AN IMPROVED CHRONOGRAPH
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Augusto Goy Golay at the
Office of the Commissioners of Patents on the 2nd January 1883.
AUGUSTE GOY GOLAY of Brassus Switzerland "AN IMPROVED CHRONOGRAPH "
The object of my invention is to obtain the utmost precision in starting and
stopping the hands of a chronograph when the push piece is acted upon to start or
stop them.
I obtain this result by means of a particular arrangement of the brake of the
chronograph hand also by arranging in a special manner the intermediate wheel
which transmits the motion of the larger hand to that of the minute indicator.
The dial has besides the usual divisions of hours minutes and seconds a circle
with 300 divisions for the larger hand of the chronograph This latter passes by
preference under the hour and minute hands. On a small dial having 60 divisions
symmetrically arranged with that of the seconds is placed the hand of the minute
indicator which advances one division at every turn of the larger hand of the
chronograph.
The return of the latter as well as that of the hand of the minute indicator
takes place from left to right or from right to left according as the stopping has
been effected before or after the division VI of the large dial or 30 minutes of the
smaller ono
A brake which bears against the barrel of the hand of the chronograph during
its progress carries a small spring which bears upon the top of a pin fixed to a
lever this lever carries the intermediate wheel which transmits the motion by
means of another wheel to the centre wheel. The said spring is arranged in such
a manner that when the aforesaid lever is lifted by a ratchet it throws the inter-
mediate wheel out of gear with the centre wheel this motion at the same time
increasing the tension of the said spring and consequently the pressure of the
brake upon the barrel of the hand of the chronograph

page_text: The minute indicator consists of a wheel having 60 teeth acted upon by a very
weak jumper carrying an eccentric which receives the impulse of a lever to bring
back the hand of the indicator to 0. This lever is lifted by another lever acting
on an eccentric of the chronograph and is itself brought into action by suitable
means
5
With the indicator wheel a smaller wheel engages which is carried upon a
moveable piece secured by a spring. This piece is brought into action by the lever
which carries the intermediate wheel of the chronograph so that when the
chronograph is going a wheel suitably placed approaches the centro wheel of the
chronograph to enable a small pin fixed upon the latter to pass over one tooth of 1
the indicator wheel after each turn of the large hand

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Auguste Goy Golay in the Great Seal Patent Office on the 2nd July
1883.
כי
AUGUSTE GOY GOLAY of Brassus Switzerland AN IMPROVED CHRONOGRAPH
The object of my Invention is to obtain the utmost precision in starting and
stopping the hands of a chronograph when the push piece is acted upon to start or
stop them
I obtain this result by means of a particular arrangement of the brake of the
chronograph hand by arranging in a special manner the intermediate wheel which
transmits the motion of the larger hand to that of the minute indicator.
The dial has besides the usual divisions of hours minutes and seconds a circle
with 300 divisions for the larger hand of the chronograph. This latter passes by
preference under the hour and minute hands. On a small dial having 60 divisions
symmetrically arranged with that of the seconds is placed the hand of the minute
indicator which advances one division at every turn of the larger hand of the
chronograph. The return of the latter as well as that of the hand of the minute
indicator takes place from left to right or from right to left according as the
stopping has been effected before or after the division VI of the large dial or
30 minutes of the smaller one. A brake which bears against the barrel of the
hand of the chronograph during its progress carries a small spring which bears
upon the top of a pin fixed to a lever this lever carries the intermediate wheel
which transmits the motion by means of another wheel to the centre wheel. The
said spring is arranged in such a manner that when the aforesaid lever is lifted by
a ratchet it throws the intermediate wheel out of gear with the centre wheel this
motion at the same time increasing the tension of the said spring and consequently
the pressure of the brake upon the barrel of the hand of chronograph. The
minute indicator consists of a wheel having 60 teeth acted upon by a very weak
jumper carrying an eccentric which receives the impulse of a lever to bring back
the hand of the indicator to o. This lever is lifted by another lever acting on an
eccentric of the chronograph and is itself brought into action by suitable means.
With the indicator wheel a smaller wheel engages which is carried upon a move-
able pieco secured by a spring. This piece is brought into action by the lever
which carries the intermediate wheel of the chronograph so that when the
chronograph is going a wheel suitably placed approaches the centre wheel of the
chronograph to enable a small pin fixed upon the latter to pass over one tooth of
the indicator wheel after each turn of the large hand. And in order to explain
my said invention more fully 1 will now proceed to describe the same with
reference to the accompanying sheet of drawing
DESCRIPTION OF THE DRAWING

