Abstract: A mechanical heart for implantation into the human body is run at a higher frequency which is a harmonic multiple of a normal heart beat frequency, and the pump chamber volume is reduced, proportionately to the increased pumping frequency. The circuit for controlling the frequency includes a phase locked loop for implementing a predictive algorithm which adjusts the frequency dynamically based on heart muscle nerve ending signals to synchronize the circuit output to the biologically determined heart beat. The reduced displacement permits use of a smaller compliance chamber. A novel interconnection between the motor chambers of a plurality of such pumps eliminates the need for venting and compliance chambers in a totally implanted heart system.

Abstract: An electromagnetic reciprocating motor or pump for use for providing mechanical force for actuation of other fluids or components, and includes a cylinder provided with closures at each end, at least a pair of electromagnets operatively associated with the cylinder, and surrounding the same, a magnetically responsive piston provided within the cylinder and capable of longitudinal shifting reciprocally within the cylinder upon the sequential energization of the electromagnets, and either a mechanical actuator or electronic triggering components cooperating with electrical circuitry and connecting with the electromagnets which upon energization charging the electromagnets in timed sequence for inducing their reciprocal shifting of the piston within the cylinder means.

Abstract: A multistage resonant reciprocating compressor having opposed cylinders that are driven by a plunger unit. The plunger unit is suspended between a pair of spaced apart flexure springs and is electrically coupled to a linear motor mounted between the springs. The forces acting on the cylinder piston located on one side of the plunger unit are balanced against the piston forces acting on the other side of the unit and the stiffness of the flexure springs arranged so that the natural frequency of the plunger is at or near the exciting frequency of the motor.

Abstract: A pump has a housing that is divided into two chambers by an element that is driven in a push-pull manner so that the volumes of each of the two chambers are alternately enlarged and reduced. Both chambers are in the path of fluid through the pump.The chambers of a diaphragm pump in a preferred embodiment are defined by a piston with a hollow annular shape having a magnetic rod secured at its center. The piston travels along the axis of the rod to seat against the conforming surfaces of a hollow housing. The chambers are isolated by a flexible annular diaphragm secured to the piston and a center line of the housing. When adapted as an artificial heart, both chambers fill with blood, one being connected between veins and the lungs, the other being connected between the lungs and arteries.

Abstract: An ink liquid supply system for an ink jet system printer includes an ink liquid reservoir for containing ink liquid therein, and a compact size plunger pump for supplying the ink liquid to a nozzle. The compact size plunger pump integrally includes three pressure chambers defined by coaxially connected pistons. The pistons are driven to reciprocate by a plunger associated with an electro-magnetic solenoid. The first pressure chamber functions to introduce the ink liquid from the ink liquid reservoir and develop the ink liquid toward the nozzle. The third pressure chamber functions to introduce an ink liquid collected by a beam gutter of the ink jet system printer for returning the ink liquid to the ink liquid reservoir. The second pressure chamber functions as a damper for decelerating the shift movement of the pistons and plunger, thereby reducing the shock which will be created when the plunger is attracted by the electromagnetic solenoid.

Abstract: The pump has a chamber in which a piston reciprocates to pump a liquid. The piston is moved by having secured thereto the armature of at least one electromagnet (preferably two). The coil of the electromagnet is suitably external of the pump casing. A control circuit pulses the electromagnet at a predetermined rate to provide a predetermined periodic output.In a preferred form, the pump is mounted together with a liquid reservoir on a printed circuit board, and the unit is encapsulated for implantation in the human body to infuse a liquid medicine at a controlled rate into the bloodstream.

Abstract: A pump for driving a liquid, particularly liquid helium, has an electromatic drive contained in its entirety in the pump housing for generating an axially oriented force to reciprocate the pumping member. The electromagnetic drive has a stationary electromagnet supported in the pump housing and including an annular air gap and an energizing solenoid for generating a magnetic flux in the air gap. The electromagnetic drive further has a coil carrier attached to the pumping member to move therewith as a unit; the coil carrier has a travelling path passing through the air gap and being parallel to the pump axis. Further, a moving coil is mounted on the coil carrier for traversing the magnetic flux in the air gap, whereby an electromagnetic force parallel to the pump axis is exerted on the moving coil for displacing the moving coil, the coil carrier and the pumping member as a unit.

