Abstract: Spacing core materials, such as honeycomb, may be filled with fiberous insulation batting by placing the spacing core on a vibrator over the batting. The lower edges of the core cut through the fiberous material and permit it to fill the core. Additionally, a vacuum from the top side uniformly distributes the material in the core cells in an expanded condition.

Abstract: A lock core panel wherein a face sheet, base sheet and core are integrally joined at each web line by fiber material prior to curing. The upper face sheet comprises layers which may be angularly oriented and selected fibers or strands removed, if desired, to provide desired porosity for noise suppression purposes.

Abstract: A cargo loading and unloading shutoff system is used to control transfer of loads between a cargo aircraft and a loading dock. Control logic means compares commands entered on a control console and the existing conditions in the aircraft and on the dock during a loading or unloading operation. On loading, the logic means shuts off the dock conveyor drive immediately when all loads are transferred to selected aircraft positions and then shuts off the aircract conveyor drive a predetermined period later. On unloading, the logic means shuts off both the aircraft and dock conveyor drives simultaneously when all loads are transferred to selected dock positions. The logic means also prevents energization of the aircraft and dock conveyor drives when the number of load positions selected in the aircraft is different from the number of load positions selected on the dock.

Abstract: A filter spectrograph unit for use in a micro-Raman spectrometer system or a remote sensing system is formed by combining an infinitely variable spectral line rejection filter (having appropriate entrance optics) functionally and operatively with a dispersing spectrograph. The line rejection filter is a modified form of a zero-dispersing double monochromator having an input light signal including laser light scattered from, for example, minute Raman-active particles. The modified double monochromator includes an acylindrical mirror positioned so that the laser line will exit through an aperture in the mirror and all other spectral lines will be reflected and reformed by the modified double monochromator into an output light signal containing all of the original spectral information, less the rejected laser line.

Abstract: A method of making a reinforced insulating foam wherein an open weave fabric is tufted with loops similar to the making of a shag rug in the textile industry. Foaming material is then inserted into the open weave fabric on the side opposite that of the tufted fibers and expanded through the fabric and around the fibers. A rigid non-sticking backing plate is used to direct the foam through the woven fabric such that the fabric is at the surface of the composition and thus may be bonded to the container walls. When foamed downwardly, gravity assists to produce a less dense foam and the fibers are straightened by the foaming action.

Abstract: This invention concerns a multi-layered acoustic liner which breaks up high amplitude sound and shock waves into several waves of the same type but smaller amplitudes, converting some acoustic energy into heat and shifting part of the acoustic energy to a higher frequency level to achieve better absorption by the atmosphere. The sandwich-type perforated plate acoustic liner comprises several layers of honeycomb backing material which are separated by thin perforated sheets.

Abstract: A vent structure for reliable long term operation at high temperatures is fabricated by annealing a tubing of predetermined length and size, filling the tubing with fine alumina particles, flattening and coiling and pressing an upper portion of the tubing at predetermined pressures, annealing the formed tubing, and installing a particulate filter in the undeformed lower portion of the tubing. For use in venting helium generating reactor control pins located under hot molten sodium, a vent assembly including the vent structure and providing an air lock between the outer molten sodium and the vent is affixed to the upper end of each control pin.

Abstract: A filter spectrograph unit for use in a micro-Raman spectrometer system or a remote sensing system is formed by combining an infinitely variable spectral line rejection filter (having appropriate entrance optics) functionally and operatively with a dispersing spectrograph. The line rejection filter is a modified form of a zero-dispersion double monochromator having an input light signal including laser light scattered from, for example, minute Raman-active particles. The modified double monochromator includes an acylindrical mirror positioned so that the laser line will exit through an aperture in the mirror and all other spectral lines will be reflected and reformed by the modified double monochromator into an output light signal containing all of the original spectral information, less the rejected laser line.

Abstract: A bushing for use in high strength materials where fatigue failure is a problem. The bushing is cylindrical and includes a circumferential lubrication groove on its inner surface while fillets and smooth transition surfaces are used to transition between the major cylindrical surfaces of the bushing and the housing. The bushing is pressed into the housing which is an interference fit therewith to reduce stress concentrations. Lubricant is provided to the circumferential lubrication groove by means of a passageway which may include a smooth wall annulus placed in a stepped hole in the housing and retained in the hole by a hollow screw which extends to the area of lubrication. A standard lubrication fitting is threaded into the annulus to provide means for connection to conventional lubricant supplying apparatus.

