JPH069997B2 - Surfing boom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a surfing boom that is lightweight and has excellent mechanical strength.

[Prior art]

In windsurfing (registered trademark), in order to perform the steering, a boom (BOOM) is used in which a boom main body composed of two curved rod-like bodies is connected by joints at both ends thereof to form a loop. Conventionally, a bent aluminum alloy pipe has been used as a main body of this boom, but such a metallic pipe is unsatisfactory in terms of lightness and strength. Akira Kaikai
According to Japanese Patent Laid-Open No. 59-13396, a boom main body using an aluminum alloy pipe in which the inside and outside of the curved pipe portion is reinforced with a carbon fiber reinforced resin is proposed.
However, since this boom has a pipe surface coated and reinforced with a carbon fiber reinforced resin, the boom is lighter than the one made of the aluminum alloy pipe and improved in terms of holding and holding by hand. However, since the main body of the boom is a pipe made of an aluminum alloy, the boom is still inferior in lightness, and the steering performance is still unsatisfactory.

〔Purpose〕

The present invention seeks to overcome the aforementioned drawbacks found in conventional surfing booms.

〔Constitution〕

According to the present invention, a plurality of carbon fiber reinforced densities 1.
Mainly made of synthetic resin pipe of 4 to 1.6 g / cm ³ , and the carbon fiber layers of the plurality of carbon fiber layers were oriented in an angle of 60 ° to 90 ° with respect to the boom axis direction. A surfing boom comprising a fiber layer and a carbon fiber layer in which carbon fibers are oriented within 30 ° with respect to the boom axis direction.

The density referred to in the present specification means the density of the fiber reinforced synthetic resin forming the pipe.

Next, the surfing boom of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing the entire surfing boom, and FIG. 2 is an explanatory sectional view of a synthetic resin pipe which constitutes a preferred surfing boom main body.

In Fig. 1, the surfing boom is the boom main body A,
It is composed of A'and joints B and B'connecting both ends thereof.

In FIG. 2, 1 is a carbon fiber layer forming the innermost layer, 3 is a carbon fiber layer arranged on the outside thereof, 2 is a synthetic fiber layer arranged in the middle thereof, and each of these fiber layers is Is formed by impregnating and hardening a thermosetting liquid resin such as an epoxy resin or an unsaturated polyester resin as a matrix resin to form an integral fiber-reinforced synthetic resin pipe.

Among the carbon fiber layers, the carbon fiber layer 1 forming the innermost layer
The carbon fiber direction is 60 ° to the boom axis direction.
Oriented at an angle of 90 °, preferably near 90 °. That is, in FIG. 3, the angle a indicated by the arrow 11 indicating the direction of the carbon fiber is 60 ° to 9 ° with respect to the line 10 indicating the boom axis direction.
It is in the range of 0 °. The carbon fiber layer 1 is usually made of a coiled wound body of carbon fibers, for example, a wound body by filament winding, a unidirectionally aligned array body, a braided body, or the like. In addition, a plurality of such wound bodies can be used by stacking them. Among these, a wound body by the filament winding method is preferable, and this is wound by winding the filament by the filament winding method while normally traversing the fiber once in the axial direction of the boom. It may be wound while traversing more than once, and when it is wound while traversing twice or more, the fibers wound in a coil shape are wound while intersecting each winding layer. The thickness of the carbon fiber layer 1 is usually 0.12 to 0.18 mm, preferably 0.14.
~ 0.16 mm.

The carbon fiber layer 3 disposed on the outer side of the carbon fiber layer 1 has its carbon fibers oriented at an angle within 30 °, preferably within 20 °, with respect to the boom axis direction. That is, in FIG. 3, the angle b of the arrow 12 indicating the direction of the carbon fiber is within 30 ° with respect to the line 10 'indicating the boom axis direction. The carbon fiber layer 3 is usually composed of a carbon fiber braid, a wound body by a filament winding method, a unidirectionally aligned array, or the like. Further, a plurality of such braids and the like can be used by stacking them. Among these, a braid is preferably used. The thickness of this carbon fiber layer 3 is usually 0.7.
It is 0 to 1.10 mm, preferably 0.80 to 0.95 mm.

By stacking the carbon fiber layers 1 and 3 with the fiber direction oriented in a specific direction as described above, it is possible to obtain a boom excellent in mechanical strength that sufficiently exhibits the tensile strength that is characteristic of carbon fiber. it can.

