IMPROVEMENTS IN VALVE GEAR OF STEAM ENGINES."
Year: 1881

page_text: LETTERS PATENT to George Lewis Lambert, of the Town and County of
Nottingham, Engineer, for an Invention of "IMPROVEMENTS IN VALVE GEAR
OF STEAM ENGINES."
PROVISIONAL SPECIFICATION left by the said George Lewis Lambert at
the Office of the Commissioners of Patents on the 22nd July 1881.
GEORGE LEWIS LAMBERT, of the Town and County of Nottingham, Engineer.
"IMPROVEMENTS IN VALVE GEAR OF STEAM ENGINES."
My Invention relating to improvements in valve gear of steam engines has
reference to that type of steam engines and valve gear for which Letters Patent
were granted to me on the 20th November 1877, No. 4340, and consists in the
employment of piston valves for controlling separate steam and exhaust valves
provided at each end of the cylinder. Each valve works in a separate chamber
and is actuated and governed by suitable valve gear having either rectilinear
motion parallel with the valve connecting rod or angular or radial movements
thereto, and so arranged as to effect the required cut off and expansive working of
the said valves.
According to my present Invention I arrange the main double end bell crank
or rocking lever disc or quadrants (formerly placed to work in front of the exhaust
valve spindles) to vibrate and rock on the before said exhaust valve spindles
together with the small single end rocking detent levers, hereinafter described.
And together with these are carried the steam and exhaust cams (also therein-
after described), free to vibrate or move forwards and backwards, and which are
not fastened or secured on to the said exhaust valve spindles, but are "axially
perfectly loose to work radially and vibrate independent of the single sided double
levers fixed thereon according to the motion imparted from the main eccentric.
But the said single sided double levers move on the valve spindles and are so
arranged as to form single end double sided levers constructed either in two parts
each with joints at suitable positions either at center or sides of levers which are
DL 077

page_text: properly bolted and secured together in such a manner as to form one single double
sided lever for the steam valves, and one single end double sided lever for the
exhaust valve respectively. These levers have bosses of suitable form placed on
the same face or surface as the detents of either steain or exhaust levers, and are
made to work one within the other (the exhaust lever boss inside and the steam
lever boss outside), but each free to vibrate separately and independent of the other
single end double sided exhaust lever, being fixed or secured permanently to the
exhaust valve spindle, as before described. But the said single end double sided
steam lever and the said single end double sided exhaust lever have both other
similar bosses arranged on the saine side or surface of the detents of either steam
or exhaust levers and formed in such a manner as both together within each to
grasp the centre of the main double end bell-crank or rocking lever disc or
quadrant, and the whole is thus caused to interlock one and within each other;
or, in other words, the double end bell crank or main rocking lever disc or quadrant
is placed centrally between the said single end double sided levers of both steam
and exhaust gear so as to provide firm but workable grasp of both levers together
with and within the centre of the said double end bell crank lever or main rocking
lever disc or quadrant so as to prevent undue or irregular sided wear of the depths
of the respective detents. The outside bosses of the said single end double sided
levers respectively can be placed inside or on the same face or side or surface of the
main detents of the steam or exhaust levers, and when so placed together the said
bosses will grasp one within each other, and the whole within the centre of the
double end bell crank rocking lever or disc or quadrant.
For the purpose of altering the position of the small single end detent rocking
lever from the inside of the main double end bell crank or main rocking lever and
shaft to the outside surface or face of the double and bell crank or main rocking
lever disc or quadrant I place them in such a suitable position as to be right and
left of each other on the vertical centre line with the detent rocking lever and shaft
and radially with the centre of the said main double end bell crank or rocking lever
disc or quadrant. I now purpose to fix the said detents together with the small
ended rocking lever which works the same, all being fixed in a separate box or die
hereafter called the detent holder, and which is now made separately and loose
from the bell crank dise or quadrant, and is formed in such a manner as to be all
removable and replaced easily and firmly secured with bolts to the face, and in a
recess provided in the said double end bell crank or main rocking lever disc or
quadrant. One small detent single end rocking lever engages or releases the detent
of the steam valve, and the other small single end detent rocking lever similarly
operates the detent of the exhaust valve. Being thus fixed on the surface or face
of main double end bell crank or main rocking lever disc or quadrant, the said
small single end detent levers placed axially and radially and are free to move up
and down or vibrate to the position required. At the long end or opposite end to
-the rocking shaft of the small single end detent lever are fixed rollers which are
secured by pins to the lever, aud are consequently free to pass over the periphery-
of the cam projections hereinafter mentioned. The small single end detent rocking
levers hereinbefore.described have therefore a rocking motion given them
separately owing to the radial action or vibratory motion of the said double end
bell crank or main rocking lever and gear. The suitable motion is imparted by
the eccentric or other similar motion, leading the crank over the engine centres,
where by this leading or "linear" motion of the double end bell crank or main
rocking lever and connections is utilized to enable the said small single end detent
levers to receive early motion, and whereby the before said cams are brought into
action so as to enable the steam valve to be released early from the detent, and
thus obtain an early cut off.
The exhaust valve spindles are so lengthened or prolonged as to carry the said
double end bell crank main rocking lever and the steam and exhaust cams
above mentioned, and on which the whole of the working gear is fixed.

page_text: Another part of my Invention relates to the radial, detaching, and cut off
apparatus for regulating and releasing or engaging the before mentioned detents.
I propose to remove the two said exhaust cams and fix one of them axially on
each of the exhaust valve spindles in front of the said double end bell crank or
main rocking lever disc or quadrant spindles, and also provide other two cams of
similar form to those above mentioned, and fix them side by side "axially" with
each and in front of the exhaust cams on the said exhaust valve spindles. The
position of either of the cams can be varied, but in this case the steam cam is
placed in front and exhaust cam next to the main bell crank rocking lever disc or
quadrant. Thus each separate exhaust valve spindle carries one stean and one
exhaust cam, each of the said cams being capable of receiving separate and distinct
motion hereinafter described.
The two stean cains have projections on their peripheries of such suitable form
and size as to lift up or cause the small single end detent lever to vibrate at the
proper intervals, the rollers on the lever before mentioned following the projections,
and thus releasing the detent connected with the steam valves.
The small single end rocking lever for releasing or engaging the exhaust valve
detents have also a similar motion imparted to them as those of these steam cams,
but are not under the control of the governors hereafter described.
The said two steam cams are operated on and receive their vibratory motion
from a double ended rocking lever and shaft placed. vertically and at such suitable
horizontal centre of the double end rocking lever that the motion of the same is
equally divided off the vertical line midway between the main valve spindles. On
the top end of the said double ended rocking lever a pin is centrally fixed in an
eye, and on which a small disc or double ended bell crank is secured, capable
of moving freely with the vibratory motion of the double ended lever, and
which double ended bell crank or disc has a vibratory motion given it from the
double ended lever, and is thus free to vibrate freely and independently of and
jointly with the same. On this disc or double end bell crank are provided three
pins, two in a vertical line and the third at right angles, thus forming, as commonly
called, a "double end bell crank lever," and to the top and bottom of the pins on
the said disc or double end bell crank lever are connected coupling rods which are
also connected to the right and left of the before mentioned steam cams, the
coupling rods being free to move in a horizontal direction to suit the vibratory or
otherwise oscillating action of the cams and double end bell crank or disc on the
said double end vertical lever and shaft just mentioned.
On the bottom ends of the double end vertical lever is also a pin and eye, and
to which is coupled a rod also leading to and connected to the main detaching
rocking lever and shaft on piston rod or other parts producing similar motion.
Thus a constant vibratory motion is imparted from the main detaching rocking
lever to the said vertical double ended lever, which reciprocating motion is
transmitted to the said double end bell crank or disc and thence to the steam cams
by the said coupling rods.
On the third pin of the small disc or double ended bell crank lever is connected
the governing apparatus attached by a coupling rod, whereby the small disc or
double ended bell crank is held under command of the motion of the governor,
and so depressing or raising the double end bell crank lever or disc as to alter the
position of the projections on the steam cams. The position of the said cams are
thus caused to alter or vary from time to time as the speed and load of the engine
may require, so as to produce an early or late cut off as described, thus automatically
and uniformly governing, controlling, or regulating the steam valve and supply
under all fluctuating circumstances.
It may here be noticed that by the small "inner" single end detent lever
attached to the disc box or before named detent holder which is secured to the,
ace of the main rocking lever double ended bell crank disc or quadrant, the linear
advance of the eccentric is taken advantage of, and also by the peculiar action and.
ibratory motion of the said cams a double meeting motion takes place in such a

