Abstract: A reversible anti-backlash power transmission for selectively transmitting power in opposite directions without backlash in the gear train. The transmission includes interconnected first and second gear boxes. Each gear box includes a drive shaft having a worm associated with the drive shaft for rotation therewith, a worm gear in meshing engagement with the worm, a driven shaft associated with the worm gear for rotation therewith, and a pinion gear structurally associated with the drive shaft for rotation therewith. A rack gear is in meshing engagement with the pinion gear of each of the first and second gear boxes. An electro-magentic coupler interconnects the drive shafts of the gear boxes. The coupler allows the automatic angular displacement of the drive shafts of the two gear boxes relative to each other to eliminate gear backlash in any of the mating gears.

Abstract: An apparatus for manipulating a tool along a spiral path into a circular or orbital path includes a first shaft and a second shaft in end-to-end relationship. The apparatus includes a slide device interconnecting the adjacent ends of the first and second shafts for allowing the second shaft to move tranversely of and in a generally radial direction away from the first shaft as the first shaft rotates about its own longitudinal axis. The tool to be manipulated is attached to the distal end of the second shaft. As the first shaft rotates about its own longitudinal axis, the second shaft moves radially away from the first shaft so that the second shaft, and tool attached thereto, follow an initial spiral path leading into an orbital path centered on the longitudinal axis of the first shaft.

Abstract: An apparatus for dispending a fluid free of included air bubbles, such as for example, an adhesive bead, includes sensing devices for detecting the presence of an included air bubble in the conduit leading from a source of the fluid to a discharge of a movable fluid dispenser. The sensing devices are connected to a motor which drives an arm on which the fluid dispenser is mounted. A first sensing device slows movement of the dispenser upon sensing an air bubble in the fluid and a second sensing device stops movement of the dispenser upon sensing an air bubble in the fluid. The movement of the dispenser is restarted after a predetermined time period sufficient to allow the air bubble to pass out of the dispenser discharge. The sensing devices advantageously use a light beam, such as infra-red light or laser, to detect the presence of the included air bubble.

Abstract: A pressure developing and balancing circuit for use with chopped glass fibers in reaction injection molding eliminating high pressure drop valving of glass filled liquid component materials which normally create serious heating and valve erosion wear problems.

Abstract: An electromagnetic medical applicator for tissue-heating comprises a single resonant element (1) in contact with one surface of a layer of material (5) whose opposite surface faces the body of a patient (6). The material has a wave-impedance which approximately matches that of the human body and a dielectric constant not less than for a material having unity magnetic permeability which produces this match. In one form the element is a patch resonator (1) on a substrate (2) backed by a ground-plane (3) and overlaid by the layer (5); at least the substrate may include both dielectric and magnetic material in order to combine a desired resonator size-reduction and wave-impedance. In another form a needle-type applicator is coated with the layer of material.

Abstract: An electromagnetic medical applicator for heating tissue comprises a patch resonator (1) on a substrate (4) of dielectric material backed by a ground-plane (3), and having a layer (7) of dielectric material overlying the resonator inter alia to effect impedance-matching to tissue, in which the substrate includes a volume of magnetic material (5) adjacent the maximum-current region of the resonator in order to reduce the length of the resonator at its resonant frequency.

Abstract: The arrangement is for cancelling unwanted sidelobes in travelling-wave arrays, especially the back lobe where the main beam approaches the end-fire direction; the array should have high symmetry, i.e., with the usual form of array (radiators spaced along a single feeder), the radiation patterns when fed from either end should be mirror images. Cancellation is obtained by having feed connections (2,2') at both ends of this form of array (1), the feed at one end being attenuated (8) relative to the other and effectively subtracted (6) therefrom. In RF form, for receiving or transmitting, the subtraction can be effected by phase-reversing (7) the signal in one of the feed connections. In baseband form, suitable for receiving only, diodes are included in both feed connections and subtraction performed at baseband frequency.

Abstract: An antenna array comprises a dielectric image waveguide (3) acting as a feeder, which may be of the insular or inverted-strip type, in contact with a dielectric sheet (1). On the sheet (1) is located a plurality of strips (4) of metallizing extending outwards from the feeder-guide (3). The inner ends of the strips are located to couple with the feeder-guide and their outer ends act to radiate or receive most of the power. Preferably the mode propagated in the feeder-guide is an E.sub.mn.sup.y mode higher than the fundamental, suitably the E.sub.21.sup.y mode.

