GB951834A - A hair dryer hood - Google Patents

Abstract

951,834. Hair driers. H. KEGEL. Dec. 13, 1961 [Dec. 13, 1960], No. 44654/61. Heading A5R. [Also in Division G1] In a hair drier, a humidity senser in a hood operates to switch-off an air circulator and heater when the humidity of the air in the hood falls below a predetermined value. As shown, Fig. 1, the hood contains a humiditysensitive resistance transducer 1, a temperature compensating transducer 1a and relays 3, 4 which are actuated in accordance with variation of resistance of transducer 1 to control the operation of a motor 12 driving a fan 2, and of heater means (not shown). Tranducers, Fig. 2. Transducer 1 comprises a piece of fabric 9 impregnated with lithium chloride or other hygroscopic material in a slotted resin housing 10. Terminal pins 8 which co-operate with bushes 7 in a mounting plate 6 within the housing facilitate replacement of the transducer. Transducer 1a is similar and is sealed to render it insensitive to humidity. Control system. Fig. 4. Transducers 1, 1a are connected in circuit with a relay 3 in such a manner that, at a predetermined humidity, the relay 3 operates to actuate a second relay 4 which opens a contact in the supply circuit to the motor 12 and heater. 14 is a by-pass switch which opens automatically after a predetermined time, and 13 is a position responsive switch which keeps the supply circuit open except when the hood is in its normal operating position.