Arrangement in angle rulers for improving fixture of an angularl

Details Arrangement in angle rulers for improving fixture of an angularl Arrangement in angle rulers for improving fixture of an angularl

1982-08-20

1984-05-08

Haroian, Harry N.

Geometrical instruments

Straightedge type

Pivot joints

33418, B43L 706

Patent

active

044466277

ABSTRACT:
In an arrangement in angle rulers for improving the fixture of an angularly adjustable blade (10) of said rulers to the stock (11) thereof in selected angular positions relative thereto, the stock (11) comprises a rectangular hollow section having a lateral opening (17), the blade (10) being arranged to be partly surrounded by the hollow profile of the stock. A spring-loaded (20), displaceable peg (19) is arranged to extend through at least one (12) of the mutually opposing walls (12,13) of the stock, and through the blade (10). One surface of the blade exhibits grooves or promontories (27) arranged to co-act with corresponding grooves or promontories (26) in the inwardly facing surface of the wall (12), whereat both grooves (27) and promontories (26) concentrically encircle the peg (19), around which peg the blade (10) is arranged to pivot.

REFERENCES:
patent: 1638200 (1927-08-01), Hester
patent: 2775037 (1956-12-01), Baumunk
patent: 2920392 (1960-01-01), Stromquist

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