Abstract: For a bearing mounted between two concentric races rotating relative to each other, and forming an annular gap that accommodates the bearing and is closed by seals, at least one grease tube is provided between the periphery of one of the two races and the annular gap, and is connected to a corresponding grease reservoir. At least one main grease tube opens into the annular gap in an angular sector where an overpressure occurs, a corresponding main grease reservoir is adapted to collect grease flowing from the annular gap through the main grease tube due to the overpressure that may occur within the annular gap in the angular sector.

Abstract: A personal fan has a stable mounting base with a bottom surface adapted to lie against the chest of a wearer and a top surface. The stable mounting base is in the form of a weighted shallow robust body having a length and breadth substantially greater than its thicknes. A tiltable shroudless fan unit is mounted on the top surface. A control for the fan is located on the body. A cord is attachable to the body to permit the body to be suspended around the neck of the wearer such that the bottom surface lies snugly against the wearer's chest and the shroudless fan unit can be oriented to direct airflow onto the user's face and the control is accessible to the user.

Abstract: A wind driven power generator is designed for mobile applications and locates the generator in a power housing at the base of the unit on an adjustable mounting arrangement. A lightweight high strength hollow column is supported in the power housing and supports a wind driven turbine at the opposite end of the column. A drive shaft within the column transfers power from the turbine to the generator and causes rotation thereof. Preferably the column provides the only support of the turbine and the column is not supported by guide wires.

Abstract: Apparatus for conveying air to radiators of motor vehicles and the like having a fan (10) having a plurality of blades (12) each radially mounted its own coupling device (31) on a central body (11) and able to be rotationally actuated about its longitudinal axis by an actuator (41,42,43) depending on the quantity of air required for correct cooling of the fluid, the apparatus has a device (60,160,260,360,460) for engaging/disengaging the transmission of the rotational movement from the drive (23,21;321a,21;421a, 21) generating movement to the fan (10).

Abstract: A blade spreading assembly for quick ceiling fan installation is disclosed. The blade spreadingassembly comprises a fan rotor bracket attached to the fan rotor and operatively coupled to an arm which connects to fan blade. The assembly allows the attached fan blade to collapse for storage and shipment and spread for operation. Since the blades are pre-attached by the manufacturer, the user is only required to unpack the ceiling fan from the shipment box and hang the fan up at a desired location and have the fan blades spread out with a simple single push. The fan blades can likewise be collapsed for storage with relative ease.

Abstract: The mounting of an adjustable rotor blade on the rotor hub of a wind power installation has as an adjusting drive pivot bearing, a rolling bearing for the transmission of high axial forces and great flexural moments in the event of slight relative movements between the co-operating bearing components. It comprises a bearing race for the one co-operating bearing component, which receives in positively locking relationship two radially mutually displaced rows of rolling bodies, and a bearing race for the other co-operating bearing component, which embraces them in a U-shape in cross-section. The bearing race for the rotor blade forming the other co-operating bearing component comprises two races (10, 12) of different diameters, which are fixed independently of each other to the rotor blade (3). The circular root of the hollow rotor blade (3) is forked to form two shell portions (3a, 3b) and each shell portion is fixed to one of the two races (10, 12) of the one bearing race.

Abstract: The present invention is a space saving home comfort device comprising a housing and an air generator. A support member has a predetermined length and a base member has a maximum width dimension BB. A predetermined rise height R provides support and elevation to the housing. The housing is either fixedly or rotatably coupled to an end of the support member and comprises at least one wall having a predetermined length L and a maximum cross-sectional width D taken along a horizontal plane, at least one inlet opening formed in the at least one wall, at least one outlet opening formed in the at least one wall, and an air generator positioned between the at least one inlet opening and the at least one outlet opening. The air generator provides exhaust air to the at least one outlet opening.

Abstract: A propeller or fan, in particular a cooling fan, such as for the radiator of a motor vehicle or electric equipment, for civil or industrial plants, comprising shape-memory actuator means to regulate the direction and/or shape of the blades, for example according to variations in temperature.

