US313315A - Molder s flask - Google Patents

Description

No Model.) 2 Sheets-Sheet 1.

H. H. GARRETT.

MOLDERS FLASK.

No. 313,315. Patented Mar. 3, 1335.-

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HENRY H. GARRETT, OF PITTSBURG, PENNSYLVANIA.

MOLDERS FLASK.

SPECIFICATION forming part of Letters Patent No. 313,315, dated March 3, 1885.

Application filed June 4, 1884. (No model.)

T0 (LZZ whom it may concern.-

Be it known that I, -HENRY H. GARRETT, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of 5 Pennsylvania, have invented or discovered certain new and useful Improvements in Molders Flasks, of which improvements the following is a specification.

In the accompanying drawings,which make part of this specification, Figure 1 is a vertical central section through the nowel portion and follower-board of a flask embodying my invention, illustrating the formation of the nowel portion of the mold; Fig. 2, a similar section 15 through the cope, nowel, and bottom board,

with the mold completed and in readiness for the withdrawal of the pattern; Fig. 3, a similar section through the mold and its accessories when in readiness for the pouring of the metal; Fig. 4, an isometrical view of a portion of the cope; Figs. 5 and 6, vertical sections through one side of the cope, illustrating the operation of the clips which support the sand-retaining bands; Fig. 7, a plan view of one of the locking-pin sockets, and Fig. 8 an isometrical view of one of the sand-supporting bands.

The object of my invention is to provide a two-part flask, by the employment of which molds for castings in metal may be expeditiously and accurately formed and the production of perfect castings facilitated in the particular of resisting tendency to breakage or deformation of the mold during and subsequent to the pouring of the molten metal therein.

To this end my improvements consist in certain novel devices and combinations, hereinafter fully set forth.

In the practice of my invention I construct, in wood or metal and of form and dimensions suited to the character of patterns to be molded, a two-part flask having a cope, 1, and nowel 2, which are adapted to be readily connected and disconnected, as required, bylocking pins or lugs 3, secured to one part and fitting sockets or grooves 4 on the other, the engagement of the pins and sockets retaining the two parts as against lateral or end displacement. The

cope and nowel are, as heretofore, of box form, open at top and bottom, and of similar external dimensions; but their inner sides are each beveled or inclined outwardly from the top of the cope to the bottom of the nowel, so as to present a uniformly-increasing transverse sectional area from the top to the bottom of the Two sandsupporting bands or frames, 5 6, of metal, corresponding in form with the interior of the flask, are adapted to fit freely therein at the meeting faces of the cope and nowel. The greatest dimension in transverse section of the sides of the bands 5 6 is the vertical one,and when in position in the flask one of the bands, 6, incloses the top of the sand which is rammed in the nowel, and the other, 5, incloses the bottom of the sand rammed in the cope. The band 5 is supported in the cope by clips 7, fitted to slide horizontally in guides,and adapted to be moved inwardly or outwardly, as required, by arms 8 on rock-shafts 9, journalcd in bearings on the outside of the cope, and carrying upwardly-extending plates 10, which are pressed outwardly to maintain the clips in position to support the band by springs 11. By pressing the plates 10 inwardly the clips 7 are retracted from the band and the flask may be withdrawn from the sand, leaving the bands in position thereon.

A follower-board, 12, having a central opening to admit such portions of the pattern 13 as project above the parting-line of the mold, serves to close one side of the nowel during the ramming of the sand therein, and the bottom of the nowel is closed bya bottom board, 14., during the ramming of the sand in the cope, said bottom board serving as the support of the mold in the formation of the casting therein. A cap-plate, 15, is placed upon the top of the sand when the mold is completed, and is held in position thereon by clamps 16, bearing at one end on its upper side and at the other on the lower side of the bottom plate, 14.

In the operation of the flask, the pattern 13, which is to be molded, is placed upon the follower-board 12, with the portions which are to be cast in the cope projecting into the central opening of the follower-board. The nowel 2 is then set, bottom upward, on the followerboard, surrounding the pattern, and the sandretaining band 6 laid within it on the followerboard, after which the sand is rammed in the nowel in the usual manner. The bottom board, 14, is then placed on the upper side of the nowel, and the nowel, while held between the follower and bottom boards, for which purpose clamps 17 may be employed, is turned over, when the follower-board, which will then be on its upper side, is removed, and the parting face of the sand finished up and dusted with parting-sand. The ring 5 is then inserted in the cope, resting on the clips'T, and the cope, being placed on the top ofthe nowel, is filled with sand, which is properly rammed. After finishing the top of the cope and withdrawing the sprues, the cope with the contained sand and band 5 is lifted off, the pattern 13 is drawn from the sand in the nowel, and the mold is finished up. The cope is then replaced on the nowel and the clips 7 withdrawn, so as to release the cope from the sand retaining band 5. The clips on opposite sides of the cope may, if desired, be connected, so as to be simultaneously operated. The cope and nowel are then lifted off the sand, their removal being, by reason of the inclination of their inner sides, readily effected, and the sand left in place on the bottom board is inclosed at the parting by the bands 5 and 6. The cap-plate 15 is then placed on the top of the sand and clamped to the bottom board by the clamps 16, and the mold is ready for the metal to be poured.

The employment of the sand-retaini ng bands 5 and 6 interposes an effectual resistance to the lateral pressure of the molten metal, and the upward pressure thereof, which tends to force the mold apart, is counteracted by the cap-plate and clamps in a more convenient and desirable manner than by the action of weights, as heretofore employed.

The provision of supporting-clips on which the sand-band of the cope rests freely in lieu of being secured to the cope by clampingscrews, as has been heretofore proposed, en-- ables the cope to be readily and quickly removed from the finished-mold, and obviates the delay and liability of injury to the mold involved in fixing the sand-band in and releasing it from positive connection with the cope, as in the prior construction referred to.

I claim herein as my invention 1. In a two-part molders flask, the combination of a cope, a sand-retaining band fitting freely therein, and movable clips sliding in guides in the cope below the sand-retaining band, acting as rests for the support of the sand-retaining band therein, substantially as set forth.

2. The combination of a cope, a sand-retaining band fitting therein, movable clips supporting said band, and rock-shafts journaled on the outside of the cope and having arms connected to the clips, substantially as set forth.

3. The combination of a finished mold, consisting of cope and nowel portions, a bottom board adapted to support said mold, a cap plate or frame adapted to rest upon the top of said mold, and clamps for connecting the bottom board and cap-plate, substantially as set forth.

4. The combination of a bottom board and a cap-plate adapted, respectively, to fit against the bottom and the top of a mold, clamps for connecting said board and plate, and a pair of sand-retaining bands adapted to inclose the mold adjacent to its plane of parting, substantially as set forth.

In testimony whereof I have hereunto set my hand.

HENRY H. GARRETT.

Witnesses:

J. SNOWDEN BELL, R. H. WHITTLESEY.

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