ELECTRONIC RESET FOR SOLENOID ACTIVATED CONTROL IN AN ELECTRONIC LOCK

摘要

The technique for electronically resetting a magnetically sealed solenoid to an unattracted, unactuated position is described for use with solenoids which have either a residual magnetic or a permanent magnet holding force necessary to retain the armature of the solenoid in its actuated position until such time as the armatur e is either physically displaced by a mechanical force or an electronic signal is app lied to the solenoid. This displacement creates a reverse polarity magnetic field, effec tively overcoming the magnetic field acting to hold the armature in its actuated positi on, permitting a small mechanical force to reset the armature. In order to prevent a lock or similar device from being conditioned for opening and possibly left in that cond ition for a significant period of time while unattended jeopardizing the security of t he container and its contents, the actuation of the armature in the reset or releas e phase may occur a relatively short time following its actuation.