page_text: manner as to hasten the release of the small rocking detent lever, and thus release
the steam valve detents.
This hastening of the release is effected by the small single end detent lever,
radially which moves forward with the main double ended bell crank or main
rocking lever disc or quadrants separately from the said steam cams, but the said
steam cams also move and have a forward motion in an opposite direction to the
small single end detent lever, and thus the projections on the cams meet and engage
the single end detent lever.
The two exhaust cams also receive their motion through the intervention of
coupling rods connected right and left to each separate exhaust cam, similar to the
steam cams already described, and in such a suitable place that the rods are free to
travel horizontally in either direction with the.motion of the said double end
rocking levers.
The rods are coupled to the continuation of the central pin before named
on the vertical double ended rocking lever, also before mentioned, which projects
in such a manner that the coupling rod eyes are fixed and jointed thereon, so
as to be able to move freely horizontally to impart motion to both the exhaust
cams.
The desired and necessary cushioning of the exhaust valves is effected by simply
lengthening or shortening the before said coupling rods by means of adjusting
boxes, which so alter the position of the projections on the said cam, and thus
accomplish the release of the small detent rocking lever, whereby the exhaust
detents are released and the exhaust valve close.
In order to more effectually govern or control the action of the rectilinear cut
off gear also described in the Specification to my before named Letters Patent, I
now provide an arrangement of suitably formed angular parallel projections, tappet
rod or rods (of any acquired number), having angular parallel projections of suitable
depths formed thereon, and so continued in a parallel manner or relation, of and
such a desired length suitable to the stroke of either the cut off motion or governors.
The angular parallel projections are similar to those of the before described steam
cams. The said angular formation or tappet rods are applicable to either "Cornish
valve gear, or commonly called Corless valved engines, or any other similar kind
of valve gear in which the cut off motions are analagous to those hereinbefore
described. For each separate cut off motion only one angular parallel projection
or tappet rod is used, and one angular parallel projection or tappet rod for each
separate exhaust valve cut off gear for either engaging or disengaging the small
single end detent rocking lever hereinbefore described.
"
In the present arrangement the angular parallel projection or tappet rods are
placed in a vertical position relative to and according to that off the cut off gear,
and is at all times parallel with the centre line of the same, whether the latter
is placed vertically or horizontally; and the said tappet rods have requisite eyes
-and-slotted crossheads, and work in suitably formed guides or other appliances, and
usual adjusting boxes (for lengthening or shortening the angular-projections -or-
tappets, by which we can vary the rate of cut off according to the requirements
of the load of the engine. On the before mentioned angular parallel projection
of the tappets the small single end rocking detent lever is made to work on, and
on the outer end or opposite to that of the rocking shaft of this lever are rollers
similar as those on the previously mentioned levers with radial detaching gear, or
in lieu thereof a pointed end is provided of such form as to follow the angular
parallel projections. The action of the gear is such that when the small single
end rocking detent lever travels upwards or forwards according to the rectilinear
motion it engages a certain indefinite intervals, according to the action of the
governors with the said angular parallel projections, which travelling also in a
contrary or opposite direction at all times to that of the small single end rocking
detent lever, and so producing a double meeting motion for disengaging or releasing
the detents of either the steam or the exhaust valves.
According to another modification the tappet rod is in line with the angular

page_text: parallel projections, the angular form of the projection is dispensed with, and in its
stead a square detent or catch of suitable depth is provided so as to form a
bite. In this bite the before named small rocking detent lever engages, and is
placed always at right angles to the tappet rod. The outer end of the latter is
made of such form as to engage in the said detent catch or bite, the motion of the
small rocking detent lever and that of the tappet rods remaining the same as
before described, the parallel surface of the said tappet also remaining the
same.
The before named angular parallel tappet rods have a motion given them from a
separate or double end lever, or other suitable arrangement of levers.
"
66
The present rectilinear cut off motion detaching gear is arranged to be fixed on
Cornish" valved engines, or commonly called stamper valve" engines, and
generally where the steam valve cut off motion gear is placed in pairs vertically
side by side and parallel with each other at suitable distances.
The before named angular parallel projecting tappet rods are made at suitable
lengths, and at the bottom ends of which are placed the usual single eyes or slotted
crosshead adjusting box. Those single eyes or slotted adjusted boxes are separately
attached and jointed workably to the separate ends of either a double ended bell
crank centre rocking lever, or a straight double ended outer rocking lever, in the
centre of which levers is placed a central rocking pin or shaft, and to which
central rocking pin is attached either a single ended rocking lever or bell crank
lever, according to position and circumstances.
This single ended rocking lever or bell crank lever is suitably attached by either
a weigh shaft or connecting rods to the engine governors, and by which the
governors control the entire action of the tappets which release the detents of the
steam valves according to the speed and load of the engine, and by which the engine
is automatically controlled.
On central pins the before named double end rocking bell crank or double ended
straight rocking lever is made to move freely, and equally divide the vibration in
an horizontal direction independently of the before named single end governor
lever and of any other action of the governor.
To the upper end of the double ended centre bell crank before named is attached
the connecting rod or coupling rod from the main detaching rocking lever, and
which thus imparts motion to the said double ended centre bell crank or straight
lever before mentioned, so as to move and work the before named angular parallel
projecting tappet rods in the desired vertical direction, or upwards and downwards
at all times alternatively and separately or independently of that of the governors,
and accordingly the position of the said rectilinear cut off motion. Thus a double
meeting motion is produced and transmitted for disengaging the detent of the said
steam cut off gear.
At the
Another arrangement for worthy the said angular parallel projecting. tappet
rods can be used and provided in lieu of the above described form. According to
this arrangement we substitute a set of double mitre toothed quadrant centre
locking levers; thus at one end is provided a single eye on the said centre lever,
and to which is attached the said tappet rods, and at the opposite end is suitably
formed quadrants tothed, mitred, and forming both a single eye lever.
opposite end a toothed mitre quadrant of such a form is employed and placed at
such parallel distances from each other as to allow a third middle toothed mitre
quadrant to be placed between the said quadrant, and which gear into each
other. The before said quadrant toothed mitre rocking levers are placed too freely
vibrate upwards and downwards and at all times alternately and separately and
independently from that of governors, and are fixed in position on on the governor
rocking shaft or similary acting on rocking weigh shaft, but not fastened or
secured thereon, but are left loose to vibrate according to motion required to the
before named middle toothed mitre quadrant lever, which is placed on and made
to vibrate equally on a central lever pin.
The central lever pin is fastened or secured and keyed on the said governor,

