Abstract: A fluid filled resilient bushing assembly for rotary vibratory motion control, particularly adapted for use in a joint between a motion inducing member and a base member, having an elongate outer rigid sleeve member, an elongate inner rigid member rotatable with respect to the outer rigid sleeve member and a resilient means interposed between the inner and outer members. The resilient means defines at least two spaced chambers interconnected by an elongate restricted passageway filled with incompressible fluid. The bushing assembly further has a pressure differential inducing means creating a differential in the fluid pressure of the chambers due to the rotary motion of the inner rigid member to permit contraction of one of the chambers, expansion of the second chamber and fluid flow therebetween providing damping of the rotary vibratory motion.

Abstract: A composite elongate shaft member useful in transmitting torque between axially spaced couplings rotatable about axes that may be misaligned. The member includes a series of bags of overlapped anisotropic layers each comprising parallel filaments bonded together in a matrix. The filaments in each layer pair are disposed at a predetermined lay angle with respect to the longitudinal axis of the shaft member with the lay angles in adjacent layers of each pair being substantially equal in magnitude but opposite in direction. A desirable ratio of torsional stiffness to bending stiffness is provided while minimizing bending stresses in the member by disposing the filaments at a predetermined angle which is selected in relation to the stiffness of the matrix material to cause the strain in the circumferential direction of the member to be substantially equal to the strain in the radial direction when the member is subjected to axial strain.

Abstract: A rail fastener having a rail support plate coated with electrical resistant elastomeric material to protect against electrical current leakage from the rail through the rail support plate is described. The only part of the support plate not coated with the electrical resistant elastomeric material are the serrations of the support plate. The coating of the support plate protects against current leakage from the rail to the support system.

Abstract: A method and apparatus for determining crack growth in an elastomer. A horizontally elongate elastomeric test specimen is cyclically stretched crosswise by upper and lower rigid plates contiguously attached to the long edges on both sides. The lengthwise growth of a crack induced by a small cut at one vertical edge of the specimen is determined by measuring the stretching force at each end. The lower plate is reciprocated by a hydraulic actuator relative to the upper plate. Two load cells measure the forces at each end of the specimen. With the use of a computer program and the relative forces measured by the load cells, the crack growth can be calculated.

Abstract: A fluid filled resilient bushing assembly for vibration control, particularly adapted for use in supporting a torque strut or an automobile suspension system, which comprises an elongate inner rigid member and a elongate outer rigid sleeve member, an impact absorbing member interposed between the inner member and outer sleeve member filling the annular space therebetween and a resilient end wall means interconnecting and sealing said inner member and outer member. The impact absorbing member together with the inner and outer members are resilient wall means defines two spaced fluid chambers and two restricted passageways connecting said fluid chambers. The chambers and passageways contain an incompressible fluid. Disposed within at least one restricted passageway is a flow control means for controlling the resistance to flow of the fluid between the chambers.

Abstract: A fluid mount particularly suited for mounting an engine in an aircraft. The mount includes a frame which is fastened to the engine and a support movably mounted in the frame and adapted to receive a wing pylon stub shaft. Opposed liquid-filled chambers are provided on opposite sides of the stub shaft support and are fluidly interconnected by an elongate tube. An auxiliary chamber is provided on the frame adjacent to the upper liquid chamber and is divided internally into a gas-filled portion and a liquid-filled portion which is in communication with the upper liquid chamber via an orifice. The auxiliary chamber accommodates changes in liquid volume without adversely affecting either the static or dynamic performance of the mount.

Abstract: A coating composition comprises 5 to 30 wt % of a blocked isocyanate-functional urethane prepolymer, 2 to 25 wt % of at least one organic solvent-soluble phenolic resin, 3 to 18 wt % of a halogenated resin selected from the group consisting of halogenated rubber, halogenated polyolefins and halogenated vinyl halide polymers and an inert solvent in an amount sufficient to provide an adhesive primer having a solids content of 10 to 70 wt %.

Abstract: The mount has variable volume fluid chambers interconnected by fluid passageways and containing electrorheological fluid. Valves are arranged in series with a plurality of the passageways. Each valve has a flow area greater than that of the passageway in series therewith. Energization of a valve generates an electrical field effective to so increase the apparent viscosity of the fluid within the valve as to prevent fluid flow through the passageway in series with it. Selective energization of the valves, by suitable controls associated therewith, varies the frequencies at which fluid inertia forces cause the mount to undergo abrupt changes in dynamic stiffness. The valves may be located upon opposite sides of a central mount section through which the chamber connecting passages extend. Electrode elements of the valves are preferably so shaped as to minimize fluid drag and electrical concentration.

Abstract: This invention relates to spring block elements of the type comprising layers of rubber affixed to end and intermediate plates, and according to this invention the layers of rubber are uniformly tapered in one direction to reduce buckling effect. Two such spring block elements may be horizontally positioned in a compression spring unit between a stationary beam and corresponding pivot arms which are vertically spaced from the stationary beam.

