Patent ID: 8336348
Filing Date: 2012-12-25
Classification: E05B,Y10T

Abstract:
1. A key operated removable core pin tumbler lock, comprising: a core configured to receive first and second key types, said core provided with a first plurality of holes configured to receive pin tumblers; a first cylinder configured to receive said core and provided with a second plurality of holes configured to receive pin tumblers, said second plurality of holes being equal in number and alignable with said first plurality of holes, said first cylinder comprising a first portion and a second portion, said second portion configured for limited rotation with respect to said first portion and provided with at least one hole of said second plurality of holes; a locking tab extending from a portion of the second portion of said first cylinder; at least one first tumbler positioned in selected of said plurality of holes in said first portion of said first cylinder, said at least one tumbler movable within its respective hole to a position establishing a first sheer line permitting unlocking of the lock; and at least one second tumbler positioned in said at least one hole of said plurality of holes in said second portion of said first cylinder; wherein said at least one hole of said plurality of holes in said second portion of said first cylinder is configured such that said at least one second tumbler is maintained at said first sheer line in the absence of a key of the second key type; and whereby insertion of said first key type permits unlocking of the lock, and insertion of said second key type permits rotation of said second portion of said first cylinder with respect to said first portion of said first cylinder.