Abstract: This torque limiting clutch has a motor driven hub carrying two concentric cup-shaped rings with a cylindrical permanent magnet therebetween. Keeper plates are pivotally secured to the hub and overlay coplanar edges of the rings to which the keepers are magnetically attracted. The hub has an extension on which freely rotates a power output disk provided with projecting fingers that engage the keepers when they are in radial positions with respect to the hub. When an overload is applied to the output disk, the fingers turn the keepers until they are disengaged from the disk. The power output disk and hub are thus released to turn freely independently of each other, without generating frictional heat therebetween.

Abstract: This dot assembly has a three-position rotor carrying dot display means for use as a portion of a matrix of dots in a variable message sign. The assembly has a stator including a support carrying reversely magnetizable separate magnetic cores on which are separate electrically energizable coils. The rotor which is carried by the support has a shaft rotated axially perpendicular to the cores. A permanent magnet on the rotor is adjacent to the cores to interact magnetically with them and rotate the shaft selectively to any one of three rotor positions. A single display disk having a peripheral display edge and two opposite display sides, or a unit of three disks having three exposed display sides, is mounted on the shaft for selective display of said edge or any one of the display sides in a viewing position.

Abstract: A torque limiting clutch having two or more cylindrical magnetic rings with coplanar edges abutted to a flat surface portion at one side of a magnetic driven member which may be a flat plate. The rings may be cylindrically round, or polygonal with flat sides. Between the rings are ring-like, cylindrical, arcuate, or flat permanent magnets conforming to the radial spacing of the rings and maintaining a magnetic circuit or circuits with the driven plate. A flat bar or other mechanical drive means engages the free other edges of the rings and is driven rotationally by a motor drive shaft or other driving means. The driven plate carries a driven shaft, or is adapted for engaging driven gear means or a driven pulley belt.

Abstract: A rotor for an electromagnetic indicator comprises a flat circular disk made of thin, pliable, nonmagnetic material. The disk has integral tabs extending out of diametrically opposite edges and a rib extends diametrically of the disk to outer ends of the tabs. The rib and tabs define T-shaped trunnions which engage in T-shaped slots in respective sides of a rotary magnet, and a journal block. The disk is fabricated from a single flat sheet having flat tabs extending outwardly of opposite edges. A V-shaped groove is made in the sheet extending centrally across the disk and tabs. Opposite sides of the groove are then brought together to form the rib with T-shaped trunnions at opposite edges of the disk.

Abstract: Apparatus for winding a coil or wire or thread on a C-shaped core structure where the coil width is greater than the gap through which it is being wound comprising, a stationary pedestal having a stationary base and upper platform. A first arm having a central slot engaging a stationary pin on the platform slides and turns angularly. A block and shaft are connected to one end of the arm and are reciprocated by a motor driven cam so that the end of the arm moves in a straight line. At the end of the arm is a post carrying an upper other arm which extends in cantilever fashion over the first arm. Jeweled bearings on the upper arm guide a wire to the rotating C-shaped core structure. The free end of the upper arm extends into a pole gap between ends of the core structure and moves with the lower arm in a straight line while the arms turn and slide on the pedestal, so that the coil is wound uniformly layer on layer on the rotating C-shaped core structure.

Abstract: An electromagnetic indicator has a stator carrying a stationary reversibly magnetizable core, and a rotor including a display disk and rotary cylindrical magnet. The magnet is permanently magnetized with two poles each angularly spaced apart less than 180.degree. at one side of a diameter of the magnet which also passes through the radially located core. Stop elements carried by the stator and core are engaged in each stopping position of the rotor when one of the magnet poles is attracted to, but held spaced from the magnetized core. The poles can be located to effect a turning range of the rotor from 120.degree. to 250.degree..

Abstract: A magnetic indicator assembly has a casing containing a stator comprising a reversibly magnetizable core carrying a wire coil. A rotor is angularly turnable around said casing through an angle of approximately 120.degree. to expose either one of two flags carried by the rotor on angularly disposed walls of a nonmagnetic member. The rotor carries a block supporting two coplanar, aligned bar magnets oppositely polarized. Either one of the magnets is attracted to the core depending on the polarity of the magnetic circuit as determined by the energization of the wire coil.

Abstract: A variable character display device includes a base plate on which is a multiplicity of variable segment display mechanisms. Each mechanism comprises a substantially flat display segment carried by a rotatable arm. A magnet secured to the arm is magnetically rotated by an electrically energized coil which creates a magnetic circuit through two magnetizable poles respectively disposed adjacent to opposite sides of the magnet. The mechanism is housed in a casing which is trapezoidal in axial section so that the display face of the segment is wholly concealed when the display segment is in retracted position. Abutments on a frame are used to stop rotation of the arm in a retracted position, and in a display position. The device dispenses with the usual face plate and mask so that the entire display faces of the segments are exposed when a character is displayed.

Abstract: The device comprises a body portion formed of a pair of substantially parallelly situated planar members spaced to receive the tab therebetween such that the interior surface of each member is parallel to and in engagement with the exterior surface of the tab adjacent therewith. In this manner, optimum heat transfer is achieved because the surface area of contact between the members and the tab is maximized by causing both sides of the tab to be in a heat conductive relationship with the device. Resilient connecting means situated at the ends of the members variably space the planar members with respect to each other such that tabs of different thicknesses can be accommodated and at the same time the parallel relationship between the members is maintained regardless of the spacing of the members to assure that the contact area is always maximized.

Abstract: An electromagnetic indicator assembly includes a nonmagnetic angle plate defining a support frame for axially parallel spaced rotors each including a permanent magnet and a nonmagnetic plate circumferentially surrounding a portion of the magnet. The rotors carry symbols for display at window openings in the support frame. Another angle plate made of magnetic metal has stamped laterally spaced integral fingers defining magnetic cores carrying magnetizing coils axially perpendicular to the rotors. Ends of the cores serve as abutments for spaced edges of the rotor plates to stop rotation thereof. Adjacent cores are oppositely magnetized and adjacent rotors are oppositely magnetized to prevent rotation of adjacent rotors when any one rotor is selectively turned to display a symbol.