Showing papers on "Solenoid published in 1978"

Three-way solenoid-operated pinch valve assembly

Abstract: A three-way pinch valve assembly is operated with a single solenoid with one pinch valve mounted on each end of the solenoid, one valve will normally be open and the other valve will normally be closed. The plunger of the solenoid is split so that each movable pinch bar of each pinch valve is separately adjustable. A back-up pinch bar for each movable pinch bar is likewise adjustable. A three-way valve is provided by connecting the tubing from the two pinch valves to a T-fitting having a single outlet.

Anti-theft ignition system

Abstract: An anti-theft ignition system including a generally tamper-proof canister or housing substantially covering the solenoid of the starter motor with a portion thereof covering the ignition switch terminal of the solenoid. The housing includes a compartment for receiving electronic circuitry including an encoded circuit coupled to or forming a part of a microcomputer operable in response to proper sequential actuation of the ignition key for energizing a silicon controlled rectifier in series relation with the ignition switch.

Electronically operated portable fastener driving tool

Abstract: An electronically operated portable fastener driving tool is disclosed. Fasteners are driven into a workpiece by a driver blade which is actuated by a solenoid powered by a source of alternating current. Each actuation of the device produces two driving strokes delivered to a fastener. The tool is also provided with means for preventing more than one fastener from being driven during each actuation of the tool. A preferred embodiment in which the device is double insulated is disclosed. Control circuits which permit operation at either 110 V. or 220 V. are also disclosed.

Automatic starting system

Abstract: An automatic starting system for the internal combustion engine of a vehicle includes a settable clock device in parallel with a remote control receiver, a plurality of relays and timed, thermal switches, a thermal switch flasher and a solenoid coupled to the throttle-gas pedal linkage of the vehicle. The relays and timed, thermal switches are arranged to couple current from the battery of the vehicle to the starter and to provide a variety of circuit paths depending upon the particular conditions existing within the vehicle. The flasher alternately energizes and deenergizes the solenoid which is mechanically coupled to pump the gas pedal when the engine is cold, before the time that battery current is coupled to the starter. A number of safety features such as a hood safety switch, an overspeed switch, a temperature switch and a low oil pressure switch, are provided in order to prevent damage to the vehicle and to prevent injury to others.

Dual action solenoid pump

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.

Solenoid operated pilot valve

Abstract: In a Solenoid Operated Pilot Valve, the solenoid plunger serves as a valving element blocking the flow of pilot fluid through orifices disposed at opposite ends of the plunger movement with the plunger being shifted in one direction under the influence of the solenoid coil to block the pilot fluid flow through one orifice and upon de-energization of the solenoid coil the plunger is shifted in the opposite direction by a permanent magnet to block the fluid flow through the orifice at the other end of plunger movement.

Automobile door opening apparatus

Abstract: A remote controlled automobile door opening system having solenoid assemblies for unlocking, unlatching and partially opening the automobile door in response to a remote radio signal. The unlocking, unlatching and partial opening of the door occur sequentially after the radio signal is received.

Electromagnetic rotating apparatus

Abstract: This invention relates to a rotary solenoid or similar electromagnetic rotating apparatus that is capable of smoothly rotating through an angular range of approximately 180 degrees, in both directions, without employing a return spring or other like means.

Heavy vehicle anti-overturning retarder - has centrifugal acceleration detector emitting signal to solenoid operated brake valve and alarm circuit

Abstract: The anti-overturning retarder is for heavy road vehicles with a high centre of gravity, detecting the critical centrifugal acceleration on entering a curve and automatically acting on the vehicle brakes. It has a centrifigual acceleration detector (1) emitting an electrical signal, together with a solenoid valve receiving the signal and actuating the vehicle brakes at the same time as audible and visual signals, e.g. a buzzer and red stop lights at the rear. The detector can comprise sealed housing in which a steel ball (3) on the end of a pendulum arm works in a damping liq. (4).

Electro-hydraulic directional control valve

Abstract: A first front face of a main control spool of a main control valve is loaded with a constant pressure, whereas the opposite face is loaded with a controlled pressure to control the fluid passages to and from a hydraulic actuator. The control pressure is adjusted by means of a two-edge control of the pilot control spool of a pilot control valve which is actuated by a single proportional solenoid against the force of a spring. The advantages obtained thereby result in a substantial savings in manufacturing expenditure and a substantially improved control operation.

