Year: 1898

page_text: We, THOMAS SMITH, WILLIAM HILL SMITH and WILLIAM EASTWOOD, trading as
Smith Bros. & Eastwood, of Valley Iron Works, Valley Road, Bradford, in the
County of York, Engineers and Millwrights, do hereby declare the nature of this
invention to be as follows:-
Our invention has reference to the arrangement of the "Corliss" or semi-rotary
valves of steam engines of that class which differs from the original Corliss type
in having no detent or trip gear, and also to the manner of actuating the valves.
Our object is to effect the same distribution of steam, or practically the same,
as is attained with the best forms of Corliss gear with trip arrangement
We
For this purpose we employ either 5 or 6 valves in one cylinder according to the
size of the engine Two are for exhaust, two for admission, and one in some cases
or two in others for cut-off. We prefer to actuate the two admission and the two
exhaust valves by one central wrist plate, and the two cut-off valves by a separate
wrist plate driven by the rotary eccentric of a crank-shaft governor. In the
case where we have only one out-off valve we have no central wrist plate
may also work the admission and exhaust valves by separate eccentrics with or
without wrist plate We may also control the cut-off valves by means of a governor
of the ordinary vertical type with suitable means of coupling up such as sleeve
and scroll, or three bevil wheels. We may also use this arrangement of valves
with a stationary eccentric without any governor, or with an eccentric which may
be mounted on the crank-shaft or on a secondary shaff in such a manner as to
allow of its being partially rotated round the shaft by hand We may also mount
the whole orank-shaft governor on crank-shaft or secondary shaft in such a manner
as to allow of its being partially rotated by hand
THOMAS SMITH.
W. HILL SMITH
WILLIAM EASTWOOD,
We, THOMAS SMITH, WILLIAM HILL SMITH and WILLIAM EASTWOOD, trading as
Smith Bros & Eastwood, of Valley Iron Works, Valley Road, Bradford, in the
County of York, Engineers and Millwrights, 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:-
-
Our invention has reference to the arrangement of the " 'Corliss" or semi-

page_text: 1otary valves of engines of that class which differ from the original Corliss type
of valve in having no detent or trip gear, and also to the manner of actuating
the valves.
>
The object of our improvement 18 to effect the same distribution of steam, or
practically the same, as is attained with the best forms of Corliss gear with trip
arrangement
For this purpose we employ either 5 or 6 valves in one cylinder according to
the size of the engine. Two are for exhaust, two for admission, and one in some
cases or two in others for cut off.
Figs. 1, 2, 3, shew the arrangement of the valves.
A A are the exhaust valves like those commonly used. -
BB are the admission valves
CC are the cut off valves.
FG II are the links or connecting rods actuating these valves respectively
F and G in this case are coupled to the wrist plate D which derives its motion
by means of an eccentric rod from eccentric on fly wheel shaft.
His the connecting link connecting the cut-off valve C with the wrist plate E,
which has a constant stroke as regards length, but the time of making the stroke
may be varied
The manner of varying the stroke is not shewn
The stroke may
be derived from an eccentric free to rotate on the fly wheel shaft and rotated
relatively thereto by connecting links of a crank shaft governor
Or motion may
be derived from a cam driven with gearing from the fly wheel shaft with an
allangement of differential bevil wheels in train in such a manner that by
means of a governor of the vertical type the centre one can be raised or lowered
causing the duven wheel to which the cam is attached to rotate forward or back-
ward relatively to the crank shaft Or the stroke may be derived from a cam
diven with gearing from fly wheel shaft in such a manner that by means of a
sleeve and scroll coupled to a governor of the vertical type the cam is notated
for ward or backward by the rise or fall of the governor weights The motion or
stroke may be derived from a fixed eccentric, in which case the time of cut off
will only be varied by readjusting the position of the eccentric in relation to the
ciank, or by making the links Hadjustable in length.
We would observe that we make no claim for the manner of actuating the
valves, which may be either with wrist plate or otherwise, but only for the arrange-
ment of the valves, either 6 valves as shewn, 2 for exhaust, 2 for admission, and 2
for cut off. or 5 valves, i.e., with only one cut off valve, the arrangement of which
we have not thought it necessary to shew, in this case the two valves C C are
eplaced by one valve, having a port on each side, one port leading to one end of
the cylinder and the other port leading to the other end as will be obvious to
engineers
Although we have referred to our improvements as applicable to steam engine*,
the arrangement of valves can with equal advantage be applied to compressed air
engines
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is..
In a steam engine or compressed air motor the arrangement of 6 or 5 valves as
and for the purpose set forth.
WILLIAM EASTWOOD.
THOMAS SMITH
W HILL SMITH.