Yale & Towne Manufacturing Co., Stamford, Connecticut - 3 movements, Type Triple K, v.1, v.2, v.3, K33L

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 In 1892 Yale introduced their most popular sized time lock movements; their medium sized L-movement with the introduction of the Triple K for manual bolt work safes and their Triple L for use with automatics. Early on, the Triple K had relatively minor sales volume. However,, the popularity of automatic bolt actuators began to fade between 1910 and the beginning of the First World War. With the return of hand-actuated safes, the Triple K became a a major time lock model for Yale, and by the time production ended in the 1950's, more than three-thousand Triple K's had been sold.

Their largest was the M-movement and their smallest was the T-movement. The first version of the the lock featured a large front door glass encompassing the winding eyelets. The second version changed that glass to a smaller format leaving the winding holes through the metal door no doubt due to glass breakage from careless winding. The v.1 and v.2 designation hold for their models Triple K, Triple L, (manual, automatic, 3 L-movements), Triple O, Triple P, (manual, automatic, 3-M-movements), Quad K (K4), Quad L?, (manual, automatic, 4 L-movements), Quad M and Quad N, (manual, automatic, 4-M-movements). I have not seen a Quad automatic with L-movements, hence the ?-designation but I would suspect they exist.

In the manual bolt operated models there was a significant design change about the time the v.2 door design appeared. The snubber bar is changed so it does not actuate against an external lever that is connected to the bolt dog as can be seen in the v.1 and a few early v.2 models. Instead the actuator is placed behind the front plate and so the snubber bar now has a square keyed mount behind the right hand lower bolt that actuates the bolt dog. There were no v.1 door style locks made with the bolt dog change. Some v.2 door styles had the original exterior dog lever, but most were in half-glass door cases by the time of the dog lever change.

The Bronze Wave case design came along after 1915 and was available only in v.2 across the Yale line. For Yale's other locks, those which were two movement designs or those equipped with their small T-movements, were all introduced later and all have the v.2 door design.

A

   B

   C

   D

D

Concurrently with the introduction of the Triple L for use in safes with an automatic bolt motor in 1892, Yale introduced the Triple K for use on safes with manual boltwork. Based on a similar format to that of the Triple L, the Triple K also used three seventy-two hour L-sized movements but is distinguished by the extra space visible to the right side between the case and movements that houses the bolt dog. Also there characteristic bulge at the base of the case recognizable in the Triple 'L' is missing.

Early on the triple K was a minor variation and did not play an important role. However, the popularity of automatic bolt actuators began to fade between 1910 and the beginning of the First World war. With the return of hand actuated safes, the triple K became a major lock model for Yale, and by the time production ended in the 1950's more than three thousand Triple K's had been sold.

A. Model Triple K, v.1. c.mid 1890's. This lock uses Yale's' medium sized Type L movement. The space on the side contains the mechanism for the bolt dog and were used in safes with manually operated bolt work. Locks produced early on, version 1, had the full glass door. A few years into production the door design was changed, see next example B, where the winding holes were through the metal door rather than the glass to prevent breakage in connection with sloppy insertion of the winding key, version 2, (this example has replacement glass without the winding eyelets). This lock was introduced concurrently with the Triple L and the same design changes to door occurred in that model also. The Triple L model was designed for safes with automatic bolt works. The early case number puts this very early in production, however the movements appear to be a bit later. Case #65, consecutive movement numbers, 7373, 7374, 7375. 6 1/4"w x 4 1/4"h x 3 1/8"d. file 144

B. Model Triple K, v.2. 1904. This example exhibits the redesigned door. Case #370, movement #21885, 21886, 21887. 6 1/4"w x 4 1/4"h x 3 1/8"d. From a bank vault in Stockbridge, Michigan This was the first time lock I had acquired back in 1980. file 0

C. Model Triple K, v.2. c. 1915. This example has a later brass colored case design with a circular machined pattern dubbed the "bronze wave" by Yale which superseded the nickel plated cases. There was a significant design change between this model and the previous two. Here the snubber bar does not actuate against an external lever that is connected to the bolt dog as can be seen in the v.1 model. In the v.2 that actuator is placed behind the front plate and so the snubber bar now has a square keyed mount behind the right hand lower bolt that actuates the bolt dog. This change was carried through the rest of their product lines for manual bolt work safes in their Triple O and Quad M series. The photos below show this model in situ in a York Safe & Lock vault door. Case #1628, movements consecutively numbered #40141, 40142, 404143. file 148

D. c. later 1960's. Type K33L with consecutively numbered L sized Swiss-made movements. The movements were manufactured for and distributed by Herman D. Steel, Co., Philadelphia, PA. and sold to Yale before Yale sold its time lock division to Diebold. In the later half of the 20th century many manufacturers cut costs by dispensing with the metal door and replacing it with a screwed on plastic cover; often with integral lenses for easier reading of the dial. c. 1950's or later. file 57

A Triple K, v.2 mounted on a York vault door, below.

   

First photo has a Triple K within a Yale & Towne door and the last photo shows a K3L on a modern post 1970's door. 

                

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(1) American Genius Nineteenth Century Bank Locks and Time Locks, David Erroll & John Erroll, pg. 268