Drawing apparatus

Details Drawing apparatus Drawing apparatus

1974-08-19

1976-01-06

Aegerter, Richard E.

Geometrical instruments

Scriber

Curved line

33 79A, B43L 1302

Patent

active

039303136

ABSTRACT:
Drawing apparatus adapted for attachment to a drawing board and comprising a carriage supported for travel on the upper edge of the drawing board and carrying a depending rail which extends parallel to the lateral edges of the drawing board. A ruler-carrier head is slidably mounted on the rail. A linkage assembly constituted by two interconnected articulated parallel parallelogram linkages is connected by means of the short arm of one of the linkages to the carriage and by means of the short arm of the other of the linkages to the rear surface of the drawing board.

REFERENCES:
patent: 747522 (1903-12-01), Wilkes
patent: 1441939 (1923-01-01), Muller
patent: 1482606 (1924-02-01), Goldrick
patent: 3074173 (1963-01-01), Little
patent: 3120060 (1964-02-01), Graham
patent: 3343267 (1967-09-01), Wolf

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