Showing papers on "Solenoid published in 1968"

Structural defect monitoring device

Abstract: This invention relates to a system for a detecting and monitoring structural defects in mechanical structures such as the skin of an aircraft. The system comprises a group of elongated conductive tapes of known electrical resistance bonded to the aircraft skin but insulated from it at a point which has a history or likelihood of failure. One end of the group of tapes is electrically grounded while the other is electrically connected to a resistance comparing or measuring device, as for example, an ohmmeter. A visual or audible warning device is provided in the form of a light or buzzer including a solenoid holding circuit to hold it on once energized. Thus when a crack or tear occurs in the aircraft skin the warning light or buzzer is energized and a reading of the ohmmeter shows the extent of damage by the degree of resistance change.

Electromechanical door lock system

Abstract: An electromechanical door lock system that has a housing with a lock bolt that is resiliently biased to a retracted position with a solenoid operated latch that holds the lock bolt in the extended, locked position, and the housing has openings for mechanically locking and unlocking the bolt, and a timing circuit for selectively energizing the solenoid to release the lock bolt, which timing circuit has override switches for controlling the position of the lock bolt independently of the timing circuit.

Automotive door lock

Abstract: An automotive door lock arrangement comprising a door lock of latch type provided for each of all doors of an automotive vehicle, said arrangement being characterized by the provision of: a solenoid coil assembly comprising a locking coil means and an unlocking coil means provided for each of said doors, an automatic switch means connected with the driver''s solenoid assembly for sensing starting of said vehicle, electric wiring means connecting all of said solenoid assemblies with each other, said door locks being actuated thereby into their locking position when the driver''s locking coil means is energized for locking by receiving an electrical signal depending upon said energization.

Transient Resistance of Conductors

Abstract: Practical calculations of transient resistance effects in conductors are reported. Included are the current density distributions in cylindrical and semi-infinite solid conductors for an applied surface step electric field E, and the density in a flat wide conductor. Two analogies are used to yield useful results: thermal diffusion in a cylinder and voltage transients on a semi-infinite transmission line. Results are applied to the calculation of time constants of a transmission line and force build-up in a solenoid.

Fuel burner ignition

Abstract: A system for igniting a fuel burner includes an electrically operated solenoid valve for controlling the flow of fuel to the burner, the valve having a pair of windings. An electric resistance heating element having a positive coefficient of resistance relative to temperature is mounted adjacent the burner in order to ignite fuel flowing from the burner. A control circuit operates to connect the heating element and one coil of the solenoid winding in series for simultaneous energization of the valve and the heating element. In order to assure operation of the valve when the heating element is initially in a hot, high resistance condition, the other coil of the solenoid winding is connected in series with a variable resistance having a negative resistance coefficient relative to temperature.

Solenoid construction means or the like

Abstract: A solenoid construction wherein a pull coil means is only adapted to move a plunger means from its deenergized position to a position intermediate its deenergized position and its fully actuated position when the pull coil means is energized whereby the plunger means when disposed in its intermediate position is adapted to be influenced by a hold coil means so that when the hold coil means is also energized the same will move the plunger means from its intermediate position to its fully actuated position and hold the plunger in its fully actuated position regardless of whether or not the pull coil means remains energized.

Superconducting magnet for persistent operation

Abstract: AN APPARATUS FOR PROVIDING A SUPERCONDUCTIVE MAGNET OF NIOBIUM-TIN RIBBON FOR PERSISTENT OPERATION AND INCLUDING AS NOVEL MEANS FOR ALLOWING THE COIL WINDING ENDS TO BE EXTRACTED FROM THE WINDING BOBBIN WITHOUT KINKING, A NOVEL MEANS OF SPLICING THE ENDS OF THE SUPERCONDUCTIVE RIBBON TO A PERSISTENT SWITCH MEANS, AND A MEANS FOR SUPPORTING THE SPLICED RIBBON OUTSIDE OF THE INTENSE MAGNETIC FIELD PRODUCED BY THE SOLENOID.

Two ``Whisker'' Straining Devices Suitable for Low Temperatures

Abstract: Two devices for straining ``whiskers'' are described. In the first device, the whisker is mounted on a Mylar film that is stretched by a differential screw. The entire device can be immersed in liquid helium, which eliminates thermal expansion problems in low temperature experiments. In the second device the whisker is mounted between two bimorphs of piezoelectric material. The piezoelectric puller is small enough to fit inside a 2.5 cm i.d. superconducting solenoid and still permit the entire device to be rotated about an axis perpendicular to the solenoid axis.

