Abstract: An improvement in the structure for mounting blades of a ceiling fan, characterized in that a motor comprises a bottom formed with a plurality of brackets each having a recess, the recess having an inner end which gradually decreases in size toward an outer end thereof, each of the blade having an inner end provided with a fixing member which extends outwardly and upwardly to form a tongue having an outer end which gradually increases in size toward an inner end of the tongue, the tongue being configured so that the outer end of the tongue has same size as the outer end of the recess while the inner end of the tongue has same size as the inner end of the recess thereby enabling the tongue 211 to fit into the recess from the inner end of the recess but not slide out of the outer end of the recess.

Abstract: A dry-pit submersible pump using a totally enclosed fan-cooled (TEFC) electric motor to power the pump. A release mechanism prevents the fan from creating excessive drag when submerged in water. The fan cools the motor when the water level is below the motor, and the surrounding water combines with the fan to cool the motor when the water level rises to at least partially surround the motor. When the fan is at least partially submerged, the release mechanism substantially prevents the fan from imposing a load on the motor due to the surrounding water. The release mechanism can take the form of a shear key, a torque-release clutch or flexible fan blades.

Abstract: An improvement in the structure for mounting blades of a ceiling fan, characterized in that a motor comprising a bottom formed with a plurality of threaded holes, an annular ring-like mounting secured to the bottom of the electric motor by screws and provided with a plurality of brackets each having a groove which gradually decreases in size from an upper portion toward an lower portion thereof, each of the blades provided with a rod having a tongue which gradually decreases in size from an upper end to an lower end thereof, the tongue being configured so that the upper end of the tongue has same size of the upper portion of the groove while the lower end of the tongue has same size of the lower portion of the groove thereby enabling the tongue to fit into the groove but not slide out thereof.

Abstract: In a fan including a hub mounted for rotation and a plurality of fan blades, an attachment assembly for detachably engaging at least one of the plurality of fan blades with the hub, the attachment assembly comprising a stop carried adjacent an end of a selected one of the plurality of fan blades, a socket carried by the hub for receiving the end of the selected one of the plurality of fan blades, and an abutment mounted for movement between a first position to permit the end of the selected one of the plurality of fan blades to admit into the socket, and a normal second position against the stop.

Abstract: A ceiling fan blade for securing to a ceiling fan motor includes a flat root portion and a fan member each having a flange extended from one end and perpendicular to and solidly secured to the root portion and the fan member. The root portion and the fan member are inclined relative to each other for allowing the fan member to be directed toward a relative wind to the ceiling fan blade. The flanges of the fan member and of the root portion of the ceiling fan blade each includes a triangular shape and each includes a longitudinal axis coincident with each other for greatly increasing the strength of the ceiling fan blade.

Abstract: The connecting device includes rotor and blade mounting segments each secured on a rotor and a fan blade at a respective connecting end thereof. A socket end of the rotor mounting segment extends in a radial direction relative to the rotor, and has an insert wall with an insert opening, an insert slot confined by upper and lower inner walls and extending in the radial direction from the insert opening, and an upper outer wall opposite to the upper inner wall. The upper outer wall has a recess communicated with the insert slot to form a retaining wall. A plug end of the blade mounting segment has a bottom wall to be fitted into the insert slot from the insert opening. A resilient retainer has a proximate end secured on the bottom wall, and a distal end with an engaging spring protrusion to provide a biasing force away from the bottom wall.

Abstract: An interchangeable fan blade system for a ceiling fan, made up of a set of adapters having a plurality of elongated attachment apertures that allow the adapter to be threadably fitted to virtually any type of fan support arm, and a complimentary set of interchangeable fan blades. The adapters include one of a variety of connectors for attaching one end of the fan blades to the support arm. The one end of the fan blade is configured and adapted, or otherwise provided with mating connector elements adapted to engage the connectors of the adapters, thereby allowing the fan blades to be removably attached to the adapters. A second embodiment of the interchangeable fan blade system is a set of interchangeable fan blades having a plurality of elongated attachment apertures which allow the fan blades to be secured to virtually any type of fan arm, by threading a plurality of shoulder cap screws and a plurality of male-female connectors though the plurality of attachment apertures.

