JPS61207287A - Spherical bow unit for vessel - Google Patents

Abstract

PURPOSE:To improve the propulsion performance without damaging the bodies when pushing a vessel by making a spherical bow section formed with such material as having the shock-absorbing performance mountable at the bow section of hull below the water level. CONSTITUTION:A spherical bow section 2a formed with such material as rubber, rubber plastic, etc. having the shock-absorbing performance is made mountable on the bow section of hull of tug boat below the water level. The spherical bow section 2a has a recess 2b to be inserted with the bow 1 while fixing flanges 2c are formed at the opposite sides and fixed through bolts to the bow section. Consequently, the propulsion performance can be improved without damaging the bodies when pushing a vessel.

Description

[Detailed Description of the Invention] [Field of Commercial Use] The present invention provides a spherical bow provided on tugboats, ferryboats, fishing boats, and other vessels to easily reduce wave-making resistance, which also has buffering performance. It is related to the spherical bow device of the ship that can be mounted. [Traditional technology and its problems] Large, in the middle of the middle of the middle, to improve the wave -opening resistance during navigation and improve the propulsion performance. The so-called bulbous bow of the Ushimu was formed integrally with a steel plate during the construction of the hull. However, attaching steel-structured protrusions under the water surface of small vessels such as fishing boats, ferriports, small fishing boats, and harbor tugboats that frequently come close to the shore is not recommended for the hull of the other party (shore AI, other vessel, stranded vessel, etc.). damage to the hull of
It is common for ships of this type to have fenders above the water surface without any protrusions below the water surface.

[Means for solving problems]

In view of this, the present invention has been developed to use a material other than a spherical bow plate suitable for the ship's bow shape 1 and the size of the ship, and which will not damage the own ship or the other ship's hull even if it comes into direct contact with another ship's hull. Manufactured separately from the hull using different materials, new ship 1
Alternatively, it can be easily attached to the bow of an existing ship to improve propulsion performance1, and the bulbous bow can also be used as an underwater fender, and it can also be used to replace damaged bulbous bows. [Example] The present invention will be described below based on an example shown in the drawings.

FIG. 1 is an external view showing an outline of an embodiment applied to an existing tugboat. FIG. 2 is an enlarged plan view of the main parts.

In the figure, reference numeral 1 indicates the hull of a tugboat, which has a hull shape and size that are more suitable for work capacity, etc.

The bow 2a is formed so that it does not protrude further forward than the fender 3 of the bow deck below the water surface.
3 is a fender above the water surface that is attached to the upper bow of the bow.This fender 3 is made of rubber, plastic, etc., and is made of rubber, plastic, etc., and is made of rubber or plastic, etc. It is formed by Reference numeral 2 denotes a spherical bow mounted below the water surface, and its shape is determined to reduce wave-making resistance, but the shape shown in the drawing is one example and the shape is not limited. Like the fender 3, the spherical bow fender 2 & is also made of rubber, plastic, etc., and is made of a material that will not damage the hull of the other ship even if it comes into contact with the other ship and is pushed.

In this case, it is deformed within an allowable range under the pushing pressure, but it has the strength and resilience to not be damaged by the pushing pressure.1. Eggplant. This spherical bow has a recess 2b in the center of its rear end into which the bow is inserted so that it can be attached to the bow of a ship, and 7 langes 2C are integrally formed on the outer periphery of the rear end. Fasten to the hull. For example, if this 7 lange 2C is made of steel plate arranged and fixed along the rear i circumference of the spherical bow, then this 7 lange 2C is
It is also possible to weld the o and the hull or bolt it to the hull. In this case, 7 lunges 2C
The vessel is designed in advance so that when the bulbous bow is aligned with the bow, the seven lunges will fit into the hull, and its shape will match the curved surface of the hull. Further, the fender 2a at the tip of the spherical bow 2 is manufactured separately from the main body of the spherical bow 20, so that even if it is damaged, it can be reused by replacing only this tip. The details are shown in Figures 3 and 4. ◇Figure 3 is an enlarged view of the shock absorber section cut vertically along the hull center line, and Figure 4 is an enlarged view of the same shock absorber section cut horizontally. shows. In Fig. 3 and 4Fg:i, 2 is a steel plate part of the spherical bow, and a cap-shaped rubber fender 2a is attached to the outer surface of this part. 04 is a steel plate embedded in the rubber fender 2a, and the rubber fender Thank you for the reinforcement, also 5
are bolts attached to the bulbous bow 2 at appropriate intervals. This bolt 5 is inserted into a bolt hole made in the steel plate 4 and the rubber fender 2&, and by tightening the nut 6, the steel plate 4a inside the rubber fender is tightened.
When all the nuts are tightened, this rubber 7-inch fender is fixed to the bulbous bow ◇The rubber fender is -
Or it is manufactured by dividing it into two or more parts.

3a is a soft rubber inserted as a cushioning material between the rubber fender and the steel spherical bow. After tightening the nuts,
When tightening the nut on the fender, the hole is closed with a stopper 7a made of the same material as the fender, and the surface is made smooth. Furthermore, although the fender is made of rubber or plastic, it is desirable that the outer surface be smooth in order to minimize resistance to seawater.

〔Effect of the invention〕

According to the present invention, a spherical bow that matches the shape of the ship is manufactured separately from the ship's hull using an elastic material other than a copper plate for the underwater bow of the ship, and is attached to the bow of the ship. Therefore, it can be installed on both newly built ships and existing ships, and even when used on tugboats, it will not damage the other ship or own ship when pushing the ship.It can also be used as a fender under the water surface, and it can be used as a fender installed above the water surface. - acts as a buffering material, and has the following effects: ``Effective boat pushing work is possible@Furthermore, the propulsion performance is improved, and it is easy to install.

[Brief explanation of the drawing]

FIG. 1 is an external view of one embodiment, and FIG. 2 is a plan view of the main parts. FIG. 3 is a longitudinal section of the main part, and FIG. 4 is a horizontal section of the main part. l is the hull, 2 is a bulbous bow, 2& is a fender-12b is a recess, 2G is a 7 lange, 3 is a fender-14 is a steel plate, 5
is Boruto, and 6 is Natsuto. Patent applicant: Osaka Shipbuilding Co., Ltd.

Claims (1)

[Claims] A spherical bow that matches the shape of the hull can be pre-formed and attached to the bow part of the hull below the water surface using a material that has a buffering performance that allows the boat to be pushed without damaging the other boat or the own boat when pushing the boat. A spherical bow device for a ship, which is characterized by improved propulsion performance and can be used as a fender under water.