Year: 1897

page_text: Date of Application, 18th May, 1897-Accepted, 7th Aug., 1897
woject of my invention is to provide an adjustable connection between
the valve rods and the walking beams, whereby the valves may be readily set to
their seats.
In the accompanying drawing,-
Figure 1 is a longitudinal sectional view of a steam engine cylinder equipped
with my improvements;
Figure 2 is a detail perspective of the lower end of the valve rod;
Figure 3 is a detail perspective of one of the cylinder heads and the valve
casing;
Figure 4 is a detail perspective of the valve; and
Figure 5 is a similar view of the cover for the valve casing.
1 denotes a steam cylinder and 2 the heads. These heads are formed with
ports 31, each of which alternately serves as surly and exhaust ports, and above
the ports 31 are formed the auxiliary ports 121. Bolted to the cylinder heads are
valve boxes 4, provided with inlet pipes 5 connected with a steam supply pipe 6,
and with ports 3 and 12 registering with the ports 31 and 12¹.
At the opposite sides the valve boxes are provided with outlet pipes 6ª, which
carry the exhaust steam to any point desired. Located in each of these boxes is
a slide valve 7, consisting of a box open at one side and one end, and provided with
two bridges 8, carrying an auxiliary valve 9 adapted to open and close the port 12.
Secured to the upper sides of these valves are longitudinal strips 7, provided
with transverse notches 7b, which receive the lower T-shaped ends 9* of the valve
rods 10, which are vertically adjustably connected at their outer ends with an
oscillating lever or walking shaft 11. This walking shaft has an oscillating or
reciprocating movement up and down, so as to alternately raise and lower the
valves.
The operation is as follows: In the position shown in Fig. 1, the piston is on
its forward stroke, the port at the right of the cylinder being open or in communi-
cation with the valve-chest, so that steam will enter the cylinder unerethrough, the
auxiliary exhaust-valve at this end being closed and the auxiliary valve at the
other end being open. The port at this, or the left end of the cylinder, is in align-
ment with the open side of the valve, through which and the auxiliary valve,
steam in the cylinder exhausts through the open end of the valve into the exhaust-
pipe. When the piston reaches the end of its stroke, the valves will be reversed
by the walking beam, the one to the left being raised, opening communication

page_text: between the steam or valve box and the port in the end of the cylinder, and
allowing the steam to enter the cylinder, through said port. At the same time the
auxiliary port will be closed, and the auxiliary exhaust port at the opposite end
of the cylinder will be opened, and the main port will also be placed in com-
munication with the exhaust-opening in the slide-valve.
When it is desired to adjust the valves to compensate for wear, by turning the
valve rods 10, they will be screwed up or down so that the valve may be adjusted
with nicety to the ports in the cylinder head, and when it is desired, the valve rods
may be easily detached from the valves.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:
1. The combination with the cylinder of a steam engine having ports at its ends,
which alternately act as inlet and outlet ports, of valve boxes at the ends of the
cylinder having inlet and outlet pipes, and ports corresponding to those in the
heads of the cylinder, slide valves having open sides and open ends, and provided
en their upper edges with strips having slots, and valve rods having cross heads at
their lower ends which engage said slots, and means for alternately reciprocating
said valve rods, substantially as set forth.
2. The combination with the cylinder of a steam engine having ports at its
ends, which alternately act as inlet and outlet ports, of valve boxes at the ends
of the cylinder having inlet and outlet pipes, and ports corresponding with those
in the heads of the cylinder, slide valves having open sides and open ends, and
provided on their upper edges with strips having slots, and vertically adjustable
valve rods having cross heads at their lower ends which engage said slots, and
means for alternately reciprocating said valve rods, substantially as set forth.
Dated this 18th day of May 1897.
WHEATLEY & MACKENZIE,
Agents.