Control circuit for resetting circuit breaker UVR solenoid

Abstract: DC control voltage derived from the system voltage activates a first relay to apply the control voltage across a dropping resistor and an undervoltage release (UVR) solenoid, thereby holding the UVR solenoid in while the system voltage remains above a minimum level An energy storage RC network holds the UVR solenoid in for momentary drops in system voltage In the event of a protracted system undervoltage condition, the first relay drops out to drop out the UVR solenoid and trip a system circuit breaker When nominal system voltage is restored, the control voltage activates the first relay and, via an RC charging circuit, temporarily actuates a second relay to switch out the dropping resistor, thereby temporarily applying full control voltage across the UVR solenoid to reset it

Spring actuated, solenoid released brake mechanism

Abstract: A brake mechanism is disclosed wherein a support lever is pivoted at a pivot end to a stationary end plate and is urged by a spring, which engages the support lever at its free end, toward the end plate to effect clamping of a rotatable friction disc between a brake shoe and friction plates disposed near the pivot end of the support lever. A solenoid is mounted on the support lever and is connected to a cam pivoted to the end plate and adapted to contact the support lever near its free end to overcome the force of the spring and to release the brake when the solenoid is energized. The location of the spring and cam near the free end of the lever and the configuration of the lever provides mechanical advantages that permits the use of a smaller solenoid and spring. The arrangement of parts is such that the solenoid mechanical advantage is between approximately 24-32 to 1, depending upon the selected brake releasing clearance, while the spring mechanical advantage is approximately 81/2 to 1.

An implantable permanent left ventricular assist system for man.

Abstract: A new implantable, electrically powered LV AS suitable for long-term use in man has been designed and is under development. The system is based on the well developed high-efficiency pulsed solenoid technology and a careful a priori systems approach to integration of the energy converter with a suitable blood pump. A novel dual pusher-plate sac-type blood pump with significant advantages in hemodynamics, antithrombogenicity and durability has been designed. The complementary energy converter, a pivoted-armature dual-gap solenoid, addresses weaknesses in previous designs while retaining all the good features of its forerunners and provides for the first time a truly integrated implantable circulatory assist system for man.

Die changing apparatus for a bending brake

Abstract: Apparatus incorporated in a bending brake for making selective use of a preselected number of different dies which are to cooperate with reciprocating punches to make various bending operations. The dies are held in respective preassigned storage locations formed by a pair of racks jointly movable in the vertical direction. Disposed opposite to the rack pair of horizontal movement toward and away from same are a pair of die carriers which coact to carry a desired one of the dies out of the rack pair. A pair of die changer arms, pivotally mounted on the frame of the bending brake, transport a die to be replaced, which has been in use on a die bed, from the later on to the die carrier pair and, on their return stroke, transport the desired die which has been just carried out of the rack pair by the die carrier pair from the later on to the die bed. Comprising a set of electrical switches, a die identifier mechanism ascertains the identity of the replaced die and causes the rack pair to receive the replaced die in its preassigned storage location as same is subsequently carried back therein by the die carrier pair. Fluid actuated cylinders under the control of solenoid valves are employed for automatic operation of the apparatus.

The Lead/Liquid Argon Shower Counter Systems of the Spear Mark II Detector

Abstract: The electromagnetic shower detection system of the Mark II Magnetic Detector consists of ten large lead/liquid argon modules. Eight of these, termed "barrel" modules, are placed outside the aluminum coil which defines the magnetic field volume of the device. The other two, the "end-cap" modules are placed at the ends of the solenoid. The design and construction of the lead assemblies, the tank structure and the cryogenic system will be described, as will the data acquisition electronics. Preliminary results on the performance of the first barrel module will be presented.

Impact print head

Abstract: An impact print head for a matrix printer employs the usual set of wires slidably mounted in the head which are selectively extended from the working end of the head toward a platen by energizing solenoid actuators. However, in lieu of the usual solenoid strikers, return springs therefor and print wire return springs, a single set of unitary ferromagnetic spring arms connected directly to the print wires and positioned opposite the solenoids mounted in a unitary solenoid frame assembly. Also a shunt plate is mounted in the head and positioned on the opposite sides of the spring arms from the solenoids. The shunt disk and frame assembly shape the magnetic flux pattern from each energized solenoid so that a maximum number of flux lines from each solenoid intercept the associated spring arm to attain maximum dynamic print range and efficiency. Higher print speed may be attained by preloading each spring arm toward its associated solenoid and substituting for the shunt disk, a set of permanent magnets positioned on the opposite sides of the spring arms from their solenoids. Their magnetic field strengths are such as to overcome the self-biases of the associated spring arms so that each spring arm, when quiescent, is spaced from its solenoid and contains appreciable potential energy. When energized, each solenoid produces a field which is opposite to and at least equal in strength to that produced by the corresponding permanent magnet so that the potential energy stored in the associated spring arm is released as kinetic energy which helps to rapidly move the spring arm to promptly extend the associated print wire.

