Water powered impulsive unit
US8033343B2 · kind B2 · utility
3Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 7, 2006 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Jan 9, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2222/03
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.