IMPROVEMENTS IN SLIDE VALVES OR MEANS FOR DISTRIBUTING ACTUATING FLUID IN ENGINES
Year: 1884

page_text: TAUVISIONAL SPECIFICATION.
We JAMES JOHN MILLER, and GERALD JOHN TUPP, both of Creek Works,
Hammersmith in the County of Middlesex, Engineers and Boat Builders, do
hereby declare the nature of said invention for "IMPROVEMENTS IN SLIDE VALVES
OR MEANS FOR DISTRIBUTING ACTUATING FLUID IN ENGINES" to be as follows:—
In the provisional specification of our application for Letters Patent No 2158
bearing even date herewith is described an improved construction of engine
together with arrangements for admission and emission of actuating fluid thereto
and therefrom, That provisional specification is accompanied by a sheet of
drawings wherein the figures are numbered 1, 2, 3 and 4. The present invention
is applicable to such engines and we will number the several views of the slicet of
drawings accompanying the present specification Figs 5, 6, 7 and 8 respectively.
According to this invention where it is desired to be able to reverse whilst the
engine is running we use an improved arrangement such as illustrated in Figs 5
to 8, according to which a slide is provided with a back adjustablo in relation to
the slide so that by shifting the said back longitudinally the actuating fluid passing
through the ports may be reversed. In this arrangement there is a cylinder face
with ports QQ'Q' the two outside ports Q Q leading to the respective ends of
the cylinder and the middle port Q' to the exhaust passage.
The slide proper R has behind it a reversing back S and is formed with four
independent ports R³, R³, R³, R, two at each side of an intermediate exhaust
cavity R (Fig 8). The two ports in the slide at each side of the exhaust cavity
are so situated that as the slide is reciprocated one port of each two serves to admit
actuating fluid to the corresponding port in the cylinder face, whilst one port of the
other two serves for exhaust, and vice versû, according to the direction in which the
engine is going. The reversing back S of the slide. R is provided with two
passages V V for admission of actuating fluid (say steam) from the valve jacket.
Also it contains a chamber into which there are passages S S S for admission of
exhaust, and a passage S' (Fig 8) for escape of the exhaust fluid (steam) to the
xhaust passage of the cylinder.
Referring to Fig 5, it will be seen the order of the ports, commencing at the left,
s as follows,
An exhaust pork Sta abam-
17

page_text: be moved to the right steam will be admitted to the port Q of the cylinder by the
port R, and the exhaust will flow from the port Q of the cylinder through the
port Rs. But if tho back be shifted to the left so that S' coincides with R', and V
with R², then if the slide bo moved to the right as before, the steam will now pass
from V' through R³ into the port Q², and the reverse action will obtain to that just
previously described.
The reversing back can be operated by any suitable device The arrangement
shewn comprises a spindle W with crank W', whose pin W takes into a slot X'
on an arm X fast on a spindle Y at whose lower end is a combined moving and
'locking device Z which when the spindle Y is turned acts upon one or other of the
curved sides of a recess in the slide thereby moving the back from one extreme
position (in which it is shewn) to the opposite extreme position, and locking it in
cach case in the position to which it has been so moved. In either extreme
position of the back the slot X' in arm X is parallel with the line of travel of the
slide and back, so that their movement is not influenced by the crank pin W³.
In Fig 5 the slide is at mid stroke. The position of the back is such that R'
forms the steam inlet to port Q-R2 forms the exhaust passage from Q-R forms
the steam passage to port Q, and R³ the exhaust passage therefrom.
If now it be desired to reverse, the back is caused to move along the slide into
such a relative position that R¹ forms the exhaust passage to Q, R³ the steam
passage to Q, R³ the steam passage to Q³, and R' exhaust passage therefrom.
It will be evident that reversing apparatus according to our invention as above
described may be used in engines differing in construction and arrangement from
that to which we have shewn it applied.

