Telescopic straight edge

Details Telescopic straight edge Telescopic straight edge

1978-05-19

1980-05-20

Stearns, Richard R.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33161, 33DIG1, G01B 306, G01B 308

Patent

active

042032270

ABSTRACT:
A straight edge for use in construction formed of a plurality of members joined by hinges to an end member fitted with a slidable section mounted by a dovetail groove and tongue. The butt sections of each member are fitted with a magnet at each hinge joint so as to latch the unfolded members together in the extended position.

REFERENCES:
patent: 1120443 (1914-12-01), Buck
patent: 1391621 (1921-09-01), Fenwirth
patent: 2642667 (1953-06-01), Smiley
patent: 2669026 (1954-02-01), Doerr
patent: 3792511 (1974-02-01), Evans

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