Geometrical instruments – Scriber – Curved line
Patent
1978-06-26
1979-11-20
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
B43L 1104
Patent
active
041745728
ABSTRACT:
A drafting instrument for tracing curves such as ellipses. The instrument includes a base which is movable over a graphics surface. A marking element is carried by a writing arm connected with the base by linkage means which guides the marking element along a predetermined curvilinear path. The linkage means includes a master arm pivotally mounted at one end on the base for sliding movement along the minor axis and pivotally mounted at its other end on the writing arm by an articulated joint which is adjustable along the writing arm to selectively vary the minor axis apex of the curve being drawn. The linkage means also includes a slave arm pivotally mounted between the base and a midportion of the master arm. Another articulated joint is mounted on the base for sliding movement along the minor axis and is adjustably connected with the writing arm for selectively varying the major axis apex of the curve being drawn. A handle and yoke arrangement is provided for normally holding the marking element in a raised stand-by position and causing the marking element to move downwardly into contact with the graphics surface as a force is applied to the handle for operating the instrument.
REFERENCES:
patent: 73290 (1868-01-01), Bowly
patent: 873291 (1907-12-01), Beck
patent: 1017287 (1912-02-01), Gran et al.
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