Patent ID: 6604394
Filing Date: 2003-08-12
Classification: E05B,G07C,Y10T

Abstract:
An electronic lock, comprising:(a) a cylinder housed within and rotatable with respect to a shell; (b) an electrically powered locking mechanism capable of selectively interfering with rotation of said cylinder, said locking mechanism including a solenoid having a solenoid coil and a solenoid plunger, said solenoid plunger being in a first position when said lacking mechanism interferes with rotation of said cylinder, and said solenoid plunger being in a second position when said cylinder is free to rotate; and (c) a ferromagnetic enclosure having an opening for receiving said solenoid plunger, wherein said enclosure encloses said solenoid coil and at least a portion of said solenoid plunger when said solenoid plunger is in said first position and said second position so as to prevent a magnetic field applied externally to a front face of said cylinder from urging said solenoid plunger from said first position to said second position.