Improvements in Watches.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Watches.
I, HULDA GRÜNBERG, of Biel in the Republic of 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 :-
This invention relates to watches provided with calendar mechanism that is
which are arranged to show the number of the day of the month and the name of
the day of the week and has for its object to provide improved means whereby the
calendar mechanism can be readily set to the correct number and name.
As is usual the number and name discs carrying respectively the numbers 1 to 31
and the names of the seven days of the week are operated by two wheels adapted
to rotate about the same axis, one wheel having thirty-one teeth and being con-
nected to the number disc and the other wheel having seven teeth and being
connected to the name disc. Each of these wheels is rotated through one tooth
every twenty four hours in the usual manner.
As the so-called number disc and wheel are only arranged for a month of thirty-
one days it is necessary that for short months after the number of the last day the
number shall appear for the first day of the following month, the number 31 and
and in February the numbers 29, 30 and 31 being passed over. It is furthermore
necessary that the calendar mechanism may in consequence of the watch stopping
or keeping incorrect time, be at any time set to the actual date and that the number
and name of the day may be brought to agree.
Now according to this invention the setting or adjustment of the number and
name discs is effected by the regulator c provided with four arms; one arm extends
to the outside of the watch case through a small slot in the case and serves to
operate the regulator; another arm c³ forms a spring firmly held at its free end
between two stops and tends to force the regulator to its neutral or central
position; a third arm c¹ is adapted when the operating arm is moved to the left to
engage with a tooth of the number wheel a and rotate it through one tooth, and
when the operating arm of the regulator is released the regulator is returned by
the spring arm to its normal position out of gear with the wheel a and can be
again operated if desired to move the wheel a forward another tooth and so on ;
the fourth arm & acts in a similar manner on the name wheel b to move it back-
wards when the operating arm of the regulator is moved to the right. Normally
the wheels a and b are free to rotate without touching the arms c c. The
wheels a and b are prevented from moving more than one tooth at a time and are
brought to the exact position by the spring pawls d' and f¹ respectively.
It will thus be seen if the regulator c is moved on the outside to the left, the
arm c¹ engages in the number wheel a and rotates it one tooth forwards when it is
brought again into the neutral position by the spring c whilst if the regulator c
is moved to the right the arm engages in the name wheel b and rotates it
backwards the space of one tooth when it is brought again into the neutral position

page_text: by the spring and both manipulations can be repeated until the appearance of the
desired date.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
A regulator for calendar mechanisms of watches provided with an external
operating arm, with a spring arm always tending to force it to its central or neutral
position and with two pawl arms, one adapted when the operating arm is moved in
one direction to rotate the number wheel and the other adapted when the operating
arm is moved in the other direction to rotate the name wheel in each case the space
of one tooth from the position previously occupied the whole substantially as
described for the purpose specified.
Dated this 16th day of February 1893.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.