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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7422542 | Method of monitoring a chain pulley block and chain pulley block apparatus A method for monitoring a chain pulley block and a chain pulley block apparatus with an electric actuator motor (2) that is connected at the drive side to a transmission (7) across a sliding clutch (14). In order to achieve a safe operation of t... | 09/09/2008 |
| 7096608 | Overload prevention device for a snow removing machine An overload prevention device has a first rotational member for driving engagement with an input shaft of an auger transmission of a snow removing machine, a second rotational member engaging the first rotational member for rotation therewith over a predetermined to... | 08/29/2006 |
| 6910540 | Torque control system for electrically driven rotating tools A torque control system for electrically driven rotating tools capable of always properly and efficiently effecting constant-torque tightening of screws or the like and capable of easily achieving the miniaturization of the whole device and the improvement in torque... | 06/28/2005 |
| 6523283 | Overload protecting device for snow removing machine An overload protecting device assembled in an auger transmission is disclosed as including a worm wheel having its side wall formed with a plurality of wheel-side protruding segments, a boss member engaging with the wheel and fixedly coupled to an auger s... | 02/25/2003 |
| 6443872 | Apparatus for protecting automatic clutch from overheating An apparatus for protecting an automatic clutch from overheating, capable of holding down the generation of heat in the clutch even when the condition in which a traveling load at a vehicle starting time exceeds a predetermined level continues for a prede... | 09/03/2002 |
| 5649844 | Dual drive for power boats A drive system for a boat having a hull with an inboard motor and two spaced drive units mounted in the hull, including a dual drive package having a housing with first and second output shafts mounted in bearings in the housing and an input shaft mounted... | 07/22/1997 |
| 5569118 | Torque responsive release clutch mechanism A torque responsive release clutch mechanism for a pneumatic power nutrunner having a housing (16) with an air inlet passage (11) and an air motor (12). The clutch mechanism includes a driving clutch half (22) with pockets (33) for two or more torque tran... | 10/29/1996 |
| 5545109 | Torque limiter In a torque limiter, a ball pressing mechanism is provided to press a ball by a spring into a round hole having a smaller diameter than the ball formed at the end surface of an input member of the torque limiter main body. Accordingly, it is designed to a... | 08/13/1996 |
| 5505676 | Clutch torque control A clutch torque control features a plurality of clutch balls disposed between complementary races of input and output cams which are relatively axially displaceable upon the input cam rolling the clutch balls between matching cam peaks responsive to a dri... | 04/09/1996 |
| 5419745 | Torque release mechanism for an electronically powered tool Transmission between electric motor and tool shaft, for instance for hand tools such as an electric screwdriver and the like, which transmission is provided with an adjustable breaking coupling for discontinuing the drive torque on the tool shaft when a p... | 05/30/1995 |
| 5167309 | Torque Control clutch A torque control shutoff clutch for power tools is provided with a torque recovery camming device which assists in decoupling the applied power of the clutch along with the shutting off of the motor driving the power tool. The clutch permits automatic res... | 12/01/1992 |
| 5156244 | Torque sensing automatic shut-off and reset clutch for screwdrivers, nutsetters and the like An improved torque control and fluid shut-off mechanism for a fluid operated tool includes a driving clutch member and a driven bit holder connected by ball bearings retained by the clutch member which engages in pockets in the bit holder. The pockets inc... | 10/20/1992 |
| 5060771 | Adjustable automatic shut-off mechanism for lever or trigger controlled air tool A rotary vane air motor tool includes an adjustable torque sensing clutch which disengages the tool bit from the air motor and simultaneously closes a normally open valve to the air motor upon reaching a threshold value. A lever or toggle actuated normall... | 10/29/1991 |
| 5060772 | Power-operated tool The power-operated tool, preferably a screw driving implement, includes a switching clutch which transfers the torque from the drive shaft to the output shaft. Upon reaching the given reactive maximum torque, the switching mechanism is activated to turn o... | 10/29/1991 |
| 5054588 | Torque sensing automatic shut-off and reset clutch for screwdrivers, nutsetters and the like An improved torque control and fluid shut-off mechanism for a fluid operated tool includes a driving clutch member and a driven bit holder connected by ball bearings retained by the clutch member which engages in pockets in the bit holder. The pockets inc... | 10/08/1991 |
| 4635769 | Gear protection system for grinding mills A clutch is interposed between the driving gears of a grinding mill and the driving motor to protect the gears from damage by mechanical overloading. The clutch is set to slip at torques below those required to structurally damage the gears yet higher tha... | 01/13/1987 |
| 4556831 | Circuit arrangement for electrical tool with clutch In an electrical tool having a clutch for adjusting rotational torque of the driven shaft, a limit switch of double-throw type is used for detecting the state of the clutch, and a capacitor is arranged to be charged via the limit switch. In one embodiment... | 12/03/1985 |
| 4488604 | Torque control clutch for a power tool A power drive control unit of a torque control clutch for a fluid operated power tool features a latch, operable for initiating and interrupting motive fluid flow to a rotary fluid motor, and an actuator pin for controlling the latch. The latch is carried... | 12/18/1984 |
| 4429775 | Clutch type torque control device for air driver A clutch type torque control device characterized in that balls seated in ball receiving holes made in a main shaft are pressed against squarely planed-off surfaces made at the outer circumferential surface of a cam fitted to a driving shaft which is driv... | 02/07/1984 |
| 4265320 | Electrically powered torque-controlled tool An electrically powered torque-controlled tool having an electric motor which rotates a bit, whereby a screw, bolt or nut fitted at the front end of the bit is tightened. The tool is designed so that when the tightening force exerted by the bit reaches a ... | 05/05/1981 |
| 4199964 | Thrust transmission or thrust producing device A rotary torque transmission device has at least one pair of balls or rollers transmitting a torque load through respective contact points or lines with driving and driven members of the device and a contact point or line with each other. The contact poin... | 04/29/1980 |
| 4191282 | Device for tightening a screw joint A device for tightening screw joints, comprising a pressure fluid motor, an overload friction type slip clutch, a pressure fluid shut off valve and a release mechanism for initiating closing of said shut off valve at slipping of said overload clutch. The ... | 03/04/1980 |
| 4049104 | Power operated torque tool In a power operated torque tool, the pressure-fluid feed is controlled by a valve which opens to start the tool, and closes to stop it. This valve is mounted on the end of a push-rod which extends along the axis of the tool. The tool also has a clutch whi... | 09/20/1977 |
