Fastening tool
AssigneeAoyama Seisakusho Co., Ltd.
InventorsKeigo KATOU, Masataka Mizuno, Yoshio Hirooka
Life of this patent
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Abstract
The invention provides a fastening method and a fastening tool which can stably fasten a nut to a bolt securely and with a small dispersion at a desired axial force. A fastened member is fastened by inserting a bolt to the fastened member, thereafter temporarily fastening a nut and the bolt, pulling a leading end of a shaft portion of the bolt in an axial direction of the bolt, rotating the nut so as to screw into the bolt while elastically deforming the bolt so as to generate an axial force, and thereafter canceling the pulling of the bolt.
Claims8
A fastening tool comprising:
- a tubular fastening member rotating a nut;
- a spindle member stored in an inner portion of the fastening member and pulling a shaft portion of a bolt or a leading end of a stud bolt in an axial direction;
- and
- a pressing member pressing a fastened member on the basis of a reaction force applied to the spindle member and provided in an outer portion of the fastening member.
The fastening tool as claimed in 5, wherein the structure is made such as to stop the rotation of the spindle member if the leading end of the spindle member is screwed into a predetermined position from the leading end position of the fixing member.
The fastening tool as claimed in 6, wherein the structure is made such as to stop the rotation of the spindle member if the leading end of the spindle member is screwed into a predetermined position from the leading end position of the fixing member.
Dependencies are inferred from the claim text.