Improvements in Valve Gear.
Year: 1892

page_text: Date of Application, 29th June, 1892
Complete Specification Left, 2nd Feb:, 1893-Accepted, 13th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Valve Gear.
We, WALTER JONES LLEWELLYN and JOSEPH BATE, both of the Wellington
Iron Works, Redditch, in the County of Worcester, Engineers, do hereby declare
the nature of this invention to be as follows:-
This invention relates to the manner in which we construct and arrange valve
gear for use upon steam engines and other engines having the motion of a piston
controlled by the operation of a slide valve or valves and ports. The objects of
our invention being to provide an automatic cut off at any part of the piston stroke..
instantaneous opening and closing of the ports for the prevention of wire drawing,
together with the simplification of the parts connected with the working of the
valve.
In carrying our invention into effect, when constructing our valve gear for
operating or moving an ordinary "D" slide valve or valves upon an ordinary steam.
engine: We carry the valve spindle through a gland in the ordinary manner, the
end of the spindle being supported or carried, preferably in a bracket or external
bearing.
Upon the portion of the spindle projecting beyond the steam chest gland, we
mount or attach a collar or sleeve or other projection capable of being attached to
or connected with a bell crank lever mounted in a suitable position; and when
more than one valve is employed we employ a lever in connection with eachspindle,
the levers being preferably under the bell crank lever, but working on the same
centre.
The bell crank lever we carry upon a pivot or shaft, and we cause one end to
engage with the valve spindle, and the other to be connected to an intermediate
rocking lever og levers, in such a manner that the rocking lever by its vibratory
movement causes the valve to travel backwards and forwards, opening and closing
the ports. The rocking lever we operate by means of a pair of discs or cams
carried on the crank shaft or other motion shaft of the engine. The discs we
provide with projections or with slots to receive strips or bars to serve as
projections from the faces of the discs. Between the discs we arrange a roller
carried upon the end of the rocking lever, or we cause the end of the rocking lever
to be suitably shaped to take either a roller or sliding collar, and to work between
the disc faces in such a manner that when the shaft revolves the projections upon
the discs cause the rocking lever to set in motion the slide valve or valves. The
projections on each disc being arranged to provide for the steam, and for the
exhaust, respectively.
The position and shape of the projections we alter to suit any particular
requirement, and we automatically control the movement of the slide valve to suit
the work upon the engine by means of an ordinary governor, which we couple up
to or connect to the vibrating or rocking lever in a manner to cause the travel of
the roller along the end of the lever so as to be in a position nearer to, or farther
from, the centre of the shaft, and thus sooner or later in its action upon the valve.
We connect the end of the roller spindle, and also the sliding collar whichever is.
used upon the rocking lever, with a lever or link having by means of an ordinary
coupling or universal joint, a positive attachment to the rising and falling arm of
the governor main lever; so that as the governor rises and falls the roller is
worked in or out along the space between the two cam discs for the purpose of
varying the position of contact of the roller, and the projecting bars or cams.
We prefer to form the discs in such a manner that a clear space exists outside
and inside the ends of the projections within which the roller can remain, without.

