IMPROVEMENTS IN CALENDAR WATCHES
Year: 1877

page_text: LETTERS PATENT to Johann Anton Benedict von Castelberg, of 58, Holborn
Viaduct, in the City of London, for the Invention of "IMPROVEMENTS IN
CALENDAR WATCHES." A communication from abroad by Fritz Petitpierre, of
Chaux de Fonds, Switzerland.
Sealed the 6th October 1877, and dated the 23rd April 1877.
PROVISIONAL SPECIFICATION left by the said Johann Anton Benedict von
Castelberg at the Office of the Commissioners of Patents on the 23rd April
1877.
JOHANN ANTON BENEDICT VON CASTELBERG, of 58, Holborn Viaduct, in the
City of London. "IMPROVEMENTS IN CALENDAR WATCHES." A communication
from abroad by Fritz Petitpierre, of Chaux de Fonds, Switzerland.
This Invention has for its object to construct a cheap and efficient watch, which
shall not only exhibit the hours and minutes, but also the days of the week and
days of the month, and in addition to provide for setting the hands to the correct
position whenever necessary. For this purpose a pinion on the axis of the hour
hand of the watch is caused to gear with an intermediate wheel having twice as
many teeth as the pinion on the hour axis, so that it shall make one turn in twenty-
four hours, that is, one turn whilst the hour hand makes two. Standing out from
this wheel near its periphery are two pins; one on its upper side serves as to give a
step-by-step movement to a star wheel having seven teeth, and carrying a pointer
to indicate the days of the week, and the other pin on its under side serves to give
a step-by-step movement to a star wheel with thirty-one teeth, and which carries a
pointer to indicate the days of the month. The pins move each of these star wheels
one tooth at midnight.
The star wheels are situated on opposite sides of the intermediate wheel, so that
the dials on the face of the watch representing the week and month are at a distance
apart from one another.

page_text: Each star wheel has a tooth pressed against it by a spring. The tooth enters
somewhat between two of the teeth of the wheel, and offers sufficient resistence to
the turning of the wheel to keep it from shifting except when turned by the move-
ment of the watch.
A step-by-step movement can also be given to the star wheel carrying the pointer,
which indicates the day of the month by forcing a pawl or tooth against the inclined
teeth of the wheel; this pawl can be moved against the teeth of the wheel by a
pin, which passes out at one side of the watch case. Each time that the pin is
pressed inwards the pointer representing the days of the month is moved one day
forwards. The hand can thus be set correctly whenever it is necessary, either from
having neglected to wind up the watch, or from irregularity in the number of days
in the months.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Johann Anton Benedict von Castelberg in the Great Seal Patent Office
on the 23rd October 1877.
JOHANN ANTON BENEDICT VON CASTELBERG, of 58, Holborn Viaduct, in the
City of London. " IMPROVEMENTS IN CALENDAR WATCHES." A communication
from abroad by Fritz Petitpierre, of Chaux de Fonds, Switzerland,
This Invention has for its object to construct a cheap and efficient watch, which
shall not only exhibit the hours and minutes, but also the days of the week and
days of the month, and in addition to provide for setting the hands to the correct
position whenever necessary. For this purpose a pinion on the axis of the hour
hand of the watch is caused to gear with an intermediate wheel having twice as
many teeth as the pinion on the hour axis, so that it shall make one turn in 24
hours, that is, one turn whilst the hour hand makes two. Standing out from this
wheel near its periphery are two pins; one on its upper side serves to give a step-
by-step movement to a star wheel having 7 teeth, and carrying a pointer to indicate
the days of the week, and the other pin on its under side serves to give a step-by-
step movement to a star wheel with 31 teeth, and which carries a pointer to indicate
the days of the month. The pins move each of these star wheels one tooth at
midnight.
.
The star wheels are situated on opposite sides of the intermediate wheel, so that
the dials on the face of the watch representing the week and month are at a distance
apart from one another.
Each star wheel has a tooth pressed against it by a spring. The tooth enters
somewhat between two of the teeth of the wheel, and offers sufficient resistance to
the turning of the wheel to keep it from shifting, except when turned by the move-
ment of the watch.
A step-by-step movement can also be given to the star wheel carrying the pointer,
which indicates the day of the month by forcing a pawl or tooth against the inclined
teeth of the wheel. The pawl can be moved against the teeth of the wheel by a
pin, which passes out at one side of the watch case. Each time that the pin is
pressed inwards the pointer representing the days of the month is moved one day
forwards. The hand can thus be set correctly whenever it is necessary, either from
having neglected to wind up the watch or from irregularity in the number of days
in the months.
In order that the said Invention may be most fully understood, and readily
carried into effect, I have annexed to this Specification a Drawing to an enlarged
scale of a calendar watch constructed according to the Invention. The dial is
removed in order that the parts beneath it may be shown exposed, and only so

page_text: much of the works are shown as have to do with the Invention it is intended to
illustrate.
What I claim is, the construction of calendar watches, substantially as described.
In witness whereof, I, the said Johann Anton Benedict von Castelberg, have
hereunto set my hand and seal, this Twenty-second day of October, in the
of our Lord One thousand eight hundred and seventy-seven.
year
J. A. B. VON CASTELBERG. (LS.)