Showing papers on "Solenoid published in 1973"

Solenoid operated electric strike

Abstract: An electric strike with a pivotally mounted catch which is locked by a pivotally mounted detent engageable with a pivotally mounted detent arm controlled by the catch, movement of the detent being controlled by an electrically energizable solenoid and moveable core assembly which has a portion of the core extending outwardly of the solenoid, the core being pivotally interconnected with the detent and said portion of the core moving inwardly of the solenoid upon energization of the latter The detent arm may be omitted and the detent may, in such case, engage a pin carried by the catch

Internal combustion engines

Abstract: An internal combustion engine has inlet and/or exhaust valves which are held in open or closed positions by magnetic field generated by a solenoid. Resilient means are provided to bias the valve against the action of the magnetic field. The magnetic field is generated periodically, as a function of engine speed, by activation of a scanning means activated by light or other radiation periodically being allowed to pass to the scanning means by way of an aperture in a mask.

Modular solenoid-operated dispenser

Abstract: A solenoid-operated dispenser for dispensing liquid materials. The dispenser comprises a heated service module which contains static parts, a gun module which contains all of the movable parts of the dispenser, and a plug-in solenoid coil module, all three modules of which are resiliently held in an assembled relationship by a single threaded nut.

Classical Electromagnetic Interaction of a Charged Particle with a Constant-Current Solenoid

Abstract: The classical electromagnetic interaction for a charged particle with a long, constant-current solenoid is investigated in the context of classical electromagnetism. The conservation laws connected with energy, linear momentum, and angular momentum are first verified. Then the changes in the electromagnetic field quantities are evaluated explicitly, and the values are seen to have interesting connections with the solenoid vector potential. The calculations are of interest in connection with the Aharonov-Bohm effect involving the passage of electrons past a solenoid, and the classical expressions for energy and momentum are reminiscent of terms in the quantum-mechanical calculations.

Solenoid valve with electronic position indicator

Abstract: A solenoid valve with an electronic position indicator in which the armature of the solenoid coil means is itself the movable valve member or is operatively coupled with the movable valve member characterized in that the solenoid coil means is hooked up as an inductance bridge to an AC power source, the armature being effective to vary the relative inductances of the legs of the bridge according to the position of the armature with respect to said solenoid coil means, the voltage drops at the juncture of the legs being compared with in-phase reference voltages and resolved by a phase detector having an output which indicates the position of the armature and thus indicates the position of the valve. The invention herein is further characterized in that the armature is actuated by DC energization of the solenoid coil means and in that the position indicator has condensor means to prevent the DC voltage from entering the position indicating circuitry.

Safety attachment for appliances subject to fluid leakage

Abstract: An attachment for an appliance having a fluid inlet conduit, the attachment having a pipe fitting with oppositely extending couplings adapted to be mounted on the conduit so as to link segments thereof in fluid transferring relation and having an internal valve seat disposed between the couplings; a solenoid mounted on the fitting, a valve closure borne by the solenoid for movement to and from the valve seat; a fluid sensitive switch positioned for exposure to fluid leakage from the appliance; and an electrical circuit including a power source interconnecting the switch and the solenoid in controlling relation.

Computer operated solenoid valve pressure control system

Abstract: A computer operated solenoid valve pressure control system is disclosed. The apparatus of the system includes a computer, equipment which converts the computer instructions to electrical power to operate solenoid valves which with associated components pressurize or depressurize a closed volume, and a pressure measuring system which provides feedback to the computer. In applications where the pressurized device varies in volume or there is flow through the pressurized device, the pressure from the closed volume is fed to a pilot regulator system.

Magnetic trolley conveyor system

Abstract: A conveyor system has trolleys propelled by the friction of a non-magnetic moving belt and the attractive force of a magnet acting through the belt to a stationary metal keeper plate behind each moving belt. Trolleys are switched between rails by means of a solenoid actuated lever roller, operatively positioned behind the driving belt, which pushes the trolley away from its keeper toward a ferrous sheave that has a non-magnetic belt thereon. A magnet on the sheave side of the trolley attracts the trolley toward the sheave and causes the guide rollers of the trolley to follow the desired switch rail.

