Improvements in Valve Mechanism for Three Cylinder Engines.
Year: 1884

page_text: Improvements in Valve Mechanism for Three Cylinder Engines.
I, DAVID JOY, of 8 Victoria Chambers, Westminster, Engineer, do hereby
declare the nature of said invention for "IMPROVEMENTS IN VALVE MECHANISM
FOR THREE CYLINDER ENGINES" to be as follows:-
This Invention has for its object the simplification of the valve motions of three
cylinder engines and consists in combining the motions of the valves of two of the
cylinders so as to obtain therefrom as a resultant a suitable motion for the third
valve. The valve gear so combined may be of any suitable kind and the
combination may be effected by a lever or any other suitable mechanism.
J. HENRY JOHNSON,
Agent for the said David Joy.

page_text: The following are descriptions with reference to the accompanying drawings of
ways in which my Invention may be conveniently carried out in practice.
Figures 1 and 2 are longitudinal and end views of a set of triple cylinder
engines arranged according to my Invention; here I apply my ordinary or other
suitable valve gear to the high pressure cylinder A and to the low pressure 5
cylinder C. the valve spindles of which are marked respectively A¹ and O' and I
couple these together by a floating lever or rod L the contre of which is coupled
to the valve spindle B₁ of the intermediate cylinder B which so receives its motion
from the motions of the valves of the two cylinders A and C and this is the correct
motion (reduced and reversed as to steam and exhaust openings) for forward or 1
backward gear and for all intermediate points of expansion-Instead of coupling
the valve gear of the two outer cylinders either of the outer gears may be coupled
with the inner gear as illustrated in Figure 3 and the resultant motion may be
carried to the remaining valve spindle by the additional lever L¹ or one of the
outer valve gears and the middle one may be coupled as in figure 4 and the samė 1
lever L be prolonged to operate the valve spindle of the remaining cylinder. In
any of these combinations the relative positions of the valve spindles may be
arranged to give the required amount of stroke for the valve. Or the valves may
be proportioned, as to lap, lead, and port, opening, and for admission of steam
from outside or inside, as is rendered necessary by the combination of levers 2
employed.
Figure 5 is the side view, and Figure 6 is the plan of a goods engine and
Figure 7 is a side view of a passenger engine, to which my Invention is shewn
applied, two of the valves of a three cylinder engine receiving direct motion and
the third being driven by the resultant motion of these two valves through a 1
coupling lever L.
In any of these cases instead of employing my own valve motion for the two
valves directly actuated, the link gear or any other reversing motion may be
employed,
In the locomotives the three cylinders may if desired be arranged as a compound
engine.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
In steam or other fluid pressure engines combining the motions of the valves of
two of the cylinders so as to obtain a motion for the valve of the third cylinder
substantially as hereinbefore described, and also the particular arrangements for the
purpose illustrated by the accompanying drawings.