Abstract: A fan housing for allowing air to circulate through a fan having rotating fan blades while serving as a safety guard. The housing includes a circumferential wall located about the fan blades. The wall is shielded to a degree sufficient to inhibit the insertion of fingers or the like into the path of the blades adjacent to the blade path and relatively more open along other parts of the wall. The fan housing also includes front and rear safety panels. The fan housing has separable portions which may be pivotally opened and closed without the use of tools for allowing ready access to the fan unit within the fan housing for cleaning and maintenance.

Abstract: A grill for appliances such as, for example, portable electric fans, heaters, humidifiers, radios, etc. The grill may be used to prevent individuals from touching the appliance's internal components while, nevertheless, allowing movement of air and sound therethrough and/or merely for decorative purposes. The grill is made up of a plurality of elongate ribs spaced apart from each other and which define a plurality of slots therebetween. Each rib is shaped having a central peak extending upwardly from side portions located on the right and left sides of the central peak. The central peak and the side portions are connected together via a curvilinear region and, thus, each of the ribs generally have a bell-shape. The ribs each have an outer surface that is coplanar with the fan/heater unit front surface and, thus, define a flat plane outer surface. The flat plane outer surface, in perspective, appears to have depth beyond the flat plane surface.

Abstract: An air blower including a rear housing defining a plurality of air inlet openings; a front housing having an annular peripheral portion secured to the rear housing, a central support portion within the peripheral portion and including a rear surface facing the rear housing and an oppositely directed front surface, and a grillwork portion extending between the peripheral portion and the support portion; and a fan assembly secured to the rear surface and projecting toward the rear housing, the fan assembly including an electrical motor and a fan blade rotatably coupled therewith, an electrical switch operatively connected to the motor, and an actuator operatively coupled to the electrical switch and projecting outwardly from the front surface. Mounting of the fan assembly on the central support portion simplifies assembly and minimizes external size of the blower.

Abstract: A portable electrical fan including a housing defining inlet and outlet openings for transmitting air flow; a fan blade disposed in the housing; a motor disposed in the housing and rotatably coupled to the fan blade; and an elongated support having opposite end portions attached to the housing and an intermediate stand portion shaped and arranged to support the housing on a surface. Also included are electrical controls connected to the motor and retainer means retaining the electrical controls fixed to the elongated support. This arrangement provides a portable electric fan in an efficient, low cost configuration.

Abstract: A low-aspect ratio propeller system is provided with a multiple ring structure formed with a plurality of circular or non-circular, annular, narrow equivalent air foil rings which are held by rails in a predetermined relationship with the propeller blades. The upstream ring is located downstream from the tip vortex of the propeller within the axial span of the propeller. One or more additional downstream-located rings are used so as to provide at least one annular multiple ring-defined pump aperture through which peripheral vortices generated by the propeller blades or fan blades may enhance the mass flow. In one propeller system, a low-aspect-ratio propeller is employed with high blade angles of attack and non-stall capability to generate strong vortices which enhance the beneficial effect of the multiple ring structure. These vortices increase thrust because their induction action on the rings increase beneficial ring flow circulation.

Abstract: A helicopter strike wire cutting apparatus extending from the fuselage of the helicopter to the rotor blades for cutting wires that strike the helicopter during flight. The cutting apparatus includes cutting edges along the rotor control rods and can be arranged to direct a strike wire toward the midpoint of the rod. A second embodiment having cutting edges on a drum rotating with the rotor is also disclosed.

Abstract: A rotating fan guard is disclosed that prevents personal injury to people working near a rotating fan while reducing the noise level of the fan as compared to a fan with a stationary fan guard. The rotating fan guard comprises a plurality of concentric rings spaced so as to prevent the ingress of a person's finger between the rings and into contact with the fan blades. The concentric rings are attached to the fan rotor to which the fan blades are also attached. The fan guard thus rotates along with the fan blades. The rotating fan guard produces air flow having less air turbulence and less generated noise, relative to a stationary fan guard. The rotating fan guard generates mostly "white noise" which is less hazardous to human hearing than "pure tone" high frequency noise generated by prior art stationary fan guards.

