JPS6128557B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to fiber reinforced plastics (hereinafter referred to as FRP).
This relates to the improvement of the propeller inspection port structure for ships manufactured in Japan.

If a rope or the like gets wrapped around the propeller or its shaft, it can cause damage to the propulsion device or steering device, so an inspection hole is installed in the bottom of the ship above the propeller to inspect it and remove foreign objects. This inspection port has traditionally been installed from inside the ship, but the uneven thickness of the FRP bottom plate and uneven surface require time and effort to adjust and smooth it. That is,
The bottom plate of an FRP ship is made smooth by molding on the outside of the ship, but unevenness tends to occur on the inside of the ship, and the thickness of the bottom plate is also inconsistent. For this reason, work is required to smooth the inspection port mounting area on the inside of the ship, and unevenness occurs on the outside of the ship after the inspection port is installed due to variations in board thickness. Furthermore, unevenness occurs on the outer surface of the bottom of the ship, which disturbs the water flow, which increases propulsion resistance and adversely affects the performance of the propulsion device.

This invention was made to solve these conventional drawbacks, and provides an inspection port structure that allows for easy installation of the inspection port and also allows for a smooth outer surface of the bottom of the ship. It is something to do.

That is, the present invention is an inspection port formed in the bottom of the ship above the propeller, and includes an inner edge member having a transparent plate in the center, a main body fitted into the through hole, and a flange on the periphery surrounding the through hole. It has an outer edge member superimposed on the outer surface of the hull, the inner edge member being attached to the main body of the outer edge member, and the collar of the outer edge member being attached to the outer plate surface.

Embodiments of the present invention will be described below with reference to the drawings. In Figures 1 and 2, 1 is a hull outer plate, 2 is a propeller, 3 is a rudder plate, 5 is a propeller shaft, 30
is a rudder shaft, and an inspection port 4 is provided in the upper bottom plate 10 of the propeller 2. The inspection port 4 is arranged slightly to the side of the propeller 2 rather than directly above it, but this is because it is more convenient to see the bottom of the propeller 2 than if it were formed directly above it. Of course, it may be formed directly above.

As shown in FIGS. 3 and 4, the inspection port 4 includes an inner edge member 6 having a transparent plate 40 in the center and an inner edge member 6.
It consists of an outer edge member 7 into which the outer edge member 7 is fitted, and a collar portion 71 is formed to protrude from the outer periphery of the lower end of the outer edge member 7. The transparent plate 40 is fixed with a presser member 41 so as to cover the through hole formed in the center of the inner edge member 6, and the inner edge member is fitted inside the outer edge member 7, with a gasket 72 interposed between the two. By tightening bolts 60, the two are connected in a watertight structure. The outer edge member 7 is formed into an annular body with a U-shaped cross section as shown on the right side of Figure 4, and only the mounting position of the bolt 60 is made solid as shown on the left side of Figure 4 to improve the effectiveness of the bolt. I have to.

The edge member having such a structure is inserted into the through hole of the bottom plate 10, overlapped with the flange 71 and the outer surface of the bottom plate 10, and tightened and fixed with the bolts 70. The outer surface of the bottom plate 10 is a molded surface of FRP lamination, and since it is a smooth surface, the surface in contact with the flange 71 can be easily smoothed by applying an appropriate gasket or sealing material without smoothing it with a grinder or the like. In addition, since the inner surface 11 of the bottom plate, which is a non-shaped surface, becomes the contact surface of the nut for the bolt 70, there is no need to smooth it.
Even if there are variations in the plate thickness, it will only change the amount of tightening of the nut and will not affect the mounting position of the edge member in any way. Therefore, the outer surface of the bottom of the ship after the inspection port 4 is installed can be made completely smooth. Also the fifth
As shown in the figure, if the part where the flange 71 touches is recessed by the thickness of the plate when forming the hull, the lower surface of the edge and the lower surface of the bottom plate 10 will be completely flush with each other when the inspection port 4 is installed. The smoothness can be further improved.

Conventionally, as shown in FIG. 6, the inspection port 44 is inserted into the through hole of the bottom plate 10 from above, so the inner surface 11 of the bottom plate is ground with a grinder in advance so that the area where the flange 72 comes into contact is It had to be smoothed, which was time-consuming. Also, the bottom plate 10
Due to variations in the plate thickness, it is inevitable that a step will occur between the lower surface of the edge member and the lower surface of the bottom plate 10, and the unevenness of this part will cause turbulence in the water flow, increasing propulsion resistance. At the same time, propulsion performance was also hindered.

In this way, this invention has a structure in which the propeller inspection port is installed from the outside of the bottom plate.
The work of smoothing the contact surface can be omitted, and since it is not affected by variations in plate thickness, smoothness on the outer surface of the bottom can be achieved reliably, contributing to improved propulsion resistance and propulsion performance. It is something.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the stern bottom showing an embodiment of the present invention, Fig. 2 is a plan view of the arrowed part, Fig. 3 is a plan view of the edge member, and Fig. 4 is an inspection of Fig. 1. FIG. 5 is an enlarged view of the mouth and a sectional view taken at the - line position in FIG. 3; FIG. 5 is a sectional view showing another embodiment;
FIG. 6 is a sectional view of a conventional inspection port. 2...Propeller, 4...Inspection port, 6...Inner edge member, 7...Outer edge member, 10...Bottom plate, 40
...transparent board.

Claims (1)

[Claims] 1. An inspection port formed in the bottom of the ship above the propeller, which includes an inner edge member having a transparent plate in the center, a main body inserted into the through hole, and a peripheral flange overlaid on the outer surface of the ship around the through hole. made of fiber-reinforced plastic, wherein the inner edge member is attached to the main body of the outer edge member, and the collar of the outer edge member is attached to the outer surface of the outer panel. Propeller inspection port structure on ships.