Geometrical instruments – Straightedge type – Base attached
Patent
1995-08-16
1997-05-27
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Base attached
33434, 33 1K, B43L 1314
Patent
active
056320949
ABSTRACT:
A portable drafting device and learning tool for laying out perspective drawing lines to enhance the realism of standard 30 degree base line isometric drawings and other similar drawings with different base line angles. The device comprises a rectangular drawing board including a plurality of holes disposed linearly in the upper corner portions thereof for pivotally mounting a plurality of articulated arm members in functional relationship with the drawing surface. The articulated arms comprise upper arm portions which are pivotally coupled to straight-edge members, each being disposed at approximately thirty degrees to horizontal. Upper arm portions are provided with a plurality of adjustment holes for alternate placement of pivot pins, or a slot to effect vertical adjustment of the articulated arms in relation to the drawing surface. Straight-edge members may be pivoted at varying angles in relation to upper arm members to enable selective adjustment of the desired vanishing point distance. The drafting apparatus includes a set of perspective scalers which are selectively utilized as measurement guides for adding perspective enhancement to the vertical and horizontal features of the drawings. The invention is of particular benefit to the student draftsperson or artist who does not possess the skill necessary to produce precise perspective drawings.
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