Track type drafting machine

Details Track type drafting machine Track type drafting machine

1975-02-12

1976-04-20

Aegerter, Richard E.

Geometrical instruments

Scriber

Curved line

33 1M, B43L 1302

Patent

active

039508536

ABSTRACT:
An accessory for a track type drafting machine mounted for motion over the surface of a drawing board. The drafting machine accessory includes a set of endless graduated tapes running between rollers mounted at the ends of horizontal and vertical tracks. A set of indicators move along the tapes. One of the indicators is mounted on the drafting machine head carriage and moves along the length of the vertical track, so as to move along the vertical tape. The other indicator is mounted on the vertical track carriage and is moveable along the horizontal tape. A set of right-angled, common origin scales is fitted to the drafting machine head. The graduated tapes are each provided with a zero point from which positive numbers progress in one direction and negative numbers progress in the other. Means are provided for rotating each tape about its respective rollers to adjust the position thereof. Finally, means are provided to lock the tapes in their adjusted positions.

REFERENCES:
patent: 534865 (1895-02-01), Dolen
patent: 2618860 (1952-11-01), Engelhart
patent: 2621411 (1952-12-01), Christen
patent: 2928178 (1960-03-01), Wilcox
patent: 3345747 (1967-10-01), Sattler

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