System for automatic control of gas pressure

Abstract: 1,205,277. Automatic pressure control. SARTORIUS-WERKE G.m.b.H. April 9, 1968 [April 12, 1967], No.17112/68. Heading G3R. A desired pressure is maintained in a chamber supplied with gas through a series arrangement of reducing valve, solenoid valve and control valve, and exhausted through a series arrangement of control valve and solenoid valve by electrical means, responsive to the pressure, controlling the solenoid valves and a motor-operating one of the control valves. As shown, nitrogen from a high-pressure source 1 is supplied to a receiver 5 through a pressure reducing valve 2, solenoidoperated valves 3, 3 and differently adjusted throttle valves 4, 4. Gas is withdrawn from the receiver by a pump 11 through a solenoid-operated valve 10 and a motor-operated valve 8. A gauge 6 produces an electrical signal, corresponding to receiver pressure, which is compared with a reference signal so that any error is effective to operate a galvanometer 7. Light responsive pickoffs associated with the pointer of galvanometer 7 maintain receiver pressure between predetermined limits. At the upper limit valve 10 is opened and the opening of valve 8 gradually increased. At one lower limit one valve 3 is opened and at a still lower limit both valves 3, 3 are opened. The pressure datum may be varied with time by a timer 12 causing step by step adjustment of resistances which determine the value of the reference signal. Use of only one set of valves 3 and 4 and location of motor -operated valve 8 on the input side of the receiver are referred to.

Solenoid operated actuator system

Abstract: A STABLE, PROPORTIONAL CONTROL SYSTEM HAVING AN ACTUATOR CHARACTERIZED BY A FIRST STAGE COMPRISING AN INTEGRATING PILOT PISTON, THE FLOW OF OPERATING FLUID TO THE PILOT PISTON CHAMBER BEING CONTROLLED BY OPPOSED SOLENOID OPERATED VALVES. THE SOLENOID OPERATED VALVES ARE RESPONSIVE TO AMPLIFYING AND SWITCHING CIRCUITRY FOR HAVING AN ACCURATELY CONTROLLED DEADBAND, THE SWITCHING CIRCUITRY BEING RESPONSIVE TO COMMAND SIGNALS AND PILOT PISTON POSITION FEEDBACK SIGNAL. THE PILOT PISTON, VIA A SUITABLE LINKAGE, CONTROLS THE OPERATION OF VALVES WHICH CONTROL THE DELIVERY OF OPERATING FLUID TO A SECOND STAGE IN WHICH IS DISPOSED A LOAD CONNECTED, DIFFERENTIAL ARE SLAVE PISTON.

A quasi-D.C. plasma accelerator for injecting plasma into a transverse magnetic field

Abstract: A simple plasma accelerator that injects plasma across a magnetic field is described. The accelerator consists of two disk-shaped electrodes 1 cm in diameter and placed 5 mm apart in the magnetic field of a long solenoid. The electrodes are oriented so that the current flow is perpendicular to the magnetic field with j × B directed away from the accelerator. A fast acting gas valve, built into the anode, squirts hydrogen into the inter-electrode gap as a lumped parameter pulse line is discharged across the electrodes; a plasma stream is produced which crosses the magnetic field as well as spreading along the field lines. Typical operating conditions are: voltage drop 150 V, current 60 A, pulse time 100 μsec, magnetic flux density 2 kG, ion energy 100 eV, total number of ions produced 6 × 1015. A simplified accelerator has been made by using electrodes of hydrogen loaded titanium; in this case the anode automatically dispenses hydrogen during the current pulse and the fast acting gas value is unnecessary.

Microwave switching device employing a reed switch element

Abstract: A switching device for tuning a hollow waveguide transmitting microwave signals, including a resonator comprising a section of the waveguide, a reed switch disposed in a normally open state interiorly of the resonator section, and a solenoid mounted exteriorly on the waveguide in proximity of the reed switch, the solenoid energized by a switching signal for providing a magnetic field to actuate the reed switch to a closed state to tune the resonator to a midfrequency of a first preselected frequency band of microwave signals to reflect the latter signals in the waveguide; the solenoid deenergized in response to a discontinuance of the switching signal for terminating the magnetic field to permit the switch to return to the normally open state to tune the resonator to a midfrequency of a second preselected frequency band of microwave signals different from the first preselected band of microwave signals to transmit the latter signals in the waveguide.

