Amplitude changing apparatus
US4645014A · kind A · utility
1Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Nov 13, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01C19/286
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention is directed to an apparatus for resetting the vibration amplitude of a hydraulically driven vibration device having two eccentric weights arranged on a rotating shaft and rotatable relative to each other. The amplitude-resetting arrangement includes a hydraulic directional valve for resetting the vibration device between high and low amplitudes. The valve is electrically operated and the electric control circuit incorporates a time-delay relay for delaying the amplitude change until the speed of the rotating shaft has been reduced to an acceptable level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.