IMPROVEMENTS IN MACHINERY OR APPARATUS FOR STAMPING, CRUSHING, OR PULVERIZING ORES AND OTHER HARD SUBSTANCES
Year: 1871

page_text: LETTERS PATENT to William Tregay, of Pedn-an-drea, Redruth, in
the County of Cornwall, Mining Engineer, for the Invention of
"IMPROVEMENTS IN MACHINERY OR APPARATUS FOR STAMPING, CRUSHING, OR
PULVERIZING ORES AND OTHER HARD SUBSTANCES."
Sealed the 29th September 1871, and dated the 5th April 1871.
PROVISIONAL SPECIFICATION left by the said William Tregay at the
Office of the Commissioners of Patents, with his Petition, on the
5th April 1871.
I, WILLIAM TREGAY, of Pedn-an-drea, Redruth, in the County of
Cornwall, Mining Engineer, do hereby declare the nature of the said.
Invention for "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR STAMPING,
. CRUSHING, OR PULVERIZING ORES AND OTHER HARD SUBSTANCES," to be as
follows:-
My Invention relates to the construction and arrangement of the
"cover"
or coffer in which stones, ores, and other hard or brittle.
substances are stamped, crushed, or pulverized, by which peculiar.

page_text: construction or arrangement of my Invention the discharge of the
pulverized substance is facilitated and the effective power of the
machinery consequently improved.
46
"
My said Invention consists of an arrangement by which the grate way
or discharge way through which the pulverized substance is discharged,
can be extended around both the compass or sides and angles of the
aforesaid coffer, by which means tho whole, or as much of the compass
or sides and angles of the coffer as may be desired can be used as
grate way
or discharge way, instead of much of this space being
blocked up by the framework as heretofore. For this purpose I employ a
"foot piece" so constructed as to support the framework of the "coffer"
without closing in upon the angles or sides thereof at the part where
the "grate way" or discharge way is situated, but with its stanchions
standing off at a suitable distanco therefrom, to admit of a continuation
of such opening for "grate way" or discharge way as may be requisite
for the free discharge of the pulverized substances. To the stanchions of
this "foot piece" are bolted the posts or standards of the stamps, which
posts are connected at the upper part by girders serving to carry the
guides of the stamps as usual. The coffer I prefer to make oblong, but
it may be made of other form when desirable, my Invention being such
an arrangement of the coffer as will enable the discharge way to be
extended around the coffer by setting back the stanchions of the foot
piece as described.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Tregay in the Great Seal Patent Office.2
on the 5th October 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
TREGAY, of Pedn-an-drea, Redruth, in the County of Cornwall, Mining
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 3
Letters Patent, bearing date the Fifth day of April, in the year of our
Lord One thousand eight hundred and seventy-one, in the thirty-fourth
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said William Tregay, Her special licence
that I, the said William Tregay, my executors, administrators, and 3

page_text: assigns, or such others as I, the said William Tregay, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time, and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
3 vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for “IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR STAMPING, CRUSHING, OR PULVERIZING ORES AND.
OTHER HARD SUBSTANCES," upon the condition (amongst others) that I, the
said William Tregay, my executors or administrators, by an instrument
in writing under my, or 'their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Tregay, do hereby declare
the nature of my said Invention, and in what manner the samo is to be
performed, to be particularly described and ascertained in and by the
following statement, reference being had to the Sheet of Drawings here--
unto annexed, and to the letters and figures marked thereon (that is
to say):-
">
My Invention relates to the construction and arrangement of the
" cover
or coffer in which the stones, ores, and other hard or brittlo
substances are stamped, crushed, or pulverized, by which peculiar
construction or arrangement of my Invention the discharge of the pul-
verized substance is facilitated, and the effective power of the machinery
consequently improved.
My said Invention consists of an arrangement by which the grate way
or discharge way through which the pulverized substance is discharged
can be extended around the compass or sides and angles of the aforesaid
O coffer, by which means the whole, or as much of the compass or sides
and angles of the coffer as may be desired, can be used as "grate way”
or discharge way, instead of much of this space being blocked up by the
framework as heretofore. For this purpose I employ a "foot piece" so
constructed as to support the framework of the coffer without closing
5 in upon the angles or sides thereof at the part where the "grate way
or discharge way is situated, but with its stanchions standing off at a
suitable distance- therefrom to admit of a continuation of such opening
"