Abstract: A spacing apparatus for use in mounting an engine cooling fan of a racing vehicle to a drive structure, typically the water pump drive shaft, is made from a spacer body to which a fan hub quick-releasably attaches. The spacer body has a base with a shaft extending therefrom having a reduced perimeter section over which the fan hub mounts. When the fan hub is in place, engagement rods may be inserted in the fan hub to retain the fan hub on the shaft. The engagement rods may be easily and quickly removed without risk of burn to the mechanic to allow quick release of the fan hub on which the fan blades are mounted.

Abstract: A blower wheel assembly and method is characterized by a steel hub with protruding lugs that mate with a corresponding array of holes in a backplate of the assembly. The lugs are riveted or otherwise deformed to upset the lug material, thereby permanently and securely attaching the hub to the backplate. The lugs are formed on the hub by a cold heading process whereby the hub is forcefully impacted by a heading punch or die which has recesses in it corresponding to the shape and configuration of the lugs. The impact causes the hub to deform, with the steel flowing into the recesses of the die, thus forming the lugs.

Abstract: An improved compressor shaft and impeller for an overhung centrifugal compressor are disclosed that enable the hydraulic attachment and release of the impeller and shaft. The shaft and impeller are also keyed together to enhance their torsional load carrying ability. The impeller and shaft have mating tapered turns that provide precision alignment and mating keyed turns axially adjacent to the mating tapered turns that are mechanically coupled, typically by a removable key. The shaft has a hydraulic passageway that connects to the tapered interface between the shaft and the impeller. By providing hydraulic pressure to this passageway, the tapered surfaces can be forced apart to more easily remove the impeller. An annular piston is disposed between the shaft and the impeller that also communicates with the hydraulic passageway. Hydraulic fluid acting on the piston forces the impeller and the shaft apart in an axial direction.

Abstract: A centrifugal pump having a system for preventing unscrewing of the impeller off of the pump shaft is disclosed. The impeller is screwed onto the pump shaft via threads having a first thread pitch, and a lock bolt is inserted through the impeller and screwed into the pump shaft via threads having a second thread pitch. The second thread pitch is greater than the first pitch. Accordingly, if the pump motor is operated in the wrong direction, the impeller is prevented from unscrewing because the impeller attempts to move faster axially than the lock bolt which is holding the impeller on the pump shaft.

Abstract: A safety shroud of a nuclear reactor coolant pump. Capscrew heads, if broken, are prevented from separating from a nuclear reactor coolant pump having a drive shaft, an impeller secured to the drive shaft, a suction deflector secured to the impeller, and capscrews with outer heads securing the impeller and suction deflector to the drive shaft, by securing a safety shroud over the capscrew heads. The safety shroud may be secured by welding the safety shroud to the impeller or suction deflector, or by bolting the safety shroud to the distal end of the drive shaft.

Abstract: An electrically driven air pump having a housing containing a pump unit driven from a shaft of an electric motor, the pump unit including two impellers made of plastic having hubs which are press-fit on the shaft of the electric motor. A collar is also press-fit on the shaft and abutting against the hub of one impeller on a side thereof facing the electric motor, and a lock ring made of metal is press-fit on the shaft and abuts against the hub of the other impeller on a side thereof facing away from the electric motor thereby to clamp the impellers between the collar and the lock ring. The lock ring and the hub of the adjoining impeller are formed at their mutually abutting surfaces with a tooth and groove arrangement to prevent relative rotary movement therebetween. A similar tooth and groove arrangement can be provided between the abutting surfaces of the impellers and between the abutting surfaces of the collar and the adjoining impeller.

Abstract: The turbine comprises a plurality of blades disposed between two end plates and defining flow passages between an inner ring and an outer ring. The turbine is formed by first and second parts, each part made as a single one-piece part out of thermostructural composite material, the first part forming both a first end plate and the blades, while the second part forms the second end plate which is applied against the blades of the first part. The first part and the second part are preferably assembled to each other solely by being clamped together via their central portions.

