| 摘要 |
A double key changeable safety deposit lock includes a movable bolt and associated bolt plate including cam surfaces to be engaged and moved between open and closed positions by turning renter and guard keys in the lock, a plurality of gated tumbler renter key levers to be engaged by the renter key, a plurality of gated tumbler guard key levers to be engaged by the guard key, each of the levers being moved to align their respective gates to receive latch members on the bolt plate upon manipulation of the two keys to allow opening of the lock and wherein pivot means are provided for each lever including a plurality of individually selectable pivots such that the pivotal axis of each lever may be selectively varied to provide for different combinations of lever movement required by an associated key to align the associated gates. Releasable pivot selecting means are provided for normally engaging certain ones of the pivots of the levers which is rotatable to allow release of the lever pivots so that the levers may be moved to a new combination of positions by the insertion and manipulation of new renter and/or guard keys and then held in the new combination by re-engaging the pivot selecting means, also referred to as a fulcrum means, with the selected ones of the pivots whereby both keys for the double key lock are changeable.
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