Improvements in Automatic Expansion Governors.
Year: 1895

page_text: Date of Application, 18th Feb., 1895
Complete Specification Left, 15th Nov., 1895-Accepted, 21st Dec., 1895
TROVISIONAL SPECIFICATION.
Improvements in Automatic Expansion Governors.
1, Joux SMITH RAWORTH, of 24 Kirkstall Road, Streatham, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to fly-wheel governors which act directly upon the main
slide valve, or on a separate expansion slide, for controlling the speed of a steam
engine, by varying the point of cut off according to the load.
The object of my invention is to render this class of governor as reliable and as
free from destructive wear as any other part of the engine.
To this end I dispense with links and small pins and reduce the number of parts
to a minimum, my improved governor consisting only of the following parts, viz., a
fly-wheel, an eccentric plate, two weighted arms, and two springs.
The fly-wheel is made preferably as a disc; it carries on the side nearest the
bearing the eccentric plate, and on the other side the weights and springs.
The eccentric plate covers nearly the whole side of the disc, and the eccentric is
cast in one piece with the plate. The weighted arms are formed each with a very
large gudgeon cast or bolted on, these gudgeons fitting into holes bored right
through the dise and made as large in size as they can.conveniently be made.
The said gudgeons carry large eccentric pins on the other side of the disc, i.e. next
to the bearing, which pius engage into corresponding eyes in the eccentric plate.
The eccentric plate is further steadied by taking a bearing on the disc at two points
at opposite ends of a diameter at right angles to a line joining the two above
mentioned eyes.
The springs are so arranged that they can be screwed up to the
required tension, to balance the centrifugal force of the weights at the desired
speed.
Dated 1: 10.1
J
100+
Improvements in Automatic Expansion Governors.
I, JOHN SMITH RAWORTH, of 24 Kirkstall Road, Streatham, in the County
of Surrey, 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 :-
My invention relates to fly-wheel governors which act directly upon the main
slide valve, or ou a separate expansion slide, for controlling the speed of a steam
engine by varying the point of cut off according to the load.
The object of my invention is to render this class of governor as reliable and as
free from destructive wear as any other part of the engine.
To this end I construct a governor as hereinafter described with reference to the
accompanying illustrative drawings, dispensing with links and small pins and using
Price Ed.

page_text: a minimum number of principal parts, namely, a fly-wheel, an eccentric plate, two
weighted arms, and two springs.
Keferring to the drawings,
Figs. 1 and 2 are elevations of the respective sides of my improved automatic
expansion governor, and
Fig. 3 is a cross section thereof on the line aa of Figs. 1 and 2.
1 is a fly-wheel made preferably as a disc flanged at its periphery as shown.
It carries on the side nearest the bearing, the eccentric plate 2, and on the other
side the weighted arms 3 and springs 4. The eccentric plate corers a large
proportion of the side of the disc next which it is placed, and the eccentric 2 is
cast in one piece with it. The weighted arms 3 are formed or provided each with
a very large gudgeon 3ª that may be cast on, or, as in the construction shown,
bolted on these gudgeons fitting into holes bored right through the disc 1 and made
-as large in size as they can conveniently be made. The said gudgeons each carry
a large eccentrically arranged pin 5 on the other side of the disc, i.e. the side next
to the adjacent bearing for the shaft on which the fly wheel is fixed, the two pins
engaging in corresponding eyes 2 in the eccentric plate 2, so that they will, under
the action of the weighted arms 3, move the said plate and adjust the position of
the eccentric in accordance with the speed of the engine to which the governor is
applied. The eccentric plate is further steadied by causing it to take a bearing on
the disc 1 at two points 6, 6"-located at opposite ends of a diameter at right angles
to a line joining the two eyes 2°. The springs 4, which are shown as coiled metal
springs are so arranged that they can be screwed up to the required tension to
balance the centrifugal force of the weighted arms 3 when the engine is running at
the desired speed. For this purpose, one end of each spring may be secured
by a screw bolt 7 to the periphery of the fly wheel 1, its other end being connected
to a screw bolt 8 that extends through a hole in the corresponding weighted arm 3
and is provided with an adjusting nut, 9, arranged in a slot 3ª in the said arm.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is-
The herein described and illustrated improved automatic expansion governor.
Dated this 15th day of November 1895.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.