page_text: weigh or rocking shaft, and by which the governors control the entire action and
position of the tappets, and thus release or disengage the detents of the steam
valves, whereby the engine is automatically governed or controlled at all times, so
as to compensate for variations in the speed and load of the engine.
A pin is also suitably placed in the said middle toothed mitre quadrant, and to
which pin the coupling rod of the main detaching rocking lever is attached, thus
giving an equally divided vibrating motion alternately, separately, and
independently of the governors, thereby producing a double meeting motion of
the before named angular parallel projection tappet rods, and thus release the
steam or exhaust valve detent, so as to give easy and regular cut offs as required by
the governor.
According to another arrangement provided and which is applicable to the use
of the rectelenier cut off, detaching regulating gear when applied for the use of
commonly called "Corliss valves," or other valves which contain separate steam
valves and two separate exhaust valves, the rocking valve spindle of which are
placed at right angles with main centre line of the engine. In this case the two
steam cams and two exhaust cams all situated on the exhaust valve spindles
before said are dispensed with, and the before described angular parallel projection
tappet rods provided in their stead and give motion to the saine.
Two separate single ended rocking levers are provided for the use of the steam
tappet rods, and two similar separate single end rocking levers are provided for the
use of the exhaust tappet rods. Should the cut off gear be used for the exhaust
valves, which single end rocking levers are placed each separately at right angles
to each separate angular projecting parallel tappet rods, and are placed and joined
at the bottom thereof by suitable pins and eyes to the said single and rocking
levers before described.
Motion is now imparted to each of those separate single end rocking bell crank
levers by being joined, and in all other respects attached to and worked by the
before described radial detaching and cut off regulating gear coupling rods, all of
which gear on, and parts thereto belonging are applicable for use and work on the
said rectelinear cut off detaching gear before named, with the exception of the
before mentioned omitted two steam cams and two exhaust cams.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
"
by the said George Lewis Lambert in the Great Seal Patent Office on the
21st January 1882.
GEORGE LEWIS LAMBERT, of the Town and County of Nottingham, Engineer.
IMPROVEMENTS IN VALVE GEAR OF STEAM ENGINES."
My said Invention relating to improvements in valve gear of steam engines has
reference to that type of steam engines and valve gear for which Letters Patent
were granted to me on the Twentieth November, One thousand eight hundred and
seventy seven, No. 4340, wherein piston valves are employed for controlling
separate steam and exhaust valves provided at each end of the cylinder, each valve
working in a separate chamber, and actuated and governed by suitable valve gear
having either rectilinear motion parallel with the valve connecting rod or angular
or radial movements thereto, and so arranged as to effect the required cut off and
expansive working of the said valves.
According to my present Invention which has chiefly for its object the more
simple, compact, cheap, and effective construction, arrangement, and combination of
such type of valve gear, I arrange the main compound double armed rocking levers
(termed in my aforesaid previous Specification "segmental levers," which for
convenience may be in the form of bell crank, discs, or quadrants (formerly
placed to work on the front end of and horizontally opposite to the exhaust valve
spindles), to vibrate or rock axially on the said valve spindles together with the
small rocking detent levers, in the manner hereinafter more fully described.
On the same spindles and together with the aforesaid levers are carried the
steam and exhaust cams, which are arranged free to rock, axially vibrate, or move
forwards and backwards (not fastened or secured on to the said exhaust valve
spindles), but are arranged perfectly loose so as to work or vibrate independently
of the levers, discs, or quadrants fixed thereon, which are actuated by a continually
reciprocating motion imparted to them from the main eccentric. The compound
double armed rocking levers arranged on the exhaust valve spindles are formed
virtually of two single end and "double sided levers" constructed either in two
parts, each with joints at suitable positions which are properly bolted and secured
together in such a manner as to form actually one "single end double sided lever'
for the steam valves, and one "single end and double sided lever" for the exhaust
valves respectively. These levers have bosses of suitable form placed on the inner
or same face or surface as the vibrating main compound rocking lever, quadrant, or
disc that carries the detents of both the steam or exhaust levers, and are made to
work one within the other, in the manner hereinafter more fully described.
35
These two parts of the aforesaid compound rocking lever are arranged free
to vibrate separately and independently of each other, the exhaust half or single
lever being fixed or secured permanently to the exhaust valve spindle, as before
mentioned, while the steam half or single lever is mounted loose and free thereon.
Both the single exhaust and steam levers forming the compound rocking
lever have other similar bosses arranged concentrically and cylindrically on their
inner sides in such a manner as to allow both to grasp or encircle each other on
the said exhaust valve spindle, by which they are caused to interlock each other
SO as to prevent undue or irregular wear, as will bereinafter be more fully
explained.
The two small detent rocking levers are mounted on similar fulcra arranged on
either side of the exhaust valve spindle, and carried by the "detent disc," bell
crank, or quadrant arranged to work within the main compound rocking lever, as

