Pneumatic rock drill
US7441611B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2004 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Mar 15, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2222/72
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pneumatic rockdrill having a housing; a cylinder connected to a compressed air supply inlet by a set of air passages; an impact piston, at least part of which is reciprocable within the cylinder; and a controller for the supply of compressed air from the air supply inlet to the cylinder. At least one pair of contact surfaces are located at the interface between the piston and the cylinder, where those relatively moving parts contact one another. At least one water supply inlet and water paths connected to the water supply inlet(s) are configured so as in operation to convey water to a drilling tool to flush a hole being drilled, and to supply water to wet the contact surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.