Patent ID: 8225978
Filing Date: 2012-07-24
Classification: B25C

Abstract:
1. A fastening device that drives one or more fasteners into a workpiece, the fastening device comprising: a tool housing; a multistage solenoid contained in said tool housing, said multistage solenoid includes an armature member that travels through at least a first stage, a second stage and a sense coil, said sense coil is disposed between said first stage and said second stage; a driver blade assembly including a driver blade connected to said armature member, said driver blade and said armature member are movable between an extended condition and a retracted condition; a control module that determines a position of said armature member relative to at least one of said first stage and said second stage based on a signal from said sense coil; and a trigger assembly connected to said control module and partially contained within said tool housing, said trigger assembly is operable to activate a driver sequence that moves said driver blade between said retracted condition and said extended condition, and said control module adjusts a force imparted on said armature member by at least one of said first stage, said second stage, and a combination thereof based on said signal from said sense coil.