IMPROVEMENTS IN APPARATUS USED IN PRODUCING MOULDS FOR CASTING
Year: 1860

page_text: LETTERS PATENT to Robert Jobson, of Dudley, in the County of
Worcester, and Robert James Ransome, of Ipswich, for the Inven-
tion of "IMPROVEMENTS IN APPARATUS USED IN PRODUCING MOULDS FOR
CASTING."
Sealed the 12th February 1861, and dated the 25th August 1860.
PROVISIONAL SPECIFICATION left by the said Robert Jobson and Robert
James Ransome at the Office of the Commissioners of Patents, with
their Petition, on the 25th August 1860.
We, ROBERT JOBSON, of Dudley, in the County of Worcester, and ROBERT
JAMES RANSONE, of Ipswich, do hereby declare the nature of the Inven-
tion for "IMPROVEMENTS IN APPARATUS USED IN PRODUCING MOULDS FOR CASTING,"
to be as follows:-
This Invention has for its object improvements in apparatus used in pro-
ducing moulds for casting. For these purposes in order to produce moulds for
casting cog or toothed wheels or other articles we employ (as has been prac-
tised heretofore) a plate having a passage through it exactly fitting the pattern;
and in producing a mould, sand is rammed around the pattern, which at that

page_text: time is caused to project up above the surface of the plate, and the pattern is
subsequently withdrawn through the hole or passage. In many cases the
producing plates, such as above described, in the ordinary manner is costly.
Now, according to this Invention, the opening in the plate is formed somewhat
larger than is required for the passage of the pattern, and without reference to
the peculiar contour thereof, and afterwards when the pattern is in its place
fusible metal or other material is poured or filled into the space between the
pattern and the plate; provision is made for holding or retaining the introduced
metal or material securely within the opening through the plate. .
By these means the openings through a bed plate or surface on which a
mould is to be made and the pattern withdrawn through such plates or
surfaces, will be made more correctly and at the same time more readily and
cheaply than heretofore.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said 'Robert Jobson and Robert James Ransome in the Great
Seal Patent Office on the 23rd February 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME,, we, ROBERT
JOBSON, of Dudley, in the County of Worcester, and ROBERT JAMES RANSOME,
of Ipswich, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of August, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-fourth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
Robert Jobson and Robert James Ransome, Her special licence that we, the
said Robert Jobson and Robert James Ransome, our executors, adminis-
trators, and assigns, or such others as we, the said Robert Jobson and Robert
James Ransome, our 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
APPARATUS. USED IN PRODUCING MOULDS FOR CASTING," upon the condition (amongst
others) that we, the said Robert Jobson and Robert James Ransome, our
executors or administrators, by an instrument in writing under our or their

page_text: hands and seals, or under the hand and seal of one of us or them, 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 imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Robert Jobson, on behalf of myself and
the said Robert James Ransome, 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:-
:
pro-
This Invention has for its object improvements in apparatus used in
ducing moulds for casting. For these purposes, in order to produce moulds
for casting cog or toothed wheels or other articles, we employ (as has been
practised heretofore) a plate having a passage through it exactly fitting the
pattern; and in producing a mould sand is rammed around the pattern, which
at that time is caused to project up above the surface of the plate, and. the
pattern is subsequently withdrawn through. the hole or passage. In many
cases the producing plates, such as. above described, in the ordinary manner is
costly. Now, according to this Invention, the opening in the plate. is formed
somewhat larger than is required for the passage of the pattern and without
reference to the peculiar contour 'thereof, and afterwards when the pattern is
in its place, a fusible metal or other material is poured or filled into the space
between the pattern and the plate. Provision is made for holding or retaining
the introduced metal or material securely within the opening through the
plate.
By these means the openings through a bed plate or surface on which a
mould is to be made, and the pattern withdrawn through such plates or
surfaces, will be made more correctly, and at the same time more readily and
cheaply than heretofore.
Having thus stated the nature of our Invention, we will proceed more fully
to describe the manner of performing the same.
DESCRIPTION OF THE DRAWING...
. Figure 1 represents in plan a portion of the surface of a bed plate or table
suitable for having moulds formed thereon, when that system of making
moulds is resorted to which consists in withdrawing the pattern from the mould
through a bed plate or, table. Heretofore when employing such system. of
making moulds, it has been usual to make the openings or passages throught

page_text: the bed plates or tables accurately to correspond with the pattern, by cutting
or forming such passages or openings through the materials of which the bed.
plates or tables are formed, which is often very expensive; now, according to
the present Invention, the openings or passages through the plates or tables
on which moulds are, as above stated, made of larger dimensions than the
patterns, and the requisite accuracy for fitting the patterns is obtained by
running in metal or other suitable material, and thus filling up the spaces
between the patterns and the openings in the tables or bed plates, provision
being made for holding the parts or fillings thus cast or introduced, in order
for the time that such filling parts may form parts of the bed plates or tables
on which the moulds are made, and through which the patterns are drawn
when the moulds have been made. The Drawing shows, as an example; the
pattern to be a cog wheel.
a, a, is part of a plate or table suitable for having a mould made thereon,
and which in the Drawing is colored blue; b, b; is part of the pattern which is
colored brown; and c, c, is the filling of metal. or other suitable material,
colored yellow, between the table or plate and the pattern; and in order to
hold the filling c; c, securely to the table or plate a, a, it is preferred to form
the table with a groove, as is shown in section at Figure 2. It is also preferred
to employ a readily fusible metal, and to run the same in at the openings d, d,
which are so formed as to hold the ring of filling thus produced from turning
round within the opening or passage through the table or plate when the form
of such opening or passage is circular, as is the case in the example shown in
the Drawing, but other modes of holding the filling metal or material may be
resorted to, and in place of making the filling c, c, in one piece it may be
formed or cast in sections. In cases where the pattern is of a ring shape or
open in the centre or other part, the table or bed plate may be made with a
part of its surface suitable for entering into the interior of the pattern, as has
heretofore been practised, but such parts need not be made so accurately as to
fit the interior of the pattern, but on the contrary, the space or spaces between
such inner parts of the bed or plate and the interior of the pattern may be
similarly filled to what has been above described with metal or other suitable
material, so as to admit of the pattern being drawn through the table or plate,
leaving the central or interior part of the table, as well as the parts exterior of
the pattern, properly held and supported. Or, where the interior open portions
of the patterns are small, they may be wholly formed by running in fluid
metal or other material, so as to form such part of the bed plate or table in a
manner suitable for the pattern to be drawn through it. In which cases

page_text: suitable supports are to be provided for supporting and upholding such parts
of the table or plate, as has heretofore been the case when separate parts of
the table or plate have been used. Various materials and metals may be used
for filling the spaces between the tables or bed plates and the patterns used
therewith, but we prefer to employ an alloy of metal consisting of 8 parts of
tin, 4 parts of lead, and 1 part of bismuth.
In witness whereof, I, the said Robert Jobson, have hereunto set my
hand and seal, this Fifteenth day of February, in the year of our Lord
One thousand eight hundred and sixty-one.
ROB. JOBSON. (L.S.)