IMPROVEMENTS IN THE ARRANGEMENT OF DIALS AND DIAL WORK FOR WATCHES AND CLOCKS
Year: 1884

page_text: .PROVISIONAL SPECIFICATION.
JAMES KENDAL of 106 Cheapside in the City of London Watch and Clock
Manufacturer and MARC LAVAL of 110 Cannon Street in the City of London
Commission Agent do hereby declare the nature of an invention for IMPROVEMENTS
IN THE ARRANGEMENT OF DIALS AND DIAL WORK FOR WATCHES AND CLOCKS to
be as follows:-
An arrangement by which the hands on each of two dials on opposite sides of a
watch are worked by a single centre wheel but turn in the same direction—the hour
hand on the 12 hours dial making two revolutions to every one revolution of the
other. The same direction of the hands is obtained by an extra wheel connected
with the centre wheel on one side.-The double revolution on one dial is obtained
by doubling the hour wheel and minute pinion on the 24 hours side.
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page_text: We JAMES KENDAL of 106 Cheapside in the City of London Watch and Clock
Manufacturer and MARC LAVAL of 110 Cannon Street in the City of London
Commission Agent do hereby declare the nature of an invention for IMPROVEMENTS
IN THE ARRANGEMENT OF DIALS AND DIAL WORK FOR WATCHES AND CLOCKS and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The watch or clock has two dials placed back to back with the movement between
them. One of these dials has the hour circle divided into twelve which the hour
hand traverses once in twelve hours in the usual way. The hour circle of the other
dial is divided into twenty four and the hour band of this dial makes one revolution
in twenty four hours.
For actuating the hands on the twenty four hour dial there is a small inter-
'mediate staff running right through the movement and carrying a wheel which
gears with and is driven by the barrel teeth. The minute wheel and minute wheel
nut are fixed on one extremity of this staff. The canon pinion for the twenty-four
'hour hands runs quite freely on a prolongation of the centre pinion which said
prolongation merely acts the part of a stud as the canon pinion is driven by the
minute wheel and the hour wheel is driven by the minute wheel nut. By this
arrangement the canon pinion is caused to rotate in a contrary direction to that of
the centre pinion so that the figures on the twenty-four hour dial run in the same
direction as those on the twelve hour dial. For setting the hands of the watch
there are two push pieces projecting through the band of the case one on each side
of the pendant. Looking at the watch or clock from the twelve hour dial under
which dial the set hands mechanism is placed the right hand push piece connects
the winding stem with the twelve hour motion work and the left hand push piece
connects it with the twenty-four hour motion work. The motion work of the
twelve hour dial is normally in connection with an idle wheel on a stud in the plate
and through this wheel with two smaller ones carried on the longer end of a rocking
bar When the right hand push is depressed the upper or ratchet teeth of the usual
shifting sleeve are disconnected from the winding wheel and the lower teeth of the
shifting sleeve are brought into contact with the set hand wheel in the ordinary
way. The same action of the shifting sleeve takes place when the left hand push
piece is depressed but the rocking bar is tilted in addition so that the intermediate
wheel on the longer end of it is released from connection with the twelve hour
motion work while at the same time a small wheel on the shorter end of the
rocking bar is pushed into gear with a wheel mounted at the extremity of the
intermediate axis the other end of which carries the twenty-four hour minute
wheel as before mentioned. It is optional to have for the sake of economy_or
otherwise only one (the ordinary) setting of the hands for the two systems. For
regulating the watch there is a toothed segment on the tail of the index. The
arbor of a pinion gearing with this segment comes through the twenty four hour
dial and carries an index which may be moved round a graduated scale on the dial

page_text: so placed as to correspond with the seconds piece on the other dial Both dials
have rims to fit over the movement. The accompanying drawings indicate the
movements above described Figure 1 is a view of the set hands mechanisin under
the twelve hour dial (A) wheel for 24 hour hands (B) pinion for same. Figure 2
is a view (under the 24 hour dial) showing (C) pitch circle of barrel teeth (D) pitch
circle of wheel on intermediate staff and (E) minute wheel for the 24 hour dial.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
1. That the two systems of 12 and 24 hours are indicated on opposite sides of
one watch or clock.
2. That the two systems are worked by one motive power and on the same
centre.