The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2016
Filed:
May. 21, 2013
Nikken Kosakusho Works, Ltd., Daito-shi, JP;
Susumu Mikado, Daito, JP;
NIKKEN KOSAKUSHO WORKS, LTD., Daito-shi, JP;
Abstract
A tool holder attachment structure includes a spindle and a tool holder. The spindle has a tip end face and a tapered hole. The tool holder has a tapered shank portion and a flange end face. In a clamped state, there is a clearance of a predetermined size between the flange end face of the tool holder and the tip end face of the spindle. As the spindle is rotated, the tapered hole of the spindle is slightly expanded by a centrifugal force caused by rotation of the spindle, and the presence of this clearance allows the tapered shank portion to be further drawn into the tapered hole so that the flange end face of the tool holder closely contacts the tip end face of the spindle, and the tapered shank portion is closely fitted in the tapered hole, whereby two-face restraint is implemented.