Improvements in Pulverizers.
Year: 1894

page_text: Date of Application, 7th Aug., 1894-Accepted, 13th Oct., 1894
Improvements in Pulverizers.
We, THOMAS PARKER, JOHN DOUGLAS WRIGHT, FRANCIS FARQUHARSON
STUART, and ALEXANDER MAXWELL COLQUHOUN, all of No. 52, Colborne
Street, in the City of Toronto, in the County of York, in the Province of Ontario,
Canada, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
Our invention relates to improvements in pulverizers and the object of the
invention is, first, to devise a cheaply constructed and efficient pulverizer which
will rapidly reduce clay, rock or other substances to powder; secondly, to provide
means whereby only the completely pulverized clay may be ejected from the
machine; and, thirdly to provide a means to prevent damp clay when being
pulverized from sticking to the bars, projections or walls of the pulverizing
chamber and it consists essentially-first-of securing to a main shaft journalled
in the end of a suitable chamber three discs one at each end and one intermediately
situated between the end discs, the discs having cross rods extending from end to
end parallel to the shaft upon which are loosely journalled a series of arms or
beaters, which are caused to fly out by the rotary movement of the discs-
secondly of providing at the one end of the machine preferably upon the main
shaft a fan which communicates with the main chamber through a duct which leads
to the bottom of the machine where it is connected to the chamber by upwardly
extending passage-ways and further in providing an exit duct and hopper provided
with a bolting cloth through which the air is forced, the pulverized clay being
designed to be ejected through the exit duct and hopper by the fan and thirdly-of
making the walls of the pulverizing chamber hollow and introducing steam through
pipes into such hollow walls, the machine being otherwise constructed as hereinafter
more particularly explained.
Fig. 1. is a perspective view of our pulverizer with the duct and hopper removed,
portions of the end and side being broken away so as to exhibit the construction.
Fig. 2. is a cross section through the chamber, ducts and hopper.
In the drawings like letters of reference indicate corresponding parts in each
figure.
A, are the end walls of the chamber, and, B. are the side walls, which are made
hollow for the purpose of receiving steam. B, and B, are the outlet and inlet
steam pipes connected to the opposite walls, B. The hollow walls are connected
together by a pipe, B³, as indicated by dotted lines in Fig. 2. C, C', is the
bottom, which is made in two sections secured together in the centre by suitable
bolts and to the bottom of the side walls by suitable bolts. To the bottom section, C,
we secure a series of projections, c, c, extending across the machine. The
bottom, C, C', is supported upon the cross beams, D, D¹.
E, is the main shaft of the machine, which is suitably journalled in the ends of
the machine. The main shaft, D, has secured to it the end discs, F, F, and a
central disc, F. G, are rods extending from one end to the other through the
central disc, F. These rods are situated near the periphery of the discs and are
provided with a series of beaters, 11, which are loosely journalled upon the rods.
The beaters, H, extend between the discs from end to end of the rods. I, is a fan
casing, which is secured on one end, A, outside the pulverizing chamber. J, is a fan,
which is secured on the outer end of the shaft, E. The discs, F, and fan, J, are
driven from a pulley, K, on the opposite end of the shaft to that on which the fau
is situated.

page_text: L, is a conveying duct extending upwardly and laterally from the pulverizing
chamber into the hopper, M. One side of the hopper is provided with a
bolting cloth screen, m, as indicated by dotted lines. The lower end of the
hopper is open.
O, is the feed hopper which is situated at the top of the pulverizing chamber at
the right hand side.
P, is the air duct leading from the bottom of the fan casing, I, to beneath the
bottom, C, C. p, are the passage-ways leading upwardly from the air duct P,
through the bottom, C, C¹, into the pulverizing chamber. The passage-ways are
situated between the spaces swept by the beaters, H.
Having now described the principal parts involved in our invention we shall
briefly describe its operation. Upon the power being applied to the pulley, K,
and the discs rotated in the direction indicated by arrow the beaters, H, will
be caused to fly out into the position shown by dotted lines. The clay,
rock or other substances being fed into the hopper, O, will be acted upon by
the outwardly flung beaters, so that the material will be rapidly reduced to powder
or pulverized.
It will be readily seen that if the rock or clay form any obstruction to the
beaters, H, that they will on account of being pivoted on the rods, G, pass over
such rocks or projections but will quickly wear them away on account of the
rapidity at which they are rotated. The fan, J, being driven also at a high rate of
speed will force the air down through the duct, P, up through the passage-way, P,
and the pulverized clay from the rock or solid clay will be thrown toward the left
band side of the machine (see Fig. 2) up through the duct, L, into the hopper, M,
where part may come in contact with the bolting cloth while the other will pass
down to the hopper into any suitable receptacle which may be placed beneath such
hopper. The bolting cloth, M, of course allows of the air being blown out through
it but prevents any of the pulverized clay from escaping through the opening
covered by the bolting cloth.
From this description it will be seen that we provide a very effective pulverizer
in which the beaters on account of being loosely swung upon the rods, G, are not
subject to breakage and which will act very effectively with the projections, c, c',
formed on the bottom of the pulverizing chamber, so as to, rapidly grind up the
material. Although we show no steam in the bottom sections it will of course be
understood that the heat communicated from the hollow sides will be communicated
to such bottom sections, C, C³, so as to prevent any sticking of the clay or material
upon the projections c, c', or at the bottom of the pulverizing chamber.
The steam will also prevent the damp clay from sticking on the sides as it will
serve to keep the clay at both the bottom and sides perfectly dry should damp clay
be placed in the pulverizing chamber.
Again we might form the bottom sections in longitudinal grate bars and dispense
with the fan. The grate bars would preferably be formed in the shape of hollow
steam ducts or pipes so that the steam within them would prevent any damp clay
from sticking to such grate bars and choking the machine if this form were used.
It will of course be understood that our machine might be used with the main
driving shaft upright or in any other desired position, this of course depending
upon the use to which our machine is applied.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. A pulverizer consisting of a chamber to receive the material, a shaft journalled
in the ends of the chamber and provided with discs and rods, extending between the
end discs secured in them near the periphery, and parallel to the shaft and a series
of beaters loosely journalled upon the rods as and for the purpose specified.
2. The combination with the chamber, shaft journalled therein, dises on the shaft
and rods extending between the end discs and beaters loosely journalied on such

page_text: rods as specified, of the projections c, c¹, formed in the bottom of the pulverizing
chamber as and for the purpose specified.
3. The combination with the chamber, shaft journalled therein, discs on the shaft
and rods extending between the end discs and beaters loosely journalled on such
rods as specified, of a fan preferably secured on the outer end of the shaft and fau
casing having a duct leading from it beneath the pulverizing chamber such duct
having a series of vertical passage-ways extending up into the chamber as and for
the purpose specified.
4. The combination with the chamber, shaft journalled therein, discs on the shaft
and rods extending between the end discs and beaters loosely journalled on such
rods as specified, of the hollow walls, B, designed to receive live steam as and for
the purpose specified.
5. The combination with the chamber, shaft journalled therein, discs on the shaft
and rods extending between the end discs and beaters loosely journalled on such
rods as specified, of the fan, J, provided with the casing, I, and duct, P, leading
from the casing to beneath the bottom of the pulverizing chamber and provided
with vertical passage-ways, p, leading into the pulverizing chamber, the duct, L,
secured at the top of the pulverizing chamber and leading into the hopper, M,
which is provided with an opening covered by the bolting cloth, m, as and for the
purpose specified.
Dated this 7th day of Anøust 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.