Abstract: A fluid filled vibration isolator having a pair of chambers separated by a partition in which is formed an inertia track passageway cooperable with a decoupler to provide certain dynamic operating characteristics is provided with a means for varying the compliance of one of the chambers to enable the dynamic operating characteristics to be precisely adjusted in the course of operation. In the embodiment disclosed, an air chamber is superimposed above a fluid chamber and is separated therefrom by a diaphragm movable into the chamber in response to a differential control pressure, such as a vacuum, applied therein. A shutter panel is mounted to the underside of the diaphragm and moved therewith into and out of engagement with a rigid stop surrounding the diaphragm. When disengaged from the stop, the air chamber contributes to the overall compliance of the fluid chamber.

Abstract: A sole for a shoe is described formed from a composite material. The composite material includes a plurality of plies with each ply having a plurality of high modulus, preferably unidirectional, fibers oriented at an angle from about .+-.40.degree. to about .+-.90.degree. relative to the longitudinal axis of the sole. The fibers are embedded within and bonded together by a low modulus resilient matrix. The sole is highly compliant about the forward roll axis of the sole while providing for lateral stability.

Abstract: A connector for detachably joining the ends of a pair of optical fibers is described that utilizes a unitary V-form groove for coaxial alignment of the fibers to be joined. The fibers can be assembled into the connector one at a time. Positive means are provided to insure positioning of the fibers in end-to-end relation.

Abstract: Unsaturated addition-polymerizable urethane resins prepared from at least one polyisocyanate, at least one monomeric or polymeric polyol, and at least one unsaturated addition-polymerizable monomeric organic compound characterized by the presence of a single isocyanate-reactive active hydrogen group, wherein said polyol has a hydroxyl functionality of at least 2.1, and the amount of polyisocyanate is sufficient to provide an NCO:OH ratio, with respect to said polyol, of at least 2.1:1, are characterized by reduced viscosity, improved physical stability, and by improved solubility and compatibility in organic solvents/diluents. Particularly advantageous resins are obtained by employing isocyanate-functional prepolymers as precursors for such unsaturated addition-polymerizable urethane resins.

Abstract: A plurality of parallel and laterally spaced impermeable walls define an array of side-by-side elongate fluid filled cavities. Adjacent open ends of the cavities provide a sound-receiving or admittance end for the sound waves into the cavities. An acoustically reflective, preferably impermeable, barrier is disposed adjacent the ends of the cavities remote from their sound-receiving end and terminates the cavities. The cavities are uniquely configured to provide an effective geometrical sound-absorbing structure while minimizing the structural elements required and, thus, the cost of manufacture.

Abstract: Acyloin urethanes can be employed to effect photopolymerization of free radical-polymerizable compositions in inert and oxygen-containing atmospheres.

Abstract: A prosthesis for knees and other joints comprises two portions which are disposed side by side and which are at least partially spaced apart from one another. Each portion of the prosthesis includes a pair of spaced apart, relatively inextensible primary components. Disposed between and spaced from the primary components in each portion of the prosthesis is a pivot member. Each pivot member is resiliently secured to the two corresponding primary components of its portion of the prosthesis so as to permit and accommodate relative rotation between the pivot member and the primary components. As a result, the two primary components of each portion of the joint prosthesis can rotate toward and away from one another about an axis that is disposed at least adjacent to and at least approximately parallel to a central axis of the corresponding pivot member. The pivot member and the primary components of each portion of the prosthesis are preferably secured together by one or more bodies of elastomer.

Abstract: A joint prosthesis comprises two relatively inextensible primary components that are spaced apart from one another. Disposed between and spaced from both of the components is a pivot member. The pivot member is resiliently secured to each of the primary components so as to permit relative rotation between the primary components and the pivot member. As a result, the two primary components of the prosthesis can rotate toward and away from each other about an axis that is disposed at least adjacent to and at least approximately parallel to a central longitudinal axis of the pivot member. The pivot member and the primary components of the prosthesis are preferably secured together by one or more bodies of elastomer.

Abstract: Acyloin urethans can be employed to effect photopolymerization of free radical-polymerizable compositions in inert and oxygen-containing atmospheres.

Abstract: Novel structural adhesive systems for metal-bonding applications. The adhesives, comprising a solution or dispersion of a polymeric material in a monomer copolymerizable therewith having incorporated therein certain phosphorus-containing compounds, are characterized by an unexpected ability of providing strong adhesion to untreated metal surfaces without adversely affecting adhesive performance, including resistance to deleterious environments. The environmental resistance of the herein described adhesives can be further improved by the addition of one or more polybasic lead salts, metal molybdates and metal phosphates.

Abstract: An adjustable support system mounts one member, such as a textile spindle, on a second member, such as a textile machine rail, so as to reduce the transmission of vibrations between the two members. The support system incorporates a flange to which is secured an elastomeric element for resiliently mounting the textile spindle relative to the flange. The flange is kept spaced apart from the machine rail by a member or members that at least contact the flange and at least contact the machine rail. The spacing between the flange and the machine rail can be adjusted through manipulation of adjusting screws or bolts in such a manner as to change the orientation of the flange and the textile spindle mounted on the flange relative to the machine rail. Like the spacing member, the adjusting elements contact both the flange and the machine rail.