Self-limiting electric hair curler heater

Details Self-limiting electric hair curler heater Self-limiting electric hair curler heater

1972-12-27

1976-08-03

Bartis, A.

Electric heating

Heating devices

Tool or instrument

132 33R, 132 39, 219242, 219505, H05B 100, A45D 236, A45D 416

Patent

active

039731006

ABSTRACT:
A heated hair curler has a fast warm-up time and a slow cool down time due to a heater element having a steeply sloped positive temperature coefficient (PTC) of resistivity. The heater is composed of a ceramic like material such as doped barium titanate or a polymer loaded with conductive particles such as polyethylene loaded with carbon black. In one embodiment the heater is shaped in the form of an elongated annulus to fit closely inside a hollow plastic curler shell. Conductive coatings located on the inner and outer peripheral surfaces mate with ring shaped conductors supported in a base. In a second embodiment the PTC heating element which may be in the form of a parallelopiped is located within a sealed cylindrical container, also containing a fusible wax, which in turn fits within the hollow plastic curler shell. The PTC element has conductive coatings on two opposite faces for electrical connection thereto.

REFERENCES:
patent: 2861163 (1958-11-01), Asakawa
patent: 3243753 (1966-03-01), Kohler
patent: 3487197 (1969-12-01), D'Elia et al.
patent: 3559658 (1971-02-01), Genest et al.
patent: 3581055 (1971-05-01), Makino

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