Abstract: A fault indicator for detecting the occurrence of a fault current in a monitored conductor includes a rotatably mounted indicator flag. The flag is positioned in either a reset indicating or a fault indicating state by a magnetic pole piece, which is magnetized in one magnetic direction or the other by momentary application of a current in one direction or the other to an actuator winding on the pole piece. An auxiliary magnetic circuit comprising an auxiliary pole piece magnetized by the actuator winding, a reed switch and a bias magnet magnetically aligned to oppose the reset magnetic orientation and reenforce the trip magnetic orientation of the magnetic pole piece provides contact closure upon occurrence of the fault current.

Abstract: An electrical meter, comprising a housing, a motor magnet mounted relative to a housing for pivotal movement, and an induction clip having an arcuate portion of more than 180 degrees, opposite ends of the arcuate being anchored to the housing to define an area within which a conductor is maintained within the radius of the arcuate portion.

Abstract: A modular meter movement having two or more coil assemblies. One embodiment of the meter is modular and includes coil assemblies that are formed as separate parts and configured to be attached to a magnet housing that houses a rotatably mounted permanent magnet. The magnet housing includes a plurality of arms that can accept either two or three coil assemblies depending upon the embodiment. The coil assemblies are placed over the magnet housing such that the coil assemblies at least partially surround the magnet housing. The magnet housing and coil assemblies are placed within a shield pot formed from a magnetically susceptible material. In one embodiment, the shield pot is non-cylindrical and the axis of rotation of the permanent magnet is mounted off the central axis of the shield pot. The shield pot is shaped so that even though it is non-cylindrical, it does not induce a homing position in the resulting meter.

Abstract: A vane-type galvanometer employs a stator having a unibody type structure. Narrow bridge regions of the stator are magnetically saturated to produce regions of high magnetic reluctance and salient magnetic poles in the stator. A pre-wound bobbin is mounted to the stator for generating a control flux to thereby exert a torque on a vane armature.

Abstract: A first magnet is mounted for rotation near a cavity of a magnetizable body such that the first magnet has a null position influenced by magnetic interaction between said first magnet and at least two pole pieces of the magnetizable body. The magnetizable body has a core associated with a source of magnetic energy to induce magnetism within the core and the pole pieces and thereby alter the null position of the first magnet. Various embodiments of the invention include: analog meter mechanisms; actuators; transducers; proximity and position indicators; and other devices.

Abstract: The electrical measuring meter comprises a polarized motor magnet mounted for movement to and from a starting position, a polarized holding magnet operative magnetically to influence the motor magnet constantly towards such starting position, and a calibrating element magnetized by the holding magnet to effect a partial cancellation of the holding magnet's influence on the motor magnet as is needed for calibration. The calibrating element preferably is in the form of a soft iron circular disc, and soft iron discs of different sizes are used to calibrate the meter for respective different maximum scale current values. Also, the high magnetic permeability of the soft iron disc enables the use of a rugged and economical sleeve bearing mount for the motor magnet even in a meter calibrated for low current measurement.

Abstract: A reinforced bobbin which when wound with a sensing winding forms the armature of a D'Arsonval movement measuring instrument. The reinforced bobbin consists of a thin elongated open rectangular bobbin with detent holes centered along the axis of revolution of the bobbin in the measuring instrument. A nonmagnetic low density ball with a diameter slightly larger than the opening in the bobbin is locked in position inside the bobbin by the detent holes to prevent inward deformation of the bobbin when the measuring instrument is subject to rough handling.

Abstract: A measuring mechanism for a wide-angle moving coil measuring system and a method for its assembly. The mechanism includes concentrically arranged inner and outer pole rings. The rings terminate in arms between which a slot or spacing is arranged. The spacing is accessible from outside the mechanism in which spacing is a pre-assembled movable part having an axle or two axle-stubs, and moving coil frame is inserted into the internal space of the inner pole ring. The magnets are arranged to be positive-locked with the pole rings. Two arrangements of magnets cooperating with the pole rings are disclosed. Various embodiments and methods of assembly are disclosed.

Abstract: A meter reader assembly is adapted for mounting on a standard utility meter having a plurality of rotating dial elements for visually indicating total units of the utility consumed. The assembly includes a magnetic reed switch fixedly mounted adjacent the single meter dial element which indicates the lowest whole unit of utility volume consumed, and one or more permanent magnets mounted on this single dial element in a position to traverse the reed switch each time the single dial element rotates through a distance to indicate the consumption of a single whole unit of utility. The reed switch opens and closes each time it is traversed by a magnet to produce an electrical pulse in a logic circuit which also contains a summing circuit for totalling the pulses, and a shift register memory.