Abstract: A mounting device is to be secured to a bottom side of a connecting end portion of a fan blade of a ceiling fan. The mounting device includes a decorative member and a mounting arm having a plate-like blade mounting end portion which is to be disposed horizontally beneath the connecting end portion of the fan blade and which is formed with an insert hole that complements the decorative member for retaining the decorative member thereon, and a plurality of screw sockets that are disposed around the insert hole. Screw fasteners extend through the connecting end portion of the fan blade to engage the screw sockets and retain the mounting arm on the fan blade.

Abstract: A fan mounting arrangement of the type comprising a blade assembly incorporated to a tubular central hub (1, 10) fitted into a shaft end (2, 20) of a motor (M), the central hub (10) having at least one engaging projection (11) fitted into a corresponding engaging recess (21) provided at an end portion of the shaft end (20), in order to mount the central hub (10) to said shaft end (20) restraining said parts from relative movements, the fitting being obtained by the elastic deformation of part of the lateral wall of said central hub (10).

Abstract: A structure and method for transferring load, particularly bending load, from a blade to a blade hub, such as for use in a wind turbine device, is provided. In one embodiment, the structure includes two or more spaced-apart annular rings, respectively contacting the inner surface of a blade root end, and the outer surface of a hub spindle, with a web extending therebetween.

Abstract: The invention provides a more durable composite fan assembly with a metal hub including a portion adapted for rotation and for engagement with a plastic body and including at least one peripheral portion offset from its plane of rotation, and a plastic body forming a plurality of air-moving blades molded in engagement with the offset peripheral portion of the metal hub. The offset peripheral portion of the metal hub can comprise a number of configurations, for example, it can comprise one or more annular portions formed adjacent the periphery of the hub, including but not limited to, a complete annulus offset from the plane of rotation of the hub periphery. The offset peripheral portion can also comprise one or more portions at the periphery of the metal hub, which are out of the plane of rotation, preferably so that at least two offset portions extend out of the plane of rotation at an acute angle of about 10.degree. to 30.degree. on one or both sides of their plane of rotation.

Abstract: This compressor is provided with a compressor impeller (1) which has a hub (2) of plastic fitted with moving blades (5), with a shaft which is connected to the hub (2) and extends along an axis (4), and with a housing which surrounds the compressor impeller (1).It is intended to provide a compressor which has a compressor impeller produced from a plastic and is nevertheless suitable for comparatively high operating temperatures. This is achieved by the hub (2) of the compressor impeller (1) being produced from a thermoplastic reinforced with continuous fibers, and by the moving blades (5, 20) being prefabricated separately from a thermoplastic reinforced with continuous fibers and connected with a form fit to the hub (2).

Abstract: A fan assembly has a circular disc with a rotational axis and first and second sides. A cylindrical side wall extends around the periphery of the disc. The side wall has axially spaced first and second rims and is circumferentially subdivided into a plurality of wall segments, each wall segment has inner and outer surfaces, with the second rim of the wall protruding axially beyond the second side of the disc. Fan blades are carried on the outer surfaces of the side wall segments. Mounting members protrude from the first side of the disc at locations spaced circumferentially around the periphery thereof. Connecting members on the inner surfaces of the wall segments coact in separable interlocked engagement with the mounting members to fasten the wall segments to the disc. A first ring on the first side of the disc prevents the connecting members from separating from their interlocked engagement with the mounting members. A second ring on the second side of the disc interconnects the wall segments.

Abstract: A propeller has a hub affixed to a propeller shaft so as to rotate therewith. The hub is axially locked by a locking arrangement consisting of a lock nut screwed on to the shaft and a lock screw screwed into the end of the shaft to lock the nut. The screw is tightened more than the nut in order to cause the thread on the nut to load the opposite thread flank on the shaft. A portion of the nut which is deformed during tightening of the screw holds the nut and screw together during subsequent removal of the propeller.

