Yale & Towne Manufacturing Co., Stamford, Connecticut - 3
movements, Type E
The complete line of Yale Type A through G time locks pictured from left to right. The A was a unique prototype
piece. Only the
Type B through E series went into production. The G was only made as
salesman's samples. Since the Type A was a prototype and at the present time only one Type
C and complete G has been found, those facts makes this collection unique in that it
contains the complete set of all the examples. No records for or examples of
a Type F are known.
The second generation models as represented by Type D and E did away with
the movement disk being turnable for the purposes of winding and replaced it
with a central winding square upon which is also mounted the setting dial
hand. The method of reading the time is now reversed by using fixed dial
around the perimeter and a moveable hand that rotates as one winds the time
lock to show the correct time duration until the lock would go off guard.
These was a great improvements over the more fragile and harder to read
system as represented in the earlier design. Since one did not need to grasp
the movement disk as it was now a fixed piece in which the watch movements
are mounted, it could now be sealed within the case with only a hole needed
through the front glass for the winding key as is common in many time locks.
This also allowed Yale to dispense with the expense of an external case of
the Type B to protect the moveable disk and the gearing behind it from abuse
and dirt. The greater ease of use and accuracy of the new winding system, dial design
and bezel overwind stop flag allowed Yale to dispense with
the overwinding pins. (1)
Front elevation of the Type E with glass bezel attached.
Unlike the screw-down bezel of the Type A and the bayonet style of the Type
C, this one had a keyed slot that allowed it to only go in one position. Once
seated the bezel could be rotated. This
was essential since the introduction of the overwinding stop flag which had to
be positioned so as to always be ahead of the pointer to perform its function,
this is the red pointer near the 6 o'clock position.
Front elevation of the Type D with glass bezel removed. Note the larger,
better defined dial numbering.
Three quarter view with the glass bezel attached and next removed. The dial
numbering is more readily seen.
The Yale Type E time lock, 1889, demonstration of winding and setting the
Yale Type E, 1890. The Yale Type E was designed with a release to be
used with an automatic bolt motor. The company of E. Howard & Co. and later,
after 1902, Seth Thomas supplied nearly all of the movements for Yale time
locks (until the 1950's when movements from Switzerland were used). An
exception are the Yale Type B through G models which used a modified version
of a pocket watch; size #14, model 84 movements by American Waltham Watch
Co. A smaller Waltham movement was also later extensively used in Mosler time
locks. The movements were designed with anti-magnetic qualities - cutting
edge technology for the day. The Type E was introduced to correct some of
the design deficiencies found in the earlier Type C, those being the
problems of over winding, the difficulty of handling the fragile rotating
movement base, and setting the time due to the small dial numbers and recoil
of the movement springs through the motion of the rotating base.
Yale sold a total of 139 Type E's between May 1889
and June 1892. Today there are fewer than fifteen Type E known . 4.5"w X 5"h
x 3"d. Case #6,
movement plate #98, movements, #3509767, #3509613, #4527341. file
An interesting aside is the fact that both Seth Thomas and E.
Howard were companies that made a full line of clocks and watches. From large tower clocks
(for public buildings) to domestic clocks to watches as well as movements for time locks.
Click here to see a medium sized Seth Thomas and Howard tower clock.
A Yale Type E mounted to a MacNeale and Urban safe door.