Abstract: A resonant reciprocating compressor wherein a reciprocating assembly comprising the movable armature of an electric reciprocating motor and a piston means coupled to the armature is driven cyclically when the electric motor is energized from an alternating current source to compress a working fluid, and including means operatively associated with the reciprocating assembly for producing a stabilizing force gradient in a direction to maintain or restore the reciprocating assembly to a centered operating position.

Abstract: A high pressure fluid pump having a telescoping cylinder assembly disposed in a cylindrical sleeve. The telescoping cylinder assembly has a stationary member rigidly attached to the cylindrical sleeve and a telescoping member biased towards an outlet port. The telescoping member is reciprocated relative to the stationary member by the displacement of an armature in response to the intermittent energizing of a solenoid coil. An inlet valve connected to the telescoping member and an outlet valve connected to the stationary member provide a unidirectional fluid flow through the telescoping cylinder assembly with the reciprocation of the telescoping member. The outlet valve has a flat valve member which is biased against a valve seat provided at the end of the stationary member adjacent to the outlet port. The flat valve member is preferably made from a resilient elastomer which increases the efficiency of the pump and eliminates forward and back syphoning.

Abstract: A positive shut-off electromagnetic fluid pump of the type having a piston electromagnetically reciprocated in a cylindrical guide by a solenoid coil and a pair of valves for providing a unidirectional fluid flow from an inlet port to an outlet port in response to the reciprocation of the piston. An elastomer bumper attached to the piston occludes the outlet port when the piston is biased to its extreme position adjacent to the outlet port when the solenoid coil is de-energized.

Abstract: A linear air compressor having a linear electrodynamic motor which is air cooled and has an increased stroke and accordingly increased output. The working piston is provided with and stroke parting on a push-pull spring provides for centering of the plunger of the motor.

Abstract: Electromagnetic reciprocating pump including a plurality of pumps combined in such a manner that the mode of connection between the suction inlet and the discharge outlet in each of the pumps is allowed to be changed and, as the result, the amount of suction or discharge or the degree of vacuum or compression is allowed to be selected at a multiplicity of stages without any loss of the energy of the alternating current power. The plurality of pumps are disposed in such a manner that the axes of their respective pistons intersect one another at one point and the pumps themselves are rotationally symmetrical with respect to the point mentioned above.

Abstract: A system and apparatus for controlling the operation of a vibrating compressor using a predetermined frequency corresponding to the load thereof, comprising a first sensor for detecting a temperature of pressure corresponding to the saturated vapor pressure of a refrigerant sucked by a vibrating compressor, a second sensor for detecting a temperature or pressure corresponding to the saturated vapor pressure of the refrigerant compressed and discharged by the compressor, and a control section for generating a drive power of a predetermined frequency based on the temperatures and pressures detected by the first and second sensors, and characterized in that the compressor is driven by a drive power generated by the control section.

Abstract: A liquid-propellant delivery system using low-pressure propellant storage tanks instead of heavier high-pressure tanks. Liquid propellant material is pumped from the low-pressure tanks by a solenoid-actuated high-pressure pump, and delivered to the rocket engine through a pressure-actuated injector valve.

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: Apparatus and method for operating a downhole sucker rod pump in which a downhole linear motor is controlled by a surface digital computer. The motor includes a number of coil sections circumfusing and spaced along the length of a non-magnetic tube, and an armature positioned coaxially inside the tube. The armature section includes a central mandrel of a non-magnetic material and a number of laminated armature sections circumfusing and spaced along the length of the mandrel. The tube is sized substantially the same as the production tubing, and the armature is not physically connected to the tube, such that the armature and the attached pump can be removed without removing the tubing. The coils are energized by electric power supplied by three electric conductors running from the surface.

Abstract: A pump wherein an armature (64) is reciprocated between an electromagnetic core (54) and a housing (48). A diaphragm (68) is responsive to movement of the armature (64) and cooperates with a body (10) to form a pumping chamber (80). Expansion of the pumping chamber (80) by spring (66) draws fluid through a valve (20) at a slow rate. Contraction of the pumping chamber (80) by electromagnetic attraction of armature (64) to core (54) expels fluid through valve (42).

