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US 5,077,904 AGranted
Drafting apparatus
OwnerJames K. Michaelinventor
Life of this patent
Estimating the term…
Abstract
A drafting apparatus comprising a drawing board having at least two opposite, parallel sides, and arcuate guide means, detachably coupled to the at least two opposite, parallel sides, for guiding a straight edge along a radial path during formation of radiating perspective lines.
Claims7
A drafting apparatus comprising:
- a straight edge;
- a drawing board having two opposite, parallel side edges, a top edge and a bottom edge;
- a plurality of arcuate guide boards, each having a flat surface, a concave arcuate guide surface of predetermined radius of curvature, the concave arcuate guide surface of each guide board being capable of guiding the straight edge along a radial path during formation of radiating perspective lines, and each concave arcuate guide surface having an apex point corresponding to a horizon line;
- and
- track means, provided on at least the two opposite parallel side edges of the drawing board, for detachably coupling any one of the guide boards to one of the two opposite parallel side edges of the drawing board with the horizon line of each coupled concave arcuate guide board at a various positions along the coupled opposite side edge.
2 more elements
Dependencies are inferred from the claim text.