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BACKGROUND OF THE INVENTION
1. Field of the Invention:
This invention relates in general to semi-submersible marine craft or
boats, and has specific reference to a semi-submersible marine craft
adapted to be power-operated in both surface and semi-submerged
conditions. The craft consists essentially of a pair of parallel spaced
tubular floats disposed horizontally, symmetrically on either side of a
vertical median plane, and of a central nacelle containing a power unit
and a passenger's cabin.
2. The Prior Art:
Various types of marine craft, such as the so-called water-bikes or
pedalled craft, have already been proposed for seaside leisure and
amusement parks. A popular marine craft of this kind has a pair of
parallel spaced floats of such length, cross-section and material that
they impart the necessary buoyancy on water. Seats are arranged between
the floats for the users who can thus assume a seated position in which
they can efficiently actuate bike-like pedals driving either a paddle
wheel or a screw disposed at the rear end of the craft. Thus, the craft is
driven by the users' muscular energy. When the users get tired, they stop
pedalling and the craft bobs up and down on the waves. These crafts,
however, cannot be used for the observation of underwater marine fauna and
flora.
The inconvenience of such known craft accounts for the increasing trend
towards skin and scuba diving and underwater fishing, notably for the
observation of marine fauna and flora by the divers. It is, however,
necessary on the one hand to acquire the necessary diving equipment and on
the other hand to have the physical fitness necessary for participating in
these sports. Moreover, skin and scuba diving are both a hazardous sport.
Divers must accordingly comply with safety regulations which in many cases
are rather burdensome.
So-called "pocket" submarines used either for warfare or peaceful purposes
in underwater exploration or various underwater interventions are also
known. These submersibles cannot be used as instruments of leisure, since
they call for considerable training of the users and also for a top
physical condition.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a
semi-submersible marine craft or boat adapted to be propelled both on the
water surface and in a semi-submerged state. The semi-submersible craft
has a pair of parallel, laterally spaced tubular floats disposed
horizontally symmetrically on either side of a median vertical plane of
symmetry of the craft. A central structure functions as a hull provided
with a power unit. This central structure is in the form of a nacelle
comprising a watertight cabin for one or more passengers and means for
semi-submerging the craft and also for controlling its ascent back to the
surface. Furthermore, the craft comprises control and safety devices for
controlling the underwater and surface operation of the craft.
THE DRAWINGS
FIG. 1 is a side-elevational view, with parts broken away, of the
semi-submersible craft according to the present invention;
FIG. 2 is a plan view from above, with parts broken away, of the
semi-submersible craft of FIG. 1;
FIG. 3 is a front view of the semi-submersible craft of FIG. 1;
FIG. 4 is a diagrammatic side-elevational view of the central structure or
hull of the semi-submersible craft, illustrating the cabin in dash lines;
FIG. 5 is a detail view, on a larger scale, illustrating ballasts connected
through detachable means, notably of the "twistlock" or swing bar type, to
the semi-submersible craft, with means for automatically jettisoning the
ballast;
FIG. 6 is a connection diagram of balloons housed in the lateral tubular
floats of the semi-submersible craft;
FIG. 7 is a connection diagram of a device for automatically jettisoning
the ballast; and
FIG. 8 is a connection diagram of a fire detector and apparatus for
controlling flooding of the different hull compartments.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings, the semi-submersible craft 1 consists of three
main elements, namely a pair elongate, parallel spaced tubes or tubular
floats 2, 3 disposed horizontally on either side of a median vertical
plane 4, and of a central nacelle 5. The tubular floats function as
flotation and water ballast floats. The central nacelle 5 is divided into
three sections, namely, a front compartment 6 comprising a cabin 7 for the
passengers, a central or control gear compartment 8 and a stern
compartment 9 housing the power or drive unit 10.
