IMPROVEMENTS IN MOULDS FOR MAKING CASTINGS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, WILLIAM SHAW of Wolsingham in the County of Durham, Steel Works,
Manager do hereby declare the nature of said Invention for "IMPROVEMENTS IN
MOULDS FOR MAKING CASTINGS" to be as follows:-
My Invention has for its object to prevent straining in contraction on the cooling
of the castings and therefore to avoid the cracks and defects resulting from this
straining. The Invention is especially applicable to the making of mild steel
castings.
According to my Invention I make the moulding box in parts upon which
springs or wedges or analogous mechanical contrivances act so as to cause the
moulding box to contract as the castings contracts. By this means subsequent
annealing of the casting may be dispensed with.

page_text: COMPLETE SPECIFICATION.
I, WILLIAM SHAW, of Wolsingham in the County of Durham, Steel Works
Manager, do hereby declare the nature of said Invention for "IMPROVEMENTS IN
MOULDS FOR MAKING CASTINGS" and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
My Invention has for its object to prevent straining in contraction on the
cooling of the castings and therefore to avoid the cracks and defects resulting from
this straining. It also allows of steel castings being made of a softer class of metal
Time and
than has hitherto been used thus preventing internal shrinking.
expense are saved owing to no feeding heads having to be made with the castings..
The Invention is especially applicable to the making of mild steel castings.
According to my Invention I make the moulding box in parts upon which
springs and wedges or analogous mechanical contrivances act, so as to cause the
moulding' box to contract as the casting contracts. By this means subsequent
annealing of the casting may be dispensed with, and in order that my Invention
may be clearly understood I shall now proceed more particularly to describe the
same and for that purpose shall refer to the accompanying Drawings the same letters
of reference indicating corresponding parts on all the Figures.
Figure 1 is a longitudinal section and Figure 2 is a plan of part of a mould box
provided with means according to my Invention for allowing it to contract with
the casting.
Between the lugs A of the mould box are placed wedges or filling pieces B one
of which is shewn in side and edge views in Figure 3. Bolts D pass through the
lugs A and pieces B the holes therefor through the said wedges extending to the
bottom of the wedge as shewn at b, Figure 3. Springs C are placed upon
the bolts D between the nuts d and the lugs A, the said springs tending to force
the parts of the mould box together with power which can be brought to bear by
screwing up the nuts d. Bolts E are passed through the lugs A, and wedges B,
before the casting is made. After the casting is made the bolts E are removed and
the wedges B are withdrawn which may be effected by a forked lever like that
shown of Figure 4 being inserted under the beads of the wedges; the mould box
is then at liberty to contract with the casting.
The Invention may be applied to any kind or form of mould and can be adapted
to existing moulds by cutting the mould box where required and fixing the
appliances according to my Invention.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is :-
1. In moulds for making castings the provision of means for rendering the said
moulds capable of contracting as the casting contracts substantially as hereinbefore
described.
2. The arrangement and combination of parts or appliances hereinbefore
described and illustrated by the accompanying Drawings for application to moulds
to render them' capable of contracting as the casting contracts.
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