Aoyama Seisakusho Co., Ltd.

Dan Kitajima

Kazuhiro Koga

Keiichiro Masui

Tsuyoshi Kojima

Kenichiro Araki

Yuichi Katsumata

Provided is a crimp securing structure of a bolt in which a crimp bolthaving a crimping recesson the upper surface of the head is crimped onto a metal sheet. The thickness of a metal material press-fitted into the crimping recessof the crimp bolt is made smaller at the peripheral edge of the crimping recessand is made larger in the center portion thereof. In order to obtain this crimp securing structure, a crimping diein which a stress-relief recessis formed in a center portion of a convex portion is used to prevent the occurrence of excessive local stress in the crimping recess

Crimp securing structure of bolt, crimp securing method for crimp bolt, and crimping die

A device for fixing a nut to an inner surface of a pipe member having a small inner diameter is provided. The device includes a unit box () to be inserted into the pipe member, a rotation shaft () extending from the unit box () to the outside of the pipe member, a cam fixed to the rotation shaft () in the unit box (), and a nut holder () that advances from the unit box () toward the inner surface of the pipe member by the rotation of the cam. A pressure receiving member to be abutted on the inner surface of the pipe member is provided on an opposite surface of the nut holder ().

Growing community of inventors

Niwa-Gun, Japan

Dan Kitajima