Electric heating – Heating devices – Combined with diverse-type art device
Patent
1978-10-16
1981-01-27
Bartis, A.
Electric heating
Heating devices
Combined with diverse-type art device
70431, 219202, 219220, 219221, 219230, 219237, 219240, 219533, 338271, 362 92, 362116, E05B 1700, H05B 340, F21V 3300
Patent
active
042477530
ABSTRACT:
A battery operated portable thawing device for frozen locks has an electrically heated thawing stick sized for insertion into the key hole of a frozen lock. The stick is thinner than the lock key and comprises a hollow metal body inside which is located a thin resistance heating wire. The resistance wire is located between the middle and the end of the stick inserted into the keyhole in a relatively short length (20-30%) of the thawing stick. For use, the stick is slidable out of a protective housing adapted to be gripped in the hand. The housing carries a battery for energizing the stick and a light bulb for illuminating the keyhole. The metal body of the stick serves as one terminal for supplying current to the resistance wire. The circuit between the battery and resistance wire made automatically made when the stick is moved out of the housing for use and broken when the stick is returned into the housing.
REFERENCES:
patent: 2371534 (1945-03-01), McGrath
patent: 2898571 (1959-08-01), Moule et al.
patent: 2965741 (1960-12-01), Blazina
patent: 3022408 (1962-02-01), Wagner
patent: 3450859 (1969-06-01), Brucker
patent: 3536890 (1970-10-01), Hombrecher
patent: 3973422 (1976-08-01), Cervera
Bartis A.
Saffitz Abraham
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