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Publication numberUS2415621 A
Publication typeGrant
Publication date11 Feb 1947
Filing date20 Oct 1944
Priority date20 Oct 1944
Publication numberUS 2415621 A, US 2415621A, US-A-2415621, US2415621 A, US2415621A
InventorsArnhym Albert A
Original AssigneeSolar Aircraft Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fan
US 2415621 A
Abstract  available in
Images(1)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

FebQll, 1947. ARN 2,415,621

FAN

Filed Oct 20. 1944 INVENTOR E6. 2.

ALBERT A. ARNHYM Y ATTORNE X Patented Feb. 11, 1947 FAN Albert A. Arnhym, Los Angeles, Calif., assignor to Solar Aircraft Company, San Diego, Calif., a corporation of California Application October 20, 1944, Serial No. 559,588

3 Claims. 1

This invention relates to small electric fans used primarily for circulating air to produce a cooling effect, although it may also be used to deliver heated air.

An object of the invention is to provide a gentle spreading stream of clean air of relatively uniform velocity over its entire cross-sectional area.

Another object is to provide a fan in which the moving blades are completely surrounded and protected.

Another object is to provide an enclosed fan that is eiiicient and is of simple and inexpensive construction.

Other objects and features of the invention will appear from the detailed description to follow of a specific embodiment thereof.

Briefly, the present invention consists of an electric fan of conventional construction mounted within a cylindrical or drum-shaped casing having an air filter in its rear end wall and an air distributor in its front wall, together with an inner shroud or transition for converging the air from the fan into the deflecting structure for facilitating the action of the latter in uniformly distributing the air.

In the drawing;

Fig. 1 is a rear view of a fan in accordance with the invention, with one half broken away to show the inner construction; and

Fig. 2 is a longitudinal vertical section taken in the plane II-II of Fig. 2.

The device comprises a cylindrical or drumshaped casing I having a base I I secured to the under side for supporting it and having a handle I2 secured to the top. The base II may be conveniently made in semi-cylindrical form with its flat face downward, this face being provided with feet I3 of rubber or the like so that the device can be set on a finished surface without marring it.

The base II may be secured to the casing III with bolts I4 and sheet metal screws I5. The base may also have a hushed opening in its rear end Wall I6 for the passage of a power cord l1, and a switch I8 of conventional design may be mounted in the base with its handle extending through an aperture to the exterior. The cord I1 extends to the switch I8 and thence through a hushed opening in the contacting portions of the base II and casing I0 to the interior of the latter.

There is concentricall positioned within the casing I0 an electric motor I9 having a conventional fan secured to its shaft at the front end of the motor. The motor casing is supported by a spider, this spider consisting of a central band encircling the motor and four radiating spoke elements 2| which extend almost to the casing wall II) where they are joined to a cylindrical supporting band 22. The band 22 in turn is secured by brackets 23 and bolts 24to a transition member 25 which in turn is secured to the casing ID in a manner later to be described.

The motor-supporting spider is formed in four sections, each section comprising a central quadrant adapted to lie against the cylindrical motor I9 and straight end sections, each of which is joined to one of the straight end sections of the next adjoining quadrant. The two pieces forming each leg or spoke of the spider may be secured together by tabs 26 out out of one piece and pressed through the other piece and bent back. To join the outer end of each. spoke to the cylindrical band 22, the spokes are provided with notches into which the band is pressed.

If it is desired that the device supply heated air, a pair of concentric heating coils 2i and 23 may be provided surrounding the motor I9. Each coil is in the form of an open helix and is sup-- ported by mica insulators 29 which are clamped between the two pieces forming each of the spoke members 2I. The heating coils are adapted to be selectively energized by means of the switch I8 which is preferably a three-position switch having a neutral position in which the fan and coils are de-energized, a second position in which the fan is energized but the coils are not, and a third position in which both the fan and the coils are energized.

