Improvements in or relating to Movements for Watches or Clocks.
Year: 1899

page_text: Date of Application, 11th Apr., 1899-Accepted, 17th June, 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Movements for Watches or Clocks.
A communication from GIUSEPPE DANASINO AND COMPANY, of Pontedecimo,
Kingdom of Italy.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The object of the present invention is an improved spring driving movement
for watches or clocks in order to obtain a uniform potentiality at the beginning
as well as at the end of the unwinding of the spiral spring thus securing the
advantage of a greater regularity and precision of motion.
The invention is illustrated in Figures 1, 2, 3 of the accompanying drawings.
The spiral spring a-shown in Figure 3 in transverse section-gradually in-
creases in width or thickness from the outside to the inside or from the outer end
to the inner end secured to the central spindle in the barrel b: whereby the
compensation of the spring itself and the going of the watch or clock in a
regular manner for more than thirty days is obtained. In this way the most
perfect chronometrical precision is secured, without being obliged to adopt the
ordinary means of compensation, as, for instance, the fusees used for chrono-
meters, which are very complicated and expensive.
The arrangement and form of the hollow spindle c (Figure 3) permits the
barrel to be placed at the centre of the motion, which gives ample room for
the arrangement of the toothed wheels: simplifying the construction of watches
and permitting them to be made of smaller dimensions.
Said spindle c, as in ordinary spindles, carries the barrel b (Figure 3) and the
winding wheel & which gears with the wheel e (Figures 1-2): f is the driving
pinion which gears with the wheel h of the barrel, rr are the multiplying
wheels, and g the centre wheel through which passes the spindle g¹ which can
rotate in the hollow spindle c.
The watch is then constructed and in such manner that should it be desirable
or necessary to change the parts forming the movement, the principle on which
this invention is founded becomes in no way altered.
The arrangement of the hour hand is the same as usual.
Having now particularly described and ascertained the nature of the said in-
vention as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is :-
1. A driving spring for watches or clocks such as a the width or thickness of
which gradually increases from one end to the other of its length substantially
as described.
2. A movement for watches or clocks comprising a spiral spring such as a on
a hollow spindle such as c, a spindle g¹, rotatable in said hollow spindle which

page_text: is placed at the centre of the movement said spindle g¹ also carrying the central
wheel substantially as described.
3. The complete movement for watches or clocks substantially as described
or illustrated in the accompanying drawings.
BOULT & WADE,
Agents for the Applicant.