Abstract: A marine drive having a drive sleeve and a drive sleeve adapter between the propeller shaft and the propeller hub where the drive sleeve absorbs the shock of the propeller striking an object by torsionally twisting a forward end of the drive sleeve which is keyed to the propeller hub and where the adapter is keyed to the propeller shaft and the drive sleeve is keyed to the adapter. The combination provides both high load capability and shock protection.

Abstract: A device for connecting blades (7) to a hub (5) in a propeller of either a fan or an aircraft has a variable fitting in at least a moving position. An L-shaped element (1) connects each blade (7) to the hub (5) so that an attachment of the blade (7) to the hub (5) has a longitudinal axis eccentric with respect to a longitudinal axis of the hub (5). The L-shaped element (1) has a first long leg aligned parallel with a longitudinal axis of the blade (7). The L-shaped element (1) also has a short leg perpendicular to a flat plane of the blade (7) and parallel to a rotational axis of the hub (5). A screw (4) fastens the second short leg of the L-shaped element (1) to the hub (5). This screw (4) is aligned parallel to the flat plane of the blade (7) but has a longitudinal axis spaced from the flat plane of the blade (7). A circular crown (6) presses the L-shaped element (1) to the hub (5) while a hole (3) retains the screw (4) whereby the hole (3) is eccentric with respect to the crown (6).

Abstract: A ceiling fan blade support comprises a fastening segment and blade support segment. The fastening segment is fastened to a main body of the ceiling fan and provided at one end thereof with a vertical surface having a pivoting cut. The blade support body is provided at one end thereof with a protruded piece engageable with the pivoting cut of the fastening segment. The protruded piece has a pivoting botom side provided with a slanted surface having an angle of inclination ranging between 10 and 15 degrees. In operation, the ceiling fan blades are so balanced as to eliminate the excessive vibration of the ceiling fan.

Abstract: A fan and fan drive assembly (11) is disclosed of the type including a fan drive (13) and a fan assembly (15). The fan drive (13) includes a body member (21) and a cover member (23), one of the members comprising a die-cast member and including a connecting portion (65; 165; 201) having a terminal portion (67, 69; 102; 267, 269). The fan (15) comprises a one-piece molded plastic member, and during the molding step, whichever of the body and cover defines the connecting portion is disposed within the molding die (M). The terminal portion of the connecting portion is disposed within a hub cavity (H), so that, when the moldable plastic material is injected into the hub cavity, it forms the fan hub (61) about, and rigidly connected to the terminal portion of the connecting portion.

Abstract: A variable pitch propeller blade system includes a conductive clevis attached to a rotor, a mating non-conductive clevis fastened to a non-conductive propeller blade, a pin journaling through bores in each clevis, joining the clevises to form a hinge joint, and a conductive path along a substantial part of the propeller blade.

Abstract: A ceiling fan having a plurality of blade irons removably attached to a rotor. Each blade iron includes an arcuate web with a first flange for attachment to the rotor. A second flange is included for receiving a fan blade. The trailing edge of each blade iron overlaps the leading edge of the next successive blade iron.

Abstract: A high solidity impeller has a number of equally spaced blades, each formed from a sheet that is bent to a continuous cylindrical curve along a roll axis that lags (in the rotation direction) the radius at which the blade is attached to the shaft. The blade also is pitched by rotation around the radius, i.e., the leading edge is raised in the flow direction and the trailing edge is lowered. The roll axis preferably lags the radius by 45.degree.. This arrangement provides a good approximation of a true hydrofoil and results in an excellent reconciliation between interests of material and manufacturing cost vs. pumping efficiency. The blades can be formed by rolling asymmetrically shaped contours cut from a flat sheet. A base member and preferably a connecting arm couple each blade to the shaft. The base member abuts the rolled contour along surfaces referenced to the roll axis, which surfaces can be used as a reference for rolling.

