Yale Model Automatic Triplex, made as substitution of for Banker's Dustproof after acquisition by Mosler - 3 movements

The Yale Triplex with a small on-board automatic bolt motor. That motor was wound by the arbor seen near the bottom left hand corner of the time lock.

Banker's Dustproof created in 1906 was a subsidiary of the Victor Safe and Lock Company and lasted through 1916 when Mosler bought the company, an example of their three movement time lock is shown on the right. When Mosler bought Banker's Dustproof, at the time that they started manufacturing time locks, they were unprepared to fill the number of orders that they received. As a transition solution, Yale made right hand wind L movements for them for their new models. Yale also briefly manufactured a small number of complete time locks that were exact replacements for the Banker's Dustproof line of time locks, example on the left. This time lock is one of those. It employs the right hand wind L-movements which Yale made for Mosler's other introductory time locks. Yale made left hand wind L movements for all of their own models, they were counterclockwise wound. But their line of time locks that employed the largest movement, the size M were all clockwise wound.

In this photo one can see the superficial similarities between the Yale Triplex and the Banker's Dustproof time locks. All of the exterior dimensions are identical. The automatic bolt motor located in the base of the time lock is of identical configuration and the bottom split case to accommodate the bolt motor is the same. However here the similarities end. The rest of the time lock is all Yale design with Yale's 'coffin' style time locks made by Seth Thomas mounted on their one-piece spring suspended platform in contrast to the individually spring-mounted Illinois Watch company movements embedded into the rectangular movement frames provided for banker's Dustproof. The other noticeable difference is in the snubber bar and time lock levers. Another subtle difference is that the dial pin actuating the movement lever on the Yale example is on the front of the dial as was more common in the industry, while the pin was on the the underside of the dial in the Banker's example. Mosler kept this dial configuration after transition to their own design.

The first photo shows how the case is made in the exact same way with the split bottom containing the bolt motor held to the main upper case via four screws. The next photo shows the same small slice taken from the rear upper left hand corner of each case since the Yale substitution had to be an exact fit into where the original Dustproof time lock went.

Type L Triplex for Bankers Dustproof, 1916. This lock is equipped with a spring loaded mechanism (a bolt motor) to automatically release the vault door locking bolts when the timer runs down. The spring loaded mechanism that drives the release is wound through the hole on lower left corner of the time lock. Case #14, Uses Type L consecutively numbered movements #4989, 4990, 4991. 5.75" w x 5.25" h x 2.75" d. file 98