Vari-scale

Details Vari-scale Vari-scale

1985-11-19

1987-11-24

Little, Willis

Geometrical instruments

Straightedge type

Rules

33488, 33494, G01B 302

Patent

active

047079282

ABSTRACT:
This invention relates to a graduated engineer/architect rule having variably selectable scales for measuring distances and establishing linear proportionalities for representation on a technical drawing. The rule comprises an enclosed, continuous fabric sheet bearing a plurality of divided scales of both the engineer and architect type. The sheet is mounted on and carried by idler rollers, guide platens, and a full length drive platen. A specific scale may be selected by rotating a scale adjustment knob to rotate the drive platen and advance the sheet adjacent to a full length viewing window.

REFERENCES:
patent: 418968 (1890-01-01), Benzinger, et al.
patent: 2124550 (1938-07-01), Evans
patent: 2156524 (1939-05-01), Christensen
patent: 2322248 (1943-06-01), Miller
patent: 2353799 (1944-07-01), Ward
patent: 2375150 (1945-05-01), Townsend

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