Abstract: An automated eddy current fastener hole inspection apparatus and method for providing an automatic indication of the presence of a crack in structural members. The device automatically advances the probe of an eddy current instrument in a hole in the structural member, induces an eddy current, detects the eddy current signal produced by the eddy current instrument, digitizes the eddy current signal, analyzes the digitized signal for the presence of a characteristic signature corresponding to the effect of a crack in the structural member upon the eddy current signal, and alerts the operator of the presence of a crack or of noise conditions in the eddy current signal which may mask the presence of a crack. The device is responsive to contiguous repetitions of the characteristic signature of a crack within predetermined time windows to distinguish between data corresponding to a bona fide crack in the structural member from data produced by the effect of noise, dirt, grease, etc. upon the eddy current signal.

Abstract: A sealant applicator assembly (10) for mounting to an automatic drilling and fastener installation machine to apply sealant to the tip or shank surface of a fastener (14) before "wet" installation of the fastener into a hole. The assembly (10) includes a valve member (21) that is opened or actuated by physical movement of the fastener (14) therewith whereby sealant flows into contact with the fastener shank. Upon removal of the fastener (14) from contact with the valve members (21), valve closure takes place due to sealant pressure and sealant flow is stopped. By sequencing the sealant application onto the fastener concurrently with drilling or other hole preparation by the automatic machine, cycle time for "wet" fastener installation is minimized.

Abstract: A method of applying substantially consistent and uniform coatings of a corrosion preventive compound to metallic cable lengths is disclosed which involves the immersion of the cable into a liquid coating compound of controlled viscosity followed by wiping the cable with a compound-containing material upon withdrawal of the cable from the compound.

Abstract: A method to eliminate stresses and consequent warping in elevated-temperature cured adhesive bonded parts with different coefficients of thermal expansion.

Abstract: A dielectric probe comprising a pair of electrically conductive wires embeddable in or mountable on resin matrix composite materials for monitoring changes in the dielectric property of the composite structure due to moisture content therein, thermal spikes or fatigue degradations experienced thereby.

Abstract: A panel of molded plastic or cured composite materials configured to span the space between a pair of beam or support members by a slideable engagement between each of the opposite ends of the panel and its adjacent beam or support member, and the panel sealingly and lockingly engageable along each of its opposite edges to another panel adjacent each edge of the first panel. The panels are fabricated whereby the panel end engagement means with the beam or support members define a predetermined path which in turn is variable as the panels can be arcuately flexed widthwise upon installation engagement with the beam or support members while at the same time minimizing load deflection of the panels lengthwise when installed.

Abstract: A motor drive arrangement for an exposed film take-up canister spool that permits a continuous take-up tension on the spool and yet permitting partial withdrawal of exposed film from the canister for additional exposure without interruption or reversal of the take-up drive.

Abstract: A machine for cutting compound curvature surfaces on a workpiece by a linear or longitudinally extending straight line cutting element that is adjustably movable relative to the workpiece located on a bed of the machine. The cutting element is relatively movable or adjustable to the machine bed in any one of five variable axes or directions, as well as movable or adjustable about any two or more of the five axes or directions of movability and adjustability.

Abstract: A method for measuring such physiological parameters as pulse rate and respiration without physically connecting electrodes or other sensors to the body. A beam of phased energy, for example microwaves, is directed toward the body of a person at a region thereon which undergoes physical displacement corresponding to variations in the parameter being measured. The phase relationship of the energy reflected from the body is compared with that of the transmitted energy to determine the extent of physical movement of the body region as affected by the parameter being measured. The present method may be used as an overt or covert lie detection technique.

Abstract: A power brake punch for curl forming radii of greater than 180.degree. of arc on the edge of sheet metal workpieces.

Abstract: Actuator for selectively and sequentially providing dual pressure forces for positioning and seating fasteners and for other purposes. Air pressure is selectively applied to a first piston to apply a relatively low level of hydraulic pressure to the actuating rod and then to a second pneumatic piston to intensify the hydraulic pressure applied to the actuating rod. The actuator is caused to be extended a first distance at low force and then to be extended an additional distance at a relatively higher force. Air pressure is selectively applied to cause all pistons and the actuating rod to retract to their initial positions.

Abstract: A portable, relocatable, erectable building or shelter structure, and method of erecting, utilizing a pair of laterally spaced elongated and segmented base rail assemblies to which are pivotally connected a pair of erectable arch assemblies for each row of a plurality of panels slidably engageable along two opposite sides to each pair of adjacent erectable arch assemblies pivotally connected to the base rail assemblies. The opposite sides of the individual panels other than the panel sides engageable to the adjacent base pivotally connected erectable arch assemblies are configured such as to be sealingly interengageable with the adjacent panel on both sides.

Abstract: This invention discloses the combination of (1) a liquid temperature conditioning apparatus located exteriorly of a potential explosion sustaining zone, (2) an explosion proof air-liquid heat exchange device located within a potential explosion sustaining zone, and (3) air ducts interconnecting the air-liquid heat exchange device with the interior of a compartment open to the ambient and containing explosion sustaining vapors, such as the interior of an integral fuel tank compartment in an aircraft containing vapors arising from highly volatile hydrocarbon fuels normally carried therein.