Multi-purpose drawing ruler

Details Multi-purpose drawing ruler Multi-purpose drawing ruler

1992-03-24

1993-03-16

Haroian, Harry N.

Geometrical instruments

Straightedge type

With means for moving straightedge over a surface

33 2703, B43L 1302

Patent

active

051932849

ABSTRACT:
A multi-purpose drawing ruler comprising a ruler body, a direction wheel shaft assembly, two brake assemblies, two reset shafts and two retainers, in which the ruler body is in the form of a straight ruler with markings of length along an edge, a plurality of holes at appropriate positions along the markings for passing through of a drawing pen, a pivot at the right end of the markings and another pivot at the left end of the markings, a rail at the front end for attachment of two retainers, a slot in the middle of the ruler body for installation of the direction wheel shaft assembly, a pair of rail at each end of the slot for installation of a brake assembly, an elliptical hole at each end of the slot and a reset indicator on its top so that after placing of the direction wheel shaft assembly in the slot, each reset shaft is fixed to a screw hole at the direction wheel shaft after passing through the elliptical hole and the hole at the brake assembly is disclosed.

REFERENCES:
patent: 35812 (1962-07-01), Dow et al.
patent: 5050309 (1991-09-01), Wang

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