US1466472A - Fan - Google Patents

Description

Aug. 28, 1923.

Y 1,466,472 E. N. FALES FAN Filed May 24. 1926 2 Sheets-Sheet 1 Aug. 28,1923.

. E. N. FALES FAN Filed May 24 1920 2 Sheets-Sheet 2 Dayton, in the county of hlontgorne y Patented 28, 192?.

ELISHA N. ran-Es,

or nar'ron, onto.

FAN.

Application filed May 24, 1920. Serial No. 383,768.

To all whom it may concern:

Be 1t known that ELK" l. citizen of the United States, re

State of Ohio, hare invented new and usiul Improvements in Fans, of which too following is a specification.

This invention relates to improvements in fans, and more especially to that type 0'? small high speed rotating fan, usually electric, used in homes and oiiices for cooling and ventilatin The ordinary tan referred to above produces a narrow high speed blast. It has been found that such ablast of air has but little effect on adjacent air lyingjust outside of the blast itself. The cooling effects are felt only by objects lying directly in the air streams, and there, in most cases. the high velocity of the air has undesirable etfecfs. It is obvious that the field oi influence of such a fan is limited by the width of the air stream produced. In most cases, where a larger more ditlused blast of more slowly moving air was desired it was thought necessary, heretofore, to use a larger slow speed fan with longer blades. or pro-.

of influence of the d an without increasing its size.

The objects of my invention ret-erred to above and others will appear more fully as I proceed. with my specification.

In the forms of device embodying the features of my invention and shown in the accompanying drawings, Fig. 1, is a front plan view of a fan adapted to produce a ditlused blast of air in the form oi a flat tened wedge. Fig. 2. is a sectional view on the line l of Fig. 1. Fig. 3; is a view similar to Fig. 1 showing a modified form. Fig. L is a sectional view on the line 6 of Fig. 3. In 5 is shown for illustrated purposes, in operation, an ordinary fan without a shroud. Figs. 6 and 7 show a modified form of fan with a continuous shroud composed.

the. u' otor housing of ,nietrically opposite.

of separate segments. Figs. 8, 9 and 10 are vertical sectional views showing different forms of shrouds.

As shown in said drawings, :20 ind catesof ordinary. construction, the pedestal being indicated by 21, 22 the shaft on the projecting'end of which is mounted in any suitablernanner" the hubQS carrying the blades 2 lnthe various Views and modified forms these parts of the fan are indicated by identical refer ence numerals. I 5 Y In Fig. l, l have shown a shroud with'two sections removed. In other words, 7 the shroud in Fig. l is formed by two segments indicated by 36, each extending approximately 90 of the entire tan blade periphery and arranged diametrically opposite each;

other. As viewed in Fig. 1- the rotation of the fan is clockwise, one of the segments 3-6 extending froin'the top, in a clockwise direction for 90 and the other arran geddia- In 3 l have shown a fan respects to the one shown inl-Fig. 1,:except that the shroud segments as indicated in gencral' by 46 are formed of the cylindrical surfaces l? and the plane surfaces 48 at right angles thereto at the back- The typical air blast from an ordinary tan without a shroud as shown in Fig. 10 in creases its velocity and contracts a'l'ter lcaw ing the fan blades, and, especially. near to the fan, it becomes a concentrated stream,- the energy due to its motion being localized in a comparatively small diameter. With the fans shown in .1- and 7 the blast produced is more diflusedydiverging as it leaves the fan. The shroud prevents the air from flowing inward rapidly at the blade tips as it norinally, tends to do. The constricted intalre'area also prevents air from flowing into the fan at the tips. and lets air reach it only from therear. The rotating blades of .the fan exert a centrifugal blower action on I similar in all the air at these sections flows into the fan radially, and in ignore or less normal embodying" the features of my invention, it

, pendent .Fig. 1 adapted The combination of the normal flow at these sections with the diverging flow eaused'hy the shroud segments gives a flattened wedge shaped discharge blast. Since the air is "somewhat whirled by the fan the shroud segments must not be placed opposite each other at the same height if horizontally disposed flattened wedge shaped blast is de sired; but the shroud segments must be given a lea l or. placed out of the horizontal as shown in the drawings. Their exact po sition will depend on their shape, size and subtended angle. In Figs. 6 and 7 I have shown a tan with a shroud 26 which is formed of four indeseparately removable segments each extending 90 of the entire circumference. I

When the segments are all in placea continuous shroud is formed; If desired, two segments may be removed as shown in Fig, 7, makinpja fan similar to the one shown in to give a flattened wedge shaped blast. V r

In Figs. 8,9, and 10., I have shown different forms that the shroud may take. In each casefli have indicated the shroud by the reference numeral 97. r V

In the various views, the direction of air currents is indicated by the arrows. V Although I have shown certain devices is obvious that, without detracting from the spirit of" my invention, many variations in the form and construction may be made;

F or example, the fans may be manufactured and sold as a whole, or merely shrouds or segments of shrouds adapted for attachment to existing fans may be made. Also, many and various methods of attaching the shrouds 40 andsegments be used. They may be attached to the motor housing as shown, or to the pedestal, or to the ordinary wire guard which is found on most fans. It is obvious also that, without detracting from the spirit of my invention, the shrouds and segments may be used with or without the ordinary wire guards. t is obvious also that "any form of continuous shroud maybe fastened to the four blades and rotate with them.

It is my intention to claim in the appended claims all novelty inherent in my inven tion as broadly as possible in View of the prior art. f i

W hat I claim as new and desire to secure by Letters Patent is:

1. A fan with circular segments of a shroud lying outsidethe blade tips substantially as shown. l

A fan with a circular shroud composed 6 I of independently removal segments sun rounding; the blade tips.

8. A with segments of a substantially frusto-conical shaped" shroud surrounding" the blade tips. i

In testimony whereof I have hereunto set my hand an d seal. this 6th day of May, 1990, ELISHA N. FALES; [1,. s] I

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