The Quaker Oats Company

Robert H Fox

Robert J Henning

James E Menting

Roger H Kottke

Miroslav Psensky

Robert F Morgan, Jr

R Bruce Sampsell

Foundry sand mixes comprising a mixture of sand, binder, and hydrogen peroxide are improved with respect to bench life by the addition thereto, at the time of initial preparation of the mixture, of non-catalyzing amounts, but stabilizing amounts, of certain iron chelating agents which are acid or salts of acids selected from those which, in their free acid form, have an acidic pH less than 3.0 when dissolved at 1 percent weight per weight in water or when saturated in water, whichever is lower in concentration.

Foundry sand mixes with improved bench life for curing with sulfur

A flexible, distensible mold for use in fabricating art forms and utilitarian articles, and for use with the aid of air pressure differential enlargement of the shaping cavity, is provided with closeable slits extending from at least a portion of the shaping cavity partly into the mold wall, and cooperating slits extending from the outer wall of the mold into a position which is adjacent to and overlapping the internal slits. With these improved molds a withdrawal bore of the shaping cavity can be greatly enlarged and the side walls can be greatly extended with lower air pressure differentials than would be otherwise necessary. This invention provides a hinging action in the expansion of the side wall which utilizes the flexibility of the mold material to expand the withdrawal bore.

Flexible mold with hinged slits

A flexible distensible mold for use in fabricating art forms and utilitarian articles, and for use with the aid of air pressure differential enlargment of the shaping cavity, is provided with closeable slits extending from at least portions of the shaping cavity partly into the mold wall. With these improved molds the withdrawalbore of the shaping cavity can be greatly enlarged, and the side walls can be greatly extended with lower air pressure differentials than would be otherwise necessary.

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Hoffman Estates, IL, United States of America

Robert H Fox