Hydraulic head clamp assembly for mobile drill rig
US8056640B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2009 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Mar 5, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic head clamp assembly is integral with a drill head mounted on a mobile drill rig. A side-shift carriage is provided for shifting the drill head from side-to-side relative to a centerline of a drill rod string. The clamp assembly includes a rigid jaw mounted on the side of the drill head, and a movable jaw mounted adjacent to said rigid jaw with a space between the jaws for receiving the drill rod string. The movable jaw is connected to a pair of hydraulic cylinder actuators that are actuated via a hydraulic circuit to control the clamp action between the rigid jaw and the movable jaw. The clamp assembly can be used to retract a drill rod string from the ground without limiting access to the inner diameter of the drill rod, and can also be used to advance the drill rod into the ground via a static push.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.