Dai-ichi High Frequency Co., Ltd.

Mitsubishi Jukogyo Kabushiki Kaisha

Sumitomo Metal Industries, Inc.

Tsukasa Maenosono

Takijiro Shimamoto

Michio Sato

Ichiro Shimasaki

Yoji Morita

Ichiro Matsuura

Shinsuke Kishi

There is provided an inductor for heating the inner circumference of a hole, by which induction heating of the inner circumference of a hole and so on can be realized rapidly and uniformly in the direction of the circumference, and there is no risk of a short-circuit between a solenoidal coil and transition conductor passing therethrough. According to a configuration in which a magnetic core with a cylindrical shape is arranged inside of a solenoidal coil which forms the inductor , and a transition conductor extending from one end of the solenoidal coil to a feeding terminal through the inside of the solenoidal coil is arranged in an inserted manner into a hollow portion of the magnetic core , a risk of the short circuit is avoided by using an insulating material for the magnetic core , assuming that the magnetic core with a large cross-sectional area is concentrically arranged in the solenoidal coil

Inductor for heating inner-circumference of hole

Bonded pipe and method for bonding pipes

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.

High frequency bolt heater having induction heating coil

Growing community of inventors

Kawasaki, Japan

Tsukasa Maenosono