Title: Drilling bit

Abstract: A rotary drilling bit having at least one cutter rotatably supported in a rolling bearing on a trunnion of the drilling bit body. An edge ring is provided with a seal fixed in the bored hole of the rotary cutter between the rollers of the rolling bearing and the drilling bit body which axially guides the rollers in one direction. The edge ring has a machined surface which faces the outside surface of the trunnion defining therebetween a narrow annular gap and the seal consists of at least one radially held seal ring arranged in the annular gap.

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Inventors: Olschewski, Armin (Schweinfurt, DE, US)
Huber, Wolfgang (Schweinfurt, DE, US)

Application Number: 944968
Filing Date: 1978-09-22
Publication_date: 1980-07-22
Assignee: SKF Kugellagerfabriken GmbH (Schweinfurt, DE)
Primary Class(es): 384/94 384/480
Other Classes:
US Patent Ref:

3251634	May, 1966	Dareing	308/8.
4035039	Jul, 1977	Johansson et al.	308/8.
4153258	May, 1979	Huber et al.	277/56.

Other Refs: 2021011

Nov, 1972	DE.

Primary Examiner: Footland, Lenard A.
Assistant Examiner:
Attorney: Renz, Jr.; Eugene E.