Bolt hole probe with flexure

Details Bolt hole probe with flexure Bolt hole probe with flexure

1996-09-27

1998-11-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

738665, 324262, G01N 2790

Patent

active

058349375

ABSTRACT:
An eddy current probe shaft with probe and drive mechanism attached for measuring integrity of a bolt hole, particularly useful for aircraft bolt holes, includes a continuous helical coil manufactured integrally into a one-piece steel shaft providing flexure in the shaft enabling axial self-alignment even when the shaft is inserted obliquely into a bolt hole. The intact, integrated helical coil of flexible steel provides a constant length probe, effectively noncompressible and nonelongatable, flexible under external bias and with a spring constant sufficient to reliably return the shaft to a straight-axis rest position upon release of the external bias. An eddy current probe with a test coil in a probe head is attached at the shaft distal end for measuring cracks and similar structural anomalies in the bolt hole. A drive mechanism is attached at the shaft proximal end for rotating the shaft and probe in the bolt hole for a circumferential scan of the bolt hole interior surface.

REFERENCES:
patent: 3676776 (1972-07-01), Bauer et al.
patent: 3831084 (1974-08-01), Scalese et al.
patent: 4413231 (1983-11-01), Amedro et al.
patent: 4629984 (1986-12-01), Scalese
patent: 4633176 (1986-12-01), Reimer
patent: 5174165 (1992-12-01), Pirl
patent: 5279168 (1994-01-01), Timm
patent: 5517124 (1996-05-01), Rhoades et al.

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