Geometrical instruments – Straightedge type – Base attached
Patent
1981-03-05
1983-05-17
Little, Willis
Geometrical instruments
Straightedge type
Base attached
33449, 33430, 33DIG1, B43L 1302
Patent
active
043833756
ABSTRACT:
A drafting apparatus for use with a drawing board having a side edge portion and a planar drawing surface in which a guide track extends in spaced relation to the side edge of the board and is mounted from the board for adjustment into several different positions in relation to the board. A T-square having a head body member provided with wheels for rolling engagement with the guide track and carrying a strip of material serving as an armature for coaction with a pair of spaced magnets carried by the head member of the T-square. The magnets are carried on a bar member provided with pivotal movement about a longitudinal horizontal pivot axis parallel to the side edge of the board, the magnet carrying bar member having an actuator portion for releasing the magnets from the armature strip. A slidable lock element is carried by the actuator portion to lock the magnet carrying bar member in release position if desired. A T-square head portion having supporting wheels mounted for adjustment relative to the head body portion to accommodate the T-square blade to different thicknesses of graphic media used on the drawing board. A drawing board provided with a support frame providing angular adjustment of the board.
REFERENCES:
patent: 475350 (1892-05-01), Shiley
patent: 694389 (1902-03-01), Klitsche
patent: 1639580 (1927-08-01), Thompson
patent: 2501296 (1950-03-01), Tyler
patent: 2568575 (1951-09-01), Wickman
patent: 3137072 (1964-06-01), Terry
patent: 3537183 (1970-11-01), Anderson
patent: 4138176 (1979-02-01), Cowdroy
Advertisement Publication Entitled "Mockel Magnetic T. Square with Automatic Brake".
Avella Frank S.
Matthews Charles
Little Willis
Plan Hold Corporation
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