Ruler with safety shield

Details Ruler with safety shield Ruler with safety shield

2011-04-12

2011-04-12

Guadalupe-McCall, Yaritza (Department: 2841)

Geometrical instruments

Straightedge type

Plural nonadjustable straightedges forming nonright angles

C033S492000

Reexamination Certificate

active

07921574

ABSTRACT:
A tool for aiding marking or cutting is described. A V-shaped member having an edge formed at an exterior apex of the V for guiding a marker or cutting tool. The exterior surfaces of the V-shaped member may have a material applied having a higher coefficient of friction than that of the V-shaped member. The edge at the apex of the V may have two substantially planar surfaces, each of which forms a complimentary angle with the interior apex angle of the V, or a thin metal portion formed in the exterior apex of the V so that an edge thereof protrudes sloping towards a surface on which the tool is laid. A graduated scale may be applied to an exterior surface of the tool at a location near the apex.

REFERENCES:
patent: 287480 (1883-10-01), Smith
patent: 781117 (1905-01-01), Willitts
patent: 963001 (1910-06-01), Dibrell
patent: 2634504 (1953-04-01), Jennings, Jr.
patent: 3406456 (1968-10-01), Schleich
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patent: 5873171 (1999-02-01), Hsu
patent: 5960554 (1999-10-01), Kamykowski
patent: 6349479 (2002-02-01), Bottega
patent: 6782629 (2004-08-01), Jimenez et al.

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