Energizing circuit for solenoid valve

Abstract: An engergizing circuit for a solenoid valve has a power source connected to a solenoid coil of the solenoid valve through on-off contacts. The energizing circuit includes a capacitor and a solid-state surge absorber which are respectively connected in parallel with the solenoid coil, and the surge absorber is made from a sintered material containing a metal oxide as a principal component and having a non-linear electric resistance characteristic with respect to the applied voltage. By virtue of the solenoid valve energizing circuit constructed as described, when the on-off contacts are separated, the occurrence of an arc between the contacts thus preventing wear of the contacts, while when the solenoid coil is deenergized, the delay time in the return movement of the valve spool is decreased, and moreover the surge voltage produced across the ends of the solenoid coil upon its deenergization is controlled to a predetermined low voltage.

Integrated thermal solar heat pump system

Abstract: A compression module may comprise a hermetic helical screw rotary compressor having injection and ejection ports in addition to discharge and suction ports or may comprise a multiple cylinder, multiple level, reciprocating compressor. The module incorporates a subcooler coil and is connected to an outside air coil, a thermal energy storage coil, a direct solar energy supply coil, one or more inside coils for the space to be conditioned and a hot water coil through common, discharge manifold, suction manifold, liquid drain manifold and liquid feed manifold, by suitable solenoid operated control valves and check valves. The solenoid operated control valves are selectively operated in response to system operating parameters. Seal pots and positive displacement pumps may operate to force liquid refrigerant condensed at intermediate pressure to flow to the receiver which is pressurized at a pressure corresponding to the condensation temperature of the highest pressure condensing coil in the system. Alternatively, liquid refrigerant expansion may be used to reach a common receiver pressure for all condenser returns.

The Electromagnetic Basis for Nondestructive Testing of Cylindrical Conductors

Abstract: Using an idealized model, we deduce the impedance per unit length of long solenoid of many turns that contains a cylindrical sample. The sample with a specified conductivity and magnetic permeability need not be centrally located within the solenoid provided all transverse dimensions are small compared with the free-space wavelength. The derivation is relatively straightforward and it provides a justification for earlier use of the impedance formula. The dual problem , where the solenoid is replaced by a toroidal coil is also considered. It is shown that both excitation methods have merit in nondestructive testing procedures.

Dual solenoid vacuum modulator

Abstract: A dual solenoid pneumatic pressure control valve having two oppositely acting solenoids, each solenoid containing a valve means responsive to solenoid activation signals for controllably opening one of a plurality of pressure communication conduits disposed within the body of the valve to enable modulated pressure communication between a plurality of reference pressure sources and an output port to control a pneumatic pressure responsive actuator.

Fault detector for wheel slip control system

Abstract: A memory circuit increments when sensor fallout or short solenoid energization is detected in a wheel slip control system. A disable or alarm signal is generated when the memory contents reach a predetermined threshold.

Governor apparatus and system

Abstract: A governor system for an engine motive fluid induction system is shown as having a solenoid operated valving assembly communicating with a source of vacuum and with a plurality of vacuum motors operatively connected to variably positionable throttle valves of the induction system; an electronic control sensitive to the speed of a monitored parameter is effective to controllably energize the solenoid valving assembly to, in turn, regulate the magnitude of vacuum directed thereby to the vacuum motors and consequently govern the then permissible amount of opening of the throttle valves.

Impact printer hammer assembly

Abstract: In a solenoid driven hammer for an impact printer, the armature, which is driven by the magnetic field provided by the solenoid's coil, is integral with the hammer which strikes a printing element on a print wheel. The shape of the pole piece in the solenoid conforms to the shape of the leading surface of the armature to provide a magnetic force field that is of constant strength as the armature is propelled toward the pole piece when the solenoid coil is energized. The hammer, being unitary with the armature, is thereby propelled against the printing element. As the hammer rebounds after striking the printing element, the armature strikes a polyurethane cushion which absorbs substantially all of the energy of the armature/hammer unit, thereby bringing the unit to a complete stop so that the next stroke may be quickly commenced.

