Patent ID: 7331406
Filing Date: 2008-02-19
Classification: B25B

Abstract:
1. A portable fastener-driving tool, comprising: (a) a housing containing an electric motor, said housing having a driving end that has a fastener driving mechanism proximal thereto, for receiving a collated strip of fasteners and moving a fastener of the collated strip of fasteners to a driving position, said motor providing power to said fastener driving mechanism; (b) a user-adjustable torque-limiting control device; and (c) a controller circuit that is configured: wherein said comparison between said determined amount of torque generated by the motor and said determined state of the user-adjustable torque-limiting control device further comprises: (e) calculating a derivative of an electrical current flowing through said motor, versus time; (f) determining if said derivative of the motor electrical current is greater in absolute magnitude than a predetermined False Reading Setting, and: