Crank connector for directional drilling
US4374547A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1981 |
| Grant date | Feb 22, 1983 |
| Priority date | — |
| Expiry date | May 5, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/067
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An auxiliary locking device for a crank connector of the type including two tubular members interconnected by a shaft having an axis of rotation different from the axes of rotation of the two tubular members. The shaft being rotatably secured to one of the two tubular members, and capable of moving between a first rotatably secured position and a second rotatably disengaged position with respect to the other of said two tubular members for causing the other of the two tubular members to rotate about the axis of rotation of the shaft. The rotation about the axis of the shaft defines acute angles between the axes of rotation of the tubular members and the axis of rotation of the shaft at a point where all three axes intersect. An auxiliary locking means includes at least one retractable finger located in a housing in either one of the shaft and the tubular member disengageable from the shaft, and corresponding grooves located in the other of the shaft and tubular member disengageable from the shaft. The at least one retractable finger extending from its housing when the shaft and corresponding tubular member are disengaged so as to engage the grooves to prevent undesired rotation of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.