Abstract: A fan comprises a pair of guard halves which surround an impeller. One of the guard halves is smaller than the other guard half, such that the smaller of the two may be stacked within the larger to reduce the required space for packaging. Due to the inventive construction, the required space for packaging the guard is substantially reduced over prior art structures which have guard halves of approximately equal dimensions. Further, an inventive packing structure is disclosed wherein the individual components of a guard/impeller subassembly are securely packaged relative to each other. In particular, an impeller is positioned within the stacked guard halves, and secured at a relatively fixed positioned by resilient packing materials. The guard halves are preferably formed by a number of radially and circularly extending wires. A plurality of foam blocks are spaced in the stacked guard halves, at positions spaced from the impeller.

Abstract: A unitized metallic fan housing having a peripheral wall spaced about a fan's axis of rotation and extending axially therebeyond. A plurality of flanges are integrally connected to and extend substantially perpendicular to the peripheral wall toward the axis of rotation. At least one screen is connected to the flanges by rigid but malleable tabs formed thereon that are bent around a peripheral strand of the screen. Apertures are defined by and extend through the flanges to provide access to the tabs such that the tabs may be urged toward the peripheral wall to tension the screen therewithin, whereby the rigid nature of the tabs secures the screen to the flanges in a tensioned position. Holes are defined by and extend through the peripheral wall to provide access to the tabs such that the tabs may be urged from the peripheral wall to reduce the tension of the screen and to disengage the peripheral strand from the tabs such that the screen may be removed from the peripheral wall and replaced.

Abstract: A flywheel has a hub with a plurality of blades secured to said hub and extending away therefrom. A plurality of ribs are secured to the blades to form a protective enclosure which rotates with the blades. The ribs are spaced apart a distance selected to inhibit insertion of the user's fingers thereinbetween.

Abstract: Disclosed herein is a fan which has a conical guide in an upper protection cover of the fan for guiding air flow to disperse in 360 degrees, a lamp hood on the guide, a lighting element and a set of batteries in the guide, and a push-button switch in the center of the upper protection cover to turn on and off the lighting element. Moreover, the lamp hood is formed with a plurality of slots so that a plurality of openings are formed after assembly of the guide and the lamp hood, and an appropriate quantity of cotton or other liquid-absorptive material is placed in the guide so that perfume can be poured through the openings and then absorbed by the cotton or other liquid-absorptive material to provide an aromatic smell during operation of the fan.

Abstract: A cooling fan apparatus having a cooling fan, a fan shroud and a screen. The screen comprises a bell mouth ring and a screen portion. A bell mouth ring is disposed in front of the fan shroud by a predetermined distance. The screen portion comprises a plurality of rings and a radial grid disposed around the rings at the periphery of the screen.

Abstract: A fan apparatus including a housing defining an air inlet opening, an air discharge opening; and a bearing surface; a fan blade rotatably mounted in the housing and adapted to provide air flow in a given direction between the inlet and discharge openings; and a deflector rotatably mounted in the discharge opening on the bearing surface and shaped and arranged to interrupt and redirect air discharged thereby, the deflector adapted to be rotatably propelled in the discharge opening by air discharged thereby. Also included is a resilient member engaged between the deflector and the housing and exerting therebetween a force establishing a level of friction between the deflector and the bearing surface. The resilient member establishes smooth and uniform rotation of the deflector.

Abstract: The noise of operation of a fan assembly having a fan blade which rotates in a predetermined direction upon operation of the fan assembly may be reduced by the use of an intake grill including an inner central portion, ring elements disposed in mutually spaced, concentric relation to one another about the central portion, and spirallly-extending support elements connected to the central portion and to the ring elements. The intake grill further includes mutually circumferentially-spaced finger elements connected to and projecting away from a grill mounting surface which are also connected to the outermost ring element and thereby support the interconnected ring elements, central portion, and support elements in spaced relation to the grill mounting surface. Stiffening elements may be disposed between adjacent support elements and connected to selected adajcent ones of the ring elements.

