Stepped load pull back using rams

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United States of America Patent

PATENT NO 9574696
APP PUB NO 20140270970A1
SERIAL NO

14206548

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Importance

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Abstract

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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.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
THE CHARLES MACHINE WORKS INC1959 WEST FIR AVENUE P O BOX 66 PERRY OK 73077-0066

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aus, Kelvin C Watertown, US 8 25

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