IMPROVEMENTS IN THE MODE OF MAKING THE JOINTS OF MOULDS FOR CASTING STEEL AND PROVISIONAL SPECIFICATIONTING AND OTHER METALS UNDER PRESSURE, AND FOR MATERIALS USED IN MAKING THE SAME
Year: 1881

page_text: LETTERS PATENT to Charles James Allport, of 11, Queen Victoria Street, in
the City of London, Mechanical Engineer, for an Invention of "IMPROVEMENTS
IN THE MODE OF MAKING THE JOINTS OF MOULDS FOR CASTING STEEL AND
PROVISIONAL SPECIFICATION left by the said Charles James Allport at the
Office of the Commissioners of Patents on the 4th February 1881.
CHARLES JAMES ALLPORT, of 11, Queen Victoria Street, in the City of London,
Mechanical Engineer. "IMPROVEMENTS IN THE MODE OF MAKING JOINTS OF
MOULDS FOR CASTING STEEL AND OTHER METALS UNDER PRESSURE, AND FOR
MATERIALS USED IN MAKING THE SAME."
The object of my Invention is to use asbestos for making the joints of moulds
for casting steel and other metals under pressure, and the mode in which it is
accomplished is to either use strips or rings of asbestos, millboard, or asbestos fibre
made into a gaskin between the bottom of the ingot mould and the bottom upon
which it stands, and the lid and top of the mould, and, if the mould is made into
more than one piece, between the joints of the different pieces.

page_text: SPECIFICATION. in pursuance of the conditions of the Letters Patent filed
by the said Charles James Allport in the Great Seal Patent Office on the
4th August 1881.
CHARLES JAMES ALLPORT, of 11, Queen Victoria Street, in the City of London,
Mechanical Engineer. "IMPROVEMENTS IN THE MODE OF MAKING THE JOINTS OF
MOULDS FOR CASTING STEEL AND OTHER METALS UNDER PRESSURE, AND FOR
MATERIAL USED IN MAKING THE SAME."
The object of my Invention is to make tight joints between the parts of moulds
used for casting steel and other metals under pressure. For this purpose I place
strips or rings of asbestos, millboard, or cloth, or asbestos fibre made into a gaskin,
or asbestos made up in other such like forms, between the bottom of the ingot
mould and the bottom upon which it stands, and between the lid and the top of
the mould, and also, if the mould is made into more than one piece, between the
joints of the different pieces.
Figure 1 shows a vertical section of one form of ingot mould with the joints at
top and bottom made tight with asbestos packing, as above described. A is the
mould; B, the bottom; C, the lid; D, D, are rings of the asbestos packing.
The mould is, as heretofore, formed with lugs projecting from it, by which it is
held down on to the bottom and other lugs, by the aid of which the lid can be
drawn down tightly on to the top of the mould after the mould has been filled.
I have not thought it necessary to show in the Drawing these lugs or the other
parts used for keying or connecting the parts of the mould together. The object
of forming a tight joint between the lid and mould is that the metal in the mould
may be put under pressure during the time it is setting by the admission of steam
or gas under high pressure into the interior of the mould so soon as the mould has
been closed. The steam or gas is admitted through a pipe connected to the lid.
This process of putting the metal under pressure is now well known, but great
difficulty has been experienced in practically carrying it out, owing to the difficulty
of obtaining tight joints between the parts of the mould. By my Invention this
difficulty is completely overcome.
Figure 2 shows a vertical section of a mould similar to that shown at Figure 1,
except that the lid and bottom are formed to fit within the ends of the mould
instead of fitting the exterior of the ends.
Figure 3 shows a vertical section of a similar mould, in which V grooves are
formed around and a gaskin of asbestos rope laid into these grooves; this way of
forming a tight joint may also be adopted when both the lid and bottom are formed
to fit within the ends of the mould, as in Figure 2.
Figures 4, 5, and 6 are horizontal sections showing various ways of applying the
asbestos packing to the vertical joints of ingot moulds. In Figure 4 the packing is
a strip of asbestos mill-board; in Figures 5 and 6 asbestos rope is used.
Having thus described the nature of my Invention and the manner of performing
the same I would have it understood that I claim, the employment of asbestos
mill-board or asbestos cloth or rope, or asbestos in other form, substantially in the
manner herein before described, for making tight joints between the parts of moulds
used for casting steel and other metals.
In witness whereof, I, the said Charles James Allport, have hereunto set my
hand and seal, this Fourth day of August, in the year of our Lord One
thousand eight hundred and eighty one.
CHARLES JAMES ALLPORT. (L.S.)