Power impact tool

Details Power impact tool Power impact tool

2005-09-20

2005-09-20

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

C173S002000, C173S176000, C173S181000

Reexamination Certificate

active

06945337

ABSTRACT:
In a power impact tool for fastening a fastening member, a torque for fastening the fastening member can be estimated without using a high-resolution sensor and a high-speed processor. The power impact tool comprises a rotation speed sensor for sensing a rotation speed of a driving shaft of a motor with using a rotation angle of the driving shaft, a rotation angle sensor for sensing a rotation angle of an output shaft to which a bit is fitted in a term between an impact of a hammer to next impact of the hammer, a torque estimator for calculating an impact energy with using an average rotation speed of the driving shaft and for calculating a value of estimated torque for fastening the fastening member which is given as a division of the impact energy by the rotation angle of the output shaft, a torque setter for setting a reference value of torque to be compared, and a controller for stopping the driving of the motor when the value of the estimated torque becomes equal to or larger than a predetermined reference value set by the torque setter.

REFERENCES:
patent: 4316512 (1982-02-01), Kibblewhite et al.
patent: 5285857 (1994-02-01), Shimada
patent: 5402688 (1995-04-01), Okada et al.
patent: 5457866 (1995-10-01), Noda
patent: 5544534 (1996-08-01), Fujitaka
patent: 6161629 (2000-12-01), Hohmann et al.
patent: 6371218 (2002-04-01), Amano et al.
patent: 6761229 (2004-07-01), Cripe 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 6-91551.
English Language Abstract of 4-322974.
English Language Abstract of 9-285974.
English Language Abstract of 2000-354976.
English Language Abstract of 2001-277143.
U.S. Appl. No. 10/962,621, Kawai et al.
U.S. Appl. No. 10/924,979, Kawai et al.

Affiliated with

Also associated with

Rating

Power impact tool does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power impact tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power impact tool will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3382050