Perspective drafting instrument
OwnerRonald T. Horbinskiinventor
Life of this patent
Estimating the term…
Abstract
A drafting instrument (14) is provided for drawing perspective lines without physically preestablishing and marking a vanishing point. A carriage (16) and drawing blade (18) are supported on roller means (20) for movement along a drawing surface. Control means (24) adjustably pivots the roller means such that each point along the drawing blade scribes an arc about a common point as the carriage moves. The drawing blade defines substantially parallel lines in perspective radiating substantially from the common point as a vanishing point as the carriage moves.
Claims12
A drafting instrument for drawing perspective lines without physically pre-establishing and marking a vanishing point comprising:
- a carriage;
- a drawing blade on said carriage providing an edge for drawing said lines;
- roller means pivotally mounted to said carriage and supporting said carriage for movement along a drawing surface;
- and
- control means for adjustably pivoting said roller means such that each point along said drawing blade scribes an arc about a common point as said carriage moves, said drawing blade defining substantially parallel lines in perspective radiating substantially from said common point as a vanishing point as said carriage moves;
- wherein said roller means comprises axle means pivotably mounted to said carriage and having wheel means rotatably secured thereto, said axle means and said wheel means having different pivot axes, and wherein said control means comprises means for adjustably setting the degree of pivoting of said axle means to selectively set the radius of said arc and the distance of said vanishing point.
A drafting instrument for drawing perspective lines without physically pre-establishing and marking a vanishing point comprising:
- a carriage;
- a drawing blade on said carriage providing an edge for drawing said lines;
- a first axle pivotally mounted on said carriage between the distal ends of said first axle and having wheels rotatably mounted at said distal ends;
- a second axle pivotally mounted on said carriage between the distal ends of said second axle and having wheels rotatably mounted at said last mentioned distal ends;
- and
- actuator means movably mounted to said carriage and having a first condition oppositely pivoting said first and second axles at their right ends towards each other, and having a second condition oppositely pivoting said first and second axles at their left ends towards each other.
Dependencies are inferred from the claim text.