Abstract: In an aircraft having a pair of engines mounted forwardly of the wing and discharging jet exhaust over the wing for augmented lift, a trailing edge flap is positioned directly behind each of the engines. Each flap has a stowed position for the cruise mode, a rearwardly and downwardly extending position for maximum deflection of the jet exhaust downwardly for STOL operation, and various intermediate positions. The upper aerodynamic surface of each flap is curved in a manner that the radius of curvature increases along the chord length of the flap from the forward knee of the flap to the trailing edge of the flap. Each flap is moved from its stowed position, through intermediate positions to its fully deployed position in a manner that the upper aerodynamic surface of each flap forms a smooth and continuous extension of the fixed rear portion of the upper aerodynamic surface of the wing.

Abstract: A drawing assembly configured for outlining the margin of a mat having a generally elliptical-shaped cut therein in a pattern replicating that of the cut, adapted for attachment to the mat cutting apparatus employed to make the cut, is comprised of a carriage slide member for adjustably securing a pen member at a selected location in cooperative engagement on a guide arm of a mat cutting apparatus, a pen member including a reservoir and a nib received in a stem member having a positioning arm thereon, a pen holder depending from the slide member including a barrel for receiving the stem member in axially reciprocable engagement therewith to permit the pen member to move between a lowered operating position and a raised non-operating position, a biasing member disposed within the barrel for biasing the pen member toward the operating position, and a locating member for guiding the nib when the pen member is in its operating position and the guide arm is set in motion.

Abstract: A hunter's tree stand (10) comprising a planar seat member (16) of generally rectilinear form having a pair of opposed generally V-shaped notches (18, 19) formed in its opposite ends which are adapted to engage and partially surround, in intimate face-to-face relation, the facing portions of a pair of diverging tree branches (14, 15) at the fork (11) formed thereby, a sharp, laterally projecting V-shaped metal knife-like edge (20) secured to the undersurface of the seat member (16) in juxtaposition to and projecting laterally from the first V-shaped notch (18), and an L-shaped bracket (22) releasably secured to the undersurface of the seat member (16) by means of one or more bolt and nut combinations (29, 31) for permitting lateral extension of said L-shaped bracket (22) relative to the second of the V-shaped notches (19) to permit the depending bracket leg (25) to be placed in face-to-face contact with the other of the diverging branches (14) and positively secured thereto by one or more threaded fasteners (

Abstract: A "U" shaped mounting head in which is mounted a removeable retaining device adapted to retain a cleaning pad therein. The retaining device has sidewalls that fit against side surfaces of a recess of the mounting head, and an upper and a lower oppositely extending flange on opposite side walls to engage related upper and lower surfaces of the mounting head so as to be retained securely in the recess.

Abstract: An audio amplifier connected to the secondary winding of a transformer. The primary winding of the transformer is connected in a series with a triac to a conventional power source, such as a 60 hertz, 115 to 120 volt source of alternating current. The triac is turned on at a predetermined time during the latter portion of each half cycle to cause a current pulse to be transmitted through the primary winding. To make the triac non-conductive to terminate each pulse, there is provided a bypass circuit (comprising a second triac and a capacitor in series) connected in parallel with the first triac. A tank circuit is connected in parallel with the transformer primary to cause an oscillation in the primary winding, so that the second triac can be turned on at a time of low current to shunt the first triac, thus causing it to turn off and terminate the current pulse.

Abstract: A cleaning cassette for cassette recorders in which movement of either spindle of the cassette recorder operates a cleaning element within the cassette casing. Transmission of the rotary movement is achieved by a pair of rotatably mounted reel hubs and a pair of exterior toothed wheels, one integral with each hub, with the reel hubs coupled together by a third intermediate exterior toothed wheel to form a permanent gear train. For driving a cleaning element, such as a felt tab, the intermediate wheel drives a cam and lever. By rotating either toothed wheel, the intermediate wheel causes the lever to move the tab alternately back and forth substantially parallel to the front edge of the cassette casing.

