N75-13266 National Aeronautics and Space Administration. Pasadena Office, Calif. GENEVA MECHANISM Patent Application Robert H. Summers (JPL) and Ralph L. Kenney, inventors (to NASA) (JPL) Filed 24 Dec. 1974 5 p Filed 2 Nov. 1973 Sponsored by NASA (NASA-Case-NPO-13281-1; US-Patent-3,855,873; US-Patent-Appl-SN-412079; US-Patent-Class-74-436; US-Patent-Class-74-820) Avail: US Patent Office (12 - 14. p 1679) CSCL 131 An improved Geneva mechanism is characterized by a driven star-wheel having a segmented cam-follower surface. Star-wheel driver includes a restraining cam having a segmented cam surface for engaging the cam-follower surface of the star-wheel and antifriction rollers pinned to the restraining cam for engaging the cam-follower surface. Official Gazette of the U.S. Patent Office N75-13268*# National Aeronautics and Space Administration. Howell D. Garner, inventor (to NASA) Filed 11 Dec. 1974 11 p (NASA-Case-LAR-11643-1: US-Patent-Appl-SN-531649) Avail: NTIS HC $3.25 CSCL 13K The development and characteristics of a servo valve for controlling the flow of gaseous or hydraulic fluids to servo motors are discussed. A venturi-shaped arrangement is used in which the pressure change to the servo is as great as twice the supply pressure. There is a linear relation between the position of the flapper valves relative to the end of the first conduit and the pressure applied to the servo. Diagrams of the device are provided. NASA Bonding of an element comprising sapphire, ruby or blue sapphire to another element of such material with a eutectic mixture of aluminum oxide and zirconium oxide is discussed. The bonding mixture may be applied in the form of a distilled water slurry or by electron beam vapor deposition. In one embodiment the eutectic is formed in situ by applying a layer of zirconium oxide and then heating the assembly to a temperature above the eutectic temperature and below the melting point of the material from which the elements are formed. The formation of a sapphire rubidium maser cell utilizing eutectic bonding is shown. Official Gazette of the U.S. Patent Office (NASA-Case-MSC-19095-1; US-Patent-3,864,542; US-Patent-Appl-SN-415486; US-Patent-Class-219-137) Avail: US Patent Office CSCL 13H A method for controlling grain size and weld puddle agitation in a tungsten electrode inert gas welding system to produce fine, even grain size and distribution is disclosed. In the method the frequency of dc welding voltage pulses supplied to the welding electrode is varied over a preselected frequency range and the arc gas voltage is monitored. At some frequency in the preselected range the arc gas voltage will pass through a maximum. By maintaining the operating frequency of the system at this value, maximum weld puddle agitation and fine grain structure are produced. Official Gazette of the U.S. Patent Office .-16 INERT GAS N75-18574 National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, Md. MAGNETIC BEARING Patent Philip A. Studer, inventor (to NASA) Issued 11 Feb. 1975 6 p Filed 22 Dec. 1970 (NASA-Case-GSC-11079-1; US-Patent-3,865,442; US-Patent-Appl-SN-100637; US-Patent-Class-308-10) US Patent Office CSCL 131. Avail: A magnetic bearing is described which includes a pair of coaxial, toroidal, and permanent magnets having axially directed poles. Like poles of the permanent magnets are adjacent to each other, whereby the permanent magnets have a tendency to be urged apart along the common axis. An electrom/gnet is wound coaxially with the permanent magnets in such a manner that the poles are axially directed. Between the poles of each permanent magnet there is a low magnetic reluctany.e circuit including two series air gaps. Between the poles of the electromagnet a low reluctance path including only one air gap of each of the low magnetic reluctance circuits is provided. The low reluctance path for the electromagnet includes a ring axially translatable relative to the permanent magnets. The ring forms opposite faces of the air gaps in the magnetic circuits for each permanent magnet. Official Gazette of the U.S. Patent Office N75-19683 National Aeronautics and Space Administration. William F. Iceland (N. Am. Rockwell Corp., Downey, Calif.) and