Abstract: A helical structure having a shaft defining an axis of rotation and a substantially helical flight extending about the axis of rotation and composed of a plurality of sections each having a segment disposed in substantially right angular relation to the axis of rotation. A method for manufacturing a helical structure or the like including the steps of producing a mold having a mold cavity defining a configuration for the helical structure having a substantially helical flight composed of a plurality of sections having segments disposed in substantially right angular relation to an axis of rotation for the helical structure, introducing a moldable substance into the mold cavity to form the helical structure in the configuration and removing the helical structure from the mold cavity by separating the mold along a path substantially aligned with the segments.
Type:
Grant
Filed:
June 29, 1993
Date of Patent:
March 12, 1996
Assignees:
The Vendo Company, Wrex Products, Inc., a part interest
Inventors:
Daniel S. Carter, Dennis M. Rupp, David O. Bess