Gm Global Technolgoy Operations, Inc.

James Smith, Jr

Karl D Voss

James B Mercer

Paul H Hafer

Gregory A Schaffer

Jeffrey D Porter

Bradley W Hanson

Apparatus for the vacuum, countergravity casting of metal in shell molds including a gas permeable shell mold secured to the mouth of a vacuum box by a plurality of keepers on the ends of rotatable shafts reciprocably slidable through the ceiling of the vacuum box, which keepers are adapted for insertion into and rotation within an anchoring cavity in the mold such that the keeper engages a portion of the mold overhanging the cavity to secure the mold to the box.

Countergravity casting apparatus

Immersion-type vacuum countergravity casting apparatus having a vacuum chamber including spring means for pressing the mold portions sealingly together and/or resisting destructive inward flexure of the mold. A split vacuum chamber, including a floating lower skirt portion, avoids the creation of stress concentration sites between the chamber and the mold.

Growing community of inventors

Saginaw, MI, United States of America

James Smith, Jr