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:
Sep. 29, 1987
Filed:
Apr. 10, 1986
Applicant:
Inventor:
James G Renfro, Spring, TX (US);
Assignee:
Hughes Tool Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25B / ;
U.S. Cl.
CPC ...
81 5734 ; 173164 ; 81470 ;
Abstract
A torque wrench for making and breaking connections between sections of drill pipe. The torque wrench has upper and lower wrench assemblies, each having a gate, a latch, and a clamp. Clamping cylinders apply clamping pressure to the clamps. Torque cylinders apply torque pressure to the upper wrench assembly, to cause rotation of the upper wrench assembly relative to the lower wrench assembly. When the torque pressure is adjusted, a valve causes the clamping pressure applied to the clamping cylinders to automatically vary linearly with the torque pressure.