IMPROVEMENTS IN GOVERNORS APPLICABLE TO STEAM ENGINES, OR ENGINES DRIVEN BY ANY GAS OR VAPOUR
Year: 1884

page_text: PROVISIONAL SPECIFICATION,
, I GUSTAVE RÉVET of Bolbec in the department of the Seine-Inférieure
arrondissement du Havre, France do hereby declare the nature of my Invention
for the IMPROVEMENTS IN GOVERNORS APPLICABLE TO STEAM ENGINES, OR
ENGINES DRIVEN BY ANY GAS OR VAPOUR to be as follows:-
In the description which follows the improvement is described as applied to a
steam engine governor, but the same description will apply to an engine driven by
any gas or vapour, and to make the improvement clear I must describe the action
of the ordinary governor. The speed of the ordinary engine governor varies with
the speed of the engine, and at the same time varies the admission of steam to the
engine; for instance-if the speed of the engine or governor increases from its
normal speed, the admission of steam to the engine is reduced and if the governor
speed falls, the admission of steam to the engine is increased-the result of this
being that if, from any cause, the speed of the engine changes from its normal
speed the ordinary governor can only correct this variation by allowing the engine
speed to vary between a speed too high and a speed too low, the normal speed
being the mean of these variations. For instance, I will suppose the speed of the
engine to increase, (the same argument will apply to a fall in speed.) in other words
the governor, when in its normal position adinits too much steam for the power
the engine is called upon to perform-and the governor rising closes proportionately
the steam admission, reducing the engine speed again to its norinal speed, but the
governor admits, at its normal speed, too much steam, so the engine speed increases
again, to be again checked thereby producing a series of variations. The smaller
these variations are, or the quicker the governor acts, the more perfect the governor.
In my improved governor I do away with this series of variation, for when once
the governor has determined the admission of steam required to drive the engine
at its normal speed, under the new conditions or resistance the engine has to
overcome, the governor can return to its normal position without altering this
admission.
On the accompanying Drawing Figure 1 represents a sectional elevation of my
Invention. A is an ordinary regulateur or governor. B is a disc revolving freely
in its support C, and kept up against the two discs E and F by a coil spring D.
E and F have two bevel wheels G & H attached to them which command the two
pinions K and L.
The discs E and F with the pinions K and L, rise and fall with the governor A.
The working of this governor may be explained thus:-
The disc F with its bevel wheel, revolves with the governor A The disc E
turns independently of the governor A. The disc F drives by friction the disc B;

page_text: and B by friction drives E in an opposite direction to F. The speeds of the
discs E and F will be equal as long as they are equidistant from the centre of B.; and
in this equidistant position the pinions K and L remain stationary with regard to
the motion round the governor but if the governor should rise or fall and with it
the discs E and F, their speeds are no longer equal and the two pinions K and L
revolve round the governor-the direction in which they revolve depends on
whether the governor rises or falls; and the speed with which they revolve depends
on the amount of the rise or fall, or in other words, on the difference between the
speeds of E & F.
Suppose the governor. rises from an increase of speed-the lever M rises and
closes more or less the throttle valve, or cut off gear; but at the same time the
pinions, as explained before, begin to revolve and with them the screw O, with
which they form part; and the screw working in the nut N lifts the nut N;
and as the governor falls the nut N still is screwed up until the nut remains
stationery which it only does when the governor has returned to its normal
position, that is E and F equidistant from the centre line of the disc B. In other
words the governor after finding the amount of opening of steam, or the cut off
required by the engine under any changed condition can return to its normal speed
or position without changing the admission or cut off which it could not do if the
distance between the centre line-of the lever M and the centre line (horizontal) of
the pinions K and L was fixed or the nut N a fixed portion of the governor.
Or in lieu of the nut N and lever M I may substitute a screw (or rack) N¹ and
segment lever M³ respectively as shewn in Figure 2 or the pinions K and L may
have a pulley P round them commanding a nut Q with right and left handed
screws R on one of the intermediate rods as shown in Figure 3.-or the pinions
K and J may command a piston valve direct opening or closing the entry of steam
and leaving the amount of opening stationery whilst allowing the governor to take
its normal position.

