Iм- PROVEMENTS IN THE CONSTRUCTION OR ARRANGEMENTS OF MOULD CORES USED FOR CASTING PIPES AND ANALOGOUS ARTICLES
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by Joseph Toussaint at the Office
of the Commissioners of Patents, with his Petition, on the 20th
August 1875.
I, JOSEPH TOUSSAINT, of Sparkbrook, Birmingham, in the County of
Warwick, do hereby declare the nature of the said Invention for "Iм-
PROVEMENTS IN THE CONSTRUCTION OR ARRANGEMENTS OF MOULD CORES USED FOR
CASTING PIPES AND ANALOGOUS ARTICLES," to be as follows:-
This Invention relates to improvements in the construction or
arrangements of mould cores used for casting pipes and analogous
articles," and consists in making cores in longitudinal segments or
divisions, preferably four. Each segment or division has a curved
under face on one edge and a curved outer face on the other edge, so
that the under face of the edge of one segment may bear upon or
against the outer curved face of the neighbouring segment and be free to
slide thereon when the segments are cramped or built up to form a
perfect circle or core. The external surfaces of each segment have holes
bored or otherwise formed in them for the reception of the coating of
loam or founders' blacking, the holes serving to hold or bind the
founders' blacking upon the exterior when applied as a plaster.

page_text: Instead of the holes studs, ribs, or projections may be formed upon the
segments for the same purpose, these being so made or formed that the
loam may be held thereon. The studs, ribs, or projections are preferably
of smaller area at the base than at the exterior face. Holes between
the bottom and the ribs are formed in each segment to permit the
escape of air. Each end of each segment is cone shaped for the
reception of binding or clamping caps or end pieces, the distance to
which the caps are fitted along the cones determining the closeness of
contact of the segments.
The segments when built up form a tube in themselves, and springs
are fitted in the inner part at each end and the middle if necessary to
keep the segments expanded while the core is being prepared and
coated, but which yield on the contraction of the metal taking place
after the casting operation has been effected.
The segments can be removed singly after the end caps are taken off,
and the loam or blacking upon the exterior upon which the casting has
been accomplished can then be knocked or scraped away, the segments.
built up afresh, and recoated for the next casting operation after the loam
has become set and dry.
According to another construction or arrangement I employ an 2
inner tube, or it may be a solid plug with radial projections upon the
outside, each projection having a base of less width than the outer
face. Upon this tube or plug I arrange grooved bars, the shape in
cross section corresponding to the shape of the radial projections but
slightly larger, a space being left between the projections and the 2
grooved bars to permit of the shrinkage or contraction of the metal pipe
when cast thereon. The grooved bars have flanges on their inner faces
which meet or almost meet at the edges, which rest upon the central
pipe or plug, and the grooved bars have springs fitted within them to
bear .upon the radial ribs, which-springs also permit of the grooved bars 3
approaching the central tube or plug on the contraction of the metal
taking place. The core or mould made up of the central tube and the
grooved bars are coated with loam or other usual refractory material to
the desired thickness, and arranged in a box or exterior frame, between
which and the core the fluid metal to form the pipe is poured.
The exterior portion of the mould or box can be arranged with radial
ribs on the interior, and these may have grooved bars to fit them, as
3

page_text: for the cores, the inner face being coated with loam in the usual
manner.
The coating of loam according to the foregoing plan is so to speak
divided into segments, and when the casting is complete the central
5. tube or plug can be withdrawn "end on," the grooved bars with the
separate coatings of loam being then free to be removed by hand