Sargent & Greenleaf, Rochester, New York - 3 movements, Model Triple A mounted to Burton-Harris #0 bolt motor

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The triple A series was produced from 1889 through 1922 concurrently with the model B and C.

                S&G 3mvt w bolt motor.JPG (867917 bytes) A

The Burton-Harris #0 bolt motor was the most powerful bolt motor supplied to S&G at this time. The average power of the locking springs is 350 lbs., and that of the unlocking springs 500 lbs. The #0 will operate 18 to 24 ordinary bolts. (1)

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 S&G 3mvt w bolt motor (5).JPG (853938 bytes)  S&G 3mvt w bolt motor (3).JPG (891383 bytes)

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A. Model Triple A, (later no. 6304), with associated Burton, Harris & Co. bolt motor, 1889. Uses the same sized movements as found in the more common Model Triple B, but in a smaller case; excluding the normal bolt works, hence the smaller size. The lock was designed to sit on top of the separate automatic bolt opener (device below time lock). This is the company's first modular three movement design and this lock was one of the first produced. While the design used modular movements they were not yet interchangeable, and each had it's specified location. Interchangeability would not occur until 1895. One can see scratch marks made by the installer on each movement;  I, II, III indicating their order. The snubber bar is of the older design made with separate, welded pieces and the serial numbers of the case and movements indicate that this was a very early in the production. The Burton-Harris type motor was one of the first to be used by S&G. Burton was also one of the first makers of automatic bolt motors beginning in 1884. Early on Burton designed products to be used with the nearby Consolidated Company in Cincinnati, Ohio. However by 1890 Burton developed a closer relationship with Sargent & Greenleaf with Sargent eventually acquiring Burton sometime in 1901. (2) Click here for a rare two movement version of this type of lock and here for another, later version of this lock. Case# 46, consecutively numbered "L"-size movements #199, #200, #201. This is the earliest known version of this lock. Bolt motor # 331. file 111

One can infer the strength of the spring inside the bolt motor by the length of the key-grip giving leverage to the operator to wind it. The last picture shows the actual Diebold safe door that this lock was removed from. At this time Diebold was a safe manufacturer and had not yet entered the time lock market. See here an identical type Mosler safe door retro-fitted with a later model Mosler time lock. The advantage of bolt motor system is the fact that the bolts do not have to be manually opened through an external crank. As long as the safe was in a secure location, there was also no need for a combination lock. The safe is set to open only when a trusted person is present  This eliminates any holes in the door needed for the bolt crank or combination lock making for a much more secure door. Of course the owner must be sure that he is present when the time lock actuates the bolt motor or else it is open to anyone! The access into the door through these holes for safe crackers must have been a real problem otherwise why would  anyone choose the inconvenience and risk of a safe that opened automatically? See another Burton-Harris bolt motor with a unique Hall time lock.

 B. Model Triple A., c. 1890's. Same as above but with slightly later scalloped door design. Case # A-571, consecutively numbered "L"-size movements #4525, #4526, #4527.Click here for a rare two movement version of this type of lock and here for another, later version of this lock. file 68

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(1) Sargent & Greenleaf Bank Locks catalog #12, 1907

(2) American Genius Nineteenth Century Bank Locks and Time Locks, David Erroll & John Erroll, pg. 258