Geometrical instruments – Scriber – Curved line
Patent
1988-01-29
1989-05-02
Martin, Jr., William D.
Geometrical instruments
Scriber
Curved line
33 181, B43L 1100
Patent
active
048255564
ABSTRACT:
This amusement device is for use with paper and one or more pens, to draw compound plural-lobe designs. It has a base and a paper carriage mounted to the base for, ideally, rotation through a complete design-drawing motion. A pen-holding arm preferably has a motion-imparting fitting at one end, and a longitudinal slot partway between the ends. A pivot pin, movable on the base, engages the slot to provide a fixed arm-pivot axis. The pen holder performs repetitive excursions which each define a single element or lobe of a design, with a fixed ratio between number of excursions and number of complete design-drawing motions. To provide this coordination the motional fitting on the arm is linked mechanically to the carriage--in such a way (preferably using toothed gears) as to be manually offset-table in fixed increments, for redrawing a design offset by fixed steps along the carriage operating direction to make a compound design. Design-element lobes are moved radially by use of various pen positions on the arm; sized by shifting an eccentric drive pin radially on a drive gear, and by shifting the pivot pin relative to the carriage/drive-gear line of centers; skewed by offsetting the pivot pin from the line of centers; arbitrarily deformed by a cam on the drive gear; and varied in number by change of drive gears.
REFERENCES:
patent: 1763885 (1930-06-01), Fisher
patent: 2579290 (1951-12-01), Bachmann
patent: 3256606 (1966-06-01), Horta
patent: 3468032 (1969-09-01), Smith
patent: 4441256 (1984-04-01), Cummings et al.
patent: 4662073 (1987-05-01), Prusman
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