IMPROVEMENTS IN THE MANUFACTURE OF STAMP HEADS AND BEDS EMPLOYED IN CRUSHING ORES AND OTHER MINERAL SUBSTANCES
Year: 1862

page_text: LETTERS PATENT to William Daniel Allen, of Laithfield House, Norfolk
Road, Sheffield, for the Invention of "IMPROVEMENTS IN THE MANUFACTURE
OF STAMP HEADS AND BEDS EMPLOYED IN CRUSHING ORES AND OTHER MINERAL
SUBSTANCES."
Sealed the 24th June 1862, and dated the 13th February 1862.
PROVISIONAL SPECIFICATION left by the said William Daniel Allen
at the Office of the Commissioners of Patents, with his Petition, on the
13th February 1862.
I, WILLIAM DANIEL ALLEN, of Laithfield House, Norfolk Road, Sheffield,
do hereby declare the nature of the Invention for "IMPROVEMENTS IN THE
MANUFACTURE OF STAMP HEADS AND BEDS EMPLOYED IN CRUSHING ORES AND OTHER
MINERAL SUBSTANCES," to be as follows:-
My Invention consists in the manufacture of stamp leads and beds by
founding or casting them in molten steel, and I prefer to employ iron
moulds for this purpose so formed as to impart the necessary shape and
dimensions to the cast articles, due allowance being made for the shrinking
of the metal in the said moulds. Or in lieu of casting the said articles of
the exact size required, I sometimes make them a little larger in order that
their exterior surfaces may be improved, and the metal of which they are
5 formed rendered more dense by a small amount of hammering, which will:
at the same time give them the required dimensions. The upper end of

page_text: the stamp head may be so shaped in the mould as to suit the mode of fixing
required, but when they are to be formed with a long slender shank I make
this part of hammered mild steel, or of wrought or malleable iron, the shank
piece being of such length as will admit of some 5 or 6 inches of it being.
immersed in fluid steel at the time of founding; I prefer to heat to a full
red that part of the shank which enters the fluid metal, and to make it of.
a dovetailed or such other form as will prevent it from being withdrawn from
the stamp head when in use, the shank may be made to occupy its proper
position in the mould by attaching it to a moveable guide pieco fitted to
the mould so that it may be quickly inserted in the fluid metal after it has
been run into the mould, or the shank may be first put into position, and
the molten steel be poured in, and allowed to rise up and surround
the heated portion of the shank; a "stopper," may, if necessary, be then put
down upon the upper surface of the fluid steel, or the shank piece may be
made to project from the under side of a "mould stopper" and thus determine
both its position in the mould and the depth .to which the heated end of
the shank is immersed in the fluid metal. The moveable beds on which
the ores or other mineral substances are to be crushed may be made by
founding or casting them in molten steel either of the exact size required
or of a size a little in excess of such dimensions, and be then reduced by a
small amount of hammering in order to perfect their exterior surface and
render the metal more dense if cast with a head of metal; it may be removed
by a saw or other cutter while hot or planed off when cold for the purposes
of this Invention. I prefer to employ a hard or highly carbonized steel.
obtained direct from pig iron by the Bessemer process, and of a quality which
will make sound castings.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Daniel Allen in the Great Seal Patent Office
on the 12th August 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,. WILLIAM:
DANIEL ALLEN, of Laithfield House, Norfolk Road, Sheffield, send greeting..
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters.
Patent, bearing date the Thirteenth day of February, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-fifth year of Her.
reign, did, for Herself, Her heirs and successors, give and grant. unto me, the 3
said William Daniel Allen, Her special licence that I, the said William

page_text: Daniel Allen, my executors, administrators, and assigns, or such others
as I, the said William Daniel Allen, 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 King-
dom of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN THE MANUFACTURE OF STAMP HEADS AND BEDS
EMPLOYED IN CRUSHING ORES AND OTHER MINERAL SUBSTANCES," upon the condition
(amongst others) that I, the said William Daniel Allen, 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 Daniel Allen, do hereby
declare the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
My Invention consists in the manufacture of stamp heads and beds by
founding or casting them in molten steel, which for this purpose I prefer to
use in a hard or highly carbonized state, or to add to the molten steel as much
cast or pig iron as will give the degree of hardness required. In carrying
into practical operation my said Invention, I prefer to employ iron moulds so
formed as to impart the necessary shape and dimensions to the cast stamp
head, due allowance being made for the shrinking of the metal; or in lieu of
casting them of the exact size required, I sometimes make them a little larger,
in order that their exterior surface may be improved, and the metal of which
they are formed rendered more dense by a small amount of hammering, which
at the same time gives them the required dimensions; the hammering of the
said stamp heads or beds I prefer to effect while they are still in a heated
state from the casting operation, but in order that their temperature through-
aut should be rendered as equal as possible, I find it advisable to put them
in a suitable heating furnace for a short time before hammering, and reheat
their exterior surface, which mostly becomes too much lowered in temperature
by the absorption of heat by the iron moulds in which they have been cast.
The upper end of the stamp head may be so shaped in the mould as to
suit the mode of fixing required, but when they are to be formed with the
long slender shank in common use, I make this part of hammered mild steel,

page_text: or of wrought malleable iron, the shank piece being of such length as will
admit of some five or six inches of it being immersed in the fluid steel at the
time of founding. I prefer to heat to a fair red that part of the shank which
enters the fluid metal, and to make it of a dovetailed or such other form as
will prevent it from being withdrawn from the stamp head when in use, and
it may be further secured by boring a hole through the upper part of the stamp
head, the hole passing also through the shank, into which a cross pin may
be tightly driven. In inserting the shank piece into the fluid steel, it may be
made to occupy its proper position by attaching it to a moveable guide fitted
to the mould, so that it may be quickly inserted into the fluid metal after the
same has been run into the mould, or the shank may be first put into position,
and the molten steel be poured in and allowed to rise up and surround tho
heated portion of the shank. A "stopper" may, if necessary, be then put
down upon the upper surface of the fluid steel, or the shank piece may be.
made to project from the under side of a mould "stopper," and thus determine
both its position in the mould and the depth to which the heated end of the
shank is immersed in the fluid metal. The moveable beds on which the ores
or other mineral substances are to be crushed may be made by founding
them in molten steel of a highly carbonized quality as herein-before described,
the said beds being cast either of the exact size required or of a size a little in
excess of such dimensions, and to be then reduced by a small amount of
hammering, in order to perfect their exterior surface, and render the metal
more dense, as in the making of the stamp heads herein-before described. If
cast with a head of metal, it may be removed by a saw or other cutter while
hot, or planed off when cold. For the purposes of this Invention I prefer to
employ steel obtained direct from pig iron by the "Bessemer process," and of
a quality that will make sound castings.
In witness whereof, I, the said William Daniel Allen, have hereunto'
set my hand and seal, this Second day of August, in the year of our
Lord One thousand eight hundred and sixty-two.
WILLIAM DANIEL ALLEN. (L.S.)