The transition member 25 is concentric with re spect to the outer casing Ill but tapers from a large diameter at the rear end to a relatively small diameter in front of the fan. Thus the rear end of the transition is of the same diameter as the casing It! and is secured directly thereto by the bolt I4 and additional circumferentially spaced bolts. As best shown in Fig. 2, the transition is only slightly larger in diameter than the fan 20 in the plane of the fan and is of sornewhat smaller diameter than the fan at its forward end where it merges into and is joined to a mem ber 3I having a cylindrical portion 32 which extends forwardly a short distance from the front wall of the transition. member 25 and there merges into an outwardly flaring portion 33 which is curled back around the front edge of the casing Ill at its forward edge. There are positioned. within the flared section 33 two concentrically disposed, generally conical baffles 34 and 35 which are supported from the member 33 by bolts 35 and spacer tubes 31 and 38.

The members 25 and 3! are preferably covered on the outside with a coating 45 of thermal and acoustic insulating material, such as felt to deaden the motor and fan sound.

Th rear end of the casing is closed by a filter element 39 which comprises inner and outer screen walls which contain therebetween a suitable oil impregnated porous material such as fiber glass capable of abstracting most of the dust from the air without excessively impeding the flow of air therethrough. A decorative retaining rim 40 may be provided for holding the filter wall in' place, this rim being secured by screws 4| to brackets 42 which are welded or otherwise secured to the inner surface of the casing ID.

The structure described is capable of producing a very uniform and diverging stream of air so that it is particularly adapted for use on desks and the like in relatively close proximity to the person who is to benefit from it. The air not only has a gentle uniform motion, but is relatively clean because of the filtering effect of the porous rear wall of the casing. y

The baffles 34 and 35 in conjunction with the member 3| function to recirculate air in front of the housing and mix it with the air delivered by the fan so that of the total air projected, about 70% comes through the fan and about 30% is recirculated. This makes it possible to heat the air passing through the housing to a higher temperature and deliver more total heat without discomfort.

The device is relatively silent because of the enclosure of the fan completely within the padded casing and because of the sound dampening effect of the rear filter wall.

The converging shroud or bafile 25 permits the use of a relatively large area filter at the rear and to reduce the resistance to the infiow of air while at the same time increasing the volumetric efficiency of the fan.

If desired, a reservoir 50 having a drip valve can be mounted in an aperture provided therefor in the housing, and connected by a tube 51 to the filtering material 39 for supplying an oil base perfume or deodorant to the air.

Various departures from the exact construction shown can be made while still utilizing the essential novel features of the invention, and the invention is to be limited only to the extent set forth in the appended claims.

I claim:

1. A device of the type described, comprising: a casing symmetrical about a longitudinal axis and including a rear section of large diameter at its rear end which converges to a substantially smaller diameter at its forward end; a front section continuous at its rear end with the front end of said rear section and flaring outwardly at its front end to a substantially larger diameter; auxiliary baffle means within said flaring portion of said front section; and an electric fan mounted within said rear casing section for propelling air forwardly therethrough, the rear end of said rear casing section and the front end of said front casing section being of the same diameter; and an outer cylindrical housing joined to the outer ends of said front and rear casing sections and forming an enclosure therefor.

2. A device of the type described. comprising: a casing symmetrical about a longitudinal axis and including a rear section of large diameter at its rear end which converges to a substantially smaller diameter at its forward end; a front section continuous at its rear end with the front end of said rear section and fiaring outwardly at its front end to a substantially larger diameter; auxiliary baffle means within said fiaring portion of said front section; an electric fan within said rear casing section for propelling air forwardly therethrough; means for mounting said motor in said casing comprising a spider having an inner annular portion engaging the casing of said electric fan and having an outer ring and radial struts interconnecting said inner and outer rings; means for connecting said outer ring to said rear casing section; a heating coil concentrically disposed about the motor of said fan in lateral spaced relation to said fan and said casing; and insulating supports secured to said radial struts for supporting said heating coil.

