Abstract: A print wire actuator using a telescopic armature pair is presented. The actuator is disposed to propel a print wire through a predetermined distance from a rest position toward a recording medium. The armature pair moves by electromagnetic force over a first portion of the predetermined distance at which point one piece of the armature reaches a mechanical stop. The second piece of the armature continues to move, both ballistically and magnetically, over the remaining portion of the predetermined distance.

Abstract: A solenoid-type print wire actuator includes a unitary one-piece bobbin formed of a magnetically permeable material and having two axially spaced-apart annular grooves in the outer surface thereof. An electromagnetic coil is wound on the bobbin. A dumbbell-shaped armature is disposed coaxially within the bobbin and is connected to the print wire for axial movement thereof, the armature having two cylindrical piston portions respectively disposed adjacent to the bobbin grooves. The ends of the bobbin are respectively supported in bores in the leg portions of a U-shaped member, the leg portions being interconnected by another piece to form a frame of magnetically permeable material to define a flux path.

Abstract: An electromagnetic activation device for valves using a hinged armature magnet. The hinged armature itself is attached to the free end of a leaf spring fastened on one end on the magnetic body and extends into the magnetic body. This leaves at least two guide air gaps (S.sub.1, S.sub.2) with specified measurements. In this manner an advantageous magnetic efficiency with only minimal friction losses is achieved and the electromagnetic activation device can be used advantageously with anti-blocking control devices in motor vehicle brake system.

Abstract: A linear solenoid device comprises a cylindrical armature or plunger freely movable within the central opening of a stator which comprises a cylindrical coil wound between a pair of annular end pole members and surrounding one or more intermediate annular pole members. The intermediate pole members are axially spaced and aligned with the end pole members by a bobbin which preferably is injection molded. The armature has plural axially spaced and aligned annular pole members concentrically arranged within the central opening of the single cylindrical coil. The magnetic stator and armature poles take the form of rings which are dimensioned and arranged so that the magnetic flux generated by the coil passes in a series path alternately from the stator to the armature rings and then through a cylindrical magnetic casing which forms a magnetic flux path between the end pole members. The armature includes a support body of non-magnetizable material which may be plastic and can be injection molded.

Abstract: An electromagnetically operated valve unit includes a casing of magnetic material having inlet and outlet ports, a support shaft of non-magnetic material fixed in position within the casing and provided at its one end with an axial bore coaxial with the outlet port and an axial hole formed in the peripheral wall of the bore to provide fluid communication between the inlet and outlet ports, a plunger of magnetic material in the form of a sleeve member axially slidable on the support shaft and cooperating with the axial hole to open and close the fluid communication, a coil spring for biasing the plunger in one direction to normally close the axial hole, a tubular yoke of magnetic material surrounding the support shaft and facing at its inner circumference to the outer circumference of the plunger with a predetermined annular clearance, and a solenoid coil wound around the tubular yoke.

Abstract: An electromagnetically driven device has a bobbin made of non-magnetic material and has an opening formed in its axial direction. A coil is wound on the bobbin for establishing a magnetic field inside and around the bobbin when electric current is supplied to the coil. A plunger made of magnetic material is inserted into the opening for movement in its axial direction. A magnet is attached to one end of the plunger for increasing the driving force of the plunger when electric current is supplied to the coil.

Abstract: An electromagnetic device includes a stator having first and second closed flux-carrying paths defined by first and second cores, each having a plurality of concentric cylindrical pole surfaces and each defining an air gap opening between the outermost of the pole surfaces and the second outermost of the pole surfaces, with each core having at least one further pole surface. Coils are provided for generating electromagnetic flux in the first and second closed flux-carrying paths with the direction of flux flow across the air gaps being substantially radial with respect to the cylindrical pole surfaces. An armature defines a first and a second plurality of concentric cylindrical armature surfaces. The armature is mounted to be movable in a direction substantially parallel to the pole surfaces with each of the first and second cylindrical armature surfaces overlapping a corresponding one of the concentric cylindrical pole surfaces by an area dependent upon the position of the armature.

