US 1996195 A
Description (OCR text may contain errors)
April 2, 1935. J. U N 1,996,195
ELECTRIC FAN Filed May 5, 1933 Patented Apr. 2, 1935 y UNITED V i. f1996195 ,II M
KELECTRIQIFANT; A d p I I Julian K. Fergusn, "1 ampa,' c Applic tion May 5, 1933, Serial N6. 69,613 f Y 4ci ms.j o1.23o 2is w This invention relates 'in'genera'l to ventilating fans, and more particularly to portable fans of the radial blade type adapted for use in households;
As well known this art, ventilating fans in 5 common use are of the type including abasef on which a standard rises to support ahorizontal' shaft about which the fan blade structure is mounted to rotate. Thesefans'are ordinarily rotated by a rather bulky motor placed "to one side of the center of the fan assembly; and supported by the standard. Fans; of this'character'are usually ill balanced, and awkward; to move from one location to another. Furtherythe compare; tively large motor unnecessarily" increases'gthe dead air space at the 'centerof the fan, and there,- by decreases the efiici en'cyof the fan for ventilating purposes. I
It is the main object of the present invention to overcome the defects of the fans heretofore in common use, by eliminating the clumsy motor at the center of the fan structure, and by substituting therefor an annular field winding concentric with the fan; the blades of which are provided with an armature cooperating with this winding to effect rotation of the fan when the winding is energized.
Another object of the invention is toprovide a fan of the type described which can be manufactured very cheaply as by stamping out the several elements thereof of sheet metal.
A further object of the invention is to provide a fan of this type with a guard frame having its parts symmetrically arranged on opposite sides of the fan blade structure.
Other objects of the invention will become apparent as the detailed description thereof proceeds.
In the drawing: 7
. Figure 1 is a front elevation of the fan constructed according .to the present invention, parts,
casing 2 with plate I forms the base of the instrument and is provided at itslower end with me turned flanges 3 to seat onthe base plate I, and
at its upper end is cut away to form a seat adapted to receive the lower end of a skeleton guard frame designated generally by the reference numeral 4.
The frame 4 comprises two spiders 5 and 6,
ticn to another. 1
each stamped out of sheet metal, and simila each other in every respect. The spiders 5 and 6 are annular and-havetheir outeredges shapedto form parallel circular flanges; T and*8', respec-" tively, which are adapted to be clamped against oppositesides of an annular laminatedfiled'plate 9. I To hold thefianges l and 8 againsttheoppm; s'idesid'es" of the field plate 9, a circular 'bandflfl of springymaterial is mounted'to' engage' the' v The band In issplit and is provided at its o positeends with lugs ;l3 and I4. These'lugs are suitably bored to receive the shank l5 of a bolt adapted to be operated to draw the ends of the band I 0 toward each other and thereby clamp the flanges I and 8 of the spiders 5 and 6 securely 7 against the opposite sides of the plate 9.
The plate 9 is slotted across its inner periphery to receive the coils I 6 of electric wiring having its ends connected to the socket I! of a fittmg l8 acter detachably to asource of electrical energy.
, commonly used to connect devices of this char- The spiders 5 and 6 at their centers are shaped to provide solid supporting walls l9 and 20 for the shaft 2] on which the hub 22 of the fan 23 is suitably mounted to rotate.
The outer ends of the blades 24 of the fan 23 are rigidly connected to the annular armature 25 which has its outer periphery concentric with and slightly spaced from the inner periphery'of the field plate 9. Itv will be evident from the dising its field secured between plates which form a guard for the fan 23. The band It! may be'provided with a handle 26 adapted to facilitate the movement of the fan as a whole from one loca- The fan is intended to be rotated at various speeds. For this purpose, the windings of the motor are'connected attheir lower ends to condensers 21 which may be connected by means of a closure so far that the ran 23 with armature 25 3 constitutes the rotor of an induction motor havpivoted switch 28 to the motor winding to vary the speed thereof. The invention is-not cony cerned with any particular type of switch, or any particular type of winding. .It is primarilycon y cemed with the mounting of the fanblade structure so that both sides of the fan blade assembly present substantially the same appearance, and
so that the assembly .is properly balanced, with the parts thereof symmetrical with respect to a plane perpendicular to the axes of rotation of the fan, to facilitate carrying the same from one location to another.
The peculiar construction of the spiders 5 and 6 and their connection by the band H) to the plate 1 8 which forms the field of the motor, form a very rigid assembly adapted to receive many kinds of attachments. The circular field plate 9 serves as ve tion; l
What l-elaimisz- 1 ,lnienslee ieri ani basei twesimilerrdished sp des R etes-Qs d iasRa eQ ana tirer lationsh atmsaid base aend xtendlns roundaedwfixedi tewbev uter ne inheri sioi sa d-plates to: term ,aniannular: channeb atshait fixed to he. centers; on said: l tes, a hub otatable 3911 said. sba ts e we a-z aid. plates fan: blade xtend adisl x mm sa d=hub a-.r. ns ermatur se ured to-tbewoutem ds Qfzfiflid blades; ania nular fle di w ndinsiior seidlarmature ecu e saidwchan: n hend-e teo insiwithou breakaround;saidar: maturefand meansn: s id baseit mnt el energization of said field.
2; Inan electrician; aabesestwe smiles pid plates dished toward their centers and provided with flanges at their peripheries, a flexible band extending around the peripheries of said plates and having parallel grooves receiving said flanges to form an annular channel, means at the ends of said band for clamping the band to said plates, a shaft fixed to the centers of said plates, a hub rotatable on said shaft, fan blades extending radially from said hub, a ring armaturesecuredto the outer ends of said blades, an annular field winding fixed in said channel and extending without break around said armature, and means in said base to control energization of said field, said spiders being fixed to said base withithe clamping means concealed therein.
3, Inan electric fan, a base, two similar spider plates spaced apart and mounted on said base to .forma skeleton guard frame, a band extending around and fixed to the outer peripheries of said'plates to form an annular channel, a shaft fixedtothe center of said plates, a hub rotatable n aidsha tbetw n said plat fanblades ex tending, radially. from said hub, cooperating electrioalimeanson the endsof said fan blades and, in said: channel to, cause rotation of. said blades, anda-switch controlling the operation of,
fan, and means for, controlling the operation of.
said fantrotat nemeans, th parts aid frame being., ,ymmetrical withrespect toaplane perpendicularv to ,the-aXis of, rotation of said fan.