Abstract: A method for fabricating a precision fine-line die by chemical milling the working face of an etchable workpiece to form a plurality of raised die elements separated and bounded by a plurality of cavities, is comprised of the steps of forming an etchant-resistant surface pattern of boundary grooves penetrating slightly into the working face of the etchable workpiece outwardly proximate and substantially conforming to the configuration of die element precursors, and then selectively etching the workpiece in regions outwardly bounded by the boundary grooves to undercut same and form recessed cavities outwardly proximate and substantially conforming to the complementary configuration of the die element precursors. The step of forming the boundary grooves is preferably a two stage procedure comprised of first chemical milling shallow grooves in the workpiece in the desired pattern and then loading these grooves with an etchant-resistant fill.

Abstract: A supersonic two spool turbofan engine capable not only of developing sufficient power to accelerate up to supersonic cruise and maintain efficient operation at supersonic cruise, but also arranged to cruise at subsonic velocities with a relatively low specific fuel consumption. The engine is provided with a variable bypass passageway downstream of the compressor. Flow into the bypass passageway is controlled so that during low power setting the bypass passageway is closed so that all the gaseous flow is directed through the turbine. During higher power settings, the bypass passageway is opened to the extent that a selected portion of the gaseous flow is directed through the bypass passageway to bypass the first stage of the turbine section so that the corrected flow to the first turbine stage remains substantially constant for high and low power setting of the engine.

Abstract: An airfoil having a trailing edge flap assembly comprising a flap member having a track mounted thereto. The track member is operatively connected to a slide-block which is in turn mounted to stationary structure. High Fowler motion is accomplished with this arrangement. In another embodiment the flap is additionally provided with a foreflap. In further embodiments, the flap assembly is provided additionally with aft flaps.

Abstract: A basketball rim assembly especially adapted to relieve forces which normally are imparted to the backboard of conventional basketball rim assemblies. There is a rim of conventional configuration mounted to a support plate which fits against the forward face of the backboard. There is a rear support plate on the backside of the backboard fixedly attached to the front plate. This rear plate in turn transmits loads exerted thereon into a base frame structure. Additionally, the rim is provided with a release mechanism which permits it to rotate downwardly from its horizontal position when an impact load of sufficient magnitude is exerted on the rim (such as those occurring in the execution of a dunk shot.

Abstract: In an aircraft having a pair of engines mounted forwardly of the wing and discharging jet exhaust over the wing for augmented lift, a trailing edge flap is positioned directly behind each of the engines. Each flap has a stowed position for the cruise mode, a rearwardly and downwardly extending position for maximum deflection of the jet exhaust downwardly for STOL operation, and various intermediate positions. The upper aerodynamic surface of each flap is curved in a manner that the radius of curvature is a constant and uniform minimum at a forward portion of the flap and substantially greater at a rear portion of the flap. Each flap is moved from its stowed position, through intermediate positions to its fully deployed position in a manner that the upper aerodynamic surface of each flap forms a smooth and continuous extension of the fixed rear portion of the upper aerodynamic surface of the wing.

Abstract: A shoe cleaner for removing debris from the sole of a shoe is comprised of a foraminous scraper for contacting the sole of a shoe and, upon relative motion therebetween, removing debris therefrom and a wick member for applying a liquid deodorant and/or solvent for the debris to the shoe from a reservoir proximate the foraminous scraper. The shoe cleaner disclosed herein also preferably includes a mat for removal of any excess deodorant and/or solvent and for secondary removal of debris from the sole of the shoe.

Abstract: A self-service station where a number of parties, each having an individual operating key or card, can pump gas from a single pump by inserting the key or card into a matching slot to activate the pump. When the fuel begins to flow to the discharge nozzle, a pulsing device is activated to register on a counter the amount of fuel pumped. To prevent pumping of fuel under circumstances where the pulsing device is not operating, there is a timer that shuts off the pump if the pulsing device does not become operative after a certain period of time. The timer is arranged with a flow responsive switch so that the time period is measured from the time fuel actually begins to flow to the time that the pulsing device starts to operate. This permits the time period to be made relatively short to minimize the pumping of fuel without recording the same on the counter.

