Drafting apparatus

Details Drafting apparatus Drafting apparatus

1980-03-31

1982-08-10

Phillips, Charles E.

Geometrical instruments

Straightedge type

Base attached

33 27C, 33158, 33483, B43L 1304, B43L 700, B43L 904

Patent

active

043430945

ABSTRACT:
The present drafting apparatus comprises a rail (6) removably secured along the edge of a drafting board. Normally, the rail (6) serves for guiding a T-square (2, 3) which is, for example, pulled against the rail (6) by a magnetic force. If the rail (6) is released from the brackets (8) it may be used together with the trammel heads (7) as a beam compass. For this purpose one of the trammel heads (7) is equipped with a compass needle tip (19) and the other trammel head is equipped with a compass drafting lead tip holder (16). A scale (21) attached to the rail (6) permits the precise adjustment of the radius. Further, the rail (6) when removed from the brackets (8) may also be used as a straight edge for drawing long, straight lines.

REFERENCES:
patent: 685369 (1901-10-01), Barrie
patent: 1014803 (1912-01-01), Bohn
patent: 3589013 (1971-06-01), Colon
patent: 4051599 (1977-10-01), Sinkovec

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