Abstract: An article, such as an impeller, is mounted for torque transmission by a shaft by positioning the article in contact with a threaded collar engaging tapered threads on the shaft and applying an axial force to the article to move and tighten the threaded collar on the tapered threads. The axial force is applied to the article by a clamping collar which contacts the article only in an area spaced from a central bore of the article in order to deflect a portion of the article defining the central bore radially inward toward the shaft. In one embodiment, two impellers are positioned back-to-back, with one impeller receiving an axial force spaced radially from a central bore of the impeller by an annular formation on the other impeller.

Abstract: An adjustable and stable pre-loading device equipped fan includes a stator, a first rigid spacer, a first bearing, an elastic device, a second bearing, a second rigid spacer, a rotor and a shaft. Among these, the stator includes a receptacle. The first bearing is formed on the first rigid spacer in the receptacle. The elastic device is formed in the receptacle and further on the first bearing. The second rigid spacer is formed on the second bearing on the elastic device. The rotor is coupled to the stator and has a blade structure. The first rigid spacer compresses the elastic device by means of the first bearing. The second rigid spacer compresses the elastic device by means of the second bearing. The distance between the first rigid spacer and the second rigid spacer is adjustable, thereby altering pre-loading applied on the first bearing and the second bearing.

Abstract: A fan having stable pre-loading device includes a stator, at least one bearing, a rotor having a blade structure, a shaft and a rigid spacer. Among these, the bearing is formed in the space of the stator. One terminal of the shaft is coupled to the stator. The elastic device is formed on the bearing. The rigid spacer is formed on and thus compresses the elastic device. Another terminal of the shaft passing the rigid spacer as well as the elastic device is coupled to the inner ring of the bearing.

Abstract: A fan having stable pre-loading device includes a stator, at least one bearing, a rotor having a blade structure, a shift and a rigid spacer. Among these, the bearing is formed in the space of the stator. One terminal of the shaft is coupled to the stator. The elastic device is formed on the bearing. The rigid spacer is formed on and thus compresses the elastic device. Another terminal of the shaft passing the rigid spacer as well as the elastic device is coupled to the inner ring of the bearing.

Abstract: A boat propeller comprises a hub formed of a front cylindrical member and a rear cylindrical member. The hub is provided in the joining place with a plurality of receiving cavities which are arranged equiangularly and circularly. Each cavity is provided removably with an angle setting member which is joined with the hub. A plurality of blades are joined with the outer periphery of the hub such that the inner ends of the blades are inserted into the cavities and are located by the angle setting members. Under the circumstance that the shapes of the hub and the blades remain unchanged, the blade pitch in relation to the hub can be changed by the angle setting members of various shapes.

Abstract: In one embodiment, the present invention provides a high performance molded, substantially non-metallic fan capable of producing at least about 20 cubic feet per minute (“CFM”) per input watt at a static pressure of about 0.00 inches of water. In one embodiment, the fan combines a substantially non-metallic housing, an airfoil cross-sectional fan blade, and a non-metallic hub. The fan blades may be detachable from the hub and rotationally indexable to a variety of pitch angles. Further, the hub and fan blades may include alignment indicia, so that the fan blades can be adjusted to a commensurate pitch relative of other fan blades around the hub.

Abstract: An apparatus for mounting ceiling fan blades onto ceiling fan blade mounting ring rotor extension. The fan blade attachment mount is can be adapted to fit a multitude of fan rotors configurations. The appearance of the mounting and support members is aesthetically pleasing and the mounting apparatus provides a stable connection between a plurality of ceiling fan blade assemblies and a variety rotor extension mounting surfaces of a ceiling fan.

Abstract: A blade bracket mounting system for a ceiling fan includes a support base having a plurality of locking portions each having three locking slots each having a first end defining a wide portion and a second end defining a narrow portion, a plurality of blade brackets each provided with a connection secured on the locking portion of the support base, and provided with three slide blocks each slidably mounted in the locking slot of the locking portion, three locking screws each screwed in the slide block and each slidably rested on the wall of the locking slot, and a fastening ring mounted on the support base and provided with a plurality of limit lugs. Two adjacent limit lugs each have a corner secured in the cavity of the connection of the blade bracket so that the blade bracket is rigidly secured on the support base.

