E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
70/55
E05B 27/00 (2006.01)
Patent
CA 1125046
INTEGRALLY CHANGEABLE KEY COMBINATION TRANSVERSE PIN TUMBLER LOCK ABSTRACT OF THE DISCLOSURE A pin tumbler lock employs elements which allow the key combination to be selectively changed without removing the lock from its installed position or disassembling or replacing any part of the lock. The lock comprises a housing member, a sleeve member axially and rotationally positioned within an interior opening of the housing member and a plug member rotatably received within an interior opening of the sleeve member. Operation of the lock requires release of the two shear surfaces defined by the contact surfaces of the sleeve, housing, and plug members. Transversely parallel extending bores formed through the three members receive elements of a locking stack assembly. The locking stack assembly includes tumbler pins, driver pins, change wafers and locking pins. Upon insertion of a proper key, the interfaces between tile locking stack elements are positioned at the two shear surfaces thereby allowing operation of the lock. The sleeve member additionally includes chambers containing change wafers, and the relative position of the locking pins can be selectively changed in the locking stack assembly upon positioning the sleeve member in a combination changing position. Means inter- connecting the housing, sleeve and plug members releases one of the shear surfaces by relative rotational movement prior to the release of the second shear surface by relative axial movement. Magnetic elements of the locking stack assembly resist separation of the locking stack elements during insertion and removal of the key. A set key having a reciprocating projection member may be employed to change the lock combination.
330162
Macrae & Co.
Monahan Brian J.
LandOfFree
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