Abstract: In a solenoid switch, a cylindrical externally threaded housing having an integrally formed bottom wall with an axially centered aperture, a solenoid coil disposed axially within the housing with upwardly extending leads, a plunger within the coil having an actuator pin extending downwardly through the aperture, a cover of plastic material on the housing embedding a pair of connectible terminals each of which is connected to one of said leads, whereby as electrical energy is transmitted to the terminals the coil will be energized to move the plunger axially so that the pin may perform a desired work outside of the housing.

Abstract: A print wire solenoid for high-speed operation is made with two major components or subassemblies. The first is a plastic injected unitary bobbin or stator assembly which incorporates a core ring and a core, and a stator which forms a bobbin for receiving an electric coil. The parts in the stator are positioned and molded to a datum surface. The second major subcomponent is a unitary armature assembly which incorporates an armature, a retraction spring, and a print wire, all anchored to a plastic body. These parts are likewise positioned with respect to a datum surface. The stator assembly and armature assembly are retained within a drawn metal case, and a rebound disc is positioned within the case and locates the datum surface of the armature assembly in the same plane as the datum surface of the stator assembly so as to define an accurate working air gap.

Abstract: A solenoid operable from an alternating voltage source is disclosed and the solenoid may actuate a fluid valve with the fluid of the valve wetting the movable armature inside a barrel. The barrel is sealed against fluid leakage at all places except the axial end connected to the valve. A frame is coaxial with the barrel and encloses an electrical coil. A magnetically permeable core is inside the barrel and fixed relative to the frame and this core carries a first pole piece. A second pole piece is on the movable armature for cooperation with the first pole piece. The electrical coil is energized with rectified voltage from the alternating voltage source and this together with the shape of the pole pieces establishes a controlledsaturation of these pole pieces in a range of positions of the armature. This saturation of the pole pieces is established so that the saturation decreases as the armature moves from a first extended position toward a second closed position.

Abstract: A solenoid valve for fluid flow control, in which the solenoid has an armature movable within a core in response to current in a field coil. The armature is shaped as a cone with a hemispherical end so as to give a power output that is a substantially linear function of said current. Valve control means connects a valve member to the armature for moving the valve member to and from a valve seat to control fluid flow therethrough.

Abstract: The load-bearing surface of a laminated plunger in a solenoid is provided with an embedded reinforcing material harder than the laminated plunger. The reinforcing material is made integral with the laminated plunger, by friction welding, only by a thin boundary layer between the contacting surfaces of the laminated plunger and the reinforcing material.

Abstract: An electromagnetic device includes a stator having a first closed flux carrying path including a core and an air gap opening in the core. Flux is generated in the flux carrying path by a coil, with the direction of flux flow across the air gap being perpendicular to pole surfaces defining the air gap. An armature is mounted to be movable between the pole surfaces and to overlap varying areas of the pole surfaces in dependence upon the position of the armature. The overlap areas are directly proportional to the position of the armature. In one embodiment a bi-directional device having two such closed flux carrying path simultaneously acts on a single armature. The equilibrium position of the armature is dependent on the relative flux flow through the two flux carrying paths. A further embodiment is disclosed in which an air gap opening is inclined to the direction of flux flow in the core of the flux path. The area of each pole surface defining the inclined air gap exceeds the cross-sectional area of the core.

Abstract: A polarized reversible direction solenoid having a rectangular sheet of flexible permanently magnetized material wrapped around the armature. This magnetized flexible sheet permits the construction of very small reversible solenoids at a reasonable cost.

Abstract: A solenoid in which the coil is positioned inside a housing of magnetic material. The housing has a tubular projection forming a recess in the inside of the end wall along the axis of the coil, one end of the plunger projecting beyond the coil into the recess when the plunger is in the energized position. The portion of the plunger that extends into the recess is tapered to obtain a constant force-displacement characteristic for the full travel of the plunger.

Abstract: A buzzer arm is attached to a synchronous motor to provide an audible alarm in response to energization of a winding of the motor and the relative position of the buzzer arm to a buzzer anvil extending from the motor.