Abstract: A method for preparing a polyurethane wherein the components thereof have a long shelf life. The formulation is made by separately preparing a prepolymer solution, a crosslinking solution, and a cement solution. Upon utilization, the solutions are mixed together and applied. The urethane has very good fuel resistance and can be used as a coating in fuel tanks as well as to form integral fuel tanks.

Abstract: A pair of axially aligned and nested pistons are mounted in a pressure sealed arrangement within the bore of a pressure housing. A primary piston is moved in response to increasing pressure to provide an actuating output force while a secondary piston simultaneously moves to overcome a reverse bias on it by a tension spring and adds to the actuating force by engaging the primary piston only when the pressure exceeds a specific higher threshold. The primary and secondary pistons thereafter operate in conjunction under the influence of high pressure to provide the output actuating force.

Abstract: A polyester polyurethane compound is formed by reacting trans-1,4-cyclohexanediisocyanate with a mixed polyester. The mixed polyester can be the copolymerization condensation product of an aliphatic dicarboxylic acid or an aromatic dicarboxylic acid, or a separate physical blend thereof reacted with a polyol. The polyurethane can also contain small amounts of non-extractable epoxies and carbodiimides. The urethane has very good hydrolytic stability in comparison with prior art polyurethane systems and also very good fuel resistance and anti-icing resistance. A preferred area of use is an aircraft fuel tanks and anti-icing components.

Abstract: A torque readout sensor for mounting to a bolted interconnection between an aircraft brake assembly and a brake reaction torque limiting apparatus to sense the reaction torque upon the application of braking action comprises a metal body that replaces a bushing at the bolted interconnection and configured such that a deflection of the body is accomplished in the direction of the reaction torque force and at least one pair of strain gauges are affixed to the body at the point of deflection to provide an output electrical signal calibrated to the amount of deflection and thus to the reaction torque experienced by the body.

Abstract: A method of making an elastomeric coated fabric container utilizing cured elastomeric coated fabric and adhering the edges of each layer of fabric to the other with an adhesive film and curing the adhesive film under heat and pressure to form said container.

Abstract: A high heat resistant transparency of epoxy resins cured with adducts of trimethoxyboroxine and benzyl alcohol is disclosed to resist intense heat for these transparencies in their use on military and industrial hardware. Additionally, the transparency may include phosphite or phosphate compounds to improve heat resistance, with the phosphate compound in sufficient concentrations to delay gel times such that the phenyl substituted alkyl alcohol may be eliminated from the composition. This transparency may exist in a composite with other layers of transparent material known to those skilled in the art. The epoxy tranparency layer is bound to the other transparent layers, in a variety of configurations, using an interlayer of mercaptan terminated resins. These resins greatly improve resistance to moisture permeability in and about the edges of the entire transparency.

Abstract: A high heat resistant transparency of epoxy resins cured with adducts of trimethoxyboroxine and benzyl alcohol is disclosed to resist intense heat for these transparencies in their use on military and industrial hardware. Additionally, the transparency may include phosphite or phosphate compounds to improve heat resistance, with the phosphate compound in sufficient concentrations to delay gel times such that the phenyl substituted alkyl alcohol may be eliminated from the composition. This transparency may exist in a composite with other layers of transparent material known to those skilled in the art. The epoxy transparency layer is bound to the other transparent layers, in a variety of configurations, using an interlayer of mercaptan terminated resins. These resins greatly improve resistance to moisture permeability in and about the edges of the entire transparency.

Abstract: A brake adjuster, including a pin interconnecting a brake pressure plate at one end and a metal swage at the opposite end and oriented within a deformable tube such as to radially deform the tube to the shape of the swage as the swage moves into the tube bore in response to brake wear, is rendered non-reversible to loading in the reverse direction by a washer mounted on the pin, relative to the swage, and having the circumferential geometric configuration of the tube bore such as to move easily within the bore in the swaging direction but stopped from movement in the opposite direction by the deformed portion of the tube. In alternative embodiments a tube is mounted on the pin or the pin diameter is increased to approximate the bore diameter of the deformable tube. The trailing edges of the tube or the pin adjacent the leading edge of the swage abut the deformed portion of the tube in the reverse direction to prevent motion in that direction.

Abstract: A flexible, fabric-reinforced, complex-shaped container comprises a fabric reinforcement material and at least one facing layer of a polymeric or elastomeric material, said fabric comprised of yarns capable of changing their effective lengths upon being shaped to a complex mold configuration and thereafter maintained in that shaped condition by curing of the composite material. The method of the invention comprises applying a differential pressure to the fabric reinforced composite in a concave mold having the desired complex configuration to move the composite into the mold cavities as the effective length of the yarns change to conform to the mold and thereafter curing of the composite so as to set the composite to the mold shape.

Abstract: A brake adjuster wherein a solid or fluted rod is connected between the return mechanism and the pressure plate of a brake assembly. The rod passes through a draw ring of slightly less diameter than the major diameter of the rod. The draw ring may be part and parcel of, or operatively connected to, the spring follower. The rod is drawn through the draw ring under force imparted by the pressure plate on brake wear action, the draw ring swaging and reshaping the rod as the rod extends to compensate for brake wear. The rod may be either a smooth, solid one, or it may be fluted or ribbed.

