Electrical heater for footwear

Details Electrical heater for footwear Electrical heater for footwear

1991-01-15

1992-08-18

Walberg, Teresa J.

Electric heating

Heating devices

Combined with diverse-type art device

219529, H05B 334

Patent

active

051401312

ABSTRACT:
An electrical heater for footwear which is battery-powered and insertable into the footwear. The electrical heater includes a heatable insole, an electrical conductor, and a battery pack. The heatable insole includes an upper outer fabric layer, a heater insert assembly, and a lower outer rubber layer. The heater insert assembly is very thin and flexible and includes highly heat conductive top and bottom layers with a central layer sandwiched therebetween and having a heat conduction coefficient less than the heat conduction coefficients of the top and bottom layers, therefore acting as a momentary heat dam and storage core. A heating element is coupled to the bottom layer and has a surface area considerably smaller than the surface area of the bottom layer.

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patent: 3946193 (1976-03-01), Giese
patent: 4080971 (1978-03-01), Leeper
patent: 4250398 (1981-02-01), Ellis
patent: 4665301 (1987-05-01), Bondy

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