page_text: previously mentioned; or they may be carried by the arms of the compound
rocking levers aforesaid.
The detent lever is provided to engage or release the detent of the steam valve,
and the other similarly operates the detent of the exhaust valve.
•
The detent apparatus controlling the valves and actuated by the aforesaid small
rocking levers is contained in a box or holder suitably carried by the said detent disc
or quadrant or arms of the compound rocking lever. This detent apparatus is so
arranged in suitable connection with the piston rod of the engine that at
determined portions of its stroke the detents are caused to disengage or engage in
suitable bites or notches, so arranged as to impart the reciprocating motion of the
detent disc bell crank or quadrant received from the main eccentric to the steam or
exhaust valves. When the valves are released they return to their normal position
by their own weight, their fall being retarded by dash pots in the ordinary and
well known manner.
The detent apparatus is caused to intermittently disengage the exhaust or steam
valve rods by virtue of an intermittent radial reciprocating motion imparted to the
before mentioned cams by means of suitable rods operated by the piston rod, which
cause the small detent levers to withdraw the detents from the engaging the bites
or notches, and thus release the valves.
The arrangement of mechanism by which this disengaging or detaching action
or "tripping out" of the detents is effected I designate the "radial detaching gear"
от I cut off apparatus." This gear consists of rods attached at their own ends to
the steam and exhaust cams, whilst their other extremities are connected to a disc
or bell crank mounted on a single or double end lever, which receives a constant
reciprocating motion from the piston rod of the engine or equivalent motion thereto.
The said disc or bell crank is prevented under ordinary circumstances from turning
about its point of suspension by means of a rod in connection with the governing
apparatus.
By this means the lever disc or bell crank and its detaching rods and gear are all
caused to vibrate or travel to and fro in one direction at a uniform and definite
proportion of speed to that of the piston.
When any irregularities or fluctuations take place in the speed, working, or load
of the engine, so as to require the interference or assistance of the governing
mechanism, motion is imparted to the before mentioned rod, which causes the
vibrating disc or the bell crank and gear to turn bodily about its axis, operating
on the steam cams and detent levers, and thus suddenly and effectually controlling
the admission or egress of the steam to or from the cylinder.
It will now be understood that the detent disc bell crank or quadrant axially
mounted on the valve spindle has a constant vibratory motion impartod to it in
one direction by the main eccentric on the engine shaft, while the steam and
exhaust cams, also carried by the same spindle, receive a similar motion from the
piston rod (or its equivalent) in-the-opposite-direction._.
For simplicity only, one set of valve gear at one end of a steam cylinder has
been described, but it will be obviously understood that exactly the samne elements
or parts exist at the other end of the cylinder for controlling the admission and
egress of the steam at the opposite side of the piston. The motion for operating
both sets of gear motion is derived from the same sources, that is, a transverse
coupling rod or cross bar worked by the main eccentric is provided to impart motion
to both detent discs, bell cranks, or quadrants, while motion is communicated to the
two sets of steam and exhaust cams arranged on counter spindles by means of
duplicate sets of detaching rods connected with the before mentioned disc or bell
crank carried by the aforesaid vibrating lever.
According to one arrangement it is found convenient to arrange the aforesaid
lever and disc in a position to vibrate midway between the two sets of valve gear,
but it will be readily understood that they might be arranged to similarly operate
in any other convenient position without changing the arrangement of the parts
connected thereto or affecting their action or movements thereof.

page_text: The governor and detaching gear rods are provided with suitable adjusting
couplings or boxes, so as to enable the projections on the before mentioned cams to
be readily adjusted according to the time or intervals at which they may be desired
to operate.
According to another or a modified arrangement of my said Invention I provide
tappet rods with angular parallel projections formed thereon for governing or
controlling the action of that type of rectilinear cut off gear, also described in the
Specification to my before named prior Letters Patent.
This arrangement of working is especially applicable to Cornish valves and others,
commonly known as "Corliss valve" engines, and Stamper valves, or any other
analagous kinds of valve gear requiring similar cut off motions.
Vibratory motion is imparted from the piston rod to the aforesaid tappet rods
by means of single or double bell cranks, bevil gearing, or other equivalent
devices.
And in order that my said Invention may be fully understood I shall now proceed
more particularly to describe the same, and for that purpose shall refer to the
several Figures on the annexed Sheets of Drawings, the saine letters of referenco
indicating corresponding parts in all the Figures.
Figures 1 and 2 of the accompanying Drawings shew respectively a side
elevation of the main compound rocking lever and a sectional plan of the same.
Figures 3 and 4 are enlarged elevations of the exhaust and steam cams for
shewing their general configuration.
Figure 5 is a detail sectional view to an enlarged scale of the detent disc, bell
crank, or quadrant, which intermittently imparts its motion to the valve rods.
Figure 6 (Sheet 2) represents a plan (according to one arrangement) of one set
of "cut off and detaching gear"; and Figure 7 is an end view of the same.
Figures 8, 9, 10, and 11 illustrate elevations and part sections of the detent discs
bell crank, or quadrants provided with suitable recesses for receiving the detent
boxes.
Figures 12 and 13 is a plan and part end sectional elevation respectively of a
modified arrangement of "cut off" and detaching gear, while Figures 14 and 15 is
a side and transverse section respectively of the detent holder or box as arranged
for such modifications.
Figures 16 and 17 (Sheet 3) shew a front and side elevation respectively of an
arrangement of rectilinear valve gear, as applicable to working Stamper, Cornish,
or Corliss valves, in which views one valve is represented as closed and the other
open; and Figures 18 and 19 represent a detail, plan, and end view of the gearing
connected with the governing apparatus.
Figure 20 (Sheet 4) represents a front view of a modified arrangement of
tappet rods and levers in rectilinear valve gear, while Figures 21, 22, and 23 shew
detail views of a modified arrangement of levers, wheels, and sectors for working
such rectilinear detaching gear.
And Figures 24 and 25 (Sheet 5) of the Drawings represents a side elevation
and plan respectively of the general arrangement of my valve gear as applied to
working piston valves in a horizontal engine, similar arrangements being also
applicable to a vertical engine.
A, A', are the main compound rocking levers, which may be in the form of
double ended bell cranks, quadrants, discs, or other convenient configuration,
arranged to rock axially or vibrate radially on the exhaust valve spindles B, B¹,
mounted in suitable bearings at each end of the cylinder.
In the Specification to my before mentioned former Letters Patent, granted to
me on the Twentieth November, One thousand eight hundred and seventy seven,
No. 4340, the aforesaid main compound rocking levers were arranged on the front
ends and horizontally opposite the said exhaust valves, but not arranged to rock
axially or vibrate thereon.
According to my present arrangement they are placed at the rear ends or outer
extremities of the said spindles, or in some similar convenient position, and suitably

