Geometrical instruments – Scriber – Curved line
Patent
1990-11-21
1991-10-15
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
B43L 1104
Patent
active
050562304
ABSTRACT:
An ellipsograph structure has first and second arms coupled by pin connections to each other and to a rotatable driving member slidably mounted on a member extending between end supports along a longitudinal axis. A straight line motion mechanism is mounted to one of the end supports for constraining movement of the pin connection between the first and second arms on a straight line along a transverse axis. The straight line motion mechanism includes a pivot member mounted at a fixed pivot point along the longitudinal axis, an extension member in alignment with the longitudinal axis, a swing arm pivotally coupled to the end of the extension member, and a longer guiding arm with one end pivotally coupled to the end of the swing arm and its opposite end pivotally coupled to the pin connection between the first and second arms. The pivot member has a retaining channel in which the guiding arm is slidably retained for sliding movement at all times intersecting the pivot point in conjunction with rotation of the driving member and movement of the pin connection of the arms along the transverse axis.
REFERENCES:
patent: 000312 (1987-02-01), Burstow
patent: 655538 (1900-08-01), Worth
patent: 717082 (1902-12-01), Dart
patent: 880228 (1908-02-01), Looyer
patent: 957114 (1910-05-01), Shea
patent: 2156417 (1939-05-01), Witherspoon
patent: 3237309 (1966-03-01), Vogel
patent: 4182043 (1980-01-01), Nemoto
Chong Leighton K.
Haroian Harry N.
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