IMPROVEMENTS IN MANUFACTURING MOULDS FOR CASTING METAL
Year: 1852

page_text: LETTERS PATENT to John Jobson, of Litchurch, in the County
of Derby, Ironfounder, for the Invention of "IMPROVEMENTS IN
MANUFACTURING MOULDS FOR CASTING METAL."
Sealed the 26th February 1853, and dated the 2nd October 1852.
PROVISIONAL SPECIFICATION left by the said John Jobson at the
Office of the Commissioners of Patents, with his Petition, on the
2nd October 1852.
I, JOHN JOBSON, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN MANUFACTURING MOULDS FOR CASTING METAL" to
be as follows:-
I prepare a pattern of the article to be cast, which pattern I make,
by preference, of iron or other metal. Thus, if it be required to pre-
pare moulds for the casting of a plate of the annexed sectional form,
and the surface A, is required to be well executed, as in
stove plates and similar castings, I prepare an iron pattern of the same,
and I make two moulds from the same of plaster of Paris or other
suitable material, which will present the annexed forms.

page_text: I then attach some pins UT
pattern, and I replace it in the mould 1, thus
make another mould of plaster or cement upon it.
mould the pattern remains attached to it thus
and I
On removing this
I then
take another cast in plaster or cement from the mould No. 2, which is
of the annexed form No. 4,
I then destroy the
moulds 1, and 2, and I employ the casts or moulds 3, and 4, to make
sand moulds for casting the required article. Thus the sand mould 5,
is produced from No. 3, by placing a frame or box
upon it and ramming sand into it, and the sand mould 6,
is produced from No. 4. These two moulds, when united, form the
complete mould
for receiving the melted iron or
other metal. Suitable passages for the entrance of the metal are
formed at the same time or afterwards. The frames or boxes are pro-
vided with pins and holes; which fit corresponding holes and pins in
the casts or moulds 3, and 4, or in boxes surrounding them. The
casts 3, and 4, may be made of Roman cement, Keene's patent
cement, concrete, or other suitable composition. The surface should be
of a hard and smooth substance, but the mass of the block may con-
sist of fragments of brick, or wood, or rubbish, bound together by any
suitable cement. The two parts of the sand mould are thus made
separately and then put together, in lieu of being made one upon the
other with the pattern between them, and then separated to enable the
pattern to be removed. A cement cast may be taken from the mould
No. 1, and used for preparing the sand mould No. 5, but I prefer to
proceed as above described, as the sand mould for the front of the cast-
ing is moulded upon the smooth iron pattern, and thus produces a
better casting.
This method of moulding requires less skill on the part of the work-
man than the ordinary method.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Jobson, in the Great Seal Patent Office,
on the 30th March 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
JOHN JOBSON, of Litchurch, in the County of Derby, Ironfounder,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of October, in the year of
our Lord One thousand eight hundred and fifty-two, in the sixteenth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said John Jobson, Her special licence that I, the
said John Jobson, my executors, administrators, and assigns, or such
others as I, the said John Jobson, 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 MANUFACTURING
MOULDS FOR CASTING METAL," upon the condition (amongst others) that
I, the said John Jobson, by an instrument in writing under my hand
and seal, 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 John Jobson, 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 thereof, reference being had to the accompany-
ing drawing, and the figures and letters marked thereon, that is
to say:
I prepare a pattern of the article to be cast, which pattern I make,
by preference, of iron or other metal. Thus, if it be required to
prepare moulds for the casting of a plate of the sectional form shewn

page_text: in Figure 1, and the surface A, is required to be well executed, as in
stove plates and similar castings, I prepare an iron pattern of the same,
and I make two moulds from the same of plaster of Paris or other
suitable material, which will present the forms shewn in Figures 2,
and 3. I then attach some pins or hooks to the hollow side or back of
the pattern, and I replace it in the mould Figure 2, as shewn in
Figure 4, and I make another mould of Roman cement upon it. On
removing this mould the pattern remains attached to it, as shewn in
Figure 5. I then take another cast in Roman cement from the mould
Figure 3, which is of the form shown in Figure 6. I then destroy the
moulds Figures 2, and 3, and I employ the casts or moulds Figures 5,
and 6, as ramming blocks for making sand moulds for casting the
required article. Thus the sand mould Figure 7, is produced from
Figure 5, by placing a frame or box upon it and ramming sand into it,
and the sand mould Figure 8, is produced in a similar manner from
Figure 6. These two moulds, when united, form the complete mould,
as shewn in Figure 9, for receiving the melted iron or other metal.
Suitable passages for the entrance of the metal are formed at the same
time or afterwards. The frames or boxes are provided with pins and
holes, which fit corresponding holes and pins in the casts or moulds
Figures 5 and 6, or in boxes surrounding them. I prefer to make the
casts Figures 5 and 6, of Roman cement, but they may be made of
Keene's patent cement, or of plaster of Paris, or other suitable compo-
sition which is capable of being applied in a fluid or semi-fluid state and
of afterwards becoming solid. The surface should be of a hard and
smooth substance, but the mass of the block may consist of concrete,
or of fragments of brick,, or wood, or rubbish, bound together by any
suitable cement. The two parts of the sand mould are thus made
separately, and then put together, in lieu of being made one upon the
other with the pattern between them, and then separated, to enable
the pattern to be removed, as in the ordinary manner of casting.
A cement cast may be taken from the mould Figure 2, and used for
preparing the sand mould Figure 7, but I prefer to proceed as above
described, as the sand mould for the front of the casting is moulded
upon the smooth iron pattern, and thus produces a better casting.

page_text: The process above described may be modified in the following
I prepare, as before, an iron pattern Figure 1, which I
imbed in sand or other suitable material, as shewn in Figure 10, in
which P, is the pattern, S, is the sand, and B, is the box.
I then place upon it a box or frame, into which I run Roman cement
or other suitable composition, which produces the mould or ramming
block Figure 11.
I then remove the sand from the hox B, Figure 10, and I place it
upon Figure 11, after removing the pattern P, from off the face of the
cement C, of Figure 11.
I then take another cast in cement or other suitable material, which
is shewn in Figure 12.
I then separate them, and replace the pattern P, on the cement block
C, as shewn in Figure 11, or Figure 13. I have then the blocks
shewn in Figures 12, and 13, and which I employ to make sand moulds
for casting the required article; thus the sand mould Figure 7, is pro-
duced from Figure 13, by placing a frame or box upon it and ramming
sand into the box, and the sand mould Figure 8, is produced from
Figure 12, in a similar manner. These two moulds, when united,
form the complete mould Figure 9.
Having thus described the nature of my Invention, and in what
manner the same is to be performed, I wish it to be understood that
what I claim is the mode or modes herein-before described of manu-
facturing moulds for casting metals by means of ramming blocks, made
in manner herein-before described.
In witness whereof, I, the said John Jobson, have hereunto set
my hand and seal, this Twenty-sixth day of March, in the
year of our Lord One thousand eight hundred and fifty-three.
Witness, WM WHISTON, Solicitor, Derby.
JOHN JOBSON. (L.S.)