Rotary drill bit with rotary cutters
US4263976A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1979 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | May 29, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/20
- 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 pair of filler piece for sealing the opening. One of the filler pieces is made of an elastically compressible material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.