperature-responsive actuator for a temperature regulator of an electric appliance e.g. a hot-plate comprises a fluid-filled expansible box 11-, e.g. constituted by corrugated sheet metal members 12, 13, connectible by a capillary tube 22 to a temperature sensor (not shown), an adjusting member such as a rotary spindle 17 Fig. 2 or a rotary face cam (45) Fig. 4 (not shown) acting on one side of the box whereby the actuating temperature of the actuator can be varied, a tubular connection piece 18 e.g. a hollow rivet secured as by welding in a central aperture in the member 12 so as to receive the capillary tube 22, a transmission lever 23, through which the piece 18 extends, which moves in response to expansion of the box 11, and a snap swich 28 arranged transversely with respect to the lever 23 so as to be actuated by movement of the lever. The switch 28 may have two sets of contacts actuable at different temperatures, or two snaps switches may be actuated by the lever 23. In the modification shown in Fig. 5 the lever 23''' includes a bi-metal strip 49 through which current is passed via terminals 50, 51 to heat the strip when, and only when, the snap switch 28' is on, so acting to regulate the average power consumed by the electrical appliance. If terminal 51 is omitted the heating current may be supplied through the switch 28'. Alternatively the bi-metal strip 49 may be heated by a heating coil. |
