Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1983-04-11
1985-07-02
Frankfort, Charles
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
B43L 706
Patent
active
045259330
ABSTRACT:
An adjustable T-square comprising an elongated blade with measuring indicia on its top surface and an elongated cross member having angular measurement indicia on its top surface. The blade and cross member are coupled together to provide precise relative perpendicular positioning, relative movement of the cross member along the longitudinal axis of the blade while maintaining the perpendicular relationship, and relative angular adjustment. The perpendicular orientation between the cross member and blade is provided by a notch within the top surface of the cross member which receives the blade. A threaded member and knob are employed for attaching the cross member and blade to permit relative positioning angularly and linearly while coupled, and to secure the blade and cross member in a desired position.
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Frankfort Charles
Scanlon Patrick R.
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