(57) Hydraulic control arrangements for operation from the bridge of a ship are disclosed.
In each example, a cam (19) can be displaced linearly by a cable (20) from the bridge
to control a valve (9) via a lever (21) having a cam-following roller (22) which co-operates
with the camming surface (23) of the cam (19). In response to displacement of the
cam (19), the valve (9) causes oil to be fed to a cylinder (6) so that the latter
is displaced, thereby displacing a carriage (2) until the lever (21) adopts a position
with its roller (22) approximately mid-way along the camming surface (23), whereupon
the valve (9) stops the flow of oil and the carriage (2) stops. In one example, a
cam (34) is carried by the carriage (2) for displacing a lever (35) as a result of
movement of the carriage (2), the lever (35) being connected to control the speed
of an engine of the ship via a cable (38); and another lever (25) carried by the carriage
(2) is connected to the pitch setting mechanism of a controllable pitch propeller
via a cable (30) for altering the pitch of a controllable pitch propeller of the ship
as a result of displacement of the carriage (2). In another example, instead of the
other lever (25) for controlling the setting of a controllable pitch propeller, there
is another lever (41) pivotally mounted and displaced as a result of movement of the
carriage (2) by cams (39 and 40) carried by the carriage (2), the other lever (41)
being connected to control a reversible gearbox for the engine via a cable (49). In
each example, the carriage moves at a given speed lower than that of displacement
of the cam (19) irrespective of the speed of the displacement of the cam if the latter
is greater than the given speed.
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