Abstract: An electromagnetic pump includes a coil bobbin with an excitation coil, a pair of magnetic cylinders, a printed circuit board with a transistor, and a pump housing. The coil bobbin is disposed around a sleeve member having a plunger therein. The pair of magnetic cylinders are axially inserted from two ends of the bobbin between the inner surface of the coil bobbin and the outer surface of the sleeve member. The pump housing consists of a cup-like housing body and a lid. The plunger, the magnetic cylinders and the pump housing are made of a magnetic material to form a magnetic flux path from the excitation coil.

Abstract: An electromagnetic pump has a pump housing. The pump housing consists of a cup-like housing body with an outlet cylindrical portion at the center thereof and a lid member having an inlet cylindrical portion at the center thereof. The lid member is fixed to the cup-like housing body. The pump also includes a nonmagnetic sleeve member, a magnetic plunger slidably fitted in the nonmagnetic sleeve member, a return spring for biasing the plunger to a delivery side, inlet and outlet pipes, a coil bobbin arranged around the sleeve member, a transistor assembly consisting of a transistor and a heat sink, a printed circuit board, a holder mounted above the printed circuit board, a leaf spring arranged between the housing body and the holder. A plurality of studs extend on the outer side surface of the flange of the coil bobbin on which the transistor assembly is mounted and on an inner side surface of the holder.

Abstract: An electromagnetic pump comprising a housing having a fluid receiving chamber in communication with an inlet, a pair of fluid chambers connected by a fluid bypass passage to accommodate bubbles, one in communication with the fluid receiving chamber and the other in communication with an outlet, an electromagnet carried by the housing located external to the fluid chambers thereof, and a barrier in the form of a thin diaphragm of fluid impermeable material which hermetically isolates the electromagnet from the fluid chambers. An armature in the housing is movable within a body of magnetically permeable material which contains the bypass, has a pole portion located for magnetic attraction by the electromagnet, and has a piston portion, preferably of smaller cross-section than the pole portion, for forcing fluid from the fluid chambers and through the outlet.

Abstract: A vibrating compressor comprising an external iron core, a permanent magnet, an internal iron core, and an electrocmagnetic coil vibratably supported by a mechanical vibrating system in a magnetic gap between the two iron cores to drive a piston connected thereto; the permanent magnet being composed of a high residual (remanence) magnetic flux density magnet, as represented by an alnico magnet, and a high coercive force magnet, as represented by ferrite magnet, and disposed separately.

Abstract: An implantable, anti-reflux, fluid displacement peritoneovenous shunt system. The system includes a double chambered multi-micro-orifice ascites collection device, a magnetically driven pump, and an anti-reflux, anti-backdiffusion, non-thrombogenic catheter tip, all connected by flexible tubing. The shunt is used to transfer fluid from the peritoneum to the cardiovascular system to prevent accumulation of fluid within the peritoneal cavity. The magnetically operated pump may be of either the reciprocating diaphragm or piston type or it may be a rotary driven bellows displacement pump.

Abstract: An electromagnetically operated fuel feed pump has an electronic control which comprises a phototransistor circuit with a delay element and a threshold switch. With this control a wear-free operation of the control is possible in a space-saving arrangement.

Abstract: A single valve diaphragm pump is disclosed which generally includes: a pump housing, a flexible diaphragm reciprocally movable in the pump housing; an inlet filter means; and, an outlet valve. The flexible diaphragm conforms in shape to a portion of the pump housing when the diaphragm is in its actuation or rest position. The pump eliminates an inlet check valve and replaces it with an inlet filter means. The invented pump has a stroke volume which is extremely constant even though ambient pressure and reservoir pressure may vary over a considerable range. Furthermore, the invented pump provides a practical means for preventing gas bubbles from entering into the pump chamber. The invented pump can have application as a medication pump for use external to or implanted within a living body.

Abstract: In a cryogenic split Stirling refrigerator, the compressor and displacer are driven by linear drive motors. Each compressor linear drive motor has a plurality of radial permanent magnets 44, 46 mounted to each compressor piston 22, 24. A tapered collet 56 expands an expanding sleeve 42 against the magnets and compresses a sleeve 38 against the piston. A housing 34 hermetically seals the gas about the armature and supports the coil assembly 76, 78. The displacer drive motor includes an axial permanent magnet 202 mounted to the displacer drive piston 192. It is surrounded by a housing 210 which hermetically seals the spring volume surrounding the magnet. The drive coils 216, 218 are supported on that housing. The coils are surrounded by flux returns 222, 224 which can be adjusted to minimize radial forces on the drive piston.