Abstract: A vent structure for reliable long term operation at high temperatures is fabricated by annealing a tubing of predetermined length and size, placing a predetermined number of strands of stabilized zirconium oxide yarn of predetermined diameter longitudinally into one end of the tubing a predetermined distance therein, flattening and coiling and pressing the end portion of the tubing containing the yarn at predetermined pressures, annealing the formed tubing, and installing a particulate filter in the undeformed (normally lower) portion of the tubing. For use in venting helium generating reactor control pins located under hot molten sodium, a vent assembly including the vent structure and providing an air lock between the outer molten sodium and the vent is affixed to the upper end of each control pin.This is a division of application Ser. No. 376,527, filed July 5, 1973, now U.S. Pat. No. 3,803,816.

Abstract: A projectile recovery system where projectile speed is progressively reduced as the projectile passes through decelerator tubes. These tubes are precharged to high pressure in front of the projectile to minimize the decelerating distance. Quick opening valves, which separate the deceleration tubes and which seal them for pressurization, are opened as the projectile approaches so they will not be struck by the projectile with resulting damage.

Abstract: A saw blade having one tooth tilting to the left, one tooth tilting to the right, and a third tooth straight, repeated throughout the saw blade. Tilt causes the set teeth to be shorter than the straight teeth which first contact and cut the foam and fiber glass strands. The cut strands are free to move away from the following raker teeth which remove additional foam, leaving the desired tufts.

Abstract: The upper floor of a multi-deck pressurized aircraft having frangible floor panels sealing the floor during normal flight conditions yet rupturable under a predetermined environmental condition such as when a relatively high pressure differential exists between the upper cabin and lower cargo compartments. This may occur, for example, when the cargo compartment is depressurized by inflight explosion or collision. Differential pressure activates the panel destruction apparatus which strikes the frangible floor panels in such manner as to cause them to disintegrate or crumble into small pieces. Typical panels may be chemically strengthened glass, ceramics, etc.

Abstract: High gain limited scan operation of phased array antennas is accomplished with microwave circuitry by appropriately coupling the array elements into sub-arrays and establishing a 90.degree. out of phase relationship between even and odd mode power at the aperture of each array element. Even and odd mode power from the feed circuit of each element is coupled to the feed circuit of each nearest adjacent element to form three element overlap subarrays in each plane of scan.

Abstract: Structural support assembly for use in arctic and subarctic (permafrost) areas or in any areas where the upper ground layer is subject to a severe annual freeze-thaw cycle, including the cooperative combination of a support structure and a heat pipe element installed in generally frozen soil. The heat pipe is of a suitably complementary configuration and/or disposition with respect to the support structure to provide appropriate stabilization of the surrounding frozen soil. In one embodiment, the heat pipe element is disposed externally of the support structure and, in another embodiment, it is disposed internally of (and integrally combined with) such structure. The external embodiment further includes one version employing a linear (straight) heat pipe element and another version employing an angular (helical) element.

Abstract: Process for producing microspheres comprises immersing a lower portion of a generally vertical, sol-gel feed tube having a lower microsphere formation needle in an alcohol drying column, feeding sol-gel at a predetermined rate into the upper end of the feed tube, and vibrating the feed tube in a generally horizontal direction at a predetermined amplitude and frequency to produce microspheres from the formation needle of a uniform and predetermined size. An electromagnetic transducer drive for vibrating the feed tube is used in one illustrative embodiment of apparatus for practicing the invention, and an electric motor offset drive is used in another illustrative embodiment of such apparatus. A feed tube having multiple microsphere formation needles at its lower end can be used for producing microspheres in quantity.

Abstract: A continuous belt system engaging and holding for parallel motion multiple layers of fabric. A pair of belts holds the layers along their edges in stacked spaced relationship while the layers pass through tufting and foaming stations in the manufacture of three-dimensional reinforced insulation.

Abstract: A vent structure for reliable long term operation at high temperatures is fabricated by annealing a tubing of predetermined length and size, filling the tubing with fine alumina particles, flattening and coiling and pressing an upper portion of the tubing at predetermined pressures, annealing the formed tubing, and installing a particulate filter in the undeformed lower portion of the tubing. For use in venting helium generating reactor control pins located under hot molten sodium, a vent assembly including the vent structure and providing an air lock between the outer molten sodium and the vent is affixed to the upper end of each control pin.