Power fastening tool

Details Power fastening tool Power fastening tool

2007-01-02

2007-01-02

Thompson, Jewel (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

Reexamination Certificate

active

10962621

ABSTRACT:
In a power fastening tool for fastening a fastening member such as a screw or a fastening member, malfunction that driving of a motor is stopped before the fastening member is fastened completely can be prevented. A fastening judger judges that the fastening operation is completed when a value of an estimated torque T for fastening the fastening member becomes larger than a predetermined lower limit value T1previously set by a user and a value of a torque variation ratio ΔΔT varies from positive to negative. Thus, it is possible to prevent malfunction for stopping driving of a motor even when the value of the torque variation ratio ΔΔT varies from positive to negative due to trouble before the vale of the estimated torque T becomes larger than the lower limit value T1.

REFERENCES:
patent: 6978846 (2005-12-01), Kawai et al.
patent: 4-322974 (1992-11-01), None
patent: 6-91551 (1994-04-01), None
patent: 9-285974 (1997-11-01), None
patent: 2000-354976 (2000-12-01), None
patent: 2001-277146 (2001-10-01), None
English Language Abstract of JP 4-322974.
English Language Abstract of JP 9-285974.
English Language Abstract of JP 6-91551.
English Language Abstract of JP2001-277146.
English Language Abstract of JP2000-354976.
U.S. Appl. No. 10/962,565.
U.S. Appl. No. 10/924,979.

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