Abstract: An electromagnetic pump comprising a housing having fluid receiving and pumping chambers in communication with an inlet and an outlet, respectively, an electromagnet carried by the housing external to the fluid chambers, and a barrier in the form of a thin diaphragm of fluid impermeable material which hermetically isolates the electromagnet from the fluid chamber. An armature in the housing is movable within a body of magnetically permeable material and has a pole portion located for magnetic attraction by the electromagnet and has a plunger portion in the pumping chamber for forcing fluid out of the chamber through the outlet. The armature is moved from a rest position through a forward pumping stroke when attracted by the electromagnet to force fluid out of the pumping chamber through the outlet, and the armature is moved by biasing spring in an opposite direction through a return stroke back to the rest position.

Abstract: An electromagnetic pump comprising a housing having a fluid receiving chamber in communication with an inlet, a pair of serially-connected fluid pumping chambers, one in communication with the fluid receiving chamber and the other in communication with an outlet, an electromagnet carried by the housing located external to the fluid chambers thereof, and a barrier in the form of a thin diaphragm of fluid impermeable material which heremetically isolates the electromagnet from the fluid chambers. An armature in the housing is movable within a body of magnetically permeable material, has a pole portion located for magnetic attraction by the electromagnet, and has first and second plunger portions in respective ones of the pumping chambers for forcing fluid out of the chambers and through the outlet.

Abstract: A compact portable, easily operated, paint applying apparatus has a frame adapted to rest on the ground, a lifting handle on the frame for ease in carrying to use locations, a paint reservoir removably supported in upright position on the frame, an electric motor driven paint pump mounted on the frame above the reservoir, an intake tube depending from said pump into the reservoir, a discharge tube extending from the pump, and a paint applicator supplied by the discharge tube. The frame is preferably L-shaped with a bottom horizontal leg provided a sturdy base and an upright vertical leg. The horizontal leg has a well receiving the paint reservoir, the vertical leg has a recess receiving the rear end of a housing in which a reciprocal electric motor is mounted. The front end of the motor housing mounts a pump housing with a depending intake coupling directly over the paint reservoir on the horizontal base and an outlet coupling on the front end thereof.

Abstract: A reciprocating electric motor-pump assembly for lifting well fluid on downstroke of the motor pump assembly, the pump including a barrel below the motor having dual combined inlet and outlet valve means at the lower end thereof, the pump piston moving in the barrel having annular grooves therearound to prevent differential pressure sticking, the electric cable supplying the electric motor being tubular to vent the pump and prevent vacuum or gas lock, there being a packer about the valve barrel separating the outlet valve means thereabove from the inlet valve means therebelow and a packer above the motor about a production tubing including an upper standing valve.

Abstract: In a cryogenic split Stirling refrigerator, the compressor and displacer are driven by linear drive motors. Each compressor linear drive motor has a plurality of radial permanent magnets 44, 46 mounted to each compressor piston 22, 24. A tapered collet 56 expands an expanding sleeve 42 against the magnets and compresses a sleeve 38 against the piston. A housing 34 hermetically seals the gas about the armature and supports the coil assembly 76, 78. The displacer drive motor includes an axial permanent magnet 202 mounted to the displacer drive piston 192. It is surrounded by a housing 210 which hermetically seals the spring volume surrounding the magnet. The drive coils 216, 218 are supported on that housing. The coils are surrounded by flux returns 222, 224 which can be adjusted to minimize radial forces on the drive piston.

Abstract: A pump system is disclosed for delivering hydraulic fluid to a load device, such as a hydraulic brake system. The system automatically switches from larger displacement to smaller displacement as pressure at the outlet increases. The pump system comprises one or more lower pressure pumps and a high pressure pump with an actuator driving all pumps simultaneously. An unloading valve is coupled with each lower pressure pump for dumping the output thereof in response to pressure of the fluid delivered to the load device. The actuator comprises an electromagnetic linear motor which imparts an intake stroke to the pumps and stresses a spring which releases stored energy for imparting the pressure stroke to the pumps.

