S.J. Arnheim, Berlin, Germany
Below are photos showing comparisons of the internal structure of
the S.J. Arnheim time lock and that of a Yale 3 movement lock. Notice the great
similarities. Both mount the movements within a solid unit that is in turn mounted between
springs located at the corners within the case. The design of the mount, even down to the
flange is identical. The bolt dog release is virtually identical in function and
appearance. The Arnheim using as spring - assist with the Yale relying on gravity.
It is possible that this spring was added at a later time. Some differences are in the
construction. The Arnheim uses a two piece construction for the movement mount as seen in
the third photo, note the four screws that secure the rear piece to the flat, front plate.
Yale, as did all all United States manufacturers at the time, used a mount milled from a
A very rare example of a foreign made time lock from the
pre-W.W.II era. The reason for the rarity is that the US makers completely dominated the
time lock market through aggressive marketing and patent litigation. This example dates
from around 1910 - 1920. It was clearly a copy from the Yale line of time locks. Yale's
design, as exemplified by these pictures, was established by 1904. The main differences
are in the shape of the time lock movements. The German example being rectangular with
Yale using the rounded bottom, commonly known as the 'coffin' style. Note, however that
the top of the front movement plates share the same curvilinear design, the balance and
escapement cocks are similarly designed (although this is a very common configuration for
this type of lever escapement). The dials are secured by the same style of a three screwed
escutcheon. The dimensions of the case makes this a direct drop-in replacement for the
Yale Model Triple K - one of Yale's most popular models.
Interesting how the case size is exact in English verses metric measurements! This
company was probably poaching off the safes that would have used Yale time locks.
Litigation would have limited the number of these locks produced before injunction.
It was not until well into the 1950's that foreign makers began to
make inroads into the time lock business. Some examples were
There are no movement numbers, case has two numbers stamped on the
rear, #10760 and 330/82, 6 1/2" w x 4 1/2" h x 3 1/8" d. file