page_text: arranged so as to rock or vibrate together with the small dedent rocking levers
C, C¹ C³, C³.
On the same spindles are carried the steam and exhaust cams D, D', D², D³, free
to move or vibrate to and fro independently of the main compound rocking
levers A, A¹, and one set of which are shewn detached to an enlarged scale at
Figures 1 and 2 of the Drawings.
Each main compound rocking lever A or A¹ forming actually a "double armed "
or "double ended double sided lever," is constructed or formed of two single armed
levers a, a, (or a², a³) as represented at Figures 1 and 2 of the Drawings, which
may be jointed either at their sides, ends, or other suitable position, and bolted or
secured together at their extremities a, a, (or a, a,) so as to form one compound
lever having limbs, arms, or single lever capable of receiving independent
vibratory motion, and thus forming the "segmental levers" previously mentioned.
The two single levers forming the compound levers in each set of gear, one for
working the steam valve rod A³, and another for operating that of the exhaust
valve As are provided with suitable shaped bosses, the one concentrically formed
for the steam lever, and the other cylindrically formed for the exhaust lever a³
and a, so that they are each caused to grasp or encircle each other upon the exhaust
valve spindle B, as shewn in the section at Figure 2. According to this arrange-
ment they are allowed to work independently one within the other, the single
exhaust cylindrically formed lever boss a being placed inside and fast to the said
spindle, and the single steam concentrically formed lever boss as outside of the
former, so as to be free to vibrate or rock independently of each other.
E is one of the detent disc levers or quadrants mounted so as to work on the
spindle in the recesses formed by the arms of the said single levers, which grasp
the bosses of the said levers sufficiently tight upon the valve spindle to cause a
degree of interlocking, and yet leave all the parts (that is, the disc and two sets of
levers) capable of moving independently of each other.
The detent discs, bell cranks, or quadrants having been slipped on over the bosses
into the recesses formed between the arms of the single levers, the other sides of
the levers are bolted on, as shewn, so as to make compact interlocked pieces of
mechanism forming partially hollow or recessed "double" sided "double" ended
compound levers A, A', containing or partly enveloping the detent discs or bell
cranks E, E. By such compact arrangement of parts a sufficient working grasp,
and yet freedom, is obtained, so as to prevent undue or irregular deterioration or
lateral wear of the detent mechanism.
A detached elevation of one compound rocking lever is shewn at Figure 1 of the
Drawings, and the outer ends of the arms of which will be seen to be provided
with semicircular or curved lever end casings b, b', which extend in plan right
across the entire breadth thereof. On the inner sides of such casings are provided
steel hardened or other suitable metallic detent pieces 62, 63, having small bites,
notches, or recesses at 6, 65, into which detents, hereinafter described, are caused to
intermittently engage.
The small detent.rocking levers-C,-C,-C2, C3, are; according to the arrangement
shewn at Figures 6 and 7 of the Drawings, fixed on suitable spindles c, c¹, (c², c³₁)
carried by the detent discs or bell crank levers E, E¹, at a suitable radial position
the right and left of the centre of the exhaust valve spindles B, B¹, see also
Figures 24 and 25.
These aforesaid detent rocking levers are devised to intermittently operate the
detents for controlling the steam and exhaust valves in the manner hereinafter
explained. For this purpose the detents d and their actuating mechanism are
arranged within separate boxes or holders which fit into suitable recesses formed
in the detent disc or bell cranks E, E, as shewn in detail at Figures 8 to 11 of the
Drawings inclusive. These separate detent boxes or holders may extend only
partially or quite through the discs or bell cranks, as desired or found convenient,
and as represented in the sectional details at Figures 10 and 12 of the Drawings,
in which position they are suitably secured by bolts in any ordinary manner.

page_text: The detent rocking levers have small friction rollers f', ƒ³, (ƒ³, f) mounted at their
upper extremities which engage with the cam surfaces before referred to, and are
carried by small spindles c, c', c², c, having projections G formed upon them which
fit into parallel recesses or slotted grooves formed in the detent pieces d. Thus
as the levers and their spindles are caused to rock or vibrate by the projections on
the peripheries of the cams engaging with the said rollers f¹, ƒ, (ƒ³, ƒ) the
detent pieces d' are caused to project or recede at about right angles to the
periphery of the disc or bell crank, and so cause them to either engage or become
disengaged from the bites, notches, or recesses b* or 65 formed on the inner sides
of the said semicircular or curved lever end casings arranged on the compound
rocking levers. One of the small detent rocking levers C or C in each set of
gear is provided to engage and release the detent d of the steam valve, and the
other one C or C³ to similarly operate the detent of the exhaust valve.
These levers being carried in a suitable position on the faces of the discs, bell
cranks, or quadrants E, E¹, they are free to move or vibrate to the position
required to fulfil the above operations.
The detent discs, bell cranks, or quadrants are connected at H, H', by a coupling
rod or cross bar I to the main eccentric rod J, by which a constant, uniform, radial,
reciprocating, or vibratory motion is imparted to both the discs E, E¹, about their
spindles B, B¹. The small detent rocking levers being suitably carried on either
faces, as above described, are also obviously caused to receive or partake of the
same vibratory motion, which are further caused by the detents to transmit the
same to either arms of the compound levers before described, so as to alternately
It should be
actuate at the proper intervals either the steam or exhaust valves.
understood that the normal condition or position of the said detent rocking levers
is with the rollers f¹, ƒ³, (ƒ³, f) of their upper extremities reclining by their own
weight on the peripheries of the cams in their lowest position, and consequently the.
projections G on their spindles so moved as to force the detent pieces d' out and
keep them in gear with the bites, notches, or recesses 6 or 65 provided on the arms.
of the compound levers, as before explained, whereby the constant reciprocating
motion imparted to the discs E, E', from the eccentric is further intermittently
communicated to the valves by the rods A2, A3, A4, and A³.
In this manner these rods actuating the piston valves are maintained in gear
and raised for a definite time, and travel when they are subsequently released by
the projections on the peripheries of the cams raising the detent rocking levers,
so as to cause the detents to be withdrawn from the arms of the compound levers
in the manner hereinafter more fully described. When the arms and rods are thus
released they descend by their own weight so as to close the valves, their fall
being retarded or broken by pistons working in dash pots N', N', N³, and N* in
the usual and well known manner.
It will be understood that by the suitable motion imparted by the eccentric
(or other similar source of motion) the crank is led over its centres, and the
consequent "leading or linear" motion thereof is transmitted to the detent discs
or bell cranks, and their connections are of such a character as to enable the said.
detent rocking levers to receive early motion whereby the before mentioned cams
are brought early into action, so as to enable the steam valve to be promptly
released from the detents, so as to effect an early "cut off."
In order to carry and accommodate the compound rocking levers, detent discs,
steam and exhaust cams, the exhaust spindles are lengthened or prolonged, so as to
carry the whole of the working gear in a very compact manner, as represented in
the accompanying Drawings.
[
Another part of my present Invention relates to an improved arrangement of
the radial detaching gear and cut off apparatus" described in the Specification
to my former Letters Patent hereinbefore referred to, whereby the regulation and
control of the aforesaid detents is more simply and effectually obtained. I now
alter the position of the two said exhaust cams D1, D³, as formerly used, and mount
one of them on each of the exhaust valve spindles B, B¹, in front of the said detent

