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| Number | Title | Issue Date |
| 6439317 | Device for breaking concrete The present invention provides a device for breaking up a paved surface which attaches to a host transport, such as a skid steer or backhoe, having a hydraulic power supply and preferably comprises a closed hydraulic system which includes a regenerative a... | 08/27/2002 |
| 5445227 | Release mechanism for a hydraulic post driver A release mechanism for a hydraulic/pneumatic post driver is described. The post driver has a hammer and a guide for directing the hammer from a raised release position along a substantially vertical downward impact path. A hydraulically or pneumatically ... | 08/29/1995 |
| 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 |
| 4993500 | Automatic drive hammer system and method for use thereof An automatic drive hammer system includes an automatic drive hammer apparatus which is carried by a bucket pivotally mounted to a drill rig. The drive hammer apparatus may be pivoted in the bucket from an off-hole storage position to an on-hole loading/un... | 02/19/1991 |
| 4852661 | Portable concrete hammer A portable concrete hammer including a wheeled carriage, a mast movable between a vertical operating position and a horizontal transport position, and an automatic ratchet drive that advances the concrete hammer over a concrete surface during the portion ... | 08/01/1989 |
| 4714186 | Fastener driving tool A fastener driving tool comprising a spring activated hammer, wherein the hammer is manually cocked. A foot actuated cocking mechanism is disclosed for cocking the hammer.... | 12/22/1987 |
| 4561479 | Mechanical wood splitter A mechanical wood splitter comprises a weighted cutter which is raised on a support column by means of a winch and cable drive, and then allowed to drop, in order to split a log of wood positioned thereunder into segments, by uncoupling the winch drum fro... | 12/31/1985 |
| 4473256 | Chisel barge with shock absorbing system for mast A chisel barge having an elongated hull floatable on a body of water with positioning means thereon maintaining the position of the hull in a generally fixed location while in a floating condition spaced from land. Bracket structure is provided on the hul... | 09/25/1984 |
| 4460303 | Drill pipe loader A drill pipe loader is disclosed having the capability of positioning and locking in place the top holder plate from a remote position therefrom independent of the lower cup plate.... | 07/17/1984 |
| 3958646 | Penetrometer frames A penetrometer frame for mounting on, for example, a truck and comprising a fixed part provided with slides which guide a moving part in the form of a frame which itself serves as a guide for a driving hammer and which may be raised or lowered by two hydr... | 05/25/1976 |
