Drawing instrument

Details Drawing instrument Drawing instrument

1993-03-22

1995-02-28

Fulton, Christopher W.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33471, 33496, B43L 710

Patent

active

053925254

ABSTRACT:
A drawing instrument including two rulers each having a head portion, a circular protrusion formed on one of the head portions, and a circular recess formed in the other head portion for slidable engagement with the circular protrusion, the rulers are guided to rotate relative to each other by the slidable engagement between the circular protrusion and the circular recess. The head portions can be easily coupled together without additional tools or without additional coupling devices.

REFERENCES:
patent: 691728 (1902-01-01), Norfolk
patent: 715194 (1902-12-01), Callahan
patent: 840628 (1907-01-01), Johnson
patent: 999725 (1911-08-01), Adams
patent: 1159569 (1915-11-01), Chancellor
patent: 2054420 (1936-09-01), Hochman
patent: 3273246 (1966-09-01), Siberini
patent: 4562649 (1986-01-01), Ciavarella
patent: 5020233 (1991-06-01), Syken

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