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1. (WO1980000948) MOYENS DE DIRECTION ET DE PROPULSION DE BATEAUX ET PROCEDE D"INSTALLATION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

STEERING AND PROPULSION MEANS IN
VESSELS AND METHOD OF INSTALLING

SAME

This invention relates to steering and propulsion means in ships or other vessels and to a method of
installing same.
Steering and propulsion means for ships and other vessels are known which are mountable in the bottom of a vessel and which are adapted to pump a fluid, usually water, under pressure through an outlet in the bottom of the vessel, the outlet comprising deflector means adapted to discharge the fluid under pressure as a stream or jet which will provide thrust having a substantially horizontal component, the deflector means being rotatable through 360° about a vertical axis so that said stream or jet can be directed as required to provide both propulsion and steering. Such a steering and propulsion means will hereinafter be referred to as "a steering and propulsion means of the kind described".
In British Patent Specification No. 1,213,981 there is disclosed steering and propulsion means of the kind described comprising a hollow casing defining a passage substantially in the form of a shallow inverted "U" , one end of the passage communicating with an inlet opening in the bottom antl/or side of the vessel and the other end of the passage communicating with said outlet, suitable pump

5. means being mounted in said passage for drawing water in through said inlet opening and discharging it, under
pressure, through said outlet. Two shafts extend into
•said casing through suitable glands, said shafts being
offset from one another and passing one another within

10 said passage, one of said shafts being a drive shaft one end of which is connectable to said pump means and the
other end to a suitable prime mover and the other said
shaft being a steering shaft one end of which is connected to said deflector means and the other end of which is S connectable to suitable steering control means.
In British Patent Specification No. 1,362,694
there is disclosed a ship retarding system for assisting in the slowing down of large oil tankers and like vessels at sea and which at the same time is capable of assisting 0 manoeuvring of such vessels in port. The system comprises a steering and propulsion means of the kind described
having a casing defining a passage having a substantially horizontal portion containing pump means and connected to a forward facing inlet opening in the hull of the vessel 5 and a substantially vertical portion connected to said
outlet. Two offset shafts extend into said casing, one being a substantially horizontal shaft for driving the pump means and the other a substantially vertical shaft for rotating the deflector means.
A disadvantage with known steering and propulsion means of the kind described is the inherent lack of flexibility in the manner in which they can be installed in a vessel. Thus each known steering and propulsion means of the kind described is such that it can only be installed with the water inlet thereto either in the bottom of a vessel, in the bow or in the side of a
vessel or partially in the bottom and partially in the bow or side of a vessel and a steering and' propulsion means designed for one of these applications cannot be used for either of the other applications.
Another disadvantage with known steering and propulsion means of the kind described is that access to the pump bearings and other internal parts for
servicing can only be gained through the inlet or outlet end of the casing and for this reason the means has to be demountably installed in a vessel. This necessitates providing expensive machined seatings in the hull of the vessel to which the steering and propulsion means is demountably secured.
A further disadvantage with known steering and propulsion means of the kind described, and particularly those having a substantially inverted U-shaped casing such as that disclosed in the said British Patent
Specification No. 1,213,981, is that because of its
shape the casing is difficult to fabricate and accordingly generally comprises a relatively expensive casting.

The present invention has as its object to provide, in a vessel, steering and propulsion means of the kind described and a method of installing same which is' such as to provide a greater degree of flexibility in the manner in which' the steering and propulsion means can be installed in a vessel.
The; present invention also has as its object, according to a preferred embodiment thereof, to provide, in a vessel, steering and propulsion means of the kind described which is capable of being serviced from within the vessel without feeing demounted therefrom, which does not require expensive machined seatings, and the casing of which is capable of being fabricated.
The present invention provides a vessel having steering and propulsion means of the kind described, the vessel comprising a chamber which is watertight from the remainder of the interior of the vessel and a water inlet in the hull of the vessel which communicates with the interior of said chamber, and the steering and
propulsion means comprising a casing defining a passage having an inlet end in communication with the interior of said chamber and an outlet end connected to an outlet in the bottom of the vessel.
The invention also provides a method of installing steering and propulsion means of the kind described in a vessel, the method comprising providing in the vessel a chamber which is watertight from the remainder of the interior of the vessel, providing a water inlet in the hull of the vessel which communicates with the interior.
f OMF of said chamber, obtaining steering and propulsion means of the kind described comprising a casing defining a passage having an inlet end and an outlet end, connecting the inlet end of the casing to said chamber so that said passage is in communication with the interior thereof and connecting said outlet end to an outlet in the bottom of the vessel. '
The casing of the steering and propulsion means is preferably such as to define a passage having a substant-ially horizontal inlet portion, a substantially vertical outlet portion and an intermediate portion connecting the inlet portion to the outlet portion. Such a casing is of relatively simple shape and is accordingly suitable for fabrication. A pair of shafts may extend into said casing, one of said shafts being a substantially
horizontal drive shaft connecting pump means contained within the inlet portion of the passage to a suitable prime mover and the other a substantially vertical steering shaft connecting said rotatable deflector means to steering control means. Said shafts may be offset from one another and may pass one another within said passage.
Said chamber may be defined partially by the hull of the vessel and partially by partition walls connected to the hull of the vessel. Said partition walls may include a substantially vertical wall having an aperture therein and the inlet end of the casing of the steering and propulsion means may be secured to said vertical wall around said aperture so that the inlet portion of said passage is in communication with the interior of the chamber.
It will readily be appreciated that since said chamber can be installed as required in a vessel
according to whether the water inlet thereto is to be in the bottom of the vessel, in the bow or in the side of the vessel or partially in the bottom and partially in the bow or side of the vessel, a great deal of
flexibility is provided in the manner in which the steering and propulsion means can be installed.
According to a preferred embodiment of the present invention, said chamber is provided with a removable closure whereby access can be gained to the interior thereof and to the pump bearings and other internal parts of the steering and propulsion means. This not only enables servicing and routine maintenance to be carried out on the steering and propulsion means with the minimum disturbance and delay but also means that the steering and propulsion means need no longer be demountable. Accordingly the casing of 'the steering and propulsion means can be permanently secured, e.g. , welded,to said vertical wall of said chamber and to the bottom of the vessel around the outlet opening therein, thus eliminating the need for expensive machined
seatings in the hull of the vessel.
The invention will be more particularly described with reference to the accompanying diagrammatic