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 reciprocating electric motor-pump assembly for wells lifts well fluid on downstroke of the motor-pump assembly, and with the motor above the pump the well fluid is conducted from below the motor to above the motor via a flow passage through the motor armature, which is tubular.

Abstract: The membrane of a diaphragm pump is deformable by the reciprocable armature of a cylindrical electromagnet which is installed in the interior of a plastic housing adjacent to a partition which separates the winding or windings of the electromagnet from the casing of the pump and which carries the casing as well as the electromagnet. That section of the housing which surrounds the electromagnet is a relatively thin cylinder having circumferentially extending heat-dissipating ribs and a cylindrical internal surface which defines with the cylindrical external surface of the electromagnet a gap of constant width. The area around the cylindrical section of the housing is unobstructed, and the housing further includes a larger section which is integral with the cylindrical section, which is rigid with a foot extending well below the electromagnet to enhance the stability of the machine, and which confines a control circuit for the electromagnet.

Abstract: A fluid operating device including a cylinder assembly with a cylinder bore and a pair of pistons slidably disposed therein. A plurality of electromagnets are mounted on each piston in opposed relation and extend the pistons by magnetic repulsion when energized. Inlet and outlet valves are provided in the cylinder and include permanent magnet valve members which open and close the valves upon energization and de-energization of the electromagnets.

Abstract: A fluid flow machine has a diaphragm pump which is driven by an electromagnet and is confined in a pressure-resistant capsule together with the electromagnet as well as with the electronic control unit for the electromagnet. The constituents of the capsule are connected to each other so that they form one or more gaps each having a configuration and dimensions such as to prevent the propagation of flames and/or sparks from the interior of the capsule to the surrounding area. This renders it possible to use the machine in an explosive atmosphere, even if the pump is designed to deliver metered quantities of flammable fluids. A gap of the above outlined character is provided between two portions of the capsule where a reciprocable plunger extends toward the diaphragm.

Abstract: A fluid pumping system including a variable-volume, fluid-reception chamber having an inlet conduit leading from a fluid supply site and an outlet conduit leading to a fluid delivery site. An elongated plunger body is drivingly coupled with the chamber and linearly reciprocable along its longitudinal axis so as to alternately expand and contract the volume of the chamber, thereby alternately drawing a fluid into the chamber through the inlet conduit from the fluid supply site and pumping the fluid through the outlet conduit towards the delivery site. The linear reciprocation of the plunger body is effected by an electromagnetically operated drive, preferably a linear motor drive, at a rate of reciprocation in the range of 0.01 to 10 Hz.

Abstract: An oil lubrication system, especially for knitting machines includes a plurality of electromagnetically driven piston pumps, one of which is assigned to each individual lubrication site operated by and exciting current pulses of adjustable pulse-recurrence frequency. Each piston pump has a scanning device which produces a receipt pulse during the working stroke when the pump piston reaches its end position. The current pulse and receipt pulse are applied to a monitoring device which provides an output signal if the receipt pulse is not applied within a certain time after the current pulse. An indicator light flashes at each current pulse and switches to a permanent signal when an output signal is produced. An oil storage vessel feeding the pumps can be provided with a filling state monitor when produces an electrical oil deficiency signal when the oil level falls below a predetermined minimum. Both the oil deficiency signal and the output signal are applied to a disconnecting unit which stops the machine.

Abstract: An electromagnetic pump of the built-in electromagnetic valve type including an electromagnetic plunger actuating electromagnetic coil and an electromagnetic valve operating electromagnetic coil disposed co-axially in adjacent relationship and having magnetic paths of their own separated from each other by a non-magnetic portion, to obtain a desired magnetic flux distribution. The two electromagnetic coils have the same direction of windings to obtain an improved magnetic flux distribution, thereby providing improved pump operation. By passing a half-wave rectified current or a pulse current of a predetermined cycle to the two electromagnetic coils connected in series with each other, a magnetic flux can be produced in each electromagnetic coil and made to flow in the magnetic path exclusive to each electromagnetic coil, so that mutual interference of the magnetic fluxes produced by the two electromagnetic coils can be avoided.

