Abstract: Devices for detachable attachment to a ferromagnetic object and/or surface are disclosed. The device may comprise a core housing defining a pocket, a magnet disposed in the pocket, and a baseplate fixed to the magnet sheet assembly. The baseplate may include a pivot portion that engages a corresponding portion of the core housing to form a hinge joint such that the baseplate and the magnetic sheet assembly selectively pivot about a pivot axis of the hinge joint relative to the core housing. The camming mechanism may apply a camming force to a portion of the baseplate and the camming force may urge the magnet and the baseplate to pivot about the pivot axis of the hinge joint.

Abstract: A method for creating and a device for a rotary switchable multi-core element, permanent magnet-based apparatus, for holding or lifting a target, comprised of two or more carrier platters, each containing a plurality of complementary first and second core elements. Each core element comprises permanent magnet(s) with magnetically matched soft steel pole conduits attached to the north and south poles of the magnet(s). Core elements are oriented within adjacent carrier platters such that relative rotation allows for alignment in-phase or out-of-phase of the magnetic north and south fields within the pole conduits. Aligning a first core element “in-phase” with a second core element, that is, north-north/south-south, activates that core element pair, allowing the combined magnetic fields of the pole conduits to be directed into a target. Aligning the core element pair “out-of-phase,” that is, north-south/south-north, deactivates that core element pair by containing opposing fields within the pole conduits.

Abstract: A layered electrical resistor having flat components stacked as follows: a first metal outer plate, a first thin outer electrical insulator, a first thin sheet metal resistor element, a first thin inner insulator, a metal midplate, a second thin inner insulator, a second thin sheet metal resistor element, a second thin outer insulator and a second metal outer plate. The stacked components are compressed together by rivets or otherwise. Each sheet metal resistor element is stamped, punched or otherwise cut with at least first and second terminals and interconnected ribbons forming a resistive path therebetween. A thermal fuse or other circuit breaker is thermally engaged with a seat on the midplate and is connected in a series circuit with the resistor elements to open the circuit to prevent overheating thereof. Structural tie bars are formed integrally with ribbons and terminals of the resistor elements and are severable therefrom before assembly of the components.

Abstract: A surface mounted thin film precision voltage divider is provided by incorporating two resistors on a single base of the same size and configuration as prior art surface mounted thin film precision resistors. Because the resistors were made at the same time, using the same materials and under the same conditions, the resistors react substantially equally to changes in temperature, aging, thermal shock, short time overload, high temperature exposure, resistance to bond exposure, moisture resistance, load life and low temperature operation. The voltage divider replaces two conventional surface mounted thin film precision resistors at a fraction of the cost.

Abstract: An integrated circuit resistor array suitable for use as resistors included in a high performance analog integrated circuit is provided. A plurality of resistor stripes are collectively arranged in a region on a substrate. The resistor stripes are made of the same material and designed to have the same cross-sectional area. The resistor stripes are electrically connected through first metal layer conductors. Second metal layer conductors connect the stripes to external circuits. Different resistors have matched voltage dependencies.

Abstract: A surge protector, particularly for protecting components in a telecommunication system, has a thin ceramic substrate on a surface of which is formed a surge protector resistor having a spiral pattern in the form of a double spiral having two parallel resistor paths in series, the width of the paths and the distance between adjacent path lengths being relatively narrow. Resistance trimming links are provided for increasing the length of a resistor path, there being substantially even distribution of surge effects under surge conditions.

Abstract: The invention relates to a method of manufacturing a heating element from a flat metal foil blank in which strips (1) are formed whose ends (2) are interconnected by connecting portions (3, 4) with alternate connecting portions disposed at opposite ends of the strips so as to form a meandering pattern and to a heating appliance incorporating such a heating element. In order to make such a foil heating element suitable for use in appliances in which an air stream to be heated passes over the foil heating element the connecting portions (3, 4) are bent in such a way that the strips (1) are tilted out of the plane of the foil blank. Preferably the strips are disposed an an angle .alpha. between 45.degree. and 90.degree. relative to the plane.

Abstract: A surge protector, particularly for protecting components in a telecommunications system, has a thin ceramic substrate on a surface of which is formed a surge protection resistor having a serpentine path extending over the substrate, the width of the path and the distance between adjacent path lengths being relatively narrow. Resistance trimming means are provided, positioned such that there is a substantially isothermal heat distribution over the substrate under surge conditions.

Abstract: An improved heating apparatus for heating a small room or confined space has an electric heater element affixed to a mounting frame assembly by means of notched heater element supports. The notched heater element supports are operably disposed within slots located around the periphery of the mounting frame assembly. When the heater element is strung through the supports, and stretched therebetween, the supports are biased into a locked position. Cool air is drawn through louvers located in the side panels of the upper housing portion and blown through the mounting frame assembly by a fan located at the rear of the apparatus housing. The cool air is warmed by the heater element and warm air is blown through a front grill attached to the front panel of the apparatus housing.

Abstract: A step adjustable attenuator comprising a silicon substrate on one face of which are deposited thin film-type resistors and electrical conductors by which the resistors are interconnected. Contact points are arranged at the periphery of the substrate and connected to the resistors. However, the attenuating sections are not interconnected on the substrate. A conductive pattern prepared from a conductive film forms finger-like leads of which inner portions are bonded to the contact points. By its shape, the pattern ensures the interconnections between the sections and forms two rows of outputs, one for the connections on the printed-circuit board on which is implanted the attenuator and the other being associated with displaceable straps enabling attenuation to be adjusted.

Abstract: In a ceramic heating element comprising a ceramic substrate having on a surface thereof a resistor pattern of an electrically conductive material and a ceramic electrically insulating layer disposed on the surface of the ceramic substrate with the resistor pattern thereon, the improvement wherein the ceramic electrically insulating layer includes an opening, the resistor pattern exposed by the opening in the ceramic electrically insulating layer being electrically shorted and/or an electrical short-circuiting path previously provided in the resistor pattern being cut whereby the resistivity of the resistor pattern is adjusted to within a particular range, and a heat resistant electrically insulating coating filling the opening in the ceramic electrically insulating layer.

Abstract: A heating element assembly having a thermally conductive ceramic top sheet against the underside of which is positioned a thermally and electrically insulating base pod having a recess containing a loosely secured, planar array of thin, flat strips of apertured, foil-like, electrical resistance material. The array is spaced from the ceramic sheet a predetermined distance and disposed in such a manner as to provide a large amount of heat radiating surface adjacent to the underside of the ceramic top. The spacing between the array and the ceramic top sheet enhances even radiant heating of the ceramic top. Such a heating element assembly is low in cost and high in thermal efficiency, having particular utility as a burner for a ceramic top electric range.