B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/144, 22/161
B22C 7/00 (2006.01) B22C 9/28 (2006.01)
Patent
CA 1154570
Abstract A pattern for forming a sand mold for a one-piece annular casting having a radially inner ring, a radially outer ring, and a plurality of angled blades extending in a spaced, annular array between the rings. The pattern includes a plurality of segments, each having a first end portion defining a portion of the profile of one of the rings, and a second end portion defining the profile of a blade. An apparatus supports the segments in an annular array to define cumulatively a pattern structure corresponding to the configuration of the one ring and blades, and a removable ring coaxial therewith provides a pattern for the other one of the rings. The segments can be supported in annular array about a mandrel and can be circumscribed by a split ring defining the pattern for the outer blade support portion of the casting. The inner portions of the segments can be defined by angled side surfaces which, in alternate ones of the segments in the annular array, converge and diverge toward the center of the array. Upon completion of the forming of the sand mold about the pattern, the mandrel and outer ring can be removed, permitting the segments having the inwardly diverging side faces to be withdrawn inwardly from the array and permit the remaining segments then to be withdrawn inwardly therefrom.
367813
Caterpillar Tractor Co.
Kirby Eades Gale Baker
LandOfFree
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