Abstract: A magnetic rotary encoder for detecting the absolute value of an angular displacement using magneto-resistors is disclosed. A drum, disk or cup-shaped rotary member is attachable to a rotatable shaft. A magnetic medium divided into a plurality of tracks is provided on a surface of the rotary member. Each of the tracks produces magnetic fields changing in magnitude and direction as the rotary member revolves. Alternatively, a plurality of permanent magnets are provided on the surface of the rotary member to produce the alternating magnetic field as the rotary member revolves. A plurality of magneto-resistors are provided in the vicinity of the rotating paths of the tracks and produce analog signals indicative of changes in their electrical resistances. A rotary condition detector receives the analog signals and produces digital signals and/or an analog signal indicative of the angular distance moved by the rotatable shaft in an absolute value.

Abstract: Apparatus for detecting defects such as fissures in the ferrous metal of elongated workpieces such as pipe may take the form of wall thickness and material continuity inspection apparatus that is located at an inspection site, with the inspection site being provided to receive an elongated metal workpiece such as a section of drill stem. A movable magnet support structure is located at the inspection site and carries a magnet and coil assembly in movable shoe means that is capable of engaging the outer periphery of the workpiece and establishing a predetermined spaced relationship between the workpiece, the magnet and the coil. The magnet support shoe, together with the magnet and coil, are movable in helical manner about the workpiece, causing the shoe to traverse the entire outer periphery of the workpiece during a single inspection pass.

Abstract: Adjustment of the zero point of an instrument is achieved by rotation of a rotary element extending through the casing of the instrument. The rotary motion of the rotary element is translated into a lateral motion of an intermediate adjustment element. The lateral motion is a side to side motion within the instrument relative to the sides of the instrument casing. The lateral motion of the intermediate element is in turn translated into a pivot motion of a suspension element of the instrument. The pivoting of the suspension element causes deflection and adjustment of the indicating element of the instrument from which readings of the instrument mechanism are taken.

Abstract: An improved multi-channel galvanometer assembly is disclosed particularly well adapted for use in such instruments as electroencephalographs and the like. The assembly includes a soft steel combination return path structure and frame supporting a plurality of galvanometer movements. The design employs pairs of samarium cobalt magnets held in place adjacent and on opposite sides of the coil of each galvanometer by magnetic attraction to the steel return path structure. The galvanometers themselves are each mounted on an aluminum support plate which also serves as a shield to prevent magnetic coupling between adjacent galvanometer coils when the galvanometers are assembled in the support frame. The galvanometers on their support plates are each individually removable and/or replaceable. The result is a lighter, smaller, multi-channel galvanometer assembly which is readily expandable and easily serviced.

Abstract: A galvanometer mechanism including a circuit board having an electrical circuit printed thereon and defining a plug portion for insertion into a galvanometer control console receptacle. The circuit board further includes a magnet fixed thereto. A torsion bar secured between legs of the magnet supports an electrical coil which is responsive to an applied signal and is operatively connected to printing apparatus.

Abstract: A moving coil instrument with a unique base of nonmagnetic sheet metal construction so arranged that sides of the base can flex to receive and clampingly retain a magnetic circuit, without causing movement of end portions of the base which support the moving coil for pivotal movement. Projections of a casing cooperate with circular mounting ears on the sides of the base to exert an inward force to assist the clamping action of the sides to securely hold the magnetic circuit against movement. A unique unitary sheet metal balance cross and a terminal plate assembly provide for connecting inner ends of taut bands which support the coil for movement. Cooperating tabs and slots on the coil, balance cross, and terminal assembly provide for securing the terminal plate and balance cross at opposite ends of the coil in predetermined locations with respect to the coil.

Abstract: A long-scale meter movement of the type in which one leg of the moving coil oprates within an annular gap between an outer pole and a cylindrical core. In the new meter movement, the outer pole is integral with the return ring, in a generally circular configuration. The coil support frame is likewise of unitary construction, with a central portion extending through the return ring in the region of the magnet block and having integral coil pivot supports front and rear. The central frame portion has an aperture for the magnet block, with separate supports for the core extending through the aperture in interlocking relation with the frame. The construction of the parts is such that the frame, coil, core and magnet may be fitted together to form a subassembly which is inserted as a unit into the one-piece outer pole and return ring.