Improvements in Devices for Moulding Leg-sockets for Stoves.
Year: 1891

page_text: Date of Application (in United Kingdom), 24th Sept., 1891
Complete Specification. Left, 24th Sept., 1891 Accepted, 24th Oct., 1891
Complete Specification.Left, 24th Sept., 1891 Accepted, 24th Oct., 1891
COMPLETE SPECIFICATION.
Improvements in Devices for Moulding Leg-sockets for Stoves.
We, JAMES MCDERMOTT, of Louisville,. Jefferson County, Kentucky, United
States of America, Stove Manufacturer, and LAZARD KAHN, of Hamilton, Butler
County, Ohio, United States of America, Stove 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 :-
Leg-sockets on stoves are generally formed by a pair of ribs cast upon the under
side of the stove-bottom, the inner walls of these ribs being angular to form dove-
tailed recesses, to receive the dovetailed shanks of the legs. If in moulding these
ribs the ribs are fastened permanently to the pattern of the stove-bottom, then the
ribs will not draw from the sand. It is therefore customary to dowel the rib-
patterns loosely to the pattern of the stove-bottom, so that when the bottom-pattern
is drawn from the sand the ribs remain in the sand to be withdrawn separately
subsequently. This plan involves small loose pattern-pieces, always objectionable,
and they are apt to get slightly displaced while in use and destroy the accuracy of
the dovetailed socket in the ultimate casting. In some cases the dovetailed sockets
have been separately formed and left within the mould, the metal of the stove-
bottom uniting with such sockets by process of fusion; but there are many
objections to this system.
Our improvements will be readily understood from the following description,
taken in connection with the accompanying drawings, in which―
Figure 1 is a perspective view of our improved chill-core;
Fig. 2, a vertical section of a portion of the pattern of a stove-bottom ready. to
be withdrawn from the sand, and shown in connection with our improved chill-
core; and
Fig. 3, a vertical section of a portion of a stove-bottom with dovetailed leg-
socket, of usual form and as produced by our improved apparatus.
In the drawings, A indicates a portion of an ordinary stove-bottom; B, the usual
ribs cast upon the under side of the store-bottom to form the dovetailed socket for
a leg; C, the dovetailed leg-socket formed between the ribs; D, the pattern
employed by the moulder in producing the mould for the stove-bottom, this
Bottom-pattern being substantially a duplicate of the casting to be produced;
E, the ribs upon the under side thereof to produce the ribs B of the leg-socket,
these ribs E of the pattern, however, having their inner walls straight or without
any dovetail characteristics, or, if desired, even bevelled somewhat the reverse of
the dovetail, the ribs being secured permanently to the pattern of the. stove-
bottom; F, the sand forming the mould for the under surface of the stove-bottom,
Fig. 2 showing the bottom-pattern as being ready for withdrawal from the sand;
G, a device, herein termed a "chill-core," to be used in connection with the pattern

page_text: and sand to form the dovetailed leg-sockets in the casting of the stove-bottom, this
device consisting of a skeleton plate of metal, preferably of cast-iron, having its
two opposite edges in dovetail form corresponding with the form of the shank of
the leg which is to fit into the leg-socket of the stove-bottom; H, the two side
ribs of the chill-core, corresponding in edge contour and in width across from one
outside edge to the other to the contour and width of the leg-shank to be employed
in the leg-socket; I, a cross-bar connecting the two edge pieces of the chill-core,
this cross-bar being preferably depressed downwardly, as seen in Fig. 1; J, a prong,
of which there may be more than one, if desired, projecting downwardly from the
chill-core, and shown as projecting from the cross-bar; K, sand in the mould
between the stove-bottom pattern and the depressed cross-bar, and L flanges
projecting outwardly from the chill-core at the base of its two dovetailed edges.
The pattern for the stove-bottom is made, as indicated in Fig. 2, with the ribs E
permanently attached to it and having, as explained, no dovetails upon their inner
walls. The chill-core is to fit up in between these ribs, as shown in Fig. 2, with
the flanges L resting against the lower surfaces of the ribs E to prevent sand from
entering the angular recesses formed between the inner walls of the ribs E and
the outer dovetailed walls of the chill-core.
The moulder takes his pattern in hand and places the chill-core between the
ribs E, the chill-core then becoming a part of the pattern. He then rams his
mould, tucking sand at K between the plate part of the pattern and the depressed
cross-bar I, if the depressed cross-bar be employed. If the cross-bar be not
depressed, then no tucking will be required. Having rammed the flask in the
usual manner, and having opened the flask, the moulder now lifts the pattern D
from the sand. The chill-core remains in place, being held in the sand by the
prong J. The flask is now closed and the metal poured, as usual. The metal will
fill the mould-spaces formed by the ribs E and will flow up against the dovetailed
walls of the chill-core. When the casting is shaken out, then the chill-core is
knocked out end wise, leaving a leg-socket having smooth dovetailed surfaces cast
upon a chill and of accurate form. The chill-core may, instead of being open at
the centre or of skeleton form, be flat and plate-like, the object of the open centre
and depressed cross-bar being to permit as much sand as practicable to get to the
under surface of the bottom-pattern, so as to reduce the area of bottom-casting
which will be chilled.
Fig. 2 illustrates the stove-bottom as being moulded bottom downward, but it
will be readily understood that the sand shown in Fig. 2 may be the sand of the
cope or the sand of the drag, as desired. If the lower surface of the bottom-
pattern is moulded in the drag, then the cope will be lifted off, and then the
pattern will be lifted from the drag, leaving the chill-core in the drag. If,
however, the upper surface of the bottom is moulded in the drag, then the cope
will be lifted off, bringing the chill-core with it and leaving the pattern to be
lifted from the drag, as will be readily understood by viewing Fig. 2, turned
upside down.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
1. In a device for moulding leg-sockets for stoves, a chill-core having dove-
tailed edges and flanges at the base of the dovetails, and adapted for use
substantially as set forth.
2. In a device for moulding leg-sockets for stoves, a chill-core having two
flanged and dovetailed side bars connected by a cross-bar, and adapted for use
substantially as set forth.
3. In a device for moulding leg-sockets for stoves, a chill-core having two
flanged and dovetailed side bars connected by a depressed cross-bar, and adapted
for use substantially as set forth.

page_text: 4. In a device for moulding leg-sockets for stoves, a chill-core having dove-
tailed and flanged side edges and having a laterally-projecting prong, and adapted
for use substantially as set forth.
Dated this 24th day of September 1891
ALLISON BROS.,
Agents for the Applicants.