Electric heating – Heating devices – Tool or instrument
Patent
1993-12-14
1995-12-19
Jeffery, John A.
Electric heating
Heating devices
Tool or instrument
336 82, B23K 303
Patent
active
054770270
ABSTRACT:
An electrical soldering device in the form of a soldering gun has a transformer disposed in a housing with a primary winding and a secondary winding. The transformer is supplied from an A.C. source, such as a voltage mains. The soldering tip is in the form of a resistance wire bent into a loop and connected to the secondary winding of said transformer. The secondary winding of the transformer is formed of a cylindrical sleeve of metallic material, preferably copper, surrounding the coil of the primary winding. The cylindrical sleeve has a continuous slit formed therein extending approximately parallel to its cylinder axis. The slit defines mutually opposite edge regions to which the resistance wire is connected. A frequency converter connected in the current supply line to the transformer increases the frequency, preferably into the kilohertz range.
REFERENCES:
patent: 2314865 (1943-03-01), Bierwirth
patent: 2570762 (1951-10-01), Caliri
patent: 2814712 (1957-11-01), Fulmer
patent: 4107701 (1977-04-01), Mittelmann
patent: 4558310 (1985-12-01), McAllise
patent: 4766289 (1988-08-01), Santoro
patent: 5287087 (1994-02-01), Jencks
Biro Laszlo
Molnar Franz
Toth Attila
Greenberg Laurence A.
Jeffery John A.
Lerner Herbert L.
Stemer Werner H.
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