Drill bit bearing
US4270812A · kind A · utility
Inventor
Key dates
| Filing date | Feb 2, 1979 |
| Grant date | Jun 2, 1981 |
| Priority date | — |
| Expiry date | Feb 2, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2352/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The bearing surface of a cone cutter bit is hard-faced by forming a substantially cylindrical bearing structure on the drill bit leg having a diameter less than that of the mating bearing on said cone cutter. A cylindrical tubular sleeve of hard low friction metal which has an inner diameter greater than the diameter of said cylindrical bearing structure is inserted over said bearing structure, and a disc is placed over the end and inside said tubular metal sleeve. Solder is flowed between the sleeve and the disc to attach the sleeve and disc to the bearing structure to create a hard-faced bearing. Openings can be preformed in the sleeve or disc to match fluid cooling holes in the drill bit leg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.