SubstancED.
Year: 1888

page_text: Other SubstancED.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co. Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature of
this invention to be as follows:-
This invention relates to machines for reducing ores of the kind or class described
in the Specifications of Letters Patent of the United States dated February 19th 1884.
Numbers 293786, and 293,787 in which counter currents of air are made the agency
whereby the ore or material is acted upon for its reduction.
Immediately upon the bed structure are mounted, in proper bearings for easy
On these shafts
rotation two shafts inclined in opposite directions to each other.
respectively are pulleys arranged to be rotated in opposite directions. On their inner
or adjacent ends are provided concave reducing heads or plates having within their
concave surfaces radial ribs which plates and ribs, as a whole, I designate, for con-
venience, beaters. These beaters are enclosed, excepting above, by a casing the space
above forming communication between the said casing and an upper chamber properly
secured on the said casing, Attached to the chamber is an outlet to a settling chamber
through which the reduced material passes from said chamber. A hopper is provided
on the side of the chamber and mechanism is provided for regulating the feed through
the said hopper. Suitable air-inlets are also provided to the casing. These parts are
described in the said former specifications.
The departure in this example, upon which my improvement is based, lies chiefly in
the inclination of axes, one with relation to the other, upon which the beaters rotate,
and in the concavity of the heaters. I find that by a downward inclination of the shafts
outwardly from the beaters, and the consequent inclination of the planes in which the

page_text: said beaters rotate, that great advantages are derived. This inclination of the axes
separates the beaters further at top than bottom. The ore is fed from the hopper
through the top of case to the space between the beaters, due to their greater proximity
to each other below; is received by the latter on their lower concave surfaces, and is
thrown from one to the other and returned by the action of the ribs and commotion of
air and, if expelled by the vortex, is again caught, to be further subjected to the
operation, until so reduced as to be carried off. The reduction of ore in this class of
machines is chiefly due to impact of one particle with another and attrition caused
thereby in the powerful vortex created by the oppositely-rotating beaters. It is
obvious that the inclination, with relation to each other, of the ribbed beaters,
aided by the concavity of the latter, tends to retain the material in a smaller
compass within the vortex, by which the action of the particles upon each other is
increased, thus materially facilitating the operation of reduction. It is not essential
that the heads should be concave.
Dated this 20th day of March 1888
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Crushing or Pulverizing Ores and
other Substances.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex, 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 :-
This invention relates to machines for reducing ores of the kind or class described
in the Specification of Letters Patent of the United States dated February 19, 1884,
Nos. 293,786 and 293,787, and English Letters Patent No. 35998 in which the
reduction is effected by impact and attrition between the fragments caused by counter-
currents of air generated by oppositely-rotating beaters mounted within the reducing
chamber.
In the accompanying drawings
Figure 1 is a side view of the improved machine, partly in elevation and partly
in vertical section.
Figure 2 is an end elevation and
Figure 3 is a plan with the portions above line x x of Figures 1 and 2, removed.
Upon a bed structure or foundation A are mounted in proper bearings for easy
rotation shafts a, one of which is shown in the sectional portion of Figure 1 and the
other which is its counterpart, is opposite and inclosed the latter being preferably
their normal condition, for the purpose of protection from dust. On these shafts, a, a
respectively are mounted pulleys al and a", by which the said shafts are designed to
be rotated in opposite directions. The said shafts are moreover provided on their
inner or adjacent ends with concave reducing heads or plates B, having within their
concave surfaces curved radial ribs b, which plates and ribs as a whole we designate
for convenience "beaters." These beaters are inclosed, excepting above, by a
casing, Al, the space above forming communication between casing A¹ and an upper
chamber D, properly secured on the said casing. D¹ indicates an outlet attached to the
chamber D, through which outlet the reduced material passes from the said chamber D
to a settling chamber. E is a hopper, and E¹ the mechanism designed for regulating
the feed of the material through the said hopper. F, F' and H are air-inlets to the
chamber A. These parts are all substantially the same as described in the said
former patents.
The departure in this example upon which our improvement is based, lies chiefly
in the inclination of the axes, one with relation to the other, upon which the beaters
rotate, and in the concavity of the beaters. It has been found that by a downward
inclination of shafts a outwardly from the beaters and the consequent inclination of
the planes in which the said beaters rotate, great advantages are derived. This
inclination of the axes separates the beaters farther from each other at the top than at
the bottom. The ore is fed from the hopper E through the top of the case A' to the
space between the beaters, due to their greater proximity to each other below; it is

page_text: then received by the latter on their lower concave surfaces and is thrown from onė
to the other and returned by the action of the ribs and the counter currents of air, and,
if expelled by the vortex, is again caught to be further subjected to the operation
until so reduced as to be carried off. The reduction of ore in this class of machine is
chiefly due to impact of one particle with another and attrition caused thereby in the
powerful vortex created by the oppositely-rotating beaters.
It is obvious that the inclination with relation to each other of the ribbed beaters,
aided by the concavity of the latter, tends to retain the material in a smaller compass
within the vortex, by which the action of the particles upon each other is increased,
thus materially facilitating the operation of reduction.
It is not essential that the heads B should be concave nor that they should be
strictly in accordance with the form shown in the drawings.
The difference between the action of the machines above described and that of the
machine described in the said United States Patents consists chiefly or mainly in
this, that in the said former machines the currents of air generated by the oppositely-
revolving beaters form two annular parallel strata with a dead-air space or central
vacuum between them. The material on entering the chamber in such case will be
carried into one or the other of these currents, and may be carried around for a time
without being brought into contact with the material of the other current.
In my
present type of machine, however, the opposite currents of air generated by the
revolving beaters assume a vertical direction, the currents intersecting each other
toward the lower part of the chamber, and thus assuring the bringing of the fragments
undergoing reduction into contact with each other, whereby their rapid and effectual
reduction is secured.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what I claim is :-
First. A machine for reducing ores and the like by impact and attrition between
the fragments comprising a reducing chamber, two oppositely-rotatable heads or
beaters mounted opposite each other within said chamber in planes having upwardly-
receding inclinations with relation one to the other, and suitable means for rotating
the said heads, whereby the fragments are caused to move vertically, substantially as
described.
Second. In a machine for reducing ores and the like by impact and attrition
between the fragments, comprising a reducing chamber, two oppositely-rotatable
heads or beaters mounted opposite each other within said chamber in planes having
upwardly receding inclinations with relation one to the other, and having radial
curved ribs, and suitable means for rotating the said heads, whereby the fragments
are caused to move vertically, substantially as described.
Third. In a machine for reducing ores, and the like by impact and attrition between
the fragments, comprising a reducing chamber, two oppositely-rotatable heads or
beaters having concave adjacent surfaces and curved radial ribs mounted opposite
each other within said chamber in planes having upwardly-receding inclinations with
relation one to the other, and suitable means for rotating said heads, whereby the
fragments are caused to move vertically, substantially as described.
Dated this 24th day of October 1888.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.