Rail type universal parallel ruler device

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

1982-08-24

1984-02-14

Haroian, Harry N.

Geometrical instruments

Straightedge type

Base attached

33DIG1, 33 1M, B43L 1302

Patent

active

044308051

ABSTRACT:
A rail type universal parallel ruler device comprising a drawing board, a horizontal rail mounted on the drawing board, a horizontal cursor mounted shiftably on the horizontal rail, a vertical rail connected to the horizontal cursor, a vertical cursor mounted shiftably on the vertical rail, and a head connected to the vertical cursor, the improved rail type universal ruler device wherein a magnetic member is disposed on each of the cursors and rails for guiding the cursors and/or on a tail portion of the vertical rail and the side of drawing board for guiding the tail portion of the vertical rail, and magnetic force is caused to work between the magnetic members in a direction where the cursor is floated relative to the surface of rail and/or a direction where the tail portion of the vertical rail is floated relative to the surface of the drawing board side.

REFERENCES:
Meyers Enzyklopadisches Lexikon, Band 15: Let-Meh, Bibliographisches Institut, 1975.

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