Drafting instrument

Details Drafting instrument Drafting instrument

1991-03-08

1992-06-30

Will, Thomas B.

Geometrical instruments

Scriber

Curved line

33 2701, B43L 904

Patent

active

051251612

ABSTRACT:
A circle drafting instrument (A) comprises a support member (12) rotatably mounting a slotted disk (10). A line forming point (50) is positioned in a slot (B) at a selected distance from a center point (36) of disk (10). Slot B has offset apexes (44a, 46a) incremental radially along disk (10) for precision circle drafting. Additional slots (C, D, E) may also be provided for a larger number of increments. The forming point and the disk are rotated in the support so as to form a circle of a desired size.

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patent: 3460261 (1969-08-01), Frey
patent: 3465445 (1969-09-01), Fisher
patent: 3805390 (1974-04-01), Craig
patent: 4353166 (1982-10-01), Kettlestrings
patent: 4899449 (1990-02-01), Fouladian

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