To measure an extension of a fastner by using a simple apparatus and a simple method which are introduced easily to a manufacturing process of the fastner, and by which it is required to slightly modify a fastner system.
In the fastner system (1), portable detectors (13) such as one or more reactance capacitors (15, 16) or a camera (34) or an image processor such as a laser are used. The fastener system (1) is attached to be detachable so as to be adjacent to the fastner, and it measures a change in a gap or a special shape of a bolt head or related washers (26, 27) caused by a relative movement of a part of the fastner system (1) without coming into contact with a detection part subjected to the considerable relative movement when the fastner is subjected to a strain.
CLARKE RONALD C
CLARKE PHILOMENA
CENEY STANLEY
| JPS57121407U | 1982-07-28 | |||
| JPH04503707A | 1992-07-02 | |||
| JPH0663890B2 | 1994-08-22 | |||
| JPH0174030U | 1989-05-18 | |||
| JPS4951281U | 1974-05-07 | |||
| JPH074484Y2 | 1995-02-01 | |||
| JPH0478315U | 1992-07-08 |