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:
Dec. 06, 1994
Filed:
Apr. 19, 1993
Applicant:
Inventor:
Llewellan Anderson, Renton, WA (US);
Assignee:
The Robbins Company, Kent, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
173216 ; 173152 ; 173197 ; 173213 ;
Abstract
The drive head assembly for a drilling machine includes a drive head body having a cavity with an upper portion and a lower portion. A bolt is located in the upper portion of the drive head body cavity, and a collet is located in the lower portion of the drive head body cavity. The collet also includes a cavity. A collet insert is located in the collet cavity, and the collet insert has a drill string opening to fixedly secure a drill string.