Improvements in Slide Valve Appliances for Steam Ships' Steam Steering Engines.
Year: 1886

page_text: Improvements in Slide Valve Appliances for Steam Ships'
Steam Steering Engines.
EDWARD ADAMS SLADE 18 Challoner Grove, South Shields, in the County of
Durham, Marine Engineer do hereby declare the nature of this invention to be as
follows:-
These my improvements in slide valve appliances are applicable to geared
steering engines, & this my invention consists in a slide valve having threa
through ports-deriving its motion from an eccentric fixed to crank shaft in direct
line with crank only opening & closing by combined action with a common slide
valve working on back of the three ported slide valve-the said common slide
valve to be actuated from eccentrics placed loose on the crank shaft which in turn
receive their motion from connection to the helm wheel.
Slide Valve Appliances constructed according to this my invention possess the
following advantages.
Economy in steam used-simplicity in action & construction-reduction in wear
& tear-non liability to derangement.
:

page_text: Steam Steering Engines.
EDWARD ADAMS SLADE, of 18 Challoner Grove South Shields in the County of
Durham, Marine Engineer do hereby declare the nature of my invention for
IMPROVEMENTS IN SLIDE VALVE APPLIANCES IN STEAM SHIPS STEAM STEERING
ENGINES and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
These my improvements in slide valve appliances are applicable to geared
steering engines & this my invention consists in a slide valve having three ports-
deriving its motion from an eccentric fixed in line with crank & only closing by
combined action with a common slide valve-working on back of three ported
slide valve the said common slide valve actuated from eccentrics placed loose on
the crank shaft-which in turn receive their motion from connection to the
helm wheel.
The drawings herewith shew valve appliance for cyls. of 7 in. dia.
A represents cylinder face-the distance between the ports being sufficient to
allow the inner face of the three ported slide valve to travel against the cylinder
face without closing the ports in the cylinder face by contact with the inner face
of the three ported slide valve-thus permitting admission of steam whenever the
common slide valve has been moved in required direction, aganst the back or
outer face of the three ported slide valve.
B represents the back or outer face of the three ported slide valve in which the
ports are of ordinary dimensions-and by the movement of the engine after steam
has been admitted-the three ported slide valve follows in the same direction in
which the common slide valve has been moved-and thus the cut off is performed
in strict accordance with the manipulation of the steering wheel either at minute
portions of the stroke of piston or in following up a succession of regular strokes
when such may be required.
C represents the inner face of the three ported slide valve-which face works
next to the cylinder face-without causing the ports to close by contact with the
said cylinder face.
D represents the face of a common slide valve-or in this form of appliance the
actuating valve-and this actuating valve has the same length of travel as the
three ported slide valve-upon the back of which it performs its work-deriving
its motion from movement of the loose eccentrics and steering wheel's connections,
when those are moved as required, by the helmsman.
E represents a face of loose eccentric and chain pulley (allowing chain to be the
form of connection in this explanation although other means may be used to
convey the motion) and in Fig. E a stopper is represented-which stopper 8 has to
work in the slot shewn in the fixed eccentric-and the purpose of this stopper 8
is to prevent derangement being caused by any person moving the steering wheel
when steam is shut off at the stop valve-or when steering engine be not in use.
Fig. F represents the face of fixed eccentric which imparts the action of "cutting
off steam
or closing ports-but not an alternate opening. The radial slot r
shewn in this eccentric, receives the stopper 8 of loose eccentric-these parts
being of different principle to those in the common form of loose eccentric which

page_text: has to be driven round by resting against the stopper. Each engine should be
fitted with a spring reducing valve in the steam pipe.
In many steering engines a complication of tooth wheels or worm gearing are
used to impart admission or cut off-the slack & back lash commonly causing
defective action of slide valves.
No complicated gearing is needed to impart movement to my slide valve
appliance the even & silent action of eccentrics will produce equally smooth and
even action with the slide valves.
G represents a chain sheave or "gipsy wheel" to be fixed on a shaft that has
also a small steering wheel upon it with screw-traversing nut-& stoppers
such as are in common use without restriction-or-when this part of steering
gear be placed on an upper bridge that will allow sufficient length of endless chain
so to be used-a cheaper stopper than the former can be reliably applied by fixing
a stopper in one of the links of chain-and also fixing a fork for chain to travel in
-so that the stopper on the link would be stopped against the fork when sufficient
had been given in movement of the machinery & gear-to put the rudder "hard
aport" or "hard a starboard."
e, e, e, represents, a view of chain pulley-chain sheave-or "gipsy" wheel with
an eccentric cast on each side or each face of it-or otherwise fixed to it-to be
moved by the movement imparted to said chain pulley--as before described in
reference to E-which represents a face of same.
f represents a view of eccentric sheave to be fixed on crank shaft in line
with crank the line of "throw" is in this view represented to be directly in
line with sight-eccentricity not shewn.
within dotted lines represents key way.
E, S, D, represents an explanatory sectional diagram-with details marked as
follows-
a and a, each represents a cylinder face-with ports as described in A-or shewn
in fig. A.
b
C
b
and represent three ported slide valves-with ports as shewn in figures B
and C.
с
d and d represent common slide valves as used for actuating valves in this
-with exhaust port or passage as shewn in fig. D. spring = 2.
case-
ei, ei, ei, represent a chain pulley and an eccentric on each side or each face of
chain pulley-cast together with it or otherwise fixed to it-the chain pulley &
eccentrics with it being placed loose upon the crank shaft as in fig. e e e.
ff and ff, represent eccentrics fixed on the crank shaft in line with the cranks.
The parts for which I claim novelty are not confined or restricted to using or
use of chain connection-& I recommend for some vessels that a bevel wheel or
tooth wheel be cast with-or fixed to-the loose eccentrics-and ordinary form of
wheels & shafting used instead of chain pulleys & endless chain.
Having now particularly described & ascertained the nature of my said
invention, & in what manner the same is to be performed-I declare that
what I claim is-
1. The application of the three ported slide valve as herein or before described
by my specifications.
2. The application of an eccentric fixed in line with the crank as herein or
before described in my specifications.
Dated this 20th day of November 1886.
EDW ADAMS SLADE.