Metal working – Method of mechanical manufacture – Shaping mating parts for reassembly in different positions
Reexamination Certificate
2006-07-11
2006-07-11
Omgba, Essama (Department: 3726)
Metal working
Method of mechanical manufacture
Shaping mating parts for reassembly in different positions
C029S890140, C029S557000, C029S558000, C033S474000, C033S476000, C033S482000, C033S494000
Reexamination Certificate
active
07073240
ABSTRACT:
A layout tool and a means for using the tool to fabricate multi-segment elbows and offset joints from rectangular cross-section fibrous air ductboard material. The tool has a triangular main body having at least one structural feature that defines a plane. At least one flange is connected to the main body, is oriented substantially perpendicular to the main body plane, and forms the first side of the triangle. The main body includes a first outer straight edge extending at an angle of 67.50 degrees from the flange forming the second side of the triangle. A second outer straight edge extending at an angle of 78.75 degrees from the flange forms the third side of the triangle. An inner structure of the main body forms a straight edge perpendicular to the plane of the flange. The outer angled and interior straight edges enable 22.5- and 45-degree miter joints to be easily marked and cut in pre-formed fibrous air duct. Markings on the main body indicate required distances between cuts to accomplish desired offset rises.
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Mead Andrew D.
Omgba Essama
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