IMPROVEMENTS IN THE STRIKING WORK OF CLOCKS and
Year: 1885

page_text: I, URS VICTOR JAEGGI of Auburn in the Province of South Australia, Watch-
maker, do hereby declare the nature of my invention for "IMPROVEMENTS IN THE
STRIKING WORK OF CLOCKS and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement :—
"
My invention relates to improvements in the striking work of clocks whereby
they are so constructed as to sound the half hour or the quarter and half hours
on the same bell or gong or on separate bells or gongs provided for the purpose.
I attain these objects by the mechanism shewn in the accompanying drawing
the frames being drawn as if transparent in order to show the internal parts more
clearly.
Fig. I Shews my attachment to an ordinary American Clock whereby it is made
to strike the half hours with the same hammer and on the same gong or bell as
the hours.
Fig II My arrangement whereby the clock is made to strike the half hour with
a different hammer and on a different bell to the gong on which the hours are
sounded.
Fig III My improvement in clocks striking the half hour whereby they are
made to strike the quarters with a second hammer on a different bell and the half
hours with the second hammer in conjunction with the ordinary striking work; in
this case giving two sounds to the half hour.
Similar letters refer to similar parts in the several diagrams.
The simplest form of my invention is shewn in Fig I A is the frame of a one
or eight day clock. B the centre arbor to which the hands are attached and to
which the ordinary warning pin is fixed. C the hammer and E the gong or bell.
My improvement consists in fixing to the lower extremity of B through a hole
drilled for the purpose a pin turned upwards at its outer extremity and of such
suitable length as to raise a tail projecting for the purpose from near the lower end
of the arbor of the hammer C. The pin D should project at the opposite side to
the warning pin for the hour and should be so arranged as to allow the hammer to
drop as the minute hand passes the half hour. It will be easily understood that
clocks constructed with the pin D will strike the half hour independently of the
ordinary striking work and without any addition to the same."

page_text: Fig II Shews a further improvement having for its object a similar purpose
being a variation of my invention. A B C D and E are parts as before described
except that the lower tail of C is omitted. The frame A is prolonged so as to
carry the bushes in which work the pivots of a second hammer G. Underneath
the gong E is fixed a bell F. The hammer G is actuated by the pin D in the
manner before described, and strikes on the bell F. It thus gives a different sound
to that of the hours and tells clearly the hour and half hours between twelve and
two o'clock.
Fig III Shews the mechanism of my invention when applied to clocks con-
structed to strike the half hour in the ordinary manner. A as before is the upper
plate of the clock frame having a projecting part of' sufficient size to carry the two
hammers C and G. E is the gong. F is a bell fixed underneath E. H is a round
metal boss or plate fixed to the arbor B. In addition to the two pins usually
projecting forwards from H whereby the striking work is actuated, three pins are
fixed projecting backwards in such parts of. Has shall cause them to raise the
hammer G at the quarter half hour and three quarters. The hammers C and G are
bent into such shape as will retain the wire loop I in position at the same time
allowing it free play The loop I or its equivalent should be of such length as will
accomplish the purpose hereinafter described.
"
After striking the hour, as the arbor B moves round carrying with it the boss H,
the hammer G will be raised by one of the pins. As the minute hand passes the
first quarter it will be released and actuated by the spring provided for the
purpose will strike " one on the bell F. As the minute hand nears the half hour
one of the pins projecting forwards will release the striking work and allow the
clock to "warn in the usual manner; meanwhile another of the pins projecting
backwards will have raised the hammer G and by means of the loop I prevent the
hammer C from being released until G has dropped, as soon as this is done I again
hanging loose will allow C to be raised by the pin in the striking wheel and to
strike on the gong immediately after the bell. On coming to the three quarters G
only will strike the bell as in the first quarter.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
First The attachment to striking clocks of the pin D or its equivalent substan-
tially as herein described and for the purpose indicated.
Second The use of the same in combination with two hammers striking on
different bell or gong or bells or gongs substantially as described.
Third The construction of the boss H with three additional pins in combination
with two hammers C and G substantially as described.
Fourth The loop I or its equivalent in combination with the hammers C and G
and for the purpose indicated.
Dated this twenty sixth day of February 1885.