IMPROVEMENTS IN ROTARY BLOWING FANS FOR PRODUCING BLAST FOR FURNACES AND OTHER PURPOSES, WHICH IMPROVEMENTS MAY ALSO BE APPLIED TO AIR AND GAS EXHAUSTERS
Year: 1868

page_text: LETTERS PATENT to Henry Aland, Ironfounder, of 18, Richard Street,
Roupell Street, Lambeth, London, in the County of Surrey, for the
Invention of "IMPROVEMENTS IN ROTARY BLOWING FANS FOR PRODUCING
BLAST FOR FURNACES AND OTHER PURPOSES, WHICH IMPROVEMENTS MAY ALSO
BE APPLIED TO AIR AND GAS EXHAUSTERS."
Sealed the 23rd June 1868, and dated 30th January 1868.
PROVISIONAL SPECIFICATION left by the said Henry Aland at the
Office of the Commissioners of Patents, with his Petition, on the
30th January 1868.
I, HENRY ALAND, Ironfounder, of 18, Richard Street, Roupell Street,
Lambeth, London, in the County of Surrey, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN ROTARY BLOWING FANS FOR
PRODUCING BLAST FOR FURNACES AND OTHER PURPOSES, WHICH IMPROVEMENTS MAY
ALSO BE APPLIED TO AIR AND GAS EXHAUSTERS," to be as follows:-
This improvement consists in the formation of a space between the
sides of the fan and the outer casing laterally on each side, also the
introduction of a conical ring round the periphery of the inlet openings

page_text: which rings may be formed by turing the edges slightly inwards, so
as to direct a given pressure from the discharge side to the supply near
the centre of the fan, thereby raising the density of the air or vapour
acted upon and increasing the amount of work done.
In the application of this improvement to an air or gas exhauster it
will be necessary to connect the two inlet openings by means of enclosed
side pipes to the vessal or chamber to be exhausted, or to other pipes
communicating with the same.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Henry Aland in the Great Seal Patent Office
on the 29th June 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
ALAND, of 18, Richard Street, Roupell Street, Lambeth, London, in the
County of Surrey, Ironfounder, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of January, in the
year of our Lord One thousand eight hundred and sixty-eight, in the
thirty-first year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Henry Aland, Her special licence,
that I, the said Henry Aland, my executors, administrators, and assigns,
or such others as I, the said Henry Aland, my executors, administrators,
and 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 ROTARY BLOWING
FANS FOR PRODUCING BLAST FOR FURNACES AND OTHER PURPOSES, WHICH IMPROVE-
MENTS MAY ALSO BE APPLIED TO AIR AND GAS EXHAUSTERS," upon the condition
(amongst others) that I, the said Henry Aland, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their
hands and seals, should particularly describe and ascertain the nature of
the said Invention, and in what manner the same was to be performed,
and 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.

page_text: NOW KNOW YE, that I, the said Henry Aland, 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 following statement, reference being had to the Drawing hereunto
annexed, and to the letters and figures marked thereon, that is to say :-
This improvement consists in the formation of a space between the
sides of the fan disc and outer casing laterally on each side, also the
introduction of a conical ring round the periphery of the inlet openings,
so as to direct a given pressure of air or gas from the discharge side to
the supply, as shewn in the accompanying Drawings.
Fig. 1 is a side elevation of blowing fan; Fig. 2 a front elevation
shewing the discharge; Fig. 3 a sectional plan, taken in the line 1, 2, of
Fig. 1; Fig. 4 is a side elevation of the fan in its application as an
exhauster; Fig. 5 a front elevation of the same shewing the discharge;
and Fig. 6 a sectional plan through the line 3, 4, in Fig. 4.
Fig. 3, A, A, are the inlet openings or supply from the surrounding
atmosphere; E, E, E, E, the inlet openings of fan disc; B, B, is the
discharge of fan disc inside of casing F, F; C, C, C, C, the conical rings
round the periphery of the inlet openings leaving a space between the
fan disc and cones, so as to direct a supply of air or gas from the dis-
charge side B, B, to the centre openings E, E, E, E, of a higher density
than the surrounding atmosphere, it will thus be seen that a continuous
pressure of air or gas will be directed from the periphery or discharge of
the fan disc and injected at the increased pressure into its centre, as
shown by the darts inside Fig. 3, thereby forming a better impinging
body, by which to produce a more perfect vacuum for the introduction
of the supply and increase the amount of work done; D, D, also
shews an internal projection round the inside of fan case for dividing
and guiding the fluid with regularity in a direction towards the
cones C, C, C, C.
From the foregoing explanation of its construction it will now be
understood that it can be applied to all disc fans, single or compound,
with conical side plates to the blades, as shewn in Fig. 2, H, H, or
with ordinary flat side plates.
Having now described the nature of my Invention, and in what
manner the same is to be performed, I wish it to be understood that
what I claim is, the directing a given pressure from the discharge of

page_text: the fan disc periphery, and injecting it into its centre as herein-before
described.
In witness whereof, I, the said Henry Aland, have hereunto set my
hand and seal, this Twenty-ninth day of June, in the year of our
Lord One thousand eight hundred and sixty-eight.
HENRY ALAND. (L.S.)