Improvements in Valve Mechanism for Engines Operated by Steam or other Expansible Fluid.
Year: 1896

page_text: Date of Application, 24th Feb., 1896
Complete Specification Left, 1st May, 1896-Accepted, 27th June, 1996
PROVISIONAL SPECIFICATION.
Improvements in Valve Mechanism for Engines Operated by Steam
or other Expansible Fluid.
I, COURTENAY WILLIAM THOMPSON, of 30 College Road, Bromley, in the
County of Kent, Mining Engineer, do hereby declare the nature of this invention
to be as follows:-
The object of this invention is to operate the valve with the full value of the
eccentrics (or other operating devices) or with increased value and with less
angular lead. This result is effected by providing two links, one of which may be
a plain link, the other being a slotted link or other link such as may be used for
reversing or variable expansion and the like.
The accompanying diagrams illustrate examples of manners in which this
invention may be effected but I do not limit myself to the devices shewn.
In all
the figures N and O are a couple of reversing eccentrics, attached at A and B
respectively to the plain link A. B.
The pins C and D are situated in this link, the pin C being further from the
centre than A, and the pin D being further from the centre than B, the further
C and D are from the centre the less lead they will have and the greater travel.
The link A, B is connected to the slotted link E, F, by the rods C, E, and D, F.
The block H, connected to the valve spindle J slides in the link E, F. In
Figure 1 the link A, B, is supported by the rod R, C, and the link E, F, is
reversed by means of the reversing shaft S and the drag-link K, E. The gear is
in forward position and the block H has the equivation movement to that of A.
In Figure 2, the link A, B is supported by the rod R, T, pivotted at R, and
with this object the rod E, C, is extended to T. The link E, F, is reversed as in
the arrangement, Figure 1, but it will be seen that the link A, B, also partakes
somewhat of this movement which relieves the angling of the rod C, E, in
reversing, and, in this way the rods C, E, and D, F, may be still further shortened.
As shewn the guide X, for the valve spindle J, may be placed below the link E, F,
for steadiness. The link A, B, is shewn with a slot cut in it and a block Y,
slidably mounted in it; thus A, B, may be used as an auxiliary link; or another
link, such as the link E, F, may be added to this gear, one link behind the other,
and without increasing the width of the mechanism.
In Figures 3, 4, and 5, the rod D, F, which connects the two links A, B and E, F,
is constructed as a solid angle piece rigid with the drag-link K. D, F.
In Figures 3, 4, 5, and 6, the links are placed as close together as possible.
In Figure 3, the drag-link is attached to the centre of the rod D, F, and the
gear is in forward position.
In Figure 4, the drag-link is attached at the upper end of the
the gear is in mid position.
In Figure 5, the drag-link is attached at the lower end of the
the gear is in reverse position.
rod D, F, and
rod D, F, and
In Figure 6, the reverse eccentric rod is carried rigidly through B, to F; the
valve does not obtain the advantage of increased movement in reverse position;
the forward euds of the links are connected, as before, by the rod C. E; the gear
is shewn in reverse position.
These figures illustrate a few examples in connection with reversing links, and
eccentrics; but, for instance, if early cut off and late cut off movements be

