Abstract: Difficulties in cooling the rotor (28) of a dynamoelectric machine carrying a rotating rectifier (54) are avoided by providing a coolant inlet 68 extending to the interior of a rectifier housing 50 through which the coolant may flow to emerge from a port 66 in the housing 50 and flow via an annulus 52 within the rotor shaft 30 to conduits 98 to cool the rotor windings 48. The coolant is returned to the interior of the rotor shaft 30 and ultimately to a coolant outlet 84.
Abstract: The high cost of providing a heavy duty radiator is minimized in a radiator having a core and tank assembly 22 including a heat exchanger core 24, a pair of spaced headers 26, 28, a pair of spaced side pieces 34 on each side of the core 24, and a pair of tanks 36, 38 secured to respective ones of the headers 26, 28. A separate rectangular frame is provided for the core and tank assembly 22 and is made up of two each of first and second channels, 10, 12; 14, 16 with the first channels 10, 12 being substantially identical and the second channels 14, 16 being substantially identical. The first channels 10, 12, are disposed at opposite ends of the core and tank assembly 22 and encompass corresponding ones of the tanks 36, 38 while the second channels 14, 16 fit about the side pieces 34 and tightly embrace the same to provide pressure resistance.
Abstract: A gantry module which may be transported to a building site and simply placed on site to provide protection for pedestrians. Each gantry module is adapted to be secured to adjacent similar modules to provide a gantry assembly. In addition clamp means perform the dual function of securing adjacent modules and also securing a removable hand rail to the assembly. The modules are of generally rectangular form but may be of any desired shape and may include folding legs to enable transportation of a large number of modules.
Abstract: The heat exchanger having a pair of elongated, tubular headers 10, 12 with tubes 14 extending between the headers 10, 12 and in fluid communication with the interiors thereof. Opposed slots 32, 34; 34, 52; 34, 56, 58; extend generally transverse to the length of the tubular headers 10, 12 and a baffle piece 26, 26', 26", 26"' and 26"" located in such slots.
Abstract: A coaxial drive shaft system is provided with an overload shearable coupling for driving multiple outputs from a single input. A pair of coaxial, telescoped drive shafts are provided as independent outputs to a pair of driven devices. A singular input shaft is coupled to the drive shafts by a gearbox for simultaneously rotating the drive shafts. A shear section is formed in one of the drive shafts for rupturing the one drive shaft in response to an overload condition thereon, while the other coaxial, telescoped drive shaft continues to be rotated by the singular input shaft.
Abstract: An automatic neutral position locking system for a control surface of an aircraft. A hydraulic prime mover is provided for moving the control surface. A locking device is capable of locking the control surface against movement. A ratchet-and-pawl device is operatively associated with a rotary drive train between the prime mover and the control surface for actuating the locking device in response to the control surface reaching a neutral position. The ratchet-and-pawl device normally is maintained in inactive condition when hydraulic pressure exists in the prime mover. A pneumatic piston-and-cylinder device, when under pressure, maintains the ratchet-and-pawl device in normally inactive condition. With a loss of hydraulic pressure, the ratchet-and-pawl device is effective to actuate the locking device in response to the control surface itself reaching the neutral position as the control surface moves under external loads.
Abstract: Carbon buildup in a turbine engine including a compressor 16 coupled to a turbine wheel 22 mounted for rotation about an axis and having a nozzle 24 disposed to direct gas at the turbine wheel 22 to drive the same, an annular combustor 26 disposed about the axis and in fluid communication with the nozzle 24 and having a radially inner wall 32, a radially outer wall 34 and a generally radially extending wall 46, a plurality of fuel injectors 48, a compressed air plenum 42, 44, 45 surrounding the combustor 26, a plurality of circumferentially spaced apertures 66 in the radial wall 34 and a cooling strip 68 for directing air passing through the apertures 66 along the radial wall 39 is reduced by locating the apertures 66 closely adjacent the radially outer part of the radial wall 39 and locating the cooling strips 68 to direct air passing through the apertures 66 inwardly as at 72 along the radial wall 39.
Abstract: The combustion dynamics and efficiency of a gas turbine having an annular combustor 26 provided with fuel injection nozzles 50 that inject fuel generally tangentially is improved by providing the walls 32, 34, 39 of the combustor 26 with cooling air film injectors 70, 86; 72, 88; 74, 90 at substantially equally angularly spaced locations about each such wall and which are oriented to generally tangentially inject a film-like air stream on the associated wall 32, 34, 39.
December 28, 1987
Date of Patent:
May 29, 1990
Jack R. Shekleton, Colin Rodgers, John P. Archibald
Abstract: In order to obtain a self-control of the working pistons with a simple, space-saving construction in the case of a radial-piston engine having pot-shaped pistons which are in contact with the circumference of an eccentric shaft and into which there engages in each case a guide body mounted radially outside on the housing in floating arrangement, and having fluid ports in the cylinder cover for the inflow and outflow of the pressure fluid, a control element (15), connected in jointed manner to the guide body (5), is adjustably disposed in the cylinder cover (9) or a corresponding component of the housing, for controlling the inflow and outflow ports (19, 20).