page_text: discs or bell cranks E, E¹, and compound rocking levers A, A', and also provide
two other steam cams D, D2, of similar forin to those above mentioned and arrange
them side by side each other in front of the aforesaid exhaust cams on the exhaust
valve spindles, as illustrated in the accompanying Drawings. The exact position
of either of the cams can be suitably varied to suit any particular requirements.
Thus each separate exhaust valve spindle B or B¹ carries one steam cam D or D³
and one exhaust cam D' or D³, each of the said cams being capable of receiving
separate and distinct motion in the manner hereinafter described.
The two steam cams D, D*, have projections on their peripheries of such suitable
form and size as to lift up or cause the small detent rocking levers C, C³, to
vibrate or move at the proper intervals as the rollers on the said levers follow the
cam surfaces, whereby the detents d' are withdrawn from the bites, notches, or
recesses 6*, provided on one of the arms of the compound levers connected with
the steam valves.
But in the case of a vertical engine the aforesaid steam and exhaust cams
are arranged in pairs on the bottom steam and exhaust valve spindles, i.e.,
two steam cams are placed side by side on the said bottom steam valve spindles,
and similarly two exhaust cams, side by side, on the bottom exhaust valve
spindles.
In all other respects the construction, arrangement, and operation of the
detaching apparatus or gear is exactly similar to that described with reference to
the horizontal engine. The coupling rods connected to the cams also remain the
same, and are attached by suitable single or bell crank levers to the main rocking
beam or lever, as before described.
The rocking levers C₁, C³, for releasing or engaging the exhaust valve detents
have also a similar notion imparted to them as those of the steam cams, but are
not arranged under the control of the governing mechanism hereinafter described.
The two steam cams D, D2, are operated on and receive their vibratory or radial
reciprocating motion from a rocking lever or beam K and shaft k, placed vertically
(according to the arrangement shewn) and at such suitable horizontal centre of
the aforesaid lever or beam that the vibratory motion of the same is (according
to this arrangement) equally divided between the valve spindles; but the rocking
lever or beam might be if desired arranged to work in any other convenient
position.
On the top end of this rocking lever or beam is provided a pin ¹, carrying a
small disc or 44
double ended bell crank" L, capable of moving freely with the
vibratory motion of the said lever or beam K. On the disc L are provided three
pins, two, 1, 1, on the same centre line, and the third at right angles, thus
forming, as commonly called, a "double ended bell crank lever," which for
convenience and balance may be made as a disc, and to these pins are connected
coupling rods M, M₁, which are also extended to the right and left, and connected
to the steam cams D, D2, at the points d and d², the coupling rods being free to
move in a horizontal direction to suit the vibratory or oscillating action of the cams
and disc L on the rocking lever or beam, as will be readily understood by reference
to Figures 1 and 2 of the Drawings.
The bottom end of the vertical rocking lever or beam K is connected to a
coupling rod O leading and connected to the main detaching rocking lever 0¹
attached to the piston rod at P, or other parts producing similar reciprocating
motion.
It is obvious that if desired some other equivalent devise might be used in lieu
of the said rocking lever or beam. For example, the disc L might be carried by a
sliding block working in suitable guides and receiving similar reciprocating motion
from the piston rod of the engine.
Thus as the piston performs its forward and backward strokes a constant
vibratory motion is imparted from the main detaching rocking lever O¹ to the
vertical rocking lever or beam K, which reciprocating motion is transmitted to the

page_text: disc or bell crank L, and thence to the steam cams D, D³, by the before mentioned
coupling rods M, M'.
On the third pin of the disc L is connected the gearing Q communicating with
the governing apparatus by a coupling rod q, whereby the said disc is held under
command of the motion of the governor, and which by depressing or raising the
disc so as to cause it to turn about the centre or fulcrum causes a corresponding
alteration in the position of the projections on the steam cams. The position of
the said cams are thus caused to alter or vary from time to time as the speed and
load of the engine may require, so as to produce an early or late cut off, as described,
thereby automatically and uniformly governing, controlling, or regulating the
steam valves and supply under all fluctuating circumstances.
It may here be noticed that by the peculiar arrangement of the inner detent
levers attached to the detent boxes or holders F, F¹, (F, F³,) before referred to (and
which are secured to the faces of the rocking discs E, E¹), the "linear advance" of
the eccentric is taken advantage of; also by the peculiar reverse oscillatory action,
rocking or vibratory motion of the said cams and the aforesaid detent disc, or bell
cranks, a "double meeting motion" takes place in such a manner as to hasten the
release of the small rocking detent levers, and thus similarly hasten the release of
the steam valve detents.
This aforesaid hastening of the release is effected by the small detent levers
which move forward with the detent discs or bell cranks in one direction
(separately from the said steam catns), while the said steam cams also similarly
move, rock, or radially vibrate, but have a motion in an opposite direction to the
said small detent levers, and thus the projections on the peripheries of the cams are
caused to meet the motion of the detent discs so as to promptly engage and
raise the detent levers, and thus liberate the before mentioned detents of the steam
valves.
22
This peculiar "meeting motion or reverse action of the detent discs E, E¹, and
the main compound rocking levers A, A', actuated by the eccentric to that of the
aforesaid cams operated by the travel of the piston, is illustrated by the direction
of the arrow shewn at Figure 24 of the Drawings.
The two exhaust cams D', D³, also receive their motion through the intervention
of coupling rods m, m', connected right and left to each separate cam, similar to
that of the steam cams already described, and in such suitable manner and place
that the rods are free to travel horizontally in either direction with the motion
of the rocking levers or beam K, as indicated by the direction of the arrows in
Figure 24.
These rods are coupled to a continuation or prolongation of the pin k', which
also carries the disc L before referred to, and which project in such a manner
that the coupling rod eyes are mounted and secured thereon, so as to be able to
move freely horizontally and impart motion to both the aforesaid exhaust cams.
The desired and necessary cushioning of the exhaust valve is effected by simply
lengthening or shortening the before said coupling rods by means of screw
couplings or adjusting boxes s, which may be so moved as to alter the position of
the projections on the peripheries of the said cams which accomplish the release of
the small detent rocking levers, whereby the exhaust valves are closed.
According to the modified arrangement of detent apparatus shewn at Figures 12
to 15 (Sheet 2) inclusive of the Drawings, the detent holders or boxes F, F, with
their mechanism hereinbefore described are arranged on the arms of the compound
rocking levers A (A'), in lieu of on the faces of the discs or bell cranks E (E'), as
in the first described arrangement.
In carrying out this modification of my said Invention the relation of the detent
apparatus is entirely reversed, that is, the detent holders F, F', and small rocking
levers C, C', (C2, C3,) are carried by the arms of the aforesaid compound levers A (A'),
while the bills, notches, or recesses b, b, in which the detents engage are provided on
the vibratory discs or bell cranks E (E'), as shewn in the Figures above
referred to.

