Improvements in Stamping or Orushing Mills.
Year: 1895

page_text: Date of Application, 7th May, 1895-Accepted, 10th Aug., 1995
COMPLETE SPECIFICATION.
Improvements in Stamping or Orushing Mills.
I, GEORGE MICHAEL GROSS, of 2117 Slate Street, Chicago, in the County of
Cook and State of Illinois, United States of America, Manufacturer, 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 that class of stamp mills, in which the stamp head 18
lifted by a cam, and falls by gravity alone, or gravity assisted by the elasticity of
a spring to crush the ore or other material contained within the mortar box, and
also to that particular type of stamp batteries in which a number of stamp Leads
are arranged in a concentric cluster, and drop in a successive manner during the
crushing or stamping operation
And the present improvements have for their objects; to provide a simple and
efficient means for attaining a positive and differential revolution in the same
direction of the concentrically arranged lifting cam and cam tappet of a stamp mill,
to effect a continuous change of the face of the stamp head, with relation to the
face of its stationary anvil block or die, and so attain an even and uniform wearing
away of the stamp head, etc, during continuous use.
Also to provide a simple and durable means for increasing or diminishing at will,
the force or unpact of the same hends in their down stroke, and in which such
downwardly impelling means for the stamp heads, is capable of adjustment to
compensate for wear upon the stamp head by continued use
And finally to provide a simple and durable general construction and arrangement
of a cluster stamp battery embodying the features of the usual stamping action,
supplemented by a grinding action, due to a positive rotation of the stamp heads;
a yielding connection between the stamp steins and their operating cam mechanism,
that takes up in a great measure the jai upon the operating mechanism, due to the
rebound from the downward impact of the stamp head, and which at the same time
tends to force the face of the stamp head downwardly in a yielding manner during
the gunding or milling action of the same upon the ore under treatment, a simple
and durable adjustment of the stamp stems downwardly with relation to their
operating cam mechanisms, to compensate for wear of the stamp head by continued
use, and an effective and substantial attachment of the individual stamp heads and
operating cam mechanisms in proper positions, in a manner that admits of the ready
and convement detachment and replacement of any one stamp head and its
individual operating cam mechanism, in making repairs, without disturbing in the
feast, the functions or actions of the remaining stamps
attain such objects by the construction and arrangement of parts illustrated in
the accompanying drawings, in which
Figme 1, is a perspective view of a cluster stamp mill, illustrating a simple or
rudimentary type of the present invention
Figure 2, is a vertical sectional elevation of a cluster stamp mill, or battery,
constructed in accordance with the present invention;
Figure 3, an enlarged detail sectional elevation of the lifting cain, cam tappet,
and stamp head stem;
Figures 4, 5 and 6, horizontal sections at lines, x-x', x'—x³, x²—³, respectively,
Figure 2
Similar numerals of reference, indicate like parts in the several views.

page_text: As represented in the drawings the main supporting frame of the mill, consists
of a single upright or post 1, at one side, and a pan of uprights or posts 2, at the
other side, which are firmly connected together by the horizontal tie members, 3.4,
and 5, that have a bifurcated or Y formation, and which are proferably made in the
form of castings, and provided with suitable flanges, by means of which they are
Recmely bolted to the posts 1 and 2, to constitute a rigid and substantial supporting
frame, for the mill mechanism.
At bottom the posts 1 and 2, are bolted to the sules of the base or bottom
casting 6, that receives and holds the stationary stamp dies 7, and constitutes the
bottom of the mortar box,
8, are the stamp heads, having the usual guide stems 9, by which they are guided
in their vertical reciprocating movement
10, are the lifting cams, and 11, the guide stems tappets.
In the present invention a series of individual stamps, lift cams nud tappets, are
ariauged in a cucular cluster, concentric with the main driving shaft 12, that
carries a spur gear 13, which meshes with and drives the series of spur gears 14,
that are attached to and form a portion of the lifting cams 10
Each individual stamp lifting cam 10, 18 of a cylindrical form, arranged to
surround the individual stamp stem 9, and conuected thereto, by means of a key or
spline 15, secured in the axial bore of the cams an adapted to have movement in
the vortically extending koyway or groove 16, in the stamp stem, so as to admit of
the independent vertical reciprocation of such stem, and yet impart the same rotary
uution to such stem and its stamp head, that is received by such cam from the main
driving shaft, and the eam portion proper of the oam 13 in the form of au upwardly
extending annular rim 101, tbat is cut away spially to form the spinally inclined
lifting face of the cam, that proferably extends around the whole circular surface
of the rim, to constitute a single lift cam, so that with each complote revolution of
the said cami, a single stroke will be imprited to the stamp head
In order that the portion of the stanip stem, in which is formed the keyway 16,
will not at any time pass out of the cam bore and enter the guide box immediately
underneath, the body of the cam 18 extended downwards, a sufhcient distance, in
the form of a hub extension 10", either separate on integral, that rests directly above
the aforesaid guide box 17, and on the top surface of the lower horizontal tie
inember 5, to support the aforesaid eam in operative position
Each individual cam tappet 11, of the stamp stems will preferably be of a
counterpart construction, with the lifting cims I, aud will consist of a body portion
surrounding the stamp stem 9, and a downwardly extending tim portion 11', that
18 cut away spally, so as to have a umform bearing upon the adjacent spiral
lifting taco of the lifting cam 10
Each tappet has an upward extension 11", the outer periphery of which, is of a
non circular shape, preferably square as shown, that is adapted to have an indepen-
lent end wise vertical movement, in the guide box 18, on the intermediate horizontal
the member 4, but held from any rotary movement in lependent of such box, such
bex 18, may be made a fixture on the member 4 as shown in Figure 1, but it is
preferable to make it evoluble, as will hereinafter more fully appea
Each stamp stem 9, is free to revolve independently of its cam tappet, but in le-
pendent vertical end wise movement of the two, s prevented by means of the top
and bottom confining collars 19 and 20, secmed to the stamp stem 9, above and
below the cam tappet, as shown
In the present improved construction, these collars are made adjustable on
the stamp stem, so that said stamp stem can be let down through the cams, to
compensate for wear of the stamp head in continued use. In this
21, are a vertical series of notches at each side of the stump stem, placed, say one such
apart, and 22, are voitical pairs of counter part notches or orifices, through the
collais 19 and 20, placed one and one half inches apart, so that when one pair of the
onfices 22, are in line with a pair of the notches 21, in the stamp stem, to receive
the pan of connecting pins or gibs 23, the other pair of the onthees 22, will be one

