IMPROVEMENTS IN CASTING CHILLED ROLLS
Year: 1873

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn
Fields, in the County of Middlesex, Gentleman, for the Invention
of 56
"IMPROVEMENTS IN CASTING CHILLED ROLLS."-A communication
from abroad by George Granville Lobdell, of Wilmington, New
Castle County, State of Delaware, United States of America.
Sealed the 25th July 1873, and dated the 10th June 1873.
COMPLETE SPECIFICATION filed by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition and
Declaration, on the 10th June 1873, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middle-
sex, Gentleman, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS IN
CASTING CHILLED ROLLS," and have petitioned Her Majesty to grant unto
me, my executors, administrators, and assigns, Her Royal Letters

page_text: Patent for the same, and have made solemn Declaration that the said
Invention is communicated to me from abroad by George Granville
Lobdell, of Wilmington, New Castle County, State of Delaware, United
States of America.
NOW KNOW YE, that I, the said John Henry Johnson, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention,
and in what manner the same is to be performed in and by the following
statement, reference being had to the accompanying Drawings, and to
the letters and figures marked thereon, that is to say :-
---
The object of this Invention is to prevent the breaking of the necks
of chilled rolls during the process of casting the same, and to readily
adjust the mould so as to cast rolls of different lengths; this object is
attained by a sleeve D lined with sand or loam 7, and adapted to the
interior of the chill A, substantially as shewn in the vertical section
Figure 1, so that it can be adjusted vertically in the chill and can yield
and accommodate itself to the shrinkage of the metal poured into the
mould; A is the upper portion of the chill in which the body of the
roll is cast, and on the top of this chill is placed a box B; D is a metal
sleeve or cylinder (shown detached in Figure 2), the upper portion of
which is contained in the box B, and the lower portion in the chill in
which it can slide freely, the inside of this sleeve being lined with sand or
its equivalent moulded the desired shape of the neck 6 of the roll. When
this sand lining has been properly dried it is placed with the sleeve D in
the chill in the position which the length of the roll to be cast requires,
the upper portion of the sleeve being contained within a body of sand
which has previously been prepared for its reception in the box B.
The sleeve may be temporarily supported by rods m, m, inserted
through. the box B and through the sand contained therein, the inner
end of the rod fitting into holes in the sleeve. The metal being a
poured through the usual runners into the lower end of the mould, rises
therein into the box B shortly after which the rods m, m, may be
withdrawn, and that part of the casting above the sleeve removed while
the metal is in a semi-fluid state.
The sleeve with its sand lining now supported by the metal in the a
mould, and being free to slide in the sand lining of the box can descend
with and accommodate itself to shrinkage of the roll, thereby preventing

page_text: the separation of the same at the neck which is liable to occur when the
upper neck adheres to a fixed portion of the mould.
It is preferred to perforate the sleeve and also the box B with small
holes, as shown, so as to permit the free escape of gases generated by
the molten metal, these vents insuring the soundness of the neck of
the roll.
One of the most important advantages of the Invention is the
facility which the sleeve affords for making rolls of different lengths, the
length of the roll being determined by the simple adjustment of the
sleeve in the chill.
Having now described and particularly ascertained the nature of the
said Invention and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what I consider to
be novel and original, and therefore claim as the Invention is,―
First. The sand lined sleeve D applied to the mould so as to be
movable and adjustable therein as set forth.
Second. The sand lined sleeve suspended in the chill by rods m, m, or
their equivalent as specified.
Third. The combination of the perforated sleeve D with the perforated
box B and its prepared lining.
In witness whereof, I, the said John Henry Johnson, have to this
my Complete Specification set my hand and scal, the Tenth
day of June One thousand eight hundred and seventy-three.
J. HENRY JOHNSON. (L.S.)