Marine propulsion – With indicator
Reexamination Certificate
2002-07-10
2004-01-13
Basinger, Sherman (Department: 3617)
Marine propulsion
With indicator
C073S187000, C440S038000
Reexamination Certificate
active
06676461
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a speed detecting device mounting structure for a vessel in which a speed detecting device is provided on a ship bottom plate to obtain a propelling speed of the vessel by detecting a flow rate of water by means of a paddle in the speed detecting device.
2. Description of Background Art
One of the existing types of jet propulsion boats includes a water jet pump mounted on a rear portion of the vessel body. The jet propulsion boat is propelled by sucking water from the ship bottom by driving the water jet pump and splashing or spraying the sucked water rearward. This type of jet propulsion boat is provided with a speed detecting device on the ship bottom plate at the rear portion of the vessel body for detecting the propelling speed.
For example, a speed detecting device mounting structure is disclosed in Japanese Patent Laid-Open No. 304831/11 entitled “PROPELLING SPEED DETECTING DEVICE FOR VESSELS.” This technology will be described below with reference to
FIG. 6
of the present specification, which is a view similar to
FIG. 5
of the above publication.
FIG. 6
is a bottom view of the rear portion of the vessel in the background art, showing a state in which a speed detecting device is mounted on the ship bottom plate. The vessel
100
includes a ship bottom plate
101
formed with a flowing water draining groove
102
extending in the fore-and-aft direction of the vessel. A notch
103
is formed at the rear end of the flowing water draining groove
102
. A body of revolution (hereinafter referred to as a paddle)
106
of the speed detecting device
105
is rotatably mounted on the notch
103
. Furthermore, a sensor body
108
for detecting the number of revolutions of the paddle
106
is provided in the vicinity of the paddle
106
.
According to the above speed detecting device mounting structure, when the vessel
100
is propelled by a water jet pump (not shown), water runs along the flowing water draining groove
102
as shown by the arrow a. Water flowing in the direction of the arrow a reaches the paddle
106
, strikes the blades
107
of the paddle
106
, and rotates the paddle
106
. The propelling speed of the vessel
100
can be obtained by detecting the number of revolutions of the paddle
106
by the sensor body
108
.
However, the speed detecting device mounting structure is provided with the paddle
106
at the notch
103
of the ship bottom plate
101
in the background art. Accordingly, the paddle
106
is exposed to the sea via the notch
103
. Therefore, the paddle
106
may be entangled with rubbish or seaweed drifting in the sea.
In addition, since the paddle
106
is exposed to the sea, if the vessel
100
runs ashore, the paddle
106
is in danger of contacting the sea bottom. Accordingly, the paddle
106
may be damaged or mud from the sea bottom may be picked-up by the paddle
106
, affecting proper operation of the speed detecting device.
SUMMARY OF THE INVENTION
Accordingly, the object of the present invention is to provide a speed detecting device mounting structure for a vessel in which a paddle is prevented from being entangled with rubbish or seaweed in the sea, and from being damaged by the sea bottom or picking-up mud from the sea bottom.
In order to solve the problems described above, according to a first aspect of the present invention, a vessel comprises a water jet pump provided at a rear portion of the vessel, a ship bottom plate provided below the water jet pump, a speed detecting device mounted on the ship bottom plate, a paddle of the speed detecting device being rotated by water so as to obtain the propelling speed based on the rotation of the paddle, wherein the paddle is disposed above the ship bottom plate, an opening is formed at the portion of the ship bottom plate forwardly of the paddle, and water taken through the opening is guided to the paddle.
The paddle of the speed detecting device is disposed above the ship bottom plate and an opening is formed forwardly of the paddle. By covering the paddle with the ship bottom plate, the paddle can be closed off from the sea by the ship bottom plate. Therefore, the paddle can be protected by the ship bottom plate. Accordingly, the paddle can be prevented from being entangled with rubbish or seaweed drifting in the sea.
In addition, by protecting the paddle with the ship bottom plate, even if the vessel runs ashore, the paddle is prevented from being damaged or picking-up mud from the sea-bottom.
Further scope of applicability of the present invention will become apparent detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 3706224 (1972-12-01), Overs
patent: 5369360 (1994-11-01), Amyot
patent: 5606253 (1997-02-01), Boucher et al.
patent: 5699749 (1997-12-01), Yamada et al.
patent: 6101965 (2000-08-01), Koyanagi
patent: 11-304831 (1999-11-01), None
Funayose Yusuke
Hasegawa Toru
Yashiro Tomohiko
Basinger Sherman
Honda Giken Kogyo Kabushiki Kaisha
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