Improvements in thermostatic make and break switches

Abstract

Abstract 221,480. Aktiebolaget Birka Regulator. Sept. 8, 1923, [Convention date]. Thermal interrupters. - The amount of energy supplied to an electric heater 5 is regulated by putting the heater in series with a thermal interrupter 1, 2 the heating winding 3 of which is placed together with a variable resistance 4 in a parallel circuit. When the winding3 heats up, the strip 2 will bend to break both circuits. The frequency of the interruption and the relative duration of the " open " and " closed " periods will depend on the amount of the resistance 4. The interrupter may be placed in a receptacle 10 which is evacuated or filled with an inert gas, but in the latter case the receptacle is preferably one with double walls separated by an evacuated space. The receptacle 10 together with the regulating switch 4 may be mounted in a wall plug or the like. A condenser may be arranged across the contacts 1, 2 to prevent sparking.

Inventors

No inventors recorded.

Bibliographic Details