Abstract: A variable-pitch boat propeller has a hub rotatable about a hub axis, a plurality of vanes rotatable on the hub and extending generally radially of the hub axis, and an adjustment element rotatable on the hub about the hub axis and connected to the vanes for pivoting the vanes on the hub. An adjustment knob is pivotal on the hub about the hub axis and interengaging formations on the knob and hub limit angular displacement of the knob on the hub between a pair of end positions so that a limited range of adjustment of the vanes is possible with the knob. The interengaging formations include an axially open groove having a pair of ends constituting abutments and an axially projecting screw head and rotationally fixed relative to the hub and received in the groove. The groove is formed in the knob and the screw head is carried on a yoke rotationally coupled to the hub. The groove is arcuate, centered on the hub axis, and has an arc length of substantially less than 360°.

Abstract: A new and improved fan is disclosed which can be operated by a remote control. The concept of the present invention can be applied to any design fan, either a table top or floor fan, and would provide features such as tilt, level, pause and sleep remote functions. The remote control itself could come in a wide variety of designs.

Abstract: Quick attachable and detachable mounting arms for ceiling fans. A first version has flat headed fasteners initially attached to one end of mounting arms, with key-hole slots in the endshield of the ceiling fan motor. The user raises the mounting arm so that the flat headed fasteners fits through the larger openings in the keyhole slots and then pulls the mounting arm outward until the arm locks in place by the smaller opening portions of the keyhole slots. Rubber type gaskets and washers help lock and hold the mounting arms in place. The flat headed fasteners can also be located on the endshields with the keyhole slots on mounting arms. A second embodiment includes inwardly deformable springably snapable fasteners that can be located on the ends of the mounting arms which can deform inwardly and expand after passing through slots on the endshield of the rotor. Alternatively, the fasteners can be located on the bottom of the endshield with the receiving slots on the ends of the mounting arms.

Abstract: A marine propeller includes a hub defining an axial direction of the propeller, a plurality of adjustable propeller blades disposed around the hub, and a blade setting adjusting arrangement. Each blade includes a blade-part and a root-part, the root-part being mounted in the hub and being turnable about an axis that defines an angle with the axial direction of the propeller.

Abstract: A ceiling fan bracket has a first end connected to a ceiling fan blade and a second end of the ceiling fan bracket has two L-shaped wings. A connector is connected to the second end of the ceiling fan bracket and has two tongues. A motor casing has a plurality of L-shaped holes and each L-shaped hole includes a wide portion located close to a center of the motor casing and a narrow portion located close to a periphery of the motor casing. Each wing is engaged with the narrow portion of the L-shaped hole and each tongue is engaged with the wide portion of the L-shaped hole. The eccentric force applied to the ceiling fan bracket secures the ceiling fan bracket to the L-shaped hole in the motor casing.

Abstract: A bearing arrangement, for example, for a variable pitch propeller, has a fluid operated actuator (42, 34, 40) for causing relative movement between bearing surfaces of races (12, 32) so as to preload bearings (30) held there between. Mechanical locking means (34, 36, 38) is provided to maintain the bearings under preload when the fluid pressure is released from the actuator.

Abstract: A composite propeller blade and hub attachment assembly is disclosed. The assembly includes a blade root having a first connecting member and a hub arm having a second connecting member. The first connecting member meshingly engages the second connecting member. A device preloads the blade root and the hub arm. The first and second connecting members form a slot for receiving the preloading device. The preloading device includes an outer movable unit, an inner movable unit, and a mechanism for displacing the outer and inner movable units relative each other. As the mechanism for displacing relatively moves the inner and outer units, the preloading device is caused to expand and tension the blade root and hub arm for mechanically preloading the blade, in a manner which increases the low centrifugal load off lightweight composite blades.

Abstract: A fan impeller assembly of simple construction which is intended, in particular, for use in cooling systems of internal combustion engines and can be used there inter alia as a cleaning blower for clearing the radiator and/or corresponding air inlet openings by reversal of the direction of delivery.

