Improved Means and Apparatus for Controlling Propellers.
Year: 1897

page_text: Date of Application, 4th Dec., 1897
Complete Specification Left, 2nd Sept., 1898-Accepted, 15th Oct.,
1898
PROVISIONAL SPECIFICATION.
Improved Means and Apparatus for Controlling Propellers.
I, JOHN BURGUM, Engineer, of 43, Rua de Rozario, Rio de Janeiro, Brazil, do
hereby declare the nature of this invention to be as follows:
In my propeller controller as I prefer to arrange it, I employ
a long narrow pressure plate A which is placed at the back of propeller B
extending from top to bottom of same, at the bottom end it is secured by a hinged
joint Callowing the pressure plate A to oscillate, at the top end of pressure
plate is connected a rod D) passing through the stern frame E which has a
stuffing box F to prevent water passing into vessel, the rod D extends to a
lever Ġ which has at its centre a fixed pin to allow the lever to oscillate upon,
this lever transmits its power to the rod H which has a spiral spring I adjusted
by a set nut U to counteract the pressure plate A, at the end of roll H is
connected lever J which has at its centre a pin to allow the lever to oscillate,
this is fixed by an adjustable screw K which goes through a fixed bracket L and
has on the end two nuts M to set lever J in position, at the top end of lever is
connected a piston shaft N which is secured to a piston valve O which moves
in cylinder P having round its circumference steam ports Q to admit the steam
from chamber R to supply engine as required to maintain a uniform speed.
By the use of my pressure plate at the back of propeller I obtain a pressure
on same due to resistance according to the velocity of ship, and as the pressure
plate is released from the water together with the propeller its surface in contact
with the water is reduced in proportion, thus the spiral spring I forces the rod H
in the direction of arrow S which in its turn pulls the lever J thus doing moves
the piston rod N inwardly closing off the steam ports Q, therefore the steam
admitted to the cylinder is regulated in accordance with the propeller leaving
the water maintaining a uniform speed. The piston is adjusted by the screw
nut U to suit the speed of ship. When in calm weather the controller is not in
use the valve O is pulled out of its position by the hand wheel T leaving a free
passage for the steam, the action of pressure plate A can be transmitted to the
throttle valve by any liquid or compressed air which may be preferable or con-
nected direct from pressure plate to a throttle valve.
Dated this 4th day of December 1897
Improved Means and Apparatus for Controlling Propellers.
I, JOHN BURGUM, Engineer, of 43, Rua de Rozario, Rio de Janeiro, Brazil, do
hereby declare the nature of this invention and in what manner the same is to
[Price 8d.]

page_text: be performed to be particularly described and ascertained in and by the following
statement:
In
I prefer to
it
as
my propeller controller
as
arrange it, and
is shown in the drawings left with the Provisional Specification, I
employ a long narrow pressure plate A, which is placed at the back of propeller B,
extending from top to bottom of same, at the bottom end it is secured by a hinged
joint C, allowing the pressure plate A to oscillate, at the top end of pressure
plate is connected a rod D, passing through the stern frame E, which has a
stuffing box F to prevent water passing into vessel. The rod D, extends to a
lever G, which has at its centre a fixed pin to allow the lever to oscillate upon,
this lever transmits its power to the rod H, which has a spiral spring I, adjusted
by a set nut U, to counteract the pressure plate A. At the end of rod H is
connected lever J, which has at its centre a pin to allow the lever to oscillate,"
this is fixed by an adjustable screw K, which goes through a fixed bracket L, and
has on the end two nuts M to set lever J in position. At the top end of lever is
connected a piston shaft N, which is secured to a piston valve 0, which moves
in cylinder P, having round its circumference steam ports Q, to admit the steam
from chamber R to supply engine as required, to maintain a uniform speed.
By the use of my pressure plate at the back of propeller, I obtain a pressure
on same due to resistance according to the velocity of ship, and as the pressure
plate is released from the water together with the propeller, its surface in contact
with the water is reduced in proportion, thus the spiral spring I forces the rod H
in the direction of arrow S, which in its turn pulls the lever J, thus doing moves
the piston rod N inwardly closing off the steam ports Q, therefore the steam
admitted to the cylinder is regulated in accordance with the propeller leaving
the water, maintaining a uniform speed. The piston O is adjusted by the screw
nut to suit the speed of ship. When in calm weather the controller is not in
use, the valve is pulled out of its position by the hand wheel T leaving a free
passage for the steam. The action of pressure plate A can be transmitted to the
throttle valve by any liquid or compressed air which may be preferable, or con-
nected direct from pressure plate to a throttle valve.
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:
1. Controlling a propeller by means of an immersed pressure plate, such as A,
actuating a throttle valve, which governs the admission of steam to the engines
driving the propeller.
2. Controlling a propeller by mechanism substantially as herein described.
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