Abstract: A collar of a ceiling fan is composed of a plurality of sectors and each sector has a protrusion extending from a top thereof and a recess defined in an outside thereof. A resilient member is connected to each sector and includes a first portion having an aperture for receiving the protrusion, and a second portion which is a triangular member including two inclined sides. The resilient member is engaged with the recess of the sector corresponding thereto. The blade bracket has an end block which is engaged with the recess corresponding thereto and compressed by one of the inclined sides of the resilient member.

Abstract: A variable-pitch propeller, especially for a sport board, has angularly displaceable blade support plates which can be rotated about respective radial axes. The plates are provided with radially inwardly directed claws which engage in circumferential grooves of bases of the blades. The latter can have radial projections reaching beneath the claws. The resulting bayonet connection simplifies mounting and dismounting of the propeller blades even under water.

Abstract: A fan assembly according to which a block member is connected to a rotor end casing and an arm member having a blade connected thereto is mounted to the block member. One of the members has a radially extending slot formed therein and the other member has a mounting flange adapted to extend into the slot when the arm is moved radially outwardly relative to the block member to mount the arm to the block member without the need for additional components.

Abstract: A motor drives a hub having axially extending blind tapered recesses to receive tapered shoes on a plurality of blades, and threads which fasten a ring that presses the shoes axially into the recesses have a hand-direction that tend to tighten in response to the rotation of the shaft. The recess is partially defined by a forward downward sloping upper wall. The shoe includes a forward downward upper surface. The recess sloping wall functions as a positive stop for seating the shoe by engaging the sloping shoe surface and as a centrifugal force absorbing wall during rotation of the 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 includes a motor casing with an engaging ring connected to the bottom of the motor casing, the engaging ring having a plurality of tapered recesses defined in the bottom thereof and each of the recesses having an open end in the inner periphery of the ring and a closed end on the outside of the ring. Each of the recesses has two grooves defined in the two sides thereof. Each of the fan blade brackets has two flanges to be received in the grooves. The first end of each of the end members is stopped by the closed end of the recess. A plurality of balls movably received in the ring and the balls respectively extend into the respective recesses so as to contact the second end of the end members in the recesses.

Abstract: A ceiling fan assembly and method for assembling same in which a fan blade is placed over an arm having a post that extends in an opening in the blade. A fastener is attached to the post to secure the blade to the arm, and a flange on the arm is inserted in a slot in the rotor of the fan motor to retain the arm, and therefore, the blade, relative to the rotor.

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: 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: The turbine comprises a plurality of blades disposed around a hub between two end plates, with the blades, the hub, and the end plates being made of thermostructural composite material. The hub is made by stacking plane annular plates of thermostructural composite material along a common axis. Each blade is made individually by shaping a two-dimensional fiber fabric in plate or sheet form to obtain a blade preform, by densifying the preform with a matrix to obtain a blade blank made of thermostructural composite material, and by machining an outline for the densified preform. Each end plate is obtained by making an annular preform by means of a two-dimensional fiber fabric in plate or sheet form, and by densifying the preform with a matrix to obtain a part made of thermostructural composite material. The blades are assembled to the hub between the end plates, with each blade being connected to the hub by a portion forming a blade root.

Abstract: An assembling device for the blade of the hanging fan which comprises a ring body arranged on the bottom of the motor unit and having a plurality of dovetail grooves on rim thereof, and blade base has corresponding dovetail shape such that the blade base can be inserted into the dovetail groove and the blades are fixed.

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 fan for a vacuum cleaner has a fan housing, motor and impeller. The fan housing has an inlet and outlet. The impeller has a one piece hub and multiple flexible blades. This flexible blade fan provides better air performance, less noise, better durability, and easier impeller installation than conventional vacuum cleaner fans.

Abstract: A fan for a vacuum cleaner has a fan housing, motor and impeller. The fan housing has an inlet and outlet. The impeller has a hub and multiple flexible blades. This flexible blade fan provides better air performance, less noise, better durability, and easier impeller installation than conventional vacuum cleaner fans.

Abstract: An apparatus is provided that includes a bladed device having a hub which is rotatable about an axis and one or more blades attached to the hub by self-energizing, self-locking, insertion and retention features which are formed integrally with the blade and hub. The insertion and retention features include a locking tang formed integrally with the root of the blade, and detent features which are part of the locking tang and hub. As the blade is inserted axially into the hub, the locking tang deflects radially inward and then snaps radially outward by spring action of the tang to engage the detent feature of the hub, and thereby lock the blade against further axially or radially movement with respect to the hub. The locking tang is oriented and configured in such a manner that the locking tang is self-energizing, thereby causing the tang to grip the hub more tightly as rotational speed of the bladed device increases.

Abstract: A vane suspension for angle adjustable mounting of a vane (6) in a hub (1), comprising a seat (3) in the hub and a mounting part on the vane (6). The mounting part on the vane comprises a stud (16) and a shoulder (17) provided at the end of the stud with a partly spherical contact surface (19) facing the blade (15) of the vane, and in that the seat (3) of the hub has a hub shoulder (10) with a partly cylindrical contact surface (12) radially facing the center of the hub (2), which two surfaces are arranged to cooperate mutually by linear contact, whereby the position of the line (21, 21') is constant irrespective of the angular position of the vane in relation to the hub.

