Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4741217 | Magnetic field coupling circuit and rotary transducer using same An improved electromagnetic coupling circuit (16) is provided that features a rotor (18) carrying rotary windings (39) rotated by a rotary member (2) within an annular air gap (41) between two magnetic stator sections (34, 34') in which are disposed stato... | 05/03/1988 |
| 4700189 | Linear resolver A linear synchro/resolver comprised of an opposed pair of stator assemblies, each of which has a plurality of corresponding, opposed, toothed pole piece pairs, a toothed slider movably mounted between the opposed sets of pole piece pairs, and wherein the ... | 10/13/1987 |
| 4675638 | Ferromagnetic multiple shell core for electric coils A ferromagnetic multiple shell core for a plurality of electric coils has multiple recesses arranged concentrically with respect to one another and separated from one another by concentrically arranged side walls. A central core is provided at a center-po... | 06/23/1987 |
| 4612527 | Electric power transfer system An electric power transfer system in the form of a transformer comprises a first core portion 12 with two or more regions 14, and a second core portion 34 movable relative to the first core portion 12 and providing a low reluctance flux path between the r... | 09/16/1986 |
| 4610168 | Variable magnetic field coupling circuit and rotary transducer using same An improved rotary transducer (60) featuring a rotary member (2) rotatably mounted in a housing (4). Member (2) is preferably provided with a section (8) adapted to enhance measurement of stresses or other parameters of interest imposed upon member (2) un... | 09/09/1986 |
| 4567377 | Mechanical switching means for providing shunt calibration in a rotary transformer system A system for calibrating a strain gage transducer mounted on a rotating member comprising a mechanical switch capable of making contact from a stator to selected terminals on the rotor to provide both positive and negative shunt calibration of the transdu... | 01/28/1986 |
| 4517471 | Rotary converter machine for direct transfer of electric energy by flux linkage between windings on a stator pack A rotary converter machine which includes a stator with three-phase primary, and secondary windings, and a rotor mounted within the stator which includes a damping winding. The primary and secondary stator windings are arranged on a common stator pack and... | 05/14/1985 |
| 4458168 | Toothed reluctance synchro/resolver A synchro/resolver in which a plurality of primary windings and secondary windings are wound on separate stator pole pieces having projecting teeth, with the stator poles of the secondary windings being located between the stator pole pieces of the primar... | 07/03/1984 |
| 4446461 | Instrumentation for a rotary machine A rotor telemetry apparatus 60 for providing a data communication link between a rotating member 68 and a stationary member 66 of a rotary machine is disclosed. The rotor telemetry apparatus includes a pair of coils 72 each mounted on an associated member... | 05/01/1984 |
| 4430632 | Coaxial coupling and locking mechanism A coupling mechanism is disclosed for coaxially connecting a pair of connectable components, such as a pair of transducer assemblies each having a stator. A coupling ring is carried by one stator and engageable with the other for drawing the stators toget... | 02/07/1984 |
| 4412198 | Rotary transformer A rotary transformer such as for use in a torque-meter structure arranged to have reduced cross talk between the excitation and signal transformer portions, and to have improved durability. In the illustrated embodiment, the air gaps of the transformer se... | 10/25/1983 |
| 4327347 | Synchro An improved synchro including a pair of flats helically-coiled hairsprings (320,330) mounted between a rotatable rotor (100) and relatively fixed stator (200), said hairsprings being electrically conductive for carrying an electrical excitation between a ... | 04/27/1982 |
| 4323781 | Tomographic X-ray diagnostic unit with the secondary of the high voltage transformer rotating with the X-ray source In an exemplary arrangement a rotatable scanning system comprises an X-ray tube which emits a beam of X-rays which penetrates the layer to be examined, and a radiation receiver which supplies electrical output signals corresponding to the measured radiati... | 04/06/1982 |
| 4321572 | Non-contacting power transfer device A transformer (20) for coupling AC electrical energy from a stationary element (22) to a rotating element (24) without the use of sliding contacts. The transformer (20) is of the rotary type and includes a ferrite core (39) and two primary windings (70 an... | 03/23/1982 |
| 4213084 | Variable leakage transformer A variable leakage transformer or a variable voltage transformer comprising a magnetic core with a main magnetic path and a sub-magnetic path, the main magnetic path having at least a common magnetic path with the sub-magnetic path, a primary winding woun... | 07/15/1980 |
| 4167719 | Variable ratio transformer An adjustable output transformer using a pair of adjacent facing pot cores, the first of which carries both primary and secondary windings, the second having only a shorted winding around one leg. The shorted winding inhibits flux through its leg and the ... | 09/11/1979 |
| 4123736 | Leakage reactance transformer This specification discloses a leakage reactance transformer for supplying electric arc welding current and comprising a core formed from a stack of laminations having a central `key-hole` shaped opening punched therein and defining an arcuate core portio... | 10/31/1978 |
| 4117436 | Torqueless relatively moving transformer windings A transformer for coupling between relatively moving elements having a limited degree of motion without inducing torques or forces between the elements as the result of fluxes coupling transformer windings. The transformer includes a primary and secondary... | 09/26/1978 |
| 4060799 | Two-speed resolver employing differential reduction techniques A two-speed resolver system wherein the rotor of a fine brushless resolver which is directly connected to the shaft to be instrumented is connected to the rotor of a coarse resolver so that the rotor ofthe coarse brushless resolver rotates at a proportion... | 11/29/1977 |
| 4038624 | Rotary transformer A rotary transformer includes rotor and stator cores arranged apart from each other. The rotor core is made of a plurality of U-shaped core plates which are laminated around a rotary shaft and supported by a pair of plates engaged with the opposite side e... | 07/26/1977 |
| 4005396 | Digital displacement sensor with zigzag coils A digital displacement sensor includes a plurality of zigzag coils provided with projecting or convex portions having different pitches and arranged on the surface of a flat plate. A magnetic head consisting of a magnetic body and a coil is wound around p... | 01/25/1977 |
| 3976965 | Paired coiled conductors compact-long life A synchro having a rotor with windings supported by a shaft for rotation through an angle of approximately 360° relative to a stator in which the rotor windings are connected to external circuitry by leads each of which is formed into a coil with a strai... | 08/24/1976 |
| 3955166 | Pulse producing devices A pulse producing device has an E-shaped core with an input winding and an output winding, so that flow of flux between the limbs of the core produces an output in the windings. The flow of flux is controlled by parts rotating close to the limbs, and thes... | 05/04/1976 |
