Year: 1898

page_text: I, HERBERT OSBALDESTON DUNCAN, of 7, Rue du Mont Dore, l'aris, in the
Republic of France, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to improvements in or relating to electric motors
or steering-propeller motons, especially applicable to pleasure boats, but also
capable of being used for other vessels.
The rudder or steering propeller comprises a dynamo which is driven by the
current from accumulators or primary batteries arranged in any suitable part of
the boat, the spindle of the dynamo carrying a pulley at its outer end. The
dynamo is preferably mounted on four columns or supports in such manner that
it is possible to raise or lower said columns or the dynamo carried on them as
desired by means of a screw passing through a frame or base to which the four
columns are secured or in other suitable manner.
This frame is secured to the upper part of two substantially vertical tubes or it
may be a single tube which may be rectangular, cylindrical or of any other
desired shape and which terminate at the bottom in a water-tight casing in which
is arranged the shaft of a screw propeller a vertical sheet metal plate the use of
which will be hereinafter explained being secured to the casing.
This propeller shaft on which is keyed a pulley passes through a stuffing box
and is preferably mounted at the end opposite the propeller in ball bearings, say,
its point being mounted on balls arranged in a cup or casing. These balls receive
the pressure or thrust exercised by the screw propeller during the forward move-
ment.
The casing is divided into preferably two parts to facilitate fitting up, and
the front part is provided with an eye engaging with a pin secured to the back
of the keel of the vessel.' On the other hand the tube or tubes which are joined
in a water-tight manner to the casing are provided with adjustable sockets, and
are connected to a bracket the depending pin of which engages with a lug or
socket secured to the back of the vessel.
Finally to the frame or base of the dynamo is secured a bar terminating in a

page_text: handle and covered by a tube through which pass wires connecting the terminals
of the dynamo to fixed contacts near the inner end of the handle.
'
It will be understood from the preceding description that all the apparatus
which the helmsman operates by means of the handle can turn on pivots situated
on the back of the boat so that the screw propeller can not only be in the central
axis of the vessel but can also occupy different angles to the right and left of said
axis.
The pulley of the dynamo is connected to the pulley of the screw-propeller by
a belt or equivalent so that when the dynamo receives the current from the source
of electricity (which is effected by turning or rotating the handle in order to
make the necessary electrical connection an index being provided for this purpose
on the tube), the pulley at once actuates the screw-propeller.
To change the direction of travel the handle is moved to one side or the other
like an ordinary tiller, so that the shaft of the screw-propeller changes its position
in the horizontal plane whereby as will be easily understood the direction of
travel of the vessel is changed.
To go astern, it is sufficient to turn or rotate the handle in order to change the
contacts whereby the direction of rotation of the screw propeller will be changed.
To stop, the circuit is interrupted by suitably turning the handle.
In cases when it is desired to change the direction of travel after the dynamo has
been stopped and during the time that the boat still moves owing to the speed
acquired, the helm is manipulated as usual, the sheet-metal on the propeller shaft
casing fulfilling the part of a rudder.
The belt may be without inconvenience replaced by a cord made of gut or by a
chain. Then the pulleys will be provided with grooves or teeth. The tension of
the belt or its equivalent is effected by means of the screw in the base of the
dynamo, whereby, the dynamo may be raised as desired on its supporting columns.
The apparatus may be adapted for boats of various sizes by adjusting the sup-
porting sockets vertically on the tube or tubes and lengthening or shortening the
connecting bracket.
This rudder propeller can be removed with the greatest ease when it is not
required for use.
From the preceding it will be understood that none of the moving parts except
of course the screw-propeller can be reached or affected by water owing to the
closed casing of the propeller shaft and the vertical tubes the whole of which
constitutes a water-tight casing.
Dated this 22nd day of February 1898.
BOULT & WADE,
Agents for the Applicant.
Improvements in or relating to Electric Motors.
I, HERBERT OSBALDESTON DUNCAN, of 7, Rue du Mont Dore, Paris, in the
Republic of France, 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:-
The present invention relates to improvements in or relating to electric motors
or steering-propeller motors, especially applicable to pleasure boats, but also
capable of being used for other vessels.
In order that the nature of the invention may be better understood, the
accompanying drawings show an example of the application of the invention.