Abstract: The sealing ring seals between relatively rotating and vibrating machine parts such as parts of an aircraft propeller, and has several sealing lands. The shape and configuration of the lands are selected so that natural vibration frequencies of the ring or lands are not vibration frequencies to which the ring is subject in use.

Abstract: An actuation system which includes apparatus for transferring control signals for varying the blade pitch from a non-rotating member to a rotating member of a gas turbine engine is described. In one embodiment, the engine includes a main disk containing a row of blades, and the disk is coupled to a main shaft which rotates about the engine axis. An actuating disk, or cone, rotates with the main disk, and the torque required to rotate the actuating cone is transmitted through ball splines attached to the main shaft. The ball splines allow transmission of torque between the disk and the cone and at the same time enable the disk and the cone to move axially relative to each other without binding. The actuating cone is supported at one end by the ball splines and at its other end by ball thrust bearings. The ball thrust bearings are pre-loaded to enable the bearings to withstand axial loads in opposite directions.

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: The present invention is directed to the general field of ceiling fans and more particularly to the field of ceiling fans with easy install features. Such a fan includes an electrical quick connect device and an articulating fan blade assembly. The quick connect device includes a plug/receptacle configuration enabling the fan to easily connect to an electricity supply while providing the gravitational and rotational support required by the fan. The fan blade assembly includes a drive hub having a series of slots to receive the neck of a fan blade. The fan blade neck is secured in the slot in a fashion that allows for articulation of the blade relative to the fan or removal of the fan blade from the fan.

Abstract: A fan blade mounting system for large air-moving fans includes a radially extending hub strut, a blade root member pivotally coupled to an end of the hub strut for receiving a blade skin, and a tube end located between the blade root member and the hub strut. A pair of resilient mounts are utilized in the blade root member to effectively pivotally couple the blades to the hub, thus relieving most of the vertical bending moment transferred to the hub and eliminating critical frequencies associated with the fan. The hub strut is connected to the hub of the fan by a stud having right- and left-handed threads and a wall thickness adjacent to the threads sufficient for distributing the stresses substantially uniformly on the threads, thereby improving fatigue resistance. The resilient mounts comprise a metal core and metal sleeve with a resilient elastomeric layer between the core and sleeve. The sleeves are connected to the blade root member and the cores of the two mounts are clamped to the tube end.

Abstract: A propeller blade retention assembly for use with a propeller having a hub rotatable about a propeller axis, is disclosed. The assembly includes a blade receiver for mounting the blade to the hub and an internal surface of a hub arm for interfacing the receiver with the hub. The receiver is positioned in the hub arm and is non-integral with the blade and the hub arm internal surface. A retention mechanism is used for retaining the blade receiver to the hub arm while allowing relative rotatable motion therebetween. A preload device is provided for preloading the retention mechanism prior to centrifugal loading during propeller blade operation. The blade is separable from the blade receiver without disturbing the operability of the retention mechanism.

Abstract: A blade retention system which allows a blade to be rotated about a blade stack axis by utilizing a cover, an anti-rotational key, and strap is described. The substantially cylindrical cover rotatably couples to a rotor disk opening using a thrust bearing. The cover includes a dovetail-load slot for receiving a rotor blade dovetail key. The anti-rotation key is positioned between the dovetail key and the dovetail-load slot to secured the blade to the cover. The strap holds the key in place and is clamped between the cover and the control mechanism.

Abstract: An adjustable propeller is provided with a receptacle on its hub which is shaped to receive a base portion of a propeller blade. First and second pluralities of alignment devices are provided to allow an operator to select a desired pitch angle and attach the blades of the propeller to the hub so that the desired pitch angle is selected. Alignment devices can comprise a plurality of holes in each receptacle which are tapped to receive a bolt in threaded association therein. Associated holes in the base portion of the propeller can allow free passage of the bolt by selecting one of the holes in the base portion of the propeller and aligning that hole with an associated hole in the receptacle of the hub, an operator can quickly and easily select a desired pitch angle for the blade. A bolt passes through a hole in the base portion of the blade and threads into an associated hole in the propeller hub to select the pitch and attach the base portion to the hub.

