JPH0616182A - Spare buoyancy device - Google Patents

Abstract

PURPOSE:To increase stability even under a fully loaded state by forming a recession on the broad side of a ship, pivotally mounting the cover of the recession on its upper part so as to be freely closable, attaching a buoyancy bag to the inside of the cover, and providing an air supply means for the buoyancy bag. CONSTITUTION:Several spare buoyancy devices 1 are provided in a longitudinal row on the broad side of a ship. Each spare buoyancy device 1 has a recession 3 provided on the broad side, and a cover 5 is pivotally mounted on the upper part of the recession so as to be vertically closable. A chain stopper 7 is provided to prevent the cover 5 from opening wider than 90 degrees. A rubber buoyancy bag 9 is attached to the inside of the cover 5, and connecting to an air pump 11 provided within the ship through a pipe 13. When the buoyancy bag 9 is used, air is supplied from the air pump 11 to the buoyancy bag 9 to expand it, and the bag 9 thereby pushingly open the cover 5 as it expands to go out of the ship (into a water). The cover is restricted by the chain stopper 7 to be openable so wide as upto 90 degrees.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preliminary buoyancy device for temporarily improving the stability of a ship in bad weather.

[0002]

2. Description of the Related Art In a conventional ship, stability is enhanced by injecting seawater into a ballast tank to lower the center of gravity during stormy weather. However, it is not possible to add more ballast water when the load is full.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a preliminary buoyancy device which can improve stability even in a fully loaded state.

[0004]

Means for Solving the Problems A recess is formed on the port side of a ship. A lid for closing the concave portion is pivotally attached to the upper portion of the concave portion so as to be openable and closable. Attach a floating bag inside the lid.
A means for sending gas to the floating bag is provided.

A stopper may be provided so that the lid does not open more than horizontally so that the lid receives the buoyancy of the inflated floating bag.

[0006]

[Operation] Normally, the floating bag is shrunk and stored in the recess,
Cover the recess with a lid. When used, send gas to the bladder to inflate it. Then, the floating bag pushes the lid open and goes out of the recess.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Several preliminary buoyancy devices 1 are provided side by side on the port side of a ship. It may be provided in one row, or may be provided in two rows above and below as shown by the chain line in FIG. Each preliminary buoyancy device 1 is provided with a concave portion 3 on the port side, and a lid 5 is pivotally attached to the upper portion of the concave portion so as to be vertically openable and closable. Chain stopper 7 to prevent lid 5 from opening more than horizontal
To provide. A rubber floating bag 9 is attached to the inside of the lid 5. The floating bag 9 is connected to an air pump 11 provided inside the ship by a pipe 13.

The preliminary buoyancy device 1 thus constructed is
Normally, as shown in the left half of FIG. 1, the floating bag is shrunk and housed in the recess 3 and the lid 5 is closed. Therefore, there is no increase in propulsion resistance.

When used, air is sent from the air pump 11 to inflate the floating bag 9. Then, the floating bag 9 expands, pushes the lid 5 open, and goes out of the ship (in the water). Since the lid 5 has the chain stopper 7, the lid 5 is opened horizontally, and the buoyancy of the expanded floating bag 9 is supported by the lid (right half of FIG. 1).

When this device is operated, the buoyancy is increased by the volume of the floating bag, so that the amount of water scavenging becomes small, and it becomes possible to escape in case of a grounding. Also, because the bladder is far from the center of the ship, the stability of the bladder increases as the bladder expands. For this reason, it is effective when used when there is an intention to overturn in stormy weather.

[0011]

As described above, just by sending gas to the floating bag stored in the recess and inflating it, the lid opens and the inflated floating bag comes out of the ship, so that the ship receives additional buoyancy. Obtainable. Therefore, the stability is increased and escape from capsizing in typhoon or other stormy weather. In addition, since additional buoyancy is obtained, when the hull floats up and runs aground, it can escape by itself. When not in use, the recess is covered by the lid, so there is no increase in propulsion resistance.

If a stopper is provided so that the lid does not open more than horizontally and the buoyancy of the expanded floating bag is received by this lid, the structure is simple and no excessive force is applied to the floating bag.

[Brief description of drawings]

FIG. 1 is a concave cross-sectional view of a ship equipped with a preliminary buoyancy device.

FIG. 2 is a side view of the same ship.

[Explanation of symbols]

 1 Preliminary buoyancy device 3 Recessed portion 5 Lid 7 Chain stopper 9 Floating bag 11 Air pump

Claims (2)

[Claims] 1. A recess (3) is formed on the port side of a ship, and a lid (5) for closing the recess is pivotally attached to the upper part of the recess so as to be openable and closable, and a floating bag (9) is provided inside the lid. A preliminary buoyancy device equipped with a means (11) for attaching a gas to the floating bag. 2. The preliminary buoyancy device according to claim 1, wherein a stopper (7) is provided to prevent the lid from opening more than horizontal so that the buoyancy of the inflated buoyancy bag is received by the lid.