Abstract: An environmental conditioning apparatus including a control unit for conditioning a surrounding environment; a housing retaining the conditioning unit and comprising a flange defining an opening, the flange having inner and outer flange edge portions separated by oppositely directed front and rear flange surface portions; and a grill covering the opening and comprising a rim juxtaposed to the flange, the rim having inner and outer rim edge portions separated by oppositely directed front and rear rim surface portions and the rear rim surface portion facing the front flange surface portion.

Abstract: A hinged and quick mount guard for an electric fan. The fan guard includes a concave, dish-shaped rear guard member having an axial opening for the reception of a fan motor shaft, and a plurality of key holes for the reception of thru-bolts on the fan motor for securing the rear guard member to the fan motor. The fan guard includes a concave, dish-shaped front guard member hingedly and releasably retained on the rear guard member.

Abstract: A ducted fan including a funnel-shaped duct positioned upstream of the impeller and connected to a base, an outer cowling concentrically positioned downstream and attached to said duct through a series of ribs, an inner cowling positioned inside the outer cowling and surrounding the impeller and a circular grill attached to the discharge end of the inner cowling. The grill including a center hub and a series of arcuate-shaped ribs extending outwardly from the hub and having a constant curvature of less diameter than the outside radius of the grill whereby the maximum lateral spacing between the ribs is at a radius inboard from the outside radius of the grill.

Abstract: The drawings and description describe a hand-portable fire fighting, positive pressure blower 10 for providing positive pressure within a smoke filled space to remove the smoke, heat and carbon dioxide from a smoke filled space to facilitate the extinguishment of the fire and the overhauling of the space subsequent to the extinguishment. It further greatly enhances the safety of the fire fighters. The blower 10 includes a portable support frame 12 having an internal combustion engine 13 mounted thereon with a two blade wooden prop 18 mounted on the drive shaft for generating a cylindrical stream of fast moving air to be directed into the smoke filled space. The blower 10 includes a tilting mechanism 22 that has a lead screw with a crank that extends between a front leg frame section 58 and a central frame section 24. The front leg section 28 has a vibrational dampening cross frame element 60 that extends between the forward extending left front leg 62 and the right front leg 64.

Abstract: A protective fan shield for securement about an associated rotating blade fan. The shield is formed of open mesh fiberglass netting with a resilient continuous elastomeric band at a terminal end for securement of the shield about the associated fan. The shield is further formed with pockets formed within the surface of the shield and directed orthogonally relative to the ribs defining the protective cage of the fan. The pockets enable securement of flexible strut for maintaining the shield from entering between the support ribs of the associated fan.

Abstract: A convertible air cleaner comprising an elongated enclosure forming an internal cavity. A first opening is at one end of the enclosure and a second opening is at an opposed end of the enclosure and with the openings oriented substantially at 180.degree. from each other. A support structure holds the elongated enclosure at a substantially center axis between said first and second openings. A pivot permits rotation about said center axis between said first and second openings through an arc of at least 180.degree.. An air filter is contained within the enclosure and a fan is positioned within the enclosure for drawing air through said first opening through the internal cavity for filtration by the air filter for exiting to the exterior of the enclosure through the second opening.

Abstract: A fan guard comprising front and rear portions each including a plurality of radially extending wires circumferentially spaced supporting a plurality of concentrically mounted wire rings. Some of the radially extending wires include an end having a homogeneously extending tab formed thereon. The tabs have a front and back side and are formed by bending the end of the wires into a P-shaped loop defining a slot having parallel edges. The tabs are offset with respect to the portion's joining plane so when the guard portions are assembled the front side of the tabs of the front portion engage the back side of the tabs of the rear portion to form abutments with each other in an interlocked relation preventing axial separation of the guard portions and the loops align to receive a bolt upon which a nut is threaded to secure the guard portions together.