page_text: It will be readily understood that intermittent motion is imparted to the valves
and the "tripping out action" of the detents by the cams, affected in an exactly
similar manner to the operations described with reference to the first arrangement,
the object obtained by the present modification being that the detents are caused
to hold or retain each other longer in gear, and yet not delay the early "cut offs."
In fact the latter is accelerated by the increased radial motion or travel of the
detent bar, which is fixed according to this arrangement at a greater distance from
the axis of the valve spindles.
All similar letters on these Figures of the Drawings relate to similar parts shewn
and described in the first named arrangement.
In order to more effectually govern or control the action of the rectilinear cut off
gear also described in the Specification to my former Letters Patent herein before
referred to, I now provide an arrangement of suitably formed tappet rod or rods
R, R¹, provided with angular parallel projections 7, r¹, as represented in Figures 16
and 17 (Sheet 3) of the Drawings.
These rods may be of any acquired number, having angular parallel projections
,, of suitable depths formed thereon, and so combined in a parallel manner or
relation and of such a desired length as to be suitable to the stroke of either the
"cut off motion" or governing apparatus. The angular parallel projections perform
similar functions to the projections of the before described steam cams. The said
angular formations on the tappet rods R, R', are applicable to the working of
Cornish valve gear or other similar type commonly called "Corliss" valve engines,
"Stamper valves," or any other similar kind of valve gear in which the "cut off
motions are analagous to those herein before described. And it may be further
understood that the above mentioned rectilinear valve gear is also applicable to the
working of ordinary slide valve gear in which the steam ports have separate slide
valves, as will hereinafter be referred to. For each separate cutt off motion only
one angular parallel projection or tappet rod is employed, and one angular parallel
projection or tappet rod for each separate exhaust valve cut off gear for either
engaging or disengaging the small detent rocking levers herein before described.
"
In the present arrangement the angular parallel projection or tappet rods are
placed in a vertical position relatively to and according to that of the cut off gear,
and is at all times parallel with the centre lines of the same whether the latter
is placed vertically or horizontally (according to requirements and position), and
the said tappet rods terminate or have requisite eyes or slotted cross heads S, S¹, or
other suitable connections, and work in suitably formed guides s¹, s³, 83, 84, 85, and 8,
or other appliances, and provided with the usual adjusting boxes & for lengthening
or shortening the angular projections or tappets,, by which the rate of "cut
off" can be varied or adjusted as required; in this manner the expansive working
of the engine may be most rapidly and delicately adjusted according to the require-
ments of the load or condition of the same. On the before mentioned angular
parallel projections », r, of the tappet rods R, R', the small rocking detent levers
_C, C, are made to work. On_the_outer_ends_or_opposite to that of the rocking
shaft of the levers are mounted rollers f, f³, similar to those previously described
with reference to the radial detaching gear, or in lieu thereof a pointed end may
be provided of such form as to follow the angular parallel projections. The action
of the gear is such that when the small rocking detent levers C, C¹, travel upwards
or forwards according to the rectilinear motion imparted to them they are caused
to engage for a certain definite interval or travel (according to the action of the
governors) with the said angular parallel projections which travel in a contrary or
opposite direction at all times to that of the rocking detent levers, as indicated by
the direction of the inverted vertical arrows, thereby producing a "double "meeting
motion" for disengaging or releasing the detents of either the steam or the exhaust
valves.
The mechanism and operation by which the detents are intermittently dis-
engaged from the valve rods and rectangular frames or slotted boxes a, a', is
exactly similar to that described in the Specification to my former Letters Patent,

page_text: herein before alluded to, and shewn at Figures 6 and 7 (Sheet II.) of the Drawings
thereunto annexed. But in this portion of the aforesaid Specification to my
former Letters Patent this type of detent gear is shewn and described as working
piston valves, but it will be readily understood that by dividing the present
arrangement of tappet rods they would be equally applicable to the working of the
same class of valves.
That is, instead of placing the two tappet rods R, R', with their parallel
projections 7, 1, (having angular faces) together side by side as shown in the
Drawings, they might be so separated to work independently of each other at
opposite ends of the cylinder for operating piston valves, as described in my first
arrangement.
The constant vertical reciprocation of the tappet rods R, R', is communicated to
them by the piston rod through the intervention of the rod O and rocking lever
or beam K in a similar manner to that described with reference to the first
arrangement.
The rods a², a³, carrying the detent box and rocking levers C, C¹, at their upper
extremeties are also caused to receive a uniform rectilinear reciprocating motion
from the main eccentric mounted on the prime shaft of the engine or other
equivalent source of motion hereafter mentioned.
That is, other direct or indirect motion might be employed, such as could be
readily derived through the intervention of cams fixed on a rotating secondary
shaft, and commonly termed "a cam shaft," or a main eccentric weigh and rocking
shaft might be employed on which suitable rocking levers are usually fixed, and
to which the before described valve rods could be connected or coupled up so as to
all receive suitable motion from the prime or crank shaft of the engine.
Or further, in the case of separate slide valve gear (as hereinbefore mentioned),
the rods a, as, might be connected to the single or two exhaust valves, and the
slotted frame to the slide valve spindles, either separately or combined in one
aforesaid frame, according to requirements; in all other respects the arrangements
and operation of the gear is the same as before described.
And thus at the proper intervals the moving projections 7, r², on the tappet
rods R, R¹, operate the detent levers C, C¹, so as to disengage or release detent
pieces from the slotted framings a, a', whereby the motion of the rods a³, a³, is
disconnected from the said frames which are arranged to work in the dash pots
at e, cl, and operating the valve rods A2, A3, carried by their upper extremities.
The detent levers subsequently return into gear with the slotted box or frame at
proper intervals by virtue of their own weight.
Qis a double lever having one arm suitably connected to the rocking lever K.
and the other formed as a toothed sector or quadrant q engaging with suitable level
gearing T, having an auxiliary arm U suitably arranged in connection with the
governing mechanism, as shewn at Figures 16, 18, and 19 of the Drawings.
According to another modification the tappet rod or rods R, R¹, is or are arranged
of uniform section, see Figure 20, Sheet IIII. (the angular form of the projections
being dispensed with), and in lieu thereof a square detent or catch of suitable
depth and width r, r, is provided so as to form a bite or catch thereon. In this
bite or catch the before mentioned small rocking detent lever or levers C, C', is or
are caused to engage, and which is or are placed always at right angles to the
tappet end rods. The outer end of the latter is made of such form as to engage
in the said detent catch or bite, as represented in the Drawings, the working.
motion of the said small rocking detent levers, and that of the tappet rods
remaining the same as before described, the parallel surface of the said tappets
also remaining the same.
It will be now understood that the said detent tappet rods move or reciprocate.
in straight lines or in rectilinear paths, while the detent levers are caused to
work or vibrate radially, whereby the said rods in their travels are caused to.
intermittently engage and release the said detent levers.
The before named angular parallel tappet rods have a motion given them from a

