Diebold Safe & Lock Co., Canton, Ohio, DAT movement prototype

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Short-term, DAT timer c.1950. Seth Thomas. The unusual feature of this movement is the use of two platform escapements within one timer movement resulting in a triple plate design. Note the front main wheel is denoted from 10 to 30 minutes in five-minute increments which is adjustable via two removable screws and the rear main wheel also has the same denoted sequence; but with a permanent pin, in this case at 20 minutes. There is no winding square for a key to directly wind the movement.  One main spring and wheel train drives both escapements, each providing redundancy. This design appears to be an attempt to provide the redundancy of two separate movements, but within the confines of one movement; but must have been a failure as it does not appear in any example seen so far. Even with two platform escapements, there is not complete redundancy as the rest of the movement train is shared. This author has never seen a dual platform escapement design for a time lock before.

This movement was likely a prototype developed for Diebold to test a delayed timer concept, aka a DAT time lock. In these types of locks the timer can be quickly and automatically wound and put on guard through the action of throwing the bolt for the cash drawer. The amount of time would be pre-set through the pin in the front wheel. DAT's were used to thwart daytime robberies where the thief would not have the time to wait around for the time lock to go off guard. Yale and Mosler made a variety of these types of locks. Some were put on guard by manually operated boltwork, others by spinning the combination lock dial.

Diebold never produced a line of DAT time locks.  file 301