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:
Nov. 22, 2016
Filed:
Feb. 11, 2011
BO Carlstrom, Sandviken, SE;
Jens Sundin, Sandviken, SE;
Susanne Lejon, Sandviken, SE;
SANDVIK INTELLECTUAL PROPERTY AB, Sandviken, SE;
Abstract
The invention relates to a drill bit () for percussive rock drilling, which comprises: —a drill head (); —a skirt (), which has a first end and an opposite second end, the skirt being connected to the drill head at said first end; —a recess () extending axially through the skirt from the second end of the skirt towards the first end thereof, the recess being provided with an internal, cylindrical female thread (); and —an impact surface () at the bottom of the recess. Every cross-section of the recess () between the impact surface and the part of the recess where the female thread has its full thread profile has a cross-sectional area which is smaller than the cross-sectional area of a cross-section of the recess at the part of the recess where the female thread has its full thread profile.