Sub assembly for a swivel

Details Sub assembly for a swivel Sub assembly for a swivel

1987-09-23

1988-11-01

Halvosa, George E. A.

Spring devices

Elastic extension devices

Compression spring

166 775, 267125, 267226, 267291, 464169, F16F 106

Patent

active

047813598

ABSTRACT:
A sub assembly for connecting a power swivel to a drill string. The assembly includes a telescopic sub having a preloaded spring. The telescopic sub has three discrete positions enabling it to travel in either direction from a normal position. This capability prevents thread damage for both when connecting and disconnecting a drill pipe to the drill string.

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patent: 4593773 (1986-06-01), Skeie
patent: 4600062 (1986-07-01), Tang
patent: 4697798 (1987-10-01), Piaer et al.

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