Drafting machine

Details Drafting machine Drafting machine

1973-09-24

1976-01-06

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

33 26X, B43L 1302

Patent

active

039303144

ABSTRACT:
A drafting machine in which parallel support rails moveably support a rule or straight edge extending perpendicularly therebetween so the rule is moveable in parallelism with itself. The rule has a replaceable graduated working edge and carries an endless band which is parallel to the working edge and which has groups of graduations distributed therealong which can be brought into selective registration with the graduations on the working edge. The graduations on the endless band form reducing scales. The rule is profiled and slidably receivable in the profiled rail is an auxiliary instrument which may, conveniently, have a part pivotally mounted thereon for movement in a plane parallel to the work area over which the rule is moveable. The auxiliary instrument is also tiltable away from the working area to expose the working edge of the rule.

REFERENCES:
patent: 1436673 (1922-11-01), Nunamaker
patent: 2089757 (1937-08-01), Nieuwkamp
patent: 2713723 (1955-07-01), Anderson
patent: 2909843 (1959-10-01), Bechtel

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