Year: 1893

page_text: Date of Application, 13th Mar., 1893
Complete Specification Left, 11th Dec., 1893-Accepted, 20th Jan., 1894
Figs. 4, and are corresponding
valve gear according to my invention.
Figs. 7, 7, 8, 9 and 10 illustrate modifications hereinafter referred to.
Fig. 11 shows in perspective another mode of arranging the parallelogram valve
gear, whilst
Figs. 12, 13 and 14 illustrate in a diagrammatic manner modifications of this
construction.
Referring to Figs. 1 2 and 3 in Klug's radius rod valve gear the point a (Fig. 3)
of the eccentric rod E moves along a closed curve (eccentric-circle e); the pivot
or point 6 of this rod oscillates in the arc 3 which is that of a circle described
about the centre o by the radius rod 1. The valve rod G is pivoted at the point
and actuates the slide or other valve. The centre c which forms the pivot of the
radius rod is adjustable, and it is evident that an alteration in the position of the
centre c along the circular arc y described by the radius rod from the point b
(as a centre) of the eccentric rod, serves to alter the path of the pivot in the
well known manner, and consequently also the distribution of the steam.
alteration in position of the point c is effected by means of the lever B (Figs. 1 and 2)
mounted on the shaft r of the reversing lever.
This
This arrangement necessitates the interruption of the reversing shaft in the
plane of the eccentric rod E, the consequence of which is that the force exerted
through the radius rod 1, acts as a twisting force on the end of r with a moment h,
as can be seen from Fig. 2.
Now in order that the reversing shaft may be continued, without interruption,
through the plane of the eccentric rod, and be supported in bearings on both sides
of the latter to avoid this twisting action the eccentric rod E is shortened by the
removal of its rear part and has connected to it, according to this invention, at
the points a and a³, two equal and parallel radius rods and which may be of the
same length as the radius rod l. These rods are pivoted to a rocking bar S that is
pivoted at the point c, and are thus connected to the lever B of the reversing
shaft r.
The mechanism of the valve gear is not altered in other respects, the radius
rod and the rear part of the eccentric rod connected therewith being dispensed
with, without altering the law of motion of the eccentric rod, because the virtual
pivot b (Fig. 6) of the eccentric rod oscillates exactly as before in the circular
arc B.
The movement of the point c of the rocking bar S along the circular arc y for the

page_text: purpose of altering the distribution of the steam along the circular arc y is effected
by means of the lever B, which is made of the same length as the radius rods /
and 2, and at one end of which the rocking bar S is pivoted at c, whilst the other
end is pivoted to the continuous_reversing shaft r. For going forward the point G
will or may move in the path v Fig. 6 and when the direction of motion is reversed
it will move in the path z.
Figs. 7 7 8 and 9, illustrate several modifications of the described mode of
suspension of the eccentric rod.
In Figs. 7 and 74, as also in Fig. 8, the lever B (carried by the reversing shaft)
is situated between the two radius rods and 12; and the reversing shaft passes
through a clearance opening in the eccentric rod. In Fig. 7, the points of
connection a, a, a, b and c are situated in a straight line, whilst in Fig. 8 two valve
rods are connected to E at the points and and are actuated thereby. The
points of connection x, x¹ may be situated in any desired position.
In Fig. 9, the valve rod G is connected to a sleeve that can slide on the eccentric
rod, and in Fig. 10 it is connected to a point a of the eccentric rod outside of the
points of connection of the two radius rods and, whilst the eccentric a is
situated between these two points.
If the rigid connection a a² (Fig. 10) be broken, and the points a² and 6 to be
made stationary and if the levers B B¹ (see Figs. 11 and 12) are adapted to rotate
about them which levers are movably jointed by means of the rocking bar S, with
each other and with the radius rod 1, then the eccentric rod will be supported by
means of a radius rod ¹ from the rocking bar S, which is adapted to be shifted for
reversing or otherwise by means of one or other of the two levers B B¹.
In the arrangement shown in Figs. 11 and 12 the bar S has levers B, B¹ one at
each end and has the radius rod l' attached to the end of the eccentric rod E in a
manner the converse of that shown in Fig. 4, in which the eccentric rod, is
suspended by means of two radius rods from the rocking bar which is adapted to be
shifted by a single lever.
With this construction of the gear, since the levers B B¹ have the same length
as the radius rod, and the end point o¹ of the latter is also moved in a circular
arcy, the same object is achieved, as with the construction in Fig. 4 above referred
to that is to say the reversing shaft is not interrupted in the plane of the eccentric
rod, and all the forces act in the same plane.
One of the shafts from which the levers B and B are suspended, for instance",
may serve as the reversing shaft, and the other shaft as a bearing or support
only.
Figs. 13 and 14 show two modifications in which the levers B and B¹ are of
different lengths and are differently arranged, and the point c is caused to move
approximately in an arc of a circle. Furthermore in Fig. 13, the connection is
ou movable sleeve on the eccentric rod, similarly to Fig. 9.
☑
The movement of the point a of the eccentric rod may take place according to
any desired curve, the law of motion of which is derived in any manner from the
engine shaft.
As already before stated, the points of connection a a² a² and x of the eccentric
rod may have any relative position to one another. Also, the point of connection
of the valve rod may coincide with other radius rod points, and it is not absolutely
necessary that the radius rods and levers should form an exact parallelogram.
The valve gear herein described may be applied to steam engines and gas
engines, air motors or hydraulic motors, both for reversing and for variable expansion,
and for other purposes where such a valve gear is suitable.
Dated this 13th day of March 1893.