page_text: We JAMES JOHN MILLER, and GERALD JOHN TUPP, both of Creek Works,
Hammersmith, in the County of Middlesex, Engineers and Boat Builders, do
hereby declare the nature of our invention for "IMPROVEMENTS IN SLIDE VALVES
OR MEANS FOR DISTRIBUTING ACTUATING FLUID IN ENGINES "
5 the same is to be performed, to be particularly described and ascertained in and by
and in what manner
the following statement:—
In the specification of our application for Letters Patent No 2158 bearing date
25 January 1884 is described an improved construction of engine together with
arrangements for admission and emission of actuating fluid thereto and therefrom,
and the present invention is applicable to such engines.
In the accompanying sheet of drawings Fig 1 is a longitudinal section through
the steam chest and cylinder of an engine according to our invention,--Fig 2 is a
side elevation of the same, Fig 3 is a plan partly in horizontal section,-and Fig 4
is a transverse section of the engine.
According to this invention where it is desired to be able to reverse whilst the
engine is running we use an improved arrangemont according to which a slide is
provided with a back adjustable in relation to the slide so that by shifting the said
back longitudinally the actuating fluid passing through the ports may be reversed.
In this arrangement there is a cylinder face with ports QQQ the two outside
ports QQ leading to the respective ends of the cylinder and the middle port Q¹ to
the exhaust passage.
The slide proper R has behind it a reversing back S and is formed with four
independent ports R' R³ R³ R*, two at each side of an intermediate exhaust cavity R³
(Fig 1). The two ports in the slide at each side of the exhaust cavity are so
situated that as the slide is reciprocated one port of each two serves to admit
actuating fluid to the corresponding port in the cylinder face, whilst one port of
the other two serves for exhaust, and vice versa, according to the direction in which
the engine is going. The reversing back S of the slido R is provided with two
passages VV for admission of actuating fluid (say steam) from the valve jacket.
Also it contains a chamber into which there are passages S S S for admission of
exhaust, and a passage S' (Fig 1) for escape of the exhaust fluid (steam) to the
exhaust passage of the cylinder.
Referring to Fig. 1, it will be seen the order of the ports, commencing at the loft,
is as follows:-
An exhaust port St, a steam port V, and exhaust port S, a steam port V¹, and
in exhaust port S³. In the position indicated the back is so set that if the slide bo
noved to the right steam will bo admitted to the port Q of the cylinder by the
ort R', and the exhaust will flow from the port Q of the cylinder through the
ort R³. But if the back be shifted to the left so that S coincides with R' and V
vith R', then if the slide be moved to the right as before, the steam will now pass
rom V through R³ into the port Q3 and the reverse action will obtain to that just
reviously described.
The reversing back can be operated by any suitable device. The arrangement
hewn comprises a spindle W, with crank W, whose pip W takes into a slot X' on
a arm X fast on a spindle Y at whose lower end is a combined moving and locking
evice Z which when the spindle Y is turned acts upon one or other of the curved
dos of a recess in the slide thereby moving the back from one extreme position
n which it is shown) to the opposite extreme position, and locking it in each case

page_text: in the position to which it has been so moved. In either extreme position of the
back the slot X¹ in arm X is parallel with the line of travel of the slide and back
so that their movement is not influenced by the crank pin W
In Fig. 1, the slide is at mid stroke. The position of the back is such that R¹
forms the steam inlet to port Q, R' forms the exhaust passage from Q, R' forms
the steam passage to port Q and R' the exhaust passage therefrom. If now it be
desired to reverse, the back is caused to move along the slide into such a relativo
position that R1 forms the exhaust passage to Q, R² the steam passage to Q, R³ the
steam passage to Q, and R' exhaust passage therefrom.
It will be evident that reversing apparatus according to our invention as above
described may be used in engines differing in construction and arrangement from
that to which we have shewn it applied.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, wo declare that what
we claim is:-
1. The combination of a slide and a back adjustable in relation to such slide, the
arrangement being such that by shifting the said back longitudinally fluid passing
through ports may be reversed, substantially as hereinabove described.
2. The combination of parts herein above described with reference to and illus-
trated in the drawings for distributing actuating fluid in engines.
Dated this 24th day or October 100
W. LLOYD WISE,
Per F. J. Brougham,
Applicants' Agent.