Geometrical instruments – Straightedge type – With means for moving straightedge over a surface
Patent
1991-05-07
1992-12-29
Haroian, Harry N.
Geometrical instruments
Straightedge type
With means for moving straightedge over a surface
B43L 704
Patent
active
051740362
ABSTRACT:
An improved multi-functional ruler is disclosed comprising a body of a ruler including an axial seat and an axial rod having convex blocks at each of its two ends attached with rollers. The convex blocks are separately connected to the interior of axial nuts. The axial nuts and the axial seats are tightly fixed together, with an axial block located at a central part of the internal lateral side of the body of the ruler. When the axial rod of the forementioned structure is set in motion, it will not cause a tremendous area of friction with the body of the ruler. It will slide smoothly without causing any position shifting of the axial rod so as to enable lines to be accurately drawn. The axial block can function as a center from which circles of different diameters can be drawn.
REFERENCES:
patent: 1511378 (1924-10-01), Strom
patent: 3195235 (1965-07-01), Regan
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