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AssigneesMitsubishi Jukogyo Kabushiki Kaishi, Dai-Ichi High Frequency Co., Ltd.
InventorsTakijiro Shimamoto, Yoji Morita, Ichiro Shimasaki, Ichiro Matsuura, Tsukasa Maenosono
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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.
A high-frequency bolt heater for use in heating a bolt having an axial hole, said heater comprising:
A high-frequency bolt heater for use in heating a bolt having a predetermined length, an axial hole, and a threaded portion for engaging a nut, said heater comprising:
Dependencies are inferred from the claim text.