O PI
Λ. WIlFr-OU drawings, in which: - Fig. 1 is a fragmentary cross-sectional elevation of a vessel provided with steering and propulsion means, according to the present invention, only a small part of the bottom of the vessel being shown,
Fig» 2 is a fragmentary side elevation partly in section of an alternative embodiment of the present invention only a small part of the hull of the vessel again being shown, and
Fig. 3 is a view similar to Fig. 2 of yet a further embodiment of the present invention.
Referring to Fig. 1 it will be seen that a
rectangular box-like chamber 1 defined by opposed side walls 2 and 3, opposed end walls of which only one designated 4 is shown, by the bottom 5 of the vessel and by a removable top wall or cover 6 is provided within the vessel so as to be watertight from the remainder of the vessel. A water inlet 7 in the bottom 5 of the vessel communicates with the interior of the chamber 1. Also provided within the vessel is steering and propulsion means comprising a casing 8 defining a passage 9 having a substantially horizontal inlet portion 10, a substantially vertical outlet portion 11 and an intermediate connecting portion 12.
The inlet end of the casing 8 comprises a
separately formed portion 13 which projects through- an aperture in the wall 2 into the chamber 1 and contains pump means 14, the portion 13 having an outwardly directed flange 15 which is connected to a flange 16 of the adjacent portion of the casing'. The flange 16 is permanently secured, e.g., welded, to the wall 2 about said aperture therein. The outlet end of the casing 8 comprises an enlarged diameter portion 17 permanently secured, e.g., welded, to the bottom 5 of the vessel around an outlet opening therein. The enlarged diameter portion 17 of the casing houses deflector means 18 rotatable through 360 in either direction and adapted to direct water under pressure from the pump means 14 as a stream or jet which will 'provide thrust having a substantially horizontal
component.
Extending into the casing 8 is a substantially horizontal drive shaft 19 one end of which is connected to the pump means 14 and the other end of which is connectable to a suitable prime mover (not shown) and a substantially vertical steering shaft 20 one end of which is connected to the deflector means 18 and the other end of which is connectable to steering control means (not shown). The shafts 19 and 20 are offset from one another and pass one another within the
intermediate portion 12 of the passage 9. The drive shaft 19 can be designed to be driven by the prime mover through suitable belt drive means which will provide a required drive ratio without the use of a costly gearbox or like reduction mechanism.
The embodiment of Fig. 2, in which like parts have been given like reference numerals, is substantially the
ϊ
OMPI same as that of Fig. 1 except that the chamber 1 is partially defined by the side or bow 21 of the vessel, which replaces the side wall 3, and the water inlet 7 is provided in the side or bow 21.
The embodiment of Fig. 3, in which like parts have again been given like reference numerals, is again similar to that of Fig. 1 except that the removable wall or cover 6 of the chamber 1 is replaced by a top wall 22, the vertical side wall 3 is replaced by a wall 23
inclined to the vertical, and a removable cover 24 is provided in the inclined wall 23 whereby access can be gained to the interior of the chamber 1.
From the foregoing description of the- illustrated embodiments it will be readily appreciated that the chamber 1 is capable of considerable variation and is readily adaptable to accommodate a water inlet either in the botto j in the bow or side or partially in the bottom and partially in the bow or side of a vessel, thus providing a great degree of flexibility in the manner in which the steering and propulsion means can be provided in a vessel. The casing 8 of the steering and propulsion means is of a simple design and can readily be produced by fabrication. Moreover, access can be gained to the interior of the chamber 1 and to the internal parts of the steering and propulsion means through the removable top wall or cover 6 or 24 for servicing or routine maintenance of the steering and propulsion means, thus enabling the steering and propulsion means to be permanently secured in position and eliminating the need for expensive machined seatings in the hull of the vessel such as are required when the steering and propulsion' means has to be demountable in order to enable servicing or routine maintenance to be carried out thereon.