Self positioning dust seal holder
US5269386A · kind A · utility
2Cited by
14References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Aug 27, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/015
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling apparatus, having a drilling tower, tiltable for angle drilling, on a drilling platform with an aperture for a drill string, includes a dust seal holder that extends into the aperture in the platform, the dust seal holder being connected to the tower, so as to move up and down in the aperture in an arcuate path along with the drilling tower, as the tower is tilted for angle drilling, the dust seal holder being disconnected from the tower, so as to be not movable, as the tower is moved between a horizontal and vertical position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.