Pile driver
US4187917A · kind A · utility
17Cited by
15References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1977 |
| Grant date | Feb 12, 1980 |
| Priority date | — |
| Expiry date | Nov 30, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D7/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The driving power and driving rate of a pile driver hammer is increased without increasing the overall weight of the hammer through the use of a hydraulic spring transformer which is disposed between the ram and the pile in the housing of the hammer and presents a Q at the frequency where the mass of the ram and the stiffness of the hydraulic spring are in resonance which is less than about one.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.