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: A ceiling fan has a downrod assembly secured at an upper end to a ceiling bracket assembly and secured at a lower end to the motor shaft of a motor. An upper canopy is disposed at an upper end of the downrod assembly and a lower canopy is disposed at the lower end of the downrod assembly. A fan housing/blade mounting assembly secures fan blades to a motor body that rotates about the motor shaft, and a lower platter assembly is secured to a lower end of the motor shaft.

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 device for connecting brackets and a motor of a ceiling fan includes a ring element fixedly connected to an underside of the motor and having a plurality of protrusions extending from an underside of the ring element. Each of the protrusions has an inclined surface defined in a free end thereof and each of the inclined surfaces has a plurality of first threaded holes defined therein. At least one bracket has a first end with an enlarged plate to connect to a blade and a second end having an engaging element which has at least two first holes defined therethrough so as to be fixedly connected to one of the inclined surface by extending bolts through the first holes and engaging with the first threaded holes of the protrusion.

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: A marine propeller includes a series of releasably affixed blades which allow pitch adjustment. The blades are each secured to different blade disks which are positioned in hub wells and held by positioning pins. The method describes how the blades, which are each attached to blade disks at preselected positions can be released, rotated and reaffixed. The disk can then be rotated in the opposite direction on the hub in a smaller increment, to provide more or less pitch as needed.

Abstract: A form having a base, a tip, and a major surface, an adhesive layer carried on the major surface and a protective sheet removably covering the adhesive layer, forming a decoratable fan blade removably mountable on a ceiling fan.

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 turbine blade having a preestablished rate of thermal expansion is attached to a turbine disc having a preestablished rate of thermal expansion being greater than the preestablished rate of thermal expansion of the turbine blade and forms a turbine assembly. The turbine blade has a root portion defining a pair of sides having a pair of grooves therein. The turbine assembly includes a pair of flanges between which the turbine blades are positioned. Each of the pair of flanges has a plurality of grooves defined therein. The grooves within the pair of flanges are aligned with the grooves in the blades and have a space formed therebetween. A plurality of spherical balls are positioned within the space. The plurality of spherical balls has a preestablished rate of thermal expansion being equal to the preestablished rate of thermal expansion of the turbine blade.

Abstract: A propeller comprises a hub (1) rotatable about a propeller axis and formed with a hub barrel (1) with a central hub axis that extends radially of the propeller axis, a blade (9) having a support assembly (3) at its inner end received within the hub barrel (1) and including at least one bearing (11,16) that supports the blade (9) for rotation about the hub axis, a locking recess (7,25,33) formed at least in part in the support assembly (3) and at least in part in the hub barrel (1) and a key element (26) located within the locking recess (7,25,33) to restrain radial outwards movement of the blade (9) along the hub axis. The key element (26) is insertable into and retractable from the locking recess (7,25,33) while the inner end of the blade (9) is assembled in the hub barrel (1). The locking recess (7,25,33) extends circumferentially within the hub barrel (1), and the key element (26) is flexible to follow the recess when inserted.

Abstract: The vessel of a mixing device accommodates a mixing tool having suitable blades fixed to a hub. A rotary drive shaft extends into the vessel and is coupled to the hub in such manner as to rotate the tool while enabling the tool selectively to be displaced axially on the shaft between an operative position in which the blades are in close proximity to the base wall of the vessel, and an inoperative position in which the blades are spaced sufficiently from the base wall to provide access for cleaning. Axial displacement of the tool is controlled through external actuation of a threaded lifting device provided within the hub and acting between the hub and shaft.

Abstract: Setting pitch on a windmill airfoil having a longitudinal axis, a rotor blade and a rotor base secured to the rotor blade is accomplished by marking a windmill rotor hub for receiving the rotor base with a reference mark at a location corresponding to a first plane parallel to a plane of rotation of the windmill airfoil in use. The airfoil is positioned along a second plane relative to and substantially completely intersecting the longitudinal axis of the airfoil. The rotor base is marked at a location substantially parallel to the second plane. The airfoil is positioned relative to the windmill rotor hub so that the rotor base is in substantial engagement with the hub. The airfoil is moved relative to the hub so that the mark on the rotor base is aligned with the reference mark on the windmill rotor hub and the rotor base is secured to the windmill hub. An apparatus for marking pitch on a windmill airfoil is also provided.

