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:
Aug. 05, 1997
Filed:
Apr. 14, 1995
Applicant:
Inventor:
H Dewain Whisenhunt, Mukwonago, WI (US);
Assignee:
Harnischfeger Corporation, St. Francis, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ; B25B / ;
U.S. Cl.
CPC ...
175 52 ; 175 85 ; 175162 ; 173164 ; 81 5733 ;
Abstract
An automatic breakout wrench with: the clamping jaw located on the inside of the pipe so that the clamping grip is not reduced by the force of the breakout cylinder; the orientation of the breakout cylinder resulting in the breakout cylinder creating a moment that forces the wrench toward the pipe rather than away from the pipe; pivotal movement of the wrench member guided by three pins; the wrench member pivoting twenty-four degrees; the clamping jaw pivotally mounted on one of the pins guiding movement of the wrench member; and shims secured in a manner so as to be easily inserted and removed.