page_text: means of the lever B, which is made of the same length as the radius rods and 1,
and to one end of which the rocking bar S is jointed at c, whilst the other end is
fixed to the continuous reversing shaft r. For going forward, the point c (Fig. 6)
will move in the path e, and when the direction of motion is reversed it will move
in the path z.
Figs. 7, 7, 8 and 9, illustrate several modifications of the above described mode
of supporting the eccentric rod.
In Figs. 7 and 74, as also in Fig. 8, the lever B, carried by the reversing shaft,
is situated between the two radius rods l' and 1. In Fig. 7, the reversing shaft
passes through a clearance opening in the eccentric rod, and the points of con-
nection a, a, a, b and c are situated in a straight line, as they are also in Fig. 74.
In Fig. 8, two valve rods are connected to the eccentric rod E at the points and ¹
so as to be actuated from these points of connection, which may be situated in any
desired position.
In Fig. 9, the valve rod G is connected to a sleeve that can slide on the eccentric
rod, and in Fig. 10 it is connected to a point a of the eccentric rod outside of the
points of connection a¹, a' of the two radius rods and 12, the eccentric a being
situated between these two points.
If the rigid connection a, a² (Fig. 10) be broken, and the points a and b be made
stationary, and if two levers B, B¹ (shown in Figs. 11 and 12) be arranged to
partly turn about these points as centres, and are movably jointed by means of the
rocking bar S, with each other and with the radius rod й, then the eccentric rod
will be supported by means of a single radius rod from the rocking bar S, which
is adapted to be shifted for reversing or otherwise by means of one or other of the
two levers B, B' whereas in the arrangement shown in Fig. 4, the eccentric rod is
suspended by means of two radius rods from the rocking bar which is arranged to
be shifted by a single lever.
With the modified construction of the gear shown in Figs. 11 and 12, since the
levers B, B' have the same length as the radius rod ', and the point c¹ of the latter
is also moved in a circular arc y, the same object is achieved as with the con-
struction shown in Fig. 4, that is to say the reversing shaft is not interrupted in
the plane of the eccentric rod, and all the forces act in the same plane.
One of the shafts from which the levers B and B are suspended, for instance r,
may serve as the reversing shaft, and the other shaft as a bearing or support
only.
Figs. 13 and 14 show two modifications in which the levers B and B are of
different lengths and are differently arranged, and the point is caused to move
approximately in an arc of a circle. Furthermore in Fig. 13, the connection
on a movable sleeve on the eccentric rod, similarly to Fig. 9.
is
The movement of the point a of the eccentric rod may take place according
to any desired curve, the form of curve being derived in any manner from the
engine shaft.
As already stated, the points of connection a, a, a², and x of the eccentric
rod may have any relative position to one another. Also, the point of con-
nection of the valve rod may coincide with other radius rod points, and it is
not absolutely necessary that the radius rods and levers should form an exact
parallelogram.
The valve gear hereinbefore described is applicable to steam, gas, and air motors,
both for reversing and for variable expansion, and also to hydraulic motors and for
other purposes where such a valve gear is suitable.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. Valve gear of the kind herein referred to in which the eccentric rod E is
supported and its movements controlled by means of two radius rods 1, from a
rocking bar S adapted to be operated by the lever B from the reversing shaft.

page_text: substantially as hereinbefore described with reference to the several examples
shown in Figs. 1 to 10 inclusive of the drawings.
2. The modified construction of valve gear of the kind referred to, in which the
eccentric rod is supported and its movements controlled by means of a single radius
rod from the rocking bar which is adapted to be shifted by one or other or each
of two levers B, B₁ through the rocking bar S substantially as hereinbefore
described with reference to the several examples shown in Figs. 11 to 14 inclusive
of the drawings.
Dated this 11th day of December 1893.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.