Year: 1888

page_text: Date of Application, 28th Jan., 1888
Complete Specification Left, 29th Oct., 1888
Complete Specification Accepted, 30th Nov., 1888
We, WILLIAM THOMAS SHAW, and ARTHUR SYDENHAM of 73, Chiswell Street,
in the City of London Engineers do hereby declare the nature of this invention to
be as follows:-
The instrument is driven by a worm fixed to the shaft whose revolutions are to be
counted, the worm may conveniently be formed upon a sleeve fixed to the shaft
The worm
and revolving in a collar supporting the case of the instrument.
gears with a worm wheel within the case, turning freely on a spindle fixed axially in
the case.
The worm wheel carries near its periphery a pin on which a pinion freely turns.
This pinion is in gear with two toothed wheels, placed side by side, one having one
more tooth than the other, the wheel next the worm wheel is koyed to the fixed spindle
and the other wheel is formed at the end of a sleeve turning freely on the fixed
spindle. The end of the sleeve carries a hand the end of which passes over the
divisions marked on a circle exhibited on the dial. This wheel the rotating wheel
also carries near its periphery a pin on which freely turns a pinion gearing in its
turn with two other toothed wheels placed side by side, one of which as before
has one less tooth than the other. The rotating wheel of the last pair is formed
on a sleeve turning on the before named sleeve and carrying at its further end a
second hand indicating on another circle of the dial face. The other wheel is fixed
to the case.
It will thus be seen that for each revolution of the shaft the worm wheel is advanced
one tooth, for each revolution of the worm wheel the rotating wheel of the first pair
is advanced one tooth and for each revolution of this latter wheel the rotating wheel
of the second pair is advanced one tooth.
+000
CARPMAEL & Co.,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Counters for Recording the Revolution of Wheels.
We, WILLIAM THOMAS SHAW and ARTHUR SYDENHAM of 73ª Chiswell Street,
in the City of London, Engineers, 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:-
The instrument is driven by a worm fixed to the shaft whose revolutions are to be
counted, the worm may conveniently be formed upon a sleeve fixed to the shaft
and revolving in a collar supporting the case of the instrument. The worm
gears with a worm wheel within the case, turning freely on a spindle fixed axially in
the case.
'
The worm wheel carries near its periphery a pin on which a pinion freely turns.
This pinion is in gear with two toothed wheels, placed side by side, one having one
more tooth than the other, the wheel next the worm wheel is keyed to the fixed
spindle and the other wheel is formed at the end of a sleeve turning freely on the
fixed spindle. The end of the sleeve carries a hand the end of which passes over
the divisions marked on a circle exhibited on the dial. This wheel the rotating wheel
also carries near its periphery a pin on which freely turns a pinion gearing in its turn
with two other toothed wheels placed side by side, one of which as before has one
less tooth than the other. The rotating wheel of the last pair is formed on a
sleeve turning on the before named sleeve and carrying at its further end a second
hand indicating on another circle of the dial face. The other wheel is fixed to
the case.
It will thus be seen that for each revolution of the shaft the worm wheel is advanced
one tooth, for each revolution of the worm wheel the rotating wheel of the first pair
is advanced one tooth and for each revolution of this latter wheel the rotating wheel
of the second pair is advanced one tooth.
In order that our said invention may be more fully understood and readily carried
into effect we will proceed to describe the drawings hereunto annexed.

page_text: preventing it from being carried round with the sleeve. The wheel b turns upon
a spindle g fixed centrally in the case. The pinion d is carried on the face of the
wheel b. It gears with two wheels e and f The wheel e is fixed to the axis g
and does not revolve. The wheel is mounted on a sleeve which is free to
revolve upon the spindle g. The other end of this sleeve has fixed to it a pointer
or hand. The wheel carries a pinion which gears with two wheels i and k.
The wheel is mounted upon a sleeve carrying a pointer or hand and is free to turn
upon the sleeve of the wheel f.
The wheel is fixed to the casing of the instrument.
The dial shown in Figure 2 is graduated to show the distance run by a velocipede.
Assuming that the diameter of the road wheel is 32 inches that the worm wheel 6 has
63 teeth, the wheel e 79, the wheel 80, the wheel 99 and the wheel 100, then
each revolution of the hand will represent eighty times sixty-three revolutions of
the road wheel, that is to say, a distance run of eight miles and each revolution of the
hand k represents a hundred times this, or eight hundred miles. These numbers are
merely given as an example. They may obviously be modified.
Figures 4 and 5 are vertical sections of a modified instrument involving the same
principle. As before the pinion d is carried on the face of the worm wheel b, but in
this instrument both the wheels e and (of which there are two pairs for the purpose
hereinafter described) are free to turn, and the pinion d in place of being free to turn
about its own asis as it is carried round by the worm wheel is prevented from doing
so by the vibrating arm pivotted at m which passes through it, transversely to its
axis. The parts ed and are shown separately in side elevation at Figure 6. The
motion is similar to the well known sun and planet motion. Each revolution of the
worm wheel produces a complete revolution of the wheels e and plus a part
revolution corresponding to the same number of the teeth of each of them as there
are teeth in the pinion d. In the example shown the wheels e have ninety-nine teeth,
the wheels a hundred, and the pinion d eleven, so that, for each revolution of the
worm wheel the wheels e turn through of a revolution, and the wheels, Hod of
a revolution, so that in nine hundred revolutions of the worm wheel b the wheels e will
have performed one complete revolution relatively to the wheels f. The hollow axis
of the wheel e on the right hand side as shown in Figure 4, carries a dial e¹ and the
axis of the wheel e on the left hand side carries a hand or pointer e². The axis of the
wheel f
on the right hand carries a band or pointer f¹ and the axis of the wheel on
the left side carries a dial 2. In this instrument the worm wheel has seventy teeth
and the dials are graduated for the road wheel of a velocipede thirty-two inches
in diameter. Each revolution therefore of the hand relatively to the dial e¹ or of
the hand e relatively to the dial 2 represents a hundred miles.
The axis of the right hand wheel has formed on it a pinion which gears with a
wheel (see Figures 4 and 7) mounted on the back of the dial e¹. The wheel n
has figures upon its face, which are visible through a slot in the dial so that the
number of hundreds of miles run are shown. The dial 2 is not provided with this
arrangement, but its hand, being connected to the driving spindle by a silent pawl
(see figure 6) and being driven by friction only, can be put forward and set to
zero without interfering with the internal mechanism so that each day's run can
be measured upon the dial ƒ whilst the dial e shows the total run of the
machine.
We would have it understood that we are aware counters have been made in
which a differential motion was obtained by means of a pinion gearing with two
wheels of equal diameters but having a different number of teeth. In such apparatus
however the centre line of axis of the pinion was fixed relatively to the axis of the
wheels and did not revolve about it as in our arrangements.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. A counter in which a differential motion is obtained by means of a pinion which

page_text: is carried round in a circle and which gears with two wheels of equal diameter but
having a different number of teeth substantially as described.
2. A counter in which the shaft whose revolutions are to be recorded actuates
a worm gearing with a worm wheel, which carries a pinion gearing with two
wheels of equal diameter but having a different number of teeth substantially as
described.
3. The counter substantially as described and shown in Figures 1 to 3.
4. The counter substantially as described and shown in Figures 4 to 8.
Dated this 29th day of October 1888.
WM. THOS. SHAW.
ARTHUR SYDENHAM