Pipefitter's protractor

Details Pipefitter's protractor Pipefitter's protractor

1983-04-16

1985-02-05

Haroian, Harry N.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33174N, 33427, B43L 706

Patent

active

044971192

ABSTRACT:
A pipefitter's protractor has a pair of body members each of which is capable of supporting a welder's square. The body members are relatively rotatable about an axis so as to enable the squares to occupy any selected position of angular adjustment. The squares are supported on opposite sides of their respective body members to prevent interference between the squares during rotation of the body members.

REFERENCES:
patent: 1269324 (1918-06-01), Shaver
patent: 1828930 (1931-10-01), Grozi
patent: 2194085 (1940-03-01), Hastings
patent: 3245201 (1966-04-01), Richardson
patent: 3331134 (1967-07-01), Jackson et al.
patent: 3670418 (1972-06-01), Hamilton
patent: 4388765 (1983-06-01), Dearman

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