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. 05, 2008
Filed:
Aug. 17, 2005
Johan Lindén, Gävle, SE;
BO Carlström, Sandviken, SE;
Johan Lindén, Gävle, SE;
Bo Carlström, Sandviken, SE;
Sandvik Intellectual Property AB, Sandviken, SE;
Abstract
A drill bit intended for percussive rock drilling is formed to reduce the occurrence of cavitation during percussive drilling. The drill bit includes an integral skirt and at least one channel for transport of flush medium, such as water. The drill bit has a front face provided with buttons, which define a greatest first external diameter (D). A recess with a female thread, such as a rope or trapezoid thread for percussive drilling, extends into the drill bit from a rear end face of the drill bit. The recess has an axial depth (L). The external surface of the skirt includes a conical portion having an axial extension that is greater than one-eighth of the depth (L) of the recess but smaller than the depth (L) of the recess.