Abstract: A VOR/ILS antenna system for rotor aircraft eliminates rotor modulation of signals without varying rotor speed. The system comprises one or more loop antennas each having one or more closed loop windings mounted on the aircraft in a generally horizontal plane and having a conductive shield covering the windings and dielectrically separated therefrom and having a small gap breaking the continuity thereof. A dual loop VOR/ILS system for helicopters is particularly disclosed wherein the pair of loop antennas are mounted in a horizontal plane on opposite sides of the central vertical helicopter mast extending upwardly between a pair of cowling members in which the antennas are disposed. Each antenna has a gap in the shield facing inboard and a connection point for the windings opposite the gap and outboard.

Abstract: An improvement in a servovalve employing spool-valve-position feedback provided by a feedback spring, wherein the feedback spring centerline is not aligned vertically with the center line of the spool valve, comprising a receiving hole in the spool valve body and a slot in the spool for feedback spring clearance; a pin or ball rigidly attached to the feedback spring with the portions of the pin or the ball which contact the sides of the receiving hole fitting in face to face relation to the inner surface of recesses formed in the slot by the hole.

Abstract: In a forming press, toggle-type punch stripper actuation mechanism for mechanically driving the punch shoe in a direction to strip the workpiece from the punch as a function of the relative movements of the punch and stripper sleeve.

Abstract: A gas meter riser for conducting gas from an underground source of supply, such as a gas main, to a point of delivery above ground level, such as a meter or the like. The gas riser comprises a substantially totally plastic gas conduit formed by plastic tubing secured at one of its ends to an underground plastic service line. The tubing is surrounded by a protective and supporting metal pipe casing which extends partially above ground level and partially below ground level. The metal pipe casing, its lower end adapted to be disposed below ground level, is moisture sealed about the plastic tubing. The upper ends of the plastic tubing and metal pipe casing are adjacent and structurally secured to each other in sealed fashion by a plastic transition adapter and a cooperating metal fitting. The adapter, at its lower end, is secured to the upper end of the plastic tubing, and, at its periphery, sealingly engages the metal fitting which, in turn, is secured to the upper end of the metal pipe casing.

Abstract: A positive displacement gas meter includes a two-piece composite center casting. The first piece is a center chamber casting which has a lower cylindrical wall partially defining the center chamber and an upper manifold portion defining passages to front and rear chambers defined by diaphragms and front and rear covers secured to the center chamber casting. The second piece comprises a valve chamber manifold casting which mounts to the top of the center chamber casting and defines openings registering with the openings to the front and rear chambers. The valve chamber manifold also partially defines a center chamber and defines an opening thereto, and further at least partially defines an exhaust passage having a collection end adjacent the openings to the chambers and leading to an outlet end. A valve seat having a sliding valve cover is mounted to the valve chamber manifold casting, and a top casting fits thereover and is secured to the valve chamber manifold casting.

Abstract: A slide fastener is disclosed in which a plurality of thermoplastic coupling elements are each individually secured to ribs on a pair of mounting tapes. A raised attachment boss is formed on the interior of the leg portions of each coupling element with the attachment bosses each being ultrasonically fused to the ribs on the mounting tapes.

Abstract: A low cost slide fastener stringer is disclosed as including a tape formed from layers of diverse non-fabric synthetic polymer materials, with a row of coupling elements attached along a folded edge of the tape.

Abstract: Aqueous dispersions of polyurethane polymers in ammonium salt form are prepared by reacting diisocyanates with a polyhydroxy, carboxylic acid to form an isocyanate-terminated prepolymer that is united with an unsaturated fatty acid ester polyol to provide carboxylic-containing, water-dispersible polyurethanes having properties exhibited by organic solvent-based, oil-modified polyurethanes. The aqueous dispersions can be formed by neutralization of "oil-modified," carboxylic group-containing, water-dispersible polyurethanes with ammonium salt-forming materials such as ammonia and amines. The aqueous dispersions are especially desirable coating compositions.

Abstract: A helicopter main rotor blade comprised of roll formed structure is provided. A C-shaped nose spar, a closure channel, a protective strip and a nose block are all roll formed. The nose spar extends the length of the leading edge of the helicopter blade, and is open to the rear between upper and lower trailing edge skins. The nose spar is flared adjacent the root whereby the trailing edges of the nose spar diverge from the leading edge as the nose spar extends toward the blade root. The closure channel is attached to the inside surfaces of the upper and lower trailing edges of the nose spar. The closure channel diverges from the leading edge as it extends toward said root. The protective strip is secured to a lead portion of the nose spar to capture a nose block against the leading edge of the nose spar.

Abstract: An above-rotor mount (30) for a helicopter (10) comprises an upper plate (32) coupled to a lower plate (34) by means of links (42, 44, 46 and 48). The lower plate (34) is connected to a rotating rotor shaft (16) and a non-rotating stand pipe (40) extending inside the rotor shaft. The links (42, 44, 46 and 48) are focused to control the mode shapes and dynamic response of the mounted components at a preselected frequency, such as the predominant rotor harmonic. Springs (50, 52) are connected between the plates (32, 34) for damping.

