Device in needle hammers
US4605073A · kind A · utility
11Cited by
11References
4Claims
0Family size
Inventors
Key dates
| Filing date | Jun 27, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Jun 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T279/17957
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A device in pressure medium operated needle hammers, the needles (24) being arranged in a reciprocatingly movable working member (3) by at least one flexible holder member (31, 39) and, by a friction grip of the holder member being caused to follow the movements of the working member, but being permitted an axial play within predetermined limits through overcoming the frictional resistance. In addition, the rear portions of the needles can be arranged in a sealed chamber (34) filled with a hydraulic medium (35).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.