Patent ID: 7004222
Filing Date: 2006-02-28
Classification: B22C,B22F,B29C,B33Y

Abstract:
1. A device for pattern building in layers, comprising a frame defining a workspace within the frame; a workpiece platform for defining a building area, and being positioned within the frame and being height adjustable during pattern building for building a metal casting mold in layers; a storage bin situated in a workspace above the workpiece platform and serving as a source of a feed material including a moulding sand; a material feeder for delivering the feed material including the moulding sand from the storage bin to the workpiece platform; a feed material spreader including means for balancing out sag of the spreader along its length; and a dispenser for fluidly spraying a liquid agent to the moulding sand, which is delivered to the workpiece platform, for chemically hardening a resin and moulding sand admixture, wherein the building area is essentially rectangular, and has a pair of longer edges and a pair of shorter edges when viewed from the top, and the spreader is arranged to translate along at least one of the shorter edges of the rectangular cross-section of the workpiece platform.