A Improved Construction of Main Spring for Watches, Clocks, Musical Boxes, and other Mechanism.
Year: 1886

page_text: Date of Application, 26th Mar., 1886
Complete Left, 24th Dec., 1886.
Complete Accepted, 28th Jan., 1887
A
Improved Construction of Main Spring for Watches, Clocks,
Musical Boxes, and other Mechanism.
We, CHARLES EDWARD JACOT, and EDOUARD BOVY, both of Chaux-de-fonds, in
Switzerland, do hereby declare the nature of this Invention, to be as follows :-
The object of our invention is to improve the working of the main spring in watches,
clocks, musical-boxes, and other mechanism, by freeing the same from prejudicial
friction and rendering it more flexible, freer, and less liable to break.
From the coiling or knotting of the winding of the spring there ensues a prejudicial
friction between the turns of the winding in proportion as the spring expands itself;
this defect is increased when it is endeavoured to obtain more than five or six turns in
the barrels in which the springs. are placed. Now, in order to guard against this
inconvenience, which is an impediment to the right working of any mechanism in
which the main spring must have a development superior to that just alluded to, we
reduce the breadth of the blade of the main spring in a progressive measure from the
outer to the inner end, in the ratio of about of its whole breadth, in order to render
the strength of traction of the same more uniform when the totality of the turns is not
completed and avoid the prejudicial friction resulting from the coiling or knotting in
of the main spring when completely wound up.
A spring thus shaped will act more freely, without any perceptible friction and
wear, and its traction will be more regular than that of an ordinary spring,
particularly in the first turns.
ERNEST DE PASS, Fel. Inst. P.A.,
68, Fleet Street, London,
Agent for the Applicants.

page_text: Musical Boxes, and other Mechanism.
We, CHARLES EDWARD JACOT, and EDOUARD BOVY, both of Chaux-de-Fonds, in
Switzerland, 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, reference being had to the accompanying drawings and to the
letters and figures marked thereon, that is to say :-
The object of our Invention is to improve the working of the main spring in watches,
clocks, musical boxes, and other mechanism, by freeing the same from prejudicial
friction and rendering it more flexible freer, and less liable to break.
From the coiling or knotting of the winding of the spring, there ensues a prejudi-
cial friction between the turns of the winding in proportion as the spring expands;
this defect is increased when it is endeavoured to obtain more than five or six turns in
the barrels in which the springs are placed.
Now, in order to guard against this inconvenience, which is an impediment to the
proper working of any mechanism, in which the main spring must have a develop-
ment superior to that just alluded to, we give to the spring the peculiar shape
represented at R¹ or R, in fig. 1, of the accompanying drawings, by reducing the
breadth of the blade, forming such spring, in a progressive measure, from its outer to
its inner end, in the ratio of about 3rd of its whole breadth. By this construction, we
render the strength of traction of the spring more uniform when the totality of the
turns is not completed, and avoid the prejudicial friction resulting from the coiling or
knotting of the main spring when completely wound up.
Fig. 2 shews a section, taken through a main spring R, formed in accordance with
our Invention, and fig. a plan shewing the spring wound up.
A spring thus constructed will act more freely, without any perceptible friction and
and its traction will be more regular than that of an ordinary spring,
particularly in the first turns.
wear,
Having now described our Invention and in what manner the same may be
performed we declare that we claim :
The construction of main spring for watches, clocks, musical boxes, and other
mechanism, in which the breadth of the blade forming such spring is reduced in a
progressive measure from its outer to its inner end, substantially as herein described
and shewn, and for the purposes set forth.
ERNEST DE PADS, Fel. mist. I.A.,
68, Fleet Street, London, E.C.,
Agent for the Applicants.