Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 7834564 | Actuating device for motor vehicle components A device for actuating components of a motor vehicle has at least two electric motors, each of which has at least one stator unit and one rotor unit, and a control device for the electric motors, which has at least one logic device and one power device. The control ... | 11/16/2010 |
| 6633143 | Reactionless rotary drive mechanism An articulating probe head includes motors 12 and 18 for driving respective output shafts 14 and 20 about respective orthogonal axes z and x to move a stylus 22 over the surface of a workpiece under the control of a controller 26. At least one of the moto... | 10/14/2003 |
| 6310455 | Positioning and actuating drive An electric motor, gearbox, position phase angle sensor and motor phase angle sensor are integrated in a common housing to reduce the size of a positioning and actuating system. The housing also includes electronics for detecting and processing the signal... | 10/30/2001 |
| 6153988 | Arrangement for operating an electromagnetic brake of a vehicle An arrangement for operating a brake of a vehicle has a controllable operating electric motor and a conversion device for converting the rotational movement of the operating electric motor into a translational movement of one or several brake element(s) w... | 11/28/2000 |
| 5473238 | Disc drive power management system A disc drive circuit includes a pair of DC busses across which are directly connected a disc actuator power amplifier and a three phase spindle motor power amplifier which may be comprised of three circuit branches, each branch having two NMOS transistors... | 12/05/1995 |
| 5426353 | Synchronous motor system employing a non-synchronous motor for enhanced torque output A rotary actuator derives its power from a synchronous motor preferably of the AC type providing constant output speed, and from a non-synchronous motor, preferably of the DC type, in a helper capacity to provide additional torque for a load. Use of certa... | 06/20/1995 |
| 5400303 | Driving device for timepieces The driving device comprises two single-phase stepping motors (1, 2), each having a different preferential direction of rotation. The bidirectional drive is achieved by selectively feeding one or the other of the two motors.... | 03/21/1995 |
| 5182498 | Spring return rotary actuator A rotary actuator uses a two degree of freedom gear train with three torque members to provide torque to the output element from a first torque member. The torque is supplied to a second torque member from a drive motor. A torsion spring on the third torq... | 01/26/1993 |
| 5045767 | Rotating display element and display unit using the same A rotating display element which is provided with a display surface member having four display surfaces which are selected by rotating the display surface member, and a display unit which uses the display element. The display surface member has incorporat... | 09/03/1991 |
| 4984126 | Method and circuit for stopping the test run of a rotor being balanced A method and a circuit arrangement for stopping the test run of a rotor being balanced, in particular a rotor for a motor vehicle wheel. Upon the application of an armature disk of an electromagnetic brake to a friction lining, the electromagnet coil of t... | 01/08/1991 |
| 4695016 | Slow motion actuating device A slow motion actuating device has a housing with a first opening therein through which an output pin extends. The output pin is connected to a swing arm which is pivotally mounted in the housing and driven by a set of reduction gears. Stops are provided ... | 09/22/1987 |
| 4677355 | Electric-powered spring-return actuating device Electric-powered actuating device usable for the positioning control of valves and the like, featuring a motor, mechanical and spring means capable of driving said valve or other attached devices into a predetermined safety position in case of electrical ... | 06/30/1987 |
| 4636697 | Copying apparatus equipped with brushless DC motor A copying apparatus equipped with a brushless DC motor for driving a light source, a photoreceptor drum, etc. and including a motor locking circuit for locking the DC motor. The motor locking circuit, when an external force has been applied to a rotor of ... | 01/13/1987 |
| 4613798 | Electric-powered spring-return actuating device Electric-powered actuating device usable for the positioning control of valves and the like, featuring a motor, mechanical and spring means capable of driving said valve or other attached devices into a predetermined safety position in case of electrical ... | 09/23/1986 |
| 4558267 | Rotating display element and display unit using the same A rotating display element is provided with a display surface structure which has a plurality of display surfaces and is mounted on a rotor of a permanent magnet type stepping motor mechanism in a manner to incorporate therein the stepping motor mechanism... | 12/10/1985 |
| 4467250 | Electric motor controls for mechanical actuators Methods and apparatus for controlling an electric motor effect operation of such motor by electric energization thereof, and derive from a motor winding or from the back electromotive force of the motor an electric signal indicative of motor speed. The mo... | 08/21/1984 |
| 4227347 | Two motor drive for a wafer processing machine A drive mechanism for a wafer processing machine of the kind which holds a silicon wafer on a vacuum chuck and rotates the wafer for processing operations on the wafer periphery or upper surface incorporates a low-speed motor, a high-speed motor and an ov... | 10/14/1980 |