page_text: Figs 5 and 6 represent a modification of the brake A which enables me to
dispense with the wheel H by substituting the indicating wheel C by the ratchet
wheel C¹
In all the figures the same letters refer to the same parts. As shown in fig 4 the
dial has besides the usual divisions of hours minutes and seconds a circle with 300
divisions for the larger hand of the chronograph. This latter passes by preference
under the hour and minute hands. On a small dial having 60 divisions symmetri-
cally arranged with that of the seconds is placed the hand of the minute indicator
which advances one division at every turn of the larger hand of the chronograph.
The return of the latter as well as that of the hand of the minute indicator takes
place from left to right or vice versa according as the stopping has been effected
before or after the division VI of the large dial or 30 minutes of the smaller one.
A brake A which leans against the barrel of the hand of the chronograph during
its progress carries a small spring a which bears against a pin x fixed to a lever B
this lever B carries the intermediate wheel L which transmits the motion of the
wheel M to the centre wheel K. The spring a is arranged in such a manner that
when the lever B is lifted by a ratchet wheel R it throws the intermediate wheel L
out of gear with the centre wheel K this action at the same time increasing the
tension of the spring a (fig 2) and consequently the pressure of the brake A upon
the barrel of the hand of the chronograph. The minute indicator consists of a
wheel C having 60 teeth acted upon by a very weak jumper D carrying an
eccentric E which receives the impulse of a lever F to bring back the hand of the
indicator to o. This lover is lifted by the arm or lever G acting on the eccentric N
of the chronograph and is itself brought into action by a spring ƒ which presses it
against the screw y fixed upon the lever G
With the indicator wheel C a smaller wheel engages which is carried upon a
moveable piece J secured by a spring i. The piece J is brought into action by the
lever B which carries the intermediate wheel L of the chronograph so that when
the chronograph is going the wheel H approaches the centre wheel K of the chrono-
graph to enable the small pink fixed upon the latter to pass over one tooth
of the indicator wheel C by means. of the wheel H after each turn of the large
hand.
In freeing the chronograph the lever B acts upon the piece J which carries the
wheel H and the latter goes sufficiently far from the centre wheel K to be out of
reach of the pin k.
In fig 5 the chronograph is supposed to be going while Fig 6 shews the position
of the different parts after the hands of the chronograph and indicator have
returned to 0 i.e. while stopping.
In order to further ensure the action of the brake A' which checks the hands of
the chronograph the barrel of this latter carries a disco provided with a tooth o'
with which the pawl a' of the lever A' engages when the hand of the chronograph
passes 0. (marked 60 on the dial) this tooth absolutely prevents the reverse
movement of the large hand.
At the same time I utilise the movement produced by the fall of the pawl 2'
when engaging with tooth o' and cause au advance of one tooth (say one
division on the dial) of the ratchet wheel C, which carries the hand of the
indicator.
This I effect very simply by pivotting at the end of the lever A¹n pawl. _P' (kept
in position by a small spring q) to engage in the teeth of the wheel C'. The lever
G'acts in advance of the lever G to bring the large hand of the chronograph back
to 0 by pressing against the heart shaped piece N. The lever F. which actuates
the heart piece E of the indicator hand presses likewise in advance against the
lever G which it rises when the chronograph is set going. The lever Gl. is
furnished with a pin p which disengages the pawl P. when put back to o so as to
leave the wheel C₁, at liberty to turn either in one direction or the other.

page_text: Having thus described the nature and object of my Invention I would remark in
conclusion that what I claim as my Invention is
Firstly the brake A with spring a arranged in such a manner that when the
chronograph is stopped by lifting the lever B there is a an increase of tension on the
spring a which causes the brake A to act instantaneously. Secondly.-the piece J
arranged in such a manner as to be lifted by the lever B when the chronograph is
stopped in order to put the intermediate wheel H out of reach of the pin k
Thirdly-the arrangement of the levers F. and G. which bring back the hands of
the chronograph and indicator to o in either direction
Fourthly the modification of brake arrangement shewn at Figs 5 and 6
Fifthly a chronograph constructed substantially as set forth
In Witness whereof I the said Auguste Goy Golay have hereunto set my
hand and seal this twenty sixth day of June in the year of our Lord
one thousand eight hundred and eighty three.