Abstract: A vibration free fluid compressor particularly adapted for Stirling cycle cryogenic refrigeration apparatus comprising a pair of identical opposing ferromagnetic pistons (10, 12) located in a housing (22) and between a gas spring including a sealed volume (52, 54, 60) of a working fluid such as gas under pressure. The gas compresses and expands in accordance with movement of the pistons (10, 12) to generate a compression wave which can be vented out to other apparatus, for example, a displacer unit in a Stirling cycle engine. The pistons (10, 12) are urged outwardly due to the pressure of the gas; however, a fixed electromagnetic coil assembly (56), located in the housing adjacent the pistons, is periodically energized to produce a magnetic field which interlinks the pistons (10, 12) in such a fashion that the pistons are mutually attracted to one another.

Abstract: A sensor utilizes the opposition of a fluid to physical displacement to provide information about the fluid itself, such as its quality as measured by its density or viscosity, or about the state of a fluid system which contains it, such as the fluid pressure existing at some point in the system. The sensor includes a fluid displacement device or element physically adapted to displace the fluid and repetitively urged into displacement by the application of a known impetus or urging force. The resulting motion of the element is then analyzed to obtain the information desired. The fluid displacement element may additionally perform a pumping function, or it may operate in a fluid stream externally powered. When employed as a pump, the sensor may provide information on the fluid pumped or on the state of the fluid system.

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: An implantable microinfusion pump system for dispensing medication at a prescribed infusion rate within the human body includes a hermetically sealed housing in which a power source and circuitry for actuating the pump are contained. A permanently magnetized piston is mounted for reciprocative fill and pump strokes within a pump chamber defined by a pump body member which extends between parallel-spaced walls of the housing. The body member communicates at one end with an expandable medicament reservoir adjacent one wall of the housing, and at the other end with a catheter for conveying medicament to the body. A two stage valve arrangement causes medicament to enter the pump chamber during fill strokes of short duration and to be dispensed from the pump chamber at the prescribed infusion rate during longer duration pump strokes.

Abstract: A reciprocating pump for delivering cutting fluid to the machining situs between a tool and a workpiece includes a collapsible piston which forms a substantial seal in the pump during the power stroke and then collapses during the relaxation stroke to allow the piston to reassume its initial position in preparation for the next power stroke. The pump includes an indexer and switch which maintain the pump in an operative condition, thereby delivering cutting fluid to the machining situs for a predetermined amount of displacement between the tool and workpiece prior to engagement and subsequent thereto. The indexer and switch exploit a predetermined amount of play in the switch to maintain the pump in an operative condition for the desired time.

Abstract: A low cost electromagnetic fluid pump having molded structural plastic housing components, a biased reciprocating hollow piston, and a pair of plastic flapper valves providing for a unidirectional fluid flow is disclosed. An integrated circuit timer periodically energizes a solenoid coil producing an oscillating magnetic field reciprocating the piston.

Abstract: An integral valve and pumping unit is provided for infusing medication into the body which employs only one moving part. This pumping unit is connected to the medication supply reservoir through a first flow restriction device which has no moving parts but has directional flow characteristics so that liquid medication can flow readily from the reservoir to the pumping unit but flow from the pumping unit to the reservoir encounters a relatively high resistance. A second flow restriction device is connected between the pumping unit and the outlet catheter which is employed to infuse medication into the body, this second flow restriction device likewise having no moving parts and offering relatively little resistance to liquid flow from the pumping unit to the catheter while having relatively high resistance to flow in the opposite direction.

Abstract: The invention relates to an electrically driven oscillating compressor, in particular for use as refrigerating machine, comprising a piston compressor, an electric oscillating drive for directly driving the piston compressor and a pulse shaper for supplying energy to the electric oscillating drive, wherein the group consisting of the compressor piston which is resiliently held in a central initial position, the other oscillating masses, the gas spring rate and the electric components of the oscillating drive form an electro-mechanical oscillating system whose natural frequency is at least approximately equal to the frequency of the current energizing the oscillating drive.

Abstract: A pump utilizing a permanent magnet used for pumping fuel or lubricating oil without an electric power supply for an internal combustion engine or liquid fuel combustion equipment. This pump does not employ the conventional flexible membrane or diaphragm to pump fluid or liquid required to provide an exactly airtight construction, but utilizes a permanent magnet with high durability and inexpensive manufacturing cost for pumping liquid steadily.

