       
Time Lock Restoration Page
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Model #2 version 6, with 46 hour black dials. 1877. This model marked a significant change from the earlier round roller bolt to the cello shaped drop bolt (cello-bolt) which was used with great success in subsequent models. The cello-bolt's two piece spring loaded mechanism allowed this model to do away with the auxiliary bolt that was needed in the earlier roller bolt designs. Project: 1/08. |
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Model #4 version 2. c. 1884. In July of 1878, Sargent and Greenleaf introduced their Model #4 time lock. It was smaller than the #3 giving it the advantage of being able to fit in more and smaller existing vault doors, but with no compromise in security or features. This model was the first time the firm employed three new features. First, were Geneva stops which would not become standard on the rest of their line of time locks until a few years later. Second, a split front movement plate, the beginnings of a modular design that would become fully developed later. Third, the shift from the door having a lever type lock to the simpler handcuff style. Project 08/06. |
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