Abstract: In an electrical spot welding machine having sensor leads for monitoring weld nugget resistance connected to the electrodes or to the welding current conductors, the voltage component induced in the sensor leads due to inductive coupling is cancelled out by inducing a substantially equal and opposite compensating voltage in the sensor leads. For this purpose an inductance coil may be connected into one of the sensor leads and appropriately positioned on one of the welding current conductors. A core-less coil can be employed, and correct adjustment of the compensating voltage can be achieved by adjusting the coil angularly with respect to the axis of the welding current conductor.

Abstract: There is presented various methods and articles utilizing heat shrinkable and heat sealable sheets, films and materials.

Abstract: Inversion-protection of an outboard marine engine is achieved by fitting inside the engine casing watertight boxes to enclose the water-sensitive electrical components, i.e. the engine starter solenoid and the power pack. The starter motor spindle is provided with a shaft seal and the engine exhaust is fitted with an exhaust pipe in the form of a vertical hairpin or U-tube. The engine air intake box has fitted inside it a horizontally sliding valve that is automatically closed by a vertically-sliding weighted wedge engaging the valve rod.

Abstract: A device is provided for use on vehicles having the gas tank inlet opening located behind a license plate, to hold the license plate open for access to the gas tank inlet opening. The device has a clip which is attached to a backing plate to which the license plate is attached. A second portion of the device is rotatably attached to said clip and is spring-biased with respect to the clip. When the license plate is in the open position, the second portion of this device has an arm which can be positioned to engage an adjacent surface of the bumper, or another adjacent surface of the vehicle. When the lever is placed in this position, the force of the spring will hold the license plate and backing plate in the open position. The second portion also includes a wire member, comprised of a single piece of wire, having its ends wrapped around the clip.

Abstract: A missile launcher having fore and aft two-stage double-acting ejection rams is provided with a choked flow gas system to prevent interaction between the rams and avoid back pressure in the breech chambers. Two gas cartridges in two breech chambers supply ejection gas pressure and a third cartridge in a third breech chamber supplies gas for subsequently retracting the rams. The ejection gas pressure also actuates mechanisms for releasing fore and aft missile suspension hooks and crutching assemblies, and for withdrawing an umbilical electrical service plug. Each ram comprises an outer casing, an inner fixed hollow shroud tube and two relatively-moving members with annular pistons that extend telescopically from within the space between the casing and the shroud tube, the ejection gas being admitted down the interior of the shroud tube. The aft ram has a yoke to engage the missile and the forward ram a side plate.

Abstract: A compact, light weight, high speed, dot matrix printing head comprises a generally circular array of stylus drivers. The printing head employs a generally circular permanent magnet common to all drivers and mounted centrally of the device. Each driver includes an arm having a stylus secured at one end thereof generally perpendicular to the arm and an armature of an electromagnet mounted on the other end of the arm. A magnetic circuit of each driver includes a section of the permanent magnet and bucking coil electromagnet in a short generally rectangular structure with the armature located at one corner of the structure such corner formed by a pole of electromagnet and a pole of the permanent magnet. The arm is carried on crossed flexures providing a pivot point for the arm in the plane of the interface of the armature and pole of the electromagnet to reduce wear. The arrangement of the structure causes the air gap forces to produce moments which are additive.

Abstract: A received video signal that has been inverted at the transmitter is reinverted by the use of low cost pin diodes to reverse the ground and signal lead connections to the primary winding of a transformer operating at RF frequencies.

Abstract: A container for handling small sensitive electronic components having lugs to which wires may be attached, is disclosed. The container is comprised of cardboard having a conductive metallic coating on a surface thereof. The container has a portion (i.e., a hump) on which the electronic components are securely placed so that the lugs are all electrically interconnected by said metallic coating. The fact that the coating interconnects all of the lugs, prevents build-up of static electricity which might injure the electronic component. The electronic components can be easily tested by removing the top portion of the container and by inserting non-conductive inserts between the portion of the container to which the electronic components are secured and the electronic components. Test probes can then be brought into contact with the electronic components.

Abstract: A wave guide of an antenna feed assembly has a wave polarization rotary section comprising a plurality of closely spaced conductive pins extending across the diameter of the wave guide. A first group of such pins adjacent the output end of the wave guide to an amplifier are stationary while a second plurality of pins are rotatable about the axis of the feed in progressive steps through each pin to 45.degree. positions selectively to one or the other side of the plane formed by the stationary pins to rotate one or the other of the 90.degree. polarized waves 45.degree. into the plane of the stationary pins and thence to the amplifier. The movable pins are received in a collar rotated by a conventional motor, the pins being located in slots of varying lengths in the collar so that each rotatable pin lies at the same angle to both of its adjacent pins.

