Improvements in Drum Governors for Regulating the Speed of Motors.
Year: 1891

page_text: Date of Application, 16th May, 1891
Complete Specification Left, 14th Mar., 1892-Accepted, 16th Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Drum Governors for Regulating the Speed of
Motors.
LORD JAMES TRACY Engineer 17, Grecian Street Lower Broughton Manchester.
I do hereby declare the nature of this invention to be as follows:-
This shaft governor commonly termed a drum governor is for the purpose of
automatically controlling the varying degrees of cut off and at the same time to
maintain a lead suitable to every grade of expansion.
The mechanism consists in an excentric boss encircling the crank shaft or its
equivalent, and on this boss is mounted a sleeve which is free to rotate on the said
boss.
The said sleeve is constructed to carry an external or internal working excentric
or overhung pin if desired, for the purpose of actuating the steam (or other pressure)
supply valve spindle in the ordinary manner.
The said sleeve is provided with lugs and pins or other suitable devices, for
receiving a rotative movement through links or connecting rods attached to two fly
weights.
The said weights are pivotted in a plate or drum, and are anchored by a spring
attachment, the said springs being made adjustable to procure an equal turning
speed of the engine or motor under varying loads.
The said weights and spring attachments are made to rotate on the engine shaft,
and consequently any increase or decrease of speed alters the position of the said
weights whereby, the angular advance of the excentric is varied, through the links
attached to said weights and springs in combination, together with the sleeve before
named, and; the action of these parts from centrifugal and centripetal forces give
regular speed to the engine as beforenamed.
Dated this 15th dor of No 1801
COMPLETE SPECIFICATION.
Improvements in Drum Governors for Regulating the Speed of
Motors.
I LORD JAMES TRACY of 17 Grecian Street, Lower Broughton, Manchester in
the County of Lancaster, Engineer, 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 shaft governor commonly termed a drum governor is for the purpose of
automatically controlling the varying degrees of cut-off and at the same time to
maintain a lead suitable to every grade of expansion.
The mechanism consists in an eccentric boss encircling the crank shaft or its
equivalent and on this boss is mounted a sleeve which is free to rotate on the said
boss.
The said sleeve is constructed to carry an external or internal working eccentric
or overhung pin if desired for the purpose of actuating the steam supply valve
spindle in the ordinary manner.
The said sleeve is provided with lugs and pins or other suitable devices for
receiving a rotative movement through links or connecting rods attached to two fly
weights.
The said weights are pivotted in a plate or drum and are anchored by a spring

page_text: attachment, the said springs being made adjustable to procure an equal turning
speed of the engine or motor under varying loads.
The said weights and spring attachments are made to rotate on the engine
shaft and consequently any increase or decrease of speed alters the position of
the said weights whereby the angular advance of the eccentric is varied through
the links attached to said weights and springs in combination together with the
sleeve beforenamed and the action of these parts from centrifugal and centripetal
forces give regular speed to the engine as beforenamed.
And in order that my invention may be better understood I have appended here-
with one sheet of drawings marked with figures of reference, corresponding figures
indicating like parts.
Figs. 1 and 2 show an elevation and section of the governor arranged upon a
plate carried by the eccentric boss.
Figs. 3 and 4 show an elevation and section of the governor arranged in a fly
wheel or pulley.
Figs. 5 and
loads.
show methods of spring attachment and anchorage under varying
1 is the crank shaft or its equivalent 2 is the eccentric boss, 3 is the plate in
which are pivotted the fly weights. 4. 4' on pins 5. 5'.
On the eccentric boss 2 is mounted loosely the sleeve 6, the sleeve 6 is constructed
with the working eccentric 7 which actuates the steam supply valve spindle or its
equivalent. The sleeve 6 is provided with lugs and pins 8. 81 which rotate the
sleeve 6 and with it the working eccentric 7 through links 9. 91 attached to
pins 10. 10 in fly weights 4. 4.
The springs 11. 11 resist the outward movement of the fly weights 4. 4' through
anchor bolts 12. 12 taking hold of weights 4. 4 through lugs or pins 13. 131
and the abutments 14. 14' in plate 3. 15. 15 are rubber buffer stops to
weights 4. 41.
When the whole is rotated by being keyed on the engine shaft 1 or its equivalent
any increase or decrease of speed alters the position of the fly weights 4. 4¹ and so
through links 9. 91, the working eccentric 7 is rotated partially, whereby the angular
advance and cut-off is effected.
Fig. 5 shows the anchor bolts 12. 121 and weights 4. 4¹ furnished with knife edges
and double springs 11. 11 to reduce friction.
Fig. 6 shows the movable spring abutments 14. 14'.
Having thus particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I wish it to be understood, that I
am aware that governors have been made in which fly weights pivotted in the plane
of rotation have been controlled by springs, y weights actuating eccentrics in
various ways, but what I claim and believe to be new is :-
First. The arrangement, form, and location of weights, pivots, and springs,
whereby when rotated an even governing control of the engine or motor is
obtained.
Second. The mounting of the inner and working eccentric in the manner
described whereby the varying degrees of cut-off and at the same time, a suitable
lead to every grade of expansion.
Third. The movement of the spring abutments 14. 14' whereby the compression
of springs 11. 11' can be varied when running and the speed and load adjusted as
required.
Dated this 12th day of March 1895
LORD JAMES TRACY.