PICK RESISTANT LOCK HAVING LATERALLY MOVABLE WAFERS

• Main Author: MERCURIO L,US
• Format: Patent
• Language: English
• Published: 17.12.1974
• Subjects: ACCESSORIES THEREFOR; FIXED CONSTRUCTIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HANDCUFFS; KEYS; LOCKS; SAFES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; WINDOW OR DOOR FITTINGS

A pick-resistant lock construction in which the rotating plug disposed within a relatively fixed cylinder comprises a plurality of generally planar plug elements each supporting a resiliently urged locking wafer which in relatively unstressed condition engages a corresponding recess in the fixed cylinder. The plug elements define a recess accommodating a wafer, the recess including a laterally extending portion. The wafer includes a corresponding laterally oriented surface which will clear said laterally extending portion of said recess with normal operation of the lock. The wafer executes a small degree of rotational motion relative to a plug element when an attempt is made to rotate the plug element during a picking operation, so that subsequent rectilinear motion of the wafer relative to the plug element imparted by a picking instrument will cause engagement of said laterally oriented surface with said laterally extending portion of said recess to inhibit further longitudinal motion to a degree sufficient to prevent disengagement of the wafer from the cylinder.