The central nacelle 5 of the semi-submarine craft 1, like the parallel
lateral tubular floats 2, 3, is a frame structure 11 made of welded
stainless steel sections 12 and of a skin 13, 14 made of fiberglass,
carbon fibre or other suitable multi-layer fabric alternating with resin
layers.
The frame structure 11 of the central nacelle 5 comprises a plurality of
arches 15 disposed in a vertical plane and corresponding substantially to
the shape of the skin 13. These arches 15 are interconnected by lower and
upper longitudinal members 16, 17 respectively. The frame structure 11
further comprises, in a rear and bottom portion 18, means 19 for
supporting the power unit 10. The support means 19, like the other
component elements of the frame structure 11, consists of preferably
tubular section members such as members 12 assembled by welding or
otherwise.
The lateral parallel tubular floats 2, 3 comprise preferably a plurality of
annular elements spaced from one another in a vertical plane by means of
longitudinal members extending throughout the length of the floats 2, 3.
The cross-sectional shape of this structure is subordinate to that of the
skin 14.
Preferably, the skin 14 of the tubular floats 2, 3 has a substantially
ovoid configuration. However, to promote the flow of water along the
floats 2, 3 when operating underwater, the skin 14 may have a V-shaped
streamlined lower portion 20. Similarly and preferably, the bow and stern
ends 21, 22 of the floats 2, 3 have a shape consistent with the laws of
hydordynamics.
Advantageously, the skin 14 consists of two half-shells 23, 24 assembled by
bolting. This feature greatly facilitates the assembling and disassembling
of the floats 2, 3. However, to improve the rigidity of the floats 2, 3,
it is preferable to merge their structure with that of the lower
half-shell 24 by using fiberglass, carbon fibers or like fabric, in
conjunction with a suitable resin.
The skin 13 of the central nacelle 5 has a substantially spherical
configuration around the cabin 7, with transparent areas comprising a
bulbous front portion 25 and lateral windows or port lights 26, 27. The
transparent areas afford the passengers a panoramic view, for a convenient
observation of the underwater fauna and flora. In contrast thereto, this
skin 13 has a parallelipipedic configuration around the stern compartment
9 and comprises on its top surface 28 a hatch closed in a watertight
manner by a removable hatch cover 29 to facilitate the access to the power
unit 10.
The central nacelle 5 is also provided with a dome or hood 30 covering
partially the front portion 31 of front compartment 6. This dome 30
facilitates the access of the passengers to cabin 7 of the
semi-submersible craft 1. For this purpose, the dome or hood 30 is
hingedly mounted to the front compartment 6 and adapted to open rearwardly
of the craft 1 by pivoting about a horizontal hinge pin 32.
Advantageously, this dome 30 is also provided with watertight closing
means preventing the ingress of water into the cabin during the
semi-submerged operation of the semi-submarine craft 1.
According to a preferred form of embodiment, this watertight closing device
consists of a wheel-type system operating dogs, well known in the field of
sea-going craft. Of course, this water-tight closing device may also be of
simpler design, for example, in the form of a seal applied to the lower
edge 33 of the dome 30 and adapted to be compressed against an upper edge
39 of front compartment 6 when closing the dome or hood 30 by using any
suitable and known locking device.
Whatever the means adopted for closing the dome, it is essential that the
dome 30 can be opened from both inside and outside the cabin 7, so that in
case of technical or human failure rescuers can intervene rapidly.
It will be seen that due to the moderate stress exerted on the dome 30, the
dome can be made from a skin of synthetic resin or like material, without
any rigid framing structure.
Each tubular float 2, 3 is connected to the central nacelle 5 by means of
links 35 consisting of tubular sections each having hinge means, not
shown, between their ends which permit a ninety-degree upward movement of
the floats. Due to this hinged connection between the floats 2, 3 and the
central nacelle 5, the overall width of the semi-submersible craft 1 can
be reduced appreciably while facilitating its transport by road. Besides,
the front portions 36 of the floats 2, 3 are also inerconnected by
another, arcuate tubular member 37 having a hemispheric cross-section,
which also acts as a bumper or means for efficiently protecting the front
bulb 25 in case the semi-submersible craft 1 hits an obstacle.