page_text: separate straight lever, or double ended bell crank, or other equivalent and suitable
arrangement of levers.
"
The present "rectilinear cut-off motion " or detaching gear" is arranged to be
fixed or placed on Cornish valved" engines or "Stamper valved" engines, or
generally where the steam valve cut off motion or gear is placed in pairs vertically
side by side and parallel with each other at suitable distances apart.
The before described angular parallel projecting tappet rods are made of suitable
lengths, and at the bottom ends of which are placed the usual eyes, or slotted
cross head and adjusting box, which may be actuated by the first described arrange-
ment of levers, or according to the method shewn at Figures 21, 22, and 23,
Sheet 4. The eyes or slotted and adjusted boxes S, S¹, are separately attached and
jointed workably to the separate ends of double ended solid bell cranks k¹, k², or a
straight double ended rocking lever carrying toothed sections 3, k, at their one ends.
These levers are centrally placed on a governor rocking pin or weigh shaft t also
carrying the bevil or mitre wheel K. or other equivalent rocking lever, which may
be modified according to position and circumstances required by the governor and
detaching gear. The single ended rocking lever or bell crank lever fixed to the
spindlet (not shewn in the Drawings) is suitably attached by either a weigh shaft
or connecting rods to the engine governing apparatus, and by which the governors
control the entire action of the tappets r, r, which release the detents of the steam
valves according to the speed and load of the engine, and by which the engine is
automatically controlled and regulated.
On the aforesaid central pin or shaft t the before named double end rocking bell.
cranks or double ended straight rocking levers k¹, ², are made to move freely, and
equally divide the vibration in a horizontal direction, independently of the before
named single end governor lever or arm p, which is fast thereon, and of any other.
action of the governor.
To a low suitably fixed point on the periphery of the toothed wheel K or rocking
levers attached the connecting or coupling rod O from the main detaching rocking
lever, and which imparts motion to the said double ended centre bell cranks or
straight levers le, k2, above referred to, so as to move or work the before named
angular parallel projecting tappet rods R, R', in the desired vertical direction
upwards and downwards alternately, separately and independently of that of the
governors, according to the position of the said rectilinear "cut off motion." In
this manner "a double meeting motion" is produced and transmitted for dis-
engaging the detent of the said steam "cut off gear" in a similar manner to that
already fully herein described with reference to the radial detaching apparatus
or gear."
<<
:
"
According to another arrangement provided, and which is applicable to the use
of the "rectilinear cut off; detaching, and regulating gear," when applied for the
use of commonly called Corless valves," or other valves which contain separate
steam and exhaust valves, providing the rocking valve spindles of which are placed
-at-right-angles-with-the-main-centre-line of the engine, that is, providing that the
rectilinear cut off" detent motion is placed at all times so as to work vertically
in a similar manner to that shewn, and described with reference to the horizontal
engine, in this case the two steam cams and two exhaust cams (situated on the
exhaust valve spindles) are dispensed with, and before. described tappet rods
with angular parallel projections are provided in their stead, and give motion to
the same.
Two separate single bell crank. rocking levers are provided for the use of the
steam tappet rods, and two similar separate single bell crank rocking levers are
provided for the use of the exhaust tappet rods should the cut off gear be used for
the exhaust valves. The rocking levers are placed. separately at right angles to
each separate tappet, rod, and are connected-to the bottom ends thereof by suitable
pins and .eyes.
Motion is imparted to each of, the rocking levers or bell cranks to which the
tappet rods are attached, and to which are joined the detaching gear coupling

page_text: rods, and in all other respects attached to and worked by the hereinbefore described
rocking lever or beam employed in connection with the radial detaching cut off
and regulating gear."
All of which above mentioned gear (or parts thereto belonging) are applicable
for use, and work on the said "rectilinear cut off detaching gear," with the
exception of the before mentioned omitted two steam and two exhaust cams.
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is,-
First. In valve gear having a detent action operating in a radial direction, as
set forth in the Specification to my former Letters Patent, dated 20th November
1877, No. 4340, the use of compound rocking levers formed with two double
sided arms capable of independent motion, having, bosses grasping each other upon
the exhaust valve spindles, and with the detent rocking discs, bell cranks, or
quadrants so arranged as to encircle, and interlock, and work compactly within the
said double sides of the levers, substantially as and for the purposes hereinbefore
described and illustrated in Figures 1 and 2 of the accompanying Drawings.
Second. In valve gear having a detent action, as referred to in the preceding
claim, arranging or carrying the small detent rocking levers with their double
detent mechanism on or in the detent rocking discs, bell cranks, or quadrants,
receiving their vibratory motion from the eccentric, and arranged to engage with
suitable bites, notches, or recesses provided on the arms of the compound levers,
substantially as and for the purposes herein before described and illustrated in
Figures 6 to 11 inclusive of the accompanying Drawings.
Third. In valve gear of the above description having double detent rocking
levers and apparatus carried by the discs, bell cranks, or quadrants, or by the arms
of the compound levers, the construction and arrangement of the separate detent
boxes or holders for containing, carrying, and fixing the same, substantially as
herein before described and illustrated in Figures to 11 of the accompanying
Drawings.
:
Fourth. In valve gear of the above description having compound levers and
detent apparatus constructed and arranged as set forth in the preceding claims, the
combination therewith of steam and exhaust cams mounted on the same separate
spindles capable of vibratory or radial reciprocating action or motion, and arranged
so as to operate on either horizontal or vertical engines, substantially as and for
the purposes hereinbefore described and illustrated in the accompanying Drawings.
Fifth. In valve gear of the above description, the construction and arrangement
of radial detaching apparatus having a vibratory or radial reciprocating motion
imparted to the same from the piston rod or other source of motion coincident.
therewith, operating the aforesaid steain and exhaust cains through the intervention
of a rocking beam, or lever, or equivalent device, so as to release the detent
apparatus controlling the valves, and the whole being regulated or controlled by
governing apparatus in connection therewith, substantially as and for the purposes
hereinbefore desbribed and illustrated in Figures 24 and 25 of the accompanying
Drawings.
Sixth. The general construction and compact arrangement of the valve gear
having a radial detent action, and the several parts so combined as to operate
substantially as hereinbefore described with reference to Figures 1 to 15, and 24
and 25 inclusive of the accompanying Drawings..
Seventh. In valve gear operating with a rectilinear detent action, as herein
set forth, and also referred to in the said Specification to my former Letters
Patent, the use of separate tappet rods having angular fixed parallel projections
arranged to work separately or in pairs in a vertical or horizontal-plane, by motion
communicated to them from the piston rod or other coincident source of motionby
suitable intermediate gearing, the whole being so constructed and-arranged so as

page_text: to operate substantially as and for the purposes hereinbefore described and
illustrated in Figures 16 to 19 of the accompanying Drawings.
"Eighth. In valve gear having a rectilinear detent action, as referred to in the
preceding claim, the modified construction and arrangement of the tappet rods and
detent levers, operating substantially as and for the purposes. hereinbefore described
and illustrated in Figure 20 of the accompanying Drawings.
Ninth. In valve gear of the last mentioned type, the arrangement of levers,
sectors, and toothed wheels, or their equivalents, for working the detaching gear,
operating substantially as herein before described and illustrated at Figures 21, 22,
and 23, of the accompanying Drawings.
Tenth. The general censtruction and arrangement of the rectilinear valve gear
having the cut off and detaching gear so combined as to operate substantially as
and for the purposes hereinbefore described and illustrated in Figures 16 to 23 of
the accompanying Drawings.
In witness whereof, I, the said George Lewis Lambert, have to this my
Specification set my hand and seal, this Eighteenth day of January, One
thousand eight hundred and eighty two.
GEORGE LEWIS LAMBERT. (L.S.)