page_text: half of an inch away, from the next adjacent pair of the notches 21, of the stamp
stem, by this means successive adjustments of one half inch each can be readily
And it is
effected to compensato for wear of the stamp head by continued use
quite evident that a great or less adjustment may be effected by a nearer or
further apart arrangement of the series of notches and orifices 21 and 22.
24, 16 a spring cushion interposed between the lower collar 20, and the under
surface of the body of the tappet 11, so as to admit of a limited independent
vertical movement, between the parts in use, and constitute a yielding connection
at that point, that will absorb in a great measure the jai upon the cams, and
other operating parts, due to the rebound from the downward impact of the stamp
head, and which at the same time acts to force the face of the stamp head, down-
ward in a yielding manner, during the gunding or milling action, of the same upon
the one under treatment
The cluster of stamps will be usually five in number, and the same will be
supported and guided in proper position by the guide boxes 17 and 18, on the
vertical and outer faces of the intermediate and lower horizontal the members 4
and 5 of the man frame, and as so arranged permits of the ready removal and
replacement of any oue stamp and its individual connections, in making repairs,
without disturbing in the least, the action of function of the remaining stamps
In my preferred arrangement, as illustrated in Figures 2, 3, and 4, of the
drawings, I, arrange the guide boxes 18, of the cam tappet to have differentially
slower motion than the operating cams and stamps, and in the same direction, so as
to effect a change at each stroke of the stamp heads, of the face of such beads with
relation to the face of then dies, by giving an advancing part turn to Buch heids
In this constinction, the gunde boxes are journalled to revolve in the intermediato
borizontal the piece 4, and are provided with concentric spur gears 25, that form a
cluster around and mesh with a central driving spur gear 26, that is arranged upon
a hollow shaft 27, surrounding the main vertical shaft 12.
Motion is communicated to the hollow shaft 24, in any suitable manner, preferably
by means of a horizontal counter shaft 28, carrying at its inner end a bevel
gea 29, meshing with a bevel gear 30, on the hollow shaft, and at its outer end
provided with a chain or other pulley 31, connected to and driven by a corre-
sponding chain or other pinion 32, on the main driving shaft 33, of the machine, aud
which will be usually be arranged in suitable boxes at the top of the mill, and
connected to the vertical diving shaft 12, by means of a pan of bevel gears as
shown The driving shaft 12, is supported at its lower end in a step bearing at its
central portion of the lower horizontal tie member 5, as shown.
The relative diameter of the chain wheel 31, and the chain pimion 32, will
regulate the slower revolutions of the cam tappet, with relation to the revolution of
the operating cam, and will afford a ready means for changing such relative
rotations, by substituting chain wheels and pinions of the required relativo
diameters
The mortar box 34, sun rounding and enclosing the cucular cluster of stamp heads
will be of any usual construction, having its sales provided with the usual
detachable pulp screens, 35 and its top with the usual feed hopper 36.
37, 18 a top plate that may form preferably the top or cover of the mortar box,
and which plate in the present invention is arranged a short distance below the
horizontal lower tie member 5, and provided with upturned marginal flanges 38, s0
as to form a waste receiving recess, or chamber that is packed with cotton or other
waste.
This waste surrounds the cluster of stamp stems, and constitutes a wiper therefor,
So as to prevent the passage of any oil or lubucant down from the guide boxes into
the mortar boxes
59, is an annular pulp collecting trough, at the bottom of the mill or battery, for
receiving the pulp discharged through the screens, of the mortal box, in the
operation of the stamp battery.
The cluster stamp battery so far described, constitute a very efficient drop

