Protractable straight-edge with vise

Details Protractable straight-edge with vise Protractable straight-edge with vise

1979-03-27

1981-01-13

Haroian, Harry N.

Geometrical instruments

Straightedge type

Base attached

B43L 702

Patent

active

042441196

ABSTRACT:
A light weight portable straight-edge which incorporates a complete 180.degree. protractor with a vise for individual position stability. The vise is essentially a common heavy gauge spring establishing a pivot that induces a constant pressure at the extremity of the opposing clamp and straight edge that together have a holding tolerance for materials of 1/4" to approximately 21/4".

REFERENCES:
patent: 802202 (1905-10-01), Dougan
patent: 1600666 (1926-09-01), Dugan
patent: 2936524 (1960-05-01), Shaffer

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