US1869908A - Apparatus for molding cast iron pipe and the like - Google Patents

Description

.1. R. M WANE 1,869,908

N PIPE- AND THE LIKE Aug. 2, 1932.

APPARATUS FOR MOLDING CAST IRO Original Filed March 19, 1928 guy/42 g'wu'zw iow James R. M Wane,

Patented Aug. 2, 1932 STATES PATENT OFFICE JAMES R. MCWANE, OF BIRMINGHAM, ALABAMA, ASSIGNOR TO MCWANE CAST IRON PIZ E COMPANY, OF BIRMINGHAM, ALABAMA, A CORPORATION OF ALABAMA APPARATUS FOR MOLDING CAST IRON PIPE AND THE LIKE Original application filed March 19, 1928, $eria1 No. 262,683. Divided and this application filed January 1 1932.- Serial No. 536,616.

This invention relates to improvements in apparatus for molding cast lron plpe and the like and, among other ob ects, alms to pro vide an improved pattern plate so made as filed March 18, 1930, allowed November 19,

1931, which in turn was a division of my application, Serial No. 262,683 filed March 19, 1928, now Patent No. 1,765,021, dated June 17, 1930.

Referring to the accompanying drawing showing a preferred embodiment of the intention Fig. 1 is an elevation of a portion of a jolt rammer with the pattern plate thereon,

. the attern being in section and a flask section shown above the pattern plate in cross section and ready to be rammed; and

Fig. 2 is a sectional view, on an enlarged scale, of one wall of a flask section and one pattern shown adjacent said wall, together with part of the jolt rannner.

To speed up production and to economize in the manufacture of cast iron pipe and the like, when made by the green sand, horizontal casting process, it is highly desirable to employ the jolt ramming machine. To use this ramming apparatus successfully, it is necessary to employ pattern plates or match plates. Such pattern plates have one-half of the pattern secured to them and are so made as to permit lifting of the flask sections off them after the olt ramming. In the process of molding, each pattern plate in one operation forms one-half of one or more pipe molds and. these halves (the flask sections) are subsequently matched toget-her, with the cores properly placed in the molding space to make the complete mold. in so using a pattern plate, particularly when the mold is very long, say about 20 feet, it is very difficult to prevent what is I called rattling, this being a sticking of the sand along the edges of the pattern, when lifted, which results in an imperfect mold. It will be readily understood that ratting is much more easily prevented when the pat- .tern is dropped through the stripping. plate away from the mold, as in the old process, than it is when the flask section, with the molds formed therein, is lifted from a stationary pattern attached to the pattern plate. The present invention provides a pattern plate so madeas to give a perfect lift, that is, a clean separation of the mold from the pattern plate, without injury to or misshaping of the mold. Referring specifically to the drawing, there is shown, in Fig. 1, the drag section 10 of a multiple pipe flask, together with part of a jolt ramming machine, said flask being described and claimed in'Patent No.

1,765,021 and also in the parent application, Serial No. 436,7 51. The drag section is which the present application is most intimately related, there isv shown a portion of the pattern plate 11, one of the half patterns 12, and a portion of the adjacent side wall 13. of the drag. The side wall has a flat inner fillet 14, the purpose of which is to direct the pressure on the sand toward the side edge of the pattern during the ramming, and to support the sand when the drag is lifted from the pattern. The sides of the pattern, at their junctions with the patternv plate, are shown as having slightly flattened surfaces 15, inclined slightly toward each other. The taper and dimensions of the surfaces are greatly exaggerated in'the drawing, so that such surfaces may be seen. The extent of flattening is only a few thousandths of an inch, so that it cannot be seen by the untrained eye. The eflect is that the sand will be packed more tightly in the narrow space between the flask wall 13 and pattern 12 than if the surfaces 15 were not provided.

It has been found by thousands of trials, carried out over a period of many months, that the sand is much better packed in the toe of the mold, and that the drag can be;

shownattached to a pattern plate 11 on the i removed without any ratting, when the flattened surfaces 15 are provided. It has also been found that when the metal is cast,

the flattened portion of the sand mold, being of a softer consistency, than the more highly compressed sand in less restricted parts of the mold, is compressed very slightly by the heavy molten metal, thus compensating for the flattened portion of the mold and forming an annular casting of uniform thickness.

Obviously, the present invention is not restricted to the particular embodiment thereof herein shown and described.

What I claim is 1. A pattern plate for molding cast iron pipe and the like having a pattern part on its face; said pattern part having plane vertically tapered surfaces instead of curved surfaces at and near its junction With the face and extending a sufficient distance from said junction to permit a more perfect packing of the sand and afterwards a substantially perfect' separation of-the rammed sand in the flask from the pattern. Y

2. A pattern plate for molding cast iron pipe and the like having a half-round pattern secured thereto, and having very slightly flattened cut-away portions at the edges of he pattern such as to permit a rammed flask section to he lifted from the pattern Without ratting, all Without in any Way distorting the resulting casting.

8. A pattern plate for molding cast iron pipe and the like having a half round pattern whose outer surface is very slightly cutaway at its lines of juncture with the plate; the extent of flattening amounting to a few thousandths of an inch.

In testimony, that I claim the foregoing as my own, I have hereto affixed my signature.

' JAMES R. Mol VANE.

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