Patent GB-450229-A (GB)
Title: Improvements in and relating to machines for producing permanent waves
IPC: A45D4/12
Filed: 1934-10-09
Abstract: 450,229. Electric hair-waving apparatus. KADUS-WERK GES., Neustadt, Schwarzwald, Germany. Oct. 9, 1934, Nos. 28910 and 28911. Void [Abridged as open to inspection under Sect. 91 of the Acts, April 10, 1935]. [Class 131] [See also Group XI] Hair-waving apparatus is heated by the use of high-frequency currents or of lowfrequency currents of a voltage up to 24. The wound tress, impregnated with an electrolyte, and with or without an impregnated packing, may be interposed directly in the circuit, and the packing may be partly in series and partly in parallel with the tress. When high-frequency currents of more than 2000 kc. are employed, the hair and packing may be situated in the condenser field produced by the electrodes. The apparatus shown in Fig. 1 comprises a series of curlers 4, 5, &c., and a series of metal clips 8, 9 surrounding the wound tresses with the interposition of packings 6, 7. The curlers are connected together by conductors 16, and the clips are similarly connected by conductors 18, the curler 4 and clip 8 being connected to the poles of a high-frequency generator by conductors 17, 19. The individual tresses are thus connected in parallel, but may be connected in series or in groups. The curlers comprise hollow bodies of aluminium with a filling of a heat storage material, e.g. plaster of Paris, and may have a covering of insulating- material. In a modification in which each tress is heated individually, the leads 20, 21, Fig. 4, from the generator are led into a member 22 of insulating-material and are connected through springs 25, 26 to carbon contacts 23, 24 which engage respectively with the curler 31 and the clamp 32. The root of the tress is engaged by a scalp protector 36 comprising hinged metal plates covered on each side with rubber, and the member 22 is enclosed by an earthed metal cover 27 provided at the sides with spring flaps which engage the outer edges of the metal plates of the protector. The rubber covering on the upper side of the protector is formed with turned-up marginal edges in which is placed absorbent for escaping electrolyte. In a further modification, the tress is surrounded by a packing 70, Fig. 26, of tissue paper or the like containing an insertion of cellulose, wadding, or the like and provided on the side adapted to engage the hair with a metal strip or coating 74. A spring metal clip 76 surrounds the packing, one of the handles being provided with a contact plug 79. Current is supplied by a connector 80, one lead being connected to spring jaws situated in the limb 80<11> and engaging the plug 79, and the other lead being connected to a spring 86 contacting with the metal strip or coating 74 and also to a plug 85 engaging the end of the curler 64. Apparatus for use with high-frequency currents of more than 2000 kc. may comprise a hood 46, Fig. 11, enclosing the whole head and situated at a distance from the curlers 49. The hood is provided with inside and outside layers 47, 48 of insulating-material, and the curlers consist of insulating-material with a metal core 50.