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:
Feb. 21, 2017
Filed:
Jan. 29, 2014
Applicant:
Fs Technical Corporation, Tokyo, JP;
Inventor:
Shogo Fujita, Tokyo, JP;
Assignee:
FS TECHNICAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24B 5/48 (2006.01); B24B 5/40 (2006.01); B28D 1/14 (2006.01); E21B 10/32 (2006.01); B24B 33/02 (2006.01);
U.S. Cl.
CPC ...
B24B 5/48 (2013.01); B24B 5/40 (2013.01); B24B 33/02 (2013.01); B28D 1/146 (2013.01); E21B 10/32 (2013.01);
Abstract
A diameter expansion drill bit used for inserting in a prepared hole perforated in a framework to expand a diameter of a portion of the prepared hole by grinding has a plurality of blade sections that grind the portion of the prepared hole, a blade holding section that holds the plurality of blade sections movably in a radial direction respectively, and a shank section that supports the blade holding section, and the plurality of blade sections move to spread outwardly in the radial direction with respect to the blade holding section by centrifugal force due to rotation.