N75-19686* National Aeronautics and Space Administration. Marshall Space Flight Center, Huntsville, Ala. INTERNALLY SUPPORTED FLEXIBLE DUCT JOINT Patent Ralph F. Kuhn, Jr., inventor (to NASA) (Rocketdyne, Canoga Park, Calif.) Issued 4 Mar. 1975 5 p Filed 16 Apr. 1974 Sponsored by NASA (NASA-Case-MFS-19193-1; US-Patent-3,869,151; US-Patent-Appl-SN-461477; US-Patent-Class-285-114: US-Patent-Class-285-226) Avail: US Patent Office CSCL 13G An internally supported, flexible duct joint for use in conducting fluids under relatively high pressures in systems where relatively large deflection angles must be accommodated is presented. The joint includes a flexible tubular bellows and an elongated base disposed within the bellows. The base is connected through radiating struts to the bellows near mid-portion and to each of the opposite end portions of the bellows through a pivotal connecting body. A motion-controlling linkage is provided for linking the connecting bodies, whereby angular displacement of the joint is controlled and uniformity in the instantaneous bend radius of the duct is achieved as deflection is imposed. Official Gazette of the U.S. Patent Office (NASA-Case-LEW-11274-1; US-Patent-3,874,677; A high-speed, self-acting circumferential type shaft seal for use in turbine engines is disclosed. One or more conventional circumferential ring seals having a central aperture are mounted in a housing. In three of the four embodiments of the invention, a helical groove and one or more dam seals are cut in the inner cylindrical surface of the one or more ring seals. In a fourth embodiment, two or more lift pads are disposed in surface contact with the inner cylindrical surface of the seal rings. To the outside of the lift pads, two dam seals are cut in the inner cylindrical surface of two of the ring seals. In each of the embodiments, a net outward radial force was produced during rotation of the turbine causing the ring seals to lift out of contact with the turbine shaft to minimize wear of the ring seals. Official Gazette of the U.S. Patent Office 20 30 96 52 38 N75-25185* National Aeronautics and Space Administration. Pasadena Office, Calif. ULTRASONICALLY BONDED VALUE ASSEMBLY Patent Richard J. Salvinski, inventor (to NASA) (TRW Systems Group. Redondo Beach, Calif.) Issued 1 Apr. 1975 7 p Filed 28 Sep. 1973 Sponsored by NASA (NASA-Case-NPO-13360-1; US-Patent-3,874,635; US-Patent-Appl-SN-401920; US-Patent-Class-251-333; US-Patent-Class-228-1) Avail: US Patent Office CSCL 13G A valve apparatus capable of maintaining a fluid-tight seal over a relatively long period of time by releasably bonding a valve member to its seat is described. The valve member is bonded or welded to the seat and then released by the application of the same energy to the bond joint. The valve member is held in place during the bonding by a clamping device. An appropriate force device can activate the opening and closing of the valve member. Various combinations of material for the valve member and valve seat can be utilized to provide an adequate sealing bond. Aluminum oxide, stainless steel, inconel, tungsten carbide as hard materials and copper, aluminum, titanium, silver, and gold as soft materials are suggested. Official Gazette of the U.S. Patent Office Official Gazette of the U.S. Patent Office An adjustable hole cutter is described for use in forming circular openings in workpieces. The hole cutter is characterized by a mount of a substantially planar configuration, positionable into a plane paralleling the working plane of a selected workpiece. It also contains a shaft for imparting rotary motion to the mount about an axis of rotation normally related to the working plane, a plurality of stabilizing struts for resiliently supporting the mount in parallelism with the working plane as rotary motion is imparted thereto, a drill bit for drilling a pilot hole concentric with the axis of rotation, and an elongated cutting tool adjustably seated within a radially extended slot. Official Gazette of the U.S. Patent Office onto a suitably shaped spool. CUT FILAMENTS FORM PASTE OF CUT FILAMENTS, WATER, METAL POWDER AND PLASTICIZER EXTRUDE PASTE TO ALIGN FILAMENTS