IMPROVEMENTS IN TACHOMETERS OR CONTINUOUS SPEED INDICATORS
Year: 1884

page_text: I, ARNOLD BUDENBERG of Southgate in the City of Manchester in the County
of Lancaster Mechanical Engineer do hereby declare the nature of said invention
for "IMPROVEMENTS IN TACHOMETERS OR CONTINUOUS SPEED INDICATORS" to be
as follows:-
These Improvements relate to Tachometers or speed Indicators and havo for their
object a continuous visible indication of the speed of rotation of shafts and other
objects.
The Tachometer constructed under these Improvements consists of an outer
casing provided on one or both sides with a graduated dial and an index finger, the
casing dial and index having a goneral resemblance to the similar parts of an
ordinary pressure gauge. Parallel with the dial and passing through the shell of
the casing is a driving spindle which is terminated between the side and the centre
of the casing. The driving spindle carries within the casing a balanced pendulum
ring which when the apparatus is at rest is compelled by springs to occupy such a
position that the plane of the ring cuts the axis of the spindle at more or less than
an angle of ninety degrees. When the Tachometer is driven by means of pulleys
or wheels placed upon the projecting portion of the spindle the centrifugal force
then developed by the rotation tends to compel the ring to revolve at a right angle
to the spindle and its exact angle will be determined by the speed of rotation tho
mass of the ring and the strength of the antagonistic springs. The mass of the
ring and the strength of the spring in a given instrument being constant it follows
that the ring will occupy a different position for every different velocity and the
position of the ring will indicate the speed of rotation.
To cause the relative positions of the ring to be indicated by the index on the
dial any well known means may be adopted such for example as that employed in
a pressure gauge. Thus the end of the driving spindle may carry a sleeve
terminated with a hardened steel point. The sleeve being connected by links to
the pendulum ring is moved to and fro by the altering angle of the ring. The
steel point is in contact with an arm or lever connected to a quadrant gearing with
a pinion on the axis of the index finger. A continuation of the shaft or sleeve
may be made to gear with the quadrant by having a number of grooves turned
upon its extremity the grooves having the same pitch as the teeth on the quadrant
and gearing therewith.

page_text: I, ARNOLD BUDENBERG of Southgate in the City of Manchester in the County
of Lancaster Mechanical Engineer do hereby declare the nature of my invention
for IMPROVEMENTS IN TACHOMETERS OR CONTINUOUS SPEED INDICATORS and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
These Improvements relate to Tachometers or Speed Indicators and have for their
object a continuous visible indication of the speed of rotation of shafts and other
objects. And in order that this Invention may be more readily understood and
carried into practical effect I have hereunto appended a sheet of drawings marked
with letters of reference, similar letters denoting similar parts in the various
figures.
Fig 1 shows in plan a Tachometer constructed according to these improvements
part of the apparatus being shown in section. Fig 2 represents a longitudinal
section of the Tachometer and Fig 3 shows modified details of Figs 1 and 2.
The Tachometer constructed under these Improvements consists of an outer
casing provided on one or both sides with a graduated dial and an index finger Z,
the casing dial and index having a general resemblance to the similar parts of an
ordinary pressure gauge. Parallel with the dial and passing through the shell of
the casing is a driving spindle W which is terminated between the side and the
centre of the casing. The driving spindle carries within the casing a balanced
pendulum ring O which when the apparatus is at rest is compelled by the springs TT
to occupy such a position that the plane of the ring cuts the axis of the spindle at
more or less than an angle of ninety degrees. When the Tachometer is driven by
means of the pulleys R or by wheels placed upon the projecting portion of the
spindle the centrifugal force then developed by the rotation tends to compel the
ring O to revolve at a right angle to the spindle and its exact angle will be
determined by the speed of rotation, the mass of the ring, and the strength of the
antagonistic springs T. T. The mass of the ring and the strength of the spring in
a given instrument being constant it follows that the ring will occupy a different
position for every different velocity and the position of the ring will indicato the
speed rotation.
To cause the relative positions of the ring to be indicated by the index on the
dial any well known means may be adopted such for example as that employed in
a pressure gauge. Thus the end of the driving spindle W may carry a sleeve V
terminated with a hardened steel point K. The sleeve being connected by links S S
to the pendulum ring O is moved to and fro by the altering angle of the ring.
The steel point K is in contact with an arm or lever X connected to a quadrant
gearing with a pinion on the axis of the index finger Z precisely as in an ordinary
pressure gauge.
The shaft or a continuation of the shaft or sleeve may be made to gear directly
with the quadrant as shown in Fig 3 where the end of the shaft W' has a number
of grooves Y turned or formed upon it these grooves having the same pitch as the
tecth upon the quadrant U. The grooved end of the shaft gears with the quadrant
which operates the index finger in the usual manner by means of a link and gearing.
In this arrangement the antagonistic spring may be coiled around the shaft W¹ as
shown at F¹.

page_text: Having now particularly described and ascertained the nature of my said
Invention as communicated to me and in what manner the same is to be performed
I declare that what I claim is
(1) In a Tachometer or continuous Speed Indicator the use of the pendulum
ring O, the antagonistic springs T. T, the links S S the point R and the lever X
operating a quadrant, pinion and index substantially as herein before described and
as illustrated in Figs 1 and 2 of the accompanying drawings.
(2) In a Tachometer or continuous speed indicator the use of the pendulum
ring the links S¹ the antagonistic spring F¹ and the grooved shaft Y gearing into
a toothed quadrant and operating a pinion and index substantially as described and
illustrated in part in Figs 1 and 2 and in part in Fig 3 of tho accompanying
Drawings.