Power tool used for fastening screw or bolt

Details Power tool used for fastening screw or bolt Power tool used for fastening screw or bolt

2005-12-27

2005-12-27

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

C173S176000, C173S181000, C173S183000

Reexamination Certificate

active

06978846

ABSTRACT:
In a power impact tool for fastening a screw or a bolt, malfunction that driving of a motor is stopped before the screw or the bolt is fastened completely can be prevented. A fastening judger judged that the fastening operation is completed at least when a torque variation ratio becomes substantially zero and a reference index becomes equal to or larger than a threshold value of trouble judgment. The reference index is a number of impact of a hammer in a term in which the torque variation ratios take positive values, and the threshold value of trouble judgment is calculated with using a maximum value of the torque variation ratio in the term. Since the number of the impact of the hammer due to trouble in fastening operation is smaller than that due to the screw or the bolt is fastened completely, it is possible to distinguish the increase of the torque in the former case from the increase of the torque in the latter case.

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An English language Abstract of Japanese Laid-Open Patent Publication No. 2002-283248.
English Language Abstract of JP4-322974.
English Language Abstract of JP 9-285974.
English Language Abstract of JP 6-91551.
English Language Abstract of JP 2002-283248.

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