Improvements in Valve Gear for Steam Engines.
Year: 1897

page_text: Date of Application, 23rd Nov., 1897-Accepted, 26th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in Valve Gear for Steam Engines.
I, JOSIAH Dow, of 5029, Morris Street, Germantown, Philadelphia, County of
Philadelphia, State of Pennsylvania, United States of America, do hereby declare
the nature of this invention and in what manuer the same is to be performed,
to be particularly described and ascertained in and by the following statement:
This invention relates to steam engines and has for its principal object an
improved valve gear and cut-off connections adapted to provide means for a more
positive, close and accurate cut-off in what is known as the "Corliss method of
steam distribution" and thus to attain a much higher velocity than has been
possible through the use of a "drop cut-off" or similar mechanism. Another
purpose of my said invention is to provide in an improved manner for the actua-
tion of an oscillatory valve covering both induction and eduction that all the
events or positions of the said valve which controls the flow of steam into the
cylinder, excepting the cut-off, shall be positively maintained through the action
of a wrist plate that receives motion, primarily, from an eccentric on the main
engine shaft, while the movement for the cut-off mechanism is taken through a
cut-off lever almost directly from the cross-head of the engine, so that the cut-off
may be accomplished at the same position of the piston relative to the stroke for
both directions of its movement, the time of effecting the cut-off being regulated
by a governor. The resistance to the action of the governor may be increased
or decreased through the adjustment of a movable weight connected with the cut-
off mechanism so that while the throttle is quite open and the valve gear running
in its normal condition the engine may be set to run at any required speed.
Other objects and advantages of the invention will hereinafter appear with refer-
ence to the novel construction and arrangement of parts as hereinafter described.
In the accompanying drawings
Figure 1 is an elevation of a vertical compound engine showing in front view
the valve gear and cut-off connections.
Figure 2 is an elevation of the same at a right angle to the view shown in the
preceding figure.
Figure 3 is an enlarged view of the valve gear and cut-off mechanism.
Figures 4, 5, 6 and 7 are enlarged detail views of parts hereinafter referred to.
As shown in Figure 1, the reference numeral 1 designates the high pressure
cylinder and 2 the low pressure cylinder of a compound engine in which the
said cylinders are placed in such close and compact relation that simple and direct
steam passages will serve to connect the valves of the two cylinders. Each valve
at the high pressure cylinder is preferably to control both the induction and
eduction for that cylinder: and the exhaust from the high pressure cylinder
determines the lead of steam for the low pressure cylinder although the gearing
is as well adaptable to the ordinary relation of the valves to the cylinders as in
the original Corliss engine. The valves for both the high pressure and low
pressure cylinders are of a well known oscillatory type and their special con-
struction need not be shown or described. Although the drawings show a vertical
compound engine, it will be apparent that, without essential change in construc-
tion or action the valve gear and cut-off mechanism may be applied to either a

page_text: single cylinder or a two cylinder engine arranged either vertically or horizontally as
preferred.
For controlling or maintaining all the positions or events of the oscillatory
valve or valves, excepting the cut-off, there is provided a wrist plate 3 that receives
motion, primarily, from an eccentric 4 fixed upon the main shaft 5 of the engine
Figures 1 and 2. The eccentric rod 6 has its outer attachment upon a pin 7
carried by a cylindrical sliding block 8 Figure 7 that is adapted to move within
a cylindrical guide sleeve 9 fastened firmly upon the frame or housing of the
engine. This sliding block 8 carries also a più or bearing 10 located at right
angles to the pin 7 which connects with the eccentric rod. The pin 10 affords a
bearing or attachment for one end of a link 11 the other end of which connects,
through a pin or bearing 12, with the outer end of an arm 18 which is attached
to and gives motion to a rock shaft 14 mounted on the engine frame at right
angles to the main shaft. The rock shaft 14 carries another arm 15 Figure 1
with the outer end of which is connected the usual hooked rod 16 adapted to
connect with a stud 17 on the wrist plate 3 and through which the said wrist
plate receives motion from the eccentric on the main engine shaft.
