IMPROVEMENTS IN FAN BLOWERS
Year: 1865

page_text: LETTERS PATENT to Wilson Ager, of the City of New York, in the
United States of America, but at present residing at the European
Coffee House, in the City of London, Engineer, for the Invention of
"IMPROVEMENTS IN FAN BLOWERS."
Sealed the 30th June 1865, and dated the 4th January 1865.
PROVISIONAL SPECIFICATION left by the said Wilson Ager at the
Office of the Commissioners of Patents, with his Petition, on the
4th January 1865.
WILSON AGER, of the City of New York, in the United States of
America, but at present residing at the European Coffee House, in the City
of London, Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN FAN BLOWERS," to be as follows:-
This Invention relates to a peculiar construction of fan blower, whereby a
greater power of blast is obtained than by the fans hitherto in use.
According to one modification of this Invention, the blades of the fan are
carried by a disc wheel which is keyed or otherwise secured to the fan spindle.
Each fan blade is curved outwards and backwards as regards the direction of

page_text: revolution, and is throughout its entire length of a V-form in transverse
section, the hollow or trough being on the front side of the blade. The disc
wheel is situate in the centre of each blade so as to intersect it longitudinally,
one half or side of the blade being on each side or face of the disc; one end
of these blades extends nearly to the centre of the disc, whilst the outer end
projects some little distance beyond the periphery of the disc. The trough or
channel of each blade is both broader and deeper at the inner end than at the
outer extremity, and it is preferred to remove or bevel off the corner of each
side of the trough or V at its outer end.
According to another modification, the disc wheel may be dispensed with,
and the curved V-shaped blades may be each carried by a separate arm on a
boss fast on the spindle of the fan; the whole is enclosed in an ordinary fan
casing shaped to conform to the taper of the blades.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Wilson Ager in the Great Seal Patent Office on the
4th July 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILSON
AGER, of the City of New York, in the United States of America, but at
present residing at the European Coffee House, in the City of London,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of January, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-eighth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Wilson Ager, Her special license that I, the said Wilson Ager, my
executors, administrators, and assigns, or such others as I, the said Wilson
Ager, my executors, administrators, or assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during.
the term therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN FAN
BLOWERS," upon the condition (amongst others) that I, the said Wilson
Ager, my executors or administrators, by an instrument in writing under my
hand and seal, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and

page_text: cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Wilson Ager, do hereby declare the
nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the fol-
lowing statement, reference being had to the accompanying Drawings, and to.
the letters and figures marked thereon, that is to say:
My said Invention relates to a peculiar construction of fan blower, whereby
a greater power of blast is obtained than by the fans hitherto in use.
According to one modification of this Invention, the blades of the fan are
carried by a disc wheel which is keyed or otherwise secured to the fan.
spindle. Each fan blade is curved outwards and backwards as regards the
direction of revolution, and is throughout its entire length of a V-form in
transverse section, the hollow or trough being on the front side of the blade;
the disc wheel is situate in the centre of each blade, so as to intersect it
longitudinally, one half or side of the blade being on each side or face of the
disc. One end of these blarles extends nearly to the centre of the disc,
whilst the outer end projects some little distance beyond the periphery of the
disc. The trough or channel of each blade is both broader and deeper at the
inner end than at the outer extremity, and it is preferred to remove or bevel off
the corner of each side of the trough or V at its outer end.
According to another modification, the disc wheel may be dispensed with,
and the curved V-shaped blades may be each carried by a separate arm on a
boss fast on the spindle of the fan.
In both arrangements I prefer to enclose the revolving blades between a
pair of discs which are secured to the sides or lateral edges of the blades, and.
are open in the centre, and converge towards each other at their peripheries,
these discs forming, in fact, a portion of the revolving part of the fan; the
whole is enclosed in an ordinary fan casing shaped to conform to the taper of-
the blades.
And in order that my said Invention may be fully understood, I shall now
proceed more particularly to describe the same, and for that purpose I shall
refer to the several Figures on the Sheet of Drawings hereunto annexed, the
same letters of reference indicating corresponding parts in all the corre-
sponding Figures.
Figure 1 of my Drawings represents a side elevation of one arrangement of
my improved fan blower with the side of the fan casing removed to show. the ▸
internal arrangement; Figure 2 is a corresponding vertical section of the same,

page_text: showing the revolving blades and disc in edge view; and Figures 3 and 4
represent transverse sections of one of the curved trough-shaped blades taken
along the lines 1, 2, and 3, 4 respectively in Figure 1.
A is the outer casing of the fan, which may be of any suitable or well-
known construction; B is the fan spindle working in tapered adjustable collar
bearings C, C, contained inside the bosses D, D, which are fitted to each sido
of the fan casing by means of screws passing through the arms E, E, and into
the side of the casing. The spindle and collar bearing are, by preference,
slightly tapered, so that by adjusting the bearings longitudinally along the
spindle by means of the screwed glands a, a, the bearing can be tightened
up, and compensation for wear of the spindle and bearing is thus obtained.
b, b, are set nuts and screws for adjusting the longitudinal position of the
spindle B in its bearings, and ensuring the exact central position of the fan
itself between the two sides of the casing. F is a disc keyed or otherwise
secured on to the longitudinal centre of the spindle B, and to each side of
this disc are rivetted or otherwise secured the two sides or halves of the curved
trough or V-shaped fan blades G, G. These blades may be either of uniform
depth and width throughout, or (which I prefer) they may be slightly reduced
in depth and width towards their outer extremities, as shown by the two
transverse sections at Figures 3 and 4, the casing being shaped to conform to
the taper of the blades, as shewn in Figure 2. H, H, are the lateral apertures
for the inlet of the air; I is the air outlet, and K the rigger keyed on to the
spindle B for driving the fan.
Figure 5 represents an edge view of my improved fan blades-detached, having
a disc L rivetted or otherwise secured to the sides or edges of the blades ;
these discs are dished so as to converge towards or approach each other at
their peripheries, contracting the outlet for the passage of the air at the cir-
cumference of the fan, their object being to reduce as much as possible the
noise of the fan when at work. An opening is left in the centre of each disc
for the free inlet of air to the fan blades G.
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe, in conclusion, that what I consider to be novel and
original, and therefore claim. as the Invention secured to me by the herein-
before in part recited Letters Patent is,
First, the application and use to and in fan blowers of curved trough-
shaped blades, by preference of a V section, substantially as herein-before
described.
Second, the combination in fan blowers of curved trough-shaped blades, by

page_text: preference of a V section with a central disc, substantially as herein-before
described and illustrated by my Drawings.
In witness whereof, I, the said Wilson Ager, have to this my Speci-
fication set my hand and seal, the Third day of July, in the year of
our Lord One thousand eight hundred and sixty-five.
WILSON AGER.
(L.S.)