page_text: connected at A, and B, corresponding results can be obtained by connecting two,
or more, links, together, and operating them by any equivalent means.
Dated this 24th day of February 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Valve Mechanism for Engines Operated by Steam
or other Expansible Fluid.
I, COURTENAY WILLIAM THOMPSON, of 30 College Road, Bromley, in the
County of Kent, Mining Engineer, 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 :-
The object of this invention is to operate the valve with the full value of the
eccentrics (or other operating devices) or with increased value and with less
angular lead. This result is effected by providing two links, one of which may be
a plain link, the other being a slotted link or other link such as may be used for
reversing or variable expansion and the like. The diagrams Figures 1 to 6
accompanying my Provisional Specification illustrate examples of manners in
which this invention may be effected but I do not limit myself to the devices
shewn and in the accompanying drawings I have illustrated further examples of
how my invention may be performed.
Referring first to the diagrams Figures 1 to 6 accompanying my Provisional
Specification N and O are a couple of reversing eccentrics attached at A and B
respectively to the plain link A. B.
The pins C and D are situated in this link the pin C being further from the
centre than A and the pin D being further from the centre than B, the further
C and D are from the centre the less lead they will have and the greater travel.
The link A B is connected to the slotted link E F by the rods C E and D F.
The block H is mounted slidably in the link E. F. and is connected to the valve
spindle J. In Figure 1 the link A B is supported by the rod R. C. and the
link E F is reversed by means of the reversing shaft S and the drag link K E.
The gear is in forward position and the block H has the equivalent movement to
that of A.
In Figure 2 the link A B is supported by the rod R. T pirotted at R and with
this object the rod E. C. is extended to T. The link E. F. is reversed as in the
arrangement Figure 1 but it will be seen that the link A B also partakes
somewhat of this movement, which relieves the angling of the rod C. E. in
reversing, and in this way the rods ('. E and D. F. may be still further shortened.
As shewn, the guide X for the valve spindle J, may be placed below the link E. F.
for steadiness. The link A. B. is shewn with a slot cut in it and a block Y
slidably mounted in it; thus A B. may be used as an auxiliary link; or another
link, such as the link E. F., may be added to this gear, one link behind the other
and without increasing the width of the mechanism.
In Figures 3, 4 and 5, the rod D. F, which connects the two links A. B.
and E. F is constructed as a solid angle piece rigid with the drag link K. D. F.
In Figures 3, 4, 5 and 6 the links are placed as close together as possible. In
Figure 3 the drag link is attached to the centre of the rod D. F, and the gear is
in forward position. In Figure 4, the drag link is attached at the upper end of
the rod D. F. and the gear is in mid position. In Figure 5 the drag link is
attached at the lower end of the rod D. F. and the gear is in reverse position.
In Figure 6 the reverse eccentric rod is carried rigidly through B to F; the
valve does not obtain the advantage of increased movement in reverse position;

page_text: the forward ends of the links are connected, as before, by the rod C. E.; the
gear is shewn in reverse position. These figures illustrate a few examples in
connection with reversing links and eccentrics; but, for instance, if early cut off
and late cut off movements be connected at A and B, corresponding results can
be obtained by connecting two or more links together and operating them by any
equivalent means. Figure 7 of the accompanying diagrams illustrates another
example of this gear; this is similar to Figure 1. except that the link A B. is
slotted to receive the block M, which operates the expansion or other suitable
auxiliary valve spindle P. The block M is controlled in its link in
convenient manner by hand or governor.
any
Figure 8 illustrates another example of this gear; it is similar to Figure 2
except that the block Z in the link A. B. operates the rocking shaft Y by the
arm Z Y; to the rocking shaft Y the rider link X is attached in which operates
the expansion valve block W; which operates the expansion valve spindle W'.
In this gear, Figure 8, the movement of the rider expansion link X bears the
same relation to that of the main valve both in forward and reverse work and this
gear operates with the essential features of that described in the Specification
of my application for Letters Patent No. 24439 and consequently is merely an
improvement on that mechanism. The block W is controlled in the link X in
any convenient manner by hand or governor. Instead of the link X being
attached to the rocking shaft Y, the rocking shaft Y may operate any auxiliary
valve by means of an arm suitably attached to it. Figure 9 illustrates another
example of the application of this gear; it is applied with the features described
in the Specification of my application for Letters Patent No. 1805°; A B. is
the shaft governor reversing link of my said arrangement according to my
application for Patent No. 1805 and also constitutes the auxiliary link according to
this present invention. This link A. B. transmits its movements, with increased
travel and with less lead, to the link E. F and the link E F is reversed through
the reversing shaft S. The link E F operates the block H which operates the
valve spindle J.
The foregoing examples will serve to clearly illustrate how this gear may be
adapted to operate in conjunction with a large variety of mechanisms.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. Linkage mechanism for engines operated by steam or other expansible fluid
the said mechanism being constructed with an intermediate or auxiliary link as
hereinbefore explained so that improved conditions of the eccentric lead and the
travel are provided in the principle operating link or links for main, expansion or
other auxiliary valves.
2. The various arrangements of mechanism substantially as and for the purposes
herein before described and illustrated by the several diagrams Figures 1 to 6
accompanying my Provisional Specification and Figures 7, 8 and 9 accompanying
this specification.
Dated this 1st day of May 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.