Collapsable framing square

Details Collapsable framing square Collapsable framing square

1988-10-19

1990-05-01

Cuchlinski, Jr., William A.

Geometrical instruments

Straightedge type

Pivot joints

33465, B43L 706

Patent

active

049206583

ABSTRACT:
A collapsable framing square is comprised of first and second flat rigid arms, a pivot pin permanently attached to one side of the first arm, a pivot plate permanently attached to the second arm defining a hole with a diameter equal to that of the diameter of the pivot pin such that the pivot plate fits over the pivot pin, a spring situated over the pivot pin to engagingly bias the pivot plate against the first arm and a washer and C-clip for securing the spring onto the pivot pin. A washer situated between the spring and the pivot plate includes a projection extending downwardly from the side of the washer facing the pivot plate while the pivot plate includes a plurality of chamfered holes situated about the hole defined by the pivot plate to receive the downward projection.

REFERENCES:
patent: 784674 (1905-03-01), Haag
patent: 840628 (1907-01-01), Johnson
patent: 1995658 (1935-03-01), Thompson
patent: 2155352 (1939-04-01), Yarter
patent: 2316189 (1943-04-01), Schaefer
patent: 2735185 (1956-02-01), Naphtal
patent: 2775037 (1956-12-01), Baumunk
patent: 4223445 (1980-09-01), Goodland
patent: 4327501 (1982-04-01), Hurt
patent: 4348815 (1982-09-01), Hurt
patent: 4562649 (1986-01-01), Ciavarella
patent: 4720905 (1988-01-01), Bibeault
patent: 4736524 (1988-04-01), King

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