Fire detection and extinguishing system

Abstract: A fire extinguishing system in which an optical flame detector, on seeing radiation from a fire, causes energization of a solenoid valve to release an extinguishant. Means responsive to the pressure created by the released extinguishant creates an additional circuit to the solenoid to lock it in the energized condition. Manual means is provided for operating the valve, in which case the pressure responsive means energizes the solenoid to insure continuous and complete discharge of the extinguishant. Timing means is also provided to open the solenoid after a predetermined time.

Electronic pilot ignition and flame detection circuit

Abstract: An electronic pilot ignition and flame detection circuit for use in a fuel ignition system including a spark ignition circuit operable when energized to generate sparks for igniting gas emanating from a pilot source, a switching circuit including a normally de-energized relay and a normally non-conducting silicon controlled rectifier which controls the relay, and a pilot flame sensing circuit operable as a pulse generating circuit for sensing the pilot flame and providing pulses of a first amplitude for enabling the silicon controlled rectifier to effect energization of the relay whenever the pilot gas is ignited to cause the spark ignition circuit to be de-energized and to prepare an energizing path for a main burner gas valve solenoid. The flame sensing circuit provides pulses of a lower amplitude whenever the pilot flame is extinguished to preclude enabling of the silicon controlled rectifier, such that the relay is disabled causing the energizing path for the gas valve solenoid to be interrupted and the spark ignition circuit to be re-energized. Alternatively, the gas valve solenoid may be substituted in the circuit for the relay coil to be controlled directly by the silicon controlled rectifier. In such a case a separate self extinguishing pilot relight circuit controls the pilot ignition.

Anti-skid brake control system

Abstract: An anti-skid brake control system includes a power booster interposed between a master cylinder and a brake pedal, and first and second solenoid valves electrically connected to a computer which generates first and second signals therefrom in response to wheel locking conditions, the second signal of which may be generated a predetermined time after the first signal is terminated whereby the first solenoid valve serves to reduce the hydraulic pressure within the booster upon reception of the first signal from the computer so as to release the brake pressure to the wheels and the second solenoid valve serves to gradually increase the reduced pressure within the booster upon reception of the second signal from the computer so as to recover the brake pressure whereby a substantially ideal anti-skid braking operation can be performed

Combination monostable and astable inductor driver

Abstract: A driver is disclosed that is particularly adapted to deliver excitation to solenoids characterized by a high ratio of pull-in current to holding current. In order to minimize the continuous current rating of a solenoid required in a given application, the solenoid is pulsed with holding current after pull-in is effected. The driver employs solid state timing circuitry having monostable and astable modes of operation controlled by capacitors provided with independent charging and discharging circuits. After the initial, monostable mode in which the driving excitation is uninterrupted, the timing circuitry automatically goes into the astable mode to pulse the solenoid in accordance with a predetermined duty cycle which may be set at either less than or greater than fifty percent throughout a wide range as required.

Solenoid having increased throw capability

Abstract: A solenoid for actuating a print wire normally biased against the impact direction by novel spiral spring means. Energization of the solenoid coil rapidly moves the print wire in the impact direction against the bias of the spring. Release of the energy supplied to the solenoid coil causes very rapid return of the print wire to the non-printing (i.e., quiescent) position. The novel spiral spring structure experiences a substantially linear spring force upon deflection and provides significantly increased deflection as compared with conventional structures to allow for substantially rapid initial acceleration of the print wire in the impact direction while providing for rapid return of the print wire to the quiescent condition. The mounting of said spring reduces bouncing on overshooting.

Electronically controlled solenoid regulated servomotor

Abstract: An electrical circuit for operating a solenoid controlled servomotor which supplies an operational fluid under pressure to the wheel brakes of a trailer in response to an actuation signal which is transmitted to the wheel brakes of a tow vehicle.

