High frequency bolt heater having induction heating coil

Details High frequency bolt heater having induction heating coil High frequency bolt heater having induction heating coil

1994-01-06

1995-03-14

Leung, Philip H.

Electric heating

Inductive heating

Specific heating application

219673, 219635, 219670, 219676, H05B 614

Patent

active

053978765

ABSTRACT:
A high frequency bolt heater is provided which can heat up the inside of a narrow hole much faster than a conventional bolt heater employing a resistance wire. The high frequency bolt heater includes an induction heating coil made of a copper tube bent in a hairpin fashion and whose shape is made approximately circular in section by pinching a magnet between opposed portions thereof. The heater can be inserted into a hole bored in the axial direction of a metallic bolt. A length of the coil is made approximately equal with that of the bored hole, and the magnet is omitted from a region of the heater which corresponds to a screw portion of the bolt for mounting a nut. An adjustable stopper made of a heat resistant electrical insulator is provided for setting a necessary length of the induction heating coil to be inserted into the hole, and a heat resistant insulator is provided on the surface of the induction heating coil.

REFERENCES:
patent: 2176601 (1939-10-01), Bates
patent: 2397629 (1946-04-01), Stevens
patent: 2810053 (1957-10-01), Messner
patent: 3236993 (1966-02-01), Jones
patent: 3393286 (1968-07-01), Zandstra
patent: 4100387 (1978-07-01), Reinke et al.
patent: 4574172 (1986-03-01), Burack et al.
patent: 4590347 (1986-05-01), Thatcher et al.

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