page_text: Fig. 1 shows a perspective view of the apparatus mounted, by way of example,
at the back of the boat.
Fig. 2 is a longitudinal vertical section through the centre of the apparatus.
The rudder or steering-propeller comprises a dynamo D which is driven by
the current from accumulators or primary batteries arranged in any suitable part
of the boat, the spindle of the dynamo carrying a pulley A at its outer end. The
dynamo is preferably mounted on four columns or supports dddd in such
manner that it is possible to raise or lower said columns or the dynamo carried
on them as desired, by means of a screw V passing through a frame or base B
to which the four columns are secured or in any other suitable manner.
This frame B is secured to the upper part of two substantially vertical tubes T T¹
or it may be a single tube-which may be rectangular, cylindrical or of any
other desired shape, and which terminate at the bottom in a water-tight casing U
in which is arranged the shaft F of a screw-propeller H, a vertical sheet-metal
plate M the use of which will be hereinafter explained, being secured to the
casing.
The propeller shaft, on which is keyed a pulley P, passes through a stuffing
box and is preferably mounted at the end opposite the propeller, in ball bearings,
say its point f being mounted on balls arranged in a cup or casing. These balls
receive the pressure or thrust exercised by the screw-propeller during the forward
movement.
The casing C is divided into preferably two parts to facilitate fitting up, and
the front part is provided with an eye c engaging with a pin G secured to the
back of the keel of the vessel. On the other hand, the tube or tubes T T which
are joined in a water-tight manner to the casing C, are provided with adjustable
sleeves or sockets II', connected to a bracket K the depending pin J of which
engages with a lug or socket L secured to the back of the vessel.
Finally, to the frame or base B of the dynamo is secured a bar Q terminating
in a handle R and covered by a tube N through which pass wires connecting the
terminals of the dynamo to fixed contacts near the inner end of the handle.
It will be understood from the preceding description that all the apparatus
which the helmsman operates by means of the handle R, can turn on pivots
situated on the back of the boat, so that the screw-propeller can not only lie in
the central axis of the vessel, but can also occupy different angles to the right
and left of said axis.
As can be seen from the drawing, the pulley A of the dynamo is connected to
the pulley P of the screw-propeller by a belt S or equivalent so that when the
dynamo receives the current from the source of electricity (which is effected
by turning or rotating the handle R in order to make the necessary electrical con-
nection an index being provided for this purpose on the tube N.) the pulley A
at once actuates the screw-propeller H.
To change the direction of travel, the handle R is moved to one side or the
other, like an ordinary tiller, so that the shaft of the screw-propeller changes its
position in the in the horizontal plane, whereby, as will be easily understood, the
direction of travel of the vessel is changed.
To go astern, it is sufficient to turn or rotate, the handle R in order to change
the contacts, whereby the direction of rotation of the screw-propeller will be
changed. To stop, the circuit is interrupted by suitably turning the handle R.
In cases when it is desired to change the direction of travel after the dynamo
has been stopped and during the time that the boat still moves owing to the speed
acquired, the helm is manipulated as usual, the sheet-metal plate M on the pro-
peller shaft casing fulfilling the part of a rudder.
The belt S may be without inconvenience replaced by a cord made of gut or by
a chain. Then the pulleys A and P will be provided with grooves or teeth. The
tension of the belt or its equivalent is effected by means of the screw V in the
base of the dynamo, whereby the dynamo may be raised, as desired, on its sup-
ting columns d d¹ di d

page_text: The apparatus may be adapted for boats of various sizes by adjusting the sup-
porting sockets I I¹ vertically on the tube or tubes TT and lengthening cr
shortening the connecting bracket K.
This rudder-propeller can be removed with the greatest ease when it is not
required for use.
From the preceding it will be understood that none of the moving parts, except,
of course, the screw propeller, can be reached or affected by water, owing to the
closed casing C of the propeller shaft and the vertical tubes TTi the whole of
which constitutes a water-tight casing.
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. A detachable electric rudder-propeller, comprising a propeller and its shaft
and a belt cord or chain driving gear enclosed in a water tight casing, in com-
bination with a dynamo adjustably mounted so as to enable the tension of the
driving band to be regulated, and an operating handle adapted to revolve round
its own axis and serving not only for operating the steering bar, but also for
effecting the necessary connections to produce a forward or back-motion of the
propeller or its stoppage by means of suitable contacts.
2. The combination and arrangement of parts constituting the complete electric
motor for vessels substantially as described or illustrated in the accompanying
drawings.
Dated this 15th day of November 1898
BOULT & WADE,
Agents for the Applicant.