Abstract: Apparatus for producing linear motion comprising a coil defining an electromagnetic field across a gap; and a permanent magnet disposed within the magnetic field in the gap and arranged to be driven in motion by the magnetic field, the permanent magnet being configured such that its axis of magnetization lies along its smallest dimension.

Abstract: The invention deals with a method and a circuit for operating a spray gun having a vibrating armature drive which is energized with an electrical a.c. signal. To reduce the liquid which is sprayed per unit of time by the spray gun, a pulse width modulated energizing signal with abruptly rising leading edges is fed to the vibrating armature drive. The circuit includes a control circuit which produces a control signal with abruptly rising leading edges and a controllable switch which electrically couples a supply voltage source and the vibrating armature drive, the control terminal of the switch being connected to the output of the control circuit. The circuit may alternatively have a signal generator which produces a control signal with abruptly rising leading edges and a power amplifier connected to the output of the signal generator, the output of the power amplifier being connected to the vibrating armature drive.

Abstract: An extracorporeal medication infusion device provides a precise infusion rate of a liquid medication into a human or animal body. The infusion device includes a permanent portion which has a case, a battery, a programmable electronic controller, and an electromagnetic solenoid core and solenoid coil for providing an actuation force. The infusion device also includes a disposable portion which includes a reservoir filled with a liquid medication that is to be dispensed and a pump for pumping the medication from the reservoir into the user's body. The pump includes a pump chamber and a piston connected to an electromagnetic armature for altering the volume of the pump chamber in response to the actuation force.

Abstract: An extracorporeal medication infusion device provides a precise infusion rate of a liquid medication into a human or animal body. The infusion device includes a permanent portion which has a case, a battery, a programmable electronic controller, and an electromagnetic solenoid core and solenoid coil for providing an actuation force. The infusion device also includes a disposable portion which includes a reservoir filled with a liquid medication that is to be dispensed and a pump for pumping the medication from the reservoir into the user's body. The pump includes a pump chamber and a piston connected to an electromagnetic armature for altering the volume of the pump chamber in response to the actuation force.

Abstract: An apparatus for portional ejection of lubricant for lubrication of railway rails, comprising a tank for lubricant, a dosage pump connected to the tank and driven by an operating unit, a nozzle, and a timer for controlling the operating unit. The operating unit is an electromagnet including a movable armature the movement of which acts upon an ejector piston in the dosage pump. A connecting device is provided between the movable armature of the electromagnet and said ejector piston which establishes a power-transmitting connection only after a predetermined distance of displacement of the armature.

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: A horizontal type vibrating compressor having a cylindrical container for accommodating a compressor proper which is disposed horizontally, and closure members for closing both open ends of the cylindrical container; and having such a construction that a piston fixed to a driving coil is caused to vibrate in substantially horizontal direction in a cylinder, wherein coil springs are respectively interposed in the compressed state between each closure member and the compressor proper; cushioning members are fixed via cup-shaped holders to any one side of the compressor proper or the closure members; pin-shaped supporting members, which are adapted to be axially slidable by engaging with the cylindrical portion of the cushioning members are fixed to the other side of the compressor proper or the closure members; and an air/oil intake tube connecting the outside and inside of the compressor proper is provided, the outer end thereof being connected to a fiber braided tube disposed on the lower inside part of the c

Abstract: In a submersible pump of the type comprising a liquid inlet, a liquid outlet and an interconnecting valve chamber in which a valve member reciprocates to force liquid from the inlet to the outlet of the pump there is provided an improved valve member which uses a valve having an elongated body formed from a generally conical coil spring with abutting convolutions. The convolutions are opened when the valve member moves away from the pumping direction and closed when the valve member moves in the pumping direction.

Abstract: An electromagnetic fluid pump having a magnet attached to a reciprocating piston and a Hall effect switch detecting the magnetic field generated by the moving magnet. In a first position of the magnet, the magnetic field through the hall effect switch is in a first direction causing the hall effect switch to generate a signal having a first polarity. In a second position of the magnet the magnetic field through the hall effect switch is reversed, reversing the polarity of the signal generated by the hall effect switch. An electronic switch circuit responsive to the signal generated by the hall effect having the first polarity to energize the solenoid coil to retract the piston from the first position to the second position against the force of a spring and further responsive to the signal having a reversed polarity to deenergize the solenoid coil when the piston is in said second position.