Sanyo Machine Works, Ltd.

Hiroshi Hashimoto

Kinya Mori

Akira Kato

Tetsuo Abe

There are disclosed a method and device for tightening bolts, characterized by including drive means, detection means and control means whereby a bolt (or nut) is turned at high speed until it comes in contact with the tightening bearing surface of a member to be clamped (such as a plate), whereupon it is turned at low speed through a predetermined angle until it is stopped at a predetermined tightening completion position.

Device for tightening bolts

A method is provided for fastening bolts and like threaded fasteners wherein the bolt is rotated initially at a high rate of speed until it comes to a point in relation to the bearing surface of the member to be clamped not past the snug point of the bolt head to the bearing surface of a member to be clamped, such as, for example, a plate, whereupon the bolt is thereafter rotated at a low rate of speed of rotation through a predetermined angle until it is stopped at a predetermined tightening completion position.

Method for tightening bolts

An apparatus for automatically feeding and setting stud bolts. The apparatus comprises a parts feeder unit for axially arranging stud bolts having threaded portions of different lengths on the opposite ends thereof in a low, a bolt orienting unit for directing stud bolts in one direction, an escapement unit for correctly feeding stud bolts one by one, an impact wrench unit for screwing stud bolts into intended work to set them in position, a pneumatic pressure control unit for feeding compressed air produced by a compressor into the escapement unit and impact wrench unit, and an electric control unit for electrically controlling the units, the arrangement being such that all operations which end up with screwing stud bolts into intended work to set them in position are carried out mechanically.

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Aichi, Japan

Hiroshi Hashimoto