Electronic marker actuator

Abstract: An electronic marker actuator for use with an agricultural device such as a planter that is provided with a pivotally connected marker which may be disposed in a substantially vertical position at one time, and released so as to be disposed in a horizontal position at another time, with pushbutton means disposed on the planter and catch means normally maintaining the marker in an upright position, and solenoid means operatively connected to the pushbutton means so as to actuate the catch means and release the marker from its upright position to a horizontal position.

Mechanical stresses in bonded plane helical solenoids with arbitrary external field

Abstract: The paper deals primarily with the elastic stresses in homogeneous (bonded) plane helical solenoids which are inner members of multicoil systems. The terms `bonded' and `unbonded' are defined with regard to solenoid types and conditions under which they operate. Distinction is made between the treatment required for bonded and unbonded solenoids, the work of other authors being clarified in this respect. The case of an infinitely long homogeneous solenoid with non-zero external field is analysed and expressions for the stresses are derived. These formulae are sufficiently manageable to be used in the preliminary design study of real solenoid systems with some loss in accuracy. They are directly applicable under certain conditions for the stress analysis of real solenoids. A set of computed stress curves are included in an appendix.

Beer-dispensing faucet

Abstract: A beer-dispensing faucet; a beer-dispensing faucet designed for automatic operation by a solenoid so automatic equipment may be used to dispense the beer from the faucet without the bartender utilizing a hand lever.

Automatic flushing device for commodes

Abstract: AN APPARATUS FOR AUTOMATICALLY FLUSHING TOILET COMMODES HAVING A SOLENOID AND ASSOCIATED LINKAGE THAT IS ACTUATED BY A CONTROL ELECTRIC CELL OR OTHER SWITCHING DEVICES

Burner control system

Abstract: THE PRESENT INVENTION PROVIDES A BURNER CONTROL SYSTEM FOR USE IN A FURNACE OR THE LIKE THE SYSTEM INCLUDES SWITCHING CIRCUITRY CONTROLLING ENERGIZATION OF A SOLENOID OPERATED FUEL VALVE, TRIAL CIRCUITRY FOR INITIALLY OPENING THE FUEL VALVE AND ESTABLISHING IGNITION AT THE BURNER, AND FLAME SENSING CIRCUITRY WHICH MAINTAINS THE FUEL VALVE OPEN IN RESPONSE TO THE PRESENCE OF FLAME AT THE BURNER THE SYSTEM IS THERMOSTATICALLY CONTROLLED IN ACCORDANCE WITH THE TEMPERATURE OF THE HEATED MEDIUM

A solenoid actuator and a solen oid actuated fluid control valve

Abstract: 1,125,102. Valves. WESTLAND AIRCRAFT Ltd. 1 March, 1966 [3 March, 1965], No. 9132/65. Heading F2V. [Also in Division H1] A solenoid actuator, e.g. for operating a fluid flow control valve, comprises a magnetic circuit including a magnetic element, i.e. a plunger 1, connected therein by two non-magnetic gaps, the element being mounted so as to be capable of movement along a path at least one end of which is determined by a stop and of being maintained in said stop position, when not actuated, by a biasing means or spring 10, and means, i.e. a core 15, responsive to electric current for producing in the magnetic circuit a flux whose magnitude is related to said current, the two non-magnetic gaps being so proportioned and disposed that movement of the element is related to the current and to the biasing force. As illustrated in the Figure, the magnetic circuit comprises the following items of magnetic material: an adjustable bush 2, an outer solenoid shell 3, an end body comprising a fluid inlet 4, a fixed bush 5 and element or plunger 1. The flux path 21 lies within said magnetic material except for the gaps between the respective end portions of plunger 1 and the bushes 2 and 5. Fixed to the plunger is a non- magnetic top bearing 8 slidably mounted in bush 2. A bottom bearing 7 fixed in bush 5 supports a guide member 6 attached to plunger 1, the guide member acting as a valve member co-operating with a valve seat 13. A solenoid coil 15 wound on non-magnetic former 16 when excited moves the plunger 1 against compression spring 10 so that movement of the plunger is related in a predetermined manner to the current in the solenoid coil and to the biasing force of the spring. Movement of the plunger allows fluid to flow in through inlet 41 over coil 15 and exit through outlets 18.