Abstract: Disclosed herein is a marine propulsion device comprising a lower unit including a lower end, and a propeller rotatably mounted in the lower end, a power head comprising an engine including a carburetor, and an output shaft drivingly connected to the propeller, a bracket assembly adapted for mounting the lower unit to the transom of a boat and for vertical tilting movement and horizontal steering movement relative to the boat, a source of oil, a source of fuel, and a device including an outlet connected to the carburetor, a first inlet connected to the oil source, and a second inlet connected to the fuel source, for pumping oil and supplying fuel or a fuel/oil mixture to the carburetor, which supplying device is operable, in response to consumption of fuel or fuel/oil mixture by the carburetor and in response to the presence of a pressure differential between the outlet and the second inlet.

Abstract: Disclosed herein is a combined oil pumping and fuel supplying device comprising a housing including a variable volume discharge chamber which is adapted for fluid communication with a point of use and which varies in volume between a greater volume and a lesser volume, an inlet chamber which is adapted to communicate with a source of fuel under pressure and which varies in volume between a larger volume and a smaller volume, a valve communicating between the discharge chamber and the inlet chamber and operable between open and closed positions, structure for displacing the valve to the open position in response to contraction of the discharge chamber to the lesser volume, structure for displacing the valve to the closed position in response to contraction of the inlet chamber to the smaller volume, and a plunger responsive to variation in volume of one of the chambers toward one of the greater and lesser volumes for pumping oil for supply to a point of use.

Abstract: A pump and method for moving a fluid, as blood, having a body and end members forming a cylindrical chamber. A free floating piston located in the chamber is moved along the length of the chamber with a solenoid to pump blood into and out of opposite ends of the chamber. The end members containing inlet and outlet valves and sleeves are adapted to attach to veins or tubes to carry the blood to and from the pump. When electrical power is applied to the solenoid, a magnetic force operates to move the piston in the chamber, thereby pumping blood into and out of the chamber through the valves in the opposite end members.

Abstract: A method and apparatus for controlling a resonant piston compressor of the type comprising an electrodynamic linear reciprocating motor adapted to be driven cyclically by an alternating current power source and having at least one piston coupled to and adapted to be driven within a selectively valved working cylinder by the linear reciprocating motor in synchronism with the frequency of the alternating current power source. Enclosed volumes of gas act as resilient gas springs coacting with the piston and with the linear reciprocating motor to form a mechanical resonant system having a resonant frequency substantially centered on the frequency of the alternating current power source. A midstroke porting arrangement is responsive to the position of the resonant piston for selectively communicating a gas spring control valve with said gas springs.

Abstract: A control system for controlling the operation of a reciprocating resonant free-piston variable stroke compressor of the type driven by electrodynamic linear motors wherein the spring-mass system of the compressor which is forced into vibration by the linear motor, is arranged to have a selectively variable mechanical resonant frequency generally centered on the power line frequency of the alternating current power source used to drive the linear motor. The control system provided by this invention variably controls the opening and closing of a gas spring control valve that in turn regulates the pressure of gas filled volumes selectively connected to a manifold vented by the valve. The volumes comprise the resilient gas springs for the resonant piston compressor.

Abstract: A device for distributing fuel to a combustion engine provided with two or more fuel pumps which are electromagnetically driven, the stroke of said fuel pumps being bounded by an adjustable stop bearing on a fixed stop support.In order to avoid variation of the adjusted pump displacements due to the frequent, heavy impacts which are exerted by the armature of electro-magnets through the stop member on the stop support, the stop support forms part of a firm monolith, while also other pump parts form part of said firm monolith.

Abstract: A metering fluid pump including a cylinder and a pumping piston movable therein, the cylinder being configured to define a liquid inlet chamber on one side of the piston and a liquid outlet chamber on the opposite side of the piston. A suction valve for the inlet chamber and a pressure valve for the outlet chamber open simultaneously when the piston is moving in a first direction to simultaneously pump liquid out of the outlet chamber and draw liquid into the inlet chamber. Both valves close when the piston is moved in a second reversed direction to transfer the liquid through a constricted conduit from the inlet chamber into the outlet chamber. In a second aspect of the invention an accumulator may be provided which receives liquid under pressure from the inlet chamber and which transfers the liquid into the outlet chamber when the piston is moved in the second direction and is at the end of its transfer stroke.

Abstract: An electromagnetic fuel delivery pump is formed by a combination of a diaphragm pump and a metering pump. Each of the pumps have working chambers and flow control valves are arranged to enable interconnection of the working chambers when the diaphragm pump executes a delivery stroke and the metering piston pump executes a suction stroke. In a preferred embodiment, a diaphragm of the diaphragm pump is disposed directly on an extension of a piston of the metering piston pump, which piston is connected with an armature of an electromagnet that produces the delivery stroke of the piston metering pump and the suction stroke of the diaphragm pump. The delivery stroke of the diaphragm pump and the suction stroke of the piston metering pump are executed under the influence of a common return spring.

