Year: 1886

page_text: Date of Application, 14th Aug., 1886
Complete Left, 4th Apr., 1887.
Complete Accepted, 6th May, 1887.
WALTER HENRY WILSON and WILLIAM JAMES PIRRIE both of Queen's Island,
Belfast, in the County of Antrim, Shipbuilders do hereby declare the nature of this
invention to be as follows :-
Our said invention has for its object, to render ships' rudders of the single plate
form more easily constructed, more durable, and more easily repaired and to provide
in an improved and advantageous manner for the securing of the plate to the
frame.
The frame may be of wrought iron or cast steel constructed with a number of palms
cast or forged in one piece with the rudder stock. These palms project at right
angles from the after part of the stock and have their faces arranged parallel to the
main plane of the structure.
Instead of arranging the palms in pairs opposite to each other and placing the
plate between them and riveting it through both, we construct the frame so that the
palms are alternately on opposite sides of the slate to which each palm is riveted
separately.
Rudder frames constructed as described can be more easily cast or forged and flaws
are less liable to occur in them than in frames of the ordinary kind.
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1002

page_text: We, WALTER HENRY WILSON and WILLIAM JAMES PIRRIE, both of Queens Island
Belfast, in the County of Antrim, Shipbuilders 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 said invention has for its object, to render ships' rudders of the single plate
form, more easily constructed, more durable, and more easily repaired, and to
provide in an improved and advantageous manner for the securing of the plato to the
frame.
The frame may be of wrought iron or cast steel constructed with a number of palms
cast or forged in one piece with the rudder stock. These palms project at right angles
from the after part of the stock and have their faces arranged parallel to the main
plane of the structure.
Instead of arranging the palms in pairs opposite to each other and placing the plate
between them and riveting it through both, we construct the frame so that the
palms are alternately on opposite sides of the plate to which each palm is riveted
separately.
Rudder frames constructed as described can be more easily cast or forged and flaws
are less liable to.occur in them than in frames of the ordinary kind.
By reference to the accompanying drawing this invention will be more clearly
understood.
Fig. 1 is a side elevation of the rudder.
Fig. 2 is a section at the vertical line A B.
Fig. 3 is a section at the horizontal line C D.
Fig. 4 is a section at the horizontal line X Y.
Fig. 5 is a section at the horizontal line E F.
i is the rudder stock from which the palms g project and are arranged so as to be
alternately on opposite sides of the plate has shown on Fig. 2. The plate / is fitted
into the slot k and is riveted to the palms g as shown on Figures 3, 4 & 5.
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 :
1-The construction of single plate rudders having palms which project from the
stock and to which the plate is secured, arranged so as to be alternately on opposite
sides of the said plate substantially as herein before described and represented on the
accompanying drawing.
2-The use of rudders so constructed.
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