IMPROVEMENTS IN VALVE GEAR FOR DUPLEX STEAM' ENGINES
Year: 1885

page_text: I, LEON BERNARD CARRICABURU, of No 32 West 31st Street, in the City and
State of New York, United States of America, Inventor, do hereby declare the
nature of said invention for IMPROVEMENTS IN VALVE GEAR FOR DUPLEX STEAM'
ENGINES, to be as follows:
In steam engines there has been used a boss or tappet upon the piston rod and a
rocking lever connected to the valve rod and with which rocking lever the tappet
has come in contact near the ends of the stroke to shift the said rocker and move
the valve.
Valve gear of this general character is shewn in Letters Patent No 11,428 granted
to me in Great Britain under date of August 19, 1884.
According to my present invention I duplex the valve gear before described and
arrange the parts so that there are two steam cylinders side by side and a valve
chest and valve to each.
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2
There is also a tappet on each piston rod and a rocker lever to be acted upon by
the same, but the rocker-lever instead of being connected to the valve of the engine
by which it is moved, is connected to the valve of the adjacent engines, the con- .
nections being crossed so that the piston rod and tappet of the first engine moves
the valve of the second engine and the reverse.
This improvement is especially available in duplex engines that actuate pumps
because it allows each engine and pump to move the full stroke and just before the
termination of one stroke the other engine is started' thereby maintaining perfect
uniformity in the flow of the water. I construct the parts so that the rocker levers,
links, valve rods and connections correspond, so that the engine is simple, inexpensive
and easily repaired.

page_text: I, LEON BERNARD CARRICABURU, of N° 32 West 31st Street, in the City and
State of New York, United States of America, Inventor, 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, reference
being had to the accompanying drawings, and to the letters and figures marked
thereon, that is to say :-
In steam engines there has been used a boss or tappet upon the piston rod and a
rocking lever connected to the valve rod, and with which rocking lever the tappet
has come in contact near the ends of the stroke to shift the said rocker and move
the valve. Valve gear of this general character is shewn in Letters Patent
No 11,428 granted to me in Great Britain under date of August 19, 1884.
According to my present invention I duplex the valve gear, before described, and
arrange the parts so that there are two steam cylinders side by side and a valve
chest and valve to each.
There is also a tappet on each piston rod and a rocker lever to be acted upon by
the same, but the rocker lever instead of being connected to the valve of the engine
by which it is moved, is connected to the valve of the adjacent engine, the con-
nections being crossed so that the piston rod and tappet of the first engine moves
the valve of the second engine, and the reverse.
This improvement is especially available in duplex engines that actuate pumps,
because it allows each engine and pump to move the full stroke and just before the
termination of one stroke, the other engine is started, thereby maintaining perfect
uniformity in the flow of the water. I construct the parts so that the rocker levers,
links, valve-rods, and connections correspond, so that the engine is simple, inexpensive,
and easily repaired.
In the drawings, Figure 1, is a plan view of the duplex engine and rockers, with
the steam chests in section, and with the standard for the right angle levers partly
removed. Fig. 2, is a cross section through the piston rods, shewing the rockers
and connections to the valves, in elevation.
The cylinders A, B, piston rods C, D, and valve chests. E, F, are to be of any
desired character, and the valves in the respective valve chests may be such as
shewn in my British Patent N° 11,427 of August 19, 1884, or of any other known
description.
:
The rockers G and H, are pivoted upon a standard K, or other suitable support,
and upon the piston rods C, D, respectively, are the tappets L. M. These rockers G
and H, may correspond to the length of stroke of the engine, or the distance
between the inclined cam portions may be shorter, and these rockers are moved by
the tappets L, M, respectively.
Between the rockers G, H, and the valve rods N, O, there are cross connections,
so that the rocker H, of the engine B, actuates the valve rod N, of the engine A,
and the rocker G, of the engine A, operates the valve rod O, of the cylinder B.
The connections between the respective parts may be of any suitable character,
according to the style of engine.

page_text: I have shewn bent or right angle levers P and Q, pivoted at 2, 3, upon a
standard R. These levers stand in opposite positions, the nearly horizontal ends
being connected by links S, T, with the respective rockers, and the valve rods N, O,
are united by links to the upper ends of the respective levers P, Q. By this
arrangement the parts will not interfere with each other at the points of crossing,
and the same parts for one engine are duplicated and interchangeable for the other
engine.
In cases where the rockers have arms extending up from the middle above the
pivots, as in my said patent N° 11,428, the connections can be made directly from
the upper ends by a link to the valve rods; but these arms will require to be placed
in such a manner, or bent, in order that they may not interfere with each other in
crossing; and where the valves are moved by connections to rock shafts and crank
arms, as in the duplex pumping engines heretofore made, each rocker may be placed
vertically above the piston rod, as in my aforesaid patent, so as to apply my
improvement to this class of pumping engines.
The valves of the engines may be of any desired character, but it is preferable to
employ valves and ports, such as shewn in my said Patent No 11,427, in order that
each piston may be cushioned at each end of the strokes and stop without any
concussion after having moved the valve of the adjoining engine.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1. The combination, with the valve rods and piston rods in a duplex engine, of
two rockers and tappets upon the piston rods, and connections that cross from.
the rocker of one engine to the valve rod of the other engine, substantially as
specified.
2. The combination of the rockers G, H, and tappets L, M, the cylinders A, B,
valve chests, and valve rods N, O, levers P, Q and links S, T, crossing from one
engine to the other, substantially as set forth.
3. The combination with the two rockers G, H, and the tappets and piston rods
for moving the same, of the bent levers P, Q, valves and connections to these
levers, and the links S, T, connecting the rockers to the bent levers, substantially
as specified.
4. The combination with the two engines and their valves, of rockers and links,
and bent levers standing in opposite directions and connected at their upper ends
to the valve rods, and at their lower ends to the rockers, substantially as specified.
Dated this 5th day of April 1886.