page_text: battery, and in larger sizes be usually be so constructed, but, in the smaller sizes of
tamp batteries, such for instance, as prospecting mills, in which great lightness
combined with crushing capacity is a very desirable feature, springs for accelerating
the down stroke of the stamp heads, will be used.
In the present invention these springs 40, usually of a conical shaped volute
form, will be attached by means of the turning heads 41, to the upper ends of the
stamp stems 9, so that the turning movement of said stems may take place
independently of such springs.
42, is a vertically adjustable head arranged above the springs, 40, and in the path
thereof, so that as said springs are raised in the upper movement of the stamp stems,
the springs will be first brought in contact with said heads 42, and theu compressed
against the same, so that as the stamp stems begin to descend, the force stored up
in such springs will be brought into action, to impart an accelerated downward
stroke to such stems, and the stamp heads at the lower end of the same.
To vary the amount of compression, as well as to compensate for the descent of
the stamp stem, etc., due to gradual wear of the stamp head in use, the spring
abutment head 42, 18 male vertically adjustable upon the main uprights, or posts 1
nud 2, by means of intchet bars 43, secured thereto, ratchet dogs 44, on the top of
the abutment head 42, and clamping bolts 45, that hold the ratchet dogs 44, and
ratchet bars 43, at any desired adjustment, to which they may be set
Having now particularly described and ascertained the nature of this inven-
tion and in what inauner the same is to be performed I declare that what I
clann 18
1 A stamp mill comprising in combination, a reciprocating stem cairying n
stamp head, a cam tappet secured to the stamp stem, an actuating can having an
annularly airanged cami face and adapted to revolve around the axis of stamp stem,
independent of the reciprocation of the same, and means for imparting a differential
1otation to the can and cam tappet in the same direction, substantially as set
forth.
2. A cluster stamp mill, comprising in combination, a series of dies, a series of
reciprocating stamp heads and stems, a series of cam tappets secured to stamp stem²,
a series of actuating cams, having annularly aanged cam faces, and adapted to
revolve around the axis of the stamp steins, independently of the reciprocation of
the same, and means for unpaiting a differential and continuous rotation to the cams
and cam tappets in the same direction, the same consisting of the centially
arranged driving shafts, 12 and 27, each cariying a spur gear 13, 26, the duplicate
cluster of spur gears 14, 25, attached to the cam and cam tappet and means for
imparting differential rotation to the shafts 12, and 27, substantially as set
forth.
3 A stamp mill, comprising in combination, a dic, a reciprocating stem carrying
stamp head, a cam tappet secured to the stamp stem, a hitting cam for the same, a
spring carried by the stamp stem, and an adjustable abutment plate arranged in the
path of the spring, substantially as set forth.
4. A stamp mill, comprising in combination, a die, a reciprocating stamp head
and stem, an operating cam, a cam tappet seca ed in place by means of collars 19
and 20, and a cushion 24, interposed between the colla 20, and the under side of
the cam tappet, substantially as set forth.
5. A stamp mill, comprising in combination, a die, reciprocating stamp head and
stem, an operating cam, a cam tappet secured in place by means of collars 19 and 20,
a cushion 24, interposed between the collar 20, and the under side of the cam tappet,
the stamp stem being made vertically adjustable with relation to the cam tappet by
means of the pin 23, the series of notches 21, in the stein, and the vertical pair of
ofices 22, in the collars 19 and 20, the orifices 22, being further apart from the
notches 21, substantially as set forth.
6. A cluster stamp mill, comprising in combination, a centrally arranged driving
shait, a cluster of stamp heads and stems, a ranged concentrically therewith, a series

page_text: of lifting cams and tappets individual to the series of stamps, and means for
imparting motion from the central driving shaft, to the series of cams, substantially
as set forth
7. A cluster stamp mill, comprising in combination, a main supporting frame, a
centrally arranged driving shaft, a cluster of stamp heads and stems arranged
concentrically therewith, a series of cam tuppets secured to the stamp stems, means
whereby such tappets are held from rotating with the stems, a series of lifting cams,
connected to the stamp stems by a key and keyway, so as to admit of the
independent reciprocation of such stems, and means for imparting motion from the
central diving shaft, to the series of came, substantially as set forth
8. A cluster stamp mill, comprising in combination, a main supporting frame, a
centrally arranged diving shaft, a cluster of stamp heads and stems arranged
concentrically therewith, a series of cam tappets secured to the stamp stems by
means of collars 19 and 20, means whereby such tappets are held from rotating with
the stamp stems, cushions 24, interposed between the collars and the under side of
the tappets, a Bories of lifting cains connected to the stamp steins by a key and key-
way, so as to admit of the independent reciprocation of such stems, and means for
imparting motion from the central diving shaft to the series of cams, substantially
as set forth.
Dated this 7th day of May 1895
HERBERT HADDAN & Co,
18 Buckingham Street, Strand, London, W.C.,
Agents to Applicant.