IMPROVEMENTS IN THE MANUFACTURE OF MOULDS FOR CASTING, AND IN MACHINERY OF APPARATUS TO BE EMPLOYED IN THE BAID. MANUFACTURE
Year: 1869

page_text: PROVISIONAL SPECIFICATION left by John Roberts and Samuel
Roberts at the Office of the Commissioners of Patents, with their
Petition, on the 25th January 1869.
We, JOHN ROBERTS and SAMUEL ROBERTS, both of West Bromwich, in
the County of Stafford, Iron Founders, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN THE MANUFACTURE OF MOULDS FOR
CASTING, AND IN MACHINERY OF APPARATUS TO BE EMPLOYED IN THE BAID.
MANUFACTURE," to be as follows:-
In the ordinary method of manufacturing moulds for casting, a half-
mould is first formed upon the pattern or model, and the said half
mould is then inverted and a second half mould formed upon the pattern
or model contained in the first half mould; the second half mould is
lifted from the pattern and the pattern is removed from the first half
mould, and the two half moulds thus made are fitted together. In this
method of making moulds the pattern requires to be loosened by blows
or pressure before it can be removed from the mould, and the figure
of the mould is thereby injured.
We will describe our improvements in the manufacture of moulds
for casting in conjunction with the machinery or apparatus we employ,

page_text: and we will describe the said machinery or apparatus as constructed for
making moulds for casting iron pipes, such as gas or water pipes. The
pattern pipe is supported horizontally and accurately fits in an opening
in a moulding bed or plate at such a height that exactly one half of the
pipe stands above the upper surface of the said moulding bed or plate.
Upon this half pattern a half mould is made by ramming sand in a
mould box in the usual way. As soon as the half mould is made the
pattern is removed therefrom by depressing the said pattern through the
opening in the moulding bed or plate below the surface of the said bed
or plate, when the half mould formed may be removed from the moulding
bed or plate. The pattern is again raised to its original position in the
moulding plate and another half mould is made upon it, from which
the pattern is removed by depressing it below the moulding plate, as
before described. In this way any number of half moulds may be made,
the figure of which is much more perfect than that of half moulds made
in the ordinary manner. The said half moulds are also made more
expeditiously than by the ordinary manner.
The raising and lowering of the pattern model in the moulding bed
or plate is effected in the following manner :- Underneath the said
moulding bed or plate and parallel thereto is a shaft or axis running
the whole length of the opening in the moulding bed or plate. This
shaft carries cams or eccentrics, on which the pattern rests, and by
giving a motion of partial rotation to the said shaft the motion of the
cams on which the pattern rests raises or lowers the pattern to the
required extent. We do not, however, limit ourselves to this method
of raising and lowering the pattern in the moulding bed or plate.
Our Invention is particularly applicable to the making of moulds for
pipes, columns, and other articles having a figure more or less resembling
that of a cylinder, but may also be employed for making moulds for
casting other articles.