Method and apparatus for tightening bolts

Data processing: generic control systems or specific application – Specific application – apparatus or process – Mechanical control system

Reexamination Certificate

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Details

C073S862230, C173S176000, C081S467000

Reexamination Certificate

active

06954682

ABSTRACT:
According to a bolt tightening method and a bolt tightening apparatus of the invention, a bolt is tightened by using a bolt tightening device, in which torque gradients expressed in terms of the ratio of a tightening torque exerted on the bolt to its turning angle are calculated by successively detecting the tightening torque at intervals of a specific bolt turning angle and calculating an average of individual torque gradient values by first and second torque gradient calculators, and the amount of tightening of the bolt is controlled by a tightening amount controller based on the average of the individual torque gradient values calculated.

REFERENCES:
patent: 5172616 (1992-12-01), Negishi
patent: 5396703 (1995-03-01), Rice
patent: 5877433 (1999-03-01), Matsuzaki et al.
patent: 6105475 (2000-08-01), Ohmi et al.
patent: 6144891 (2000-11-01), Murakami et al.
patent: 6698298 (2004-03-01), Tsuji et al.
patent: 02-041830 (1990-02-01), None
patent: 02-041830 (1990-02-01), None
patent: 07-256566 (1995-10-01), None
Japanese Office Action issued on Sep. 21, 2004 in the corresponding Japanese Patent Application No. 2002-234044.

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