Drawing aid with interchangeable insert

Details Drawing aid with interchangeable insert Drawing aid with interchangeable insert

1983-09-12

1985-03-19

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

434 87, B43L 1302

Patent

active

045050449

ABSTRACT:
A drawing aid having a sandwich-like structure in which the middle layer is an interchangeable pattern insert. The insert is interchangeable with other inserts, each insert having a particular pattern. The interchangeability of the insert enables the drawing of different lines, shapes, letters, etc. using the same template housing. A particularly useful embodiment allows one to draw a line over the insert pattern, producing broken lines without lifting the drawing tool.

REFERENCES:
patent: 1105810 (1914-08-01), McAll
patent: 2303676 (1942-12-01), Bixby
patent: 2444860 (1948-07-01), Summer
patent: 2543714 (1951-02-01), Bednarczuk
patent: 2604702 (1952-07-01), Collins
patent: 2605550 (1952-08-01), Campbell
patent: 2909843 (1959-10-01), Bechtel
patent: 3584385 (1971-06-01), Booth
patent: 3665612 (1972-05-01), Albright
Berol Rapi Design-Catalog, 1979, pp. 1-32.

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