Protected pivot adjustable scaled compasses

Details Protected pivot adjustable scaled compasses Protected pivot adjustable scaled compasses

1979-07-12

1981-05-19

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

B43L 904

Patent

active

042676380

ABSTRACT:
A protected pivot adjustable scaled compasses including a slotted body marked with multiple scales. A spring loaded transparent push button with pivot point retractable within the body support. A transparent movable slide arrangement with locking mechanism supported by and positioned over the scaled body. The slide configured with multiple sized holes intersecting alignment marks for use in conjunction with the scales to accurately set and circumscribe arcs or circles using a variety of readily available marking instruments. A washer used in conjunction with the slide locking screw to raise the slide and body during ink application and lower the slide and body when a pencil or scribe is used.

REFERENCES:
patent: 776897 (1904-12-01), Ferris
patent: 1447207 (1923-03-01), Golden
patent: 1498870 (1924-06-01), Fox
patent: 2063776 (1936-12-01), Wozny
patent: 2542537 (1951-02-01), Klemm
patent: 3292262 (1966-12-01), Moll
patent: 3315361 (1967-04-01), Mutter
patent: 3474538 (1969-10-01), Kirkegaard
patent: 3513548 (1970-05-01), Itano

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