JPH0643200B2 - Boom for surfing - Google Patents

Description

TECHNICAL FIELD The present invention relates to a boom for surfing.

(Prior art) For surfing, as is well known, a sail is attached to a mast attached to a surfboard via a universal joint,
A boom attached to the middle of the mast is used to hold the sail in an expanded state and to operate the sail. This boom is formed by connecting two ends of two outwardly curving booms to form an endless shape. In addition, one end of each boom body is nested so that the length can be expanded or contracted according to the size of the sail to be replaced according to the strength of the wind, and the pin is inserted into one of several holes in cascade. The structure is such that they can be selectively engaged and locked to each other.

This surf boom is made of aluminum alloy because it is necessary to operate the sail and to operate the sail, but in recent years, the inner and outer surfaces of the aluminum tube have been reinforced with carbon fiber reinforced resin for the purpose of lighter weight and strength. Something has been developed (Japanese Utility Model Laid-Open No. 59-13396), and recently, a lighter one is required to improve its steering performance.

(Problems to be Solved by the Invention) For this purpose, the main body of the boom, which is the main part of the boom, may be entirely made of carbon fiber reinforced resin or the like without using an aluminum tube or the like as a core tube. , The boom main body is provided with a pin hole or a rivet hole at both ends, and a pin inserting hole for expansion and contraction at the rear end, and these holes are arranged symmetrically at both ends of the diameter passing through the center. Therefore, there is a disadvantage that the strength of the boom subject is markedly reduced in this part.

(Means for Solving the Problems) In contrast, the present invention forms a boom main body and a joint pipe connected to the boom main body as a synthetic resin pipe reinforced with a carbon fiber layer or a carbon fiber layer and a synthetic resin layer, and Aluminum pipes are integrally attached to the inner surfaces of the pin-fastening holes and the rivet-fastening holes and a portion extending over a plurality of holes for inserting pins through a glass fiber reinforced resin layer to maintain the strength of the portions. The combination of carbon fiber, which is strong in compression but brittle in tension, and aluminum, which easily bends but is strong in tension, is combined.

That is, according to the present invention, two boom main bodies that curve outward are connected to the jaws by riveting or pinning the front ends, and a joint pipe is formed between each rear end and the end pipe connected to the connector. In a boom formed by inserting and connecting a boom main body and a joint pipe through a hole penetrating in the diametrical direction and a pin engaging with the hole, the boom main body and the joint pipe are made of carbon fiber layer or carbon. It is formed as a synthetic resin pipe reinforced with a fiber layer and a synthetic fiber layer, and further, an aluminum pipe is attached to the inner surface of the portion having the connection hole through a glass fiber reinforced resin layer. A surfing boom is provided and comprises a carbon fiber layer or an outwardly curving synthetic resin tube reinforced with a carbon fiber layer and a synthetic fiber layer, the ends of which are provided with A surfing boom characterized in that it has a hole for connection provided in a radial direction, and an aluminum pipe is attached to the inner surface of the portion having the hole for connection through a glass fiber reinforced resin layer. Further, a main body is provided, and further comprises a carbon fiber layer or a straight synthetic resin pipe reinforced with a carbon fiber layer and a synthetic fiber layer, and both ends of the synthetic resin pipe are diametrically transparent for connection. Provided is a boom joint pipe for surfing, which is characterized in that an aluminum pipe is attached to an inner surface of a portion having a hole and having the above-mentioned hole for connection via a glass fiber reinforced resin layer.

The term "synthetic fiber" as used in the present invention means "a fiber formed of a polymer material chemically synthesized from a low-molecular compound as a raw material" and does not include carbon fiber or glass fiber. is there.

(Embodiment of the Invention) Referring to the drawings, an embodiment of a surfing boom according to the present invention will be described. As shown in FIG. 1, the two boom main bodies 1, 1 are bow-shaped members that curve outward. The front and rear ends of each are connected to the V-shaped jaw 2 and the connector 3, respectively, to form a single endless frame. In this case, the connection with the jaw 2 is integrally fixed by rivets (or pins) 4. The connector 3 is connected by an engagement pin and a plurality of holes so that the connection length can be adjusted. That is, as is clear from FIG. 2, the connector 3 is provided with end pipes 5, 5 having the same diameter as the boom main body 1 fixed to the bifurcated portion by rivets 6, and the tip of the end pipe 5 and the rear of the boom main body 1 are attached. Engaging the joint pipe 7 over the ends, and engaging pins 9 and 9 which are projected and retracted in the diameter direction via springs 8 provided near both ends of the joint pipe 7, respectively.
Are locked to an arbitrary set of several holes 10 provided in the boom main body 1 and several holes 11 provided in the end pipe 5 so as to be fixed to each other.

The above-mentioned boom main body 1,1 and joint pipes 7,7 and end pipes 5,5, etc. are all made of synthetic resin pipes reinforced by three fiber layers with carbon fiber layers sandwiching the synthetic fiber layers from the front and back. Further, an aluminum tube having a required thickness is bonded as an innermost layer to the portion through which the connecting hole is formed, which is formed through the glass fiber reinforced resin layer.

