US847585A - Pressure-fan. - Google Patents

Description

PATENTED MAR. 19, 1907.

J. KEITH.

PRESSURE FAN.

APPLICATION FILED JUNE 12.1906.

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M TH 3 NT OM Em T Yd u 2% M A JY B VWW \NlTNEsSEs No. 847,585. PATENTED MAR. 19, 1907.

' J. KEITH.

PRESSURE FAN.

APPLICATION FILED JUNE 12.1906.

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\NVENTQR, JAM E5 KEPr BY Attornej UNITED STATES,

JAMES KEITH, OF LONDON, ENGLAND.

PRESSURE-FAN.

No. 847,585. Specification of Application filed June 12, 1906- Serial No- 321,324.

To all iohom it may concern:

Be it known that I, JAMES KEITH, a subject of the King of the United Kingdom of Great Britain and Ireland, residing at Lonuseful lmprovements in Pressure-Fans, of which the following is a specification.

This invention relates to pressure-fans ofthe ty e 'in which a large number of small curved blades are secured in addle-wheel fashion on a rotating shaft and tted in a casing having a central eye or eyes for the airinlet and a tangential outlet.

The present improvement consists, primarily, in providing the blades with guardchecks or rings at each end and furnishing the fan-casing with corres onding guardcheeks closely fittin those 0 the fan to prevent backflow of t e air drawn in at the central eyes by the action of the blades which direct the air through the oulet and also in providing means for perfectly balancing the wheeiiwhile driving it from one side at high spee In the accompanying drawings, which illustrate the invention, Figures 1 and 2 are vertical sections of the improved fan, taken at right angles to each other, Fig. 2 being drawn end of the shaft is secured centrally of the width of the casing the boss E of a fan-wheel E, to which are secured in a manner shown, particularly at Figs. 3 and 4, a number of curved blades F, extending laterally to an equal distance on each side of the center of the wheel and terminating on. each side in I I cheeks H, bolte don, England, have invented certain new'and inlet-opening 'to obtain t ciency. Generally twenty blades should be PATENT OFFICE.

Letters Patent. Patented March 19, 1907.

uard-cheeks G, made in the form of rings,

inding together the blades and closely fitting into corres ondinglyshaped guardd to and extending within and around the'fan-casing A, the construction being such as to leave on each side a re-' cess S between the said guard-cheeks H and the internal walls of the case A.

The Wheel being run from its center on a long bearing protruding into the fan-casing, it is not liable to oscillate or go ofi the trut when driven at high speeds, and the guardcheeks G and H may closely fit into each other, so as to preclude back esca e of the air drawn into the central eyes by t e action of' the blades, which latter are slightly curved inward at the running edges, so as to cut or scoop up the incoming air on each side.

The fan-blades are preferably made of the form illustrated, being suitably proportioned as regards depth and length relative to the fitted in the wheel, though the invention is not limited to that number.

. Having now described my invention, What I claim, and desire to secure by Letters Patent' of the United States, is

The improved pressure-fan, comprising,

in combination, a fan-casing having central )7 intake-eyes, and a tangential-outlet, and

formed with annular guard-cheeks around said eyes, recesses being left between said cheeks and the internal walls of the casmg, a

blade-wheel formed with cheeks fitting said.

first-mentioned cheeks, a bracket bolted to the casin and a shaft having a bearing 1n said brac et and protruding into said casing and carrying the blade-wheel.

name to this specification in the presence of two subscribing witnesses.

i JAMES KEITH.

Witnesses:

K ,l IlVALLAoE FAIRWEATHER, QJNo. ARMSTRONG, Junr.

In testimony whereof I have signed my

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