| 摘要 |
A combination lock having a selectable combination is provided wherein the combination cannot be changed when a case to which the lock is attached is closed. The lock has a slidable shaft with a plurality of sockets rotatable about said slidable shaft and the sockets are axially movable with the shaft and maintain their relative axial position on said shaft. There are a plurality of rollers connected to the sockets and each roller has one of the sockets associated therewith. The sockets and shaft are axially movable with respect to the rollers and rotating at least one roller relative to its associated socket varies the combination. The lock has an axially movable frame and a closer associated with the frame which can move the frame in one direction to open and close the case and in the other direction to place the lock in position to change the combination. Means are provided to restrain the frame in the combination changing position once the combination changing position has been attained and means to immobilize the operating means when the lock is in an off-key position.
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