Improvements in or Connected with Rotatory Governors.
Year: 1889

page_text: Date of Application, 4th Nov., 1889-Accepted, 7th Dec., 1889
COMPLETE SPECIFICATION.
Improvements in or Connected with Rotatory Governors.
I, DAVID JAMES MURRAY, of 131 Fore Street, St. Clements, Ipswich, in the County
of Suffolk, Draughtsman, 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, that is to say:
My said Invention has for its object to apply improved automatic compensating
mechanism to a rotatory governor such mechanism being such as to cause the engine
or machine to which the governor is fitted to run at its proper speed notwithstanding
that at different times owing to differences of resistance or of motive pressure the
throttle valve or other controlling device has to be in different positions to obtain that
result.
In carrying out my Invention 1 combine a correcting or compensating governor
with the main governor, the parts of the two governors being by preference on the
same vertical shaft; and I cause the compensating governor to act by varying the
effective weight which resists the centrifugal action of the main governor balls.
A governor as constructed according to my Invention is shown on an accompanying
sheet of explanatory drawings, figures, 1, and 2, being elevations as at right angles
to each other, figure, 1, being partly in section, whilst figure, 3, is a horizontal
section.
The governor shaft, 4, which may be driven in any convenient way, has bearings at
the lower and upper parts of an oval frame casting or standard, 5, and has the main
governor balls, 6, connected to its upper end. The balls, 6, are, in a usual manner,
connected by links to the neck, 7, of a central weight, 8, which is movable along the
shaft; and the neck or sleeve, 7, by means of a groove and forked arm, 9, moves a
lever frame, 10, a stud, 11, on which communicates the governing action through a link
(not shown) to a throttle valve or other controlling device. The lever frame, 10, is
centered on a spindle, 12, held by a bracket, 13, formed or fixed on the standard, 5;
and at one side it is made with, bars, 14, which guide a compensating weight, 15.
The weight, 15, is movable along the guide bars, 14, by a spindle, 16, which has on
its middle part a screw thread working in an internal screw formed through the
weight; and the spindle, 16, has on its outer end a spurwheel, 17, gearing with a
spurwheel, 18, on another spindle also carried by the lever frame, 10, and having fast
on it a bevil wheel, 19, gearing with a bevil wheel, 20, loose on the centre spindle, 12,
of the lever frame. The bevil wheel, 20, has formed in one piece with it a toothed
wheel, 21, constructed for being acted on by one or other of two pawls, 22, 23, jointed
on a pin on a lever, 24, and pressed towards the wheel, 21, by a spring. The lever, 24,
which is two-armed is centered on the spindle, 12, and is connected by a rod, 25, which
may be adjustable upon it to a crank pin, 26, which is adjustable on a wheel, 27, driven
from the governor shaft through toothed wheels, 28.
Whilst the governor is rotating at its proper speed, the pawls, 22, 23, are prevented
from acting on the wheel, 21, by a segmental cylindrical flange on a sector, 29, which
is centered on the spindle, 12, the sector flange being then between the pawls and the
teeth of the wheel, 21. The sector, 29, is connected by a rod, 30, to a lever or lever
frame, 31, which is acted on by the sliding sleeve, 32, of the second or compensating
governor, 33, fitted upon the governor shaft, 4, within the oval opening of the
standard, 5.
If an increase of speed takes place the main governor at once acts through the
lever frame, 10, to partly close the throttle valve or to act equivalently on some other
controlling device of the engine or machine. At the same time the compensating
governor raises the lever, 31, and through the rod, 30, moves the sector, 29, over
towards the right hand (as shown in figure 2). This allows the left-hand pawl, 22,

page_text: to act on the wheel, 21, and the movement of this wheel is transmitted through the
wheels, 20, 19, 18, 17, to the spindle, 16, in a manner to make that spindle screw the
weight, 15, towards the outer part of the lever frame, 10, and so that it will partly
counterbalance the main governor weight, 8. This action will prevent the main
governor from reopening the throttle valve to its former position when the speed
returns to its proper rate, and from thereby producing oscillations which occur with
a common (single) governor. If the speed gets below its proper rate the reverse
action of the parts takes place. The correcting or compensating action by means of
the pawls, 22, 23, continues until the second governor, 33, returns to its normal
speed and brings its lever, 31, and the sector, 29, to their middle positions. The
maximum stroke of the pawls, 22, 23, is to the ends of the sector, 29, when this
sector is in its middle position; but their stroke can be lessened if found desirable
in practice by adjusting the crank, 26, nearer to the centre of its wheel, 27.
The screwed part of the spindle, 16, which moves the compensating weight, 15, is
of limited extent, and if the screwing action should from any cause continue longer
than is provided for, the weight passes off the screwed part and ceases to be moved
further. Springs, 35, are placed on the ends of the spindle, 16, to keep the weight, 15,
close to the screwed part when not on it so that the screw may at once engage with
the weight whenever it turns in a direction to move the weight towards the middle of
the lever frame.
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. Combining the parts of and connected with rotatory governors in the improved
manner and for the purposes substantially as hereinbefore described.
2. Combining with a main rotatory governor a second or compensating governor
which causes the effective weight on the main governor to be adjusted as required,
the mechanism for this purpose being arranged and operating substantially as
herein before described.
Dated this Second day of November 1889.
EDMUND HUNT,
Applicant's Agent.