The synthetic fiber layer 2 interposed between the carbon fiber layers 1 and 3 is formed by using synthetic fibers such as nylon fiber, polyester fiber, aramid fiber and vinylon fiber. The synthetic fiber layer is preferably formed by orienting the fibers at an angle within 30 ° with respect to the boom axis direction. Also,
The synthetic fiber layer may be formed of a synthetic fiber woven or knitted fabric. The thickness of the synthetic fiber layer 2 is usually 0.25 to 0.38 mm, preferably 0.29 to 0.32 mm. The synthetic fiber layer 2 is significantly superior to the carbon fiber layers 1 and 3 in flexibility and elongation, prevents sudden boom breakage, and provides a boom structure with enhanced safety. Further, the synthetic fiber layer can be formed as the innermost layer or the outermost layer in addition to the intermediate layer as described above.

In order to preferably manufacture a boom main body having a cross-sectional structure as shown in FIG. 2, a carbon fiber is wound to a required thickness on a core material having a smooth surface and flexibility, and then a synthetic fiber is wound around the wound body. The woven / knitted fabric of No. 1 is arranged, and then the woven / knitted fabric of carbon fiber is arranged around it. A liquid thermosetting resin is impregnated into such a fiber laminate, and the whole is fastened with a film having a good mold release property, which is bent according to the shape of the boom and heat-cured in a curing furnace. After heating and curing, the core material and the film on the surface are removed to obtain a boom main body made of a desired carbon fiber reinforced synthetic resin pipe. When making this boom main body, various modifications are possible. For example, both carbon fiber and synthetic fiber are used as a prepreg impregnated with a thermosetting resin in advance or wound while impregnating the fiber with synthetic resin. It can be used as a wound body by filament winding, and in this case, the step of impregnating the thermosetting resin is omitted.

Further, in the boom main body of the present invention shown in FIG. 2,
The stacking order of the respective fiber layers and the structure of the fiber layers are preferably those shown in FIG. 1, but the invention is not limited thereto and various modifications are possible, for example, the synthetic fiber layer 2 is not always necessary. Besides, the carbon fiber layer 3 can be omitted, and a carbon fiber layer can be further laminated on the carbon fiber layer 3 via a synthetic fiber layer.

[Effect]

The boom main body composed of the carbon fiber reinforced synthetic resin pipe used in the present invention is light in weight (density: 1.4 to 1.6 g / cm ³ ) and has excellent compressive strength and bending strength.
The outer diameter of the boom is usually about 29 to 33 mm so that it can be easily grasped and held manually, and the pipe wall thickness is 1.2 to
It has a bending strength of about 1.6 mm, which is superior to that of conventional aluminum alloy products, even when the boom is mainly composed of such synthetic resin pipes and is not crushed or broken by a person riding on it. It was confirmed. Next, a comparison of the physical properties of the boom main body made of the synthetic resin pipe of the present invention and the conventional product (aluminum alloy pipe) will be shown.

The surfing boom of the present invention has a structure in which both ends of the two boom main bodies made of the synthetic resin pipe are connected in a loop shape by a conventional joint, and as described above, is lightweight and mechanically strong. Since it is excellent and also has an excellent grasping and holding property, it is possible to perform steering safely and easily in surfing.

[Brief description of drawings]

FIG. 1 is an explanatory view of the entire surf boom according to the present invention, and FIG.
The figure is an explanatory cross-sectional view mainly showing the boom, and FIG. 3 is an explanatory view showing the fiber directions of the innermost carbon fiber layer and the carbon fiber layers arranged outside thereof. 1,3 ... Carbon fiber layer, 2 ... Synthetic fiber layer, A, A '... Boom mainly, B, B' ... Joint.

Claims (3)

[Claims] 1. A density of 1.4 to reinforced with a plurality of carbon fiber layers.
Mainly composed of 1.6 g / cm ³ synthetic resin pipe, the plurality of carbon fiber layers are carbon fiber layers in which carbon fibers are oriented at an angle of 60 to 90 ° with respect to the boom axis direction, and carbon fiber layers. A surfing boom characterized by comprising a carbon fiber layer oriented at an angle within 30 ° with respect to the boom axis direction. 2. A pipe made of a synthetic resin having a density of 1.4 to 1.6 g / cm ³ reinforced with a plurality of carbon fiber layers and a synthetic fiber layer, the plurality of carbon fiber layers being made of carbon fibers in the boom axis direction. A surfing boom comprising a carbon fiber layer oriented at an angle within a range of 60 to 90 ° and a carbon fiber layer oriented a carbon fiber at an angle within 30 ° with respect to the boom axis direction. . 3. A synthetic fiber layer in which the fibers are oriented at an angle within 30 ° with respect to the boom axis direction.
Paragraph boom for surfing.