Torquer/thruster for flexible roofdrill
US4128133A · kind A · utility
4Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 7, 1976 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | May 7, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1856
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A torquer/thruster with a hydrostatically actuated chuck assembly configured to drivingly engage a flexible roofdrill for applying rotational torque and longitudinal thrust to the roofdrill shaft. The chuck assembly is mounted within a rotatable and longitudinally movable piston assembly, the chuck and piston assemblies fixed against relative movement with respect to one another. The piston assembly is mounted within a rotating barrel assembly, the piston and barrel assemblies being fixed against relative rotational movement and being constrained for limited longitudinal movement with respect to one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.