page_text: the valve being moved, so that any accident resulting to the engine would ensure a
movement of the valve roller to a position preventing further admission of steam to
the cylinder.
Instead of employing a supplementary rocking lever to operate a bell crank lever
connected with the valve spindle, we sometimes cause the bell crank lever to be
prolonged to carry the roller or collar on its. end. We conveniently effect this in
one manner, by mounting a small spindle or roller shaft in bearings fixed upon the
bell crank lever, and we couple up the end of the shaft to the governor arm lever,
or to any ordinary cranked lever worked from the rising and falling sleeve of the
governor.
We modify the form of linkage and levers to suit any peculiar type of valve or
valves having rocking or rising and falling, instead of sliding movements, and we
employ any ordinary form of governor for actuating the movement of the roller
along the space between the two cam.discs.
tu.
We employ the same essential features hereinbefore described when applying
our improved valve gear to suit engines worked by compressed air or by other
fluid.
Dated this 50th day of Lu. 1900
+3
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Valve Gear.
We, WALTER JONES LLEWELLYN and JOSEPH BATE, both of the Wellington
Iron Works, Redditch, in the County of Worcester, Engineers, do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
This invention relates to the manner in which we construct and arrange. valve
gear for use upon steam engines and other engines having the motion of a piston
controlled by the operation of a slide valve or valves and ports. The objects of
our invention. being to provide an automatic cut off at any part of the piston stroke,.
instantaneous opening and closing of the ports for the prevention of wire drawing,
together with the simplification of the parts connected with the working of the
valve.
In carrying our invention into effect when constructing our valve gear for
operating or moving an ordinary D slide valve or valves upon an ordinary steam
engine, we arrange the same in one convenient form as illustrated in the accom-
panying sheet of explanatory drawings.
Figure 1 is a side elevation of an ordinary horizontal type of engine having our
improved valve gear arranged thereupon, and Figure 2 is a plan of the same.
Figure 3 is a sectional elevation of our improved cam and lever with the governor
connections shown in detail,, and Figure 4 is a sectional end elevation of the
governor bracket and driving gear.
Figure 5 is a sectional elevation of an alternative method of governing the cam
roller and Figure. 6. is a detail plan of the cams and roller.
We carry the valve spindle A through a gland in the ordinary manner, the end
of the spindle being supported or carried preferably in a bracket or external
bearing B. Upon the portion of the spindle a projecting beyond the steam chest
gland C we mount or attach a collar or sleeve or other projection D capable of
being attached to or connected with a bell crank lever D₁ mounted in a suitable
position; and when more than one valve is employed we employ a lever in con-
nection. with each spindle, the levers being preferably under the bell crank lever but
working on the same centre. The bell crank lever we carry upon a pivot or
shaft E, and we cause one end.d to engage, with the valve spindle and the other d¹
to be connected to an intermediate rocking lever or levers Fin such a manner that
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page_text: the rocking lever F by its vibratory movement causes the valve to travel back--
wards and forward opening and closing the cylinder ports. The rocking lever F
we operate by means of a pair of discs or cams G, G carried on the crank shaft K
or other motion shaft of the engine. The discs G G¹ we provide with projections H H
or with slots to receive strips or bars to serve as projections from the faces.
of the discs. Between the discs we arrange a roller L carried upon the end of*
the rocking lever, or we cause the end of the rocking lever to be suitably shaped
to take either a roller or sliding collar and to work between the disc faces in such a.
manner that when the shaft Krevolves the projections H H upon the discs G G₁
cause the rocking lever F to set in motion the slide valve or valves. The projec-
tions on each dise being arranged to provide for the steam and for the exhaust..
respectively.
or later
The position and shape of the projections H H we alter to suit any particular-
requirement, and we automatically control the movement of the slide valve to suit.
the work upon the engine by means of an ordinary governor M which we may
couple up to or connect to the vibrating or rocking lever Fin a manner to cause-
the travel of the roller L along the end of the lever so as to be in a position.
nearer to or farther from the centre of the shaft K, and thus to be sooner
in its action upon the valve. We connect the end of the roller spindle and also
the sliding collar L whichever is used upon the rocking lever, with a lever or
link N having by means of an ordinary coupling or universal joint, a positive
attachment to the rising and falling arm O of the governor main lever P: so that
as the governor M rises and falls the roller L is worked in or out along the space-
between the two cam discs G G¹ for the purpose of varying the position of contact.
of the roller L and the projecting bars H H on the cains.
We prefer to form the discs G G in such a manner that a clear space R R
exists outside and inside the ends of the projections within which the roller can
remain without the valve being moved, so that any accident resulting to the engine.
would ensure a movement of the valve roller to a position preventing further
admission of steam to the cylinder.
Instead of employing a supplementary rocking lever to operate a bell crank
lever connected with a valve spindle we sometimes cause the bell crank lever to be-
prolonged to carry the roller or collar on its end. We conveniently effect this in
one manner by mounting a sinall spindle or roller shaft in bearings fixed upon the
bell crank lever and we couple up the end of the spindle to the governor arm lever
or to any ordinary cranked lever worked from the rising and falling sleeve of the.
governor. We sometimes operate our sliding roller L as shown in Figures 5 and 6..
Upon the spindle E we arrange the rising and falling collar P worked in the
ordinary way by the governor, and to this collar or sleeve P¹ we connect a lever
plate S which has an inclined slot or groove S' therein in which a pin or stud T
works. This stud T we connect to a slide bar U attached to the sliding roller L'
so that when the inclined lever plate S is raised or lowered by the governor
collar P the slide bar U is drawn backwards and forwards along the spindle f
carrying with it the roller L' to alter the cut off of the steam to the ports of the
cylinder as herein before described.
We modify the form of linkage and levers to suit any particular type of valve
or valves having rocking or rising and falling instead of sliding movements, and we
employ any ordinary form of governor for actuating the movement of the roller
along the space between the two cam discs.
We employ the same essential features hereinbefore described when applying our
improved valve gear to suit engines worked by compressed air or by other fluid.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what.
we claim is.
1. The combination and arrangement of a valve gear for engines having
revolving cams or discs to operate by means of intermediate levers, the slide valve

page_text: of an engine substantially as herein before described and as illustrated in the
accompanying drawings.
2. The construction of an automatic cut off slide valve gear having a sliding
roller or sleeve which is free to be drawn in and out between two discs or cams by
the rising and falling of the governor substantially as hereinbefore described and as
illustrated in the accompanying drawings.
3. In a valve gear for use upon engines in which a slide valve is employed for
controlling the admission and exhaust of the steam, the arrangement of a can or
disc, or pairs of cams or discs for setting in motion a rocking lever or arm for
actuating the movement of the valve spindle substantially as hereinbefore
described.
Dated this 1st day of February 1893.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicants.