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Publication numberUS2028985 A
Publication typeGrant
Publication dateJan 28, 1936
Filing dateMay 25, 1932
Priority dateMay 25, 1932
Publication numberUS 2028985 A, US 2028985A, US-A-2028985, US2028985 A, US2028985A
InventorsMahon Clarence A
Original AssigneeMahon Clarence A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 2028985 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jam 28, 1936. Q AI MAHON 2,028,985


Filed May 25, 1932 (/are ce /Z Mao/z ATTORNEY.

Patented Jan. 28, 193


Clarence A. Mahon, Kansas City, Mo. Application May 25, 1932, Serial No. 613,425

2 Claims.

My invention relates to fans and particularly to those; for circulating air in cooling, heating, or ltering systems and has for its principal object to 'provide av circulatingunit having a fan ring so formed that a ancan be rotatively mounted therein in a manner to prevent re-entry of air into the ring, thereby eliminating eddy currents, or what is commonly known as negative air now, around the ends of the fan blades, and materially increasing the flow of air from a fan.

A further 'object of the invention is to provide an outlet for the' cabinet embodying sound-absorbing qualities for decreasing the noise created by the fan and its driving motor.

In accomplishing theseand other objects of my invention, I have provided improved details of structure, the preferred forms of which are shown in the accompanying drawing, wherein:

Fig. l is an enlarged rear, elevational view of a circulating fan and its mounting, illustrating particularly the corresponding diameters of the fan v.and the small end of a funnel-shaped outlet opening. Y

. A Fig. 2 is a substantially central cross section on the line 2-2, Fig.Y 1.

Fig. 3 is a diagrammatic view illustrating the increased ow of air by the induced draft created about the innersurface of the ring.

, Referring more in detail to the drawing:

I9 designates a perforated as shown at 2i and having its In order that the motor and fan may be con-v centrically, yet yieldingly, suspended in the outlet, I preferably provide radial springs 30 connected at their outer ends by hooks 3l and bolts 32 to the inner end plate 24 and having their opposite into a mounting ring 34v surrounding the motor. A plurality of 'set screws 35, arranged centrally be-- tween the eye bolts 33, as best shown in Fig. 1, are threaded through the mounting ring into engagement with the motor housing to provide for hunted radial adjustment of the motor in rela- .,endsv hooked in eye bolts 33 threaded tion to the ring.

Attention is directed-particularly to the fact that the fan 28 is positioned in inwardly spacedrelation with the outer end of the funnel-shaped outlet ring 20 and is of a diameter corresponding substantially to the small end of the outlet sol air into .that negative air ow or back .iiow of circulating unit including a funnel-shaped outlet or fan ring 28, preferably smaller end directed forwardly'within a hexagonal frame 23, including end plates 2 4 and 25 that are connected with the ends of the ring to provide a chamber which is 'lled with a sound-absorbing material indicated at 26 so that noises created by operation of a motor 21 and a fan or propeller 28 xed on a shaft 29 of the motor will penetrate the perforated funnel and be absorbed by the material (Cl. 23o-120) the cabinet is prevented by passage through the outlet of a stream of air completely filling the outer end opening,

The increased diameter. of the inner end of the additional air at a slower velocity into the opening, thereby supplying air for an induced draft extending beyond the end of the propeller to entirely eliminate negative air flow and materially funnel-shaped opening further permits intake of increase ow of air from the fan as shown by the 10 arrows in Fig. 3. n

The novel formation of the outlet funnel ring 20 as .well as the relative diameters of the fan and outlet insures discharge of air in a continucompletely till the small end of the outlet opening, thereby preventing return now of air.

The body of insulation 26 surrounding the outlet funnel is exposed to atmosphere by the perthe noise arising from the operation of the motor and the fan, although obviously the funnel-shaped outlet may be employed without the perforations and surrounding acoustical material under opernoise is not objectionable.

By provision of the mounting ring in adjustable relation to the motor, it is possible to mount the fan in accurate concentric alignment with the port for absorbing vibrations of the fan and motor.

What I claim and desire to secure by Letters Patent is:

a propeller type fan, a cone-shaped ring having an air inlet at one end of larger diameter thanl the fan and having an air outlet at the other end substantially equal to the diameter of the fan, and

the cone of the ring and in inwardly spaced relathe fan completely iills the air outlet to vprevent a propeller type fan, a cone-shaped perforated ring having an airinlet at one end of larger diameter than the fan and having an air outlet at the other end substantially equal to the diameter of the fan, means supporting the fan concentrically within the cone of. the ring and in inwardly spaced relation to said air-outlet whereby the air without being cut ofi by the ring, and a sound absorbing material encircling the ring and exposed through said periorations to deaden the sound of the air moving through the ring under the propelling influence of the fan.

tion to said air outlet whereby the air stream from eddy currents without being cut 01T by the ring. f 2. A device of the character described including 45 ous stream of suiiicient cross sectional area to l5 forations 2i in the funnel and absorbs much of 20` ating conditions where a moderate amount of '25 outlet of the ring and to produce a flexible sup- 30 1. A device of the character described including 35 means supporting the fan concentrically within 40 stream from the fan completely lls the air outlet CLARENCE A. MAHON.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
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US2634906 *Feb 10, 1950Apr 14, 1953Heiman Sidney JCabinet-enclosed window ventilating fan
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U.S. Classification415/119
International ClassificationF04D29/64, F04D29/60, F04D29/66
Cooperative ClassificationF04D29/646, F04D29/664
European ClassificationF04D29/66C4B, F04D29/64C2