Rail type universal parallel ruler device

Details Rail type universal parallel ruler device Rail type universal parallel ruler device

1979-12-19

1982-01-26

Haroian, Harry N.

Geometrical instruments

Straightedge type

Base attached

B43L 1302

Patent

active

043121322

ABSTRACT:
A rail type universal parallel ruler device wherein a balance weight is provided which is connected to the head by means of a cord or the like and shifts along a vertical rail in a direction opposite to the shifting of the head. A fixed magnet is disposed along almost the entire length of the path of travel of the balance weight, and a magnet is provided on the balance weight opposed to the fixed magnet, and the balance weight is repulsed so as to be suspended as it moves along the path of travel by the magnetic force between the magnets.

REFERENCES:
patent: 3390462 (1968-07-01), Faul et al.
patent: 3441331 (1969-04-01), Kesling
patent: 3673691 (1972-07-01), Gilbert
patent: 3771797 (1973-11-01), Braun
patent: 4070758 (1978-01-01), Watanabe

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