Improvements in Apparatus for Crushing or Pulverizing Ores, Cements, and other Substances.
Year: 1888

page_text: Date of Application, 6th Sept., 1888
Complete Specification Left, 16th Nov., 1888
Complete Specification Accepted, 8th Jan., 1889
Improvements in Apparatus for Crushing or Pulverizing Ores,
Cements, and other Substances.
I, WILLIAM HENRY COWARD, of Newark House, Railway Place, Bath, Engineer
and Machinery Broker do hereby declare the nature of this invention to be
as follows:-
-
My Invention relates to apparatus for crushing or reducing to powder, materials of
all kinds, such as ores, cements, etc. etc.; and it consists in the combination with
a rotary pulverizer constructed as hereafter described, of means for supplying to-
the pulverizer the material to be crushed and of apparatus for removing the
ground material without interrupting the working of the machine.
The pulverizer consists of a flat drum or casing mounted to rotate on hollow
trunnions in a suitable support and containing a heavy edge runner which runs
loosely within the drum in contact with its inner periphery. The edge runner is
somewhat narrower than the drum to afford space for radial ledges or cups with
which the inner walls of the drum are provided, and which serve to raise the
reduced material to the upper part of the drum. The runner is formed with central
bosses which revolve in contact with the sides of the drum, and ensure its steady
working. The ledges or cups might be bolted outside the walls of the drum and
caused to act in the same way, by a space being cut for the material to fall through.
In this case the edge runner would be the same width as the drum.
The material to be reduced is fed to the machine through the centre of one of the
trunnions, and the crushed or powdered material is drawn or forced through one of
the trunnions by an exhaust or blowing apparatus connected with either, or both, of
the trunnions, and deposited in a settling chamber.
Dated this 6th day of September 1888.
W. H. COWARD.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents

page_text: Improvements in Apparatus for Crushing or Pulverizing Ores,
Cements, and other Substances.
1, WILLIAM HENRY COWARD, of Newark House, .Railway Place, Bath, Engineer
and Machinery Broker, 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 :--
My Invention relates to apparatus for crushing or pulverizing; consisting of a
revolving drum having an edge runner rolling therein and provided with means for
supplying the material to be crushed and for removing the ground material in a
continuous manner without interrupting the working of the machine.
Reference is to be had to the accompanying drawings forming part of this specifi-
cation wherein figure 1 is a longitudinal, and figure 2, a cross-sectional, elevation of
the machine. Figure 3 shews a modification. The saine letters of reference indicate
the same parts in all the figures.
The pulverizer consists of a flat drum A mounted to rotate on a horizontal axis and
containing a heavy edge-runner B which is loose within the drum and remains at
about the lower part thereof whilst the drum revolves, the runner thus being caused to
roll in contact with the periphery of the drum and to crush or pulverize the material
brought under its action. The edge-runner has central bosses b which fit between
the ends of the drum and keep the runner steady, the remainder of the edge runner
being narrower than the drum, to afford space for cups C which are fixed to the inside
of the ends of the drum. These cups are preferably of the wedge-shape shewn,
and are disposed wholly around the inner faces of the drum, their mouths facing the
direction in which the drum rotates, so that in revolving with the drum they will carry
up the partially ground material and let it fall back again through a current of air
passing across the drum. The cups might, however, be pockets fixed to the outside of
the drum, over apertures in the ends thereof, as shewn in figure 3, in which case the
edge runner would be of full width at its periphery but should be of less than half
the diameter of the drum, so as to leave a clear passage through the trunnions. The
casing A is mounted upon hollow trunnions A¹ A² supported in bearings in a suitable
frame and to the one trunnion is applied a screw-conveyor D in connection with a
hopper F whereby the material to be operated on is fed from the hopper into the
casing A. The other trunnion communicates with an exhaust fan E of a suitable kind
whereby a current of air is continuously maintained through the drum, for the purpose
of winnowing the partially crushed material falling from the cups or lifters C, the finer
particles being carried off and deposited in a chamber. Instead of, or in addition to,
an exhaust current, air may be forced through the spindle of the conveyor D which is
made hollow for the purpose of admitting air. G is a diaphragm of wire gauze
stretched across the outlet trunnion, to arrest material, which has not been sufficiently
reduced and prevent the same being carried into the fan. At H there is an opening
for the purpose of admitting air to the fan and avoiding clogging.

page_text: The drum A is slowly revolved by a belt or gear applied to its periphery in order to
produce the rolling motion of the edge runner,
and the fan E and conveyor D are
driven at suitable speeds.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination with a pulverizer, consisting of a revolving drum having an
edge runner rolling therein and traversed by a current of air as described, of means,
substantially as described, for lifting the partially ground material and letting it fall
back in the drum, as specified.
2. In a pulverizer such as herein described, the combination with the revolving
drum constructed with hollow trunnions, of a screw conveyor applied to the one
trunnion and of an exhaust fan applied in connection with the other trunnion, as
specified.
Dated this 16th day of November 1888.
W. H. COWARD.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.