Black board line marking device

Details Black board line marking device Black board line marking device

1978-05-15

1979-11-20

Haroian, Harry N.

Geometrical instruments

Scriber

Straight-line

33 41R, B43L 1300

Patent

active

041745736

ABSTRACT:
A desired marker such as a felt tip pen or a pencil or a chalk may be carried across a chalk board by mounting the marker on a clamp which is attached to an arm. The arm in turn can be mounted on a trolley which is movable on a frame. The frame can be attached to the chalk tray by wheels and a handle attached to the frame. The marker can be moved across the chalk board by moving the arm mounted on the trolley with respect to the general position of the frame. The frame can be moved using the wheels underneath the frame and the handle attached to the frame.

REFERENCES:
patent: 561585 (1896-06-01), Harris
patent: 668957 (1901-02-01), Fletcher
patent: 972569 (1910-10-01), Nunamaker
patent: 1013086 (1911-12-01), Winters
patent: 1186716 (1916-06-01), Walker
patent: 2861343 (1958-11-01), Click
patent: 3086290 (1963-04-01), Kuehl
patent: 3363319 (1968-01-01), Greer
patent: 3378927 (1968-04-01), Lowery
patent: 4008522 (1977-02-01), Anderson

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