Improvements in or relating to Speed Governors for Steam or other Engines or Motors.
Year: 1899

page_text: Date of Application, 31st July, 1899-Accepted, 23rd Sept., 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Speed Governors for Steam or other
Engines or Motors.
We, WILLIAM HORNSBY, DAVID ROBERTS, and CHARLES JAMES, Junior, all of
Spittlegate Iron Works, Grantham, in the County of Lincoln, Engineers, 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 follow-
ing statement:-
This invention relates to improvements in the method of applying an auxiliary
spring, either in tension or compression to spring governors (whether driven
direct from the crank shaft of the engine or by belts or gearing) for the purpose
of altering the speed of the engine or motor and at the same time maintaining a
66 full" to no
constant percentage of variation in the speed of the engine from
load."
We attain this object by the arrangement shewn in the accompanying drawing
wherein:-
Figure 1 is a sectional side elevation; and
Figure 2 a plan of governor mechanism provided with our improvements.
a is the sleeve of a spring governor, b a rock shaft on which levers c are keyed
and a ring arranged in a slot in the governor sleeve and to which the levers c, c
are connected.
e is a lever also keyed to the rock shaft 6 and having in it a slot e¹ in which is
fitted a block f adapted to be moved up and down by a screw g. A spring his
attached at one end to the block f and at the other end to a similar block i
adapted to be moved up or down a slot in a bracket j by a screw and a hand
wheel attached to the said screw, the said slot being inclined relatively with
the slot e in the lever e. The screw is connected to the screw g in the lever e
by rods provided with universal joints and by gearing as shewn, or by a flexible
shaft so that when the screw k is turned in one direction the screw g simultaneously
revolves in the same direction, causing the blocks f and i to travel in unison,
thus lengthening the spring h and increasing its tension, (or, if used in com-
pression, shortening the spring and increasing its compression) and increasing
the speed at which the engine or motor acts before the governor operates. If
the screws are caused to turn in the opposite direction, the effect is to shorten the
spring h, reducing its tension (or if used in compresasion lengthening the spring
and reducing its compression) and thereby reducing the speed of the engine or
motor. On the block i is arranged an index or pointer and on the face of the
bracket a scale for indicating the speed at which the engine or motor is
running.
Sometimes we prefer to fit a hand wheel to the screw g which operates the
block f and omit the coupling rods with universal joints or flexible shaft, the
screws g and being then operated separately. A pointer is in this case arranged
on the block f and a scale on the lever e similar to those on the block i and
brocket i

page_text: The lever e always swings through an angle due to the travel of the governor,
but the extension or compression of the spring h, due to the travel of the governor,
varies according to the position of the block f in the slot of the said lever, which
position is calculated and adjusted so as to give a difference in pressure on the
governor slide between what are commonly called the top and bottom positions
of the governor so that the governor maintains a constant percentage of variation
of speed between its top and bottom positions whatever number of revolutions
it may be adjusted to govern the engine or motor at.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is :-
1. The method of applying an auxiliary spring in either tension or compression
to spring governors for the purpose of varying the speed of steam or other
engines or motors, and also for the specific purpose of maintaining a constant
percentage of variation of the speed between what are commonly called the top
and bottom positions of the governor when the work of the engine or motor is
. varied from "full" to no load," substantially as described.
<
2. In a centrifugal governor, the combination with the sliding sleeve of an
auxiliary spring, in connection, at one end, with a lever oscillated by the
governor and, at the other end, with a rigid bracket, the points of connection
between the lever and bracket being made variable for increasing or diminishing
the resistance which the spring offers to the operation of the governors, sub-
stantially as described.
3. The combination with a centrifugal governor of an auxiliary spring and of
means for varying the tension or compression of the same, substantially as herein-
before described and illustrated in the accompanying drawing.
1
P T 1
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
LING TO Con STC SUT
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