Preferably, the semi-submersible craft 1 is also provided with an open-work
floor 38 supported by the rear portions 39 of tubes 2, 3. This open-work
floor 38 may be used for transporting several passengers, for instance,
skin divers.
According to the instant invention, the semi-submersible craft 1 comprises
means for enabling the crew to operate the craft under semi-submerged
conditions, and also to surface again.
The submerged depth 40 of craft 1 is less than the total height 41 of the
front compartment 6 and dome 30, so that in all cases the top end 42 of
this dome 30 emerges above the water level. The dash and dot lines 43 and
44 of FIG. 1 correspond to the water surface when the semi-submersible
craft 1 is on the surface, shown at line 43, and when it is
semi-submerged, shown at line 44.
The diving and surfacing operations of the semi-submersible craft 1 are
controlled by means of ballast control elements or units 45, 46 consisting
of balloons 47 of rubberized fabric housed in tubes 2 and 3. These
balloons 47 are filled or exhausted with air accordingly as the craft 1 is
on the surface or submerged. Preferably, four balloons 47 are incorporated
in each tube 2, 3 and connected by pairs through conduit means 90. By
scaling down their numbers, the safety of the sea craft 1 can be increased
considerably, notably in case of puncture of one of said balloons 47. In
fact, the other non-punctured balloons 47 are still capable of keeping the
craft afloat.
A compressor 48 is housed in the control or technical compartment 8 and is
connected through hoses 91 to the balloons 47. The compressor provides an
output sufficient for inflating these balloons. The craft 1 is submerged
by exhausting air from the ballast control units 45, 46 and allowing water
to enter into the tubular floats 2, 4 through apertures 49 provided for
this purpose in the skin 14 of the floats.
It can thus be seen that the craft is provided with flotation control means
for variably controlling the buoyancy of the craft by controlling entry of
water into the flotation and water ballast floats and the discharge of
water therefrom for variably controlling volumes of water ballast in the
floats to control the extent of partial submergence of the craft.
Also preferably, when the semi-submersible craft 1 is submerged, air is
supplied to the compressor 48 and exhausted therefrom via a hose 50
connected thereto and opening into the upper portion 51 of the dome 30.
This hose 50 may be provided at this open end 30 with a stop-valve or like
device for obturating this end when the craft 1 is fully submerged.
The ballast units 45, 46 are selectively inflated or deflated by means of
solenoid valves 92, the operation of which is controlled from the pilot's
control console 52 in the front portion of the cabin 7. Also preferably,
the compressor 48 is of the electric type and supplied with current from
one or more storage batteries housed in the rear compartment 9, and this
compressor can be controlled by means of a switch (not shown) disposed on
the control console 52.
According to another specific feature of the present invention, the
semi-submersible craft 1 comprises a complete set of control and safety
apparatus for monitoring the craft in both submerged and surface
operational conditions.
Thus, in case of failure of compressor 48, it is definitely necessary to
have the possibility of surfacing the craft 1. For this purpose, the craft
1 is provided with means 53 for automatically inflating the balloons 47.
Preferably, these means 53 consist of one or a plurality of compressed-air
tanks 54 provided with an air regulator 93 and housed in the technical or
control compartment 8 behind the passengers' seats 55. These
compressed-air tanks 54 permit inflating the balloons 47 within a short
time so that the marine craft 1 can break surface almost instantaneously.
The air-tank regulator 93 can be actuated from two different locations,
that is, either from the control console 52 or from the top 42 of dome 30.
