Eaton Corporation

Cutler-hammer, Inc.

James H Bigelow

Jerome Kenneth Hastings

Earl T Piber

Gary R Schultz

Gordon B Spellman

James R Jaeschke

Walter L Rutchik

Werner B Halbeck

Robert L Pearson

James P Barcz

An electromagnetically actuated hydraulic switch unit is provided by an armature plunger which reciprocally shuttles between partially overlapping magnetic paths and operating a hydraulic valve circuit through bistable snap blade means. Snap blades open and close entry ports, exit ports and vent ports to connect various passages in a housing and perform given hydraulic functions. The ratio of the permeances of the two magnetic paths, created by dedicated coaxial coils, is controlled such that one path always overpowers the other by an amount greater than the mechanical gradients of a pair of snap blades in hydraulic fluid filled cavities, to insure plunger movement in either direction.

Electromagnetic hydraulic valve operator

An A.C. overload current sensing, remote power controller of minimum size and weight and integral construction. Current rate sensing wound toroids are used that are small enough to fit around the line terminal studs without having to enlarge the prior insulator space available therein. The electronic overload current detecting and tripping control circuit is replaced by a pair of modules, detector and control modules, having improved performance and a shape and size such that they fit within the relay housing alongside its operating magnet. The detector module has integrator means for converting current rate of change signals into current magnitude indicative signals thereby enabling use therewith of rate sensing wound toroids of about one-tenth the size of equivalent current transformer wound toroids. It fully meets the calibrated step function overload trip time requirements while also providing protection for unusual overload conditions such as varying overloads including pulse accumulation effects or repetitive reset, and simulates the response of a thermal element to prevent excess heating of the wire or load that it is protecting under any overload conditions. Moreover, one version of the control module incorporates a single standard CMOS IC logic element that provides a digital solution to the combinations of control conditions requirements while at the same time reducing the number of conventionally-required cutthroat contacts from two to one and isolating the control input from the relay power circuit. Another version provides reset lockout.

Minimum size, integral, A.C. overload current sensing, remote power

A high speed electromagnetically actuated electromechanical switch is provided by a bistable electric snap blade operated by an electromagnetic actuator. A magnetically permeable yoke directs the flux paths of a pair of coaxial coils. An armature plunger shuttles axially reciprocally in the coils between first and second positions. The snap blade has a pair of cantilever arms extending towards each other to engage the armature plunger in the gap therebetween for lateral flexing actuation. Energization of a given coil provides a primary flux path around that coil through the yoke and the armature plunger, and provides a secondary flux path around both coils through the yoke and the armature plunger. The primary flux path force around either coil is always stronger than the secondary path.

High speed electromagnetic mechanical switch

An electromagnetic actuator is provided by an armature plunger which reciprocally shuttles between magnetic paths having common overlapping portions through the plunger. A magnetically permeable yoke directs the flux paths of a pair of coaxial coils. When either coil is energized, a first flux path is created around that coil through the plunger and a second flux path is created around both coils through the plunger. The first path pulls the plunger to close an axial magnetic air gap. The second path holds the plunger in place. The ratio of the permeances of the two paths is controlled such that one path always overpowers the other, to insure plunger movement in either direction.

Shared flux reciprocal electromagnetic actuator

A chopper for adjustably controlling the average value of the voltage supplied from a D.C. battery source to a motor load for adjustable speed control. The chopper comprises manually-operable spring-biasing means for applying force to close a contact to energize the motor and electromagnetic means simultaneously energized for re-opening the contact. This occurs at a high repetition rate so that the average value of the voltage across the motor determines the motor speed. This average value of voltage is proportional to the closed-to-open time ratio of the contact and is adjustable by manual control. Two versions are disclosed. In the first version, the spring-biasing force is applied to the contact by depressing a trigger. In the second version, the spring-biasing force is applied to the contact by rotation of a knob. Both versions may use either tension or compression spring force.

Growing community of inventors

Milwaukee, WI, United States of America

James H Bigelow