That portion of the valve gear which is immediately about each valve stem 18
is set upon a bonnet 19 attached to the cylinder at each valve. There is keyed
to the projecting end of the valve stem 18 the collar portion of a crank arm 20,
Figures 1.3 and 5 immediately behind which is another collar 21 Figure 4 which
is adapted to oscillate upon a bearing at the end of the bonnet. This collar 21,
through a crank 22 thereon, receives movement from the wrist plate 3 by means of
a rod 23 which connects these parts. The said collar 21 has also fastened or cast
upon it an arm or spur 24 set in line with the outer end of the valve stem crank
arm 20 to which it is connected by means of toggle jointed links 25 and 26 the
centre joint of which carries a strong pin 27 having thereon an anti-friction
roller 28 that preferably engages and follows a curved groove or slot 29 in a
cut-off plate 30 set immediately behind the said links. Figure 5. This cut-off
plate 30 has its bearing upon the bonnet at the back of the collar 21 and its
movements are parallel with the movements of the collar crank-arm 22, valve-
arm 20 and their connecting links. The outer end of the valve arm or crank 20
is curved backward to bring it into direct line of movement with the arm or
spur 24 and in the direct line of force through the links 25 and 26, without
requiring off-set joints, and also to provide that the pin 27 with its roller 28
may run in the groove or slot 29 of the cut-off plate 30 with the least possible off-
set. The axis of movement of the cut-off plate 80, the arms 22 and 24 of
culiar 21 and the crank or valve arm 20 are identical with that of the oscillatory
valve and its stem. The are shaped groove 29 in the cut-off plate 30, through
which the roller 28 runs, is concentric with the axis of the valve through the
greater part of the length of said groove or slot, and it will be seen that as long
as the roller 28 is held in this concentric portion of the groove the crank 22
which receives movement direct from the wrist plate 3 and the crank 20 on the
stem of the valve must move exactly together; by which means the valve is
rocked or oscillated to the opening of the exhaust, back again to its closing, and
onward to the opening of the steam port, directly from the wrist plate move-
ments. Furthermore, the groove or slot 29 is so arranged that when the steam
port is fully open the roller 28 has passed, by easy change, into another portion
of the groove 29 constituting an are that is concentric not with the axis of the
valve stem 18 but with the centre of the pin making the joint with the link 20
upon the outer end of the crank or valve arm 20; this arc in the groove 29
having a radius of construction just equal to the length of the link 26 from centre
to centre of its joint pins. On reaching this changed are the roller 28 is carried
through it pressure from the spur 24 helping a ready expausion, and as the end
of the valve arm 20 is now exactly in the centre of the are through which the
roller 28 moves, while the connecting link 26 has the exact length of its radius,
the valve can no longer move, notwithstanding an onward movement of the spur

page_text: or arm 24 to its finish in that direction. The end of the crank or valve arm 20
necessarily keeps its position in relation to the centre of the arc in which the
roller 28 is moving, consequently, if the cut-off plate 30 is oscillated it will carry
the valve arm 20 with it, only changing the relative position of the roller 28
within the are of which the end of said valve arm is the centre.
Obviously the principle for control of the valve lies in keeping the middle
joint of the toggle-links (.e. the pin 27 therein) moving first in an arc, or nearly
an arc. concentric with the centre of the valve stem, until the valve is open, or
as nearly so as may be desired; after which it must pass through another arc,
eccentric with this but concentric with the centre of the pin upon the end
of the valve stem crank arm 20, the means for accomplishing this to be so con-
trolled by the governor, through the cut-off mechanism regardless of its particular
form, whether that of a plate with a groove in which a roller runs, or connecting
links and cranks, in the present construction a plate and groove being preferred,
that the cut-off and other movements of the valve may be controlled as described.
There is positioned upon the cut-off plate 30 a buffer 31 Figures 3 and 4
guarded by leather or other substance calculated to prevent shock, and so located
as to meet the valve arm 20 just before the position at which said valve arm comes
to rest through its decreasing motion controlled by the roller 28 as it passes
through a reverse are in the groove or slot 29 where the concentric and eccentric
portions of said groove are joined. This buffer 31 obviates all risk of strain in the
parts at the moment of cut-off which is brought about by a backward movement
or oscillation of the cut-off plate 30 actuated through connections which will be
hereinafter described. The cut-off plate is always in position to allow the
roller 28. to pass into the eccentric portion of the slot or groove 29 and thus
receive the valve crank 20 in its place of rest time enough before the beginning
of a stroke of the engine to ensure the valve its free opening by means of the
wrist plate movement; except when under emergency the cut-off has acted so
early as to prevent any opening of the steam port for that stroke. Upon the end
of the valve crank 20 reaching its position in the centre of the eccentric arc,
although the said crank or valve arm is now at rest in relation to the cut-off plate,
the roller 28 moves onward through the slot or groove 29 while the actuating
spur or arm 24 is permitted to approach the valve arm through toggle action of
the links 25 and 26, and, with a long cut-off, may even start to return in its
regular movement before the cut off through movement of the plate 30, which has
more rapid action-can take place. Under an extreme necessity the wrist plate
movement alone, acting through the links 25 and 26, may actuate the valve to
a closing of the steam port, through the cut-off being held very late in the stroke.
