Improvements in or applicable to Stamp-batteries.
Year: 1895

page_text: Date of Application, 4th July, 1895.
Complete Specification Left, 31st Mar., 1896-Accepted, 3rd Oct.,.
1896
PROVISIONAL DE EGIN ALLON..
Improvements in or applicable to Stamp-batteries.
I, GEORGE GATTON MELHUISH HARDINGHAM, of 191, Fleet Street, in the
City of London, Civil. Engineer and Chartered: Patent Agent, do hereby declare
the nature of this, invention (a communication from Charles Raleigh, of Johannes-
burg, in the South. African Republic, Milling Engineer,) to be as follows::-
This invention relates to stamp-batteries, adapted for use in crushing ores and
the like, and consists of certain improvements designed to render such apparatus
more efficient and reliable in action and to facilitate the carrying out of' renovations
when, such become necessary.
In stamp-heads as ordinarily constructed, in the event of the stem becoming
detached, the head usually drops off and gets ont of alignment with the stem, with
the result that the latter, on striking the top of the head, suffers injury, if it does
not actually split the head. Instead of making the hole iu the top of the head, of a
depth only just sufficient for the proper holding of the stem, the depth of the hole
is, according to the improved mode of construction, increased beyond the proposed
height of lift of the stamp ; so that, in the event of the head becoming detached,
the stem rises in the hole without escaping therefrom, the stem at its next drop
re-securing itself in the head.
In constructing a head according to the present invention, a parallel; or cylindrical
hole of sufficient diameter to afford clearance to the stem is first bored in the top of
the head. In the bottom of this cylindrical hole, the taper hole for holding the
stem is formed; the distance between the top of the parallel hole and the bottom
of the taper hole being somewhat greater than the maximum lift of the stamp, the
hole being of such a depth.. as to prevent the stem coming entirely out of
the head.
The
If desired, when making new heads and stems, the above result may be obtained
by lengthening the taper on the stem, and forming a correspondingly lengthened
taper hole in the head; but this arrangement somewhat weakens the stem.
improved head offers an advantage in respect of having a larger mass of metal
around the parallel hole, thus preventing the head splitting at the point where the
taper hole commences.. A ring of rubber,, preferably fitted in a cone-shaped
recess to ensure its retaining its position,, may line the parallel hole, so as to
embrace the stem and absorb vibration.
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For securing the cams to the cam-shaft,, it has hitherto been the practice to cut
keyways in the cam-shaft and in the cams, parallel to the axis: of the said shaft.
According to this invention, a recess is made in the bore of the cam, and into this
recess is fitted a gib. The gib is furnished with studs or longitudinal projections,
which engage in corresponding recesses formed in the cam-shaft; the upper surface
of the gib being horizontal or inclined. The gib is forced, into position on the
shaft by means of a key or keys or cotters, which may be wedge-shaped. The key
or cotter is inserted from the outside of the cam, in contact with the upper surface
of the gib. The studs or projections prevent the cam "starting," and the gib is
held firmly to the shaft by the key or keys.
To diminish vibration, which entails rapid wear and sometimes results in the
breakage of the stems, buffers of rubber are fastened on the stem-rods, cam-shafts,
heads, and similar parts, with a view to absorbing or deadening the vibration.

