Inspection apparatus

Details Inspection apparatus Inspection apparatus

1978-11-13

1980-04-22

Goldberg, Gerald

Measuring and testing

With fluid pressure

Dimension, shape, or size

33DIG2, G01M 302

Patent

active

041988523

ABSTRACT:
Apparatus suitable for inspecting the positional accuracy of a hole or passage in a workpiece comprising workpiece support means and a probe assembly. The probe assembly comprises two parallel tubes; one provided with a thermistor bead maintained at a temperature higher than ambient and the other provided with a nozzle adapted so as to direct a jet of air on to the thermistor bead. The tubes are positioned on each side of a workpiece to be inspected so that as the tubes are traversed across the workpiece, the jet of air is prevented from impinging upon the thermistor bead. However when a hole or passage in the workpiece is spanned by the nozzle and thermistor bead, the air jet will impinge upon the thermistor bead, thereby cooling it and hence providing a signal that a hole or passage has been encountered.

REFERENCES:
patent: 2794444 (1957-06-01), Markey
patent: 2884495 (1959-04-01), Frankel
patent: 3340886 (1967-09-01), Jacobsen
patent: 3405552 (1968-10-01), Luckett

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