Therefore, as the time of effecting the cut-off, through movement of the plate 30
is regulated by a governor 32, Figures 1 and 2, I it may take place at any part
of the stroke, so determined, from its beginning to as near its end as the wrist
plate movement can properly effect that is to say, there is no interval between
the latest action of the cut-off mechanism proper and the closing of the valve as
effected by the wrist plate movement alone, at the end of the stroke.
The movement for the cut-off mechanism is taken as directly as possible from
the cross head 333 Figures 2 and 3 of the engine, that it may be not only simple
and direct in application, but also, which is of much importance, that the cut-
off may be accomplished at identical positions of the piston for both directions
of its movement with its own angular advance." This is impossible through
use of an eccentric for this purpose, as it has its own degree and time of angular
advance.
"
From the cross-head motion may be transmitted through a system of
levers 34, 35, 36, or an equivalent lever or levers and as directly as may be
practical to a cut-off lever 7 baving its bearing or fulcrum 38 at or near one
end. In the outer portion of this oscillatory cut-off lever 37 is a longitudinal slot 39
in which is carried a sliding block 40, controlled in position by the governor,
as presently explained. The block 40 carries a pin or centre 41 upon which are

page_text: pivoted links 42 leading off, at each side, to rocker-arms 43 that are fulcrumed,
as at 44, to the engine frame or cylinder housing. To the joint connections of
the links 42 and rocker arms 43 are attached connecting rods 45 leading to pins 46
upon rocker arms 47 which actuate the cut-off plates 30, one for each valve of
the high pressure cylinder in a compound engine, as shown; or, as in a single
cylinder engine, one for the valve at each end of such cylinder. These valves
each comprise both induction and eduction ports for its end of the cylinder. Cut-
off is always completed at an identical position of the rocker arm 43 and rocker
arm 47 no matter at what part of the stroke it may take place, and these rocker
arms are so arranged that if the sliding block 40 is down in the slot 39 cut-off
will come much sooner in the stroke of the engine than if the block be up; the
range of movement following such part of the whole stroke as may be desired,
from no admission of steam at all, to a coincidence with the closing of the valve
effected by the main gearing actuated from the wrist plate. It will be seen that
the connecting mechanism from the attachment at 41 on the sliding block 40, in
the cut-off lever 37, through to the gearing upon the valve stem, is so arranged
that only just such part of the whole movement of the cut-off lever-which is
coincident with that of the piston of the engine shall reach the valve as is necessary
to effect the cut-off or closing of the steam port, the remainder being lost motion
as regards the movement of the cut-off plate 30 this lost motion being taken from
one limit or the other of the movement of the rocker arm 43 and rocker arm 47
according to the position of the block 40 in its slot 39; the links 42 and connecting
rods 45 having certain parts of the movement of their ends through ares in
which they swing while conveying little or no movement to the cut-off plate.
This concentration of the movement of the cut-off plate 30 to just the limit
necessary to accomplish the cut-off, is greatly helped by reason of the connection
between the rocker arm 47 and the plate 30 taking place through reversed and
intersecting arcs and with a sliding movement, (through parts hereinafter
described) which also secures, aided by the connecting rod action, an easy and
gradually increasing motion for the cut-off plate from its position of rest to a
rapid completion of the cut-off, and then a gradual diminution of motion to its
second point of rest. The effect of this action is to make the cut-off very quick
at its finish avoiding wire drawing, and of exact degree at whatever part of
the stroke it may occur; the whole cut-off mechanism being at the same time,
easy running and operating with great smoothness, freedom from wear and with-
out shock either in starting the movement of the plate 30 or in bringing it to
rest.