Abstract: This disclosure relates to a fan for an electric machine, the fan comprising a hub having a centrally located bore sized to receive the shaft of the machine, the bore having an axis which coincides with the shaft axis. The fan further comprises a plurality of angularly spaced fan blades which extend radially outwardly from the hub. The blades are formed separately from the hub and are secured to the hub by an improved interlocking joint arrangement. A series of hubs which are substantially identical except for the shaft bore diameter are provided, and a series of blades which are substantially identical except for the radial length are provided. Thus, a hub matching a specified shaft diameter, and a blade length matching a specified housing size, may be selected and assembled to match a machine.

Abstract: A fan impeller has a hub and fan blade units with fan blades connected to the hub. The fan blade units are made of plastic material reinforced with first fibers for transmitting forces acting on the fan blades into the hub. The first fibers extend substantially parallel to a longitudinal direction of the fan blades. The first fibers are bundled at a radially inner end of the fan blades to form a tubular structure. The tubular structure has a free end that is bent radially outwardly substantially about 180.degree. to form an end ring. The end ring has a convex surface facing the hub and a concave surface facing the fan blade. Each fan blade unit has a fastening element with an annular groove for receiving the end ring, the fastening element connected to the hub. Each fan blade unit further has a fastening ring inserted into the concave surface. The fastening ring clamps the end ring at the fastening element.

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: A turbine blade having a preestablished rate of thermal expansion is attached to a turbine wheel having a preestablished rate of thermal expansion being greater than the preestablished rate of thermal expansion of the turbine blade. The turbine blade has a root portion having a first groove and a second groove therein. The turbine wheel includes a plurality of openings in which the turbine blade is positioned. Each of the openings has a first groove and a second groove therein. The space or void formed between the first grooves and the second grooves has a plurality of spherical balls positioned therein. 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 boat propeller wherein the blades are easily removable from the propeller hub on an individual basis to permit quick replacement for repair and/or for substituting blades of different pitch comprising a hub adapted to fit over and attach to a drive shaft; a plurality of removable blades positioned around said hub and extending radially therefrom, each of said blades comprising a water engaging blade portion and a rigid tang extending from the base and of such blade portion; a plurality of blade engaging sockets disposed on and around said hub, said sockets adapted to mate with and receive the tang of said blades; and preferably a cover plate adapted to fit over the portion of said tang within said socket, tang, cover plate each being provided with a plurality of aligned bolt holes; and a plurality of bolts extending through said aligned holes and holding each assembly thereof together. Further modifications include a blade assembly for use wherein less force will be exerted, e.g.

Abstract: A plastic fan with several fins attached to a hub. The fins are formed in a mold in order to reduce the difference between themselves to a minimum. The fins are attached to the hub so that each of them is retained at an angle from the adjacent one. The fan so produced is well balanced during rotation. Each fin has a male engaging device which is engaged in a female engaging device formed in the hub. The fins are welded to the hub by ultrasonic waves.

Abstract: A propeller assembly which includes a barrel with replaceable blade assemblies secured within slots formed in the exterior of the barrel. The slots include a first slot section and a second slot section with the first slot section extending radially deeper than the second slot section. The blade assemblies include L-shaped locking members which slide within the slots formed within the barrel. The shorter leg of the locking members are secured within the deeper first slot sections while the longer leg extends longitudinally within the second slot section. The locking member preferably includes a dovetail cross-section member fixing the shorter leg member to the barrel so as to prevent both longitudinal, torsional and radial movement of the blade assemblies. The barrel is preferably formed of an aluminum material or, more precisely, an aluminum alloy having 60% to 95% essentially pure aluminum while the blade assemblies and securement members are formed of stainless steel.

Abstract: A shot blasting machine is arranged for simplicity in servicing and for efficiency in operation. The number of vanes in the blast wheel is equal to the number of blades in the impeller, and the connector to connect the blast wheel to the drive hub is arranged so that the timing of the wheel is the same regardless of the orientation of the connector with respect to the drive hub and the impeller. The control cage is of a large diameter, with commensurately large impeller, so the vanes can be installed through the central opening of the wheel. Further, the vanes slide into grooves in the blast wheel, frictionally held by leaf springs, and restrained by stops in one direction only.

Abstract: The clearance necessary for the assembly of the nozzle ring of an axial flow steam turbine is localized through a temporary bolting. The localized clearance is compartmentalized by making a generally radially extending hole centered on the clearance at the circumferential location of the boundary between each pair of adjacent nozzle banks. Pins are driven into the holes and provide a seal between adjacent nozzle banks.

Abstract: A rotor assembly and methods for securing rotor blades within and removing rotor blades from rotor assemblies. The rotor assembly comprises a rotor disc defining a plurality of blade grooves, and including a plurality of tenons disposed between the blade grooves and defining a plurality of pin sockets radially extending inward from outside surfaces of the tenons; and a plurality of rotor blades, each blade including a root disposed within a blade groove to secure the blade against radial movement, and a blade platform overlaying a tenon and defining a radially extending pin aperture. The rotor assembly further comprises a plurality of locking pins radially extending through the pin apertures and into the pin sockets to secure the rotor blades against axial movement, each pin including a head and a base to limit radial movement of the pin.