Locks – Operating mechanism – Key
Reexamination Certificate
2006-05-09
2006-05-09
Barrett, Suzanne Dino (Department: 3676)
Locks
Operating mechanism
Key
C070S358000, C070S492000, C070S386000, C070S419000
Reexamination Certificate
active
07040126
ABSTRACT:
A pin tumbler lock is provided with one or more additional chambers for housing a secondary locking member for engagement with a portion of a key. The invention also provides a lock system comprising a plurality of locks, each lock including two chambers. The lock system has a potential of N chamber positions to provide a substantial increase in the number of effective unique pin tumbler combinations that can be produced on the same key section or profile by allowing the same pin tumbler combination to be repeated with different locations of these additional chambers.
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Barrett Suzanne Dino
Calfee Halter & Griswold LLP
Master Lock Company
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