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| Number | Title | Issue Date |
| 7712546 | Power tool having torque limiter It is an object of the invention to provide an effective technique for avoiding the influence of reaction during tightening operation in the rotary fastening tool. Representative rotary fastening tool includes a tool body, a motor housed within the tool body, a driv... | 05/11/2010 |
| 7426966 | Apparatus for imparting relative movement between an oscillating member and a rail The invention provides an apparatus (2) for imparting relative movement between an oscillating member and a rail (4). The apparatus (2) comprises a support (6) in the form of a housing providing a fulcrum (8) and biasing means (... | 09/23/2008 |
| 7168502 | Electric power tool with locking mechanism An electric power tool has a motor-driven circular tool that can be clamped by means of a clamping device. A mechanical braking device (2) serves to brake the tool. A safety element (4) prevents improper handling of the electric power tool. In a safety... | 01/30/2007 |
| 5927408 | Head brake release with memory and method of controlling a drill head A control is provided for a drill head that is mounted on a drill mast. Hydraulic motors raise and lower the drill head and a hydraulically releasable brake holds the drill head in position on the mast. The control has a hoist line that connects the hydra... | 07/27/1999 |
| 5555947 | Mole launcher and a method of operating a mole launcher A mole launcher which has a hydraulically powered, double-acting piston and cylinder unit to push or pull a slider. The slider carries a drill head connected to a drill string. The other end of the drill string carries a mole to bore an underground passag... | 09/17/1996 |
| 5261233 | Brake device of pneumatic rotational tool In an open state of a valve, when a valve outside sleeve is rotated in the rear portion of a housing, a valve inner sleeve is moved forward to close a fluid channel, thus stopping supply of compressed driving air. Simultaneously, a front end of the valve ... | 11/16/1993 |
| 4306626 | Hydraulic earth boring machine A hydraulic earth boring machine for forming conduit passageways beneath established surfaces such as roadways, walkways, or the like. The boring machine includes a hydraulic cylinder having an open axial passageway for receiving a boring shaft. A drive c... | 12/22/1981 |
| 3955629 | Mechanical quill feed unit This application discloses an improved quill feed unit of the type used in automatic or semi-automatic machines for holding and advancing the tool during the machining operation, wherein the rapid advance, feed, and rapid retract movements present in each... | 05/11/1976 |
| 3951216 | Diamond drill supporting apparatus Feed frame assembly for supporting and feeding drill head which rotates drill rod about axis. Assembly includes spaced front and rear end members, laterally spaced longitudinal members and first and second hydraulic feed cylinders. Longitudinal members an... | 04/20/1976 |
