Geometrical instruments – Scriber – Curved line
Patent
1993-07-26
1995-02-21
Will, Thomas B.
Geometrical instruments
Scriber
Curved line
33565, B43L 904
Patent
active
053904184
ABSTRACT:
A tool for drawing circumferences includes a main plate having at least one through opening and at least one disc plate located within the through opening of the main plate. Both plates are contained in a common plane. The disc plate is rotatable around an axis normal to the common plane, the axis passing by a geometrical center of the disc plate. The disc plate has a plurality of through orifices located at different distances from the geometrical center of the disc plate, each orifice forming a pass for a drawing device. The through opening of the main plate defines an inner edge of the main plate, the inner edge having a locking device for interengaging a peripheral groove formed in an outer peripheral edge of the disc plate. The locking device includes at least one radially resilient tongue formed in the plate by at least one cut transversely extending to the inner edge of the main plate so that the tongue elastically yields along a substantially radial direction.
REFERENCES:
patent: 1154673 (1915-09-01), Van Ness
patent: 2631376 (1953-03-01), Callahan
patent: 3460261 (1969-08-01), Frey
patent: 3465445 (1969-09-01), Fisher
patent: 3900956 (1975-08-01), Furuoka et al.
patent: 4251920 (1981-02-01), Cassaones
patent: 4530156 (1985-07-01), Kettlestrings
patent: 4594792 (1986-06-01), Cramb
Buono Patricio A.
Buono Ramiro A.
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