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| Number | Title | Issue Date |
| 5291955 | Hydraulic hammer The present invention is a self-contained hydraulic hammer which is mounted on a hydraulically mobile frame. The hydraulic hammer is capable of travelling in either forward or reverse directions and is provided with liftable weights to which a tool for di... | 03/08/1994 |
| 4660655 | Pile-driving apparatus and method of operating such apparatus Pile-driving apparatus comprises a drop hammer for imparting blows; a winch for lifting the drop hammer between successive blows, the winch comprising a winch drive, a winch drum, a clutch for disengageably engaging the winch drive with the winch drum, an... | 04/28/1987 |
| 4580640 | Stroke control responsive to impact of hydraulic hammer A pickup is connected to a system of sheaves of a mobile hydraulic hammer for providing a signal proportional to velocity of a hammer weight. The pickup is connected to the input of a differentiating circuit, and the output of the differentiating circuit ... | 04/08/1986 |
