Patent · US Expired

Rotary drill bit with rotary cutter

US4256193A · kind A · utility

12Cited by

6References

7Claims

0Family size

Assignee

Sandvik AB, Fack & Aktiebolaget SKF · SE

Inventors

Heinrich Kunkel · Schweinfurt, DE
Armin Olschewski · Schweinfurt, DE
Manfred Brandenstein · Aschfeld, DE
Lothar Walter · Schweinfurt, DE

Key dates

Filing date	May 29, 1979
Grant date	Mar 17, 1981
Priority date	—
Expiry date	May 29, 1999

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/22
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rotary drill bit having a drill bit body and at least one trunnion projecting from the drill bit body and a rotary cutter supported on at least one radial roller bearing on the trunnion. The rolling elements of the bearing are guided on at least one axial end facing the drill bit body in an outer bearing race groove incorporated in the bore of the rotary cutter. The inner bearing race groove is formed on the trunnion for the rolling elements of the radial roller bearing. At least one filling opening is provided which extends through the drill bit body and trunnion and is essentially axially oriented having one terminal end adjacent the inner bearing race groove and at least one filler piece for sealing the opening.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.