Abstract: A detachable electric fan and more particularly a built-up electric fan comprising component parts of detachable stand and one set of built-up blade-protective covers for easy carriage and storage; a stand being consisted of a transverse base plate having a connection trough at the top in the center with rib channels provided, and an independent vertical frame plate having a control switch button set mounted thereon and elastic retainers and reinforcing ribs at the bottom for connection with the base plate; the blade-protective cover symmetrically arranged, each blade-protective cover being composed of two semi-circular cover plates with one symmetric set of pin holder and locking pin for easy assembly, each blade-protective cover being supported with a circular supporting plate by bolts, the rear blade-protective cover having an axial hole for insertion of motor shaft to let the fan blades be well protected; by the built-up component parts to form a detachable electric fan for easy carriage and to reduce the

Abstract: A low impedance safety guard for an air circulating fan with rotating fan blades which prevents a human hand, finger or foot from getting into the path of the rotating blades while yet achieving the unrestrictive air stream benefits of a relatively open guard which is generally considered unsafe. The guard comprises rear and front parallel and opposing substantially open, air stream unobstructive fan blade guard faces which will permit the hand, finger or foot to pass partially therethrough. A substantially closed circumferential wall is provided which connects the rear and front faces to enclose the fan blades approximately equal distant from the respective faces to prohibit the hand, figure or foot from reaching the blade path after passing partially through either face should a person unfortunately attempt to do so.

Abstract: A fan-filter combination which can be used to remove air-borne contaminates in air that is directed into or exhausted from localized areas includes a filter affixed to a fan unit by a bracketing structure into which the filter is slidingly receivable.

Abstract: The invention is directed to a protective cover for the air intake opening in a blower-vacuum apparatus. The cover contains opening defined in the cover having a large cross sectional area relative to the area of the air intake opening. The openings in the cover are in the vertical wall of the cover to force the air to enter the apparatus radially.

Abstract: A filter device for use in conjuction with a ceiling fan, for removal of smoke and other pollutants from the room air during the operation of the fan. The device is affixed to the ceiling and to the post from which the fan housing is suspended, such that air containing pollutants that is pulled upward across the diameter of the fan blades, passes through the device.

Abstract: A ventilator housing with at least one protective screen for covering a ventilator positioned in a housing, whereby through-hole borings for fastening the protective screen with fastening elements are provided in the walls of the housing. The fastening elements are formed as pin-shaped fastening studs, which can be inserted into the through-hole borings of the housing walls, and which have, on their peripheral surfaces, tongue-like springy counter-hooks which are directed in the direction opposed to the direction of insertion of the stud, being angularly to the longitudinal axis of the stud, so that after insertion of the studs into the borings, at least one counter-hook engages the housing wall under prestressing.

Abstract: A fan casing for mounting a plurality of motor/fan units for cooling electronic apparatus mounted in racks or cabinets, the casing comprising two identical planar members to be assembled so that the motor/fan units are sandwiched between the planar members with finger guard members covering openings in the planar members. Inwardly directed projections formed by a pierce and plunge operation are provided on the planar members to engage in apertures in the motor/fan units to locate the motor/fan units and indentations are formed in the planar members to receive and locate the finger guard members so that when the two parts of the casing are assembled the finger guard members are disposed between the motor/fan units and the planar members. Attachment means are provided engaging in recesses to couple the two planar members one to the other, each planar member has parts of side walls and end walls integral therewith and the overall height 2D of the casing is 45 mm.

Abstract: An outdoor fan backpack for cooling the head of an individual while he or she is working outdoors in the hot sun. A small, quiet, lightweight, electrical fan, is supported just above and to the rear of the head by a mounting plate and guard attached between two vertically disposed and adjustable tubular members which are strapped to the back of the individual by shoulder straps and a belt. The electrical fan is operated by a control switch and a battery pack mounted on the belt.