N75-26371* National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt, Md. PROCESS FOR MAKING SHEETS WITH PARALLEL PORES OF UNIFORM SIZE Patent Joseph M. Sherfey, inventor (to NASA) Issued 3 Jun. 1975 8 p Filed 24 Mar. 1971 (NASA-Case-GSC-10984-1; US-Patent-3,887,365; US-Patent-Class-29-420.5; US-Patent-Class-65-3; US-Patent-Class-75-212; US-Patent-Class-75-222; 13H Processes for making sheets with parallel pores of uniform size are described. In one form, the process comprises the steps of extruding a slurry formed of short, nonmetallic filament pieces, a metal powder, water, and a plasticizer through a suitable orifice to align the filament pieces parallel to one another; cutting the extrusion into suitable sections; stacking the sections in parallel in a refractory container; compacting the stack; heating the stack in a reducing atmosphere; compacting while hot, if necessary: slicing, at right angles to the longitudinal axis of the original sections, the thusly formed billet into sheets; and leaching out the filament pieces in each sheet. In a alternate form, a continuous filament was used. The continuous filament is drawn through a slurry containing metal powder which may include a solder, water and a plasticizer rather than being extruded through an orifice. In a still further form, the continuous coated filament is wound N75-26372* National Aeronautics and Space Administration. Marshall Space Flight Center, Huntsville, Ala. METHOD OF DETERMINING BOND QUALITY OF POWER TRANSISTORS ATTACHED TO SUBSTRATES Patent Thomas A. Telfer, inventor (to NASA) (GE, Utica, N. Y.) Issued 10 Jun. 1975 4 p Filed 26 Apr. 1974 Sponsored by NASA (NASA-Case-MFS-21931-1; US-Patent-3,889,122; US-Patent-Appl-SN-464721; US-Patent-Class-250-359; A method of determining the quality of the bond between a power transistor and an electrically insulative, heat conductive substrate is described; the method takes X ray exposure of the bond. In the exposures, the areas where the bond quality is poor show up as dark in relation to a lighter background area where the bond quality is good. The exposures are tested in a light meter device in which the average transparency of on exposure indicates the percentage of voids, or poorly bonded areas. Only those units having less than a predetermined percentage of voids are acceptable. X-RAY SOURCE Official Gazette of the U.S. Patent Office N75-27376* National Aeronautics and Space Administration. (NASA-Case-XMS-01330; US-Patent-3,275,794; 131 Welding apparatus for fusion butt welding adjacent edges of objects such as thin metal sheets is described. The members N75-29426* National Aeronautics and Space Administration. (NASA-Case-XLE-10717; US-Patent-3.004,189; A remote-operated combination plasma torch and shutoff valve is described which may be employed to control the attitude of a satellite and which is characterized by high efficiency and extreme gas economy. A satellite-propulsion apparatus is discussed of the type in which a multiplicity of bursts of power are employed to maintain the vessel oriented in space. It was adapted to prevent or minimize loss of propellant at the beginning and end of each power burst and to maintain the increased efficiency of the arc-jet propulsion system as compared to other propulsion systems. Official Gazette of the U.S. Patent Office N75-31446* National Aeronautics and Space Administration. Lewis Research Center, Cleveland, Ohio. DRILLED BALL BEARING WITH A ONE PIECE ANTITIPPING CAGE ASSEMBLY Patent Arthur S. Irwin, inventor (to NASA) (Marlin-Rockwell Corp.) Issued (NASA-Case-LEW-11925-1; US-Patent-3,905,660; A drilled ball bearing is disclosed which has a pair of projections machined or otherwise formed from the inner surface of each of the cage pockets. These projections prevent misorientation of the openings of the drilled passages of the balls with respect to the surfaces of the inner and outer races. The machining of the projections from the inner surface of each of the cage pockets forms a unitary one piece structure which has improved resistance to fragmentation caused by either thermal or vibrational effects when compared to conventional two piece anti-tipping cage assemblies. Official Gazette of the U.S. Patent Office |