Improvements in Pulverizing Machines
Year: 1898

page_text: Date of Application, 15th Oct., 1898
Complete Specification Left, 30th June, 1879-Accepted, 5th Aug., 1899
[Communicated from abroad by JOHN RICHARD LAMPLOUGH, of Johannesburg,
in the Republic of South Africa.]
Improvements in Pulverizing Machines,
I, HENRY HARRIS LAKE of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
This invention relates to pulverizing machines, more particularly of that
class used for reducing gold bearing or other metalliferous ores preparatory to
further treatment of the same and is designed to produce a highly efficient
machine for the purpose of a comparatively small size requiring little power for
driving and consequently much cheaper, both in construction and in working,
than the ordinary stamp mill at present in general use.
It consists of a closed horizontal chamber of cylindrical form, bolted to a bed
plate constructed of cast iron or other suitable material, and provided on its
inner periphery with a series of alternate transverse recesses and projections
or corrugations, formed in a direction parallel with the axis of the cylindrical
chamber. This chamber is preferably constructed in two or more parts hinged
together so that it may be opened up to allow of repairs being effected when
necessary. These two parts at their points of contact are formed with flanges
so as to be firmly secured together by bolts. Within this chamber, two or more
arms, provided at their extremities with adjustable and removable hardened
shoes, are mounted on a shaft or spindle working horizontally and passing
through the ends of the chamber, where it is supported in suitable bearings, and
to either end of which a pulley may be keyed for the purpose of imparting the
necessary motion, or it may, if desirable, be driven by suitable gearing.
The shoes on the revolving arms are so adjusted that their ends just clear
the projections or corrugations on the inside of the chamber.
A hopper is provided at one or both sides of the chamber as may be found con-
venient through which the ore or rock to be reduced or pulverized is introduced
into the machine.
A shoot or outlet is fitted into an opening formed in the rim or periphery of
the chamber through which the pulverized ore or rock is discharged, the mouth
of which is furnished with a screen of any desired mesh according to the size
to which it is desired to pulverize the rock. This shoot or outlet is fitted to the
machine so that the discharge shall preferably be in an upward direction, the
object being to allow those particles which are too coarse to pass through the mesh,
to fall back into the machine to be further reduced.
I find it advantageous in some cases to construct this shoot so that the screen-
ing is fixed not at the mouth as above described but so as to divide the shoot
longitudinally into two parts; the shoot being so arranged that the pulverized
ore which has passed through the screening falls on to the bottom of the shoot

page_text: whence it is conducted to any suitable appliance for extracting the precious
metal contained therein.
The revolving arms within the casing or chamber may either be secured
rigidly to the driving shaft or spindle on which they are mounted as herein-
before described, or may be pivoted to a boss mounted on the said spindle, and
controlled by springs, the object of this latter arrangement being to give a
certain amount of play to the arms when revolving in order to prevent the possi-
bility of damage to the machine should some material, of harder texture than
the ore (c.g. a piece of iron) be accidentally introduced therein.
The transverse projections or corrugations instead of being cast solid on the
inner periphery of the chamber as aforementioned, may be formed on bars or
plates, which may be secured by bolts, or by other suitable means, to the inside
of the chamber so as to be readily replaced when worn out.
The operation of the machine is as follows:-
Motion having been imparted to the machine through the pulley thereby
causing the radial arms to rapidly revolve, ore is fed through the hopper into the
chamber formed by the circular casing and its covers and is rapidly reduced or
pulverized by the hardened shoes which, as they revolve, just clear the nearest
points of the transverse projections or corrugations. The degree of fineness in
crushing may be regulated as required by adjusting the shoes.
The pulverized ore is forced by the natural draught of the arms revolving at
a great speed, through the shoot and against the screening. This shoot is con-
structed as before mentioned, in an upward direction so that any particles which
may be too coarse to pass through the screening tend naturally to fall back of
their own weight into the machine to be further reduced.
Dated this 15th day of October 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
improvements in fulverizing machines.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, 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 pulverizing machines, more particularly of that
class used for reducing gold bearing or other metalliferous ores preparatory to
further treatment of the same and is designed to produce a highly efficient
machine for the purpose of a comparatively small size requiring little power for
driving and consequently much cheaper, both in construction and in working,
than the ordinary stamp mill at present in general use.
It consists of a closed horizontal chamber of cylindrical form, bolted to a bed
plate constructed of cast iron or other suitable material, and provided on its
inner periphery with a series of alternate transverse recesses and projections
or corrugations, formed in a direction parallel with the axis of the cylindrical
chamber. This chamber is preferably constructed in two or more parts so that
it may be opened up to allow of repairs being effected when necessary. Within
this chamber, two or more arms, provided at their extremities with adjustable
and removable hardened shoes, are mounted on a shaft or spindle working hori-

