Abstract: A circuit board testing apparatus is disclosed which effectively provides two vacuum chambers. A plurality of test probes casings are mounted in a bottom wall, which casings extend upwardly through an intermediate plate, the casings being slidably sealed to the plate. A top wall which has a plurality of apertures therethrough is provided in normal spaced relationship to the intermediate plate, and gasketing means are provided to achieve a vacuum chamber between the top plate and the intermediate plate and between the intermediate plate and the bottom wall by arranging a flexible diaphragm. Vacuum is supplied to the two chambers in a selected sequence for moving the top wall toward the intermediate plate, second vacuum means provided for moving the top wall and intermediate plate toward the bottom wall. By providing probe tips of different lengths in the receptacles, a variety of combinations of circuit testing can be performed, including a functional test in one operation.

Abstract: An apparatus for manufacturing wafers is disclosed that includes a pair of rolls each containing cavities that form the wafers. The cavities each have outer edge walls that extend from the bottom portion of the cavity at an obtuse angle and the two rolls are arranged so that the cavities become effectively mirror images of each other as they engage at the nip. The cavities also have portions rising from the bottom thereof that impress a design substantially equal from both sides to proclude warping of the bread.

Abstract: A method and apparatus for hanking cords including a pair of jaws for supporting the cord in an elongated position. The jaws being activated to move the cord to a winding turntable that has two upstanding posts. A latching device located at a post of the turntable grips the cord and allows the post to return to its initial position so that the cord may be wound and hanked.

Abstract: A tennis ball recovery system for use in a full court utilizes an inelastic flexible damping screen hooked onto the back fence of the tennis court, which intercepts the driven ball and drops it onto a resilient apron that extends away from a collection trough. Within the trough there is located a conveyor that will move the balls toward the center of the trough and substantially central of the trough a conduit is provided with positive pressure to move the ball into a conduit and into a receptacle.

Abstract: An improved cork extractor is disclosed which has a corkscrew secured to a body member in a pivoting relationship thereto, with a fulcrum member pivoted to one end of the body member to co-act with the corkscrew. The fulcrum member is also provided with a knife portion for cutting the seals about bottle tops, and a cover is slidably arranged on the body member to cover the corkscrew when the same is pivoted into parallel relationship with the body member to make a convenient case for the cork extractor.

Abstract: A temperature controlled circuit including a thermistor located in one branch of a bridge circuit containing several resistors, an operational amplifier, all combined in such a manner that a resistor is inserted in parallel with the thermistor to lower its impedance. The branches of the bridge circuit are also arranged in such a way that three branches have a nominal resistance approximately equal to the resistance of the thermistor in parallel with its fixed resistance at room temperature, while the fourth leg on the branch in series with the parallel thermistor and resistance across the voltage source will have a resistance nominally in the range of one-third of the paralleled resistor and thermistor. The arrangement is such that most any thermistor can be utilized merely by changing its parallel resistance, and the operational amplifier will operate with the thermistor over a wide temperature range.

Abstract: A clutch is disclosed consisting of two parts, the first part being a tubular shell closed at one end, the shell having therein a resilient female clutch member that is held in position by lips on the open end of the shell. A male member is provided which is adapted to be received within the resilient member. The resilient member within the shell is cylindrical of a longitudinal dimension less than the space within the shell and of an outside diameter less than the inside diameter of the shell. The male member is made of a size so that the sum of its diameter plus the wall thickness of the resilient clutch member is greater than the inside diameter of the tubular shell, so as to create an airtight joint when the male member is inserted within the resilient member, but yet permitting air to escape around the outside of the resilient member and retarded ony when disengagement is attempted, at which time the resilient clutch member will seal against the lip of the tubular shell.

Abstract: A jack stand attachment for use with a conventional support stand is disclosed, the attachment having a socket means that is slidably received on the load rest of the support stand. On the upper surface of the socket means, there is found a V-shaped rest and link means are pivoted to the attachment which have apertures therein near the terminus thereof that will accept a wheel lug bolt.

Abstract: A replaceable light source assembly is particularly designed for use in a projector housing with sources such as an HMI arc lamp or tungsten halogen lamp where the light source is contained within an envelope. Basically, the light source is closely spaced to a substantially flat mirror which images the light source around the source to produce the effect of a multiplicity of sources. In effect, the light source and its mirror image produces a beam pattern which may be projected towards a suitable projection lens, the light source and mirror are fastened to a heat sink structure to dissipate heat, and the assembly has suitable electrical connections to fit existing housings.

