IMPROVEMENTS IN ORE STAMPING MACHINERY
Year: 1871

page_text: LETTERS PATENT to Albert James Atkey, of 33, Cornhill, in the
City of London, Engineer, for the Invention of "IMPROVEMENTS IN
ORE STAMPING MACHINERY."
Sealed the 19th May 1871, and dated the 31st January 1871.
PROVISIONAL SPECIFICATION left by the said Albert James Atkey
at the Office of the Commissioners of Patents, with his Petition,
on the 31st January 1871.
I, ALBERT JAMES ATKEY, of 33, Cornhill, in the City of London,
Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN ORE STAMPING MACHINERY," to be as follows:-
1
My improvements relate, in the first place, to the construction and
action of the coffers in which ore is placed to be crushed by stampers.
These coffers are usually made with upright sides with perforated grids
to allow the ejection of the crushed material mixed with water, but
owing to the limited area of grid the ejection of the material is retarded,
and when the ore is crushed dry the coffers after the crushing has been
performed have to be emptied by hand.

page_text: In order to facilitate the escape of the crushed material I make the
coffers with perforated sides lying obliquely, so that the upper part of
the coffer is considerably wider than the base. By this means I obtain
a larger area of perforated surface.
I also sometimes cause the stamping machinery to act by a rod and
crank or other convenient and known means, on the sloping sides of
the coffer so as to give them a vibratary or jigging motion, which
facilitates the escape of the crushed material, especially in the dry
state.
It is well known that stampers acting on the principle of the steam
hammer are used for crushing ore.
My improvements relate, secondly, to the construction and arrange-
ment of such stampers so as to render them portable and to provide
convenient space round the coffer for the removal of the ejected material.
For this purpose I mount the steam cylinder with its fittings on a framed
truck open for the passage of the stamper through it, and elevated on
its wheels or on temporary supports to a convenient height above the
ground. I place the anvil and coffer on a firm foundation, and bring
the portable stamper directly over it.
I also construct such steam stamping machines as follows:-I placé
the cylinder with its fittings on a framing which consists of vertical ribs
broad in one dimension and thin in the other, and I arrange these ribs
radiating round the coffer so that they present these thin edges to it,
and thus form little obstruction to the ejection of the crushed material
from it.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Albert James Atkey in the Great Seal Patent
Office on the 31st July 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALBERT
JAMES ATKEY, of 33, Cornhill, in the City of London, Engineer, send 3
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirty-first day of January, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty- ·

page_text: fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Albert James Atkey, Her special
licence that I, the said Albert James Atkey, my executors, adminis-
trators, and assigns, or such others as I, the said Albert James Atkey,
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
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
ORE STAMPING MACHINERY," upon the condition (amongst others) that I,
the said Albert James Atkey, 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 Albert James Atkey, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and by
the following statement :-
My improvements relate, in the first place, to the construction and
action of the coffers in which ore is placed to be crushed by stampers.
These coffers are usually made with upright sides with perforated grids
to allow the ejection of the crushed material mixed with water, but,
owing to the limited area of grid, the ejection of the material is retarded,
and when the ore is crushed dry, the coffers after the crushing has been
performed have to be emptied by hand.
In order to facilitate the escape of the crushed material I make the
coffers with perforated sides lying obliquely, so that the upper part of
the coffer is considerably wider than the base. By this means I obtain
a larger area of perforated surface.
I also sometimes cause the stamping machinery to act by a rod and
crank or other convenient and known means on the sloping sides of the
coffer so as to give them a vibratory or jigging motion, which facilitates
the escape of the crushed material, especially in the dry state.
It is well known that stampers acting on the principle of the steam
hammer are used for crushing ore.

page_text: My improvements relate, secondly, to the construction and arrange-
ment of such stampers so as to render them portable and to provide
convenient space round the coffer for the removal of the ejected material.
For this purpose I mount the steam cylinder with its fittings on a framed
truck open for the passage of the stamper through it, and elevated on its
wheels or on temporary supports to a convenient height above the
ground. I place the anvil and coffer on a firm foundation, and bring
the portable stamper directly over it.
I also construct such steam stamping machines as follows:-I place
the cylinder with its fittings on a framing which consists of vertical ribs
broad in one dimension and thin in the other, and I arrange these ribs
radiating round the coffer so that they present their thin edges to it,
and thus form little obstruction to the ejection of the crushed material
Surm it

page_text: ascends it acts on the rocking leverf, which by means of the cranked
lever e and the rope, cord, or chain d causes the coffer to turn partially
on its vertical axis. When the hammer descends so as to be clear of
the lever f the spring 9 pulls back the coffer. Thus at every stroke of
the hammer the coffer is caused to rotate partially to and fro with a
vibratory or jigging action. It is to be understood that the fixed cap of
the coffer has a circular recess in it to receive the upper lip of the coffer,
and that the anvil is of circular form within the base of the coffer so as
to form an axis for its rotation.
Fig. 4 represents an elevation of a portable steam stamping machine
in which the grid of the copper lies obliquely.
k is a strong framing mounted on wheels, and carrying the boiler and
steam stamping machine which is laid at an angle. 7 is the grid of the
coffer, which is in this case made a portion of a cylinder, as represented
in section in Fig. 5. Ore or other material fed by a hopper m is
stamped and crushed between the striker and the anvil, the pulverized
or comminuted products escaping through the perforations of the
grid l.
Having thus described my Invention, and in what manner it is to be
performed, I would have it understood that I do not limit myself to the
details or proportions represented in the Drawings as these may be varied
to suit particular cases without departing from the principles embodied
in my Invention.
In witness whereof, I, the said Albert James Atkey, have hereunto
got my hand and cool this 21st day of July AD 1871
Witness,
ALEXANDER P. WRIGHT,
55, Millbank Street,
Westminster,
London, S.W.
ALBERT JAMES ATKEY.
(L.S.)