Improvements relating to Dynamometers.
Year: 1889

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to Dynamometers.
I, AUGUST ACKERMANN of Grellingen, in the Republic of Switzerland, Manager
of Spinning Mills, do hereby declare the nature of this invention to be as follows:
This invention relates to a rotating dynamometer to be called "Universal" so
constructed that it can be applied, for transmitting and indicating power, between tho
driving shaft or an intermediate shaft in the works and the machine, the power of
which it is desired to measure. The apparatus indicates with rapidity and precision the
power the dynamometer transmits to the machine.
My improved rotating dynamometer comprises a drum carrying radial bevelled
pinions which are loose upon their axes and gear with a bevel wheel fixed to a loose
pulley; they are connected by means of chains or bands to a movable plate operated
upon by spiral springs and actuating a rod in the interior of a hollow shaft of the
dynamometer, so that the power transmitted by the dynamometer to the machine, the
power of which is to be measured, is communicated by the winding of the chains or
bands on the bosses of the bevel pinions and consequently by the displacement of the
movable plate and the rod connected thereto, whereby the work performed by the machine
is indicated in horse-power upon a suitably graduated scale introduced into the hollow
space in the dynamometer shaft.
The arrangement of mechanism which allows of the dynamometer being applied for
transmitting power either to a shaft specially provided for this purpose or to the shaft
of a suitable machine consists of a central sleeve, one end of which is of conical form
and is provided with longitudinal slits so as to form springs therein.
In a groove
made in the solid rear portion of the said central sleeve is placed a bronze sleeve upon
which is screwed a nut provided on its periphery with two sets of threads on which
are respectively screwed a sleeve, part of which is formed conical, and the hollow
shaft, so that the dynamometer can be placed in or out of gear with the shaft to
which it is adapted by the movement of one cone within the other.
Dain the 1011
C
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Dynamometers.
I, AUGUST ACKERMANN, of Grellingen, in the Republic of Switzerland, Manager of
Spinning Mills, 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 a rotating dynamometer to be called "Universal" so
constructed that it can be applied for transmitting and indicating power between the
driving shaft or an intermediate shaft in the works and the machine the consumption
of power of which it is desired to measure. The apparatus indicates with rapidity and
precision the power the dynamometer transmits to the machine.

page_text: of bronze capable of turning in this groove and screw-threaded on the exterior. On
this collar c is screwed the nut C provided with two sets of peripheral screw
threads & st. The set of threads st serves for effecting the coupling and the
uncoupling by moving the sleeve B in one direction or the other in the interior of
the sleeve D which is formed conical at the front part e, and is screw-threaded at the
other end. On the sleeve B being advanced into the interior of the sleeve D¹ the
desired distance for the cone to be firmly gripped between the shaft A and
the conical part e, and the coupling thereby effected, the hollow shaft D is screwed
on the screw-threaded parts of the nut C until it presses the rib or flange of the
drum against the sleeve D'. The drum E is then fixed in position relatively to the
other parts and the whole will be firmly fixed together. For uncoupling, the shaft D
is unscrewed and the nut C is turned in the proper direction for the conical part b
of the sleeve B to be withdrawn from the conical part e, of the sleeve D'.
25
threads ss.
The set of threads & serves for effecting the coupling and the
uncoupling by moving the sleeve B in one direction or the other in the interior of
the sleeve D which is formed conical at the front part e, and is screw-threaded at the
other end. On the sleeve B being advanced into the interior of the sleeve D¹ the
desired distance for the cone to be firmly gripped between the shaft A and
the conical part e, and the coupling thereby effected, the hollow shaft D is screwed
on the screw-threaded parts of the nut C until it presses the rib or flange f of the
drum against the sleeve D¹. The drum E is then fixed in position relatively to the
other parts and the whole will be firmly fixed together. For uncoupling, the shaft D
is unscrewed and the nut C is turned in the proper direction for the conical part b
of the sleeve B to be withdrawn from the conical part e, of the sleeve D'.
III. METHOD OF EMPLOYING THE DYNAMOMETER.
For measuring the power transmitted to a machine by means of my dynamometer
it is adapted in the most advantageous manner by means of its coupling arrangement
to a shaft A specially constructed for this purpose. The shaft A and with it the
dynamometer is; for example, driven by means of the pulley S from the main shaft: in
the works while the machine, the power transmitted to which it is desired to measure
is connected with the pulley H. On the driving band being passed from the loose
pulley T onto the pulley S fixed on the shaft A, the dynamometer commences to
turn the pulley H, however, under the resistance of the machine to be tested remains.
for an instant at rest as well as the bevel wheel G. It follows that the pinions F, F
turn upon their own axes; and wind a portion of the chains or bands I, I, I upon their
bosses and consequently move the plate J on the shaft D so as to compress the
springs R, R until the tension of these springs is equal to the resistance of the
machine to be tested. At this moment the rotating movement of the pinions.F, F
around their axes 1, is arrested and, as during this time the dynamometer continues..
to rotate, they communicate movement to the bevel wheel G and consequently also to
the pulley H and to the machine to which this latter is connected.
It will thus be seen that it is only at the moment when the dynamometer ascertains..
the amount of power necessary to drive the machine that the latter commences to turn.
The main driving sbaft can in some cases be connected by a driving band to the
pulley H, and the dynamometer shaft to the machine to be tested.
When the dynamometer is employed intermediately between the driving shaft in
the works and the machine to be tested it rests on a small portable carriage to which.
an arrangement of regulating screws is adapted, allowing of its being fixed in position
in any place with a view of lessening the injurious effects occasioned by; or of entirely
preventing the swinging or swaying of the apparatus. The apparatus is further pro-
vided with a suitable arrangement which allows of it being suspended, if desired, from
the ceiling of the works at any suitable height.
IV. GRADUATION OF THE SOALE.
11728
To effect the graduation, the shaft of the dynamometer is by preference held in a
vice so as to allow of the pulley H.turning freely-on the sleeve-D'. The weights in
respect of which it is desired. to. graduate are then suspended from the periphery of
the pulley H by means of a flexible band. The scale is each time inserted in the
hollow space determined by the rod r, and the various indications are marked on the
scale by a style and constitute the graduation. The scale can be graduated on any
desired basis for example, if the pulley H be caused to revolve 7.5 times in a
second. its circumference being 1 metro and from it is cucnandad