The rocker arm 47 has upon its outer end, beneath the plate 30. a hearing 48
Figures 4 and 5 which holds a loose pin 49 having formed upon its end outside
the said bearing and nearest the plate a groove or guideway 50 which fits smoothly
and slidingly upon a bar or rod firmly attached to the back of the cut-off
plate 30, the object being to provide a smooth and free sliding connection between
the cut-off plate 30 and the rocker arm 47 which will permit the end of said
rocker arm to act in its reversed are upon proper movement of the cut-off plate.
The proper degree of movement of the cut-off plate 30 is concentrated, from the
longer are of movement of the cut-off lever 37, through the rocker arm 48, at its
lower limit of movement, in consequence of the movement of rod 45 as it
approaches (or even passes) the rocker arm fulcrum 44; and at the upper limit
of movement in said rocker arm 43, in consequence of the arrangement of parts by
which its relation to the cut-off lever 37 is changed through upward or outward
movement of the sliding block 40; also through the rocker arm 47, by which
the cut-off plate 30 18 immediately actuated, in consequence of the arc of movement
in said rocker-arm being opposed to that of the bar 51 secured to the said cut-off
plate which, through the sliding motion of guide 50 upon the bar 51, provides
à gradual diminution or acceleration, of the movement of the cut-off plate, which
may at extremes, even bring it to rest while the rocker arm 47 still moves. The
attachment of the rocker arm 47 to the connecting rod 45 is shown at 46 as separate

page_text: from the pin 49 and its bearing 48 but it is obvious that if desired these parts
may be arranged coincident.
In a vertical compound engine, as shown, the rocker arm 47 at the upper
steam valve is supported from a bracket arm 47ª, Figure 2, adjacent to the stem 18
of that valve. At the lower steam valve, the rocker arm 47 is more conveniently
fulcrumed to a projection of a collar 47 on the end of the bonnet from which
projects the stem 18 of the adjacent lower exhaust valve, as clearly shewn in
Figure 5.
The sliding block 40, in the slot 39 of cut-off lever 37, is connected by means of
a link or rod 52 Figure 6 to another sliding block 53 engaged in a sloi 54 Fig. 1
near the fulcrumed end of the cut-off lever. This block 53 has a similar longi-
tudinal movement with the connected block 40, the two thus being made coincident
in action. In the sliding block 53 is a groove 53" preferably made in the form of
an arc for ease of connection with one end of a two armed lever 55 fulcrumed at 56;
Figures 1 and 2 on the engine frame. The other end of this two armed lever 55
connects through a link 57 with one end of a two-armed lever 58 fulcrumed at 59
and arranged substantially at a right angle to the first named lever 55 which
immediately connects with the slide block 53 of the cut-off lever. One end of the
lever 58 connects, through the rod 60, with the governor mechanism 32, as
shown. Through this or a similar connection with a governor mechanism the
sliding blocks 40 and 53 are drawn downward for an earlier cut-off and pushed
upward for a later cut-off, while the are groove 53 in the sliding block 53
permits free movement of the cut-off lever 37 without disturbance to this
regulation of position for the said sliding blocks. The position of the sliding
block 40, in the slot 39, determines the point in the stroke of the engine at which
the cut-off shall take place for both ends of the cylinder, the two links 42 acting
equally. The connections to the governor may be varied so as to be more or
less direct according to circumstances even to a direct connection with sliding
block 40, but in any case they should be balanced so that the work upon the
governor shall be as light as possible, and equal in degree whether the block 40
be moved upward or downward. As the movement of the connections on one
side of the fever is effecting a cut-off for their end of the steam cylinder, those
of the other side are, by reverse movement, restoring the cut-off plate 30 to its
original position for the beginning of another stroke. One of these actions presses
upward or outward upon the block 40 while the other draws downward or inward
upon it; thus with such correction for balance as may be necessary they neutralize
each the action of the other as regards movement of the block 40 and leave it free
to easy regulation by the governor.
To provide for increasing or decreasing the speed of the engine through an
increase or decrease in the resistance to the action of the governor as exerted
through the cut-off mechanism, there may be placed intermediate the governor
and the cut-off a movable weight 61 Figures 1 and 2 suspended, for instance,
from the lever 58 in such a manner as to be capable of adjustment toward and
from the lever fulcrum. By adjustment of this weight 61 upon its supporting
lever the speed at which the engine is to run will be increased through increasing
the resistance against action of the governor, by a movement outward of the
weight upon the lever: and, conversely, the speed will be decreased by decreasing
that resistance through an adjustment of the weight inward. The same effect and
action may be obtained through use of a spring, or other similar means of
increasing and decreasing the tension upon the lever. In this manner though the
throttle is full open and the valve gear running in its normal condition, the engine
may be set to run very slowly while warming up and waiting for its work, and be
then started into full action and speed simply by moving the weight 61 to its
proper position upon the lever.
