Year: 1893

page_text: blades are so placed relative to one another that they at no point overlap and hence
as the fan or wheel rotates the light is not obstructed, neither does one blade take
the air or a portion of it from another.
The fan or wheel is strengthened by means of spokes S and the shafting is
revolubly supported in a suitable frame as shown.
In the form of blade or template shown in Figure 4ª the bend extends from
point C to the edge at point D. The part C D D2 is gathered to form a
strengthening rib. In this construction the braces L are dispensed with one entire
edge F D D of the blade or template being secured to the hub.
In this construction, similar to the former construction, the air is first cut by the
edges E of the blades and on account of the gradual inclining or sloping of the first
half G of the blades it is deflected forward through the fan on an incline at first
and until again deflected by the second portions H of the blades striking and
pushing it forward which together results in turning the air from an oblique or
diagonal course to a straight course or in lines parallel with the axle. The con-
struction thus combines in a single set of blades the pulling and pushing of the
air which hitherto it has been considered necessary to employ two sets of blades to
accomplish.
In the modification shown in Figure 5 my fan is shown in a blower case for the
purpose of giving pressure to the air as well as agitating it and starting it in cir-
culation. In this construction it will be noticed that the air opening is equal in
diameter to the diameter of the fan, this being rendered possible from the fact that
there is no back pressure of air. The result is that the fan is driven with less than the
usual amount of power and more air is agitated and it is discharged with equal
pressure.
In the modification shown in Figure 6 two fans are employed and the air is
taken in on both sides of the case instead of one side only. It is discharged in the
usual way.
It is evident that light changes might be resorted to in the form and arrange-
ment of the seal parts described without departing from the spirit and scope of
my invention and hence I do not wish to limit myself to the exact construction
herein set forth, but,
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
1. In a ventilating fan or wheel, a blade bent diagonally into two planes, and
bounded on two edges with converging curved lines, the other two edges bounded
by converging substantially straight lines, substantially as set forth.
2. In a ventilating fan or wheel, the combination with a hub and peripheral
ring, of blades bent diagonally into two planes and having two converging curved
edges and two converging substantially straight edges, the straight edges secured
to the hub and ring, the attachment at the ring being in rear of that at the hub.
3. A ventilating fan or wheel composed of a series of blades each bent diagonally
into two planes, two edges converging on curved lines and two in substantially
straight lines, substantially as set forth.
4. In a ventilating fan or wheel the combination with a hub and ring, of blades
composed of blanks of sheet metal bent diagonally into two leaves, one edge of
each blade secured to the ring and one edge extending from the ring more or less
directly to the hub, said edges being in the same plane with the ring, substantially
as set forth.
Dated this 10th day of January 1892
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.