logo

For the Inventor, By the Inventor

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.:

US 9522428 B1

PDFFull Text
Date of Patent:
Dec. 20, 2016

Filed:

Oct. 24, 2013

Small-diameter drill

Applicant:

Sumitomo Electric Hardmetal Corp., Itami-shi, Hyogo, JP;

Inventor:

Masaaki Jindai, Itami, JP;

Assignee:

Sumitomo Electric Hardmetal Corp., Itami-shi, JP;

Attorneys:

Venable LLP

Michael A. Sartori

Primary Examiner:

Daniel Howell

Int. Cl.
CPC ...
B23B 51/02 (2006.01); B23B 51/06 (2006.01);
U.S. Cl.
CPC ...
B23B 51/02 (2013.01); B23B 51/06 (2013.01); B23B 2251/14 (2013.01); B23B 2251/18 (2013.01); B23B 2251/408 (2013.01); B23B 2251/426 (2013.01); Y10T 408/9097 (2015.01);
Abstract

A small-diameter drill having a diameter of φ3 mm or less and an end that has undergone cross thinning is provided such that in a front view, a flute portion cutting edge is curved in concave with a degree of concavity with respect to an imaginary straight line in a range of 0.5 to 2% of a drill diameter, the imaginary straight line connecting the radially outer end of the flute portion cutting edge and the radially outer end of thinning portion cutting edge, the ratio of length of the thinning portion cutting edge to length of the flute portion cutting edge is set to 0.6 to 0.9:1, and in an axially perpendicular cross-sectional view, curvature radius of a heel-side flute surface of the flute is set to be smaller than curvature radius of a flute surface along the flute portion cutting edge.

Find Patent Forward Citations

Jindai, Masaaki. (2016). Small-diameter drill (U.S. Patent No. 9522428). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9522428

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Loading…