Hole drilling device for forming expanded-diameter hole portion

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 10744677
APP PUB NO 20190160707A1
SERIAL NO

16315253

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Abstract

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A hole drilling device for forming an expanded-diameter hole portion at an inner bottom part of a mounting hole includes: a shaft including a contact surface and a tapered surface, and a cutter including a stopper provided on a side surface of the cutter, the stopper coming into contact with a surface of a drilling object. The cutter is movable between a first position and a second position. When the cutter is in the first position, the contact surface is in contact with the inner bottom part of the mounting hole, and the stopper is away from the surface of the drilling object. When the cutter is in the second position, the cutter has been pushed in forward from the first position, the cutting bit has protruded laterally from the tapered surface, and the stopper is in contact with the surface of the drilling object.

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA MIYANAGAMIKI-SHI HYOGO 673-0433

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miyanaga, Masaaki Miki, JP 53 444

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