Abstract: The fluid pump comprises at least one pumping cylinder having a pumping piston mounted therein for reciprocating movement and including an inlet valve and an outlet valve for permitting the entry and exit, respectively, of fluid into the cylinder in response to reciprocating movement of the piston. A piston rod is connected to the pumping piston and extends outwardly from the cylinder where it is connected to a piston made of magnetic material. The magnetic piston is surrounded by a plurality of coils which are controlled for causing sequential actuation of the coils to move the magnetic piston back and forth in an axial direction, thereby causing reciprocating movement of the pumping cylinder. The method for pumping fluid with the pump comprises sequentially actuating different portions of the coils in such a manner that during movement of the piston between its extreme positions only those coils located most closely to the piston will be actuated at any given time.

Abstract: A magnetic reciprocating pump for pumping fluids, i.e. gases or liquids, with high pressures and at high temperatures is provided. The pump has a piston freely movable in a tube of non-magnetic material and provided with recesses for the fluid to be pumped. A ball valve is provided in the piston and in one end of the non-magnetic tube. The drive force on the piston is transmitted by permanent ring magnets arranged outside of the non-magnetic tube, said ring magnets being reciprocated by a thrust rod driven by an electric motor. The balls of the valves are of steel and for sealing the high pressure system metal rings are provided. Connecting rods connect the peripheral body of the pump containing the magnets to the peripheral body of a magnetic coupling the core piece of which is arranged freely movable in a sealingly closed guide tube and is made up of axially magnetized permanent ring magnets. The magnets are secured to an arbor connected to the thrust rod.

Abstract: Device for supplying fuel to the atomizer of a combustion engine comprises at least a pump to be connected with the atomizer having a piston-bounded pump chamber and an electromagnet for reciprocating said piston.Said device is improved, particularly with regard to the seal of the pump piston, the control and the adjustment of the pumped quantity of fuel, the life-time and the cooling of the device, the compactness and simplicity of construction and/or simplification of maintenance.

Abstract: A pump for moving a fluid, as blood, having a body and end members forming a cylindrical chamber. A free floating piston located in the chamber is moved along the length of the chamber with a solenoid to pump blood into and out of opposite ends of the chamber. The end members containing inlet and outlet valves and sleeves are adapted to attach to veins or tubes to carry the blood to and from the pump. When electrical power is applied to the solenoid, a magnetic force operates to move the piston in the chamber, thereby pumping blood into and out of the chamber through the valves in the opposite end members.

Abstract: A construction having utility as a replacement for one or both chambers of a human heart, constituting a pump which operates in accordance with solenoid principles. A hollow and firm cylindrical member of non-magnetic material has an inlet port and an outlet port at each end. A check valve is associated with each of the ports, so that blood may be both admitted and expelled from each end of the cylinder. A ball which is responsive to a magnetic field rolls or floats within the cylinder. A magnetic field, typically obtained from passing current through an electrical coil, is alternately established at one end of the cylinder and then the other end, whereby the ball will oscillate to and fro--pushing blood ahead of it. Clearance between the ball and the inside wall of the cylinder insures at least some reverse flow of blood, cleaning the ball with each stroke. Electrical circuitry is provided to adjust at least one of the electrical pulse parameters, including frequency, amplitude and duty cycle.

Abstract: A pump and pump system employs electromagnetic actuation during discrete, periodic time periods, imparting rapid strokes covering small distances. Each stroke is delineated by stop members at least one of which is of wedge-like form and is controllably shifted to vary the stroke.

Abstract: Device for supplying fuel to the atomizer of a combustion engine comprises at least a pump to be connected with the atomizer having a piston-bounded pump chamber and an electromagnet for reciprocating said piston.Said device is improved, particularly with regard to the seal of the pump piston, the control and the adjustment of the pumped quantity of fuel, the life-time and the cooling of the device, the compactness and simplicity of construction and/or simplification of maintenance.

Abstract: A multi-stage pumping assembly comprising a plurality of pumping units arranged end to end in an elongate cylindrical housing. Each pumping unit comprises a solenoid which when energized causes a pumping piston to retract downwardly on its intake stroke, and when de-energized permits a tension loaded rubber sleeve element to pull the piston upwardly on its discharge stroke. Each of the solenoids is energized in sequence so that the pumping pistons move through their pumping cycles in a sequential pattern. In pumping against lower pressures, each piston is able to move through a longer path of travel on its discharge stroke to effect a higher volumetric flow of liquid. When working against higher head pressures, the pressure exerted by the several pumping pistons, working cumulatively effects a lower volumetric flow of fluid at a higher pressure.