This dual safety arrangement is effective, in case of emergency such as a
failure of the passengers enclosed in the cabin 7, for controlling from
outside the surfacing of the craft 1. Preferably, the release of the
air-tanks 54 regulators can also be controlled manually in case of
electric circuit failure. The semi-submersible craft 1 also comprises, in
its lower portion 56, ballast means 57 permitting of obtaining and
maintaining the craft in this semi-submerged condition. These ballast
means 57, which are four in number in this example and disposed on either
side of a central longitudinal tunnel 58, consist of bars 59 filled with a
high-density material such as lead, cast-iron or else. The bars 59 are
releasably fastened by means of suitable means such as "twistlock" devices
60 to rails 61 secured in turn by means of fasteners 62 to the frame
structure 11 corresponding to the central nacelle 5 of the craft. These
releasable fasteners are adapted, under the control of automatic
jettisoning means 60', to disconnect the ballasts 57 of craft 1 and thus
cause the craft to break surface almost instantaneously by buoyancy. This
automatic jettisoning device 60' is incorporated in the control and safety
equipments of craft 1.
In a preferred form of embodiment of the invention, shown in FIG. 5, the
releasable fasteners or "twistlock" means 60 consist of hooks 63 pivotally
mounted on rails 61 or to the lower ends of legs 62. Gripping means 64
rigidly connected to the ballast bars 59 are engaged in the hook 63, the
gripping means 64 consist in fact of studs 65 projecting from the lateral
sides 66 of bars 59. On the other hand, the device 60 for automatically
jettisoning the ballasts 57 comprises means 67 for rotating the hooks 63
and thus release the studs 65 therefrom. These rotary driving means 67
comprise essentially a fluid-actuated cylinder 68 housed in one
compartment 6, 8 or 9 of the central nacelle 5 and adapted to rotate a rod
69 extending through the floor 70 of the semi-submersible craft 1. This
rod 69 is connected in turn by means of arms 71 to the hooks 63 so as to
cause the hooks to pivot about their horizontal axes, when required.
Preferably, the cylinders 68 are of the pneumatic type supplied with
compressed air from an air tank 72 also housed in the technical
compartment 8 of the central nacelle 5. A manually-operated valve 94 is
provided for controlling from the pilot's or control console 52 the
release of compressed air from air-tank 72 and therefore to the cylinders
68. The safety may be further enhanced by providing complementary means
for controlling automatically the jettisoning of the ballasts 57 from the
craft 1, said complementary control means being disposed in the upper
portion 51 of the dome 30.
The semi-submersible craft 1 is driven by a power unit 10 housed in the
stern compartment 9 of central nacelle 5. The power unit 10 comprises a
preferably electric motor 73 supplied with current from one or a plurality
of storage batteries 74 also housed in the stern compartment 9. However,
for both technical and economical reasons, the semi-submersible craft 1
may be provided with an internal combustion engine. In this case, fuel
tanks, for example, for gasoline or gasoil, are housed in the stern
compartment 9 and substituted for the storage batteries 74.
The power unit 73, whether of the electric or internal combustion type, is
attached to the support means 19 of frame structure 11 and drives a
propeller 75 via a transmission shaft 76 and a propeller drive shaft
housing 77 of the directional type. The propeller drive shaft housing 77
is pivotally secured to the transom 78 of stern compartment 9 and
incorporates two sets of 90-degree bevel gears (not shown) due to the
lower position of the axis of rotation of propeller 75 with respect to the
transmission shaft 76. With this arrangement, the propeller 75 is
constantly kept below the water surface, even when the craft 1 is
progressing on the surface. Moreover, to improve its water-intake
efficiency, it is preferable to arrange the propeller 75 below the bottom
56 of the craft. However, the distance between the propeller axis and the
transmission shaft 76 should preferably be minimized for optimizing the
stress distribution among the component elements of the frame structure 11
of the central nacelle 5. For this purpose, a central longitudinal tunnel
58 is provided in the bottom of the marine craft 1 to improve the water
intake efficiency of propeller 75 while keeping to a relatively low value
the distance between the propeller 75 and the transmission shaft 76.