Three-way solenoid valves

Abstract: The ball-type three-way solenoid valve has coil wound on a yoke enclosing a fixed core tightened therein; a longitudinal passage formed in said core receives in a widened portion thereof a spring-loaded sliding valve member, the coil yoke and ball seat consisting of a single member moulded from suitable plastic material; this member comprises a metal insert for closing the magnet flux path through said ball and has formed therein a central longtudinal opening into which are introduced in succession a copper-coated ball, the coil compression spring with its valve member having a hexagonal cross-sectional contour, with its gasket, and the electromagnet core, the conducting coil being subsequently wound on said yoke, and sealing gaskets disposed at the longitudinal ends of the moulded member are eventually introduced; a shield of folded and pressed sheet metal encloses only partially said coil and is crimped on said moulded member and at the upper end of said core. (FIG. 3).

Hydraulic valve operator and remote control

Abstract: A mobile machine for cleaning sewer and like pipes has a water reservoir connected through an engine driven pump and plumbing to one end of a hose coiled on a rotatable reel, the other end of the hose having a discharge nozzle for entering the pipe to be cleaned. A hydraulic ciricuit is provided for actuating a water shut off valve in the plumbing and for control of speed and direction of rotation of the reel, and a remote control device is provided for operating solenoid valves in the hydraulic circuit. The water shut off valve may be operated by electric motor independently of the hydraulic circuit.

Sewing machine accessory apparatus

Abstract: A sewing machine accessory device including a solenoid actuated actuating rod adapted to be extended in selected combination within a stitch advance sequence of the sewing machine for selectively piercing the fabric by tools attached thereto in coordinated combination with a particular sewing sequence. In another embodiment the tools attached include a color dispenser extended selectively to contact the fabric, or a plurality of color dispensers radially disposed for rotation to contact selectively the fabric.

Variable height and variable spring rate suspension system

Abstract: A vehicle on tracks has a torsion bar and tube suspension for a variable spring rate, and the torsion bar anchor is pivotable to rotate the road arms of the wheels to vary ground clearance. Hydraulic rams, one for each side, have piston rods that are seized at zero pressure for ''''fail-safe'''' characteristics. System pressure is applied through solenoid valves to remove the grip on the piston rods. Primary hydraulic pressure depends on an engineoperated pump, but the driver can operate an emergency pump to control vehicle height. If electric power to the solenoid valve fails, the operator controls other valves to bypass the electrical system controls.

Steam generating and control system

Abstract: A steam generating and control system for supplying steam to a steam iron in accordance with the steam requirements of the iron. The system includes a water supply pipe through which water is supplied serially to a pressure regulator and a first solenoid valve. The first solenoid valve leads to a steam generating chamber and a second solenoid valve controls the communication between the steam generating chamber and the steam iron. A microswitch is operatively associated with the iron and upon being actuated opens each of the solenoid valves to allow water to be directed to the steam generating chamber and the steam formed therein to be transferred to the iron.

Electromagnetic motors and process of their operation

Abstract: Electromagnetic reciprocating piston motors operate at wide speed range without changing direction of magnetic flux through the pistons and while positively maintaining the direction of flux in the pistons and while commutating triggering current to selected solenoid coils at low voltage.

Electrical control system for automatic vehicle transmission

Abstract: An electrical control system is provided for automatic vehicle transmissions wherein the speed changing operation of a vehicle driving system is effected in response to the energization or deenergization of the solenoid coils of gear shifting solenoid valves. The electrical control system includes an operating section comprising an MOS large scale integrated circuit which performs necessary logical operations on digital signals corresponding to the vehicle speed and throttle valve position and digital signals indicative of the selected shift condition and driving condition whereby the solenoid coils are energized by the shift control signals produced from the operating section. Thus, the electrical control system is extremely compact as a whole and inexpensive to manufacture.

