Drafting instrument

Details Drafting instrument Drafting instrument

1981-08-21

1983-09-13

Haroian, Harry N.

Geometrical instruments

Straightedge type

Base attached

33474, 33482, B43L 1314

Patent

active

044034237

ABSTRACT:
A drafting instrument is provided for making pictorial drawings, especially axonometric projections. The instrument is in the form of a template which is placed over the drafting surface and may be attached to a drafting machine, straight edge, T-square, or the like. The template is formed with a straight lower edge, perpendicular side edges and a pair of upper edges defining an angle corresponding to the angle of the view to be drawn, i.e. dimetric, trimetric, isometric. The template includes a vertical centerline at the junction of the two upper edges. The margins along each angled upper edge is marked with graduated markings corresponding to the particular angle of the template and parallel to the adjacent angled upper edge. The template also includes a rectangular window or slot extending parallel to the lower edge and provided with graduated markings formed along the edges thereof for use in preparing the views.

REFERENCES:
patent: D137749 (1944-04-01), Murphy
patent: 1142368 (1915-06-01), Row
patent: 1723517 (1929-08-01), McFadden
patent: 2713205 (1955-07-01), Nielsen
patent: 3279074 (1966-10-01), McQuaid
patent: 3604118 (1971-09-01), Miller
patent: 3672062 (1972-06-01), Baker
patent: 4166322 (1979-09-01), Hirano

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