An Improved Motion Work especially applicable to Watches and Clocks.
Year: 1892

page_text: Date of Application, 24th Oct., 1892
Complete Specification Left, 24th July, 1893-Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
An Improved Motion Work especially applicable to Watches and
Clocks.
1, BENJAMIN WILLIAM WARWICK of 134 Highbury Hill, London, N.
Engineer do hereby declare the nature of this invention to be as follows:-
This improvement consists essentially in applying a reducing differential con-
centric gear motion on the required axle of a watch or clock or other machine
in place of the at present universally employed reducing motion-work, consisting
of two wheels and two pinions, reducing the velocity to one-twelfth for the hours
or other ratio as required. In this improvement the revolving axle, the motion
from which is to be reduced, is made to carry a cross arm which carries a wheel
or pinion or tumbler of any number of teeth of the right size to gear with a
fixed wheel or circle of upright lantern teeth on the frame of clock or other
machine.
The wheel or pinion carried by the arm being free to move on its own axis and
being in gear with the fixed teeth constitutes a sun-and-planet motion. -Sleeved
on the centre axle and resting on the cross arm is a wheel having in its simplest
terms either one tooth more or less to give the differential motion in the right
direction as required. This slowly moved differentially moved wheel also gears
with the planet wheel or pinion and as the latter moves is continually revolved
forwards or backwards as required, its motion being equal only to the difference
between the teeth on slowly revolving wheel and the number of teeth in fixed
wheel.
The object of the improvement is to simplify and cheapen production. It also
allows, where wanted, the slowly moving wheel and hand to occupy wholly the
central space on a dial, the quicker moving indicators being carried outside at the
same time on the cross arm referred to.
This out 1
Ր
1000
W. H. MUNNS,
Agent for Applicant.
COMPLETE SPECIFICATION.
An Improved Motion Work especially applicable to Watches and
Clocks.
BENJAMIN WILLIAM WARWICK, of 134 Highbury Hill, London, N.,
Engineer, 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 improvement consists essentially in applying a reducing differential con-
centric gear motion on the required axle of a watch or clock or other machine in
place of the at present universally employed reducing motion work, consisting of
two wheels and two pinions, reducing the velocity to one-twelfth for the hours or
other ratio as required. In this improvement the revolving axle, the motion from
which is to be reduced, is made to carry a cross arm which carries a wheel or
pinion or tumbler of any number of teeth of the right size to gear with a fixed
wheel or circle of upright lantern teeth on the frame of clock or other machine.
The wheel or pinion carried by the arm being free to move on its own axis, and
being in gear with the fixed teeth, a sun and planet motion is constituted.
Sleeved on the centre axle and resting on the cross arm is a wheel having in its

page_text: simplest terms one tooth more or less than the fixed wheel to give the differential
motion in the required direction. This differentially moved wheel also gears with
the planet wheel or pinion, and, as the latter moves, is continually revolved forwards
or backwards as arranged, its motion being equal only to the difference between
the number of teeth on it and the number on fixed wheel.
The object of the improvement is to simplify and cheapen production.
It also allows the slowly moving wheel and hand to occupy wholly the central
space on a dial, the more quickly moving indicator being carried outside on the
cross arm.
To show clearly how my invention may be carried out furnish drawings but I
do not limit myself to the methods herein described and shown.
Fig. 1 shows in elevation my invention applied to clocks.
A is frame. B is set-bands. C is the hour or centre wheel fitted to and turning
with axle M which carries the minutelhand N. Dis toothed: wheel fixed to frame.
E is carrier attached to and revolving with. axle M and also supporting pinion F
which gears at bottom with fixed wheel D and above with differential wheel G.
This wheel Gis sleeved on to axle. M, and the sleeve H carries theihour hand J.
The wheel Ghas one tooth more than wheel 'D, or the teeth on wheels Grand D
are in the ratio of 12 to: 11. Therefore every complete revolution of opinion. F
round the axle M causes the wheel to move forward one-twelfth of its
icircumference.
Fig. 2 shows intelevation and partly in section an arrangement of my invention
Jin which the disk carrying the hour hand or other slowly moving indicator
1occupies the centre of the dial on face; and the minute hand or quickly moving
indicator is on the same plane as the hour hand.
In this case the minute-hand .N is carried on the carrier E, and the differentially
emoved wheel Gicarries the hour hand J.
Having now particularly described and ascertained the nature of my said inven-
Lion, and in what manner the same is. to be performed, I declare that what I
claim.is:
1. A differential concentric gear motion on a revolving axletconsisting of a:fixed
toothed wheel, a revolving arm carrying a freely revolving pinion, whicht pinion
gears with the fixed wheel and also with ardifferential wheel applied to timepieces
substantially as described and shown in Fig. 1.
2.The invention.adapted to bring the indicators carried by the motion work to
revolve in the same plane, and the slowly moving hand to occupy wholly the
central space on a dial or face to enable impressions to be made.
3. The apparatus substantially as described and shown in Fig. 2.
1
ד
W. H. MUNNS,
Agent for Applicant.