Yukiwa Seiko Kabushiki Kaisha

Yukiwa Seiko Inc.

Kazuki Aoyagi

Kazuo Sakamaki

Tadashi Taniguchi

Akira Sakamaki

Koji Sakamaki

Provided is a chuck apparatus enabling ease of rotation of a rotating cylinder in the loosening direction when replacing a tool, suppressed wear of the ratchet teeth, and a longer life span. Through the rotation of a rotating cylinder (), the chuck apparatus expands or contracts a plurality of jaws () inserted into a hole () provided to a tip end of a body (), and sandwiches and holds a tool () using the jaws (). An annular rotating body () screwed together with the jaws () and rotating together with the rotating cylinder () is fitted to the body () inside the rotating cylinder (). Annular ratchet teeth () are provided to the body () or the rotating body (), a detachable locking spring body () for locking with the ratchet teeth () is provided, and a lock release mechanism is provided for forcibly releasing the locking between the ratchet teeth () and the locking spring body () when a rotational force in a tightening direction is brought to zero after the rotating cylinder () has been rotated in the tightening direction and a holding force on the tool () has reached a predetermined value.

Chuck apparatus

An extremely useful rotating tool is provided that can prevent rattling caused by a clearance between a machine tool and a machine tool retaining hole while bringing the axial center position of the machine tool and the axial center position of the machine tool retaining hole as close together as possible. The present invention is a rotating tool having a rotating main shaft (), and the rotating main shaft () is provided with a machine tool retaining hole () having a cross-sectional shape that substantially matches a base part () of a driver bit, drill bit, or other machine tool () having a polygonal cross-sectional shape that is inserted into the machine tool retaining hole (), wherein the rotating tool rotates the machine tool () inserted in the machine tool retaining hole () by rotating the rotating main shaft () and performs work. A pushing mechanism is provided for rotating the machine tool () in a prescribed direction and twisting and pushing the machine tool () against an internal surface of the machine tool retaining hole ().

Growing community of inventors

Ojiya, Japan

Kazuki Aoyagi