CONTROLLING MARINE ENGINES WHEN STEAMING AGAINST STRONG HEAD WIND AND SEA
Year: 1885

page_text: I JOHN PHILIP RAWLINGS Engineer 34 Commercial Street Leith Edinburgh N.B
do hereby declare the nature of my invention for CONTROLLING MARINE ENGINES
WHEN STEAMING AGAINST STRONG HEAD WIND AND SEA, to be as follows:-
I first make a suitable frame composed of four castings with holes in the ends to
receive coller studs by which the frame is held together. At the bottom of this
frame a carriage is fitted and allowed to work freely on its centre, two steel bars is
fitted and on which a metal grooved roler is made to travel, on the top of the
frame two brackets is fitted that carries a spindle with two rods suspended, the
bottom ends is made with slot holes that work on centres of the roler. A lever is
fitted on the spindle and is connected to the slide valve of a steam cylinder made
with double end piston rod. A brake is made to act on any suitable disc on the
propeller shaft, and receives its motion from the steam cylinder, the throttle valve
also receives its motion in connection with the steam cylinder, the action being as
follows, the carriage on which the roler travels is adjusted to suit the trim of the
ship, and the instant the stern of the ship attempts to rise out of the water the
roler runs forward gives motion to the steam cylinder, the power is applied to
the brake, and the throttle valve is closed or regulated to the required position, on
the ships stern again entering the water the roler runs back opens the throttle
valve and releives the brake.
I

page_text: I, JOHN PHILIP RAWLINGS Engineer 34 Commercial Street Leith Edinburgh N B
'do hereby declare the nature of my invention for THE PREVENTION OF MARINE
ENGINES RACING WHEN STEAMING AGAINST HEAD WIND AND SEA and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
"
I first make two metal frames A A with a collar stud B passing through the
lower part, and mount them on a base plate C A carriage D is made and fitted to
work on this said collar stud B between the frames A A and on each side of this
carriage D two steel bars or rails E E is fitted parallel to each other and on those
bars or rails E E a roller F with grooves turned is made to travel, the upper part
of these frames A A are made to receive a spindle M fitted with two side rods G G
suspended, the bottom ends are made with slot holes, that fit loose on the ends of
roller F shaft. A steam cylinder H is fitted between the frames A. A with double
piston rods J J and circular slide valve K this valve is worked from a lever L fitted
to the spindle M on the upper part of the frame A A the connection between the one
end of the piston rod J and throttle valve, is made in the usual way the other is
connected with rod and bell crank levers, that applies power to a brake this brake
is made, to act on a suitable pulley or the coupling of the main shaft and the strap
of this said brake is made and fitted to work by a vertical shaft, having double
right and left handed screws, the shaft being secured to the Engine room bulkhead
by brackets The action being as follows The carriage D on which the roller F
travels is adjusted to suit the trim of the ship and secured in that position Steam
is then turned on, and the instant the stern of the ship lifts with the sea the
roller F runs forward and opens the slide valve K of steam cylinder H the power
is then applied to the brake and the throttle valve is regulated to any suitable
position. On the stern of the ship plunging in the water the roller F runs back,
the brake is at once released and the throttle valve opened to steam, and by the
vacuum to the condenser being maintained the Engines immediately get freely
away. On the stern of the ship again lifting the Engines are held in check before
racing can take place.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
1st The means by which the action is given to the roller F in applying power to
the brake. In addition to closing, opening or regulating the throttle, in place of
the old method of the governor being worked off the main shaft by a rope.
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