Year: 1888

page_text: I, GEORGE JOHN CAVAN D'URBAN SKINNER, of Burnaby Villa, Claremont Road,
Highgate, in the County of Middlesex, Engineer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to improvements in the slide valves of fluid pressure engines,
and is more particularly adapted for use with reciprocating piston engines in which
the piston rod is connected direct to the crank without the intervention of a con-
necting rod.
In carrying my invention into effect, I provide a valve chest upon the back of the
cylinder cover, preferably circular in cross section, to which the motor fluid is
admitted in any convenient way.
•
I form a hemispherical cavity in the slide valve in which sits a ball bored out to
allow the piston rod to pass through it. Suitable stuffing boxes are provided for tho
slide valve and the ball, and a longitudinal opening is formed in the cover of the valve
chest to admit of the throw of the piston rod, the motion of which to the right and
left of the axis of the cylinder is transmitted by means of the above mentioned ball
and socket device to the slide valve.
The ports for the passage of the motor fluid through the chest are formed either in
the periphery of the slide valve, or through it, as may be convenient.
The ports from the valve chest to the cylinder are, preferably, formed in the
cylinder side, and any suitable type of reversing valve may be used in combination
with the above described special constructions.
The slide valve may be packed, if desired, in the following manner. Longitudinal
strips are let into its periphery, and packing rings are recessed into the strips and
valve, so that the resilience of the said rings shall keep the strips in contact with the
internal face of the valve chest.
2
1 1000
PHILLIPS & LEIGH,
Agents for the Applicant.

page_text: I, GEORGE JOHN CAVAN D'URBAN SKINNER, of Burnaby Villa, Claremont Road,
Highgate, in the County of Middlesex, Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly de-
scribed and ascertained in and by the following statement:-
My invention relates to improvements in the slide valves of fluid pressure engines; 5
and is more particularly adapted for use with that class of reciprocating piston engines
in which the piston rod is connected directly to the crank without the intervention of
a connecting rod.
.
In order that my invention, and the means by which the same can be carried into
practical effect, may be thoroughly understood, I will now describe it in detail
referring in so doing to the accompanying drawings which are to be taken as part of
this specification and read therewith.
Fig. 1 is a side elevation, half in section, illustrating the application of my inven-
tion to a cylinder fitted with an ordinary D valve.
Fig. 2 is a front elevation, partly in section, illustrating in detail the construction 1
of my improved slide valve, cavity, and ball.
Figs. 3 and 4 illustrate a modified construction of the slide valve shewn in Figs. 1
and 2.
Fig. 5 is a sectional side elevation taken on the line AB of Fig. 6 and illustrates
the embodiment of the distribution of the motor fluid in my improved slide valve.
Fig. 6 is a sectional plan taken on the line C-D of Fig. 5.
Figs. 7 and 8 illustrate a modification of the slide valve shewn in Figs. 5 and 6,
omitting the steam ports.
+
Fig! 9 is a transverse vertical section and illustrates a further modification.
Referring to Figs. 1 and 2, E is the working cylinder; e, an ordinary D valve; 12
F, the piston; and f, the piston rod connected to the piston by a suitable ball-and-
socket joint The piston is provided with suitable guides f2.
G is the cylinder of my improved slide valve. It is formed upon, and preferably
in one piece with, the cover of the working cylinder; the axes of the two
cylinders being at right angles with each other, and that of the valve-cylinder in
the same plane as the throw of the piston rod; so that, as the piston rod throws
through the valve, it will move the latter to and fro within its cylinder.
The slide valve H is cylindrical in cross section. It is sufficiently long to protrude
through the stuffing boxes hh, at any point of its stroke.
I is a ball bored out to allow of the piston rod f working through it. Suitable a
packing is provided between the said ball and rod. A suitable cavity is formed in
the slide valve H, in which the ball I works to and fro about its horizontal axis.
Proper packing is provided between the ball and valve.
Jis a slot in the valve-cylinder G, and is of a proper length to allow of the throw
of the piston rod. This slot is packed against the escape of steam by a packing j.
Referring to Figs. 3 and 4, the valve cylinder G is long enough, to contain the
valve H; and has, consequently, both ends closed.. The packing illustrated consists
of rings kunder strips k both recessed into the surface of the valve.
Referring to Figs. 5 and 6, live
through G
steam is supplied to the valve cylinder G¹,

page_text: Gis an ordinary reversing valve, such as is described in my former specification
No. 32391887 in reference to Fig. thereof; and G* is the exhaust.
The steam supply flows through the port g' in the valve G³ into the working
cylinder E, alternately above and below the piston F, through the respective
ports, h. The latter are formed either through the body, or in the periphery
of, the improved slide valve H. Snitable continuations of the said ports are formed
in the side of the working cylinder.
The connection between the piston F and the improved slide valve H in the
construction illustrated in Figs. 5 and 6 is substantially the same as illustrated in the
foregoing figures and described therewith.
Referring to Figs. 7 and 8, the construction and operation of the improved
slide valve illustrated therein are substantially the same as those of the valve illus-
trated in the foregoing figures 3 and 4.
According to the modification illustrated in Fig. 9, the improved slide valve is
made as to the central portion thereof in two sections ³, h, the latter being re-
movable. The ball is likewise made in two hemispheres ³, i. K is a spring fitted
within a special cavity in the ball; and adapted, by its resilience, to press the re-
spective halves of the ball and valve outwards towards the valve cylinder. This con-
struction permits of the ball being inserted and working tight in its cavity without
laving recourse to a separate gland.
I wish it to be distinctly understood that I am quite aware that it has been hereto-
fore proposed to dispense with the ordinary connecting rod, and to connect the piston
directly to the crank, making due provision for the throw of the piston rod by
jointing it to the piston, and making the cylinder cover to slide to and fro upon the
cylinder-end, which has been arc shaped accordingly.; but I make no general claim to
this general method of altering the piston, piston rod, and cylinder-cover, and their
mutual relationships in respect of construction, to compensate for the absence of the
connecting rod; but
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. The combination of slide valve, piston rod, and valve-cylinder, as set forth with
reference to Fig. 1 and 2.
2. The combination of slide valve having ports therein, piston rod, and valve-
cylinder, as set forth with reference to Figs. 5 and 6.
3. The combination of divided slide valve, divided ball, internal spring and piston
rod, as set forth with reference to Fig. 9.
4. In fluid pressure engines of the class hereinbefore specified, closing the cylinder
cover through which the piston rod works, by a slide valve, for the purpose of pre-
venting the escape of the motor fluid, the said slide valve being adapted to receive
from the said piston rod, and the said piston rod adapted to impart to the said slido
valve, a linear reciprocating motion in a plane at right angles to the axis of the
working cylinder, and within a valve-cylinder formed upon or combined with the said
cover, as illustrated.
1
1000