IMPROVEMENTS IN THE MANUFACTURE OF CAST METAL HOLLOW-WARE
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Oscar Banks at the Office of the
Commissioners of Patents on the 8th January 1880.
OSCAR BANKS, of Wednesbury, in the County of Stafford, Mechanical Engineer.
"IMPROVEMENTS IN THE MANUFACTURE OF CAST METAL HOLLOW-WARE."
This Invention relates to improvements in the method of moulding the above
hollow-ware on what is known as the "block-system" of moulding, and is applicable
also to other methods of moulding, and consists chiefly in substituting turned or
planed parts, forming male and female connections, in place of the ordinary pins
and holes used in placing the box parts for ramming up the mould and in putting
the box parts together for casting.
In the case of the "block-system" aforesaid the bottom half of the pattern is cast
upon a plate in the usual manner, but the said plate, instead of having holes there-
through to receive pins projecting from the box part, has wings projecting upwards
at the edge of the plate, the said wings being turned internally to receive a band or
fillet which is turned on the outside of the box part in place of the pins aforesaid,
the pins being thus dispensed with. The said wings and band thus form a male
and female joint, being somewhat tapered (or having a draft) in the turned parts to
allow of the box part being readily put into its place and also being readily drawn
off when the mould is rammed up. The box part may be turned on its axis before
being raised to allow the mould the more readily to draw off the pattern.
1
The upper half of the pattern is cast on a turned block forming a band around
the base of the pattern, and wings project downwards from the middle box-part
and are turned internally to fit the said last mentioned band when the box part is
being rammed up. The said last mentioned band corresponds exactly to that on the
first-mentioned box part, so that the band on the first mentioned box part fits
inside the wings of the middle box part when the box parts are put together for
casting.
The drag or third box part for carrying the core fits on to the middle box part by
means of wings as aforesaid, fitting on to a turned band or fillet around or partly
around the circumference of the middle box part.
The box parts are held together for casting by means of set screws screwed
through the wings, their points bearing against the bands or fillets, in which centre
holes may be drilled to receive the said points of the pins if desired.

page_text: Having thus described the nature of the said Invention as it relates to the
"block system" aforesaid, its application to other methods of moulding will be
sufficiently obvious.
In cases where it may be necessary or advisable to place any box-part in a
particular place circumferentially in relation to the pattern or to another box part,
a V shaped or other guide may be cut in one of the wings aforesaid, corresponding
to a projection on the block or on another box part as the case may be.
Oval pots and other hollow ware goods of oval shape may be moulded by means
of box parts constructed as above described, the wings and bands or fillets being in
this case turned upon an oval lathe.