Improvements in Stop Works for Going Barrel Watches.
Year: 1896

page_text: Date of Application, 3rd Nov., 1896
2000
PROVISIONAL SPECIFICATION.
Improvements in Stop Works for Going Barrel Watches.
I. HENRY ROBOTTOM of Rose Cottage Over Whitacre in the County of
Warwick, Watch Manufacturer do hereby declare the nature of this invention
to be as follows:-
Round the boss of barrell cover I cut a sink sufficiently deep to leave the cover
sound. After which I cut a dovetailed slot extending from the sink to the rim
of barrell cover. In the dovetailed slot I fit a steel slide to move backward and
forward easily. On the outer end of slide I fix a pin perpendicularly so as to
form a rest against the outer coil of mainspring. On the inside of barrel rim I
fix a spring to act on the pin in slide so as to press it against the main spring
so that when the spring is wound the slide is pressed forward until it reaches
across the sink round the cover boss. The slide then comes in contact with a
pin in the barrell arbor and locks it.
Dated this 2nd day of November 1896.
COMPLETE SPECIFICATION.
Improvements in Stop Works for Going Barrel Watches.
I, HENRY ROBOTTOM, of Rose Cottage, Over Whitacre, in the County of
Warwick, Watch Maker, do hereby declare the nature of my said invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
My invention has for its object improvements in stop works for going barrel
watches by which I provide means for preventing the main spring from being
broken through over winding which so frequently occurs with watches as at
present constructed, and also should the spring break, by my improvements no
damage can possibly be done to the internal parts of the watch.
In order that my invention may be more clearly understood and easily carried
into practical effect I have appended hereunto a double sized sheet of drawings
upon which I have illustrated examples of my improvements.
Figure 1 is a plan view of a watch barrel showing my stop arrangement applied
thereto.
Figure 2 is an inverted plan view of Figure 1 with the lid or cover of the
barrel removed.
Figure 3 is an elevation of Figure 1 with a portion of the barrel broken away.

page_text: Figure 4 is an internal plan view of the barrel lid or cover showing my stop
arrangement applied thereto.
Figure 5 is a similar view to Figure 3 showing the method of operating the stop
arrangement as shown at Figure 4.
Figure 6 is a similar view to Figure 1 showing a modification of my improve-
ments.
Figure 7 is an inverted plan view of Figure 1.
Figure 8 is a similar view to Figure 7 showing the main spring unwound.
In carrying my invention into practice I form a recess in the centre of the
outside of the barrel B and into this recess I fit the notched disc b¹. I also cut
the dovetailed recess 62 on the outside of the barrel extending from the counter-
sunk portion in the centre to the edge and into this dovetailed recess I fit the
steel slide 63 so as to be capable of being moved freely therein, the inner end
of which is formed so as to fit into the notch formed in the disc and near the
outer end I fix the pin 65 or its equivalent which extends through the slot 66 formed
near the edge of the barrel, into the interior of the barrel, and between this pin.
and the inner side of the barrel rim I fix the spring d the loose end of which
bears against the pin so that when the main spring S is fully wound this spring d
presses against the pin and forces the slide 63 inwards until the end enters the
notch as shown at Figures 1 and 2 thus locking the spindle F which is
securely fixed into the square hole formed in the centre of the disc b¹ and thereby
preventing the main spring from being over wound which so frequently occurs,
but when the main spring is unwound the outer coil presses against the pin b
and forces the slide out of contact with the disc b¹ thus freeing the spindle until
wound up again.
In the method as shown at Figures 4 and 5 I form the dovetailed groove in
which the slide 63 works in the interior of the lid or cover H and in the centre
of this lid or cover I also form the counter sunk hole h¹. On the outer end of the
slide I form the projection h2 against which the spring a bears. When the
main spring is fully wound up the spring d¹ forces the slide inwards until the
inner end catches against the peg or projection h³ formed on the underside of
the barrel arbor h4, thus locking the spindle.
At Figures 6, 7 and 8 I have shown a modification of my invention. In this
case I dispense with the slide 63 and pivot the cam J to the barrel B. This cam
is provided with the pin which works in the curved slot and when the main
spring is fully wound up the spring d¹ forces this pin inwards thereby tilting
the cam until the projection enters the notch in the disc 61 thus locking the
spindle as clearly shown at Figure 6, but when the main spring is unwound the
outer coil bears against the pin j and forces it outwards as clearly shown at
Figure 8 thus releasing the spindle ready for re-winding the main spring. It
will be quite evident that the cam J may be placed in the interior of the barrel.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
CLAIMS.
First. In watch barrels a slide such as 63 working in a groove on the exterior
or interior of the barrel and operated by a spring such as d¹ fixed in the interior
of the barrel, a notched disc such as 6 in which the end of the slide enters and
locks the spindle in the manner and for the purpose substantially as hereinbefore
described and as shown upon the accompanying sheet of drawings by Figures 1,
2 and 3.
Second. In watch barrels a slide such as 63 working in a groove on the interior
of the barrel, lid or cover and operated by a spring such as d', a peg or projection
or notch formed on the barrel arbor for the end of the slide to catch against or

page_text: take into in the manner and for the purpose substantially as hereinbefore described
and as shown upon the accompanying sheet of drawings by Figures 4 and 5.
Third. In watch barrels a cam such as J pivotted to the exterior or interior of
the barrel and operated by a spring such as d', a notched disc such as b¹ in which
the projection on the cam enters and locks the spindle in the manner and for the
purpose substantially as hereinbefore described and as shown upon the accom-
panying sheet of drawings by Figures 6, 7 and 8.
Fourth. The improvements in watch barrels substantially as hereinbefore
described and as shown upon the accompanying sheet of drawings.
Datad thin 24th done of Aus 100%
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent for Applicant.