Geometrical instruments – Straightedge type – Cord type
Patent
1984-08-02
1985-11-12
Martin, Jr., William D.
Geometrical instruments
Straightedge type
Cord type
33339, B44D 338
Patent
active
045519226
ABSTRACT:
A pipe assembly has arm members pivoted to the opposite ends thereof, guide wheels are rotatably mounted on each of the arm members, a spirit level, reels and a handle are mounted on the pipe assembly, an ink pad assembly is mounted on one of the arm members, a line marking string is anchored to the opposite ends to the reels to be payed out of one of the reels and wound about the other reel under tension whereby the string is struck against an object on which a line is to be marked. Angle members are secured to the opposite ends of the pipe assembly and a weighted string is suspended vertically from one of the angle members for marking a line on an object orientated vertically.
REFERENCES:
patent: 2524596 (1950-10-01), Kamp
patent: 2636275 (1953-04-01), Whittington
patent: 2655728 (1953-10-01), Cook
patent: 4202108 (1980-05-01), Adams, Jr. et al.
patent: 4228588 (1980-10-01), Horton, Jr.
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