Abstract: A reciprocatory fluid pump includes an armature assembly which is reciprocatably mounted to the housing by a pair of spaced leaf springs extending parallel to each other and fixed at their opposite ends to the armature assembly and housing, respectively, so as to define therewith a four-sided parallelogram in which the pair of leaf springs serve as two parallel sides, and the armature assembly and housing, respectively, serve as the other two parallel sides. The leaf springs are of flat rectangular configuration constraining the reciprocatory movement of the armature assembly to longitudinal displacement with a small transverse displacement. The housing includes a base, and the pair of leaf springs are secured at one of their ends to the base such as to reduce sounds and vibrations during the operation of the pump. Several embodiments are described in which the pumping member is a diaphragm, a pair of diaphragms, and a piston, respectively.

Abstract: A reciprocatory fluid pump includes an armature assembly which is reciprocatably mounted to the housing by a pair of spaced leaf springs extending parallel to each other and fixed at their opposite ends to the armature assembly and housing, respectively, so as to define therewith a four-sided parallelogram in which the pair of leaf springs serve as two parallel sides, and the armature assembly and housing, respectively, serve as the other two parallel sides. The leaf springs are of flat rectangular configuration constraining the reciprocatory movement of the armature assembly to longitudinal displacement with a small transverse displacement. The housing includes a base, and the pair of leaf springs are secured at one of their ends to the base such as to reduce sounds and vibrations during the operation of the pump. Several embodiments are described in which the pumping member is a diaphragm, a pair of diaphragms, and a piston, respectively.

Abstract: A fluid pump includes a piston disposed within a compartment and defining therewith a fluid-charging chamber on one side of the piston and a fluid-pumping chamber on the opposite side of the piston. The piston is formed with an opening therethrough establishing communication between the chambers. A one-way valve carried by the piston is effective to close the opening through the piston during the forward-pumping strokes and to open the opening during the return strokes. Further valve means are provided effective: to open the inlet with respect to the fluid-charging chamber during the forward-pumping strokes, to close the inlet with respect to the fluid-charging chamber during the return strokes, to open the outlet with respect to the fluid-pumping chamber during the forward-pumping strokes, and to close the outlet with respect to the fluid-pumping chamber during the return strokes.

Abstract: An electromagnetic device includes a core and a coil in the space between a central section and an outer section of the core and spaced inwardly of an open side of the core such that the coil is completely recessed within the core. An armature, facing and aligned with the recess in the core is being movable towards and away from the coil. A pair of springs on the opposite ends of the core, and coaxial with the longitudinal axis of the core, mount the armature for straight-line reciprocatory movements parallel to the longitudinal axis of the core such that during the movement of the armature: (a) a recess in the armature receives the central section of the core; (b) the outer surface of the armature defines a first working gap with the inner surface of the core outer section; (c) and the inner surface of the armature at the recess defines a second working gap with the outer surface of the core central section.

Abstract: An electromagnetic device includes a core and a coil in the space between a central section and an outer section of the core and spaced inwardly of an open side of the core such that the coil is completely recessed within the core. An armature, facing and aligned with the recess in the core is being movable towards and away from the coil. A pair of springs on the opposite ends of the core, and coaxial with the longitudinal axis of the core, mount the armature for straight-line reciprocatory movements parallel to the longitudinal axis of the core such that during the movement of the armature: (a) a recess in the armature receives the central section of the core; (b) the outer surface of the armature defines a first working gap with the inner surface of the core outer section; (c) and the inner surface of the armature at the recess defines a second working gap with the outer surface of the core central section.

Abstract: An electromagnetic device, comprising a first, ring-shaped wound unit consisting of at least first and a second sequentially wound portions of electrically insulated layers of concentrically wound windings, the first portion being made of high permeability material, the second portion being made of a relatively low resistance electrical current-carrying material, the first and second portions being electrically connected to each other and provided with terminal means for connection to a source of power, whereby in operation each of the units constitutes a current conducting as well as an electromagnetic field inducing body for the other of the interlinked units.

Abstract: The invention provides an electromagnetic actuatable device including at least one current carrying winding having electrical terminals for applying voltage thereacross and a ferrymagnetic member configured to provide a closed magnetic flux path for magnetic flux induced by the winding when voltage is applied thereto. The member is at least partly disposed within the winding and has means locatable at least in proximity to the winding for modifying magnetic field intensity therethrough. One of the windings or members is adapted to be immobilized with respect to the other so that upon the application of voltage to the winding the non-immobilized winding or member is movable with respect to the other as a result of the force developed by the induced flux.