page_text: I GUSTAV RÉVET of Bolbec in the department of the Seine Inférieure
arrondissement du Havre France do hereby declare the nature of my Invention
for "IMPROVEMENTS IN GOVERNORS APPLICABLE TO STEAM ENGINES OR ENGINES
DRIVEN BY ANY GAS OR VAPOUR" and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
In the description which follows the improvement is described as applied to a
steam engine governor but the same description will apply to an engine driven by
any gas or vapour and to make the improvement clear I must describe the action
of the ordinary governor. The speed of the ordinary engine governor varies with
the speed of the engine and at the same time varies the admission of steam to the
engine for instance if the speed of the engine or governor increases from its normal
speed the admission of steam to the engine is reduced and if the governor speed
falls the admission of steam to the engine is increased the result of this being that
if from any cause the speed of the engine changes from its normal speed the
ordinary governor can only correct this variation by allowing the engine speed to
vary between a speed too high and a speed too low the normal speed being the
mean of these variations. For instance I will suppose the speed of the engine to
increase (the same argument will apply to a fall in speed) in other words the
governor when in its normal position admits too much steam for the power the
engine is called upon to perform and the governor rising closes proportionately
the steam admission reducing the engine speed again to its normal speed but the
governor admits at its normal speed too much steam so the engine speed increases
again to be again checked thereby producing a series of variations. The smaller
these variations are or the quicker the governor acts the more perfect the
governor. In my improved governor I do away with this series of variations for
when once the governor has determined the admission of steam required to drive
the engine at its normal speed under the new conditions or resistance the engine
has to overcome the governor can return to its normal position without altering the
admission.
On the accompanying Drawing Figure 1 represents a sectional elevation of my
Invention.
A is an ordinary regulator or governor B is a disc revolving freely in its
support C and kept up against the two discs E and F by a coil spring D-E and F
have two bevil wheels G and H attached to them which command the two
pinions K and L. The discs E and F with the pinions K and L rise and fall with
the governor A.
The working of this governor may be thus described.
The disc F with its bevil wheel H revolves with the governor A. The disc E
turns independently of the governor A. The disc F drives by friction the disc B
and the latter by friction drives E in an opposite direction to F. The speeds of the
discs E and F will be equal as long as they are equidistant from the centre of B
and in this equidistant position the pinions K and L remain stationary with regard
to the motion round the governor but if the governor should rise or fall and with it
the discs E and F their speeds are no longer equal and the two pinions K and L
revolve round the governor. The direction in which they revolve depends on
whether the governor rises or falls and the speed with which they revolve depends
on the amount of the rise or fall or in other words on the difference between the
speeds of the discs E and F,

page_text: Suppose the governor rises from an increase of speed the lever M rises and closes
more or less the throttle valve or cut off gear but at the same time the pinions K
and L as before explained begin to revolve and with them the screw O with which
they form part and the screw O working in the nut N lifts the latter and as the
governor falls the nut N still is screwed up until it remains stationary which it
only does when the governor. has returned to its normal position that is E and F
equidistant from the centre line of the disc B. In other words the governor after
finding the amount of opening of steam or the cut off required by the engine under
any changed condition can return to its normal speed or position without changing
the admission or cut off which it could not do if the distance between the centre
line of the lever M and the centre line (horizontal) of the pinions K and L was fixed
or the nut N a fixed portion of the governor.
Or in lieu of the nut N and lever M I may substitute a screw (or rack) N¹ and
segment lever M₁ respectively as shewn in Figure 2 or the pinions K and L may
have a pulley P round then commanding a nut Q with right and left handed
screws R on one of the intermediate rods as shewn in Figure 3 or the pinions K
and L may command a piston valve direct opening or closing the entry of steam
and leaving the amount of opening stationary whilst allowing the governor to take
its normal position.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1. The application and use to the governor or regulator of a steam or other
-engine-of-horizontal-discs-in-combination-with-a-friction-disc-and-formed-or-
provided with bevil wheels in combination with bevil pinions rotating a screw on
which works a nut (or which gears into a rack) on the throttle valve or other
regulating lever substantially as and for the purpose herein before described and
illustrated by Figure 1 (or 2) on the accompanying Drawing.
2. The combination and use with the bevil pinions of a pulley commanding a nut
working over right and left handed screws on one of the intermediate rods of the
throttle valve or cut off gear (in lieu of the screw and nut in Figure 1) substantially
as hereinbefore described and illustrated by Figure 3 on the accompanying
Drawing.