Mitsubishi Jukogyo Kabushiki Kaisha

Dai-ichi High Frequency Co., Ltd.

Ichiro Shimasaki

Takijiro Shimamoto

Tsukasa Maenosono

Yoji Morita

Ichiro Matsuura

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.

Growing community of inventors

Nagasaki, Japan

Ichiro Shimasaki