Rotary drill bit multiple seal assembly

Details Rotary drill bit multiple seal assembly Rotary drill bit multiple seal assembly

1982-11-29

1984-08-21

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 92, 277 95, 277165, 277DIG6, F16J 1524, F16J 1538

Patent

active

044666217

ABSTRACT:
An improved seal assembly for utilization with earth boring drilling bits employing roller cutters. The improved seal is constructed utilizing two resilient O-rings or other resilient seals engaging opposing surfaces in the roller cutter and the corner formed by the shaft and face of the cutter support. The O-rings are mounted in and separated by a flexible floating ring of slightly harder material than the O-ring material. The flexible floating ring may be coated with or made from a material which provides a low coefficient of friction, permitting the O-rings to rotate therein. In an alternate embodiment of the present invention the flexible floating ring is tapered so that increased loading of the earth boring drilling bit will result in increased compression of the resilient O-rings, thus improving the seal under high load conditions. The improved seal of the present invention will accommodate substantial radial, axial and angular displacements of the roller cutter while satisfactorily inhibiting the ingress of detritus and the egress of lubricant.

REFERENCES:
patent: 2789847 (1957-04-01), Jackson
patent: 3057630 (1962-10-01), Sneed
patent: 3397928 (1968-08-01), Galle
patent: 3656764 (1972-04-01), Robinson
patent: 3862762 (1975-01-01), Millsap
patent: 3944306 (1976-03-01), Neilson
patent: 4057257 (1977-11-01), Berg
patent: 4176848 (1979-12-01), Lafuze

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