page_text: zontally and passing through the ends of the chamber, where it is supported in
suitable bearings, and to either end of which a pulley may be keyed for the pur-
pose of imparting the necessary motion, or it may, if desirable, be driven by
suitable gearing.
The shoes on the revolving arms are so adjusted that their ends just clear
the projections or corrugations on the inside of the chamber.
A hopper is provided at one or both sides of the chamber as may be found con-
venient through which the ore or rock to be reduced or pulverized is introduced
into the machine.
A shoot or outlet is fitted into an opening formed in the rim or periphery of
the chamber through which the pulverized ore is discharged, the mouth
of which is furnished with a screen of any desired mesh according to the size
to which it is desired to pulverize the rock. This shoot or outlet is fitted to the
machine so that the discharge shall, preferably be in an upward direction, the
object being to allow those particles which are too coarse to pass through the mesh,
to fall back into the machine to be further reduced.
I find it advantageous in some cases to construct this shoot so that the screen-
ing is fixed not at the mouth as above described but so as to divide the shoot
longitudinally into two parts; the shoot being so arranged that the pulverized
ore which has passed through the screening falls on to the bottom of the shoot
whence it is conducted to any suitable appliance for extracting the precious
metal contained therein.
The revolving arms within the casing or chamber may either be secured
rigidly to the driving shaft or spindle on which they are mounted as herein-
before described, or may be pivoted to a boss mounted on the said spindle, and
controlled. by springs, the object of this latter arrangement being to give a
certain amount of play to the arms when revolving in order to prevent the possi-
bility of damage to the machine should some material, of harder texture than
the ore (e.g. a piece of iron) be accidentally introduced therein.
The transverse projections or corrugations instead of being cast solid on the
inner periphery of the chamber as aforementioned, may be formed on bars or
plates, which may be secured by bolts, or by other suitable means, to the inside
of the chamber so as to be readily replaced when worn out.
My invention will be more readily understood on referring to the accompany-
ing drawings, in which:-
Fig. 1 shews a side view of the machine.
Fig. 2 shews an end view.
Fig. 3 shews a section through the machine.
Fig. 4 shews a transverse section.
Fig. 5 shews a section through the machine upon line -- Figure 6, shewing
revolving arms pivoted instead of fixed.
Fig. 6 shews a plan view of the same partly sectional.
Fig. 7 shews a sectional elevation through the machine.
A is a circular casing of cast iron or other suitable material, the inner
periphery of which is constructed with transverse alternate projections and
recesses or corrugations B B as shewn. CC are covers bolted to either end
of the circular casing A (Figs. 4 and 6).
The chamber thus formed is shewn in the accompanying drawings constructed
in two halves hinged together at 0, so that the chamber may be readily opened'
to admit of repairs being effected and the working parts replaced; these two
halves at their points of contact are formed with flanges so as to be firmly secured
together by the bolts R R (Fig. 1). D is a spindle carried in suitable bear-
ings EE to which motion may be imparted through the pulley F as shewn in
Figs. 4 and 6. G G are radial arms keyed or otherwise secured to the said
spindle D and are constructed at their extremities so that the removable anil
adjustable shoes H H may be firmly secured by means of bolts or other suitable
means (in the accompanying drawings, the shoes H H are shewn provided with