In a compound engine the wrist plate 3 will be connected by rods 62 to rigidly
attached arms 633 on the stems of the low pressure valves.
Throughout the engine, whether constructed with one or more cylinders, either

page_text: vertical or horizontal, there is a perfect balancing, as by part against part where
practicable, or by counter-balance, if necessary.
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. In an engine, the combination with an oscillatory valve controlling both
induction and eduction, and a valve gear comprising a wrist plate and connections
actuated from an eccentric on the main engine shaft, of governor controlled cut-
off mechanism actuated from the movement of the cross-head and piston rod of
the engine, whereby a variable ent-off is effected at the same position of the
piston relative to the stroke for both directions of its movement and at any point
of the stroke, substantially as described.
2. In an engine, the combination with a valve, and a valve gear comprising a
wrist plate and valve connections actuated from an eccentric on the main engine
shaft, of a cut-off lever having direct connection with and actuated from the
movement of the piston rod and engine cross-head, a governor controlled slide
block carried by said cut-off lever, a cut-off plate in toggle-link connection with
the valve gear and its wrist plate, and connecting mechanism from the governor
controlled slide block to the said cut-off plate, substantially as described.
3. In an engine, the combination with a valve, and a valve gear comprising a wrist
plate actuated from an eccentric on the main engine shaft, of a cut-off lever actuated
from the movement of the cross-head and piston rod of the engine, a governor
controlled slide block carried by said lever, a slotted cut-off plate, a collar having
two arms to one of which is attached a connecting rod from the wrist plate,
toggle-links connecting the other arm of said collar to a rigid arm on the valve
stein, a roller at the connecting joint of said toggle-links and engaged in the slot
of the cut-off plate, and lever connections from the governor controlled slide block
to the cut-off plate, substantially as described.
4. In an engine, the combination with a valve, the valve gear, and wrist plate
connections, of a cut-off lever actuated from the movement of the piston rod and
engine cross-head, a governor controlled slide block carried by said cut-off lever,
a cut-off plate having a slotted portion in toggle link connection with the valve
gear and wrist plate, a rocker arm having a pivotal link connection with the
governor controlled slide block, a rocker arm slidingly connected with the cut-
off plate, and connecting rods between the said rocker arms, substantially as
described.
5. In an engine, the combination with a valve, the valve gear, and its wrist
plate, of a cut-off lever actuated from the movement of the piston rod and engine
cross-head, coincidently acting slide blocks carried by said cut-off lever, a cut-off
plate actuated from one of said slide blocks and in variable connection with the
valve gear and wrist plate, a governor having lever connections to the other one
of said slide blocks, and a movable weight supported by said lever connections
and adjustable thereon to vary the resistance to the action of the governor through
the cut-off mechanism and thereby control the engine speed, substantially as
described.
6. In an engine, the combination with a valve, the valve gear, and its wrist
plate, of a rock shaft provided with two arms one of which has an actuating
connection to the said wrist plate, a guide sleeve rigid on the engine frame, a
slide block arranged in said sleeve and provided with two pins or pivot bearings
at right angles to each other, a link connecting one of said pins to an arm of
the said rock shaft, and an eccentric rod connecting the other of said pins to an
eccentric on the engine shaft, substantially as described.
7. In an engine, the combination with an oscillatory valve having its stem
provided with a rigid crank arm, of an oscillatory collar mounted concentric
with the axis of said valve and provided with two arms one of which is in line
with the outer end of the valve arm, toggle links connecting said collar arm and

page_text: valve arm, a connecting rod between the other collar arm and a wrist plate that is
actuated from the engine shaft, a cut-off plate having a slot that is concentric
for the greater part of its length with the axis of the valve and for the remainder
of its length concentric with the pin that makes connection between the outer
end of the valve arm and one of said toggle-links, a roller engaged in said slot
and mounted on the joint that connects the two toggle-links, and governor con-
trolled mechanism connected with the said slotted cut-off plate and actuated from
the engine cross-head, substantially as described.
