Improvements Watch Repeating Mechanism.
Year: 1897

page_text: Improvements Watch Repeating Mechanism.
I, MARTIN FISCHER, of Zeltweg 40, Zurich, Switzerland, Watchmaker, do hereby
declare the nature of this invention to be as follows:-
This invention has for object to cause the impact-nose of the hour-rack in
repeating-watches to strike always approximately at the centre of an hour-step
of the well known stepped snail without shooting forward the snails, as has
hitherto been usual, without loss of power of the clockwork, and without the
necessity of unpractical alterations of the ordinary dial-hand mechanism.
According thereto, the greater or less movement of the quarter-rack V upon
its stepped snail T ensures that the impact-nose F of the hour-rack in striking
always impinges upon the proper place on an hour-step-that is to say, never on
the edge or on the border between two steps.
Figs. 1 and 2 of the accompanying drawings represent repeating-mechanism
constructed according to this invention and applied to a striking-mechanism in
which both racks have the same axis of rotation.
screw
W is a bent lever pivoted on the plate so as to be capable of rotating about a
One arm of this lever carries two pins f at right angles to it, whilst
the other arm is clamped between the quarter-rack spring d and the quarter-
rack, so that the lever W will be compelled to follow all the movements of the
quarter-rack, which has the well known tendency, when disengaged, to impinge
with its impact-nose against the steps of the quarter-snail T.
On the hour-rack S there is arranged a movable lever F which forms an
impact-nose and is capable of rotating freely on the hour-rack about a screw t.
The lever F is adjusted by means of its prolongation by the pins f of the bent
lever W above referred to, in such a manner that in the arrangement shown,
the impact-nose of the lever F is compelled to share the opposite movement of
the pins f. 1' is the hour-snail; is the spring of the hour-rack; C is the
so-called quarter-tube-that is to say, the hollow axle upon which the quarter
snail T is mounted; D) is the change-wheel; and J is the hour-wheel on which
the hour-snail is mounted.
The mechanism operates as will now be described.
Fig. 1 shows the mechanism in a state of rest after striking, whilst Fig. 2
represents the parts after the striking-mechanism has been released.
The position of the snails shown in Fig. 1 indicates about one minute past
three o'clock. If, now, for example, the striking-mechanism be released in
this position, then, as can be seen from the drawing, the nose of the quarter-rack V
would move upon the commencement of the highest or o/4 step. In this case,
which is the one of least movement, the bent lever W (which is constantly kept
pressed up by the quarter-rack spring ), together with its pins f, executes also
the smallest rotary movement. The impact-nose F which moves subsequently
with the hour-rack S against P, rotates likewise to a small extent, and therefore
the said nose falls with the utmost certainty against the third step as shown in

page_text: Fig. 1, and the striking-mechanism strikes three times. But if, now, the minute-
hand is moved backwards to the extent of 1 or 2 minutes and the striking-
mechanism is released, then the position assumed is such as is shown in Fig. 2.
The quarter-rack falls upon its lowest step and the lever W by means of its
pins causes the extension of the lever F to shoot forwards in a downward 5
direction consequently the impact-nose of this lever to shoot upwards at the
same time so as to strike, at the subsequent fall, upon the second step of the
hour-snail. The striking-mechanism now strikes two hours and three quarters,
As
whereupon the racks and the levers re-assume the position shown in Fig. 1.
proved in the last case, this construction compels the striking-mechanism to strike 1
correctly even when the hands are moved backwards.
בד!
1
101
1007
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
I, MARTIN FISCHER, of Zeltweg 40, Zurich, Switzerland, Watchmaker, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
This invention has for object to cause the impact-nose of the hour-rack in
repeating-watches to strike always approximately at the centre of an hour-step
of the well known stepped snail without shooting forward the snails, as has
hitherto been usual, without loss of power of the clockwork, and without the
necessity of unpractical alterations of the ordinary dial-hand mechanism.
According thereto, the greater or less movement of the quarter-rack V upon
its stepped snail T ensures that the impact-nose F of the hour-rack in striking
always impinges upon the proper place on an hour-step-that is to say, never on
the edge or on the border between two steps.
Figs. 1 and 2 of the drawings filed with my Provisional Specification represents
repeating-mechanism constructed according to this invention and applied to a
striking-mechanism in which both racks have the same axis of rotation.
W is a bent lever pivoted on the plate so as to be capable of rotating about a
screw. One arm of this lever carries two pins f at right angles to it, whilst
the other arm is clamped between the quarter-rack spring and the quarter-
rack, so that the lever W will be compelled to follow all the movements of the
quarter-rack, which has the well known tendency, when disengaged, to impinge
with its impact-nose against the steps of the quarter-snail T.
On the hour-rack S there is arranged a movable lever F which forms an
impact-nose and is capable of rotating freely on the hour-rack about a screw t.
The lever F is adjusted by means of its prolongation 7 by the pins f of the bent
lever W above referred to in such a manner that in the arrangement shown,
the impact-nose of the lever F is compelled to share the opposite movement of
the pins f. P is the hour-snail; is the spring of the hour-rack; C is the
so-called quarter-tube-that is to say, the hollow axle upon which the quarter
snail T is mounted; D is the change-wheel; and J is the hour-wheel on which
the hour-snail is mounted.
The mechanism operates as will now be described.

page_text: represents the parts after the striking mechanism has been released.
The position of the snails shown in Fig. 1 indicates about one minute past
three o'clock. If, now, for example, the striking-mechanism be released in
this position, then, as can be seen from the drawing, the nose of the quarter-rack V
would move upon the commencement of the highest or o/4 step. In this case,
which is the one of least movement, the bent lever W (which is constantly kept
pressed up by the quarter-rack spring ) together with its pins f, executes also
the smallest rotary movement. The impact-nose F which moves subsequently
with the hour-rack S against P', rotates likewise to a small extent, and therefore
the said nose falls with the utmost certainty against the third step as shown in
Fig. 1, and the striking-mechanism strikes three times. But if, now, the minute-
hand is moved backwards to the extent of 1 or 2 minutes and the striking-
mechanism is released, then the position assumed is such as is shown in Fig. 2.
The quarter-rack falls upon its lowest step and the lever W by means of its
pins causes the extension of the lever F to shoot forwards in a downward
direction and, consequently the impact-nose of this lever to shoot upwards at the
same time so as to strike, at the subsequent fall, upon the second step of the
hour-snail. The striking-mechanism now strikes two hours and three quarters,
whereupon the racks and the levers re-assume the position shown in Fig. 1.
proved in the last case, this construction compels the striking-mechanism to strike
correctly even when the hands are turned backwards.
As
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is:
-
1. Watch repeating-mechanism in which the impact-nose of the hour-rack S
is freely connected with the latter and is under the influence of the fraction-rack
so that at striking it will be placed so as to accord exactly with the extent of fall
of the last-mentioned rack, substantially as described.
2. Watch repeating-mechanism of the kind referred to in the preceding claim,
in which the hour-rack S is provided with an impact-nose F movably jointed
thereto and acted upon by a bent lever W influenced in its turn as regards its
position by the position of the fraction-rack V, and in which the hour-rack S
with the impact-nose F, and the friction-rack V, are pressed by springs against
the hour-snail 1' and the fraction-snail T respectively substantially as described.
3. Watch repeating-mechanism constructed, arranged, and operating substan-
tially as herein before described with reference to and shown in the drawings
referred to.
Dated this on day oug
F. WISE HOWORTH,
46 Lincoln's Inn Fields, London, W.C., Agent for the Applicant.