Abstract: This invention relates to a jewelry clasp which has a generally tubular body into which is received a catch. The catch consists of a doubled-over strip of spring metal which has central longitudinal portions thereof struck outwardly to provide a bearing surface so that the catch can be more readily inserted into the tubular body. To retain the two parts together, the tubular body has at an open end thereof, an inturned lip while one of the legs of the catch is provided with retaining means in the form of notches that engage the lip on the body.

Abstract: A device for storing and carrying an inflatable pontoon boat on a yacht features upwardly opening hooks that engage a pontoon so that the boat may rest against the stern of a yacht. The hooks are supported on a post swivably attached to a stern pulpit. The boat may be hoisted upwardly using a line attached to one pontoon and then into the hooks in which position the boat is fastened in place with line.

Abstract: An improved method for the manufacture of purified esters is provided. The method comprises reaction of carboxylic acids or anhydrides with alcohols in the presence of certain novel chelated titanate catalysts having unique structural features that provide means for simplification of the refining process as well as for improving reaction rates, ester yield and product quality.

Abstract: A hydrodynamic bearing is disclosed which is designed to work in a fluid. The hydrodynamic bearing is formed with a central section of the load carrying surface that is more compliant so that it will deflect under load and form a pressure pocket of fluid to carry high loads.

Abstract: A fluid bearing is disclosed which consists essentially of a number of bearing pads, each having a face member and a support member that are separated and bonded together by an elastomeric material. The face member will have a load engaging surface, and its back surface will have at least one arcuate portion to provide a point of inflection which opposes an identical arcuate surface providing another point of inflection located on the support member. In operation the pad which operates in a fluid that serves as a lubricant will develop friction and pressure forces, which move the pad in such a way as to provide a wedge for hydrodynamic lubrication.

Abstract: A game of chance apparatus includes a rotatable symbol substrate driven relative to a marker by an electric motor. Teeth are mounted coaxially with the symbol substrate and have a tooth repetition equal to that of the symbols. The relative motion between the symbol substrate and the marker can be started or stopped by an electromagnet, the marker and the symbol substrate being lockable into predetermined relative positions by means of the teeth. To reduce operational energy consumption and impact stresses, two annular electromagnets are mounted concentrically to each other and coaxially with the shaft of the symbol substrate. The magnetizable marker is freely displaceable between the poles of the electromagnets. Rings which cannot be magnetized are mounted at a distance from each of the electromagnets between their poles and the associated ends of the marker.

Abstract: A collapsible tripod stand for an easel is disclosed which has three legs of channel cross section with one end of each of the legs having outwardly extending wing portions which are loosely fastened to each other by fastening means, the wing portions being bent at an angle so that when the legs assume a pyramidal form, the wing portions will assume face-to-face contact. Compression spring means between the ends of the fasteners and the face of the wings urge the legs to assume pyramidal form.

Abstract: An improved control for a spinnaker pole is disclosed where the pole is releasably held in a sleeve on a rotatable support that has pole control line for laterally sliding the pole relative to the support, clew lines for drawing the clew out to the ends of the pole as well as pole direction changing lines.

Abstract: A method of removing salts of the alkali earth metal group from water is provided wherein water is supplied at a controlled flow to a pair of serially connected five-micron prefilters which remove contaminants and reduce the flow rate. The effluent is then passed through at least twelve parallel connected activated charcoal filter units where the flow is reduced to approximately 0.5 g.p.m. allowing additional time for the alkali salt to be adsorbed in the charcoal.

Abstract: This invention is concerned with a method and apparatus for measuring the electro-kinetic properties of a liquid which may be a mixture such as a slurry of particles, or a dispersion of droplets. Electrodes are placed in the liquid and an apparatus is provided for applying an alternating electrical potential to these electrodes. The electric field from this alternating potential acts upon the charged elements in the liquid, resulting in the generation of sound at the frequency of the applied electrical potential. By placing a conventional acoustic transducer in a spaced relationship to the electrodes, the acoustic signal is detected and measured. The amplitude of the acoustical signal will be a function of the electro-kinetic properties of the particles or emulsion droplets in the liquid. In its preferred form, the electrodes that are placed in the liquid have a spacial separation of one-half wave length, or odd integer multiples of half wave length of the sound which they generate.

Abstract: An electrical apparatus that is adapted to be connected between a source of alternating current supply and a load is designed to achieve automatic correction of hot and neutral lines at the output should the supply lines at the input be reversed, and is arranged to be utilized in connection with a ground wire. To achieve the result, a change-over switch is provided in each of the phase wires and a logic circuit is provided for operating the switch, the logic circuit being arranged to detect a voltage change between one of the phase wires and the ground wire so that when a voltage change is detected, the logic circuit will energize the switch to reverse the connection of the supply lines to the load. Two types of change-over switches are disclosed, one in the form of a relay and the other in the form of solid state triacs.