Double cylinder lock with key retention

E - Fixed Constructions – 05 – B

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70/48

E05B 65/06 (2006.01) E05B 9/10 (2006.01)

Patent

CA 1106199

DOUBLE CYLINDER LOCK WITH KEY RETENTION ABSTRACT OF THE DISCLOSURE A double cylinder lock constructed with a single tailpiece driver and a clutch. The interior lock key can be extracted only when the lock bolt is retracted and not when the lock bolt is extended. The driver and clutch arrange- ment prevent either cylinder from becoming out of time, regardless of which cylinder is used to throw the bolt. -1-

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