3. A device of the type described, comprising: a casing symmetrical about a longitudinal axis and including a rear section of large diameter at its rear end which converges to a substantially smaller diameter at its forward end; a front section continuous at its rear end with th front end of said rear section and flaring outwardly at its front end to a substantially larger diameter; auxiliary baffle means within said flaring portion of said front section; an electric fan mounted within said rear casing section for propelling air forwardly therethrough; acoustically dampin filter means closing the rear end of said casing and a coating of acoustic insulating material on said front and rear casing section, the rear end of said rear casing section and the front end of said front casing section being of the same diameter; and an outer cylindrical housing joined to the outer ends of said front and rear casing sections and forming an enclosure therefor.

ALBERT A. ARNI-IYM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,427,859 Schmidt Sept. 5, 1922 1,487,828 Ziganek et a1 Mar. 25, 1924 1,713,648 Feinberg et al May 21, 1929 1,889,117 Adamcikas Nov. 29, 1932 1,906,408 Pearsons May 2, 1933 2,153,576 Kurth et al Apr. 11, 1939 2,258,731 Blumenthal Oct. 14, 1941 2,268,801 Carlton Jan. 6, 1942 2,298,576 McElroy et a1 Oct. 13, 1942 2,322,302 Martinson June 22, 1943 1,869,012 Kunian et al -July 26, 1932 2,149,689 Smith et a1 Mar. 7, 1939 1,942,758 Jessup Jan. 9, 1934 2,175,758 Neubert Oct. 10, 1939 1,993,158 Funk Mar. 5, 1935 2,130,910 Smith, Jr Sept. 20, 1938 2,161,027 Dollinger June 6, 1939 2,225,398 Hamblin Dec. 17, 1940

