| 摘要 |
<p>A dual pin tumbler lock and a key having two planar faces wherein the two planar faces of the key blade have similar concentric projections and depressions on both sides of a longitudinal axis for operating the lock, regardless of into which side of the dual lock the key is placed, and wherein each tumbler of the fixed part of the lock is made of two parts - one part telescopically slidable within the other, both parts being urged by springs against a corresponding tumbler housed in the rotating cylinder which corresponding tumbler is likewise made of two telescopic parts.</p> |