November 29, 1988
Date of Patent:
May 22, 1990
Paul Pleiger Maschinenfabrik GmbH & Co. KG
Abstract: A pressure relief and vacuum vent valve includes a valve body defining a cylinder having an inwardly facing valve seat. A valve piston is positioned in the cylinder and includes an annular closure portion axially movable toward and away from the valve seat to close and open the valve. The piston has an axial bore. A spring, of considerable rate, urges the valve piston closure portion toward the valve seat. The piston is selectively movable axially against the spring to open the valve and release pressure from within the valve body. A flexible duckbill vent valve is integral with the valve piston within the bore and opens inwardly for venting fluid therethrough only in response to vacuum within the valve body.
Abstract: Warping of the rear turbine shroud 54 and the resulting cracking of turbine nozzle vanes 24 may be eliminated in a radial inflow turbine having an annular combustor 30 with a radially outer wall 32 opening on a compressed air plenum 48 by locating a plurality of tubes 70 on the radially outer wall 32 in fluid communication with the plenum 48 and extending the tubes 70 inwardly so that the radially inner ends 76 are adjacent the radially outer edge 56 of the turbine shroud 54. The tubes 70 thus direct sweeping streams of cooling air along the rear turbine shroud 54 to cool the same and prevent warpage.
Abstract: The turbine engine may be started without the use of start injectors by a method including the steps of initiating rotation of a compressor and turbine wheel by applying an external angular accelerating force thereto, introducing fuel through a minority of the fuel injectors employed at about 5-10% of rated engine speed while continuing the application of the accelerating force, introducing fuel through the remainder of the injectors after ignition of the fuel introduced by the prior step and when the engine reaches 15-25% of rated speed while maintaining injection through the minority of injectors, and thereafter modulating fuel flow through all of the injectors to operate the engine in a desired fashion. Also disclosed is a turbine engine practicing the foregoing method.
Abstract: A commutator shell suitable for receiving a molded commutator core is fabricated by providing an elongated ribbon of electrically conductive material. The ribbon is passed through a set of rollers to form a plurality of relatively shallow preliminary grooves of a given width longitudinally on one side of the ribbon to partially displace the conductive material. The ribbon is passed through a subsequent set of rollers to form the preliminary grooves to a full depth and to completely displace the material to a width substantially equal to that of the preliminary grooves to form the predetermined pattern of grooves between adjacent ribs. The ribbon is passed through a further set of rollers to form valleys in the tops of the ribs and to divide the ribs into dove-tailed cross-sections overhanging adjacent grooves.
Abstract: An air circulation system for a refrigeration apparatus provides a controllable baffle for selectively opening or closing dual output ports. Particularly, the refrigeration apparatus includes an evaporator and an evaporator fan providing flow of refrigerated air. The fresh food compartment is to be cooled by the refrigerated air. First and second air inlet passages are provided in communication with the fan and upper and lower zones in the compartment for delivering refrigerated air in the compartment. First and second air outlet passages are provided in communication with the compartment and the fan for returning air from the compartment upper and lower zones to the fan. A baffle is mounted at the first and second air outlets and has independent open positions for each outlet allowing movement of air through its associated zone, and a closed position for each outlet preventing movement of air through such zone.
Abstract: A brake system for use in a fishing reel of the type having a housing and a spool mounted for rotation relative to the housing about an axis. The brake system consists of a brake surface on the housing, a brake arm having a brake pad, with a brake surface press fit structure for retaining the brake arm in operative position on the spool for rotation therewith, and structure mounting the brake pad on the brake arm so that the brake surface on the brake pad moves biasably against the housing brake surface under a predetermined centrifugal force developed through rotation of the spool.
Abstract: The pump head liner of a small-size precision reciprocating metering pump, which has its application particularly in High Performance Liquid Chromatography (HPLC), is made of transparent material, preferably of synthetic sapphire or monocrystalline zirconium oxide. A pump head casing is designed such that a pump head liner is visually accessible. Cartridge-type check valve units of transparent components are associated with the pump head casing and pump head liner and mounted to be visually accessible. The opening and closing of a ball in a check valve unit can be monitored by an optical sensing system in order to obtain a feed-back signal for governing a control circuitry, having the purpose of compensating the influence of the specific compressibility of the liquid being pumped, upon the pumping efficiency of the displacement system under conditions of high and highest working pressures.
Abstract: The use of a single main centrifugal fuel pump for supplying fuel to an aircraft gas turbine engine has advantages over other known systems, however a problem has existed in that the centrifugal pump, when driven in a fixed ratio to the engine speed, cannot deliver fuel at adequate pressure under engine starting conditions. The disclosed fuel supply system using a main centrifugal pump overcomes this shortcoming by having a turbine-driven start pump added to the fuel supply system with both the turbine and the start pump receiving fuel pumped by the main centrifugal pump and the turbine utilizing the high flow, low pressure fuel to drive the start pump which increases the pressure of the fuel to a value adequate for engine starting. The start pump delivers fuel until such time as the main centrifugal fuel pump has reached a speed to provide the fuel to the engine at the required pressure, at which time the turbine is no longer driven and the output of the start pump goes to zero.
Abstract: A continuous business form including an elongated ply of label stock having one side coated with a pressure sensitive adhesive and of a desired width. An elongated ply of release liner stock of the same width is engaged with the adhesive in such a way that the plies are laterally offset. Consequently, a narrow longitudinal strip of adhesive unengaged with the release liner exists on the label stock ply. An elongated ply of record or message bearing stock is adhered to such edge of the label stock at the narrow longitudinal strip of adhesive.