US253430A - Soft-metal lining for dovetail sockets - Google Patents

Description

(No Model.)

J. A. SANDFORD. SOFT METAL LINING FR DOVETAIL SOUKETS 43o vPatented Feb.

N4 PETERS Pmmlixhagmpher. wnsmngum. D. C.

i, UNrrl-:D STATES PATENT Garten.

Ass.

vTo all 'whom tt may concer-n JAMES A. SANDFORD, OF ALBANY, NEW YORK.

SOFT-METAL LINING FOR DOVETAIL SOCKETS.

SPECIFICATION forming part of Letters Patent No. 253,430, dated February 7, 188.2.

Application filed September 20, 1881. ,(No model.)

A Be it known that I, JAMES A. SANDFORD, of Albany,in the county of Albany and State of New York, have invented a new and useful Improvement in Soft-Metal Linings for Dovetail Sockets and in Modes of Casting Dovetail Sockets, of which the following isa speciication.

- This invention relates to improvements in forming dovetail metal sockets of castmetal,`

but provided with a sheet or softmetal lining, and applicable for various uses, but especially forv securing the legs of stoves in place.

Heretofore considerable difficulty has been experienced in casting dovetail sockets by reason of the undercut or over-hanging shape of the patterns required to form the mold or matrix for the sides of the sockets, which pre-- vents the vertical draft of the patterns from the flask, and to overcome this difficulty the patterns for the dovetail sides of the socket have been made of light wood provided with pins loosely entered into holes in the flat or main pattern-plate, and have been raised with the cope and then drawn from the sand on an incline instead of vertically. Sometimes these dovetail patterns have been made of metal and have been detachably secured to the main pattern-plate hy pins, as shown in Letters Patentv No.-240,502, of April 26, 1881, in which case the flask is turned over, the drag lifted off, the main pattern-plate removed, andthe dovetail patterns drawn out from the mold on an incline. These methods require the handling of several separate patterh-pieces, their adjustment for each use, and their separate removal from the mold, with liability of misplacement and loss as Well as injury to the mold in their removal therefrom.

The object of the present invention is to provide means by which dovetail' sockets can be cast without the use of detachable patternpieces, except as the same form a part ot' the finished socket; also, to provide soft sheetmetal shells, which are used 'as patterns for molding the dovetails,and are lifted and replaced with the cope, and are lunited to the cast'metal by fusion, and form a bearing or holding surface or lining'in the nished socket; and the invention consists in a soft-metal dovepanying drawings, in which Figure lis a view in perspective of a finished dovetail socket, the sides thereof being lined with soft sheet metal. Fig. 2 is a cross-section of the same through the line x of Fig. 1. FigoV 3 is a crosssection of the flask with the patterns and sand in place. Fig. 4 is a view of the same with the cope and sheet-metal shells lifted from the drag. Fig. 5 is a view of the mold with the shells in position, ready to receive the molten metal. Fig. 6 is a view in perspective of the sheet-metal shell. the main pattern with fixed rib, and Fig. Sris a view of a piercd pattern.

In thev drawings, A represents the bottom plate ,of a stove or other surface on or With which the dovetail socket is cast.

B'is the socket, its overhanging or dovet-ailsides being represented by a.

G is a sheet-metal shell tted and'united by fusion to the cast-metal.projections D D, and forming the inclined or dovetailsurfaces or sides'ofv the socket B.

E represents the main pattern-plate,'pro

pose, and is conveniently struck up to the required form in dies, its surface or side a being sufficiently inclined to give the required dovetail to the mold and to the finished socket, and a portion of the metal of the shellpreferably Fig. 7 is a side elevation of IOO the ends b of the inclined side a-bein g turned down or folded over the open ends of the shell, so that when it is placed over one of the ribs F of the pattern the foldedover metal of the shell will slightly overlie the ends of the rib and prevent the shell from being moved out of position during the molding.

The ribs F F may be, and for convenience should be, fixed to the main pattern-plate E. The sides c c of the ribs F F are not inclined to correspond with 'the inclined sides of the shells C, and therefore do not overhang their intervening space, but, on the contrary, are inclined in the opposite direction, so as to permit of the free vertical draft of the shells C. rlhe sole function ot' the ribs or projections F F is to position and hold the shells C in place during the operation of molding, and consequently they may be of any size and shape relative to the shells which will accomplish this result and at the same time permit the free vertical draft of the shells. The'shape ofthe body ofthe shells is not confined to that shown in the drawings, as it is evident that instead of the curved surface shown they may be angular or of other desired shape. The shapes both of the ribs and the shells shown in the drawings are intended to represent preferable forms for stove-leg sockets.

The method of casting the socket is described as follows: The pattern E, carrying the ribs F F, is molded in the drag in the usual manner and brought into position to receive the cope. A shell, G, is placed over each rib F, the shells, when in position in the mold, being separate and disconnected from each other, the cope placed in position and then rammed up with sand or loam, as seen in Fig, 3. The cope is then lifted from the dra g and the main pattern, and the shells C are, by reason of their dovetail shape and the adhesion of the sand, held in the cope, the shape of the ribs F readily permitting the shells to be raised vertically with the cope, as seen in Fig. 4. The pattern E is then removed from thedrag, the cope returned to position, and a matrix or mold, with the sheet metal shells in proper place, is thus formedv to receive the molten metal, as shown in Fig. 5. The molten metal, admitted in the usual manner, fills the mold, and, coming in contact with the inner surface of the shells, partially fuses them, and as the metal cools the shells are firmly secured in place.

It is frequently necessary to raise the dovetail sockets away from the main surface of the plate-as, for instance, in the bottom of stoveplates,where there is a flange projecting downward from the edge of the plate-iu order to bring the socket into the plane of the flange, so that the shank of the leg can be inserted. To accomplish this the pattern ribs F are mounted on piers or blocks d, provided with ledges or project-ions e, against which the edges of the shank of the leg of the stove or other article rests or bears. The shells C can be used with great advantage in this construction, inasmuch as in molding the sand or loam will till the space between the adjacent piers, and thus materially reduce the quantity -ot' metal vrequired for casting the piece.

It is readily seen from the above description that sockets made by this method will have their dovetail sides, which form the main bearing and holding surfaces for cast-metal shanks of stove-legs and other articles inserted therein, covered with sheet metal, which, as the castmetal shanks are forced into place, wlill, by-

reason of its superior softness and malleability, conform to any slight inequalities upon their surfaces and firmly hold them in position.

What is claimed as new is- 1. A sheet-metal shell, C, having an inclined side or face, a, and having its ends partly closed by the turned-over metal ot the shell, whereby it is adapted to form a part of the pattern for molding dovetail sockets and a lining for the sides or bearing-surfaces ofthe finished sockets, substantially as described.

2. The combination, in molding' patterns for dovetail sockets, of fixed ribs or projections F and separate or disconnected sheet-metal shells C, substantially as and for the purpose described.

JAMES AUSTIN SANDFORD.

Witnesses:

DAVID S. SAXE, FLETCHER VosBUnoH.

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