Compass able to draw any-size ellipses

Details Compass able to draw any-size ellipses Compass able to draw any-size ellipses

1995-09-11

1996-08-20

Will, Thomas B.

Geometrical instruments

Scriber

Curved line

33 301, B43L 11055

Patent

active

055466648

ABSTRACT:
A compass able to draw any-size ellipses consists of a body, a first and a second position ring, a movable rod, a pen rod, a position rod and a coil spring. The first and the second position ring are screwed on an upper and a lower portion of the body respectively. The movable rod is fitted in a lengthwise center hole of the body. The pen rod is combined on a lengthwise opening of the movable rod. The position rod is fitted in a tubular chamber of the movable rod, with the coil spring fitted around the position rod. The movable rod can move up and down to rotate the pen rod, and the pen rod can be turned around the body for one round by pushing down and up of the movable rod to draw any-size ellipses.

REFERENCES:
patent: 324395 (1885-08-01), Marichaz
patent: 988188 (1911-03-01), Graham
patent: 1168546 (1916-01-01), Odin
patent: 1872973 (1932-08-01), Kittel
patent: 2493229 (1950-01-01), Dibrell et al.
patent: 2690013 (1954-09-01), MacGuire
patent: 3016611 (1962-01-01), Arthur
patent: 3104466 (1963-09-01), King
patent: 4010546 (1977-03-01), Ching-Tien
patent: 4150487 (1979-04-01), Grundman
patent: 4170824 (1979-10-01), Mikulin

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