Drafting device for producing concentric lines

Details Drafting device for producing concentric lines Drafting device for producing concentric lines

1979-07-23

1981-06-30

Phillips, Charles E.

Geometrical instruments

Scriber

Curved line

B43L 1106

Patent

active

042755026

ABSTRACT:
An improved drafting device for use in association with drafting templates and forms, both the internal and external shapes, configurations and designs thereof; a circular disc having a rim adapted to underlie the internal or external edge of a template, an optional central underside base to minimize pencil and ink interference from movement of the base, openings or slots to permit pencil, pen or blade insertion through the disc so as to mark or cut spaced sets of lines or cuts in the work sheet under the template, an upper central wall on the disc to ride against the template form and an optional outboard flange on the central wall to override and engage the template top face to control disc undersurface contact with the work; improved devices for drawing concentric lines with respect to template inner and outer forms, including both large and small templates.

REFERENCES:
patent: 1383759 (1921-07-01), Romie
patent: 2561585 (1951-07-01), McKillop
patent: 2782506 (1957-02-01), Ingram
patent: 3230624 (1966-01-01), Fisher
patent: 3465445 (1969-09-01), Fisher

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