Geometrical instruments – Straightedge type – Base attached
Patent
1986-05-20
1987-08-25
Little, Willis
Geometrical instruments
Straightedge type
Base attached
33 1K, 33449, B43L 1302
Patent
active
046883347
ABSTRACT:
Perspective drawing apparatus comprises a straightedge assembly having a blade for guiding a tool and at least one flexible member on a tensioned spool, a free end of the flexible member being connected to an anchor device for location at a vanishing point. The assembly is provided with reference points for determining when the blade is aligned with a ray portion of the flexible member intersecting the vanishing point. Preferably at least two of the flexible members are provided for selectively referencing a plurality of vanishing points of the drawing. The apparatus includes an anchor device incorporating an adjustable arm for locating the vanishing point within or without the drawing surface, the arm being selectively located along an edge of the drawing surface by a clamp having a threaded member conveniently located above the drawing surface. The clamp includes a movable spacer member for accommodating variant thickness of the drawing surface.
REFERENCES:
patent: 1343600 (1920-06-01), West
patent: 2488284 (1949-11-01), Froelich
patent: 3225445 (1965-12-01), Duggan
patent: 3258843 (1966-07-01), Nosser
patent: 3389470 (1968-06-01), Johnson
patent: 3718975 (1973-03-01), Ross
patent: 4075762 (1978-02-01), Ohtake
patent: 4339881 (1982-07-01), Kapp
patent: 4453318 (1984-06-01), Hayes
CC&T Product Development Co., Inc.
Little Willis
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