Abstract: In a marine drive (10), a drive sleeve (50) between the propeller shaft (22) and the propeller hub (34) absorbs shock after the propeller (12) strikes an object by torsionally twisting between a forward end keyed to the propeller hub and a rearward end keyed to the propeller shaft. The drive sleeve is composed of a plastic material providing torsional twisting angular rotation at a first spring rate less than 100 lb. ft. per degree from 0.degree. to 5.degree. rotation, a second higher spring rate beyond 5.degree. rotation, and supporting over 1,000 lb. ft. torque before failure.

Abstract: A wind power plant for harnessing wind power includes a tower; a plurality of upright rotor blades spaced apart circumferentially and spaced radially from a rotational axis; and a supporting structure for the rotor blades leading from the tower to the rotor blades.

Abstract: Movement of a fluid such as air is produced by rotating about a rotational axis a plurality of flow generating plates arranged in parallel with clearances therebetween. The clearances between adjacent flow generating plates for producing the movement of the fluid most effectively only by an adhesion of the fluid to the flow generating plates are set to be twice a value of a distance of an intermediate portion between the surface of the flow generating plate contacting a portion of the fluid in a close boundary layer which is rotated and moved substantially together with the flow generating plate and a remote fluid boundary layer which is substantially not influenced by centrifugal force due to the rotation of the flow generating plate. In the case of air, the clearances are about 0.5 mm. It is preferred to form the flow generating plate so as to have a waved surface for improving the flow generating efficiency.

Abstract: A coupling fan includes a fan body, a coupling and a mounting plate. The mounting plate includes a substantially ring-shaped base member and a substantially strip-shaped movable member having spring elasticity. The base member is connected to a boss of the fan body or an operating member of the coupling. The movable member is connected to the base member at its one end, and it is further connected to the boss of the fan body or the operating member of the coupling, to which the base member is not connected, at its another end. With this construction, not only vibrations of the fan body and the coupling are absorbed by the movable member, but also an overall inside diameter of the mounting plate can be made greater. Namely, a coupling having a larger outside diameter can be employed, and accordingly the cooling efficiency of the coupling can be improved. Hence, the coupling fan can be improved in its durability.

Abstract: A rotor assembly for a screw pump has a light alloy rotor main body having an axially extending central bore. A steel shaft is press-fitted into the central bore. A diametrically extending fixing pin is press-fitted through the rotor main body and the shaft. Friction forces between the rotor main body and the shaft are arranged to be larger on a discharge side of the rotor assembly than on a suction side thereof. The fixing pin is disposed at substantially a central position of entire friction forces in terms of their directions and magnitudes.

Abstract: An integrated spline/cone seat subassembly for a rotor assembly that is design optimized to minimize the radial dimensions of the rotor shafts, the rotor shaft bearings, the transmission housing, and the swashplate subassemblies thereof. The integrated subassembly includes a rotor hub having a shaft aperture with a plurality of hub splines extend radially inwardly therefrom. The lower portion of each hub spline has an outwardly tapered portion that makes a predetermined angle with respect to the hub centerline. The integrated subassembly further includes a rotor shaft having a primary shaft portion of a first diameter, an end shaft portion having an intermediate second diameter less than the first diameter, and a conic transition portion that makes a predetermined angle with respect to the rotor shaft axis. The end shaft portion has a plurality of shaft splines extending radially outwardly therefrom that defines a third diameter that is equal to the first diameter.

Abstract: A fan is contained within a case having a pivotal upper portion and a lower portion whereby opening the upper portion raises the fan blade and motor assembly to an operating position and during which a limit switch is automatically actuated to operate the fan motor. The fan blade is also provided with a frictional engagement with the motor shaft for permitting the motor shaft to rotate relative to the fan blade when the latter strikes an obstruction.

Abstract: A first hollow titanium MMC driveshaft portion is diffusion bonded to a third portion which in turn is fastened to a second superalloy portion via circumferentially positioned pins which are tightly fitted within aligned holed formed in the second and third driveshaft portions. The first, second and third portions are concentric with respect to the driveshaft centerline, and the pins are retained by means of a concentric retaining cylinder.

