Drafting apparatus

Details Drafting apparatus Drafting apparatus

1977-11-11

1980-05-13

Phillips, Charles E.

Geometrical instruments

Straightedge type

Base attached

242 671D, 24 33B, B43L 1302

Patent

active

042021111

ABSTRACT:
A drafting aid comprising a flat board, the board having two straight parallel edges and guide surfaces at the parallel edges. A flexible member passes about the board and over the guide means. The flexible member includes resilient tension members extending between the end edges thereof to form a taut member about the board.

REFERENCES:
patent: 1477409 (1923-12-01), Woolman
patent: 1506489 (1924-08-01), Kiefer
patent: 2622364 (1952-12-01), Hine
patent: 2696415 (1954-12-01), Himelson
patent: 3108028 (1965-04-01), Roccati
patent: 3330580 (1967-07-01), Vanek
patent: 3630588 (1971-12-01), Baker
patent: 3669227 (1972-06-01), Alford
patent: 4200173 (1978-02-01), Closterman

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