The above-described propeller drive shaft housing 77 is well known in the
art and very popular in the domain of inboard leisure boats. The propeller
shaft housing 77 is of the type adapted to pivot about a vertical axis and
therefore acts as a rudder for steering the marine craft 1. A cable
transmission system (not shown) interconnecting a swing-bar attached to
the propeller shaft housing 77 and a helm wheel 80 mounted on the control
console 52 permit the manoeuvering of the marine craft 1.
According to another feature characterizing the present invention, the
marine craft 1 is provided with three capacitive depth sensors fathometers
95, 96, 97 disposed on its outer wall at different heights corresponding
to the surface 98, half-immersion 99 and maximum imersion 100 positions,
respectively, of the craft. The function of these capacitive depth sensors
or fathometers is to control the submergence depth of the craft. For this
purpose, computerized means 101 responsive to the capacitive sensors are
operatively connected to the control and safety equipments of the marine
craft 1.
Thus, as a consequence of the electric signal emitted by the capacitive
fathometers and of the data displayed on control console 52 by the
helmsman, the computerized management means open or close the
solenoid-operated valves and cause the operation or stopping of compressor
48 for draining or filling the ballasts 45 and 46, respectively.
Another function devolved to the above-described computerized management
means consists in correcting the list and trim of the marine craft 1 in
both surface and underwater operating conditions without any resorting to
any manual intervention. These corrections are made according to data
received by a photoelectric cell 102, recording the evolution of a
weighted disk in front of a light beam. The list of the craft is corrected
by controlling accordingly the inflation or deflation of the balloons 47
corresponding to one or the other ballast control units 45 or 46,
respectively. On the other hand, due to the arrangement of said balloons
47 in each float 2, 3, the trim of the marine craft 1 can be corrected by
varying the inflation pressure of the two balloons 47 disposed in the fore
portion of each float 2, 3 with respect to the other two balloons 47
disposed in the aft portion of the floats. The control action exerted by
the computerized data management means 10 on the inflation pressure of
each pair of balloons 47 is obtained by means of solenoid-operated valves
92 controlling the inflation and the deflation.
Other functions devolved to the above-described computerized management
means 101 consist in controlling the quick upward movement of the marine
craft 1 in case of failure of any equipment thereof. Thus, in case of
failure of compressor 48 and the consequent pressure drop in air-tanks 54,
the computerized management means are effective to control, via a solenoid
valve 103, the expansion of the compressed air contained in air-tank 72
and therefore the jettisoning of the ballasts 57. This jettisoning may
take place as a consequence of data emitted from a fourth capacitive depth
sensor or fathometer 104 displaying the position or depth of the craft 1
below the surface, this fathometer being disposed on top 42 of the dome
30.
Preferably, the marine craft 1 is also provided with means for controlling
the flooding of any compartment 6, 8 or 9, the control means
advantageously consists of other capacitive probes 105, 106, 107 disposed
in the bottom of each compartment 6, 8, 9 and adapted, when the presence
of water is detected in one or more of said compartments, to deliver an
electric signal converted into a light or sound signal 108. These
capacitive probes may also control directly the operation of a bilge pump
109. In case the passengers did not react to the signals thus emitted,
another set of capacitive probes 110, 111, 112, disposed at a higher level
than the preceding ones will control through suitable computerized
management means 101 and solenoid-operated valves 92, 117 the release of
jettisoning of ballasts 57 of the quick inflation of balloons 47.
According to the instant invention, the computerized data management means
incorporated therein permit drawing up of a complete and immediate balance
concerning the operation of all the apparatus of the marine craft 1 before
each submergence. For this purpose, the air-tanks 54 and 72 of the
automatic inflation device 53 for balloons 47 and of the automatic
jettisoning device 60 of ballasts 57, respectively, are provided with
pressure regulators 113, 114. Thus, according to the data signal emitted
by these regulators, the computerized data management means permit or not
the submergence of the marine craft 1. Care will be taken that the data
concerning the limit threshold pressure values below which the
seaworthiness of craft 1 is not sufficient to warrant a safe submergence
be stored beforehand in the computerized data management means.
