APPARATUS FOR USE IN MAKING PATTERNS FOR ELBOWS FOR CYLINDRICAL PRODUCTS, AND OTHER LAYOUTS

Apparatus for use in making patterns for multi-piece elbows for cylindrical products such as pipes and the like, and for other layouts, comprising a flat elongated base bar marked with designations indicating numbers of pieces which may be embodied in the elbow, a spacing bar marked with designations indicating numbers of spaces into which the pattern stretch-out is to be divided, and also marked with designations indicating diameters, a pattern marking bar provided with holes arranged in rows for coinciding with space indicating lines on the pattern and for marking intersection lines as a guide to drawing the pattern, a pair of short bars, and means connecting bars in certain combinations and angular arrangements for use in dividing the pattern into a selected number of equal spaces, for establishing throat and pitch lines, and for marking intersections as a guide to drawing the pattern. The apparatus is useful for both "parallel line development" and "radial line development," and is not limited to making elbow patterns.