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| Number | Title | Issue Date |
| 7237706 | Drop hammer Embodiments of the present invention pertain to a drop hammer comprising a load, an actuator connected to the load, and a fluid circuit that is connected to the actuator and is connectable to a fluid source, such as a source of hydraulic power. The fluid circuit is ... | 07/03/2007 |
| 7013986 | Impact tool An impact tool enables a front cover part to be easily attached to and detached from a housing body, with a device having a simplified structure. The front cover part has an annular fastening portion clamped to the outer peripheral surface of a front edge portion of... | 03/21/2006 |
| 6152245 | Compressed-air-operated percussion mechanism A compressed-air-operated percussion mechanism includes a housing, a percussion body and a balancing body, which form an operating chamber therebetween. A secondary valve seals the operating chamber during an operating stroke and opens the chamber to evac... | 11/28/2000 |
| 5111801 | Apparatus for forming slit in rock and concrete surface An apparatus for forming a slit in a rock and a concrete surface has a simple construction to enable a deep slit having a predetermined width and smooth inner surface to be made efficiently and also decreases the slit making cost due to replacement of bit... | 05/12/1992 |
| 4947532 | Scaler holder A holder for a plurality of scalers including a rectangular tube 2 forming the main body portion and including coaxial bores in opposite walls 8,10 to secure the scalers 14 and permit easy removal and axial adjustment of individual tools.... | 08/14/1990 |
| 4825960 | Synchronized hydraulic hammer arrangement Hydraulic hammers are useful for transmitting high impact blows to a tool for fracturing hard material. When two hammers are used in combination the impact blows delivered to a common tool by the hammers should be synchronized for maximum effectiveness. T... | 05/02/1989 |
| 4632190 | Pneumatically-operated multi-needle chisel tool A pneumatically-actuated multi-needle type chisel tool is provided having a hollow cylinder body, a piston ram fitted for axially reciprocal movement in a rearward portion of the cylinder body, an anvil fitted for axially reciprocal movement in an interme... | 12/30/1986 |
| 4630687 | Percussion device A pneumatic hammer comprises a cylindrical housing, in which are a free piston, an anvil, and needles the rear ends of which end in heads designed to rest against the anvil and supported by a tool holder. The anvil comprises a steel cylinder in the latera... | 12/23/1986 |
| 4605073 | Device in needle hammers A device in pressure medium operated needle hammers, the needles (24) being arranged in a reciprocatingly movable working member (3) by at least one flexible holder member (31, 39) and, by a friction grip of the holder member being caused to follow the mo... | 08/12/1986 |
| 4452316 | Power hoe with reciprocating blades in sliding engagement with each other A power hoe includes a power source, two substantially planar hoe blades positioned in apposition to one another and power connecting structure to synchronizingly reciprocate the blades in sliding engagement relative to each other. The sliding engagement ... | 06/05/1984 |
| 4247149 | Mechanically actuated impact mechanism An impact mechanism for rock breaking, pile driving and pile extracting, and the like, includes a head assembly (18) with a pair of shank members (24,26) movably mounted thereto and flywheel (76,78) and eccentric crankshaft parts (74) rotated by a motor (... | 01/27/1981 |
