D. FRASER. ROTARY PAN, APPLICATION FILED AUG. 19, 1910.

998,889, Patented Ju1y25, 1911.

WITNESSESZ ATT'Y S* COLUMBIA PLANounM-n o., WASHINGTON. I I. c.

NED

Vil @FFQE :DANIEL FRASER, OF LOS ANGELES, CALIFORNIA.

ROTARY FAN.

To all whom it may concern.'

Be it known that l, DANIEL FRASER, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Rotary Fans, of which the following is a specification.

My invention relates to rotary fans and has particular reference to devices of this class designed to be used for Ventilating apartments although it may be employed wherever a current of air is required to be produced for other purposes.

The chief object of the improvements which constitute the subject matter of this application for patent are:-to provide a Ventilating fan that is simple in construction so that it may be economically manufactured, effective in operation and having the very important additional function of serving as a dust collector, thus tending to cool and purify the air of the heavier foreign particles that may be floating therein.

An incidental advantage of the construction of the fan is observed in the balancing or equalizing of the air pressure upon opposite sides of the wheel web or central disk, d ue to perforations formed therein, and to the form and arrangement of the fan blades.

accomplish the desired results by employing the device illustrated in the accom,- panying drawing which forms a part of this application, the details of construction being` disclosed in the following` views Figure l is a side elevation, and Fig. 2 an edge view of a Ventilating wheel or fan em-y bodying my improvements.

Referring to the details of the drawing the numeral 5 indicates a circular disk forming the web of the wheel and provided with a suitable hub, preferably formed in two halves 6, furnished with flanges 7, between which the disk 5 is clamped and firmly secured by screws or rivets 8, the wheel thus assembled being mounted upon a drive shaft 9, supported in any desired manner. Upon each side of the said disk at spaced intervals Specification of Letters Patent.

Application filed August 19, 191D.

Patented July 25, 1911 Serial No. 578,041.

are secured radially arranged vanes 10, 10, which have the function of the ordinary blades of a fan or blower. Each vane is formed of a single piece of sheet material, approximately triangular in shape and bent at an angle along the line 12, so that its opposite portions are relatively inclined, and having two of its edges bent to form attaching flanges 1l, secured to the disk by rivets 13. As these flanges are in the same plane, the remaining portion of the vane or blade will incline away from the disk producing an angular cavity or pocket bounded by relatively inclined plane sides. The pockets are arranged alternately, or in stagg-ered relation upon the opposite sides of the fan and that portion of the disk forming the inner wall of the pockets upon one or both sides of the wheel are furnished with perforations 14, arranged in groups, the inner walls of the buckets upon the opposite side being imperforate or blank, and the free margins of these imperforate cups or buckets are cut away or notched, as shown at 15, thus reducing the resistance proportionately to the lessening of the area of the bucket.

T he operation of the wheel is as follows lVhen rotated in the direction of the arrow, the mouths of the buckets being in advance, the effect will be to cause a certain amount of compression within the cavities of the cups or pockets, producing a rotary circulation of the air from both sides at once, the greater portion of the air being thrown by the centrifugal force of the rapidly rotating cups radially from the periphery, when the wheel is rotated without a casing, as shown. A considerable proportion of the air which enters the buckets will pass through the perforations 14, and as this will have a tendency to retard the air movement, this reduction of the flow causes the heavier particles of dust which are carried along by the swifter current, to move more slowly at this point and lin-ally settle and become lodged in the imperforate buckets, thus collecting a large proportion of the dust in the air which comes under the influence ofthe rotating fan.

Having thus described iny invention what groups7 each group being covered upon one l claim as new, is side by one of said blades. l0 A rotary i'an comprising a disk7 a series of ln testimony whereof I atIiX my signature triangular blades arranged in staggered rein the presence of two Witnesses.

lation upon each side of said disk7 said blades DANEL FRASER.

being bent so that they forni pockets having 1Witnesses:

relatively inclined plane sides, said disk hav- OCTAVE LAGMAN,

ing perforations therethrough arranged in ANGUS R. LINDLEY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.