Abstract: A cooling assembly including a fan blade subassembly for receipt about a drive shaft and a protective shroud secured to the fan blade subassembly for rotation therewith.

Abstract: An extremely efficient, substantially noiseless portable fan suitable for household use is provided which produces a highly focused, homogeneous stream of substantially laminar flow air to achieve effective air movement and cooling throughout an entire room. The fan includes a torus-shaped shroud, the intake portion of which has aerodynamic configuration having a precisely engineered geometry to minimize turbulence and promote laminar flow. The shroud intake portion includes an exterior angled Venturi surface, which extends toward the shroud intake orifice, to intersect with a radiused edge which joins the Venturi surface with an interior aerodynamic surface. An impeller assembly including a central bullet-shaped nose cone and a plurality of aerodynamically-configured radial blades are mounted within the shroud to further minimize turbulence and promote smooth air flow.

Abstract: A fan guard for ceiling fans comprises a circular grill member supported below the blades of the fan on equally spaced support arms extending radially outward from a clamp attached to the pipe extension suspending the motor housing from the ceiling. The fan guard may be provided with a circumferential open skirt portion, or an enclosed skirt portion interposed between the support arms and the grill. The grill member includes arcuate removable portions for adapting the guard to receive a depending portions of a conventional ceiling fan.

Abstract: An improved mounting system for attaching a temperature switch to a fan structure is disclosed having a housing which may be directly attached to the protective grille of the fan. The housing may be detachably mounted on the fan structure such that it locates a temperature sensor of the temperature switch in the airstream generated by the fan. The temperature switch is connected to a control system which controls the fan in conjunction with the temperature of the airstream.

Abstract: A fan guard assembly comprising a pair of mirror image plates, each of said plates having a plurality of perforations extending therethrough to define a plurality of air flow passages. The plates further include a flange-like surface extending radially outward from the top, bottom and the outboard side. The inboard sides of the plates are placed in overlapping relationship with respect to each other. The plates are joined together about the overlapped portions to form the fan guard assembly.

Abstract: A waterproof fan is disclosed as including an inverted bell-shaped canopy adapted to be suspended from overhead and having a support rod extending to a second canopy, the top and bottom edges of which are provided with a rubber hood and cowling, respectively; the second canopy covers the top of a motor housing and a fixed shaft connected to the canopy extends into the motor housing on which a plurality of fan blades are attached for rotation therewith.

Abstract: A rotating wind-guiding shell for an electrical fan effectively changes the direction and magnitude of the blowing wind from the fan. The pressure and the direction of the wind from the fan can be varied instantaneously and the effective wind field can also be enlarged. At any place within the effective wind field, one can produce a variation of the pressure and the direction of the wind from the fan while it is continuously operating. The structure of the device is simple so that its cost is very low and it can be used as a desk-fan, floor-fan, ceiling-fan or a wall-fan by a simple adjustment at its support.

Abstract: A ventilator according to the invention comprises at least two blades fixed to a hub adapted to be made integral with a motor shaft, a protection grille integral with said hub, protecting the front of the ventilator and being extended on the periphery of the ventilator by an annular casing assuring the protection of the radial ends of the blades.

Abstract: An electric fan comprising a motor to retain and drive vanes, an annular main body to retain the motor and to serve as an air flow passage of the fan, a pair of pivots which are provided on the main body, have their axes on a phantom straight line substantially perpendicular to the axis of rotation of the vanes and are symmetrical with respect to said axis of rotation, and a pair of support plates which are rotatably connected with each other and with the main body by means of the pivots, the support plates being of a shape which surrounds the main body and does not hinder the movement of the main body on the pivots. The fan can serve as a table fan, a circulator, a wall fan or a window fan by selectively changing the relative position between the main body and the support plates.