Abstract: A coupling fan includes a fan body, a coupling and a mounting plate. The mounting plate includes a substantially ring-shaped base member and a substantially strip-shaped movable member having spring elasticity. The base member is connected to a boss of the fan body or an operating member of the coupling. The movable member is connected to the base member at its one end, and it is further connected to the boss of the fan body or the operating member of the coupling, to which the base member is not connected, at its another end. With this construction, not only vibrations of the fan body and the coupling are absorbed by the movable member, but also an overall inside diameter of the mounting plate can be made greater. Namely, a coupling having a larger outside diameter can be employed, and accordingly the cooling efficiency of the coupling can be improved. Hence, the coupling fan can be improved in its durability.

Abstract: A centrifugal fan assembly consisting of a number of centrifugal fan units. Each of the centrifugal fan units comprises (a) an annular member with a first side and a second side, (b) a number of blades integrating with and extending from said first side, (c) a number of grooves formed in said second side of said annular member, (d) a first device for guiding said blades formed on one centrifugal fan unit to enter in said grooves formed in another centrifugal fan unit even if there is a slight circumferential misalignment of said blades formed on one centrifugal fan unit between said grooves formed in another centrifugal fan unit and (e) a second device for guiding said blades formed on one centrifugal fan unit to enter in said grooves formed in another centrifugal fan unit even if there is a slight radial misalignment of said blades formed on one centrifugal fan unit between said grooves formed in another centrifugal fan unit.

Abstract: A main rotor head is disclosed, which is adapted for mounting on a main rotor mast of a helicopter. A main rotor mast nut is threaded onto the main rotor mast in order to fasten the main rotor head to the mast. The key feature of the invention is a nut retention means, which comprises a cup-shaped round annular disk and closely surrounds the nut, preventing separation of the main rotor head from the main rotor mast should the nut fail during flight.

Abstract: A shock absorbing drive sleeve (50) is provided by a molded plastic member directly mounting the propeller hub (14) to the propeller shaft (22). The sleeve has a rearward inner diameter portion (52) engaging the propeller shaft in splined relation, and a forward inner diameter portion (56) spaced radially outwardly of and disengaged from the propeller shaft. The drive sleeve has a rearward outer diameter portion (58), and a forward outer diameter portion (60) engaging the propeller hub. The drive sleeve and the propeller hub are tapered relative to each other such that a forward outer diameter portion (60) of the drive sleeve snugly engages the propeller hub, and a rearward outer diameter portion (58) is spaced slightly radially inwardly of the hub by a small gap (62) and may partially rotate relative to the propeller hub in response to rotation of the propeller shaft drivingly engaging the rearward inner diameter portion.

Abstract: A method for balancing the rotor of a wind turbine and a balancing weight. The weight is formed of a piece of steel or other material of sufficient weight bent in an L shape with holes that allow it to be bolted onto a flange at the root of the wind turbine's blades. The width, thickness, or length of the weight can be varied to produce balancing weights of unique weight and radius from the rotor's axis of rotation. A trial weight is disclosed for use with the so-called four run method of determining the rotor's unbalance. The trial weight can be quickly and easily attached and removed.

Abstract: A household appliance (D) has a housing (H). A fan (A) located inside the housing circulates air through the appliance. The fan is attached to a motor (M) located outside the housing. The motor has a shaft (S) extending through an opening (O) in a sidewall (W) of the housing and the fan is connected to the inner end of the shaft. A hub ring (9) is used for mounting the motor to the housing and includes a flange (13) having tabs (17) which engage a hub U of the motor to interlock the motor/fan assembly with the hub ring. The housing has a projection (3) on the outside of the housing through which the shaft extends and the hub ring has a sleeve 11 received in the projection to align and support the motor/fan assembly.

