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:
Jan. 17, 2017
Filed:
Feb. 16, 2012
Jianing Sun, Shanghai, CN;
Jianing Sun, Shanghai, CN;
NINGBO HUAREN TOOLS CO., LTD., Ningbo, Zhejiang, CN;
TEST RITE INTERNATIONAL COMPANY LIMITED, Taipei, TW;
Abstract
A general-purpose multiple-cutting edge drill includes: a drill point (); a drill body (); margins () located on an outer wall of the drill body (); two lips, wherein, if viewed from an axial direction, from out to inside, each of the two lips successively includes an outer cutting edge (), an arc cutting edge () and an inner cutting edge (); a chisel edge (); outer peaks () formed by intersection of the outer cutting edges () and the arc cutting edges (); a center peak () formed by intersection of two inner flank surfaces and two split surfaces. Moreover, an included angle between the inner cutting edges () ranges from 108° to 128°, an included angle between the outer cutting edge () ranges from 130° to 140°, and an included angle between the inner cutting edge () and outer cutting edge () ranges from 28° to 40°.