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| Number | Title | Issue Date |
| 7284511 | Combustion-engined setting tool A combustion-engined setting tool for driving fastening elements in a constructional component end including a combustion chamber (13) for combusting a gas mixture, an inlet/outlet device (40) for opening the combustion chamber (13) in its first... | 10/23/2007 |
| 7178487 | Combustion-engined setting tool A combustion-engined setting tool for driving fastening elements in constructional components includes a combustion chamber (14) for combusting therein a full gas-oxidant mixture, at least one guide element (20) arranged coaxially with a longitudinal a... | 02/20/2007 |
| 6938704 | Pneumatic percussive tool with a movement frequency controlled idling position The invention relates to a pneumatic percussive tool for a paving breaker and/or a hammer drill comprising a drive piston which is displaceable both backwards and forwards by a crankshaft and arranged in a percussion piston which is displaceable both backwards and f... | 09/06/2005 |
| 6474300 | Device and method for controlling the speed of an internal combustion engine A device for controlling the speed of an internal combustion engine in a working tool including a device for recognizing a special operating state of the working tool. By way of example, a special operating state can be taken to mean the start-up of the i... | 11/05/2002 |
| 6102133 | RAM For selective operation in a Diesel mode and a pressure air mode a Diesel type pile hammer is additionally equipped with a pressure air accumulator, which is connected to the working space of the cylinder by a servo valve.... | 08/15/2000 |
| 4645016 | Resonant pile driving system A pile driver is described wherein a piston within an internal combustion engine is rigidly coupled to the pile to be driven. The engine is resiliently coupled to the pile so as to move with the pile. Control circuitry modifies the frequency of operation ... | 02/24/1987 |
| 4583601 | Hammer drill A "hole bottom" hammer drill comprising a tubular body (1) supplied with compressed air, a drill bit (3) and a percussion piston (38) caused to move in an inner cylinder (7) by a mechanism distributing compressed air alternately below and above the piston... | 04/22/1986 |
| 4580641 | Method and apparatus for starting diesel type hammers A self starting diesel hammer (20) having a tubular casing (30) inside which a heavy ram (32) is driven up by means of an explosion and then falls back onto an anvil (46) while compressing air under the ram so that fuel injected under the ram (32) causes ... | 04/08/1986 |
| 4497376 | Interchangeable ram diesel pile A diesel-engine pile driving hammer provided with interchangeable rams for use in a single, outer, cylindrical casing. A large diameter hole or orifice is provided in the casing between a pair of an array of alternate orifices which are capable of being p... | 02/05/1985 |
| 4473123 | Diesel hammer capable of delivering uplift blows and method of using same A diesel hammer (20) is adapted to produce uplift blows by connecting its casing (30) via a pulling connection (52) to a case (24) to be pulled, removing vent plugs (76) from the top of the casing, sealing all other openings (78), (82), (94), in the casin... | 09/25/1984 |
| 4034816 | Demolition tool The present invention is a projectile type demolition tool. A projectile with an enlarged upper cross-sectional area is slideably mounted within and extendable from an inner cylinder. The lower portion of the projectile is extendable through a guide conne... | 07/12/1977 |
| 3941101 | Impact action mechanism An impact action mechanism of the type wherein the impact member is propelled by a combustible matter combusted in the combustion chamber of the mechanism. The impact action mechanism includes a hollow housing receiving therein a reciprocating impact memb... | 03/02/1976 |
