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Actodyne General, Inc.

Donald A Lace

Dorothy Lace

A dual coil pick-up assembly for a stringed musical instrument having a plurality of moveable strings includes a case having a longitudinal channel with first and second sections. The pick-up assembly also includes first and second magnet structures disposed in the first and second sections having opposite polarities and a coil structure disposed in the first and second sections of the channel for eliminating hum in the pick-up assembly due to stray magnetic fields.

Dual coil pick-up assembly for a springed musical instrument

A mounting assembly for a pick-up of a stringed musical instrument includes at least one mounting stud connected to a case of a pick-up and a disc disposed about the mounting stud for dampening vibrations. The mounting assembly also includes a mounting bracket structure disposed adjacent the disc and operatively connected to the mounting stud for attaching the pick-up to a stringed musical instrument.

Mounting assembly

Pick-up assembly for a stringed musical instrument

An electromagnetic pickup for use in sensing the mechanical motion of strings includes a ferromagnetic housing of elongate, longitudinally recessed form in which a ferromagnetic core is received. The core includes a plurality of coplanar, spaced, finger-like projections directed at the walls of the recess. Both the walls of the recess and the finger-like projections of the core are permanently magnetized to a common magnetic polarity and thus will concentrate by magnetic repulsion the flux into the gap between the projections. A coil wound around the core then senses the flux changes of these concentrated flux fields due to string motion.

Magnetic field shaping in an acoustic pick-up assembly

A high lift check valve resistant to the flow of abrasive containing fluid therethrough, which valve may be transformed to also act as an excess fluid control valve.

Check valve structure

An electrically operable actuator capable of being secured to a valve body to control the flow of fluid therethrough by the movement of a spring-loaded valve member supporting armature. The spring-loaded armature, at all times, tends to move to a first position where the valve member is in sealing engagement with a valve seat and flow of fluid through the valve body is obstructed. The actuator includes a permanent magnet and solenoid, each of which provides a separate source of magnetic flux. The armature is formed from magnetic stainless steel or other material having substantial permeability and low magnetic retentivity. When the magnetic flux from the permanent magnet and solenoid flow in the same direction relative to the armature, the armature is moved from a first fluid flow obstructing position to a second non-fluid flow obstructing position, and thereafter removably held in the second position by magnetic flux from the permanent magnet. When the magnetic flux from the permanent magnet is nullified, the spring moves the armature from the second to the first position.

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Huntington Beach, CA, United States of America

Donald A Lace