Improvements in Counters for Recording the Revolutions of Wheels or Shafts.
Year: 1889

page_text: Date of Application, 11th Oct., 1889-Accepted, 16th Nov., 1889
COMPLETE SPECIFICATION.
Improvements in Counters for Recording the Revolutions of Wheels
or Shafts.
We WILLIAM THOMAS SHAW and ARTHUR SYDENHAM Director and Manager of
the Crypto Cycle Co. Limited of 64 City Road, London E.C. do hereby declare the
nature of this invention and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement :-
Our invention has for its object the counting and indicating of the revolutions of
Wheels or Shafts by improved means and in a manner specially adapted for use in
connection with high-speed engines or machines such as are now commonly used.
The construction of our improved counter will be readily understood by referring to
the accompanying drawings.
Fig. I is a front view of the instrument, showing Dial f with four concentric
circles severally indicating "Units and Tens," "Hundreds," "Thousands" and "Ten
thousands," each circle divided into 100 parts, and provided with its appropriate hand
by means of which any number may be indicated, from unity up to 100,000,000.
Fig. 1 also shows front view of a hollow bracket with projecting suspension lugs,
through which runs a spindle a upon which is formed an endless screw
or worm.
is a rotating spindle carrying the hand 2 as described hereafter. The four hands
severally bear the same letter as the moving parts inside by which they are carried
round.
Fig. II is a vertical section of the instrument. is the case, with bracket and
suspension lugs, carrying the spindle a on which is formed a worm shown at a¹ in
Fig. I. The projecting end of the spindle a is fitted with a toothed pulley, spur wheel,
or other similar device, enabling it to receive motion from the shaft or wheel, the
revolutions of which it is desired to record. The remaining portions forming one
piece with the case are as follows. "fixed plate; 2, fixed wheel with 99 teeth;
fixed plate; f* fixed wheel with 99 teeth; f, dial; f6, fixed wheel with 99 teeth;
f, bizzle and glass in front of dial. The moving parts are as under; a³, worm;
b. worm-wheel fixed to spindle &, carrying hand 62 for " units and tens;" the worm-
wheel 6 is armed with 100 teeth and therefore makes one complete revolution, with its
hand 2 for 100 revolutions of the worm a. b carries a stud 63, on which revolves a
broad pinion gearing with the fixed wheel 2 and an equal wheel c bearing 100
teeth. c is fixed to a sleeve c¹ which is continued forward to the dial-face, and there
carries the hand 2 for "Hundreds." The sleeve c¹ is constructed with an arm
which in its turn carries a stud c³ on which revolves a broad pinion ct. This
pinion gears into the fixed wheel and also into an equal wheel d bearing 100
teeth. The wheel d is fixed to a sleeve d' which is continued forward to the dial-
face and there carries a hand d2 for the "Thousands." The sleeve d' is constructed
with an arm, carrying a stud d³ on which revolves a broad pinion d.
This pinion
gears into the fixed wheelf and an equal wheel e bearing 100 teeth. The wheel e is
constructed with a sleeve continued through to the dial face, and there carries a
hande for the "Ten thousands circle. 9. g. are distance-pieces inserted to give
strength and rigidity to the construction. The action of the mechanism above-
described is as follows. Assuming that the spindle a makes the same number of
revolutions as the shaft or wheel to be indicated it follows (as already
explained) that b will make Tooth part of that number of revolutions and
that for 100 revolutions of a the wheel b with its hand 62 will in the same
time make one circuit of the dial. The action of the broad pinions, rolling
round their respective pairs of wheels, equal but differing by a tooth, is that
for each completed revolution of the studs around the centres of the wheels, the free
wheel of the pair (the other being fixed) is advanced one tooth, i.e. both part of a

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revolution. The combined effect of the train is therefore as follows; 1 revolution
of e100 revolutions of d; 1 revolution of d 100 revolutions of c; 1 revolution
of c = 100 revolutions of b; and as we have already seen, 1 revolution of b = 100
revolutions of shaft or engine. Seeing that 100 x 10 x 100 x 100 = 100,000,000
it results that 100,000,000 revolutions of the shaft will be required in order to
procure a single revolution of the hand e².
An inspection of the dial-face at
Fig. I will show that by our arrangement of the circles concentrically
according to the decimal notation, each indicated by a hand connected up with
the train of wheels at its appropriate position, the whole of the revolutions mado,
from unity to one hundred millions, are recorded and exhibited at one view.
will be observed, also, that by noting the movement of the longest hand from
zero onward during a minute of time, with the aid of a stop-watch, the instru-
ment may be used as a very exact speed-indicator. When it is desired to adopt
1,000,000 as the maximum record, the hand e², with its relative circle, and the
connected parts within the case are omitted.
It
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we wish it to be under-
stood that we do not claim the particular method of driving the internal parts
herein shown, which was described by us in our patent of 1888 No. 1349, but
what we claim is
The general construction and arrangement of the various parts in the manner
and for the purposes substantially as described and set forth herein.
Dated this 4th day of October 1889.
WM. THOS. SHAW.
ARTHUR SYDENHAM.