Improvements in the Method of Preparing the Moulds for Casting Cylindrical Bodies, such as Pipes, and the like.
Year: 1889

page_text: Date of Application, 25th Oct., 1889-Accepted, 30th Nov., 1889
COMPLETE SPECIFICATION.
Improvements in the Method of Preparing the Moulds for Casting
Cylindrical Bodies, such as Pipes, and the like.
I, JACOB MÜLLER, of the City of Burbach, Rhenish Prussia, German Empire,
Manufacturer, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
My invention relates to an improved method of preparing the moulds for casting
cylindrical bodies, either hollow or solid, and has for its object to avoid the usually
necessary stamping of the moulding sand into the moulding box.
The manner in which I prefer to carry my invention into effect is shewn in the
accompanying drawing in which Fig. 1 is a vertical section through the entire
apparatus employed. Fig. 8 shews the moulding box ready for use with the newel K
in position. Fig. 2-7 represent certain details.
Like letters in this description refer to like letters in the drawings.
The moulding box of suitable height for the casting to be made, is placed
upon, and firmly jointed, by screws or otherwise to the disc a, which can be put into
quick rotative motion by means of the gear æ, or in some other convenient
manner.
Above the moulding box is placed a hopper a, containing the moulding sand, and
which can discharge and feed the sand into the moulding box direct.
A vertical shaft c carried by the bracket d passes through the centre of the
moulding box resting on the centre of disc a, and is capable of being turned, to
facilitate which a crank or other suitable mechanism may be provided.
The said vertical shaft c has made in it a longitudinal cutting-out, in which fits a
segment, which, by means of a screw, lever or other, can be either pushed out away
from the shaft, radially and paralel in respect of the latter, as shewn in section in
fig. 3, or pulled home, as in fig. 2.
The manner in which the described contrivance works is as follows:
The disc a and the moulding box b, which is attached to it, having been set into
quick rotative motion, sand is caused to enter the moulding box & from the hopper a,
the feed being continuous and uniform. On account of the centrifugal force that is
active in the quickly revolving moulding box, the sand is thrown uniformly against
the inner wall of the box so that a perfectly even and cylindrical hollow cylinder of
moulding sand is formed.
I
As the centrifugal force decreases towards the centre it follows that the layers of
sand nearest to the vertical shaft are less firmly compressed than those layers nearer
the periphery and in order to be able to specially compress the layers nearest the
central shaft I employ the segment fin the following manner. By working a screw,
lever or such other suitable mechanism as I may have arranged for the purpose
cause the said seginent to be pushed against the sand and thus compressing it (see
fig. 3). I then bring the segment back home into the cutting-out as shewn in fig. 4.
I now turn the shaft somewhat, bringing it into the position shewn in fig. and then
again cause the segment to come out and likewise compress the layers now in front
of it as shewn in fig. 6. In fig. 7 the segment is shewn pulled home after this second
pressing operation has been finished. In this manner I proceed until similar
impressions have been made all round, and as a finish off in order to leave the
impressions thus made perfectly smooth, even and circular I turn the shaft once or
several times quite round with the segment pushed out as in fig. 3, or so far pushed
out as it is desired the diameter of the mould should be.
When the moulding cylinder has been thus finished the vertical shaft c is taken
out, the flanges h h (fig. 8) are formed, if required, the loam or newel K is put

page_text: in likewise if required and the mould covered with a plate in which is provided
the jet and the vent hole m, all in the usual, well known manner, and the mould is
now ready for casting.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. The method of preparing the moulds for casting cylindrical bodies consisting
essentially in causing the moulding box or boxes to be revolved in such a manner that
the centrifugal force causes the sand to become uniformly lodged and compressed
against the sides of the moulding box substantially as described and shewn in the
drawings.
2. The method of specially compressing the layers of moulding sand which, by the
method described in the former claim, become lodged nearest the center, by means of
a movable pressure segment connected to the center shaft substantially in the
manner as described and shewn in the drawings.
JACOB MÜLLER.
Per C. R. Bonne & Co.,
41, Eastcheap, E.C., Registered Patent Agents.
JACOB MÜLLER.
Per C. R. Bonne & Co.,
41, Eastcheap, E.C., Registered Patent Agents.