page_text: A loose circular washer of rubber may also be placed on the shank of the shoe; so
that, when the latter is placed in the head, the rubber comes between the shoe and
the head.
To prevent the tappits slipping and to facilitate "setting," a thread is cut
on the portion of the stem where the tappit is likely to be fastened; a corre-
sponding thread being cut on the gib of the tappit. The purpose of the thread on
the stem is not to hold the tappit in position when working, but to hold the tappit
temporarily when the keys are loosened for the purpose of altering the "drop.'
When it is required to take a tappit off the stem, the keys are loosened and the gib
allowed to retreat, the threads of the latter being thereby disengaged from the
threads of the stem, and the tappit rendered free to slide up or down. Heretofore
stems and tappits have been made with threads cut on them, so that the tappit
screwed up or down, the same being secured in position by a lock nut or similar
means; but under these circumstances, the tappit was dependent on the threads for
a hold, and it was necessary to screw the tappit entirely off in order to take out a
stem. In the improved construction, only the gib of the tappit is screwed;
the
office of the shallow thread on the stem being to hold the dead weight of the tappit
whilst the latter is being "set."
Instead of employing keys to secure the gib in position, two or more hollow studs
may be used; the hollows being square for the purpose of receiving a square ended
male spanner for tightening the studs against the gib. The studs, when screwed
in, do not project beyond the diameter of the tappit. The construction of tappits
and stems above described permits the setting of the tappits to be accomplished by
one man, without his even having to lift the stamps.
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To enable shoes to be worn out entirely and to compensate for loss of weight
consequent on wear, a "chuck-shoe constructed in the following manner is
employed-The top of the chuck-shoe is furnished with a projection similar to an
ordinary shoe the bottom being provided with a recess for the reception of the
projection formed on the top of the shoe. A hole is formed through the chuck-shoe
for the insertion of a bar for driving out the shoe when the latter sticks. When in
use, the chuck-shoe occupies a position between the ordinary head and the worn shoe.
By this means a worn or diminutive head shoe, may be made to weigh nearly as
much as a shoe of normal character.
Dated the 4th day of Jule 1805
J, GEORGE GATTON MELHUISH HARDINGHAM, of 191, Fleet Street, in the
City of London, Civil Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention (a communication from Charles Raleigh, of
Johannesburg, in the South African Republic, Milling Engineer,) 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 stamp-batteries, adapted for use in crushing ores and
the like, and consists of certain improvements designed to render such apparatus
more efficient and reliable in action and to facilitate the carrying out of renovations
when such become necessary.
In the accompanying drawings,
Fig. is a vertical section of a "head," such as employed in stamp-batteries,
embodying my improvements;
Fig. 2 being a side view, Fig. 3 a plan and Fig. 4 a view looking at the under
side of the head.

page_text: Fig. 5 is a fragmentary view of a head in which a ring of rubber encircles the
stem for the purpose of absorbing vibration.
Fig. 6 is a transverse section of the cam-shaft showing my improved mode.
of securing the cams thereto.
Fig. 7 is a corresponding end view.
Fig. 8 is a vertical section and Fig. 9 a transverse section of the improved.
means for securing tappets.
Fig. 10 is a view, partly in section, of a "chuck-shoe" for employment in utilising
worn shoes.
Fig. 11 is an elevation of a stamp-head embodying a chuck-shoe and a diminutive
or worn shoe.
In stamp-heads as ordinarily constructed, in the event of the stem becoming
detached, the head usually drops off and gets out of alignment with the stem, with
the result that the latter, on striking the top of the head, suffers injury, if it does
not actually split the head. Instead of making the hole in the top of the head of
a depth only just sufficient for the proper holding of the stem, the depth of the hole
is, according to the improved mode of construction, increased beyond the proposed
height of lift of the stamp; so that, in the event of the head becoming detached,
the stem rises in the hole without escaping therefrom, the stem at its next drop
re-securing itself in the head.
In constructing a head (A) according to the present invention, a parallel hole a
of sufficient diameter to afford clearance to the stem (B) is first bored in the top
of the head. In the bottom of this parallel hole, the taper hole 6 for holding the
stem is formed; the distance between the top of the parallel hole and the bottom
of the taper hole being somewhat greater than the inaximum lift of the stamp.
The hole (a, b) is of such a depth that the stem is prevented coming entirely out of
the head.
In making new heads and stems, a like result may be obtained by extending the
taper over a greater length of the stem and forming a correspondingly lengthened
taper hole in the head; but this arrangement somewhat weakens the stem.
1
The improved head offers an advantage in respect of having a larger mass of
metal around the arallel hole, thus preventing the head splitting at the point
where the taper hole commences. The parallel hole may if desired be lined with a
ring of rubber a¹ (Fig. 5), preferably fitted in a cone-shaped recess to ensure its
retaining its position, vibration being thereby absorbed.
c is the taper recess for receiving the conical shank of the shoe (shown dotted in
Figs. 1 and 2). The passages a², a³, through the head A, are for the insertion of
a drift or bar for use in detaching the head from the stem or the shoe from the
head.
the
For securing the cams to their cam-shaft, it has hitherto been the practice to cut
key-ways in the cam-shaft and in the cams, parallel to the axis of the said shaft.
According to the present invention, a recess d is made in the bore of the cam C,
and into this recess is fitted a gib e. The gib is furnished with studs or longitudinal
projections which engage in corresponding recesses g formed in the cam-shaft D;
upper surface of the gib being horizontal or inclined. The gib is forced into
position on the shaft by means of a key h or keys, or by cotters, which may be
wedge-shaped. The key or cotter is inserted from the outside of the cam C, in
contact with the upper surface of the gib e. The studs or projections on the gib
prevent the cam starting," and the gib is held firmly to the shaft by the key
or keys h.
To diminish the vibration in the stamp-battery, which entails rapid wearing of
the parts, and sometimes results in the breakage of the stems, buffers of rubber or
like material may be applied to the stem-rods, heads and other parts. By way
of example, a loose circular washer of rubber may be placed on the shank of the
shoe, as shewn at m Figs. 1 and 2; so that, when the latter is placed in the head,
the rubber comes between the shoe and the head.
In order to prevent the tappets slipping and to facilitate "setting" them, a

