Drilling deck bushing

Details Drilling deck bushing Drilling deck bushing

1980-11-13

1982-04-13

Footland, Lenard A.

Cutlery

308 4R, F16C 3102

Patent

active

043244386

ABSTRACT:
A bushing for the deck of drilling rig in which slowly rotating drilling pipe (drill string) move downwardly to form a bore in the earth. The bushing includes an outer shell, an inner shell mounted for rotation within the outer shell and an elastomeric bushing mounted within the inner shell for rotation therewith. The bushing is formed of a plurality of arcuate segments which are snugly fitted against the drilling pipe by a garter spring which allows for limited expansion of the segments with respect to each other to accommodate pipe of differing diameters. The end portions of the segments overlap one another so that as the bushing is expanded, a seal against dust and fluids is maintained.

REFERENCES:
patent: 3812938 (1974-05-01), Fader et al.
patent: 3833070 (1974-09-01), Anderson
patent: 3850483 (1974-11-01), Roberts et al.
patent: 3944300 (1976-03-01), Learmont et al.

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