US2272709A - Flask corner - Google Patents

Description

Feb. 10, 1942.

J. F.H|NES FLASK CORNER Filed July 20, 1940 14 INVENTOR. BY c/AMES F. H/NEs Pic-3.4

ATTORNEY.

Patented Feb. 10, 1942 FLA'SK CORNER .lames;F.lHines, Lakewood, Ohio, assignor to Hazel K. Hines, Lakewood, Ohio 3 Claims.

This invention which is a continuation in part I of my co-pending applications S. N. 248,668, filed December 31, 1938, and 307,993, filed December 7, 1939 (Patents 2,223,563 and 2,224,961) relates to foundry flasks and particularly to snap flasks, that is, the type which open and close by horizontal movement between the flask sections. One difiiculty encountered with snap flasks in closing them is that when sand becomes lodged on the Opposed edges which close at the corners, such sand thereby prevents complete and accurate closing and so keeps the flask from making a mold of identically the same size each time. This difliculty necessitates brushing or wiping these corner edges, or, as shown in my co-pending applications S. N. 307,993 and S. N. 248,668, beads or ridges may be used on such edges to minimize the space on which sand can lodge.

My co-pending applications disclose a corner construction wherein the approach of the corner edges is primarily determined by the horizontal guide means, specifically by the seating of certain dowels in their sockets. When the closing approach of the corner edges is limited by the guide means, such beads may be omitted entirely, and no parts of the flask corner edges will come into actual contact when the corner is closed. Although some flask users prefer such beads, I have found that mold sand does not escape at the corners if the corners are closed without actual contact of the adjacent edges, leaving a clearance of an eighth of an inch.

In the accompanying drawing Fig. 1 is a perspective of a complete flask embodying the present invention, the flask being closed and cope and drag assembled one upon the other, although without any mold shown therein;

Fig. 2 is an elevation of a flask corner to which my invention is applied, showing the drag only, the corner being considerably enlarged from the scale of Fig. 1 and shown in closed position, with a mold therein;

Fig. 3 is a view corresponding to Fig. 2 but showing the parts in open position and omitting the mold;

Fig. 4 is a horizontal section on plane 9-4 of Fig. 2;

Fig. is a horizontal section on plane 55 of Fig. 3, omitting the mold.

In the description and claims, for uniformity of expression, wall is used to mean either a side or an end of either a cope or a drag, flask section means two walls connected by an immovable corner, flask half means either an entire cope or an entire drag. In the claims flask means either a whole flask or a flask half.

My present invention, like that illustrated in my co-pending applications S. N. 248,668 and 307,993, provides a flask which has a lateral opening arrangement whereby the corners can be unlocked and the flask sections thus separated horizontally a short distance. The opening and closing mechanism and the means for aligning the flask halves are not illustrated in detail here, i

but may be of any suitable form.

My invention is illustrated in Fig. l as applied to two flask halves, of which the cope l is assembled on top of a drag 2 by the usual means, here shown as conventional pins 5. Cope and drag are each separable horizontally into two sections IA and IB in the cope, 2A and 2B in the drag. The division are along vertical parting edges at diagonally opposed corners l and 8 for the cope, 9 and I 0 for the drag. The other pair of corners of each element are permanently immovable, preferably assembled as shown b my Patent No. 2,006,240.

As shown in Figs. 2 and 4, the flask sections 2A and 2B (like IA and IB which correspond but are not shown in detail) have opposed faces H and I2 defining their parting edges, and are guided for movement by dowels l3 seating in on shoulders H8 in their respective sockets. The opening and closing mechanism, which may be of any suitable character, is here shown as including camming handles iii, a through bolt H, and a separating spring I8.

When the flask sections are in closing position, Figs. 3 and l, the distance between faces H and I2 is on the order of from about one-sixteenth (rs) to one-eighth of an inch, a clearance greater than the thickness of a single grain of sand, but small enough not to permit escape of the wet mold sand. Although some sand of the mold M will move out into the clearance space, as shown in Fig. 4, this effect will cause nothing more serious than a flash or fin on the mold corner, easily knocked off by the jacket, without injury to the mold.

The closing of the flask sections is determined by the seating of the dowels I3 on their shoulders M, which may be vented at the bottom as shown in Figs. 4 and 5. Since the faces II and I2 never make contact with one another, any lumps of sand which adhere to the faces will be mashed down and the material of which they are composed will escape laterally, and thus cannot stop the approach of the faces. As a consequence, the dimensions of the mold cavity formed by the closed flask will never vary.

Although I have herein described and illustrated my present invention in a preferred embodiment, it will be appreciated that the principles thereof may be applied with other mechanical details, and that the foregoing is illustrative rather than limiting.

What I claim is:

1. A snap flask characterized by separable corner constructions including opposed parting edges, said corner constructions comprising in combination interengaging transverse dowels connecting said edges, passages through said corners wherein said dowels are engaged, said passages going through and being contained entirely within the wall thickness of the respective corners, said passages being reduced in size intermediate their ends thereby to limit distance of entrance of said dowels into said passages.

2, In a separable corner foundry flask, guide means enclosed within the wall thickness of a flask corner, said guide means comprising dowels and vented sockets, and stops so related to said dowel portions as to prevent travel of said dowel portions out of said sockets.

3. In a separable corner foundry flask having parting edges joined by guide means, guide sockets within the Wall thickness of a flask corner, guide dowels received in said sockets and stops for said dowels in said sockets limiting the closing approach of said parting edges to a distance greater than the thickness of a grain of sand but less than the distance bridged by the molding sand.

JAMES F. HINES.

Images