US2799064A

US2799064A - Founder's moldboard

Info

Publication number: US2799064A
Application number: US398588A
Authority: US
Inventors: Schucker Robert; Palmer Larry
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-12-16
Filing date: 1953-12-16
Publication date: 1957-07-16
Anticipated expiration: 1974-07-16

Description

July 16, 1957 R. SCHUCKER ETAL 2,799,064

FOUNDERS MOLDBOARD Filed Dec. 16, 1953 I 2 SheetsSheet 1 'Tnyanfor's V 1 V mmmm I mam Mfornqy July 16; 1957 R. SCHUCKER ET AL FOUNDERS MOLDBOARD 2 Sheets-Sheet 2 Filed Dec. 16. 1953 Waz" lnueniors I r Q 2 n c um w mm w SPQ 9 M wa B United States Patent FOUNDERS -MQLDBOARD Robert Schucker and Larry Palmer,lvluslregon,.Mich.

Application December 16, 1953, Serial No. 398,588

.6 filaims. ;(Cl. 229-9) This invention relates to a'founders mold board used in. making sand molds in which metal castings are formed.

The customaryprocedure in foundry practice has been to form the sand mold in a'molders flask and to provide a bottom board for each mold which bottomboard would remain with the mold during the casting operation.

The usual pouring operation in a foundry involves the use of agreat many molds with their-flasks andbottom boards which are expensive to furnish in the first place and also maintain in serviceable condition since they become damaged in use and must berepaired or replaced.

The 'present-invention conceivesameans by which a mold board may be substituted for the conventional bottom board during the molding operation and then removed from the flask and re-used time after time with each flask during each molding operation. The mold board does not remain with the mold during the casting operation and, thus, the large number of bottom boards previously used are completely eliminated with the considerable saving of their cost and upkeep.

The invention is hereafter more fully described with reference to the accompanying drawings in which,

Fig. l is a perspective view of a molders flask, the upset frame and the mold board in disassembled relation.

Fig. 2 is a sectional elevation of the flask and upset frame with the mold partially formed therein,

Figs. 3, 4, 5, and 6 are views similar to Fig. 2 with the mold board in place showing successive steps of the molding operation,

Fig. 7 is a plan view of the hinged supporting member for the mold board, and

Figs. 8 and 9 are enlarged fragmentary sections of a lower corner of the mold parts in successive steps of operation.

Like reference numbers refer to like parts in all of the figures.

The molders flask consists of upper and lower parts called the cope 1 and the drag 2 which are in the nature of open frames placed one upon the other, the cope being uppermost in the finished mold. In the standard molding operation a pattern plate 3, on which is a pattern 4, is

. located between the cope and drag and with the drag upplates 6 at its outer edge which fit over the outside of the drag 2 holding the frame in proper position. The drag is then filled with sand and jolted and the sand struck off flush with the top of the upset frame 5. This operation is shown in Fig. 2.

At this point in the molding operation, the mold board 7 is placed on the sand above the upset frame as shown in Fig. 3. The mold board 7 is flat, having an outside dimension slightly smaller than the interior size of the upset frame. At opposite sides of the'mold board are located supporting members each of which comprises two

leaves

8 and 9 hinged together and provided with a 2 spring 10 at the pivot which normally tends to hold the

leaves

8 and 9 in outstretched relation to each other but which will yield under pressure to permit pivoting of the leaves. The leaves 8 are attached to a surface of the mold board 7 at opposite edges thereof and the leaves '9 project outwardly beyond the edges of the mold board and rest upon the surface of the upset frame 5 as shown in Fig. '3.

The next operation is to roll the flask over tothe position of Fig. 4and then the cope 1, which is now uppermost, is filled with sand above the pattern plate 3 and jolted and struck off flush with the top of the cope. -In this position, and during this operation, the mold board 7, which has feet 11, rests upon 'a table 12 and supports the flask and moldby the outward projecting leaves of the supporting members, the springs 1 0 being strong enough to carry this load.

