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| Number | Title | Issue Date |
| 7234548 | Hydraulic rotary-percussive hammer drill A hydraulic rotary percussive hammer drill includes a body containing a reciprocating percussion piston sliding under the effect of a main hydraulic supply circuit, this main circuit also being intended to cause the sliding of a roughly annular abutment piston house... | 06/26/2007 |
| 7156189 | Self mountable and extractable ultrasonic/sonic anchor Self drilling anchors and related methods and apparatus. In one embodiment an apparatus comprises a drill bit, a hammer mechanism for hammering the drill bit in a first direction and in a second direction, and a selection mechanism for controlling whether, at a give... | 01/02/2007 |
| 4592431 | Device for deposition of the movements of two driven bodies in the forward direction of a tool A device to transfer the alternately performed reciprocating movements of two pistons in a forward direction of a tool, the pistons being arranged coaxially about a center axis in a casing with the first piston running at least partly in a bore of the sec... | 06/03/1986 |
| 4427078 | Pile-driving ram A ram for driving elongated objects into the ground including a piston jacket, an anvil disposed on the object to be driven, a mechanism located within the jacket for directly impacting with the anvil and for reciprocating at least substantially in a dire... | 01/24/1984 |
| 4184357 | Fastening with two-piece fasteners A powered impacting device including relativly movable concentric first and second pistons, the second piston providing a cylinder wall for guiding movement of the first piston. A spring is disposed between the pistons for exerting a biasing force maintai... | 01/22/1980 |
| 4121671 | Pile driving Disclosed is an apparatus for increasing the effectiveness of hammer-type pile drivers by making possible the use of higher hammer velocities without damaging the pile or the equipment. The apparatus includes a pair of aligned cylinders of unequal diamete... | 10/24/1978 |
| 4036309 | Double-piston rock drill A rock drill has a housing accommodating pistons defining working chambers. Rotary drive of a drill steel has an overrunning clutch and a screw pair. The screw pair is arranged between the pistons and is formed by outer and inner helical threads respectiv... | 07/19/1977 |
| 4026370 | Driving tools A hydraulically actuated driving tool is provided with a ground engageable member which is driven into the ground by the action and reaction of a drive mass which is free to slide within the tool and which is repetitively forced away from and back to the ... | 05/31/1977 |
