Geometrical instruments – Miscellaneous – Light direction
Patent
1996-05-31
1998-07-14
Fulton, Christopher W.
Geometrical instruments
Miscellaneous
Light direction
33 1N, 33707, 33613, G01B 1102, H03M 122
Patent
active
057785422
ABSTRACT:
Apparatus is provided for giving a visual indication of increments of position over a predetermined range of positions to either side of and including a predetermined zero reference point. The apparatus includes a plurality of pattern generating units, each including first and second surfaces, each of these first and second surfaces having a plurality of spaced-apart opaque areas having translucent areas therebetween. The second surface is superimposed upon the first surface for creating a plurality of patterns in response to movement therebetween. The plurality of pattern generating units are arranged adjacent one another and are respectively configured for producing a unique and identifiable set of patterns for each of a plurality of increments over a predetermined range to either side of and including a predetermined zero reference point.
REFERENCES:
patent: 2659072 (1953-11-01), Coales et al.
patent: 3945129 (1976-03-01), Bergkvist
patent: 4288056 (1981-09-01), Bergstrom
patent: 4336659 (1982-06-01), Bergkvist
patent: 4343090 (1982-08-01), Bergkvist
patent: 4739164 (1988-04-01), Burkhardt
patent: 4786891 (1988-11-01), Ueda et al.
patent: 4995169 (1991-02-01), Lunden
patent: 5287630 (1994-02-01), Geisler
Fulton Christopher W.
Illinois Tool Works Inc.
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