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US 4,586,265 AGranted
Perspective drawing apparatus
OwnerWilliam G. Hopkins, Philip L. Reidinventors
Life of this patent
Estimating the term…
Abstract
A drafting apparatus having a linear edge with first and second wheel means associated with the edge to rotatably move the linear edge across a planar drafting surface and wherein the wheels are of differing diameter so as to have the linear edge move across an arc defined within a circle toward which the linear edge is always pointed. The center of that circle is the vanishing point as conventionally utilized with perspective drawing techniques.
Claims2
A drafting apparatus for use in producing a perspective drawing, comprising:
- a rule defining two parallel linear edges and defining in a central portion thereof a slot;
- an axle mounted in said slot;
- first wheel means mounted on said axle;
- second wheel means mounted on said axle;
- and
- wherein said first wheel means is of a greater diameter than said second wheel means whereby when said apparatus is rotably moved across a planar surface, said apparatus moves in an arc about a circle toward which one of said linear edges is always directed.
3 more elements
An apparatus for producing perspective drawings comprising:
- rule means defining a pair of parallel linear edges and defining within the central portion thereof a slot;
- a tapered dowel mounted within said slot in a different plane from said linear edges whereby the surface of said tapered dowel when on a planar surface is substantially parallel to said linear edge along said planar surface.
Dependencies are inferred from the claim text.