page_text: When the graduation has been made for a certain speed v, it will always serve for
another speed by simply multiplying the results of the dynamometer by
V. ADVANTAGES OF THIS DYNAMOMETER.
(1) Convenience of working and coupling the apparatus.
บ.
(2) Arrangement of the pinions F, F, of the chains or bands I, I, and of the rod »
inside the closed drum E in as small a space as possible.
(3) Sensibility of the springs R, R, that. is to say, accuracy of the measurements
furnished by the apparatus, however small may be the differences of power.
(4) Rapid reading off of the mechanical force in horse-power without any additional
calculation.
(5) Portability of the apparatus on its carriage provided with the safety arrangement
or provision against oscillation.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. My rotating dynamometer comprising a drum carrying bevel pinions mounted
loosely on their axes meshing with a bevel wheel fixed to a loose pulley and connected
by chains or bands with a movable plate acted upon by spiral springs, the said
movable plate actuating a rod in the interior of a hollow shaft, so that the power
transmitted by the dynamometer to the machine to be tested is transferred by a
winding of the chains or bands on the bosses of the bevel pinions and consequently
by a displacement of the movable plate and of the rod connected thereto which
allows the amount of power consumed by the machine to be ascertained by simply
reading it off a scale directly graduated in horse-power, the scale being introduced
into. the open end of the hollow shaft of the dynamometer, substantially as hereinbefore
described and illustrated in the accompanying drawing.
2. The interlocking or coupling arrangement by means of which the dynamo-
nieter can be adapted for measuring power in transmission either to a shaft specially
constructed for this purpose or to the shaft of any other machine; the said arrangement
consisting of a central sleeve, one end of which forms a gripping cone and is. provided
with longitudinal slits, a bronze collar placed in a groove in the said central sleeve,
and a nut screwed on the bronze collar and provided on its periphery with two sets of
screw-threads on which are respectively screwed a sleeve provided with a conical part,
and a hollow shaft, so that the coupling of the dynamometer with the shaft to which
it is adapted can be effected or not by moving the gripping cone of the central sleeve:
in the required direction within the conical part of the outer sleeve, substantially as
herein before described and illustrated in the accompanying drawing.
1.3. The improved dynamometer herein before described with. reference to the
accompanying drawing.
Dated the 27th day of January 1890.
G: F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.