Improvements in the Guide-blocks of Stamp-mills.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Guide-blocks of Stamp-mills.
We, RICHARD SHEPHERD, Millwright, and REGINALD GRYLLS THOMAS, Mining
Captain, both residing on the Property of the Henry Nourse Gold Mining Com-
pany, Limited, near Johannesburg, in the South African Republic, do hereby
declare the nature of this invention to be as follows:-
This invention has reference to the guide-blocks of stamp-mills employed for
the reduction of ores.
Hitherto these guide-blocks have most usually been constructed of wood and in
halves, each half being formed with a number of semicircular grooves or recesses
corresponding to the number of stamps so that when bolted together they form
holes or passages through the block through which the stamp stems work.
Our invention is designed to obviate the disadvantages experienced with this
and other forms of guide-blocks, or to effect a very material reduction in the
friction created between the surfaces in contact due in a large measure to the
canting or tilting of the stamp stem in the block as the stamp is being raised
by the cam, and to reduce the wear and tear of the several parts, and also to
effect a saving in the power required to drive the stamps.
It consists essentially in forming that portion of the guide-block through which
the stamp stems work with grooves or races on the inside in which a number of
balls are inserted in such a way as to project into the passages or openings in the
block to bear against the stem and traverse the races as the stem works up and
down therein.
In carrying out our invention we prefer to constuct the guide-block to receive
These bushes are cast or
and to provide it with bushes for each stamp stem.
otherwise conveniently constructed preferably in four parts or sections, being
formed with lugs or projections through which they may be bolted or otherwise
firmly secured together. Each of the four sections of the bush is formed with a pre-
In this race a suitable
ferably vertical groove or race opening into the interior.
number of halls are so placed as to project somewhat into the interior of the bush or
beyond the inner surface thereof, being held in position therein by means of a
separate grooved piece fitted to each section of the bush from the outside.
If preferred the races may be of spiral formation to correspond with the rotary
movement imparted to the stamp stem by the cam.
Dated this 26th day of September 1898.
FELL & JAMES,
Agents for the Applicants.

page_text: Improvements in the Guide-blocks of Stamp-mills.
We, RICHARD SHEPHERD, Millwright, and REGINALD GRYLLS THOMAS, Mining
Captain, both residing on the Property of the Henry Nourse Gold Mining Com-
pany, Limited, near Johannesburg, in the South African Republic, do hereby
declare the nature of this invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
-
This invention has reference to the guide-blocks' of stamp-mills employed for
the milling or reduction of ores.
Hitherto these guide-blocks have most usually been constructed of wood and
in halves, each half of the block being formed with a number of semicircular
grooves or recesses corresponding to the number of stamps so that when bolted
together they form holes or passages through the block in which the stamp stenis
work.
Our invention is designed to obviate the disadvantages experienced with this
and other forms of guide-blocks, or to effect a very material reduction in. the
friction created between the surfaces of the steam and guide-block in contact due
in some measure to the canting or tilting of the stamp stem in the block as the
stamp is being raised by the cam, and to reduce the wear and tear of the several
parts, and also to effect a saving in the power required to drive the stamps.
It consists essentially in forming that portion of the guide-block in or through
which the stamp stems work with grooves or races on the inside in which a
number of balls are inserted in such a way as to project into the passages or
openings in the block to bear against the stem and traverse the races as the stem
works up and down therein.
The invention will be more particularly described by aid of the accompanying
drawing, in which,
Fig. 1 is a sectional elevation, and
Fig. 2, a sectional plan.
The guide blocks are constructed to receive and are provided with detachable
parts or bushes for each stamp stem, one of which is illustrated in the drawing.
Two guide blocks, as usual, will preferably be employed suitably arranged and
secured to the frame work of the mill.
. The bushes, which are preferably made of metal; are cast or otherwise con-
veniently constructed by preference in four internal
sections a a¹ a² a³, so shaped that when assembled they form a longitudinal circular
or central parts or
hole or opening A slightly exceeding the diameter of the stamp stem B.
The parts or sections a a¹ a² a³ are each formed with a preferably vertical groove
or race opening into the interior in which a suitable number of friction balls C
are placed. The grooves b are so formed that the balls C project somewhat into
the interior of the bush or beyond the inner surface of the opening: A (as seen
in Fig. 2) so as to engage the stem B and to prevent it coming in contact with
the walls of the several sections as it works.up and down therein. At the bottom
of the grooves or races b a toe-piece or approximately semi-spherical headed
stud c is fitted.
The parts or sections a a² are attached to the parts or sections a¹a³ by two or
more projections e e¹ formed thereon at either side which engage or enter corre-
spondingly shaped recesses formed in the parts a¹³ on the inside.
At the outside of each of the parts aa¹ a² a³ a separate piece ddd³ ³ is fitted
grooved on the inside to complete the formation of the races b for the friction
balls C, and for maintaining the same in position to engage the stem. A

page_text: The several parts of the bush are firmly secured together by means of bolts
passed through the bolt holes f f f f³ formed through lugs provided on the parts
at either extremity. ggl are the lugs formed at either end on the parts a¹a³;
hh the lugs formed on the outside pieces dd, and jj the corresponding lugs or
projections formed on the outside pieces d¹³ at each end.
If preferred the races may be of spiral formation to correspond with the rotary
movement imparted to the stamp stem by the cam.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. A guide block for stamp mills having that portion in or through which the
stamp stem works provided with a number of friction balls so arranged as to
project into the opening to engage or bear against the stamp stem as it works up
and down therein, substantially as described.
2. In a guide block for stamp mills, a bush or detachable piece adapted to be
fitted thereto, constructed in sections, the sections being provided with grooves or
races for a number of friction balls opening into the interior of the bush to
engage the stem, and with separate pieces fitted to the several sections and grooved
on the inside to complete the formation of the races for the friction balls sub-
stantially as described and shewn.
3. A bush for the guide blocks of stamp mills constructed and arranged sub-
stantially as and for the purposes herein before described and shewn in the accoin-
panying drawings.
1000

page_text: a