Abstract: A detector device is provided, in particular for detecting faulty needles or closed needle latches in a knitting machine with latch type needles, consisting of a non-electrically-conductive feeler which is normally resiliently urged into contact with the upper parts of the needle hooks, and an electrically-conductive probe which normally does not contact the needles but passes through the needle hook openings as relative movement of the needles past the detector takes place. However, if a needle latch is closed the probe makes contact with it and also if the needle hook is broken or bent the feeler is permitted to move laterally thereby enabling the probe to contact the faulty needle, contact of the probe with a needle completing an electrical circuit which signals a needle fault. For circular knitting machines in which the needles travel past the detector, the detector is associated with a controller that stops the machine when the faulty needle reaches a particular position in the needle travel path.

Abstract: The voltage at the high voltage terminal of a first particle accelerator is stabilized particularly during pulsed operation by producing a compensating current at its accelerator terminal such as to maintain the voltage of the terminal constant. The compensating current is produced by a second particle accelerator coupled between the accelerator terminal and a high voltage terminal connected with a high voltage DC power supply. The charged particle flow through the second particle accelerator is such that the charge on the accelerator terminal of the first accelerator remains substantially constant even though the voltage at the high voltage terminal drops during simultaneous pulsed operation of both particle accelerators.

Abstract: A sports wheel chair has elongated side frame members of hollow high strength tubing extending along the two sides of the chair to provide rear wheel and seat support and extending accurately downwardly to provide front wheel supports. The elongation provides a degree of flexibility that permits front end collisions without damage and permits flexure to maintain contact of all four wheels with uneven terrain. Elongation of the frame increases stability and concentrates weight on the rear wheels for greater maneuverability. The main wheels are cambered out from top to bottom to protect the hands and provide a wider wheel base. All of the frame members are hollow tubes to impart light weight to the chair along with great strength. The two elongated side frame members are joined by novel strong quick connecting and disconnecting parts at the front and back to permit rapid disassembly without sacrificing strength. The front connecting part also provides a foot rest.

Abstract: A protection circuit for multi-phase motors provides circuits for protecting a motor against low voltage, phase reversal or loss of a phase and other improper operating conditions on both the line side and the motor side of the main motor contactors. The line and motor side circuits are interrelated such that an unsafe condition on either side of the contactors causes the contactors to be opened. A time delay circuit on the motor side of the contactors prevents interruption of the holding circuit until conditions on the motor side of the contacts have been established and sensed for operation, proper or otherwise, during motor start up.

Abstract: A plate-type filter press has sidebars carried on fixed frames, and the filter press plates, the queen end and the king end are all supported on the sidebars by means of pins projecting laterally from the plates and the king and queen ends and resting on the bars. The plates and the queen end are able to slide along the bars on their pins, and even the king end is allowed a limited amount of float between stops on the bars. The press is opened and closed by means of double-acting hydraulic piston-and-cylinder units which are mounted on the king end and are coupled to the queen end by longitudinally extending tie rods so as to close the press by pulling the queen end towards the king end.

Abstract: A system for displaying two functions of two variables. In one form, for displaying range and intensity functions for active infrared radar images, the system maps range information into hues, and intensity information into different apparent brightness levels for each of the various hues and generates corresponding control signals for a color display.

Abstract: A plate type filter press, which is opened and closed by at least one hydraulic piston-and-cylinder unit, has a mechanical lock to lock the press in the closed position so that it is not necessary to maintain a high hydraulic pressure to keep the press closed. The mechanical lock may be a set of claws on the hydraulic cylinder to co-operate with a locking ring on the piston rod, with a hydraulic lock cylinder to retract the claws for unlocking, or a lock gate that is introduced into or retracted out of the path of a lock collar on the piston rod by operation of a lock cylinder. The press is first closed with a predetermined high hydraulic pressure that compresses the filter press pack sufficiently for easy movement of the mechanical lock into locking position, and then operation of a lock limit switch automatically stops the hydraulic pump and energizes a bleed valve to reduce the closing pressure to a level at which the press pack compression is relaxed enough to give firm lock engagement.

Abstract: Cross-linkable polyethylene blended with a copolymer of isobutylene and a conjugated diene is capable of being cross-linked, bonded, stretched and recovered without a significant loss of strength characteristics or seal.

Abstract: An arm for holding the impact stylus of a high speed dot matrix printer is fabricated from a single stamping which when properly folded defines two members having C-shaped cross-sections joined by a thin web. The web is folded around the stylus to bring the 4 legs of the two C-shaped members into overlapping relationship to define a hollow elongated and tapered arm having the stylus substantially wholey encircled by the web whereby after brazing the stylus is securely held.

Abstract: A wheeled hand-held exercise device for strengthening the muscles of one's midsection is provided. The device has at least two wheels mounted on an axle and has shafts connected to and extending both coaxial with and perpendicular to said axle.