Improvements in or relating to Reversing Valve Gear.
Year: 1891

page_text: Date of Application, 3rd Nov., 1891
Complete Specification Left, 2nd Aug., 1892-Accepted, 3rd Sept., 1892
V.
PROVISIONAL SPECIFICATION.
Improvements in or relating to Reversing Valve Gear.
I, ANDREAS RADOVANOVIC of Pilsen, Bohemia, Austria, do hereby declare the
nature of this. invention to be as follows:-
This invention has reference to reversing valve gear of the type in which a point
of the eccentric-rod that operates the slide valve rod, is compelled to move, along
a line, by the variable position of which the path of the eccentric rod, and thereby
also the law of motion of the slide valve, is determined.
According to this invention the guiding of a point of the eccentric rod is effected
by means of a disc or a ring situated in the plane of the said rod. and capable of
partial rotation therein. In the former case a block capable of sliding relatively
to the disc and hereinafter called the slide block, is either keyed on the reversing
shaft or fixed to the disc; this slide block is movable in a suitably arranged guide,
and when the reversing shaft and disc are turned through any angle, the said slide
block is turned through the same angle as the shaft. In the second: case, where a
ring is employed, the turning of the ring, when the reversing shaft is, turned
through any angle, is effected by suspending the ring in an arm or arms surrounding
the same.
Since, when the eccentric is rotated, the eccentric rod is compelled to. follow the
position at the time of the slide-block guide or ring, a point at the end of the
eccentric rod will, in accordance with the varying position of the slide block or
the ring, describe various curves, which produce various movements of the steam
distributing device.
The accompanying drawings illustrate various ways of carrying. out my
invention.
Figs. 1, 2 and 3 are respectively an elevation partly in section, a vertical section
and a horizontal section of a reversing valve gear with straight guide, in which the
slide-block guide is formed in a disc capable of rotary motion in the eccentric rod,
whilst the slide block is keyed on the reversing or governor shaft.
Figs. 1 and 1 shew diagrammatically the positions of the various parts of the
valve gear in the two extreme positions of the reversing lever.
Figs. 4, 5 and 6 shew in a similar manner to Figs. 1-3, another construction of
reversing valve gear according to this invention.
Figs. 4 and 5 shew two elevations. corresponding to Figs. 4 and 5, respectively
of a further modification.
Figs. 7-13, illustrate a number of modified constructions of reversing valve gear
according to this invention, in which the slide block guide is mounted on the
reversing shaft, and the slide block is fixed in the disc which is, capable of rotary
movement in the eccentric rod.
Figs. 14-18 shew two arrangements of reversing valve gear with a ring capable
of rotation in the eccentric rod, and suspended from an arm or. arms, the said ring
being also adapted to be oscillated.
Referring to Figs. 1-3, inclusive, a is an eccentric keyed on the valvo.actuating
or crank shaft A, and enclosed by an eccentric.strap b' one half of. which is made
in one piece with a ring and arm 3, and forms with these the eccentric rod.
Within the ring portion of the eccentric rod, there is mounted, so as to be
capable of rotation, a disc e in which is a hole c', herein called the slide-block guide,
for the reception of a slide block 2 that is keyed on the reversing shaft c³. This
slide block guide c¹ passes diametrically through the disc c so that the latter slides
to and fro on the slide block c* the movement of which is not interfered with by
the disc, even when, as in the least favorable case shewn in Fig. 1, the length L of
с

page_text: the slide block is equal to the diameter D of the disc less the greatest stroke s that
is to say 2.
17
When the reversing lever mounted on the reversing shaft, is turned into its
extreme upward position (Fig. 14), the disc c is then, also correspondingly rotated
by the slide block c².
On rotation of the valve-actuating shaft A in the direction of the arrow a,
(Fig. 1A) the centre of the eccentric a will move in the circle 1, 2, 3, 4, 5, about
the centre of the shaft A, and the centre of the ring portion of the eccentric rod
will in consequence of the slide block more along the axis z-z of the slide block
guide c¹, and passes through the points o¹, o²; 0, 0, in the respective
positions 2, 3, 4, 5 of the eccentric centre. During such rotation of the eccentric
the axis uu of the eccentric rod will assume the positions Fo', 20, 30, 40, 50º,
thereby causing the point n at the end of the eccentric. rod, to which the valve
rod is fastened, to describe the curve 1, 2, 3, 4, 51, in the direction of the
arrow...
Ty
.