Abstract: A check valve which closes more rapidly to prevent wearing of the valve seat and of the valve member that seals thereagainst, including a solenoid or other actuator that aids the normal spring to quickly close the valve at approximately the time when downpath fluid flow would stop, the actuator then being deenergized. The control circuit that operates the actuator can include a pair of pressure sensors sensing pressure both upstream and downstream from the valve seat. Where the valve is utilized to control flow to or from a piston pump, energization of the actuator can be controlled by sensing when the pump piston reaches its extreme of travel.

Abstract: A very high pressure pump apparatus which minimizes wear on the seals thereof and on valves connected thereto, by utilizing a very long stroke piston rod whose opposite ends are received in long cylinders. An electric motor which drives the rod, includes a rotor with a threaded aperture that receives a long threaded middle portion of the rod, so that as the rotor turns it advances the rod.

Abstract: A mixing apparatus for fuel and oil to be supplied on demand to an internal-combustion engine. An oil reservoir separate from a fuel tank is provided with an expandable chamber assembly and a positive displacement pump which are jointly operated in an opposed tandem relationship. The chamber assembly is used to supply mixed fuel and oil on demand to the engine fuel intake. The positive displacement pump draws measured amounts of oil from the reservoir during each stroke cycle and injects this measured amount into the incoming fuel in the chamber assembly. As one moves through its suction stroke, the other moves through its delivery stroke. The ratio between the volume displacement of the pump relative to the volume displacement of the expandable chamber assembly is equal to the desired volume ratio of oil to fuel at the engine fuel intake. The oil and fuel are thoroughly mixed as they are delivered from the apparatus.

Abstract: A glass washing electromagnetic pump comprising a cylinder in communication at both ends with two ducts, said ducts being a suction duct and a delivery duct, said cylinder containing a piston which is alternately moved toward the one or the other side of the cylinder by means of the alternate energization of two electromagnets enclosing said cylinder, so that at each movement or stroke of the piston there is at the same time a delivery action from one chamber defined by said piston inside said cylinder and a suction action in the other chamber.

Abstract: A compressor of the free-piston resonant type driven by an electrodynamic oscillating motor incorporates means to control the stroke to allow for stable operation over a wide range of operating conditions. The spring-mass system of the compressor which is forced into vibration by the electrodynamic oscillating motor is arranged to have a selectively variable natural resonant frequency generally centered on the power line frequency. Variable area port means responsive to any overstroking are operative to vary the natural frequency of the spring-mass system by varying the stiffness of a gas spring means thereof so as to oppose overstroking and also provide for a maximum stroke limit.

Abstract: A linear motor is operatively connected to operate a pair of axially aligned compressors. A pair of axially spaced and oppositely wound coils are mounted to a cylindrically shaped coil form movably connected to drive the aligned compressors with the coils serially connected to a single phase A.C. power source. A pair of spaced annular magnets provide a pair of annular poles of opposite polarity spaced immediately adjacent to the pair of coils while an outer annular flux conducting member connects the outer radial portions of the annular magnets. One embodiment spaces the pair of compressors at opposite axial extremities of the linear motor construction while a second embodiment centers the compressors within the movable coil form.

Abstract: A compressor of the resonant type driven by an electrodynamic linear motor incorporates means to control the stroke and to improve the power factor. The spring-mass system of the compressor which is forced into vibration by the motor is arranged to have a selectively variable resonant frequency generally centered on the power line frequency. Means responsive to any overstroking are operative to vary the natural frequency of the spring-mass system, for example by varying the stiffness of the spring means, so as to oppose further overstroking and maintain a high power factor.

Abstract: A reciprocating motor compressor assembly includes a pair of opposed pistons or diaphragms actuated by a reciprocating armature. The armature is fabricated from laminations of ferromagnetic material and includes a pair of electrically conductive induction rings disposed about the ends of the laminations in coaxial relationship with a longitudinal axis of the armature. A two coil stator is disposed in coaxial relationship with the armature and the coils are alternately energized by a multivibrator or a pair of oppositely poled half wave rectifiers connected to a source of alternating current voltage. In order to increase the duty cycle of the energizing current, each stator coil is provided with two coaxially wound parallel connected windings and a phase shifting capacitor connected in series with one of the windings.