JPH0761392A - Blow-molded boat - Google Patents

Abstract

PURPOSE:To improve the strength of the broadside part of a blow-molded boat without increasing a material cost and the weight of a ship hull and to prevent the occurrence of a dent and formation of a hole in the broadside part. CONSTITUTION:A blow-molded boat comprises a lower ship hull 12 containing a boat bottom part 11 and forming the lower part of a ship hull; and an upper ship hull 13 assembled to the lower ship hull 12 and forming the upper part of the ship hull. Both the lower and upper ship hulls 12 and 13 are a blow- molded boat consisting of a hollow body having a double wall structure produced by blow-molding. Since a ratio (H1/Y) between the height and the lateral width of the lower ship hull 12 is low, the thickness of each part is uniformized and the thickness of the outer wall of a broadside part is prevented from being especially decreased. When the lower and upper ship hulls 12 and 13 are assembled together, the inner and outer wall of the central area of the broadside part are brought into a state to be interconnected through two plates (a) and (b) and the part is reinforced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding boat having a hull made of a plastic blow molding body.

[0002]

2. Description of the Related Art A hollow plastic leisure boat having a double-wall structure is known as a small boat used for leisure in the sea, rivers, ponds, etc. (for example,
See JP-A-60-12182). This type of boat 1 (see FIG. 4) is integrally molded by blow molding plastic and is a hollow body having a double wall structure as a whole, and the inner and outer walls of the double wall are welded to each other on the bottom part 2 ( The welded portion 3) is formed, and in some cases vertical ribs are formed on the bottom surface of the outer wall to enhance rigidity.

On the other hand, the space between the double walls is wide on the port side portion 4 in order to secure the buoyancy and the restoring force, and it is difficult to weld the inner and outer walls to increase the rigidity. Therefore, depending on the case, the concave ribs 5 in the vertical direction are formed on the outer wall to improve the rigidity, but the resistance is limited to only the upper half of the port side because water resistance near the water surface.

By the way, in the boat 1 integrally formed by blow molding, the wall thickness of the outer wall of the port side portion 4 is relatively thin. That is, in blow molding, a plastic cylindrical parison is sandwiched between opposing molds, and air is blown into the parison to expand it and obtain a predetermined shape along the inner surface of the mold. This is because the degree of stretching of the parison differs depending on the location, and in the molded body having the shape like the boat 1, the degree of stretching of the outer wall A of the port side portion 4, particularly the location indicated by A ′, increases. This tendency becomes stronger as the ratio h / w of the height h and the width w of the boat 1 increases. The lower half part of the port side outer wall A cannot be increased in rigidity by the ribs as described above, and is the part most likely to hit the quay or rock, so that the impact easily causes dents or perforations. . If the wall thickness of this portion is increased to increase the strength, it is necessary to increase the wall thickness of the entire hull, which increases the material cost and the hull weight.

Further, the inner and outer walls of the port side portion 4 of the boat 1 are inclined outward over the entire height h of the boat 1. This is because when the blow-molded boat 1 is extracted from the mold, a draft is required over the entire height h,
The width w1 of the bottom 2 of the boat 1 is small in spite of the large width w, and the usable floor area is also small. Then, for example, in the case where the bottom of the boat is fixed to the roof of the automobile and the top of the port side portion 4 is fixed, the width of the boat 1 is limited by the mounting width of the roof of the automobile, and thus the width of the boat 1 is limited.
Could not take up a large floor area.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional example, the present invention increases the strength of the port side portion 4 without increasing the material cost and the weight of the hull, and causes dents or holes in the port side portion. The purpose of this is to prevent the occurrence of water and to obtain a boat having a large floor area for its width.

[0007]

A blow-molded boat according to the present invention comprises a lower hull including a bottom portion of the hull and a lower hull, and an upper hull assembled on the lower hull and constituting an upper part of the hull. The lower hull and the upper hull are each made of a hollow body having a double wall structure formed by blow molding. As a specific mode, the lower hull and the upper hull are detachable, and the upper hull is Is composed of a plurality of parts, each of which is composed of a hollow body having a double wall structure formed by blow molding, and the top of the upper hull overhangs toward the cabin.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to FIGS. 1 to 3 below. A blow molding boat 10 includes a bottom portion 11 and a lower hull 12 which constitutes a lower portion of the hull.
(Horizontal width Y, height H ₁ ) and an upper hull 13 (horizontal width Y, height H ₂ ) that constitutes the upper part of the hull are assembled with bolts 14 and the like (see FIG. 4). Each of 13 is a hollow body having a double wall structure formed by blow molding. And the upper hull 13 is the lower hull 12
It does not cover the central part 15 of the stern (hence the upper hull 13
Has an approximately C-shape when viewed from above), and an outboard motor (not shown) is installed here.

