Geometrical instruments – Straightedge type – Base attached
Patent
1979-02-09
1980-07-22
Phillips, Charles E.
Geometrical instruments
Straightedge type
Base attached
33443, B43L 500, B43L 1304
Patent
active
042132487
ABSTRACT:
A navigational aid to define the direction relative to a reference direction of a line between two designated points on a chart of the kind comprising a base surface for the chart, a rotatable direction indicating member having one or more directional indices and being displaceable relative to the base surface carried by two mutually cooperating support means of which a first one is movable relative to the base surface in one direction along a stationary rectilinear guide means, and the second one is movable in a direction perpendicular thereto along a rectilinear guide means carried by the first support means. In a device according to the invention said first movable support means constitutes a first rectangular transparent frame, carried in guide means located at each one of two opposite edges of the frame by each one guide rail which is stationary relative to the base surface and along which this first frame is movable in said one direction. On each one of its two mutually opposite edges extending perpendicularly to the stationary guide rails, this first frame comprises guide means for slidably carrying the second support means, as well forming a transparent frame, at two opposite and mutually parallel edges thereof having guide means co-operating with the last mentioned guide means of the first frame. The direction indicating member is journalled in the second frame with its axis of rotation substantially half-way between the guide means at said edges of the second frame.
REFERENCES:
patent: 2110087 (1938-03-01), Kuhn
patent: 3345751 (1967-10-01), Banzee et al.
patent: 3393458 (1968-07-01), Freda
patent: 3456352 (1969-07-01), Bowen
Nissen J. Harold
Phillips Charles E.
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