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1427859 *3 Jun 19215 Sep 1922Westinghouse Electric & Mfg CoPropeller blower
US1487828 *14 Oct 192225 Mar 1924Ferdinand ZiganekVentilator
US1713648 *22 Dec 192621 May 1929Arctic Nu Air CorpBlower unit
US1869012 *14 Dec 192926 Jul 1932KunianHair drier
US1889117 *28 Oct 192929 Nov 1932Massera GiuseppeVentilating device
US1906408 *4 Aug 19302 May 1933Emerson Electric Mfg CoFan
US1942758 *4 May 19329 Jan 1934Leroy Jessup GeorgeElectric heater
US1993158 *8 Sep 19305 Mar 1935George D Roper CorpAir moving apparatus
US2130910 *9 Feb 193520 Sep 1938Bendix Prod CorpFan
US2149689 *21 Jan 19387 Mar 1939Duncan Smith William AleeHeating and ventilating device
US2153576 *27 Oct 193611 Apr 1939Anemostat Corp AmericaAir supply device
US2161027 *14 Apr 19366 Jun 1939Staynew Filter CorpFan
US2175758 *27 Oct 193810 Oct 1939Neubert William MAir conditioning apparatus
US2225398 *13 Sep 193917 Dec 1940Hamblin Clyde MConstruction of ventilating fans
US2258731 *14 Apr 193814 Oct 1941Blumenthal Alexander ECombination lamp and fan unit
US2268801 *26 Nov 19386 Jan 1942 Portable fan
US2298576 *17 Jul 194113 Oct 1942Internat Engineering IncAir handling apparatus
US2322302 *23 Dec 194022 Jun 1943American Machine & MetalsVentilator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2541251 *29 Apr 194813 Feb 1951Anemostat Corp AmericaPortable electric fan
US2645704 *9 Jan 195214 Jul 1953Markuc Anton JUnit electric heater
US2694136 *13 Sep 19529 Nov 1954Gilbert Co A CAir warming and circulating appliance
US2790064 *11 Feb 195523 Apr 1957Stuart CorpMethod and apparatus for room conditioning
US2808124 *8 Dec 19531 Oct 1957Attwood John GApparatus for supplying decontaminated air
US2839657 *1 Nov 195617 Jun 1958Commercial Controis CorpSpace heater
US2900128 *15 Nov 195618 Aug 1959Markel Electric Products IncDiffuser for portable electric fan
US3191362 *5 Feb 196229 Jun 1965Knapp Monarch CoElectrostatic air purifier
US3278114 *10 Feb 196511 Oct 1966Elton L GibbsExhaust fan assembly and filter
US3375640 *13 Jun 19662 Apr 1968Crs IndAir filter apparatus
US3421687 *20 Jan 196714 Jan 1969Daily Buddy ZVertical air circulation fan
US3503465 *4 Aug 196731 Mar 1970Chiyoda Chem Eng Construct CoSilencer for suction or discharge of fluids under pressure
US3602333 *15 Oct 196931 Aug 1971Chiyoda Chem Eng Construct CoSilencer for suction or discharge of fluids under pressure
US3779341 *16 Oct 197218 Dec 1973Modine Mfg CoNoise suppressive fan shroud
US3787986 *27 Dec 197129 Jan 1974Boewe Boehler & Weber Kg MaschBlower for vehicle-drying installation
US3858644 *5 Apr 19737 Jan 1975Int Harvester CoFan shroud exit structure
US3872916 *5 Apr 197325 Mar 1975Int Harvester CoFan shroud exit structure
US4272261 *1 May 19809 Jun 1981Lynch Jr Patrick EAir purifying device
US4608063 *8 Nov 198426 Aug 1986Canon Kabushiki KaishaExhaust system for chemical vapor deposition apparatus
US4749385 *27 Mar 19877 Jun 1988Rca Licensing CorporationMethod and apparatus for providing clean air
US4750860 *20 Jan 198714 Jun 1988Tandem Computers IncorporatedFan
US4753573 *23 Mar 198728 Jun 1988Mcknight Charles AFiltering means for ceiling fan blades
US4900222 *23 Dec 198813 Feb 1990Rockwell International CorporationRotary pump inlet velocity profile control device
US4903462 *26 Aug 198827 Feb 1990Tabai Espec Co. Ltd.Oil mist remover
US5245692 *4 Dec 199014 Sep 1993Suiden Co., Ltd.Portable hemispheric electric space heater with circumferential filtered warm air discharge
US5720274 *4 Dec 199524 Feb 1998Gaggenau-Werke Haus-Und Lufttechnik GmbhLow-noise vapor exhaust hood
US6254337 *24 Apr 20003 Jul 2001Augustine Medical, Inc.Low noise air blower unit for inflating thermal blankets
US6264727 *20 Jul 199924 Jul 2001Robert L. ElmoreFilter fan
US6296692 *8 May 19962 Oct 2001Rudolf GutmannAir purifier
US6397002 *28 Nov 200028 May 2002King Of Fans, Inc.Combination fan and heater
US7008180 *26 Jun 20037 Mar 2006Seiko Epson CorporationAxial-flow fan and projector provided with the same
US9636617 *20 Nov 20142 May 2017Blueair AbAir purifier device with fan duct
US969436920 Nov 20144 Jul 2017Blueair AbAir purifier device with ionizing means
US20050019165 *26 Jun 200327 Jan 2005Seiko Epson CorporationAxial-flow fan and projector provided with the same
US20070186778 *15 May 200616 Aug 2007Dust Control Technology, Inc.System and method for suppressing dust and odors
US20090238685 *28 May 200924 Sep 2009Roland Santa AnaDisguised air displacement device
US20130255501 *29 Mar 20133 Oct 2013Wei SunOil Mist Filter
US20140038509 *2 Aug 20136 Feb 2014Soler & Palau Research S.L.Ventilation unit
US20150231543 *20 Nov 201420 Aug 2015Blueair AbAir purifier device with fan duct
Classifications
U.S. Classification96/381, 261/97, 415/121.2, 392/360, 55/467.1, 415/119, 261/142, 261/103, 55/467, 392/361, 55/491, 55/413
International ClassificationF24H3/04, F04D29/52, F04D29/40
Cooperative ClassificationF04D29/526, F24H3/0417
European ClassificationF04D29/52C4, F24H3/04B2B