Abstract: A device for mounting a motor-blower unit at the air inlet of a heating or air-conditioning installation of the passenger space of a motor vehicle, wherein a cylindrical cradle for receiving the motor cage comprises abutments cooperating with a lower edge of the cage, and hooking means formed by longitudinal fingers with resilient attachment, said fingers ending into hooks coming in engagement with an upper edge of the cage for fixing the latter against movement.

Abstract: The present invention relates to a fan unit which may be used either as a floor fan or as a window mounted fan. When used as a floor fan, the frame is supported on the floor and the motor driven fan unit, which is pivotally connected to the frame, may be rotated to provide air flow in any direction. The fan unit comprises an open frame having a motor driven fan connected to the rear portion thereof, a pair of protruding pins on the frame front portion which engage the window on the outside thereof, and a second pair of protruding pins on the frame front portion which engage the window frame on the inside thereof. The motor driven fan is suspended in this manner inwardly away from the window opening such that the cantilever effect produced thereby pulls the first pins inwardly against the window and pushes the second pins outwardly against the window frame.

Abstract: A mechanical device for assisting in the application of fingernail polish or enamel, and subsequent drying, makes use of a housing containing an electrically operated fan which moves an air stream upwardly through the housing and out the top. A bracket serving as a hand rest and finger support having a specially constructed attachment to the housing is movable to a position above the air stream where its attachment releasably retains the bracket in finger supporting position and in the air stream. The specially constructed attachment is such that when the bracket is thus positioned an extension of it on opposite sides, protruding beyond the housing, elevates the housing above a supporting surface on which it may rest to assure an abundant supply of air to the fan. When not needed as a hand rest in finger supporting position, the bracket pivots to an endwise location where it can serve as a carrying handle.

Abstract: The forwardly open intake end of a jet engine, powering an aircraft, is screened against birds and other airborne objects by a conical cage formed from an array of metal rods converging on the engine axis, the rods being held together at the vertex of the cone by a solid tip and in an intermediate plane as well as at the cone base by a pair of metal rings. In flight, they are free to vibrate so as to shake off adhering ice particles. De-icing can be further promoted by feeding back exhaust gases from the rear of the engine to the interior of the cage through an external pipe.

Abstract: The open wire grid safety guard enclosure for a fan and its motor is rectangular box-like in shape and is made up of two substantially identical halves.Each half is made from identical cruciform blanks of grid mesh wires with parallel closely spaced wires extending in one direction and connected by more widely spaced cross wires, including marginal cross wires at the ends of the arms of the cross form. The arms of the cross form are bent inwardly of the box form through an angle of about 105.degree. from the planes of the centers of the blank. Hinge means connect the opposed marginal wires along one side edge of the box and are recessed inwardly of the planes of the outer edges of the sides by the angle of the bent arms. Releasable latch means connect other marginal wires at points spaced from the side with the hinge means. A plate welded to the center of one side of the box carries supporting connections to a fan motor and fan blade enclosed in the box.

Abstract: A portable air circulating fan, especially a high velocity fan in which a rotary air impeller is mounted on the shaft of an electric motor while a guard is provided which encloses the impeller and may enclose part or all of the motor, and which guard is formed into separable forward and rearward sections. The electric motor for the fan is supported on one of the guard sections near the center, especially the rearward guard section, while a support frame is provided for the fan having a base portion and a pair of spaced upstanding legs which are connected to the sides of the guard, and about which points of connection the fan is tiltable. Advantageously, the legs are also connected to the rearward guard section but may, alternatively, be connected to the forward guard section. In this manner the rotating air impeller is guarded at all times.

Abstract: A ducted fan including a funnel-shaped duct positioned upstream of the impeller and connected to a base, an outer cowling concentrically positioned downstream and attached to said duct through a series of ribs, an inner cowling positioned inside the outer cowling and surrounding the impeller and a circular grill attached to the discharge end of the inner cowling. The grill including a center hub and a series of arcuate-shaped ribs extending outwardly from the hub and having a constant curvature of less diameter than the outside radius of the grill whereby the maximum lateral spacing between the ribs is at a radius inboard from the outside radius of the grill.