Solenoid actuated wire feed and tearing apparatus

Abstract: A bonding head of the type having a bonding tool mounted in the bonding tool holder is provided with a pivotable wire clamp which is movable toward and away from the rear of the bonding tool. The wire clamp is pivotally movable to three distinct positions by a single solenoid. The wire clamp is opened and closed by a second solenoid. The solenoids are mounted on the pivot axis of the bonding tool holder in a manner which substantially prevents the shock force of actuation of the solenoid from being imparted into the bonding tool holder or the bonding tool during a bonding operation.

Rotating electromagnetic solenoid motor

Abstract: A motor comprising a plurality of electromagnetic solenoids forming a core passageway for an armature consisting of alternatingly magnetizable and non-magnetic elements. Only one magnetizable element is in an energized solenoid at any given time, thus providing lower current requirements.

Hydraulic control system

Abstract: A hydraulic control circuit especially for use with multi-function hydraulic devices, such as for industrial lift truck attachments, in which a combination of valve means are adapted to operate two or more hydraulic systems, the valve system being designed such that a minimum number of hydraulic conduits are required to connect the main hydraulic system to the hydraulic devices, as from a lift truck to an attachment supporting carriage on a lift truck upright, and no electric lines are required to be connected to switching devices between the hydraulic devices, such as to solenoid operated valves.

Energy dissipation circuit for electromagnetic injection

Abstract: An electronic control unit for regulating the air/fuel ratio of an internal combustion engine is disclosed. The electronic control unit includes an injector driver circuit which regulates the timing of the opening and closing operations of a plurality of electromagnetic solenoid injectors which input fuel to the engine. The injector driver circuit controls the injection with a pulse width modulated signal to supply an amount of fuel calculated from the operating parameters of the engine. The injector driver circuit is further provided with an energy dissipation circuit to assist in the rapid de-energization of the solenoid injectors. The energy dissipation circuit drains the energy stored in the rapidly collapsing magnetic field of a de-energized injector through a power device whose energy dissipation is controlled by the breakdown voltage of a Zener diode connected to the control terminal of the power device. The power device provides a variable conductance which dissipates an amount of energy proportional to the gain of the device times the amount of energy dissipated through the Zener diode. Preferably, the power device can be a final driver transistor used by the injector driver circuit to open and close the injectors.

Copy machine with automatic roll supplied copy paper feeding and cutting apparatus and control circuitry

Abstract: Apparatus and control circuitry used in a copy machine for providing copy paper cut to length in accordance with an original sheet sensed by two switches in the path of travel of the original. A first feed roller is rotated via a clutch upon energization of a solenoid for the cluch when the leading edge of the original is sensed by the first switch with the clutch disengaged upon deenergization of the solenoid when the leading edge of the original reaches the second switch to provide limited movement of the leading edge of the copy paper from a solenoid operated cutter to a second feed roller. The second feed roller continues to pull copy paper from the roll until the cutter is operated by energization of its solenoid upon passage of the trailing edge of the original past the first switch. The cutter solenoid is deenergized when the trailing edge passes the second switch.

Dual stage fluid clutch motor with electric controls including time delay

Abstract: A vehicle transmission with an automatic clutch is disclosed in which for gear shifting the clutch is disengaged with the assistance of a vacuum from a source of vacuum, via a control valve having a solenoid actuated clutch release valve and a clutch servo. Disengagement of the clutch is carried out when a gear shift lever is manipulated with an engine accelerator released. The reengagement of the clutch commences as soon as the flow of current to the solenoid for the clutch release valve is cut. The clutch release valve then disconnects the clutch servo from the source of vacuum. The reduction of the vacuum in the clutch servo takes place in two stages. In the first stage, the vacuum is reduced very quickly by means of a solenoid actuated air-on (air bleed) valve for a predetermined time after the flow of current to the solenoid for the clutch release valve has been cut until the clutch begins to engage or is about to engage. Current is supplied to the solenoid for the air-on valve when current is supplied to the solenoid for the clutch release valve. A delay means is provided whereby, after the predetermined time after the flow of current to the solenoid for the clutch release valve has been cut, the flow of current to the solenoid for the air-on valve is cut.

Carburetor and method of calibration

Abstract: A carburetor controlled by a pulse width modulated duty cycle operated solenoid has a main metering rod and an idle bleed valve spring biased against a bracket carried by the solenoid armature. The armature is spring biased to a rich position against an adjustable stop and is pulled by the solenoid coil to a lean position against a portion of the solenoid coil assembly. The entire coil assembly is spring biased against a stop which is adjusted to establish the lean position of the metering rod and bleed valve.