Abstract: A magnetic recording medium comprising a non-magnetic support; at least one lower magnetic layer containing magnetic powder and a binder resin, which is formed on one side of the non-magnetic support with or without a non-magnetic primer layer interposed between the non-magnetic support and the lower magnetic layer; at least one non-magnetic intermediate layer containing non-magnetic powder and a binder resin, which is formed on the lower magnetic layer; at least one upper magnetic layer containing magnetic powder and a binder resin, which is formed on the non-magnetic intermediate layer; and a back layer which is formed on the other side of the non-magnetic support, characterized in that the magnetic powder contained in the uppermost magnetic layer of the upper magnetic layer is iron type magnetic powder which comprises substantially spherical or ellipsoidal particles with a number-average particle diameter of 5 to 50 nm and an average axial ratio of 1 to 2, each of said particles containing iron or containi

Abstract: A cross bar switching matrix for electric conductors in two sets has a first array of strips of magnetic metal mounted parallel on an insulating support plate with laterally projecting tongues from each strip the ends lying freely on the support plate. A second set of metal strips identical to the first set but at right angles thereto is mounted on a second insulating support plate. The support plates are juxtaposed with the strips perpendicular to each other and the free ends of the tongues of each set are opposed and form with a portion of each of the associated strips a ring which is substantially closed but for a thin layer of electrically insulating material in the areas where the strips of each array cross those of the other. Electromagnetic control circuits made up of electric control conductors are associated with a respective one of the strips and each electric control conductor includes a conductor linked with each of the rings formed by the tongues of the respective array strip.

Abstract: A circuit interrupter including a multipole circuit breaker and a multipole current-limiting reactor device. The multipole current-limiting reactor device includes an insulating housing forming a plurality of compartments, each compartment having a double-wound solenoid connected in series with one pole of the circuit breaker. The current-limiting reactor device limits the current through the circuit interrupter during overcurrent conditions to a value which can be safely interrupted by the circuit breaker.

Abstract: An arrangement for coupling the armature and contact-bridge carrier for an electromagnetic switching device, such as a relay which comprises an elastic interlay interposed between the contact-bridge carrier and the armature of the relay. The interlay is shaped substantially like the frustum of a cone. The first surface or base of the cone contacts the contact-bridge carrier, while the second surface or cut-off side of the cone frustum, contacts the armature. This arrangement, minimizes the lateral shock-loading of the contact-bridge carrier when the relay is switched off so that resulting mechanical moments are kept relatively small. Further, the arrangement provides an increased level of damping.

Abstract: A plurality of rigid members are utilized for connecting a yoke combination to a platform which is disposed on a television picture tube. The connecting members are shaped such that substantially constant physical contact is maintained between the connecting member, the yoke combination and the platform while the yoke position is adjusted. The yoke combination can be fixed into the optimum position in a permanent nonadjustable fashion through the use of ultrasonic welding or through the use of a small amount of adhesive material.

Abstract: An electrical magnet having at least one turn of electrical conductor which is continuously rippled in small radius arcs around is larger circumference. Each ripple in the conductor is formed to lie in a plane normal to the net magnetic field experienced by that ripple. For the special case of a planar turn of conductor, the ripples lie in substantially the same plane as the conductor turn itself. When current is flowing in the rippled conductor, the conductor will experience a magnetically induced force directed outward normal to the conductor. To oppose this outwardly directed force, the conductor is provided support by means which engage the conductor at the inner portions of the conductor between the ripples therein. The support means may consist of members or columns extending to a solid circular wall as, for example, a wall formed in bedrock.

Abstract: An improved circuit breaker comprises a thermal trip that comprises a current carrying bimetal, and a magnetic trip that comprises a magnetic yoke and armature supported on the bimetal with a multi-turn energizing coil supported on the yoke to enhance the magnetic tripping action.

Abstract: Individual wires in a winding are formed as polygons having contacting faces and noncontacting faces. Contacting faces of adjacent wires are positively engaged, while the noncontacting faces of adjacent wires form the periphery of openings that extend through the winding. Insulation may be removed from the noncontacting faces to facilitate cooling.

Abstract: A heat detecting conductor embodied in a flat tape wherein conductive strips in an open circuit are separated, at acceptable temperatures, by thermoplastic insulating material which is adapted to melt at predetermined elevated temperatures and to permit the conductive strips to come into contact with each other, thereby closing the electric circuit and actuating an audible and/or visual alarm. The heat detecting conductor may be associated with a cable carrying one or more service lines or with a cable connected to one or more heat detecting devices, as a back-up therefor, or may be used alone.

