Underreamer with cylindrical boss and socket hinge assembly for the cutter arm
US4461361A · kind A · utility
9Cited by
9References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1981 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Dec 7, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/345
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An underreamer having a plurality of drilling arms hingedly attached to a tubular body for movement between a retracted position and an extended position for drilling. The hinge attachment includes a cylindrical boss and socket assembly, between the arm and a removeable hinge plate retained in a recess in the body against outward movement by an engaging key and keyway between the plate and wall of the recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.