Improvements in or relating to Apparatus for Counting the Revolutions of Axles and the like.
Year: 1895

page_text: Date of Application, 4th Dec., 1895
Complete Specification Left, 4th Sept., 1896-Accepted, 4th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Apparatus for Counting the
Revolutions of Axles and the like.
We, ALBERT WALTER GAMAGE, Outfitter of 126 Holborn and GEORGE ALBERT
BOLTON Mechanical Engineer of 118 Holborn both in the City of London, do hereby
declare the nature of our said invention to be as follows:-
This invention relates to improvements in or applicable to apparatus for counting
revolutions of axles and the like, such as cyclometers, tachometers and similar
mechanisms.
In such apparatus it has heretofore been difficult to set the hands to zero and still
more difficult to adjust the apparatus for axles, wheels, or the like of different
diameter.
This invention is intended to overcome these difficulties and is carried into effect as
follows:
In cyclometers and the like the motion of the axle or wheel the speed of which is to
be measured, or the number of whose revolutions is to be ascertained, is transmitted
by suitable means to a pinion within the casing enclosing the works and thence
directly to the counting train. In setting the hands all the parts have to be moved
back as far as they were previously advanced and for the purpose of adapting the
whole to various spindles both the actuating pinion and the first wheel of the counting
train have to be exchanged.
According to this invention we interpose a pinion between the actuating pinion and
the first wheel herein above mentioned. This new pinion is so mounted on a movable
axle that it can be slipped along the periphery of the actuating pinion. Outside the
casing a stud or button is provided for operating the shifting pinion.
When the hands are to be set the shifting pinion is moved until it leaves the first
wheel of the train, being brought into position again to connect the first wheel and
actuating pinion when the hands have been set.
To adapt the apparatus for various axles or wheels the shifting pinion is withdrawn
from engagement with the first wheel, the latter is exchanged and the shifting pinion
brought into that position required to connect the new wheel with the actuating
pinion.
London, 3rd December 1895
COMPLETE SPECIFICATION.
Improvements in or relating to Apparatus for Counting the
Revolutions of Axles and the like.
We ALBERT WALTER GAMAGE Outfitter of 126 Holborn and GEORGE ALBERT
BOLTON Mechanical Engineer of 118 Holborn both in the City of London, 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 invention relates to improvements in or applicable to apparatus for counting

page_text: revolutions of axles and the like, such as cyclometers tachometers and similar
mechanisms.
In such apparatus it has heretofore been difficult to set the hands to zero and still
more difficult to adjust the apparatus for axles, wheels or the like of different
diameter.
This invention is intended to overcome these difficulties and is carried into effect as
follows:-
In cyclometers and the like the motion of the axle or wheel the speed of which is to
be measured or the number of whose revolutions is to be ascertained is transmitted
by suitable means to a pinion within the casing enclosing the works and thence
directly to the counting train. In setting the hands all the parts have to be moved
back as far as they were previously advanced and for the purpose of adapting the
whole to various spindles both the actuating pinion and the first wheel of the counting
train bave to be exchanged.
According to this invention we interpose a pinion between the actuating pinion and
the first wheel hereinabove mentioned. This new pinion is so mounted on a movable
axle that it can be shifted along the periphery of the actuating pinion. Outside the
casing a stud or button is provided for operating the shifting pinion.
When the hands are to be set the shifting pinion is moved until it leaves the first
wheel of the train, being brought into position again to connect the first wheel and
actuating pinion when the hands have been set.
To adapt the apparatus for ascertaining the linear speed of various axles or wheels
the shifting pinion is withdrawn from engagement with the first wheel, the latter is
exchanged and the shifting pinion brought into that position required to connect the
new wheel with the actuating pinion.
This invention is illustrated in the accompanying drawings in which Fig. 1 shows
the internal parts of the apparatus the dial plate being removed, Fig. 2 shows a
similar view with some other parts removed also.
A is a star wheel which receives movement from the axle or the like the revolutions
whereof require to be counted. Its spindle works in a sleeve B, is surrounded by a
spring C and terminates in a snail or cam plate D, acting on a pinion E. This
through another pinion F, clearly shown in Fig. 2, transmits movement to the
pinion G, geared to the first wheel of the counting mechanism, H, Figs. 1 and 2.
The pinion G is mounted on a bracket G', which may be raised or lowered by the
screw G² so that the pinion G is thrown into or out of gear with the first wheel H.
When the parts are in the position shown in the drawings, the apparatus is ready for
operation, if it is to be set, to "zero" say, the star wheel A is pulled outward so that
the snail D leaves the pinion E and the first wheel H can be turned by the aid of a
watch key applied to its squared spindle. This may also be effected by raising the
pinion G out of gear with the wheel H and then turning the latter by a key.
If the apparatus is to be adapted for axles or wheels of varying diameter in order to
measure their linear speed this may be effected by changing the pinion G, or by
changing the snail D, in neither case need the counting mechanism be altered; or the
first wheel may be changed.
The spring not only holds the snail D to the wheel E when the apparatus is
operative, whilst allowing it to be disconnected when desired, but will also automatically
"take up
wear so that the apparatus is very durable.
"
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. An apparatus for counting the revolutions of axles, and the like in which the
pinion or equivalent device by which the motion is transmitted to the first wheel of
the counting mechanism may be made to engage with, or release said first wheel, as
and for the purpose set forth.
2. In apparatus for counting revolutions of axles and the like, the shifting pinion
arranged and operating as set forth and illustrated in the drawings.

page_text: 3. In apparatus for counting revolutions of axles the movable snail or cam disc D,
arranged and operating as set forth and shown.
Dated this 4th day of September 1896.
BERNHARD DUKES,
226, High Holborn, London, W.C., Agent for the Applicants.