Abstract: There is disclosed a structural joint comprising a workpiece in the form of a section of sheet material and a fastener assembly, wherein the components of said joint are constructed to retain the fastener assembly in mounted relation with respect to the sheet material and confine the fastener against rotation upon the attachment of an additional fastener component thereto. The section of sheet material includes an aperture having a multi-lobular periphery. The fastener assembly includes a head portion and a shank portion extending axially therefrom. The head portion has an end cap section which is of a greater dimension than the sheet material aperture, and an intermediate section extending axially from the cap section and having a multi-lobular peripheral dimension to be received in the multi-lobular aperture formed in the section of sheet material.

Abstract: A helicopter having a mast 50 which drives a rotor and which is driven from a transmission 16 has a swashplate 10 individually linked to pitch horns on each rotor blade. At least four control channels 11-15 are coupled to the swashplate. Three channels may control the attitude and position of the swashplate. The control channels 11-15 are actuated in response to pilot commands transmitted by means including mechanical, optical or electrical systems. A separate power unit 21-25, 31-35 supplies each control channel. Each power unit is directly driven by the transmission 16. Means 11c-15c applies control of the swashplate 10 from among the control channels 11-15.

Abstract: Slide fastener elements, mounted on a longitudinal support member woven in the edge of a tape, are removed by cutting the longitudinal support member on each side of each fastener element and pulling the tape longitudinally between opposed biased blades engaging the elements to strip the fastening elements from the tape.

Abstract: A mechanism for use in a multi-station crank press, and the method of operating said mechanism wherein the stripper sleeves at each station are actuated, adjustably, under the control of two cams both to hold the blanks before they are contacted by the punches and to strip the blanks from the punches at selected moment as they are retracting.

Abstract: An apparatus for sewing a slide fastener chain to a pair of article panels separates the chain into separate stringers which are sewn to the article panels with the fastening elements facing outward. The slide fastener stringers are twisted and the inner edges of the attached article panels are folded and the stringers are reinterlocked by a turning and pull-up device through which the slide fastener stringers with attached article panels are pulled by a pulling mechanism.

Abstract: The present disclosure provides an integrant drive member for converting oscillating to reciprocating motion in a hand-held implement of the type having an elongate housing with an axially oscillable cap and a longitudinally reciprocal unit. The drive member comprises a pair of coaxial sleeve sections connected by a pair of links. One sleeve section is oscillable conjointly with the cap and the other is reciprocal conjointly with the unit. The links are pivoted at points defined by thin flexible webs formed at generally diametrically opposed positions on contiguous surfaces of the sleeve sections. Upon conjoint oscillation of the cap and the one sleeve section, the links swivel on the webs around the pivot points between folded and erect positions and reciprocate the other sleeve section and unit conjointly between retracted and extended positions.

Abstract: The invention contemplates an improved mechanical traction drive with a hydraulically implemented single control whereby a desired range of speed ratios between input and output shafts is selectively available, without requiring clutch connection to the power source, such as a battery-operated electric motor. The transmission employs a combination of completely mechanical friction-roller and meshing-gear planetary systems which are connected at all times, whether the single control is operated to call for a forward drive or a stop, and whether the motor is run in the direction to produce a forward or a reverse drive of the output shaft. Provision is made for automatically downshifting and upshifting the transmission via hydraulic means, in response to input-torque requirements and/or output-torque limitations.

Abstract: A helicopter landing gear assembly includes a pair of crosstubes (20, 22) having a pair of struts (28, 30) connected at the outboard ends thereof. A first of the crosstubes (22) is connected to the helicopter fuselage (16) at a pair of laterally spaced points (24, 26). The second of the crosstubes (20) is joined by a pivot connection (32) to a structural bridge (10) positioned above the second crosstube. The structural bridge (10) is connected at its outer ends to the fuselage main beams (12, 14). The structural bridge (10) connected to the second crosstube (20) permits the helicopter fuselage (16) to pivot about a fore-aft axis thereof to lower the natural roll frequency of the helicopter airframe and therefore increase the margin of stability to prevent ground resonance.

Abstract: There is disclosed an improved fastener and driver assembly which assures sufficient depth of engagement between the drive socket of the fastener and the working portion of the driver bit to provide efficient torque transfer from the driver to the fastener. The assembly includes a fastener having a recessed drive socket which is multi-lobular in cross-section, having an inner surface formed by alternating and smoothly joined flutes and lobes. The assembly also includes a driver for imparting rotational torque to the fastener which includes a head portion having a tip end and a center axis. The head portion of the driver is correspondingly multi-lobular in cross-section. The flutes are formed generally parallel to the center axis of the driver while the lobes of the head portion are tapered axially, converging toward the tip end of the head portion.

Abstract: Aqueous dispersions of oil-modified, carboxyl-containing, urethane polymers are prepared by reacting diisocyanates or their isocyanate-terminated prepolymers, with half-esters of hindered diols, especially 2,2,4-trimethyl-1,3-pentanediol, and anhydrides of polycarboxylic acids, preferably aromatic acids having at least three carboxylic groups, especially trimellitic anhydride. The urethane polymers are "oil-modified", i.e., extended with unsaturated fatty acid esterpolyols; and when neutralized with ammonia or amines can be dispersed in water to form especially desirable coating compositions. An organic phosphite may be incorporated in the compositions to control the development of hardness in films made from the aqueous dispersions and thereby avoid the formation of wrinkles in films that are made from the compositions.