8. In an engine, the combination with an oscillatory valve having its stem
provided with a rigidly attached crank arm, of an oscillatory collar mounted
concentric with the axis of said valve and provided with two arms, toggle links
connecting one of said collar arms with the valve arm, a connecting rod between
the other collar arm and a wrist plate, a cut-off plate having an are slot that is
partly concentric with the valve axis and partly eccentric thereto, a roller engaged
in said slot and mounted on a pin at the joint connection of the two toggle-links,
a cut-off lever actuated from the movement of the piston rod and engine cross-
head, a governor-controlled slide block carried by said lever, and connections from
said slide block to the cut-off plate, substantially as described.
9. In an engine, the combination of a wrist plate actuated from an eccentric on
the engine shaft, an oscillatory valve, a valve gear through which the valve is
oscillated to the opening of the exhaust then back again to its closing and
onward to the opening of the steam port directly from action of the wrist plate,
a cut-off plate having slot and toggle-link connection with the valve gear and
wrist plate, and governor controlled mechanism connected with said cut-off plate
and actuated from the movement of the engine cross-head, substantially as
described.
10. In an engine, the combination of an oscillatory valve, a wrist plate, valve gear
through which the valve is oscillated to the opening and closing of the exhaust
and onward to opening of the steam port directly by action of the wrist plate, a
cut-off plate having slot and toggle-link connection with the valve gear and
wrist plate, and governor controlled mechanism for effecting cut-off through said
plate at any point in the stroke and without interval between the latest action of
the cut-off plate and the closing of the valve by wrist plate movement, substantially
as described..
11. In an engine, the combination of an oscillatory valve, a wrist plate, valve
gear actuated from said wrist plate for controlling induction and eduction through
said valve, a cut-off plate having variable slot and toggle-link connection with the
valve gear and wrist plate, a cut-off lever actuated from the movement of the
piston rod and engine cross-head, a governor-controlled slide block carried by
said lever, and rocker mechanism having a pivotally linked connection with said
side block and a sliding connection with the cut-off plate, substantially as
described.
12. In an engine, the combination with a valve, a wrist plate, a valve gear,
and cut-off plate, of a slotted cut-off lever, coincidently acting slide blocks carried
in the slots of said lever, rocker mechanism connecting one of said slide blocks
with the cut-off plate, the other one of said slide blocks being provided with an
arc groove, and a lever having one end slidingly engaged in said are groove and
its other end connected with a governor mechanism, substantially as described.
13. In an engine, the combination with a valve, a valve gear, and a variable
cut-off, of an oscillatory cut-off lever, coincidently acting slide blocks carried by
said lever and connected with each other by a link or rod, connections from one
of said slide blocks to the cut-off proper for concentration of motion upon only
the necessary movement of the cut-off, and governor mechanism connected with
the other slide block, substantially as described.
14. In an engine, the combination with a valve and valve gear, of governor
controlled cut-off mechanism actuated from the movement of the cross-head and

page_text: piston rod of the engine, the said cut-off mechanism comprising means for effect-
ing concentration of motion upon only the necessary movement of the cut-off,
substantially as described.
15. In an engine, the combination with a valve, and valve gear actuated from
the engine shaft, of a governor controlled cut-off mechanism actuated direct from
the movement of the cross-head and piston rod of the engine, with provision for
concentration of motion upon only the necessary movement of the cut-off, sub-
stantially as described.
16. In an engine, the combination with a valve, and valve gear, of an oscil-
latory cut-off lever, a governor controlled slide block carried by said lever, and
a variable cut-off controlled from said slide block with provision for concentration
of motion upon only the necessary movement of the cut-off, substantially as
described.
17. In an engine, the combination with a valve, and valve gear through which
the valve is actuated to the opening and closing of the exhaust and onward to
opening of the steam port, of a variable cut-off, a governor for controlling the
cut-off, and means for varying the resistance to the action of the governor through
the cut-off mechanism to thereby control the engine speed,” substantially as
described.
18. In an engine, the combination with a valve, and valve gear, of a variable
cut-off operating partly in an are concentric with the valve stem and partly in an
are eccentric thereto, an oscillatory cut-off lever, a slide block carried by said lever
and having link and rocker-arm connection with the cut-off proper, the said
connection being arranged for concentration of motion upon only the necessary
movement of the cut-off a governor for controlling the slide block movement, and
means for varying the resistance to the governor action through the cut-off
mechanism, substantially as described.
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HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.