It is a frequent occurence that, during a submergence operation, relatively
great temperature differences develop between the exterior and the
interior of the cabin 7, so that moisture or condensation is deposited on
the transparent areas of skin 13. To avoid this inconvenience of fogging
or steaming of the transparent areas, the marine craft 1 comprises
ventilation means 88 for preventing this condensation deposit. The
ventilation means 88 comprise a fan for taking air from the external
atmosphere and forcing it into the cabin 7 through hose 89 provided with
outlet ports disposed in the lower portion 81 of the bulbous front portion
25 and of the lateral windows 26, 27. This external air is taken at the
level of an inlet port disposed in the upper portion 51 of dome 30; the
inlet port is also used for exhausting the air contained in the cabin 7.
Preferably, this port, like conduit 50, is provided with valve means for
closing the port in case of complete submergence of the marine craft 1.
To improve the efficiency of the above-described ventilation means, the air
blown into the cabin 7 is firstly heated by means of electrical
resistances arranged in ports disposed under the transparent areas.
Another improvement of these ventilation means consists in providing the
ports with means for adjusting and orienting the flow of air blown into
the cabin 7. Thus, by properly controlling the adjustment and orienting
means, the occupants of the craft can direct the air flow towards the
transparent areas of skin 13 and adjust the magnitude of this flow. Of
course, these adjustment means may be exactly similar to those now in
conventional use on land vehicles for adjusting and orienting the air flow
toward the windshield on the vehicle.
The safety equipment of this marine craft 1 is completed by a fire detector
installed in the stern compartment 9 housing the power unit 10. This fire
detector may consist, for example, of a temperature sensor 115 capable of
delivering an electric signal when the temperature rises above a
predetermined or threshold value. This signal is converted into a sound or
light signal 108 and/or impulses controlling a fire extinguisher 116. Of
course, the temperature sensor may be replaced by any other device capable
of detecting a fire or incipient fire developing in the stern compartment
9 of marine craft 1. Thus, a smoke detector may be substituted for this
temperature sensor.
For preventing fire hazards, the stern compartment 9 may be provided with
ventilation means 82 for supplying combustion air to the power unit 10 and
cooling the motor or engine 73. If an internal combustion engine is used,
the ventilation means 82 further permit supplying of the engine with
oxygen and exhausting the inflammable fuel vapors. The fresh or external
air supply is made as in the other above-discussed cases via a conduit 83
housed in the dome 30 and opening into the upper portion 51 thereof. It
will be seen that the internal combustion engine exhaust gas may be
released in the atmosphere through either an exhaust pipe opening to the
exterior of the skin 13 or an exhaust silencer incorporated in the
propeller drive shaft housing 77. This latter solution is currently
adopted in boats equipped with such propeller drive shaft housing 77.
Moreover, the marine craft 1, according to the present invention, comprises
a number of safety equipments necessary for navigation, such as a
helm-angle indicator, a compass, a VHF radio emitter, a periscope. On the
other hand, the dome 30 is provided with a radar concentrator or reflector
cup, a rotating beacon or strobe flasher 84 for visual detection of the
marine craft 1 when submerged, and an aerial consistent with the
radio-transmitter. The dome 30 is also provided with the required
navigational lights 85.
Finally, the marine craft 1 is provided with a set of comfort equipments
comprising the furniture necessary for enabling the cabin 7 to accommodate
one or more passengers, a grating or open-work floor 38, handrails and the
like permitting the transport of one or more divers under the maximum
safety conditions. Search lights 87 for illuminating the sea bottom and
enhancing the colors and scenery thereof may also be provided at the lower
front portion 86 of the craft.
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