This curve will vary for each position of the reversing lever and the corre-
sponding position of the slide block c² and slide block guide c; and will: assume,
when the reversing lever is moved into its other extreme position, shewn in Fig. 1",
the form of the curve shewn in that figure.. 774
The valve actuating shaft A, Fig. 1B, rotates in the direction of the arrow B.
and the axis of the eccentric.rod assumes successively 'the positions 1; 1', 2, 2',
3, 3, 4, 4, 5, 5, 6, 61, 7, 71, the point. n'moving in the direction of the arrow ẞ'.
In all possible positions of the reversing lever intermediate to the end positions
shewn in Figs. 1 and 1³, the point n will describe other curves, and its amplitudes
will become smaller as the reversing lever moves nearer to its middle position.
The movement of the eccentrica can therefore take place either according to a
circle, as in the present case, or according to any other curve (deduced motion).
.In order to prevent lateral movement of the eccentric rod on the disc c, the rod
is provided either with an inwardly directed flange (Fig. 2) against which the
disc c bears, being held by a ring secured on the rod; or the rod is retained in
place by means of two rings secured on opposite sides of the eccentric rod
as shown in Fig. 5. Or the lateral movement of the eccentric rod relatively to
the disc c can be prevented by a construction somewhat similar to a bayonet-joint
as shown in Figs. 44 and 4º, wherein the disc c is provided with projections c
which after the disc has been inserted within the ring portion of the eccentric
rod by passing the projections c at one side of the disc through recesses in the
guiding portion;rare turned partly round. and into the position shewn so as not to
be opposite. the recesses, thereby effectnally preventing lateral motion of the
eccentric rod relatively to the disc.
.i
In order to obtain a slide block as long as possible, the ring portion 6 is formed
with recesses yy, as shewn in Fig. 4, which may be open or closed laterally, and in
which the slide block is free to move in its trável. The recesses shewn in Fig. 4^
also serve the same purpose.
Instead of fixing the slide block on the reversing shaft, it may be fixed in the
part c which may then be in the form of a ring as shewn in Figs. 7, 8 and 9. In
this case the slide block guide c¹ is fixed on the reversing shaft, and the whole is
surrounded by the ring portion 62 of the eccentric rod.
The hereinbefore described constructions of the reversing gear admit of various
modifications of the cross sectional forms of the slide blocks; and the constructions
of the arrangement shewn in Figs. 7-13, also allow of various modes of fixing
the slide block guide on the reversing shaft. The slide block guide may be straight
(Figs. 7-12) or curved (Fig. 13).
When the guiding of a point of the eccentric rod is effected by means of a ring
capable of being oscillated within the rod, this ring * which replaces the disc or
part shewn in the previously described arrangements, is suspended from an arm f
(Figs. 14, 15 and 16) or from two arms ce, Fig. 17, which is or are constructed
to form a bearing enclosing the ring e. The arm for arms c is or are keyed on a

page_text: pin i which is connected by links k with the reversing shaft ³. The eccentric rod
is made of fork-shape when the ring e* is suspended from an arm (Figs. 14, 15
and 16), but when the ring is suspended by means of two arms etc (Figs. 17 and 18),
the ring portion 2 need not be forked. With this arrangement as the ring c* is
enclosed by the eccentric rod, when the reversing lever is partly rotated, the ring c
will be caused to oscillate and by the more or less eccentric position of the same"
with relation to the reversing shaft the end point of the eccentric rod will by the
rotation of the eccentric a, be compelled to describe various curves by means of
which various motions of the steam distributing device will be produced similar
to those produced when a disc and a slide block are used. The adjustment of the
worn bearings for the arms is possible only in the direction of the force (Fig. 14).
In the hereinbefore described constructions of reversing gear the valve-actuating
or crank shaft A, the centre of the disc c or of the ring e*, and the points of
connection m, n, of the steam distributing devices may be situated in any triangle
or rectangle more than one steam distributing device can be operated from one
eccentric, and the disc centre or ring centre need not coincide with the centre of
the reversing shaft. The gear may also be employed only for adjusting the
expansion or compression.
Dated this 3rd day of November 1891.
ANDREAS RADOVANOVIC,
By L. W., per F. B.
COMPLETE SPECIFICATION.
+
Improvements in or relating to Reversing Valve Gear..
I, ANDREAS RADOVANOVIC of Pilsen, Bohemia, Austria, 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 has reference to reversing valve gear of the type in which a
point of the eccentric lever that operates the slide valve rod, is compelled to move
along a line, by the variable position of which the path of the eccentric lever and
thereby also the law of motion of the slide valve, is determined.