Abstract: A laminar flow fan is described comprising a number of fan elements, such as disks, carried on support posts. In a preferred embodiment, each element has a non-circular central aperture. The shape of the aperture provides sufficient clearance for the elements to be placed over the support posts in a first position. Rotation of the elements into a second position with respect to the support posts latches the elements into engagement with the posts, thereby maintaining the elements in this second position.

Abstract: A mounting bracket for a ceiling fan blade is cut into two separate pieces that are pivotally interconnected to one another so that the blade is pivotal in either of two directions about the pin. A lock ring is positioned radially outwardly of the pivot point to lock the blade into its operable position. Rotation of the lock ring until a slot formed in the lock ring is in alignment with the mounting bracket neck frees the mounting bracket to pivot downwardly, facilitating cleaning of the blade. In a second embodiment, a mounting bracket releasably couples together inward and outward parts of the mounting bracket so that the fan blade is completely detachable from the motor assembly to facilitate cleaning of the blade. In a third embodiment, a bag having cleaning pads at its mouth is used to clean either the pivotally mounted blade or the releasably coupled blade.

Abstract: An aircraft propeller system of the unducted fan type includes a plurality of propeller blades which are respectively fastened to a rotor, rotate about an axis of rotation and also rotate about a pitch axis. Each blade is fastened to the rotor by a hinge which has a pivot axis to reduce the effective stiffness of each blade, the pivot axis being non-parallel to the axis of rotation.

Abstract: An improved centrifugal fan in which a fan blade is supported by a main plate and a side plate and said main plate is connected to a rotation shaft, characterized in that between the rotation shaft and the main plate, there is interposed a doughnut-shaped connecting plate penetrated by the rotation shaft at the central part thereof, the connecting plate is fixed to the rotation shaft and to the main plate, at the inner and outer circumferential parts of the connecting plate, respectively, a plurality of through holes are provided in the inner and outer circumferential parts of the connecting plate in the circumferential directions, respectively, and slits are formed between each pair of two opposite through holes positioned obliquely with respect to the direction of radius of the connecting plate. Non-reversible displacement of the center of the fan blade is avoided which is a major factor in the vibration of the fan blade.

Abstract: A dual alloy disk made from a rim alloy having high stress rupture and creep resistance as well as good hold time fatigue crack resistance and a hub alloy having high tensile strength and good low cycle fatigue crack resistance is described. The dual alloy disk is designed for use as a disk in gas turbine engines operating as high as 1500.degree. F. The hub and rim are joined together at a substantially defect-free joint to form a turbine disk having improved properties in both the hub and rim regions.

Abstract: The invention relates to pitch-change systems in aircraft propellers. The invention includes redundant planetary gear systems, each of which can independently change pitch if the other fails. The invention also includes a system for reducing displacement of the planets, which can occur during a failure.

Abstract: An aspirator fan is disclosed, which comprises a rotating shaft press-fitted in an impeller, a support member having an urging means and receiving one end of the rotating shaft for supporting the rotating shaft as a cantilever, and a shaft abutment member disposed in a casing and having a shaft abutment portion against which the opposite end of the rotating shaft is urged by the force of the resilient means. The aspirator fan is free of an alignment adjustment between the rotating shaft and bearings which is required in the casing of conventional aspirator fans. The shaft abutment member is structurally separated from the casing, so that even when the casing is deformed, a deformation of the casing has no effect on the rotation of the rotating shaft. The aspirator fan can, therefore, be operable with an improved reliability.

Abstract: A disposable pump assembly adapted to be driven by a motor through an elongated shaft. The disposable pump assembly includes a pump body having a volute portion and an elongated riser portion extending upwardly from the volute portion. The riser portion is integrally joined to the volute portion by a neck defining a restricted opening leading from the riser portion to the volute portion. The elongated shaft is adapted to be inserted into the riser portion, through the restricted and into the volute portion of the pump body. The disposable pump assembly also includes a shaft-receiving impeller disposed in the volute portion of the pump body for driven movement by the motor. The impeller and the elongated shaft each have correspondingly shaped portions for interconnecting and driving the impeller upon insertion of the shaft through the riser portion and into the volute portion of the pump body.