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:
Mar. 19, 1991
Filed:
Feb. 08, 1990
Applicant:
Inventor:
Charles W Haynes, Marshall, TX (US);
Assignee:
Martin-Decker, Inc., Cedar Park, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25B / ;
U.S. Cl.
CPC ...
81 572 ; 81 5715 ; 81 5733 ; 81467 ; 81472 ; 279 64 ;
Abstract
A jaw assembly for apparatus for gripping pipes, the apparatus being of the type having automatic means for exerting increased gripping force upon application thereto, is provided with a member having a concave surface which cooperates with a gripped pipe to override the automatic means for exerting increased gripping force. Having such a member, the jaw assembly of the present invention can exert a predetermined maximum gripping force on a gripped pipe notwithstanding amount of torque applied to the apparatus. Considering angular relationships involving jaw cam angle, the present invention can be manifested in an increasing cam angle jaw for power tongs.