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:
Jul. 12, 2011
Filed:
Jan. 04, 2007
Applicant:
Joseph Purcell, Ennis, IE;
Inventor:
Joseph Purcell, Ennis, IE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 10/36 (2006.01); E21B 4/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drill bit assembly for fluid-operated percussion drill tools. The assembly comprises a percussion bit () having a head portion () formed with an axially extending stub shank (). A drive bush () is releasably connectable to the bit head portion (). Axially extending splines () on the drive bush () are slideably engageable with complementary splines () formed on a drive chuck () whereby rotational drive from the chuck () may be transmitted to the drive bush (). The assembly further comprises engagement means on the chuck () adapted for connecting the chuck () to a drive means () of the fluid-operated percussion drill tool.