Results of tests on models for an 88-kG, 51-cm-bore-diameter solenoid.

Abstract: As part of a program to build an 88 kG, 51‐cm‐bore solenoid, two model coils were built to test the conductor characteristics as well as the final coil‐construction techniques. The first coil was wound with a square conductor 0.218 cm on a side, with many strands of Nb–Ti. The coil winding i.d. was 15.24 cm, the o.d. was 22.3 cm, and the length was 10.16 cm. This coil was built using small cooling passages, and its construction was such as to simulate the techniques to be used up to 80 kG in the full‐size magnet. The second coil was wound with steel reinforced Nb3 Sn of over‐all dimensions 1.27 cm by 0.0292 cm and had a winding i.d. of 12.2 cm and an o.d. of 31.1 cm, and consisted of two pancakes. Its purpose was to simulate the high‐field windings of the full‐size coil. Both coils were instrumented with heaters to determine their stability characteristics. The performance of each coil is discussed with regard to stability, charge rate, and quench characteristics.

Automatic film advancing mechanism

Abstract: A film advancing mechanism includes a drive motor which is connected to a battery through a normally open switch actuated by a solenoid which is energized an adjustable interval following the camera shutter closing by means of an adjustable RC time delay network. The solenoid is maintained energized only by an AC current produced by the rotating motor. An RC delay network and amplifier responsive to the deenergization of the motor prevents the release of the shutter an interval following the motor deenergization to permit the relaxing of the advanced film frame.

Improvements in or relating to filtering apparatus

Abstract: 1,128,061. Filters for liquids. M.E.L. EQUIPMENT, CO. Ltd. 14 April, 1966 [21 May, 1965], No. 21618/65. Heading B1D. In apparatus of the kind in which filtration occurs through a portion of a strip of filter medium located over a perforate portion of a tank bottom, and the strip is moved automatically on attainment of a predetermined level of unfiltered liquid owing to accumulation of residue upon the strip, the filtrate is received in a suction chamber beneath the tank; preferably there is included a valve, operated by a solenoid in the controlling electric circuit, for relieving the vacuum normally existing in the suction chamber. This valve is opened to admit liquid (e.g. filtered liquid) or air to the suction chamber during a specified interval before the filter-medium operating mechanism is started, so that movement of the medium is not impeded. As shown, paper, cloth or the like 6 from a roll 7 is located by conveyer 11 having transverse flight bars (not shown) on a perforated plate 4 at the bottom of a tank 1. Suction is applied to a chamber 3 by a centrifugal pump 5. When a float-operated switch 26 is closed by rise of liquid level, the following sequence takes place: (a) the vacuumrelieving valve (not shown) is opened and pump 5 is stooped; (b) after a delay of, e.g., three seconds a motor 18, driving conveyer 11 and rollers 9, 10 and 23, is started, to remove and replace the soiled portion of strip 6 on plate 4; (c) after a predetermined time, e.g. 7 seconds, the vacuum-relieving valve is closed, the conveyer is stopped and pump 5 restarted; (d) switch 26 opens, restoring the circuit to its normal condition. In the filtration of high-viscosity liquids, the vacuum-relieving valve admits liquid from a filtrate tank 2. In the filtration of lowviscosity liquids, pump 5 remains in operation while the valve admits filtrate from tank 2, when a continuous supply of clean liquid is required. Where an intermittent supply of low-viscosity liquid is permissible, pump 5 is stopped and the valve admits air. The float-operated switch may be replaced by a pressure-operated switch or by a relay device operated by one electrode and the tank or by two electrodes.

Hot melt glue applicator

Abstract: A hot melt glue applicator including a console for housing controls and a tank containing hot melted glue and at least one glue carrying hose connected with an external glue gun. The device includes separate heaters for the tank, the hose and the gun, an improved solenoid pump for the gun, an automatic fluid pressure release device to prevent hose failure due to high expansion rate of the melting glue, and a pneumatic pump for pumping the glue through the glue carrying hoses to the gun in which seals and packings are eliminated.