Abstract: An adjustable slotted orifice assembly for controlling the feed rate and dispersion pattern of high pressure impinging liquid reaction injection molding materials. In a preferred embodiment vibration of the variable orifice, opening particularly useful with low through puts, provides improved results.

Abstract: The invention relates to compact radio antennae structures having wide bandwidth characteristics, the antennae structure including a plurality of end-fed antennae, and a terminal connected to end feed the antennae, wherein each of the antennae comprise a pair of extended conductors disposed in helical insulated windings of the same diameter and opposite chirality, the windings being coaxially, longitudinally coextensive and connected together at one end to form said end-feed, and wherein the antennae are each of different electrical lengths.

Abstract: Dispensing apparatus with a pain of fluid dispensing cylinders each having a piston driven through a separate differential transmission with two inputs. One of the inputs of both transmissions is driven by a first electric motor. The other inputs are connected to counterrotating output shafts of a gear box driven by a variable speed second electric motor to introduce unlike inputs into the differential transmissions so that the ratio of fluid dispensed by the cylinders is varied by operation of the second motor in different directions and at different speeds. During the return stroke of the pistons the second motor is operated at a rate higher than its rate during the dispensing stroke so that any difference in the length of the dispensing stroke of the pistons is reduced to zero before the pistons home, whereupon the second motor is de-actuated and the first motor alone homes the pistons to prevent the pistons from getting out of phase.

Abstract: In the manufacture of foamed plastic slab by introducing foamable fluid from a mixing head into a moving conveyor-type mold, the improvement wherein supplemental quantities of the fluid are conducted from the mixing head longitudinally to locations where the main body of the material has foamed to partly expanded condition and friction between the sides of the mold and expanding material has caused the upper longitudinal side edges of the expanding material to assume a rounded shape which curves away from the mold sides leaving a space. The supplemental material is introduced into the spaces while the mold moves and upon expansion substantially fills the spaces and thereby greatly reduces the amount of the slab which must be cropped off prior to cutting it to form saleable articles.

Abstract: This invention relates to radio antennae, and in particular to dielectric-clad antennae of the kind comprising a length of conductor the electrical length of which is effectively increased by a cladding of dielectric material. The disclosure describes how the physical height of an antenna, typically an HF or VHF wire monopole antenna can be reduced in relation to its electrical length by means of a thin cladding of dielectric material having a relative magnetic permeability substantially greater than unity, e.g. ferrite. By selecting a material having a relative magnetic permeability substantially greater than its relative dielectric permittivity, a given reduction in antenna height can be achieved with a much thinner cladding than can be achieved using conventional materials.

Abstract: A travelling wave stripline antenna array adapted for use as a frequency-swept antenna, comprising a pattern of conducting material on an insulating substrate with a conducting backing, the pattern comprising a feeder strip and a plurality or radiating antenna elements each in the form of a strip attached to and extending tranversely away from the feeder strip, and having an open circuit termination at its free end. At least some, and preferably all, of the strips are formed with a longitudinal slot extending from the opposite side of the feeder strip and terminating before the open circuit end of the strip, so that each slotted strip behaves as a phase shifter as well as a resonant radiating antenna element.

Abstract: Reactive fluids are furnished from separate tanks continuously to a mixing head. The resulting mixture flows continuously through an outlet having a valve which directs the flow to one or another of a plurality of dispensing nozzles. Molds are moved synchronously and in some cases continually beneath the nozzles through which the mixture is dispensed.

Abstract: Fluids to be mixed and dispensed are metered out of hydraulic cylinders by movement of pistons therein. The rate of movement is controlled by movement of a recirculating ball nut connected to each piston rod, movement of the nut, in turn, being controlled by the rate of rotation of its ball screw. Each screw carries a gear, and the gears have a common drive so that the ratio of the diameter of the gears accurately controls the volumetric metering ratio of the cylinders. In one form, an inert fluid under pressure acting on the reverse sides of the pistons assists the force of the ball nut drive. In another form, two cylinders work as a pair on each fluid, inert fluid under high pressure acting on the reverse sides of the pistons of each pair to meter, mix and dispense the fluids at about two thousand to two thousand five hundred pounds per square inch.