IMPROVE- MENTS IN MOULDS FOR CASTING HOLLOW WARE AND OTHER ARTICLES
Year: 1864

page_text: PROVISIONAL SPECIFICATION left by Joseph Crowley at the Office of the
Commissioners of Patents, with his Petition, on the 14th December
1864.
I, JOSEPH CROWLEY, of West Bromwich, in the County of Stafford,
Moulder, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN MOULDS FOR CASTING HOLLOW WARE AND OTHER ARTICLES," to be as
follows:-
My Invention consists of the improvements herein-after described in
moulds, which said improvements are especially applicable to moulds for
casting articles of the kind called hollow ware, but are also applicable to
moulds for casting all such articles as are or may be cast in moulds formed in
parts opening and closing by a sliding motion.
The object of my Invention is to prevent the formation of the seams or
burrs which are produced on the articles at the junctions of the mould, or to
reduce the said seams or burrs to a minimum..
I will describe my Invention as applied to a mould for casting an elliptical
pot or vessel.
In the ordinary method of making the outer side of the mould two half-
mould boxes are made to slide upon a base commonly called a "drag," and to

page_text: close upon the pattern pot or vessel, from which a mould is to be made,
sufficient space being left between the mould boxes and pattern pot to receive
the necessary quantity of sand to take the impression of the outside of the
pattern pot. The edges of the half-mould boxes are turned inwards, and
constitute cheeks, the said cheeks having the required curvature to make
them fit against the pattern on which the mould is being formed, so that
when the said sand has been introduced and rammed between the half-mould
boxes and pattern there is produced a sand mould, in which the whole inner
surface is of sand, excepting at the junctions of the half-mould boxes where
the turned in edges or cheeks of the sliding half-mould boxes constitute
the vertical edges of the said half moulds. The casting of iron in the said
moulds soon injures the metal edges of the cheeks of the half-mould boxes,
and gives rise to the seams or burrs described on the vertical outer sides of
the hollow vessel.
In making the outer side of the mould according to my Invention I insert
in the pattern pot or vessel in those vertical planes where the mould is to be
divided thin strips or plates of brass or other metal, the said strips being
inserted in slits made in the pattern pot, and either fixed therein or made
moveable. The half-mould boxes which by sliding nearly close upon the
pattern pot have their vertical edges or cheeks turned inwards, but not to the
same extent as in the ordinary mould boxes, so that when the two half-mould
boxes are closed upon the pattern pot or vessel the edges of the cheeks do not
come into contact with the said pattern pot, but bear on opposite sides against
the said vertical strips or plates in the pattern pot. The outer side of the
mould is formed by introducing and ramming sand into the space between the
pattern pot and half-mould boxes. After the inner part of the mould has been
made in the ordinary way the pattern pot is removed, and with it the strips or
plates, and the half-mould boxes afterwards reclosed. The inner vertical
edges of the half moulds which come into contact are thus made of sand, that
is to say, the whole of the inner surface of the outer part of the mould against
which the casting is effected is of sand. The edges of the half moulds being
of sand are renewed each time the mould is made, and the seams or burrs
which in the ordinary method of casting are produced by wear of the metal
edges of the cheeks of the half-mould boxes are not produced when moulds
made according to my Invention are employed.
Although I have described my Invention as carried into effect. by the use of
cheeks on the balf-mould boxes bearing on either side of the vertical strips or
plates of the pattern pot or vessel, yet the said cheeks on the half-mould boxes

page_text: may be dispensed with, the ends of the half-mould boxes in this case bearing
on either side of the vertical strips or plates of the pattern pot or vessel. Half-
mould boxes made in the ordinary way can readily be altered to half-mould
boxes of the kind I employ.