Abstract: Apparatus, especially portable apparatus, for forming shaped edge profiles on the edges of sheet material wherein the sheet material is characterized by thickness non-uniformities; yet, wherein the root face thickness--i.e., that portion of the shaped sheet edge thickness from which no material is removed--of the shaped edge formed is maintained constant irrespective of thickness non-uniformities inherently present in such sheets. More specifically, apparatus which particularly, but not exclusively, advantageous in preparing the edges of sheet material (such, for example, as sheet aluminum) for subsequent welding operations by routing or the like, where it is critical that the root face thickness of the shaped edge remain of constant thickness irrespective of thickness variations inherently present in the sheet material itself.

Abstract: Right and left FM stereo signals are combined to form an L plus R value and subtracted to produce an L minus R value. The L minus R value is passed through a high-pass filter which mutes the high frequency portion of the signal only when the amplitude of the signal is low. This is recombined with the L plus R signal to provide a 2L output. A similar process is followed to produce a 2R output.The two left and right outputs are combined and then passed through a mono to stereo converter to produce two phase-shifted signals. These are in turn selectively delayed and passed through respective band pass filters to mute signal portions between approximately five hundred to one thousand Hz. The combined signals, prior to being converted back to a stereo signal are directed through a second band pass filter to mute the frequency portions other than the five hundred to one thousand Hz level, and these are recombined with the rest of the signal.

Abstract: A plurality of fasteners joining a sun visor to an automobile. Each fastener fits through a related pair of matching holes in the visor and automobile body, with the hole in the visor being enlarged to permit lateral movement of the visor relative to the fastener. A washer fits over the fastener and against a flange of the fastener. In the fastening position, the flange presses against the washer which in turn presses against the visor, permitting slide movement therebetween. When there is relative movement between the visor and the automobile body due to expansion and contraction because of temperature change, the fasteners permit relative movement without creating stresses in the visor.

Abstract: A retractable/deployable nozzle fairing for use with a center boost engine on a jet propelled aircraft having the capability of aerodynamically fairing the center boost engine's exhaust nozzle and reducing the diameter of the empennage outlet when deployed so as to minimize the base drag characteristics of the empennage body structure when the center boost engine is shut down. More particularly, an exhaust nozzle retractable/deployable fairing for use with aircraft of the type commonly employing multiple main power plants and an auxiliary center boost engine of the type which is commonly used only: (i) during take-off; (ii) during air refueling operations, and/or (iii), under certain emergency operating conditions; and, wherein the retractable/deployable fairing member is formed of flexible sheet material that is fabricated into a truncated generally conical nozzle configuration--i.e.

Abstract: A heat exchange apparatus made up of a plurality of sheets, desirably made of thin film plastic, bonded one to another to form a unitized heat exchange structure. Alternate first pairs of sheets are bonded one to another along a first set of longitudinally extending bond lines positioned at first transverse locations along width dimensions of the sheets. There is a second set of pairs of alternately spaced sheets (made up of adjacent sheets of adjoining first pairs of sheets) which are bonded one to another along a second set of longitudinally extending bond lines positioned transversely intermittent of the first set of longitudinal bond lines. These sheets are expanded from one another to form a plurality of diamond-shaped heat exchange passageways arranged in parallel rows. In the preferred form, each end of the heat exchange structure is bonded into a molded base member, which in turn is connected to a related manifold structure.

Abstract: A manually-operated spray applicator for discharging a coating fluid is comprised of a receiving chamber having inlet and outlet ports for respectively admitting and discharging coating fluid under pressure developed by a jet of air issuing slightly upstream of the receiving chamber and created upon the manual stroke of an air-compression piston; a closed compression chamber isolated from the receiving chamber within which the airjet is developed; and a stroke-responsive sealing stem having a central airway with an air jet orifice in registration with the discharge area of the outlet port, which airway is in communication with the compression chamber; wherein the sealing stem is adjustably reciprocable along a line from a biased sealing position closing the outlet port at the beginning of a stroke on the piston, to a retracted position with the airjet removed to a preselected position slightly upstream of the outlet wherein the sealing stem returns to its sealing position prior to the completion of that strok