page_text: for grate way or discharge way as may bo requisite for the freo dis-
charge of the pulverized substances. To the stanchions of this "foot
piece" are bolted the posts or standards of the stamps, which posts aro
connected at the upper part by girders serving to carry the guides of
the stamps as usual. The coffer I prefer to make oblong, but it may E
be made of other form when desirable, my Invention being such an
arrangement of the coffer as will enable the discharge way to be extended
around the coffer by setting back the stanchions of the foot piece as
described
Figure 1 is a front elevation of the "coffer" of a stamping mill
constructed according to my Invention; Figure 2 is a longitudinal
section of same taken on line 1-1, Figure 3, which is likewise a section
of the coffer taken. horizontally through the grato way on the line 2—2,
Figure 2; Figuro 4 is an end elevation of the coffer; and Figure 5 is a 1
transverse section on line 3-3, Figure 1. Similar letters of reference
indicate the same parts in all the Figures.
I
A is the foot piece or frame of the coffer. This foot piece may be
constructed of cast iron or other metal, wrought iron or wood, but
preferably of cast iron, as shown in the Drawings. Each stanchion A is
cast with a flange at bottom, by which it is firmly bolted to the wooden
sleepers B. C is the coffer in which the stones, ores, or other hard or
brittle substances supplied thereto are stamped, crushed, or pulverized
by the stamps E. I generally construct the coffer of oblong form, as
shown, but it may be made round, square, or of other form, tho grate :
and its adjuncts being shaped to correspond. To the stanchions A aro
bolted the oak posts or standards D, which support the framework or
upper part of the apparatus. E are the stamps attached to lifters E¹
operated from a tappet shaft as usual, or in any other suitable manner;
F is an iron bottom or bed on which rest the substances to be broken.
The stanchions A have an opening G, a similar opening being provided
on either side of the coffer, which latter, according to my Invention, is
so constructed as to afford a clear grate way or discharge way on all or
as many of the sides of the coffer as may be desired, unobstructed by
the framework, as has been the case hitherto, thereby permitting a freer a
egress of the pulverized substances. The stanchions A. are formed with
angle pieces at the corners of the coffer, to which the boards forming

page_text: the front of the coffer are bolted. H is the "grate." It consists of a
perforated sheet of metal extending round the interior of the coffer on
every side where the grate way is situate. In the Drawings this sheet
of metal is shown on three sides of the coffer, the opening at which the
coffer is charged-being situated on the fourth side. The angles of the
stanchions A stand off from the angles of the grate, the entire surface
of which is therefore utilized, not being partially blocked up by the
framework of the coffer as hitherto. I is a metal lining or frame bolted
on the inside of the coffer around each opening G by bolts I' passing
through the stanchions A. The grate H is clamped firmly against this
lining I by a frame K placed within the opening or discharge way, and
having projecting lugs on the back by which the frame is pressed against
the grate, and secured by a cross bar K¹ passing through the staples L,
and pressed home by wedges M. N is a rim or packing of some yielding
substance, such as india-rubber or flannel, bound round a rim of iron
compressed between the frame I and the edge of the grate plate, for
which it serves as a caulking to prevent leakage around the grate.
L'are bolts to secure the staples L to the stanchions A. The said bolts
may also support one end I" of the end grate plates or linings I, and
for this purpose their inner ends are countersunk so as to be flush
with the inner surface of the plate I. N'are metal plates secured by
bolts N" with which the interior of the coffer is lined as usual; and O
is an iron shutter sliding in grooves in the framework of the coffer, and
serving to regulate the supply of the substance to be broken. It is
supported by the angle iron O' resting on the top of the "foot piece" A.
P, P, are wood blocks with which the back angles may be filled when
the grate is made to end there instead of being carried quite around
the coffer. This is sometimes done in order to open a broad aper-
ture R for charging at the level of the grate hole, which would otherwise
have to be done above the level of the grate way. In the latter case
the grate H would be carried round all four sides of the coffer clear
of the rear angles, as shown in Figure 3, in respect of the front angles,
the blocks P and portions I" of frames I being dispensed with. In this
case a clamping device would be applied to the rear opening to hold the
grate therein, the same as for the other openings. In the coffer shown
the material to be pulverized is fed in through the aperture R. from the
pass leading from the hopper containing the supply, the amount of
opening being regulated in the usual manner by the shutter O before
mentioned.

page_text: Having described the nature of my Invention, and the manner of
performing the same, I declare that what I claim as my Invention to
be protected by the herein-before in part recited Letters Patent is, con-
structing that part of the coffer at which the grate way or discharge way
is situated, and applying the grate. thereto so as to allow of the latter 5
being extended entirely across cach side of the coffer (or quite around
the whole or any part of its compass), unobstructed by the framework
at the angles, substantially as hercin-before described and illustrated in.
the Drawings annexed for the purpose specified.
In witness whereof, I, the said William Tregay, have hereunto set 1
my hand and seal, this Third day of October, in the year of our
Lord One thousand eight hundred and seventy-one.