Method and apparatus of monitoring the screwing home of a thread

Details Method and apparatus of monitoring the screwing home of a thread Method and apparatus of monitoring the screwing home of a thread

1979-06-12

1981-08-18

Larson, Lowell A.

Metal working

Method of mechanical manufacture

With testing or indicating

29240, 73 12, B25B 2314

Patent

active

042838304

ABSTRACT:
In order to determine whether the screwing home of a threaded element, such as a screw, by a power tool has been acceptably executed, the number of revolutions undergone by the threaded element during the screwing operation is measured as a function of time. The revolution-time function derived for the screwing operation is compared with a reference function corresponding to an acceptable screwing operation. The comparison shows up unacceptable screwing operations and can be performed both visually and by a microcomputer. Apparatus for effecting such monitoring of screwing operations includes sensing means for measuring rotation of the output shaft of the power tool and circuit means for processing the output of the sensing means and effecting the comparison with the reference function.

REFERENCES:
patent: 3696871 (1972-10-01), Stenbacka
patent: 4027530 (1977-06-01), Tambini et al.
patent: 4176436 (1979-12-01), McCombs et al.

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