Year: 1898

page_text: A
Date of Application, 8th Jan., 1898
L
7th Nov 1000 Accepted 23rd Den
1808
A communication from the Firm of S. OPPENHEIM AND COMPANY, of. Hainholz,
Kingdom of Prussia.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:
This invention relates to an improved manufacture of cores, for use in iron and
metal foundries for producing hollow spaces in castings. It is very important
that these cores should be strong and firm and this is obtained by making the core
as hereinafter described.
This
According to this invention the principal material used in making the core con-
sists of a granular or granulated material, such as sand, flint and the like.
material is mixed with any suitable sacchariferous or saccharine substance, prefer-
ably with a cheap product such as is obtained in, or forms a waste-product in, the
manufacture of sugar, such as syrup or molasses, or the like. The mixed com-
pound, consisting of the granular material and the sacchariferous medium, are
stamped pressed or shaped into the form of cores and dried, say, in a drying stove,
until the mass has hardened.
Dated this 04h love of Tonu 1908
BOULT & WADE,
Agents for the Applicant.
A communication from the Firm of S. OPPENHEIM AND COMPANY, of Hainholz,
in the Kingdom of Prussia.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, Holborn Circus, in the County
of Middlesex, Chartered Patent Agent, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:—
This invention relates to improvements in the manufacture of cores for use in
iron- and metal-casting, and has for its object the construction of a core which
is firmer and stronger than cores as hitherto made, and is also very easily removed
after the casting operation has taken place.
In manufacturing cores according to this invention, a granular or granulated
D817

page_text: material, approximating as nearly as possible to pure silica is mixed with any suit-
able sacchariferous or saccharine substance, preferably with a cheap product such
as is obtained in, or forms a waste product in, the manufacture of sugar, such for
example as syrup, molasses or the like. The mixture is stamped, pressed or other-
wise shaped into the desired form of core and is then dried in a drying stove or
oven until the mass is hardened.
The drying is preferably performed at a temperature of 250° C. to 270° C. and
results in the decomposition and partial carbonisation of the sugar contained in the
medium with which the granular material is mixed. A considerable portion of the
gases resulting from the decomposition is expelled and the core after drying is
found to be well bound together and at the same time more porous than cores as
hitherto manufactured.
Owing to the fact above mentioned that a considerable quantity of gas is expelled
from the core during the drying process, less gas is given off by cores made accord-
ing to this invention during the process of casting, than by cores made by other
methods. Moreover the gas is generated much more slowly and its discharge is
facilitated by the extreme porosity of the new cores, and therefore the castings are
sound, clean and free from blow-holes. Time is consequently saved in the fettling
or dressing of the castings. A further advantage of such cores is that after the casting
is made the core is very friable and can therefore be removed much more quickly and
easily than is usually the case. Again. the new core does not shrink to any extent during
the drying operation and therefore the casting is true, and not distorted. Also,
owing to the firmness and cohesion of these cores, core irons" may often be
dispensed with, or may be made much lighter than those used with the old form
of cores.
We have found in practice that good results are obtained with a mixture having
the following approximate composition;-
Sand
Binding Material (molasses &c.)
"
-
100 parts.
4 parts.
The above proportions may, however, be varied, and cannot be strictly defined
owing to the fact that with a cheap material, such as molasses, the binding power
varies in different samples.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondents and in what manner the
same is to be performed, I declare that what I claim is:-
1. A core comprising a mixture of granular or granulated material and a
sacchariferous or saccharine substance which has been shaped and hardened by
drying approximately at the temperature specified.
2. A core made of a mixture of sand and molasses dried at a temperature
of 250° C. to 270° C. substantially as specified.
Dated this 7th day of November 1898.
BOULT & WADE,
Agents for the Applicant.