IMPROVEMENTS IN STOP WATCHES
Year: 1882

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex for
an Invention of IMPROVEMENTS IN STOP WATCHES A communication to him
from abroad by Ovide Ferdinand Domon of Belfort, France
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at
the Office of the Commissioners of Patents on the 23rd September 1882.
HERBERT JOHN HADDAN, of Kensington, Middlesex,
« IMPROVEMENTS IN STOP
WATCHES," a communication to me from abroad by Ovide Ferdinand Domon of
Belfort, France,
The improvements relate to a special mechanism applicable to watch movements
independently of the watch movement proper, and not requiring increase in size of
watch. They consist of a detent made with inclined surfaces and stops, combined
with a movable impinging lever and forked springs fitted with regulating screws
worked by a single train actuating a separate pinion in the centre controlled by a
light brake or drag spring-Two cones work the stop hand and allow of stopping
and putting in movement-The various parts are made of metal.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Herbert John Haddan in the Great Seal Patent Office on the
22nd March 1883.
HERBERT JOHN HADDAN, of Kensington, Middlesex, "IMPROVEMENTS IN STOP
WATCHES," a communication to me from abroad by Ovide Ferdinand Domon, of
Belfort, France,
This invention relates to a special mechanism applicable to watches inde-
pendently of the watch movement proper, and not requiring increase in the size of
the watch.
The chronograph or stop watch represented in the accompanying drawings and
hereinafter described has the following peculiar features:
1. Complete independence of the chronograph or stop mechanism from the rest
of the mechanism so as to allow its application to a Lepine watch with or without
secrets as well as to hunting watches and not to require a special size of watch;
thereby offering great facilities in the construction and principally for repairing.
2. The use of a snail having two inclines and three stops and which owing to its
fine and precise working is far less subject to wear than the mechanism of systems
hitherto known.
3. A forked spring provided with a regulating screw.
4. Replacing the intermediate transmitting gear with special teeth by a single
gear wheel with ordinary teeth actuating a loose centre pinion, the back lash or loss
of time of which is neutralized by means of a light brake-spring.
5. The application of a pair of polished friction cones adapted to drive the
seconds hand (the chronograph hand) which may be instantaneously stopped or set
in motion by setting the friction cones in or out of contact with each other.
In the accompanying drawing the following parts belong to the ordinary
mechanism:
a represents the pendant of the stem-winder provided with a pinion.
6 the pusher for setting the hands.
c the crown wheel of the winding apparatus.
d the bridge for the centre wheel.
e the centre wheel and its pinion.
f. the third wheel and its pinion.
g the bridge supporting plate.
h the bridge of the spring box.
The following parts belong to the stop mechanism.
a represents the pusher.
6 the large spring of the pusher.
c¹ the spring pallet.
d the ratchet wheel with 9 teeth.
e¹ the bevelled snail with 3 cams having 2 inclines and 3 stops and actuated
by the pin of the ratchet-wheel, as shown.
f¹ stud or pivot for the snail and ratchet-wheel.
g the spring-pallet.
h¹ the large lever set in motion by the snail and actuating the forked spring and
the heart-cam.
i small nose of the large lever, which nose can be adjusted for the purpose of
regulation and for the compensation of wear.
k forked spring causing the release of the friction cones.
7 Set screw for putting the forked spring at rest.
m large bridge made of steel or nickel.
n bolt or fastening spring causing the adhesion of the friction cones after the
release of the forked spring.
o. Spring of the large lever.
pp Heart cam returned to its starting point (midday).

page_text: q Friction cone of the arbor set in motion by the contact with the cone of the
transmitting pinion.
Arbor actuating the chronograph hand.
8 cap or sleeve mounted on the arbor and fitting into the forked spring.
t. Transmitting pinion provided with a polished friction cone, and 16 teeth, and
without back-lash or loss of time, owing to the effect of the brake-spring.
u Bearing or guide-plate fixed by three screws and in which pivots the trans-
mitting pinion. This bearing may be omitted by arranging the transmitting pinion
so as to pivot on on the prolongation of the pinion of the centre-wheel
v transmission wheel fixed on the pivot of the third wheel
CLAIMS.
1. The construction and combination of parts constituting the chronograph-
movement, substantially as described and illustrated.
2 A chronograph or stop-watch having the features of construction indicated at
the beginning of the specification by No. 2, 3, 4 and 5, substantially as described.
In Witness whereof I, the said Herbert John Haddan have hereunto set my
hand and seal this 22nd day of March A D 1883.
TT T TLADDIN