Patent ID: 7073240
Filing Date: 2006-07-11
Classification: B43L,G01B,Y10T

Abstract:
1. A layout tool useful for fabricating mitered elbow fittings in rectangular air duct comprising: a main body structure having a periphery bounded by a base edge, a 22.5-degree straight edge, and a 11.25-degree straight edge, the main body structure having a substantially planar surface; a portion of the main body structure including an interior opening that includes a 90-degree straight edge, said 90-degree straight edge being perpendicular to the base edge; at least one base flange coupled to the base edge of the main body structure, said base flange oriented substantially perpendicular to the main body structure planar surface; a first corner formed by the junction of the base edge and the 22.5-degree straight edge, said first corner having an included angle of 67.50 degrees; and a second corner formed by the junction of the base edge and the 11.25-degree straight edge, said second corner having an included angle of 78.75 degrees.