Parallel rule

Details Parallel rule Parallel rule

1991-12-13

1992-10-06

Will, Thomas B.

Geometrical instruments

Straightedge type

Base attached

33449, 33454, B43L 704, B43L 1302

Patent

active

051520699

ABSTRACT:
A parallel rule which includes a gripper body cover and a rule body, with a gripper body base positioned between them. A plurality of float-contact rollers are installed through respective openings in the rule body and gripper body base. The parallel rule is movable across the paper with only the float-contact rollers contacting the paper, thus minimizing any smearing of drawing ink and the leaving of traces upon the drawing paper. The gripper body cover and an associated end body covers are easily attached and removed from the gripper body base, thus allowing for ease of maintenance.

REFERENCES:
patent: 35812 (1862-07-01), Dow
patent: 2234467 (1941-03-01), DeLisle
patent: 2595842 (1952-05-01), Goerz
patent: 3216115 (1965-11-01), Simerl
patent: 3225445 (1965-12-01), Duggan
patent: 3251131 (1966-05-01), Justis
patent: 3283410 (1966-11-01), Truhon
patent: 3333342 (1967-08-01), Meneely
patent: 3455029 (1969-07-01), Brandys
patent: 4078312 (1978-03-01), Byers
patent: 4339881 (1982-07-01), Kapp
patent: 4445280 (1984-05-01), Hayes
patent: 4688334 (1987-08-01), Tsou
patent: 4914824 (1990-04-01), Lee

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