Oilwell swab cup
An oil-well swab cup is formed by clamping a number of vertical wire members in a circular U-shaped cup and molding an elastomeric material around the wires and cup. The reinforcement structure can be metal or any suitable strong material, such as fiberglass or plastic. The structure consists of upwardly extending wires rigidly secured inside a U-shaped circular base cup. The combination of these wires forms a generally cylindrical cage assembly having a narrowed lowered end. The base cup is preferably formed from a single annular piece of metal pressed or forged into the U-shaped configuration. The wires are placed in the slot formed in the base cup, and the outer wall may be swaged downward to hold the wires tightly in it. Alternatively, the inner wall may be swaged outward to clamp the wires tightly. After the wires have been clamped tightly in the base cup in a relatively equispaced relationship, the structure is then placed in a swab cup injection mold. A viscous elastomeric material is injected into the mold under sufficient heat and pressure to fill all the spaces around the wires and base cup. 1 claim.
- Assignee:
- Dresser Industries Inc.
- Patent Number(s):
- US 4099451
- OSTI ID:
- 6274454
- Resource Relation:
- Patent File Date: Filed date 27 Dec 1976
- Country of Publication:
- United States
- Language:
- English
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