Yale & Towne Manufacturing Co., Stamford, Connecticut - 4 movements, Quad-M
A. Quad-M, c. 1900. This was Yale's biggest and heaviest time lock using the companies' largest movements, the "M" size. Weighing in at twenty two pounds it was for use in the largest vault doors, see photo below. This example had the earlier nickel plated, geometrically damascened finish. The model was introduced in 1899 and was advertised to have a combined pull exceeding seventy pounds. It was a bit of an odd promotion since the Quad M did not depend on the movements to "pull" anything. It was sold for use with hand operated bolt works only and simply dropped the side release block within the case. This model as well as some others in the Yale line included an "Open Attachment" visible though the case door to the side of the movements. The mechanism allowed the lock to be wound and set but not actuated when the vault door is locked with the combination lock during the business day. Once the OPEN lever is thrown up, the time lock will secure the door when it is closed and locked. This first appeared on the Holms Electric time lock and also as the Infallible Chronometric Attachment™ in the Hall and later Consolidated Time Lock Company time locks. (1) The fact is that this model was scaled up to match the size of the larger vault doors. It would not look good for a massive door to depend upon a 'dinky' time lock to guard it even if this was a perfectly efficient design. Appearance, decoration and promotion was a big part of the industry at this time. The profit margins were large and so litigation to keep out competitors as well as impressive presentation to the customer played a large part in the design of these time locks. Yale made 109 of the early nickel plated model shown here and only two are known to survive.(2) 11 3/4"w x 5 1/2"h x 3 1/4"d. Case #57, movement #2482, 3988, 3989, 3990. file 145
B. Quad-M, c. 1908. Same model lock as above. Quad-M models beginning in 1908 had a brass machined case finish aka the 'bronze wave', smaller glass and winding eyelets in the metal door. Twenty five of this style are known to have survived. This example has all original consecutively number movements, a rare event with a four movement lock. 11 3/4"w x 5 1/2"h x 3 1/4"d. Case #157, movement #3578, 3579, 3580, 3581. file 153
The first two photos below show large round vault doors equipped with a Yale Quad M similar to that shown in examples A and B.
The two photos below show Yale Quad M timelocks mounted in a vault doors made by Mosler and York Safe Co., repectively. One would be forgiven for thinking that the blank time lock box in the first photo may have been for an optional additional Yale quad M time lock, making for eight time locks in a door, certainly a record! But the second photo reveals that the left hand time lock case is simply a cover for the components that are normally seen connecting the combination lock units. Look carefully and you will see the case bolt holes of both cases are matching up between the two boxes and that slide bolt runs all the way from the left hand upper corner of the protective case where it connects to the combination lock work through to the actual time lock where it is controlled by that unit. Perhaps this arrangement was used to give a nice symmetric presentation to the door.
(1)American Genius Nineteenth Century Bank Locks and Time Locks, David Erroll & John Erroll, pg. 294, (2) pg. 295