3 and 4 are cross-sectional views of the boom main body 1 and the joint pipe 7, respectively, showing the carbon fiber layer 12 forming the inner layer.
The carbon fiber direction is 60 to 90 ° with respect to the axial direction of the pipe,
Usually, it is a coil-shaped wound body oriented at an angle of about 90 °, and its thickness is usually 0.12 to 0.18 mm, preferably 0.
It is 14 to 0.16 mm. Also, the carbon fiber layer 13 forming the outer layer
Is a braid oriented at an angle within 30 ° with respect to the axial direction of the tube, usually within 20 °, and its thickness is usually from 0.70 to
It is 1.10 mm, preferably 0.80 to 0.95 mm. These carbon fiber layers 12,1
The synthetic fiber layer 14 in the middle of 3 is formed of synthetic fibers such as nylon fiber, polyester fiber, aramid fiber, and vinylon fiber, and has excellent flexibility as an interposer. This synthetic fiber layer preferably has fibers that are oriented in the axial direction of the tube.
It is formed by orienting at an angle within 30 °. This synthetic fiber layer may be formed of a synthetic fiber woven or knit fabric, and the thickness of the synthetic fiber layer is usually 0.25 to 0.38 mm, preferably 0.29 to
It is 0.32 mm. This synthetic fiber layer, compared to the carbon fiber layer,
It has outstanding 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.

Further, holes for connection, that is, holes 4'and holes 10 for passing rivets 4 in the boom main body 1, holes 9 ', 9'for pins 9,9 in the joint pipe 7, and end pipes 5 are provided. An aluminum tube 15 having a required thickness is adhered as an innermost layer through a glass fiber reinforced resin layer 16 at a portion where each of the holes 11 is processed, and the inner diameter is pressed to a predetermined diameter. This glass fiber reinforced resin layer,
It is preferably laminated on the aluminum tube 15 via an insulating primer resin, for example, a phenolic thermosetting resin or an epoxy thermosetting resin layer. In this case, the primer resin layer enhances the adhesive force with the aluminum tube and also acts as an insulating layer to prevent the aluminum tube from being touched.

(Operation and Effect) With the above-described configuration, the present invention has the glass tube reinforced resin layer 16 in the aluminum pipe (wall thickness: 0.4 to 1 mm) 15 in the portion where the boom connection hole is processed as described above. Since it is integrally formed through the resin, it is extremely tough as in the part without holes, and synthetic resin with carbon fiber reinforced resin layers 12 and 13 sandwiching the synthetic fiber reinforced resin layer 14 except the part with holes. pipe (density: = 1.4~1.6g / cm ³⁾ at a 1.5-fold in terms of strength bending as compared to conventional aluminum alloy pipe, 1.1 times as excellent in compression, further from about 1/2 in weight Thus, the entire boom is strong and lightweight.

Further, when the carbon fiber reinforced resin layers 12 and 13 are arranged so that their fiber directions are different from each other, the above effect is further improved.

In the present invention, the matrix synthetic resin forming the boom main body 1, the joint pipe 7 and the like is made of a cured product of epoxy resin or unsaturated polyester resin. Also,
The boom main body according to the present invention may be formed by only the carbon fiber reinforced resin layer, omitting the synthetic fiber reinforced resin layer.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view and FIG.
FIG. 1 is an exploded plan sectional view of the expandable portion of FIG. 1, and FIGS. 3 and 4 are planar sectional views showing a multiple structure of a boom main body and a joint pipe, respectively. 1 ... Boom mainly, 2 ... Joe, 3 ... Connector,
4, 6 ... Rivet, 5 ... End tube, 7 ... Joint tube, 8 ... Spring, 9 ... Pin, 4 ', 10, 11 ...
Holes, 12, 13 ... Carbon fiber reinforced resin layer, 14 ... Synthetic fiber reinforced resin layer, 15 ... Aluminum tube, 16 ... Glass fiber reinforced resin layer.

Claims (3)

[Claims] 1. A boom main body comprising two outwardly curved booms, each front end of which is connected to a jaw by riveting or pinning, and each rear end of which is inserted with a joint pipe between the end pipe and a connector. In a boom formed by connecting a boom main body and a joint pipe through a hole penetrating the diametrical direction and a pin that locks in the hole, the boom main body and the joint pipe are formed of a carbon fiber layer or a carbon fiber layer. A boom for surfing, characterized in that it is formed as a synthetic resin tube reinforced with a synthetic fiber layer, and an aluminum tube is attached to the inner surface of the portion having the connection holes through a glass fiber reinforced resin layer. . 2. A carbon fiber layer or a synthetic resin pipe which is reinforced with a carbon fiber layer and a synthetic fiber layer and is curved outward, and both ends of the synthetic resin pipe are diametrically transparent for connection. A surfing boom main body, characterized in that an aluminum tube is attached to the inner surface of the portion having a hole and the hole for connection described above through a glass fiber reinforced resin layer. 3. A straight synthetic resin pipe reinforced with a carbon fiber layer or a carbon fiber layer and a synthetic fiber layer, and both ends of the synthetic resin pipe have holes for connection which are pierced through in the diameter direction. Then
An aluminum pipe is attached to the inner surface of the portion having the connection hole through a glass fiber reinforced resin layer, and a boom joint pipe for surfing.