Ruled multi-purpose drafting instrument

Details Ruled multi-purpose drafting instrument Ruled multi-purpose drafting instrument

1988-12-27

1991-03-19

Haroian, Harry N.

Geometrical instruments

Straightedge type

Plural straightedges nonadjustably fixed at right angles

33480, B43L 700

Patent

active

049999222

ABSTRACT:
The present invention discloses a multi-purpose drafting instrument adapted to combine the functions of drafting triangles and commonly used drafting scales. The drafting instrument of the invention generally comprises an L-shaped integrally formed substantially planar construction having two legs of equal length and width disposed perpendicular to each other. The end of each leg is inclined at an angle of 45 degrees relative the outer edge of each leg, the upper face of each leg is beveled at its inner edge to provide a thin working edge, and a ruled scale is provided on the lower face of each leg at its inner edge. The drafting instrument also includes a plurality of glide points extending outwardly from the lower face of the instrument to support the instrument slightly above the surface upon which it is used, and a handle disposed near the intersection of the two legs of the instrument to facilitate its use.

REFERENCES:
patent: D136091 (1943-08-01), Tripp
patent: 343616 (1986-06-01), Upson et al.
patent: 1523919 (1925-01-01), Vitek et al.
patent: 2364529 (1944-12-01), Hill

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