Anti-jamming core barrels
An improved anti-jamming mechanism for use in a coring tool is devised by providing a rotary jar within the inner barrel of the coring tool. The inner barrel is connected to a bearing assembly into which a bearing shaft is axially and concentrically disposed. The bearing assembly is rotatably journaled to the bearing shaft. The bearing shaft is rotatably and longitudinally fixed with respect to the outer barrel of the coring tool. The bearing shaft and bearing assembly are longitudinally displaceable with respect to each other by Bellville washers. The bearing assembly also includes a rotary anvil which is ultimately brought into contact with a rotary hammer which in turn is fixed with respect to the outer barrel. An impulsive torsional and longitudinal force is imparted by the rotary hammer to the rotary anvil through the resilient coupling between the bearing shaft and bearing assembly disposed within the inner barrel.
- Assignee:
- Norton Christensen, Inc.
- Patent Number(s):
- US 4558749
- OSTI ID:
- 5757191
- Resource Relation:
- Patent File Date: Filed date 17 Oct 1983; Other Information: PAT-APPL-542386
- Country of Publication:
- United States
- Language:
- English
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