Geometrical instruments – Area integrators – Electrical
Patent
1975-05-02
1977-05-10
Aegerter, Richard E.
Geometrical instruments
Area integrators
Electrical
33174P, 33178F, G01B 512, G01B 520, G01B 712
Patent
active
040219259
ABSTRACT:
Apparatus and process for determining and measuring the internal diameter of or the internal wear, pitting or thinning in a hollow pipeline, or the like, normally underground or underwater, whereby changes in the internal surface configuration or internal diameter of the pipeline at various points along its length are measured. The process includes measuring the changes in the internal configuration of the hollow pipeline, at various points along the length thereof and/or around the circumference thereof at various positions along the longitudinal axis thereof, and converting such measurements of changes in the internal configuration of the hollow pipeline into internal diameters or internal wear, pitting or thinning distance values. The apparatus includes rotatable means which enters and senses the distance of a straight line extending from the longitudinal axis of the apparatus to the internal surface of the pipeline in a predetermined radial direction at a predetermined point along the length of the pipeline. The rotatable sensing means also produces a signal representative of the distance of the line. The rotatable sensing means includes a linear potentiometer, and a rotatable sensing unit which includes a ball bearing mounted, in a universal movement manner, on the end of the shaft of the linear potentiometer. The apparatus also includes means for rotating the rotatable sensing means to the desired radial position, and means for moving the rotatable sensing means longitudinally in the pipeline to the desired point along the length of the pipeline.
REFERENCES:
patent: 2150070 (1939-03-01), Kregecz
patent: 2514355 (1950-07-01), Barnes
patent: 2527170 (1950-10-01), Williams
patent: 3535803 (1970-10-01), Creek et al.
patent: 3641678 (1972-02-01), Murphey, Jr. et al.
patent: 3718978 (1973-03-01), Van Koevering et al.
patent: 3886665 (1975-06-01), Lowen
patent: 3939570 (1976-02-01), Loftus
Aegerter Richard E.
Stearns Richard R.
Troxell Bruce H.
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