AN IMPROVEMENT IN FAN WHEELS
Year: 1883

page_text: LETTERS PATENT to William Schmolz of the City and County of San
Francisco State of California one of the United States of America for an
Invention of "AN IMPROVEMENT IN FAN WHEELS "
COMPLETE SPECIFICATION filed by the said William Schmolz at the Office
of the Commissioners of Patents on the 19th June 1883.
WILLIAM SCHMOLZ, of the City and County of San Francisco, State of
California, one of the United States of America. " AN IMPROVEMENT IN FAN-
WHEELS
ג
The object of my invention is to provide a fan wheel, simple and cheap in
construction, and of great power, and adapted for exhausting and forcing
atinospheric air, vapors, and gases, from and into mines, ventilating and cooling
buildings, rail road cars or the like. I accomplish this object by the mechanism
illustrated in the accompanying drawings, in which Fig 1. is a front elevation of
my improved fan wheel. Fig 2. is a face view of one of the blades or fans.
Fig 3. is a modification showing a cylindrical rim.
Similar letters of reference are used to designate like parts throughout the
several views.
The rim A is composed of a flat sheet of metal, bent into a truncated conical
form, or of less diameter at its inner than at its outer edge. The blades B. which
radiate from the hub C. are set at an angle to the plane of revolution and are
formed preferably of smooth sheet metal.
At a point about midway between the hub C. and the rim A. I set an interior
band or rim D. likewise composed of flat or smooth sheet metal bent into the form
of a truncated cone whose apex or point of generation is the same as that of the
outer rim or tire. The sheet metal plates E. are cut in the form of a rectangle,
but the outer edge a. is curved to conform with the curvature of the rim against
which they abut and form a close connection. These plates are set between the
blades and rims, at an angle of about forty-five degrees, or in other words, said
blades are so set as to form an angle of about forty five degrees with a radial line

page_text: drawn from the centre to the circumference of the wheel, and also at about the
same angle with the axis of the wheel, and they incline upwardly and outwardly
from the line of contact with the blades to the line of contact with the rims, as is
seen in Fig 1. The object in giving the described taper to the rims is to increase
the suction and forcing capacity of the fan-wheel, and I have found by actual
experiment that a body of air can be blown or forced fully three times further
with an inwardly bevelled rim than it can be with a cylindrical rim-the number
of revolutions given to the wheel being the same.
The metal plates E. serve to stay and brace the rims and blades and at the same
time further increase the forcing and suction capacity of the wheel. By this
construction it will be seen that the outer atmospheric air is concentrated as it is
drawn through the wheel and the whole volume is driven in the desired direction.
And furthermore that when using the fan as an exhausting fan the outward flare,
given to the parts will impart a centrifugal motion to the body of air drawn
through the fan and dispel it outwardly, thereby removing a solid body of air
and enabling the wheel to be run with less applied power
Having thus described my invention what I claim and desire to secure by
letters patent, is
First. In a fan-wheel for forcing or exhausting, air, gases, or vapors, the
inclined or bevelled rim or rims A. and D. substantially as and for the purpose
specified..
Second. In a fan-wheel, the combination of the circular, tapering rims A and D.
hub C. blades or fans B. radiating from the hub, and set at an angle to the plano
of revolution, and the plates or braces E. set at an angle to a radial line drawn
from the centro of the whoel, all substantially as and for the purpose described.
In Witness whereof I the said William Schmolz, have hereunto set my hand
and seal this Twenty Fifth day of May in the year of our Lord One Thousand
Eight Hundred and Eighty Three.