Abstract: A stirring system for stirring contents in a laboratory flask having a round or spherical bottom and a reduced neck includes a stirrer shaft manufactured with a ring at the lower end thereof which permits attachment of a blade with a nut and bolt made of TEFLON material. The nut and bolt prevents the stirrer blade from flipping over during assembly and allows for a controlled tightening force to be applied to ensure that the blade remains in proper stirring position during use. The nut and bolt design permits use of the shaft with any stirrer blade having a keyhole cutout or circular opening. A method of stirring contents in a laboratory flask by attachment of the stirrer blade to the stirrer shaft with a nut and bolt is also disclosed.

Abstract: A paddle shaft assembly having adjustable-pitch paddles for use in a magnetic stirring apparatus. The paddle assembly is particularly useful for magnetic stirring apparatus used for suspending cell, or tissue, cultures in a growing medium. The paddle shaft assembly includes an upper support shaft lockable to a lower support shaft for allowing the assembly to be mounted within a magnetic stirring vessel closure. The lower shaft includes a bore for accommodating removable stirring magnets. The paddle shaft assembly further includes removable paddle members having a hollow body sized and configured to be positionable within a 360 degree arc upon end portions of stirring magnets.

Abstract: To ensure retentioin of the blade tongue 16 of a prop-fan blade 10 within a receiving slot 24 in the disc arm 20 of the fan hub 4 even under the high centrifugal forces exerted on the blade 10 while rotating at high rpm, at least one pair of retaining pins 30 and 40 are provided. First seating grooves 32 and 42, respectively, are provided on opposite faces 15 and 17 of the blade tongue 16 and holes 34 and 44 are drilled transversely through the disc arm 20 so as to form corresponding second seating grooves 36 and 46, respectively, on opposite side walls 26 and 28 of the slot 24. The first and second seating grooves are arranged opposite of and parallel to each other such that each pair of grooves 32 and 36 form a retention channel between the first face 15 of the tongue 16 and the opposed side wall 26 of the slot 24 and aligned with the holes 34 and 44 for receiving the retaining pins 30 and 40 thereby locking the blade tongue within the slot 24.

Abstract: An impeller for an axial flow fan having adjustable veins which are suspended in a rigid supporting ring. The ring is centered and fastened by radial supporting plates which comprise at their periphery circumferential collar elements which engage with recesses on opposite sides of supporting ring. The supporting plates are connected with the supporting rings using bolts and are connected to each other by a spacer element. The spacer element also forms a slide guide for an axially movably adjusting disk. The veins are suspended in the supporting ring so that they may be individually adjusted.

Abstract: Preloading and retention of a variable-pitch, light-weight propeller blade (10) are achieved through a retention assembly wherein the blade shank (20) is retained within a hub arm (24) with an inboard angular contact pitch change bearing (30) and an outboard angular contact anti-rocking bearing (50) which is elastomerically preloaded. The outboard bearing (50) is disposed intermediate a bearing race (34) on the shank (20) and an annular frusto-conical rigid support member (62) which is biased outboardly against the anti-rocking bearing (50) by an annular frusto-conical body (72) of elastomeric material selected to impart a desired stiffness and/or damping effect to the retention assembly.

Abstract: A pitch retention member rotatably mounts a propeller or fan hereto radially outwardly from a spinner or a hub. The member attaches to the blade of a pair of tenons, each tenon having a hole passing therethrough for receiving a pin about which the blade may rotate. The pitch retention member cooperates with a motion limiter provided at the base of the blade to: damp rotational movement of the blade about the pin to minimize blade angular excursions when centrifugal loads are low; improve high speed blade stability; moderate blade vibratory motion and tune out undesirable blade resonant frequencies; and, absorb force created by impact with foreign objects. Such impact is adsorbed at a desired threshold level of bending load of a crushable material disposed within the blade retention pitch member.