Solenoid powered brake pressure modulator

Abstract: A brake pressure modulator for a hydraulic brake system in which the modulator is powered by a solenoid. The solenoid reciprocates a plunger to pump hydraulic fluid to the brakes to increase the pressure after the brakes have been released to avoid a wheel lock condition. The solenoid also acts when it is energized to isolate the master cylinder from the brake applying wheel cylinder and at the same time opens communication between the wheel cylinder and a reservoir to relieve pressure and release the brakes.

Electrical safety device

Abstract: A solenoid coil is connected to be energized by current through a ground wire in an electric plug The solenoid plunger axial movement is converted to rotary step movement of an actuator which controls the operation of switch contacts connecting the power cord to the plug prongs Power to the cord is interrupted when current flows through the ground wire The contacts may be reset by manually moving the solenoid plunger or may be electrically reset by an external power supply to the solenoid

Magnetic fields produced by a hollow superconducting cylinder and a coaxial solenoid

Abstract: Numerical solutions have been obtained for the magnetic field produced by eddy currents induced in a hollow superconducting cylinder by a centered coaxial solenoid. As the dimensions of the cylinder and the solenoid are arbitrary, the solutions are useful in the design of many types of cryogenic apparatus. The results of studies of the performance of superconducting shields as a function of the length‐to‐diameter ratio, of the effectiveness of a shield in containing the field of an interior solenoid, and of the use of a superconducting cylinder to homogenize the field produced by a solenoid are discussed. The conclusions apply to all thin‐walled conducting cylinders as long as the wall thickness is greater than the skin depth at the frequency of interest.

Proportional solenoid actuator

Abstract: A solenoid device which provides an output force proportional to input signal amplitude regardless of the position of the solenoid plunger is disclosed. A flux measuring device is located in the magnetic circuit of the solenoid and provides a signal proportional to flux density. This flux density proportional signal is employed for control purposes to vary the solenoid coil excitation as a function of the input signal and the desired output force.

Search for magnetic-monopole production by 300-GeV protons

Abstract: In a search for magnetic monopoles, a steel beam dump has been exposed to 3.4 × 1016 protons of 300 GeV energy at the National Accelerator Laboratory. The search apparatus employed an 80-kG solenoid 50 cm long capable of extracting a monopole and accelerating it through a series of thin scintillation counters. A monopole would have been identified by its energy loss and range in the scintillators. No monopoles with magnetic charges in the interval from 1/6 to 24 times the Dirac magnetic charge were found. Finally, the upper limit at a 95% confidence level for the cross section per nucleon on iron is 6 × 10-42 cm2.

Hydraulic speed change control device

Abstract: A hydraulic speed change control device for use in transmission gears of crawler tractors of the kind comprising control means for gradually increasing the pressure of hydraulic fluid to be fed to a fluid torque convertor and control means of a speed change mechanism for controlling the amount of return of hydraulic fluid to activate clutches of a planetary speed change mechanism, characterized in that said control means of the speed change mechanism includes a plurality of spools and solenoid valves associated therewith, each of said solenoid valves being adapted to cause a pressure differential between both end faces of each of said spools, said pressure differential acting on each of said spools to move the latter.

Electro-mechanical actuator

Abstract: An electro-mechanical actuator for providing linear reciprocal motion which translates the short, abrupt linear stroke of a solenoid into a longer stroke of more uniform force on an actuating rod. The linear motion of the solenoid armature is coupled through a large spring adjacent a piston lying in a first chamber filled with a hydraulic fluid. A second chamber in communication with said first chamber houses a smaller diameter piston having an actuating rod disposed from one side. An accordion-like chamber adjacent the rod seal protects the seal from dust or damage.

Staging of theta pinches using laser‐heat addition and magnetic compression

Abstract: The thermodynamics of using laser heating in conjunction with magnetic compression in θ‐pinch plasmas is discussed. It is shown that the minimum laser energy required to achieve a given plasma filling factor Λ (ratio of plasma to plasma tube area) is Elaser = Λ2/3Eplasma and that any filling factor up to Λ = 1 can be achieved. The proposed schemes have important implications for either increasing the performance of standard θ pinches or for replacing the single‐turn θ‐pinch coil by a multiturn solenoid.