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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 7600578 | Percussion adapter for positive displacement motors A percussion adapter for a positive displacement motor including a housing, a torque tube and a reciprocating percussive piston operable by application of fluid pressure thereto. The piston can be driven to create a percussive effect by rotary movement of the torque... | 10/13/2009 |
| 7073607 | Operating system for hydraulic rock drill A hydraulic rock drill comprises a housing having a piston and valve bore formed therein, a rotation motor, and a fluid connection and fluid reservoir interposed between the housing and the rotation motor. Fluid connections to the hydraulic rock drill comprise a sin... | 07/11/2006 |
| 6647836 | Lockable telescoping screwdriver A driver attachment (12) for a collated screwstrip (13) carrying screws (16) in which a slide body (20) is slidable in a housing (18) parallel a longitudinal axis (52) about which a drive shaft (34) is rotatable. The slide body (20) receives a screwstrip ... | 11/18/2003 |
| 4648467 | Pressure fluid operated percussion drilling machine provided with a rotation mechanism Pressure fluid operated percussion drilling machine comprising a frame (1) forming a cylinder space (2) for an axially movable percussion piston (3). The frame is provided with channels (4,7) connectable to a pressure fluid source (5) and to a pressure fl... | 03/10/1987 |
| 4289209 | Impact device with fluid tool rotation motor A drilling machine including a rock drill comprising a striking piston fitted to reciprocate in a cylinder. The piston is driven by a pressure medium. A rotation motor is provided and is driven by a pressure medium. A pump piston is permanently connected ... | 09/15/1981 |
| 4103746 | Rotary and percussive devices A hydraulic rotary and percussive device, for example a hand-held hammer or a rock drill, comprises hydraulic reciprocatory percussive means and hydraulic rotary drive means. The means are connected in series hydraulically with the rotary drive means on t... | 08/01/1978 |
| 3971421 | Air-powered, self-feeding screw driving tool An air-powered, self-feeding screw driving tool and screw-containing pods capable of being assembled into a continuous belt of screw-containing rods for use with the tool. The belt of screw-containing pods are coiled within a canister for selective feedin... | 07/27/1976 |
