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: A unique configuration for a torque tube assembly associated with a disk type brake comprises separable and replaceable keys and a separable and replaceable brake disk backplate. The keys are mounted in anti-rotation slots at the inboard and outboard ends of the torque tube and bolted to the barrel portion of the torque tube and are characterized by a radial extension that supports the separable backplate. The torque tube is a formed wrought metal tube that is mounted to the stationary portion of the brake housing via bolts that thread into the inboard end of the keys. In this configuration, the occurrence of a defective key and/or backplate does not require replacement of the total torque tube assembly.

Abstract: A process for providing a low haze, high transparent, high heat-resistant laminate by forming a preform laminate of a high heat-resistant layer covered on both surfaces by a non-glass protective layer with at least one said layer being an as-cast acrylic layer. This combination can be readily stored for long periods of time or used immediately after the formation thereof by peeling off one of the as-cast acrylic layers and applying a transparent flexible adhesive layer thereto. The transparent material can be added to the adhesive layer. Many other combinations and laminates can be formed from the preform high heat-resistant laminate since during the preparation thereof, haze is not introduced to the transparency via moisture, and contact with haze-forming release coatings is avoided.

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: A resilient liner for mounting within a hopper type receptacle which receives and discharges flowable bulk particulate material. The liner is comprised of one or more resilient panels each having a fluid tight envelope with a top and bottom sheet held in substantially spaced parallel relationship by a series of internal transverse seams or walls or by a layer of open celled foam when the internal pressure of the envelope is at least slightly higher than the ambient pressure outside the envelope. The panels are sufficiently resilient, that particles or chunks of material passing through the hopper striking the top of the envelope cause undulation of the top of the envelope which aids in maintaining the constant flow of particulate material through the receptacle. The panels may be protected by a wear resistant cover loosely covering the panels or integral with the panels.

Abstract: A pneumatic pad comprises reinforcement fabrics of parallel cords pre-formed to a specific radius through the edges of the pad and press-molded to a very flat pre-pressurized configuration. At least two orthogonally oriented reinforcement fabrics are embedded in elastomer and have lapped ends positioned in opposite covers of the pad such that each cover comprises at least three cord reinforcement plies two of which are oriented orthogonally with respect to the other.

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: 1. In a terrain contour mapping system in an aircraft, the combination ofa dipole radar antenna consisting of two vertically spaced fan beam antenna poles mounted on the aircraft,means to transmit radar signals at a depressed angle from the antenna in directions normal to the flight path of the aircraft,means to measure and record the phase difference in the radar signals received at the two poles of the antenna when the signals are reflected from the earth,an inertial system to measure and record airborne platform orientation and position,means to combine the orientation and position information with the recorded radar information, andground stationed means adapted to receive the combined information to provide a three coordinate output signal which determines points on a map representing the contour of the terrain flown over by the aircraft.

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 friction pad configuration and a method and apparatus for fastening said pads to a disk core member wherein the base of the pad is formed with a plurality of extended tabs that are inserted in slots in the core and secured to the tabs of a pad on the opposite surface of the core by a clip that draws the base-to-base mounted pads together on the core. Alternatively, and for mounting on a single face surface of the core, U-clips are mounted on the tabs and inserted through the core to the opposite surface thereof and the ends of the U-clips are bent down into annular grooves in the face surface of the core to securely mount the pads to the core.

Abstract: A coating for optical members such as acrylic or polycarbonate comprising prehydrozyled alkyl silicate, polysilicic acid and monocarboxylic acid dispersed in an aqueous vinyl interpolymer and an epoxy binder containing a filler of fumed silica or aluminum oxide and a silane.

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 chemically resistant coated fabric laminate in which a rubber layer is adhered to one side of a fabric which has been dipped in a blend solution of a rubber and an adhesive. To the remaining side of the impregnated fabric is applied a rubber layer which has thereon a chemically resistant preformed film. The rubber layer containing the preformed film has a dry adhesive compound incorporated therein.

Abstract: An antiskid control system is presented which includes variable gains to compensate for brakes which exhibit large changes in lining friction coefficient. Fundamentally, the invention includes a pressure transducer and associated amplifier which presents an output signal corresponding to brake pressure. An accelerometer is connected to a second amplifier which presents an output signal analogous to brake torque. These two signals are combined in a summing circuit and the function obtained therefrom is used to modify the control signal from the antiskid control circuit. Effectively, this function provides a modification of antiskid system gain.

Abstract: An antiskid brake control wherein sensitive deceleration detectors present output signals to a valve driver for releasing brake pressure. The deceleration detector output is also passed to a modulator which acts as a memory circuit to keep the average brake pressure near the skid level and also provides for a controlled reapplication of brake pressure following the release. A constant current discharge circuit is connected to the modulator to provide a linear discharge of the modulator capacitor. A fast recovery circuit is interconnected between the deceleration detector and modulator to rapidly discharge the modulator capacitor in the event that no outputs from the deceleration detector have been sensed for a predetermined period of time. The control system includes gain control circuitry to provide for at least three distinct system gains.