Sucker rod
AssigneeConsolidated Metal Products, Inc.
InventorHugh M. Gallagher, Jr.
Life of this patent
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Abstract
A stronger, lighter sucker rod formed from cold-drawn medium to high carbon steel composed of three basic components which provide versatility in forming the sucker rod. A sucker rod is disclosed which is formed of machined, cold-drawn steel elements. The construction of the sucker rod significantly increases the resistance of the rod to metal fatigue and yields a rod which is smaller in diameter and lighter in weight than an equivalent strength rod made from hot rolled or heat treated steel metal stock.
Claims20
A plural element sucker rod comprised of:
- an elongate rod having two ends, said elongate rod being formed from cold-drawn steel and comprising the main body member of said sucker rod,
- two end portions, said end portions being formed from cold-drawn steel,
- said two end portions being fixedly attached one to each end of said elongate rod and having means thereon for the detachable coupling of said sucker rod into a sucker rod string.
A sucker rod assembled from plural elements comprised of:
- an elongated rod body member having two ends and comprising the main body member of said sucker rod, the two ends being externally threaded,
- two end portions of a box end or pin end shape, said end portions each having an axially extending bore which is internally match threaded with the external threads of said rod body member for attachment of said end portions to said rod body member ends,
- said elongated rod body member and said end portions being formed of cold-drawn medium to high carbon steel having a minimum tensile strength of about 135,000 psi.
An improved sucker rod assembled from plural elements comprising:
- an elongated rod body member having two ends, the two ends being externally threaded,
- two end portions of a box end or pin end shape, said end portions each having an axially extending bore having internal threads for attachment of said end portions to said rod body ends,
- a collar on said end portions adjacent the bore opening thereof, said collar surrounding said rod body member and being spaced therefrom on assembly of the sucker rod, and
- a cement bonding said internal and external threads in engagement, said cement when applied filling the space between said rod body member and said collar.
Dependencies are inferred from the claim text.