Geometrical instruments – Gauge – Straightness – flatness – or alignment
Patent
1984-12-05
1986-04-22
Little, Willis
Geometrical instruments
Gauge
Straightness, flatness, or alignment
33552, 33553, 33572, 33392, G01B 728
Patent
active
045832978
ABSTRACT:
The present invention relates to a sensing apparatus for sensing the displacement of a movable object relative to its ideal vertical path of travel. The apparatus includes two elongate reference wires extending parallel to the ideal vertical path of travel of the object. The apparatus further includes two sensing devices mounted for movement with the object. Each of the sensing devices is normally positioned a predetermined distance from a respective one of the reference wires such that engagement of the reference wire by the sensing device indicates that the object has been displaced about or from its expected predetermined path of travel.
REFERENCES:
patent: 3303571 (1967-02-01), Veals
patent: 3593427 (1971-07-01), Abarotin
patent: 3594909 (1971-07-01), Schultz
patent: 3597849 (1971-08-01), Gaal
patent: 3918167 (1975-11-01), Gerber
patent: 3925636 (1975-12-01), Coleman
patent: 3962693 (1976-06-01), Schamblin
Erickson D. E.
Little Willis
Westinghouse Electric Corp.
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