The next operation is toplace a squeeze board '13 on top of the sand in the cope and to squeeze the sand'in the mold in a vertical direction, as by pressure exerted by a molding machine, asshownin Fig. 5. This squeezing pushes the squeeze board fifip'artlyinto the cope and-the mold board 7 partly into the upset frame 5 vand inso doing theprojecting leaves 9 ref-the supporting-membersiare folded downwardly so astogpassinside the-upset'frame.

Following the foregoing operation, the j squeeze b oard Bisrefnoved and-the pattern plate 3 and 'patt'ern 4 1are also removed by temporarily lifting of the cope which is then replaced. After this is done, the upset frame is pushed clear down upon the table 12 by means of handles 14 which entirely frees the upset from the flask and mold leaving the mold sitting upon the mold board 7 from which it is lifted and removed to a convenient place for the casting operation, there being no further use for the mold board with this mold.

If desired, the edges of the mold board may be notched at 15 to receive the leaves 9 of the supporting members when folded and also the faces of the upset frame may be protected against wear by metal plates 16 at the points engaged by the leaves 9.

By this structure and method the pivoted leaves 9 of the supporting members support the flask and mold upon the mold board during the molding operations but yield to release the upset frame when the mold is finished so that it may be removed from the mold board which is used repeatedly in subsequent molding operations and the use of the conventional bottom board with each mold is eliminated resulting in a considerable saving in the expense thereof.

The invention is defined by the appended claims which are to be considered comprehensive of all forms coming within their scope.

We claim:

1. The combination with a molders flask and an upset frame removably located against an edge of the flask, of a mold board of a size that will pass through said upset frame; supporting means mounted on said mold board one on each of two sides thereof; said supporting means having a pivoted leaf extending outwardly from said mold board for engaging said upset frame; yieldable means adapted to resist pivotal movement of said leaf, the resistance of said yieldable means being sufficient to support said upset frame.

2. In a combination mold board and upset frame, said mold board being adapted to pass through said upset frame, the improvement comprising: a support on at least two margins of said mold board; each of said support elements having a hinged leg adapted to project outwardly from said mold board; means for resiliently resisting pivotal movement of said leg with suflicient force to support said upset frame.

3. In a combination mold board and upset frame, said mold board being adapted to pass through said upset frame, the improvement comprising: a support on at least two margins of said mold board; each of said support elements having a hinged leg, said leg being adapted to move from a first position parallel to the plane of said mold board to a second position normal thereto; means for resiliently resisting pivotal movement of said leg from said first position to said second position with sufiicient force to support said upset frame.

4. In a combination mold board and upset frame, said mold board having a mold support platform and a support surface and being adapted to pass entirely through said upset frame, the improvement comprising: a support element mounted on each of two opposite marginal edges of said mold board; said support elements adapted to resiliently resist movement of said mold board through said upset frame with sufficient force to support said upset frame, said suppor elements being yieldable to permit said upset frame to pass down over said mold board; said mold board having a thickness measured between said mold support platform and said support surface greater than the thickness of said upset frame whereby when said upset frame is pushed down about said mold board it passes down below the level of the mold support platform.

5. In a method of molding, the steps which include: forming a sand mold in a flask and upset frame; supporting said mold upon a mold board; supporting said flask upon said upset frame; yieldably supporting said upset frame upon said mold board; simultaneously compressing said mold to permit said mold board to enter said upset frame and urging said upset frame downwardly about said mold board; stripping said upset frame from said flask by moving it downwardly about said mold board until said mold board has passed through said upset frame.

6. In combination with foundry molding equipment including a cope, a drag, a pattern plate located between said cope and drag, and a mold board having a mold support platform on one side and a support surface on the other side, the improvement comprising: an upset frame adapted to seat on the edge of said drag remote from the edge on which said pattern plate is seated; said upset frame having a central opening adapted to receive said mold board; yieldable support means for normally supporting said upset frame upon said mold board, said yieldable support means being releasable when force is applied to said upset frame permitting said frame to be pushed down about said mold board; said mold board having a thickness measured between said mold support platform and said support surface greater than the thickness of said upset frame whereby when said upset frame is pushed down about said mold board it passes down below the level of the mold board support platform.

References Cited in the file of this patent UNITED STATES PATENTS