| 摘要 |
This invention describes a lock where each of several tumblers is shaped as a disc and each has gear teeth along parts of its periphery. The teeth mesh with two partial racks that are formed on two side bars. These side bar operate in a manner similar to side bars in many popular locks of to-day. These tumblers are set or re-set into positions by a double bitted key that passes thru a central opening in each tumbler. By rolling the tumblers along the racks on the side bars the lock can be opened or closed. The key can be changed by merely opening the lock with one key and closing it with another.
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