Yale & Towne Manufacturing Co., Stamford, Connecticut - 3 movements, Type Triple K, v.1, v.2, v.3, K3L

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Yale 3mvt-K.JPG (2321929 bytes)  Yale 3mvt-K (1).JPG (2185236 bytes) A

Yale 3mvt-silver.jpg (599851 bytes)  Yale 3mvt-silver2.jpg (753426 bytes) B

Yale 3k-brass.JPG (2080284 bytes)   Yale 3k-brass (1).JPG (2345794 bytes) C


Yale 3mvt-plastic.jpg (539819 bytes) E

Concurrently with the introduction of the Triple L in 1892, Yale introduced the Triple K. 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. (1)

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. file 0

C. Model Triple K, v.2. c. 1910. 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. 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. Model Triple K v.3, c.1915. Late in the model life, around 1915, some examples of the Triple K did away with the space in the right case interior containing a bolt dog and replacing it with an actuator arm, This style was made in limited numbers. Case # 6524, movement #27384, 27385, 27386 file 53

E. c. later 1950's. Type K3L 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. 


A Triple K v.3 mounted in a Cannonball safe, below.



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