| 摘要 |
A programmable, card-operable magnetic locking mechanism of the type having a movable tumbler-carrying core disposed above a fixed keeper plate provided with openings which normally receive the ends of tumbler magnets in the core to prevent movement of the core, some of the tumbler magnets being movable out of the keeper plate openings by a magnetically coded program card inserted into a slot above the core, and the remainder of the tumbler magnets being movable by a magnetically coded pass card inserted into a slot beneath the keeper plate. The program cards and the pass cards are coded with magnetized spots arranged to align with the tumbler magnets when the cards are inserted into their respective slots. The tumbler-receiving openings in the keeper plate are of two different sizes. If one of the tumblers extends into one of the smaller openings, the core cannot be moved. If none of the tumblers extends into a smaller opening, but one of the tumblers extends into one or more of the larger openings, the core can be moved a limited distance to actuate a first switch. If none of the tumblers extend into the keeper plate openings, the core can be moved through an extended distance to actuate a second switch. A control circuit which includes both switches is provided with a control switch for selectively rendering the first switch effective or ineffective to actuate an operator (e. g., a turnstile, parking gate, etc).
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