| 摘要 |
A security system having a secure enclosure for holding an object. Access to the enclosure is controlled by a combination lock having a tumbler arrangement adapted for having its combination changed either by hand or with use of a key. The tumbler arrangement includes an apparatus for mounting a plurality of tumbler wheels in a stacked relationship for rotation about an axis. Each of the tumbler wheels has an inner element releasably engaged with a circumferentially disposed outer element. Each of the outer elements has a peripheral gate and a mechanism for masking the gate. A mechanism is provided for maintaining the inner and outer elements in an engaged condition for simultaneous rotation under normal tumbler operation, and a peripherally gated rotatable driver wheel rotates the tumbler wheels. A fence lever includes a nose for contact with the driver wheel and a fence for contact with the tumbler wheels. The tumbler arrangement also includes an apparatus for preventing contact by the fence with the circumferential edges of the tumbler wheels while the tumbler wheels are being rotated. Finally, a mechanism is provided for axially disengaging the stacked inner elements from the stacked outer elements by the key while simultaneously preventing rotational and axial movement of the outer elements as the disengaged inner elements are rotated to change the combination of the tumbler arrangement in the combination lock.
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