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:
Feb. 21, 2017
Filed:
Mar. 12, 2014
Applicant:
Earth Tool Company Llc, Oconomowoc, WI (US);
Inventor:
Kelvin C. Aus, Watertown, WI (US);
Assignee:
Earth Tool Company LLC, Lake Mills, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 55/00 (2006.01); F16L 55/165 (2006.01);
U.S. Cl.
CPC ...
F16L 55/1658 (2013.01);
Abstract
A thrust apparatus for a rod string. The apparatus has a stationary frame, a thrust frame with a rod gripper, two hydraulic cylinders and two rams in fluid communication with the hydraulic cylinders. During low-load operations, the hydraulic cylinders act alone, providing the load to the grippers to pull or push the rod string. When higher loads are required, a check valve is activated, allowing fluid from the hydraulic cylinders to activate the rams. The rams provide additional force to the grippers, and may be activated without mechanical or significant hydraulic changes to the apparatus.