Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
1991-10-07
1992-12-15
Cuchlinski, Jr., William A.
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
33474, 33429, 33476, B43L 1300
Patent
active
051705680
ABSTRACT:
A roofing speed square of right-triangular shape and methods to use same wherein rafter base cut marks may be made in one step and rafter common cut marks may be made more easily, accurately and safely than marks made employing currently available devices are disclosed. The speed square has a measurement edge, a base edge and a hypotenuse edge. The base edge is T-shaped in cross section. The measurement edge has indicia in units of roof unit rise. When the speed square corner opposite said measurement edge is superimposed on the top corner of the rafter to be marked, and the measurement edge indicia value corresponding to the unit rise of the roof upon which the rafter is to be installed is aligned with the top edge of said rafter, then the speed square hypotenuse may be used as a ruling edge whereby the base cut mark may be drawn. When the speed square corner opposite said measurement edge is superimposed on the top edge of the rafter to be marked, and the measurement edge indicia value corresponding to the unit rise of the roof on which the rafter is installed is aligned with the top edge of said rafter, then the speed square measurement edge may be used as a ruling edge whereby the common cut marks may be drawn.
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Cuchlinski Jr. William A.
Fulton C. W.
Rooy Paul S.
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