Improvements in or relating to Spring-motors for Watches or Clocks.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Spring-motors for Watches or Clocks.
A communication from GEORGES FAVRE-JACOT & CIE., of Billodes s/Locle,
Switzerland.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of London,
Chartered Patent Agent, do hereby declare the nature of this invention to be
as follows:-
This invention relates to an improved spring-motor for watches or clocks.
The shaft of the motor is provided with a collar preferably made in one
piece with said shaft and provided with a tooth or finger which is intended to
engage the usual stopwheel pivotted to the mainspring barrel with a view to
limit the number of revolutions of the said mainspring barrel with regard to the
shaft.
The said stopwheel may be of any suitable construction.
The mainspring barrel has an inner nave or sleeve in which the shaft is free
and around or upon which is rotatively mounted the core, the hook or pin of
which is fixed to the inner end of the mainspring contained within the said
mainspring barrel. The outer end of the mainspring is fixed to the inner
wall of the said mainspring barrel. The core is free on the sleeve of the barrel,
but it is provided with a pin or projection which engages, with a certain
amount of play or looseness, in an opening or recess of a disc which is fixed
on a square portion of the motorshaft.
The said opening or recess is large enough to allow the pin or projection
engaging therein to have a certain amount of play, the purpose of this being
to allow the core to make a slight backward rotation when the mainspring has
been wound up.
The arrangement of the core around the sleeve has the advantage of acting
like a brake when the mainspring is wound up.
The disc may be toothed in order to gear with a winding-up-wheel of usual
construction or the said disc may be made of the same diameter as the core.
In some cases the disc may be lodged within the mainspring barrel.
The disc may be provided with a notch or recess in which engages the pin
of the core, or the core may be formed with two projections engaging two
corresponding notches or recesses in the disc.
The disc may be made of the same diameter as the inner portion of the main-
spring barrel whereby it will act like a cover of the same.
Dated thin fith in of Febru 1899
BOULT & WADE,
Agents for the Applicant.

page_text: Improvements in or relating to Spring-motors for Watches or Clocks.
A communication from GEORGES FAVRE-JACOT & CIE., of Billodes s/Locle,
Switzerland.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of London,
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
ascertained in and by the following statement:-
This invention relates to an improved spring-motor for watches or clocks
and the accompanying drawings show several constructions of such spring-
motors embodying the invention.
In the drawings:-
Figure 1 is a cross-section of one construction of the improved spring-motor.
Figure 1b is a top view of Figure 1.
Figure 2 shows a cross section and under side view of the core C of the
spring-motor shown in Figure 1.
Figure 3 shows a cross section and under side view of the disc or wheel E
of the spring-motor shown in Figure 1.
Figure 4 is a cross section of another construction of the improved spring-
motor.
Figure 5 shows a cross-section and under side view of the core C of the
same.
Figure 6 shows a cross-section and under side view of the disc E of the
construction shown in Figure 4.
Figure 7 is a cross section of another construction of the improved spring-
motor.
Figure 8 shows a cross section and under side view of the core C of the
same.
Figure 9 shows a cross section and under side view of the disc E3 of the
construction shown in Figure 7.
Figure 10 is a cross section of another construction of the improved spring-
motor.
Figure 1 shows a cross section and under side view of the core C of the
same.
Figure 12 shows a cross section and under side view of the disc E of the
construction shown in Figure 10.
In the several figures of the drawings the same letters of reference refer to
the same parts.
The shaft A of the motor is provided with a collar a preferably made in
one piece with said shaft and provided with a tooth or finger a¹ (Figure 1)
which is intended to engage the usual stop-wheel F. pivotted to the main
spring barrel B. with a view to limit the number of revolutions of the said
main spring barrel with regard to the shaft A.
The said stop wheel F may be of any suitable construction.
The main spring barrel B has an inner nave or sleeve 6 in which the shaft A
is free and around or upon which is rotatively mounted the core C (Figure 2).
the hook or pin c of which is fixed to the inner end of the main spring D
contained within said main spring barrel B. The outer end of the main
spring D is fixed to the inner wall of the said main spring barrel B. The
core C is free on the sleeve of the barrel B, but it is provided with a pin
or projection c¹ which engages, with a certain amount of play or looseness, in

page_text: an opening or recess e¹ of a disc E¹ (Figure 3) which is fixed on a square
portion of the motor shaft A.
The said opening or recess e¹ is large enough to allow the pin or projection c¹
engaging therein to have a certain amount of play, the purpose of this being
to allow the core C to make a slight backward rotation when the main spring
has been wound up.
The arrangement of the core C around the sleeve has the advantage of
acting like a brake when the main spring is wound up.
The disc E may be toothed as shown in Figure 3 in order to gear with a
winding-up wheel of usual construction; or the said disc may be made of the
same diameter as the core C as shown at E2 in Figures 4 and 6 or at ³ as
shown in Figures 7 and 9. In these two latter cases the disc E2 or E³ may
be lodged within the main spring barrel B as shown in the Figures 4 and 7.
In Figures 4 and 6 the disc E is provided with a notch or recess e in which
engages the pin c¹ of the core C. In the Figures 7 to 9 the core C is formed
with two projections e engaging two corresponding notches or recesses e³ in
the disc E.
In the construction shown in Figures 10 to 12 the disc E is made of the
same diameter as the inner portion of the main spring barrel whereby it will
act like a cover of the same as shown in Figure 10.
Having now particularly described and ascertained the nature of this said
invention, as communicated to me by my foreign correspondents, and in what
manner the same is to be performed, I declare that what I claim is:--
1. In watches or clocks, a spring motor comprising a shaft having a collar
provided with a tooth or finger made, preferably in one piece with said shaft,
in combination with a main spring barrel, the inner sleeve or nave of which
is traversed by said shaft and is surrounded by a rotative core, and a disc
firmly fixed to said shaft and provided with one or more suitable recesses or
openings engaging with a projection or projections of said core, substantially as
described.
2. A spring motor for watches or clocks substantially as described or illus-
trated in Figures 1, 2 and 3 or in Figures 4, 5 and 6, or in Figures 7, 8 and 9
or in Figures 10, 11 and 12 of the accompanying drawing.
Date this 6th day of November 1899.
BOULT, WADE & KILBURN,
Agents for the Applicant.