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| Number | Title | Issue Date |
| 7175236 | Hammer for breaking concrete The hammer impact cracks the concrete, then separates the concrete from the steel and creates concrete aggregate. The hammer has a pair of arms with an angled portion for sliding on an angled portion of guide plates, which have a long surface in contact with the ham... | 02/13/2007 |
| 7032684 | Method of opening joints between drilling components, and rock drill A rock drill includes a string of components interconnected by screw threads and connected to a shank. A percussion piston is reciprocated against the shank during a drilling operation, while a support device applies axial support to the rear of the shank, to enhanc... | 04/25/2006 |
| 6843327 | Manual machine tool The invention is based on a hand power tool, in particular a drill hammer and/or a chipping hammer, having a striking mechanism (14) capable of being driven in a housing (10) by an electric motor (12), via which an insertable tool (18) si... | 01/18/2005 |
| 6655568 | Setting tool A setting tool including a bolt guide (2) secured in the tool housing (1) against displacement in an axial direction, a spring-biased press-on feeler (6) and an axially displaceable safety sleeve (9) surrounding the press-on feeler (6) and supported for j... | 12/02/2003 |
| 5607022 | Concrete drop hammer attachment device A device removably attaches to a skid steer and is used for breaking up asphalt, concrete, etc. A hollow rod is suspended from the device, and a nipple provides liquid communication to the interior rod chamber of the hollow rod. A head is provided on a lo... | 03/04/1997 |
| 5112338 | Surgical instrument for removing artificial acetabular cups A hand-held surgical rotary impact tool and instrument extension for removing artificial hip, or acetabular, cups of a hip joint by rotating the cup a predetermined number of degrees. This rotational limitation is provided by a pin and arcuate groove conn... | 05/12/1992 |
| 4699223 | Method and device for percussion earth drilling In percussion drilling such as earth drilling, a hammer piston driven by pressure medium is axially reciprocally movable in a drill body to transfer impact energy to a drill shank connectable to a drill bit. The axial position of the drill shank in the dr... | 10/13/1987 |
| 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 |
| 4534419 | Method for pile driving and dragging A method and apparatus for guiding a body into the ground by means of a single hammer acted on by a reaction mass which is driven by a double-acting piston-cylinder unit via a controlled, periodically changing stream of pressure medium and which generates... | 08/13/1985 |
| 4403890 | Method of laying pipe underground and system therefor A method of and a system for laying a pipe underground wherein a head attached to the leading end of the pipe to be laid underground is caused to move in vibratory movement while a propelling force is exerted on the rear end of the pipe to obtain penetrat... | 09/13/1983 |
| 4072198 | Hydraulic rock drill An hydraulic rock drill having an hydraulically reciprocable hammer piston arranged to pound an anvil carrying a drill string. A sleeve type shiftable valve periodically engaged by the piston to effect alternate application to and relief of pressurized hy... | 02/07/1978 |
| 3945442 | Hydraulic rock drill with stroke responsive advance A rock drill having a control valve hydraulically operable to effect feed of oil from a bulk reservoir alternately to opposite ends of a power piston carrying a drill string to reciprocate the piston; having a motor for rotating the piston as the latter r... | 03/23/1976 |
