Yale & Towne Manufacturing Co., Stamford,
Connecticut - 3 movements, Type Triple K, v.1, v.2, v.3,
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.
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wave" by Yale which superseded the nickel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
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
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.
American Genius Nineteenth Century Bank Locks and Time
Locks, David Erroll & John Erroll, pg. 268