page_text: dovetail grooves fitting into counterparts formed in the arms G G). K is a
hopper leading into the chamber A. through which ore is fed when the machine
is in operation.
M is a discharge shoot leading from the chamber A as shewn and is provided
at its mouth with a frame to hold screening of any mesh as may be desired.
In Figs. 5 and 6, a modified arrangement of revolving arms G G is shewn,
whereby they are not rigidly attached to the spindle D (as in Figs. 3 and 4) but
are loosely pivoted to a boss P' which, in turn, is keyed or otherwise secured to
the spindle D. These arms are controlled by the springs R¹ R¹ bolted to the
said boss P. This arrangement gives a certain amount of play to the arms when
in operation, and prevents the possibility of damage to the machine through the
accidental introduction of any substance harder than the ore which the apparatus
is designed to treat and which, in the case of fixed arms, might cause great
damage to the working parts.
In Fig. 7a modified form of discharge shoot M is shewn. The screening N
divides the said shoot M longitudinally into two parts, so that a larger surface of
screening is presented to the pulverized ore. It will also be seen that the trans-
verse projections B B and the shoes H, H are of a different construction, the
machine, however, remaining the same in every other respect.
METHOD OF WORKING.
Motion having been imparted to the machine through the pulley F driven by
a belt moving in the direction shown by the arrows Fig. 1 thereby causing the
radial arms G G to rapidly revolve, ore is fed through the hopper K into the
chamber formed by the circular casing A. and its covers C C and is rapidly re-
duced or pulverized by the hardened shoes H H which, as they revolve, just
clear the nearest points of the transverse projections or corrugations B. The
degree of fineness in crushing may be regulated as required by adjusting the
shoes H H.
The pulverized ore is forced by the natural draught of the arms G G revolving
at their great speed, through the shoot M and against the screening N. This
shoot is constructed as before mentioned, in an upward direction so that any
particles which may be too coarse to pass through the screening tend naturally
to fall back of their own weight into the machine to be further reduced.
The course taken by the material under treatment is shown by arrows in the
several figures.
Having now particularly described and ascertained the nature of my said in-
vention and the manner in which the same is to be performed as communicated
to me by my foreign correspondent I declare that what I claim is:
1. An improved pulverizing machine for the reduction of ores and the like
consisting of the combination of a circular casing A with the covers C C and
provided on its inner periphery with a series of transverse projections or corru-
gations BB, the radial arms G G mounted on the spindle D, fitted with adjust-
able and removable shoes H H and the upwardly inclined discharge shoot M,
substantially as herein before described and illustrated in Figs. 3 and 4 of the
accompanying drawings.
2. An improved pulverizing machine for the reduction of ores and the like
consisting of the combination of a circular casing A with the covers CC and
provided on its inner periphery with a series of transverse projections or corru-
gations B B, the radial arms G G pivoted to a boss P which is keyed to a
spindle I), said arms G G being controlled by the springs R R¹, and the up-
wardly inclined discharge shoot M, substantially as herein before described and
illustrated in Figs. 5 and 6 of the accompanying drawings.
3. In an improved pulverizing machine for the reduction of ores and the like,
in combination the circular casing A with the projections or corrugations B B
formed on its inner periphery, the radial arms G G either rigidly fixed to a

page_text: spindle D (as shown in Figs. 3 and 4) or pivoted to a boss P and controlled by the
springs R R (as in Figs. 5 and 6) and the upwardly inclined discharge
shoot M with a screen N dividing said shoot longitudinally, substantially as
herein before described and illustrated in Fig. 7 of the accompanying drawings.
Dated this 29th day of June 1899.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.