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US 3,942,583 AGranted
Lost plastic pattern for casting
OwnerEduard Baurinventor
Life of this patent
Estimating the term…
Abstract
Hollow "lost plastic" patterns for metal casting molds are built up from plastic plate or sheet material bonded to internal supporting framing; the elements being formed of substantially ashless plastic solid or foam rod sheets or laminates easily sculptured or bent to desired shape when heated to provide even large and complex hollow patterns with a comparatively small expenditure of pattern material and labor.
Claims10
A lost plastic pattern for use in producing metal casting molds, comprising:
- internal framework means comprised of a plurality of peripherally continuous open frame sub-assemblies, said sub-assemblies spaced from each other;
- and
- external sheeting applied as sheathing means secured to and supported by said framework means and defining the mold-cavity-determining, pattern-external-surface contour, and constituting with the framework means a composite pattern hollow in the pattern section providing the cast metal filled cavity of the mold to be produced;
- said framework means and sheathing means comprised of respective synthetic plastic material gasifiable or burnable under applied heat, and substantially ashless;
- said sheeting being comprised of a plurality of laminations including an external lamination of solid plastic film applied onto and covering an underlying framing-means-supported lamination of plastic foam.
2 more elements
Dependencies are inferred from the claim text.