According to this invention the guiding of a point of the eccentric lever is
effected by means of a disc or a ring situated in the plane of the said lever and
capable of partial rotation therein. In the former case a block capable of sliding
relatively to the disc and hereinafter called the slide block, is either keyed on the
reversing shaft or fixed to the disc; this slide block is movable in a suitably.
arranged guide, and when the reversing shaft and disc are turned through any
angle, the said slide block is turned through the same angle as the shaft. In the
second case where a ring is employed, the turning of the ring, when the reversing.
shaft is turned through any angle, is effected by suspending the ring in an arm or
arms surrounding the same.
Since, when the eccentric is rotated, the eccentric lever is compelled to follow
the position at the time of the slide-block guide or ring, a point at the end of
the eccentric lever will, in accordance with the varying position of the slide
block or the ring, describe various curves, which produce various movements of
the steam distributing device.
Referring to the drawings filed with my Provisional Specification which illustrate
various ways of carrying out my invention;
Figs. 1, 2 and 3 are respectively an elevation partly in section, a vertical section
and a horizontal section of a reversing valve gear with straight guide, in which the
slide-block guide is formed in a disc capable of rotary motion in the eccentric lever,
whilst the slide block is keyed on the reversing or governor shaft.
Figs. 1A and 1B shew diagrammatically the positions of the various parts of the
valve gear in the two extreme positions of the reversing lever.

page_text: jigs. 4, 5 and 6 shew in a similar manner to Figs. 1-3, another construction Q1
reversing valve gear according to this invention.
Figs. 4 and 5 shew two elevations corresponding to Figs. 4 and 5, respectively
of a further modification.
Figs. 7-13, illustrate a number of modified constructions of reversing valve gear
according to this invention, in which the slide block guide is mounted on the
reversing shaft, and the slide block is fixed in the disc which is capable of rotary
movement in the eccentric lever.
Figs. 14-18 shew two arrangements of reversing valve gear with a ring capable
of rotation in the. eccentric lever and suspended from an arm or arms, the said ring
being also adapted, to be oscillated.
Referring to Figs. 1-3, inclusive, a is an eccentric keyed on the valve actuating
or crank shaft A, and enclosed by an eccentric strap 61 one half of which is made
in one piece with a ring 62 and arm 63,, and forms with these the eccentric lever.
Within the ring portion of the eccentric lever, there is mounted, so as to be
capable of rotation, a disc c in which is a hole c', herein called the slide-block
guide, for the reception of a slide block c² that is keyed on the reversing shaft c³.
This slide block guide el passes diametrically through the disc c so that the latter
slides to and fro on the slide block the movement of which is not interfered
with by the disc, even when, as in the least favorable case shewn in Fig. 1, the
length L of the slide block is equal to the diameter D of the disc less the greatest
stroke-s that is to say-2.
When the reversing lever c mounted on the reversing shaft, is turned into its
extreme upward position (Fig. 1^), the disc c is then also correspondingly rotated
by the slide block c².
Q
a
On rotation of the valve-actuating shaft A in the direction of the arrow
(Fig. 14) the centre of the eccentric a will move in the circle 1, 2, 3, 4, 5, about
the centre of the shaft A, and the centre of the ring portion 62 of the eccentric
lever will in consequence of the slide block, move along the axis of the slide
block guide c¹, and pass through the points o¹, o³, 03, 04, 0 in the respective
positions 1, 2, 3, 4, 5.of the eccentric centre. During such rotation of the eccentric
the axis of the eccentric lever will assume the positions 1, o¹; 2, 0²; 3, 0³ ;
4, 0; 5, o; thereby causing the point à at the end of the eccentric lever, to which
the valve rod is fastened to describe the curve 11, 21, 31, 4, 5¹, in the direction. of
the arrow a¹.
This curve will vary for each position of the reversing lever c and the corre-
sponding position of the slide block and slide block guide e', and will assume,
when the reversing lever is moved into its other extreme position, shewn in Fig. 1B,
the form of the curve.shewn in that figure.
n
The valve actuating shaft A, Fig. 1", rotates in the direction of the arrow. B,
and the axis uu of the eccentric lever assumes successively the positions 1,. 1';
2, 21; 3, 31; 4, 4' ; .5, 5¹; 6, 61; 7, 71; the point moving in the direction of the
arrow 3. In different positions of the reversing lever " intermediate to the
extreme positions shewn in Figs. 1A and 1B, the point n will describe other curves,
whose amplitudes will become smaller as the reversing lever c moves nearer to its
middle position. The movement of the eccentric a can take place either according
to a circle, as in the present case, or according to any other curve (deduced
motion.).
