IMPROVEMENTS IN CHRONOMETER ESCAPEMENTS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by William Clark at the Office of the
Commissioners of Patents on the 14th August 1883. Communicated to him
from abroad by August Wilhelm Kientoff, of Dallas in the County of Polk
and State of Oregon, United States of America
WILLIAM CLARK of the firin of A. M. and W. Clark of 53 Chancery Lane in the
County of Middlesex, Fellow of the Institute of Patent Agents, "IMPROVEMENTS
IN CHRONOMETER ESCAPEMENTS." [communicated to him from abroad by August
Wilhelm Kientoff, of Dallas in the County of Polk and State of Oregon, United
States of America]
This Invention relates to improvements in chronometer escapements and it
consists in the peculiar construction and arrangement of the parts.
c is a shaft
In the accompanying drawing Figure 1 is a view partly in section, and
Figure 2 a detail side view of the escapement partly in section.
journalled in the plates a a and carrying the clock wheel d which meshes with the
lantern wheel e or a pinion on the shaft journalled in the plates, which shaft also
carries the escapement wheel h toothed in the usual manner. i is the balanco
staff journalled at its lower end in the lower plate and at its upper end in a
bridge g secured to the upper plate and projecting over it, said plate being cut out
to allow the passage of the balance staff and other devices hereinafter described.
The balance wheel is secured to the balance staff i near its upper end. is a lug
or disc secured to the balance staff i and carrying a roller or pin m projecting
downward so as to engage with the escapement wheel h. n is a shaft journalled
at its lower end in the lower plate to the upper end of which is secured an
oscillating lever o cut out near its middle for the passage of the balance staff i.
Banking pieces (not shown) are secured to the upper plate near the opening therein
on each side of the free end of the oscillating lever o by set screws inserted in slots
in the said banking pieces whereby the latter are adjustable to and from the
oscillating lever and act as stops therefor. q is a coiled spring, one end of which is
secured to the balance staff i, the opposite end passing through a lug on the outer
end of the oscillating lever o. is a frame adjustably secured to the inner face of
the bottom plate a and provided with a cross bars journalled in the sides of the
frame, to which cross bar 8 is secured a vertical locking levert to the upper arm

page_text: of which is secured the spring u lying along and in contact with said locking lever
and projecting slightly above it at its upper end.
The upper end of the locking lever lies in the path of the oscillating lever o and
its lower end when thrown inward, engages with a tooth of the escapement wheel
and holds it locked. is a stud secured to the inner face of the lower plate a and
provided with a spring w the free inner end of which presses against the upper
arm of the locking levert so as to throw inward the lower arm of the locking lever
and lock the escapement wheel.
Motion being imparted to the balance wheel, the lever o oscillated by the coiled
spring q and striking lever t, the latter is unlocked from the escapement wheel a
tooth of the latter strikes the roller m which moves the balance staff and balance
wheel, the spring w throwing the levert into lock with the escapement wheel after
it has been moved the distance of one tooth.