The lower hull 12 and the upper hull 13 are provided with opposite slopes on the port sides, and the lateral width at the joint between the hulls 12 and 13 is widest. Then, the top portion 16 of the upper hull 13 projects inward, and a mounting seat for the roof of the automobile is formed here. Looking at the internal structure, at the joint between the upper and lower hulls 12 and 13, almost the entire circumference of the hull (port side, bow, and part of the stern) is surrounded, and two plates a and b are connected to the inner and outer walls. ing. Ship bottom 11
Then, as in the conventional example, the inner and outer walls are welded in places.

In this boat 10, the height-width ratio H ₁ / Y or H 2 / Y of the lower hull 12 and the upper hull 13 can be set to be considerably smaller than the ratio h / w of the conventional boat 1. Therefore, the degree of stretching of each part by blow molding is made relatively uniform, the variation in wall thickness over the entire inner and outer walls is reduced, and the outer wall thickness on the port side is prevented from becoming particularly thin. Moreover, the inner and outer walls of the outermost part of the port side are connected to each other by two plates a and b, which are reinforced so that they are strong against impacts, and when they hit the quay or rock, there are dents and perforations on the port side. It is prevented from occurring. Since the two plates a and b surround the almost entire circumference of the hull and connect the inner and outer walls, the rigidity of the hull structure is extremely high, and the average wall thickness of the inner and outer walls is reduced accordingly. It is possible to reduce the weight of the hull (with the same external dimensions as the conventional example, it is possible to reduce the weight by about 30% without reducing the rigidity).

Further, in this boat 10, the lower hull 12
Since the inclination of the upper hull 13 is reversed, compared to the conventional example, the width Y ₁ of the bottom 11 can be set large for the size of the lateral width Y of the hull, and the boat with a large floor area can be obtained. Can be obtained. In addition, on this side of the boat
Since 6 is projected inward and a seat for attaching to the roof of the automobile is formed on this, it is possible to carry a boat having a wide bottom width Y ₁ and a floor area on the automobile in comparison with the installation width of the automobile roof. it can. For example, if the boats have the same mounting width, it is possible to obtain a boat having 1.2 times the weight and twice the floor area of the conventional example.

In the boat of the above embodiment, the upper hull is integrally molded, but this is divided into several parts (for example, divided into two in the longitudinal direction of the hull), and each is molded by blow molding. However, it may be assembled at the time of use. The upper hull may have an O-shape that completely covers the stern, instead of the C-shape. Further, the inclination of the upper hull is not limited to the above-mentioned embodiment, and can be arbitrarily set, and the projecting shape of the top part can be arbitrarily set including the presence or absence thereof. Further, the assembling surfaces of the lower hull and the upper hull may be formed in one plane as in the embodiment, but one or more convex portions are formed on one side of the assembling surface and the other side is formed. It is also possible to form a concave portion that matches that and to fit both.

[0013]

According to the present invention, it is possible to prevent the wall thickness of the outer wall of the port side portion from being thinned, and to strengthen the intermediate region of the port side portion (the assembly surface of the upper and lower hulls) so that the port side portion has a dent or hole. It is possible to prevent the occurrence of perforation, and there is no increase in material cost and hull weight. And, in the assembling surface of the upper and lower hulls, since the two plates surrounding the entire circumference or almost the entire circumference of the hull are connected to the inner and outer walls, the rigidity of the hull structure becomes very high, Therefore, the average wall thickness of the inner and outer walls can be reduced to reduce the weight of the hull. Further, since the slope of the port side of the lower hull and the slope of the port side of the upper hull can be set separately, it is possible to obtain a boat having a large floor area at the bottom of the ship for its lateral width. Further, when the top of the upper hull is projected to the cabin side, a boat having a large floor area can be mounted on the roof of an automobile or the like and transported for its mounting width.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a blow molding boat of an embodiment as viewed in the stern direction.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is a cross-sectional view of an assembly portion of a lower hull and an upper hull.

FIG. 4 is a cross-sectional view of a conventional blow molding boat.

[Explanation of symbols]

 10 Blow-molded boat 12 Lower hull 13 Upper hull

Claims (4)

[Claims] 1. A lower hull including a bottom portion of the hull including a bottom of the hull, and an upper hull assembled on the lower hull and forming an upper part of the hull, the lower hull and the upper hull being formed by blow molding. A blow molding boat characterized by comprising a hollow body having a double wall structure. 2. The blow molded boat according to claim 1, wherein the lower hull and the upper hull are removable. 3. The blow molding boat according to claim 1, wherein the upper hull is composed of a plurality of parts, each of which is a hollow body having a double wall structure formed by blow molding. 4. The blow-molded boat according to claim 1, wherein the top of the upper hull projects to the cabin side.