In order to prevent lateral movement of the eccentric lever on the disc
C the
lever is provided either with an inwardly directed flange 64 (Fig. 2).against which
the disc c bears, being held by a ring c secured on the lever, or the disc,c is
retained in place by means of rings or flanges csecured on opposite sides of the
eccentric lever as shewn in Fig. 5 or the lateral movement of the eccentric lever
relatively to the disc c can be prevented by a construction somewhat similar to a
bayonet-joint as shewn in Figs. 4 and 5, wherein the disc c is provided with
projections which after the disc has been inserted within the ring portion of
the eccentric lever by passing the projections c at one side of the disc through

page_text: recesses in the guiding portion, are turned partly round and into the position
shewn so as not to be opposite the recesses, thereby effectually preventing lateral
motion of the eccentric lever relatively to the disc.
In order to obtain a slide block as long as possible, the ring portion 6* is formed
with recesses x, y, as shewn in Fig. 4, which may be open or closed laterally, and
in which the slide block is free to move in its travel. The recesses shewn in
Fig. 4 also serve the same purpose.
Instead of arranging the slide block on the reversing shaft, it may be fixed in the
part which may then be in the form of a ring as shown in Figs. 7, and 9. In
this case the slide block guide c¹ is fixed on the reversing shaft c³, and the whole is
surrounded by the ring portion of the eccentric lever.
•
The hereinbefore described constructions of the reversing gear admit. of various
modifications of the cross sectional forms of the slide blocks; and the constructions
of the arrangement shewn in Figs. 7-13, also allow of various modes of fixing the
slide block guide on the reversing shaft. The slide block guide may be straight
(Figs. 7-12) or curved (Fig. 13).
*
When the guiding of a point of the eccentric lever is effected by means of a ring
capable of being oscillated within the rod, this ring (c) which replaces the disc or
part c shewn in the previously described arrangements, is suspended from an arm f,
(Fig. 14 15 and 16) or from two arms cc, Fig. 17, which is or are constructed to
form a bearing enclosing the ring *. The arm for arms c is or are keyed on a
pin which is connected by links k with the reversing shaft c³. The eccentric
lever is made of fork-shape when the ring is suspended from an arm ƒ (Figs. 14,
15 and 16), but when the ring is suspended by means of two arms c* c¹ (Figs. 17
and 18) the ring portion need not be forked. With this arrangement as the
ring c
is enclosed by the eccentric lever when the reversing lever is partly rotated,
the ring will be caused to oscillate and by the more or less eccentric position of
the same with relation to the reversing shaft the end point of the eccentric lever will
by the rotation of the eccentric a be compelled to describe various curves by means
of which various motions of the steam distributing device will be produced similar
to those produced when a disc and a slide block are used. The adjustment of the
worn bearings for the arms is possible only in the direction of the force (Fig. 14).
In the hereinbefore described constructions of reversing gear the valve-actuating
or crank shaft A, the centre of the disc cor of the ring c* and the points of
connection m, n, r, of the steam distributing devices may be situated in any triangle
or polygon; more than one steam distributing device can be operated from one
eccentric, and the disc centre or ring centre need not coincide with the centre of
the reversing shaft. The gear may also be employed only for adjusting the
expansion or compression.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:―
c
1. In a reversing valve gear in which a point of the eccentric lever that operates
the slide valve rod is guided by means of a disc or a ring situated in the plane of
the said lever and capable of partial rotation, the arrangement of the slide block-
guide for the slide block 2 keyed upon the reversing shaft 3, the said guide
passing diametrically through the disc c, substantially as and for the purposes set-
forth.
2. In a reversing valve gear in which a point of the eccentric lever that operates
the slide valve rod is guided by means of a disc or a ring situated in the plane of
the said lever and capable of partial rotation the arrangement of the slide block
guide c¹ on the reversing shaft c³, the slide block being fixed in the ring formed
part c substantially as and for the purposes set forth.
3. In a reversing valve gear in which a point of the eccentric lever that operates
the slide valve rod is guided by means of a disc or a ring situated in the plane of
the said lever and capable of partial rotation, the arrangement of a ring c* instead

page_text: of a disc, the said ring being suspended from an arm for from arms etc,
constituting a bearing surrounding the ring, so that by operating the reversing
shaft the ring c* is caused to oscillate substantially as and for the purposes
.described.
4. The improvements in reversing valve gear substantially as hereinbefore
described with reference to Figs. 1 to 3 ; to Figs. 4, 5 and 6 ; to Figs. 4^ and 5ª ;
to Figs. 7 to 13 inclusive; and to Figs. 14 to 18 inclusive; of the accompanying
drawings for the purposes specified.
Dated this 2nd day of August 1800
A. RADOVANOVIC,
By L. W., per F. B.