Improvements in Governors for Steam Engines.
Year: 1899

page_text: Date of Application, 15th May, 1899-Accepted, 22nd July, 1899
COMPLETE SPECIFICATION.
Improvements in Governors for Steam Engines.
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I, ANDRIES VAN DER WOERD, of Linnaensstraat 41, Amsterdam, in the King-
dom of Holland, Manufacturer, 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, and accompanying drawing, that
is to say:-
The present invention has for its object improvements in centrifugal governors
for steam engines, in which one arm of a lever connected to the governor influences
the movement of one of the admission valves of the engine, independently of the
other arm which influences the other admission valve.
In the accompanying drawing, which is in illustration of the invention:
Figure 1 is a plan of the governor, partly in section;
Figure 2 is an end view, partly in section, of a horizontal engine to which the
governor is applied;
Figure 3 is a perspective view of one of the details.
The governor consists of a horizontal shaft 7, revolving in bearings s carried
by brackets connected to the frame of the engine. Upon the shaft is fixed a
sleeve or collar g, which carries, by means of an S-shaped bar, two lever arms b, b,
jointed to the ends of the bar, and each provided with a weight c. The two lever
arms are connected together by a rod f jointed to them, (Figure 1).
Each of the lever arms 6 terminates, at the opposite end to that which carries
the weight c, in a hook which is in contact with the flange i of a sleeve screwed
into the end of another sleeve a. The two sleeves a can move longitudinally,
together with the sleeves which are screwed into them, upon the shaft 1, and
they are caused to revolve together with the shaft by means of pins fixed to the
latter and sliding in longitudinal grooves in the sleeves a. Each of the latter
has formed upon it a projection h which serves as a cam and is of the shape shown
approximately in Figure 1.
Upon each of these cams runs a roller & carried by a lever e, which can oscillate
round an axis m carried by the support r. Each of these levers e operates one of
the admission valves at w of the steam cylinder 10 of the engine (Figure 2), by
means of a connecting rod z and a lever 2 resting upon a slightly inclined sur-
face 11 and jointed to the spindle 3 of the valve, so as to raise the latter when
necessary for the admission of steam to the cylinder; the valve being closed and
brought back to its seat by a spring 8. The position of the roller d on the lever e,
may be varied by means of an adjusting screw x (Figures 1 and 2).
Excentrics upon the shaft / actuate the exhaust valves at e, by means of valve
spindles 7, centre pins 4 and levers 5 and 6, the latter raising the spindle 7 of
the valve which is closed and brought back to its seat by a spiral spring 9
(Figure 2).
The action of the apparatus is as follows:-Having placed, by means of the
sleeves i, the sleeves in a position corresponding with the speed at which it
is desired that the engine should work, the more that speed is increased and
the weights e separated by centrifugal force, the more will the sleeves a be brought
together by the hooked ends of the levers 6, and the less time will the roller d
TD
.

page_text: or notch in the spindle n upon which is fixed a ratchet toothed wheel (Figure 3);
the spindle has a square end o, upon which a key can be fitted so as to tighten
up the spring more or less. A pall p keeps the ratchet wheel from turning back.
The screw by which the position of the roller d can be varied, allows the time
of opening of the admission valve to be altered more or less. Each of the two
levers carrying the weights, although the levers are connected together, works
directly upon one of the two cam sleeves, and each of the latter is brought back by
a separate adjustable spiral spring j. is a protecting cover for the parts of the
governor.
The shaft is driven by any suitable gear from the engine.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
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1. A centrifugal governor, applicable to steam engines having separate admis-
sion valves, in which two sleeves provided with cams, and moveable longitudinally
along a shaft driven by the engine, are each actuated separately by a lever pro-
vided with a weight, and revolving round the said shaft, the two weighted levers
being connected together by a bar jointed to them, a roller upon a lever actuating
one of the admission steam valves of the engine, running upon a projecting cam
upon each of the sleeves, and being raised by the cam for a time-less as the speed
of the engine is greater, so as to obtain a correspondingly shorter admission of
steam, and the two sleeves being brought back to their normal positions by spiral
springs the strength of which is adjustable, so that the speed of the engine can
be varied, the variable position of the rollers upon the levers which operate the
admission valves, allowing the opening of such valves to be adjusted, the two
weighted levers actuating each separately one of the two cam sleeves, all substan-
tially as described and illustrated.
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2. In a governor such as is claimed in Claim 1, the arangement of a shaft !
driven by the engine, upon which is fixed a sleeve g supporting two levers b
carrying at one of their ends a weight c, and hook-shaped at their other end,
two sleeves a each provided with a projecting cam h, and capable of moving longi-
tudinally upon the shaft I, sleeves screwed to those just described, and each
having a flange against which the lever operates, two levers e cach actuating
one of the admission valves of the engine, and turning upon an axis m and pro-
vided with a roller & running upon the corresponding sleeve a so as to vary the
period of admission according to the speed of the engine, that is to say according
to the position of the specially-shaped projecting cam h with regard to the corre
sponding roller d, adjustable springs which tend to bring the sleeves back
separately to the position corresponding with the normal speed of the engine,
and two excentrics fixed upon the governor shaft and actuating by means of suit-
able levers the exhaust valves of the engine, all substantially as described and
illustrated.
Dal 1111. 1
1000
EDWARDS AND CO.,
Chartered Patent Agents,
65 and 66, Chancery Lane, London,
Agents for the Applicant.