| 摘要 |
A twisting tumbler lock with a side bar (16,16') is provided with additional levels of security by a axially reciprocable slider (24,24') which is normally positioned to block operation of the side bar (16,16') but is moved by a specially configured key (34,34') to free operation of the side bar (16,16'). This provides a third level of locking security, it also allows master keying. The unique key (34,34') has a portion of a rib (40) formed to cooperate with the slider (24,24') to further allow key control.
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