page_text: thread or series of grooves n (Figs. 7 and 8) is cut in the portion of the stem B
where the tappet G is likely to be fastened; a corresponding thread o being cut on
the gib p of the tappet. The purpose of the thread on the stem is not to hold the
tappet in position when working, but to hold the tappet temporarily when the keys q
are loosened for the purpose of altering the "drop." When it is required to take
a tappet off the stem, the keys 9 are loosened and the gib allowed to retreat, the
threads o of the latter being thereby disengaged from the threads n of the stem,
and the tappet rendered free to slide up or down.
Heretofore stems and tappets have been made with threads cut on them, so that
the tappet screwed up or down, the same being secured in position by a lock-nut or
similar means; but under these circumstances, the tappet was dependent on the
threads for a hold, and it was necessary to screw the tappet entirely off in order to
take out a stem.
In the improved construction, only the gib of the tappet is screwed or grooved;
the office of the shallow thread or grooves on the stem being to hold the dead
weight of the tappet whilst the latter is being "set."
Instead of employing keys to secure the gib in position, two or more studs may
be used; their outer extremities being suitably formed to admit a key whereby
they may be tightened against the gib. The studs, when screwed in, do not project
beyond the diameter of the tappet. The construction of tappets and stems above
described permits the "setting" of the tappets to be accomplished by one man,
without his even having to lift the stamps.
"
Referring to Figs. 10 and 11, to enable "shoes to be worn out entirely and to
compensate for loss of weight consequent on wear, a "chuck-shoe " E, constructed
in the following manner, is employed :-The top of the chuck-shoe is furnished
with a projection or shauk i, similar to the ordinary shoe; the bottom being
provided with a recess k for the reception of the projection formed on the top of
the shoe F. A bole or passage is formed through the chuck-shoe E for the
When in use
insertion of a bar for driving out the shoe F when the latter sticks.
(as shown in Fig. 11), the chuck-shoe E occupies a position between the ordinary
head A and the worn ordinary shoe F. By this means, the weight of a worn shoe
may be made up to, or nearly to, that of a shoe of normal character.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I claim: -
1. The improved construction of stamp-head, substantially as herein described,
whereby the stem is prevented retreating entirely from the head and risk of fracture
of the latter is diminished.
2. A stamp-head in which the hole for the reception of the stem is formed with
a parallel entrance and a taper lower portion; the total depth of said hole being
in excess of the lift of the stamp, substantially as and for the purpose set forth.
3. In a stamp-head of the character referred to in the preceding claiming clause,
the employment of a ring of rubber for absorbing vibration, same being fitted into
a cone-shaped recess in the head and forming the parallel portion of the hole in
which the stem is housed, substantially as herein described.
4. In a stamp-battery, the improved method of fastening the cams to their shaft,
substantially as described with reference to Figs. 6 and 7 of the accompanying
drawings.
5. For securing a cam to its shaft, a gib having a stud or studs or feather
engaging in a recess or recesses in the cam-shaft and held in position by a key or
keys or cotter; a suitable recess and key-way or key-ways being formed in the
cam for the reception of the gib and keys, substantially as herein described.
6. In stamp-batteries, the employment in connection with certain parts of the
apparatus, such as the stem-rods or beads, of buffers or rings of rubber or similar
material, substantially as and for the purpose herein set forth.
7. For preventing tappets slipping and for facilitating their "setting," the
employment of a gib having threads arranged to engage with corresponding threads

page_text: on the stem situate at a point where the tappet is required to be set, the gib being
tightened against the stem by means of keys or studs, substantially as herein.
described.
8. For use with stamp-heads, a "chuck-shoe," constructed substantially as
described with reference to Figs. 10 and 11 of the accompanying drawings and for
the purpose set forth.
Dated this 31st day of March 1906
G. G. M. HARDINGHAM.