Abstract: A manufacturing process for reverse building complex-shaped vehicle fuel tanks using complementary female mold halves which, when joined together about their mating peripheral edges, exactly duplicate the vehicle body cavity into which the completed tanks are to be mounted. Plies of a urethane elastomer are spray-coated into the molds and nylon fabric reinforcement is applied in two steps to complete the composite which forms the tank structure. Upon completion of forming of the composite, the mold halves are joined and a splice is completed from the inside of the tank by laying in reinforcement fabric at the butt joined sections of the composite and sealing it with urethane elastomer.

Abstract: Apparatus for electrically controlling the application and release of aircraft brakes. In one embodiment, the invention includes a slurry clutch controlling a reciprocating member which is operatively connected to the pressure plate. In another embodiment of the invention, a torque motor is adapted to have an armature which comprises a ball screw, the ball screw being in engagement with a longitudinal drive rod interconnected with the pressure plate. Rotation of the armature causes the drive rod to move the pressure plate into forceful engagement with the brake disk stack or to retract the same. In yet another embodiment of the invention, a plurality of torque motors are interconnected with a bull gear which is operative for driving the pressure plate.

Abstract: An inflatable liner for mounting within a hopper type receptacle or container which receives and discharges flowable bulk particulate material. The liner is comprised of one or more inflatable members such as inflatable fabric bags or tubular members loosely supported by sling members at spaced locations along the interior surface of the walls of the container in such manner that each inflatable member is capable of limited miltidirectional movement with respect to the adjacent container wall and a flexible wear resistant cover sheet loosely covering the wall and the inflatable members. The slings may be attached to either the container wall or to the bottom side of the cover sheet. Alternate inflatable members are inflated and deflated in any desired sequence to cause the cover sheet to undulate and thereby set up a continuous cyclic wave motion which serves to maintain the continuous flow of particulate material through the container.

Abstract: A hydraulic actuator comprises a first piston mounted within a primary bore and moved in response to a low pressure force while a second piston is mounted in an axially aligned secondary bore and is moved in response to a high pressure force. The second piston engages the axially aligned first piston and both are moved under the influence of the high pressure while the first piston only is moved by the influence of the low pressure force. The piston areas are in proportion to each other as the separate pressure forces so as to provide a substantially equal output actuating force irrespective of the actuating pressure.

Abstract: A high heat resistant transparency of epoxy resins cured with adducts of trimethoxyboroxine and benzyl alcohol is disclosed to resist intense heat for these transparencies in their use on military and industrial hardware. This transparency may exist in a composite with other layers of transparent material known to those skilled in the art. The epoxy transparency layer is bound to the other transparent layers, in a variety of configurations, using an interlayer of mercaptan terminated resins. These resins greatly improve resistance to moisture permeability in and about the edges of the entire transparency.

Abstract: A high heat resistant transparency of epoxy resins cured with adducts of trimethoxyboroxine and benzyl alcohol is disclosed to resist intense heat for these transparencies in their use on military and industrial hardware. This transparency may exist in a composite with other layers of transparent material known to those skilled in the art. The epoxy transparency layer is bound to the other transparent layers, in a variety of configurations, using an interlayer of mercaptan terminated resins. These resins greatly improve resistance to moisture permeability in and about the edges of the entire transparency.

Abstract: A solid state switch for electro-explosive devices. Fundamentally, the switch includes a matrix of transformers, each having a center-tap primary winding and a grounded secondary winding, the secondary having a bridge wire connected thereacross. Power gating circuitry is provided for applying a DC voltage to the center-tap primary of all transformers in a selected row. A pair of transistors are connected through diodes to opposite ends of all of the primary windings of the transistors in each column. A driver alternately gates the pair of transistors of a selected column into and out of conduction such that the current through the primary of the transformer common to both the selected row and selected column is of alternating direction, inducing an AC current into the associated secondary winding. The bridge wire of the secondary is thus energized by an AC current.

Abstract: High temperature-resistant thermobarriers have a filler therein. The filler can be an opaque thermobarrier material, a fabric or cloth such that a laminated thermobarrier is formed, or preformed bubbles of glass, ceramic or plastic such that a syntactic foam thermobarrier is formed. The thermobarrier contains a boroxine compound therein as well as epoxy resins and various phosphorus compounds and/or aromatic alcohols. Generally, the syntactic foam thermobarriers give the best heat protection.

Abstract: Test circuitry for exercising and testing the operability of antiskid and automatic braking control circuits in an aircraft braking system. The invention includes a digital processor communicating with an interface circuit associated with each antiskid control circuit and the automatic braking system valve drivers. Each such interface circuit includes an analog switch receiving an electrical stimulus from the processor and applying the same to various test points in the associated antiskid control circuit or automatic braking system valve drivers. An analog selector is connected to various test points in the antiskid control circuits and automatic braking system valve drivers to sense the responses to the electrical stimulus and to pass such responses to the processor to determine the operability of the antiskid and automatic braking control systems.

Abstract: An inflatable-deflatable flexible structural component comprising a flexible foam core portion having a fabric covering, the fabric being sealed against loss of air by a flexible elastomeric coating.