Abstract: A control device for an eddy current retarder having a plurality of energizing windings comprises an insulating support carrying a plurality of connecting terminals for connection to the retarder windings and a junction terminal for connection to one pole of a power supply. A plurality of contactors are provided for controlling the energizing of the retarder windings, each contactor corresponding to a connecting terminal and comprising first and second fixed contact members, a bridge contact co-operating with the first and second fixed contact members, and a pull-on contactor winding controlling the bridge contact. A first contact plate connects the first contact member of each contactor to the corresponding connecting terminal and a second common contact plate connects the second contact members of the contactors to the junction terminal. Each contactor winding is connected to a respective control terminal which is connected to a control selector for consecutively energizing the control terminals.

Abstract: An electromagnetic force applying device comprises a core with an annular air gap, a coil for creating a radial magnetic field in the air gap and an armature ring movable axially in the air gap. The core and the ring are of different magnetic materials with different coefficients of thermal expansion so that the force applied to the ring when a given current flows through the coil varies with temperature.

Abstract: A circuit breaker designed for automated assembly includes pairs of fixed and movable contacts, the latter carried by a carrier mounted for reciprocating movement in the breaker case. Operating and trip mechanism parts are mounted on a frame positioned in the case. A handle slideably mounted by the case actuates the operating mechanism to open and closed circuit positions. A fixture is utilized with the frame for calibrating the thermal trip setting and for partial assembly of the operating mechanism.

Abstract: An electric switch is disclosed in which the swingable arms intended to approach and separate the fixed and movable contacts are a part of a linkage containing fixed and slidable pins, so that an overcurrent exceeding a preselected limit causes the contacts to be opened without rebounds. The existing, or specially provided clearances between the component parts of the linkage are exploited for providing yieldable end of stroke abutments for absorbing the shock of the contact-carrying arm.

Abstract: An electromagnetic matrix switch device, suitable for use in an automatic exchange or computer, comprising a two-dimensional array of cross-point elements, each of which comprises a magnetically actuated switch adapted to bridge its associated pair of row and column signal lines and a magnetic core positioned in magnetically-coupled relationship to the switch to actuate it in response to a current pulse applied to its associated pair of row and column control lines. Each magnetic core has provided therearound first and second windings connected to its associated row control line and third and fourth windings connected to its associated column control line, the polarity of those windings being such that application of the current pulse to the row and column control lines will cause the first and fourth windings to produce magnetic fields in a direction opposite to those produced by the second and third windings.

Abstract: A magnetic core construction for solenoids or electromagnets, comprising a plurality of unique magnetic laminations adapted to be stacked one on another into a pile. The laminations have interlocking means whereby, when stacked in a certain manner, the pile formed thereby constitutes a loose assemblage which cannot readily be dismantled. Also, such assemblage has the important feature that the adjoining laminations can all be spaced from each other a predetermined extent or else completely and tightly brought together into a compact mass. Means are provided for connecting a drive or linkage member to an end lamination whereby the forces involved in bringing together the laminations can be harnessed to produce useful output or work which is characterized by a more gradual build-up of the output force. The compacting of the assemblage is effected by the application of magnetic flux thereto, as by energizing a magnet coil of insulated wire, operatively associated with the laminations.

Abstract: The invention relates to hermetically sealed contacts, electromagnetic devices using such contacts, as well as method and means for controlling such electromagnetic devices.

Abstract: A circuit breaker comprises improved thermal and electromagnetic trip means comprising a currrent carrying bimetal operable upon the occurrence of lesser overloads to effect time-delay thermal tripping operations, and electromagnetic means energized by the current in said bimetal which electromagnetic means is operable upon the occurrence of more severe overloads to effect instantaneous electromagnetic tripping operations.

Abstract: A miniature type hermetically sealed electrical switch that provides snap-action contact reversal with magnetic contact holding. The only moving part of the switch is a mechanically unattached permanent magnet button-contactor member that reciprocally moves under the influence of an external permanent magnet actuator member to cause reversal snap-action contact of a previous magnetically-maintained contact condition.

Abstract: The mount comprises a first portion adapted for receiving a yoke, a second portion adapted for connection to a cathode-ray tube, a plurality of adjustable springs interconnecting the first and second portions and means for locking the first and second portions together. The adjustable springs permit movement of the yoke along one axis while securing its position along an orthogonal axis. In one preferred embodiment, a platform is provided with projections extending therefrom. A housing on which a yoke may be mounted, is attached to the projections. The housing includes a plurality of bow springs located between the points of attachment to the projections and the yoke attachment area. Means also are included to secure the bow springs in their adjusted positions.

Abstract: A multi-pole circuit breaker with adjustable thermal trip unit characterized by a circuit breaker mechanism having a plurality of pole units, means releasable when released from a latched position to effect simultaneous opening of the circuit breaker contacts, a multi-pole trip device including trip means for each of said pole units, each of said trip means being constructed to operate upon the occurrence of certain current conditions to effect release of said releasable means, and each pole unit comprising a bimetal element responsive to current flow to effect heating thereof.