JPH07298809A - Fishing rod - Google Patents

Abstract

PURPOSE:To obtain a fishing rod high in rigidity and good in operability on low loads and low in the rigidity and high in strength on high loads. CONSTITUTION:The fishing rod has a fishing tube part 10 provided with a layer 14 wherein highly elastic pitch carbon fibers having a low compression strength are mainly arranged in a matrix resin in the longitudinal direction and with a layer 12 wherein inorganic fibers having a higher compression strength than that of the highly elastic pitch carbon fibers are mainly arranged in a matrix resin in the longitudinal direction, one or two of the layers 12 being laminated to the outside or to the outside and the inside of the layer 14. The fiber volume ratio of the pitch layer 14 is smaller than that of the layer 12 having the high compression strength, and the thickness (t) of the fishing tube part 10 is >=3% of the diameter of the fishing tube part.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a fishing rod.

[0002]

2. Description of the Related Art When a load is applied to a fishing rod, when the load is small, the rod tip side, which has an absolutely low rigidity, bends greatly (the maximum bending strain position comes to the rod tip side), and delicately hits the fish. In the case of a large load that can be sensed, the hand side with absolutely high rigidity bends greatly (the maximum bending strain position comes to the hand side), and a mere tensile force acts on the rod tip side so that the fishing rod is not damaged Is designed. A high-rigidity fishing rod is formed by firing a prepreg obtained by impregnating resin with high-strength, high-elasticity reinforcing fiber such as carbon fiber, glass fiber, or boron fiber. Such a high-rigidity fishing rod (which is also a fishing rod with a high tension and is also referred to as a tensioned fishing rod) has a high responsiveness and a high responsiveness as the fisherman reacts sharply to the movement of operating the fishing rod. It becomes a fishing rod.

[0003]

However, high rigidity means that the amount of bending is small even if a load is applied,
The maximum bending strain position at the time of bending is a position relatively to the rod tip side, and it is impossible to receive a load by moving it to the hand side having higher strength. Therefore, it is easily damaged.

Therefore, an object of the present invention is to provide a fishing rod which has a high rigidity at a low load and good operability, and has a low rigidity at a high load and a high strength.

[0005]

In view of the above object, the present invention provides a layer according to claim 1, in which a resin matrix is provided with pitch-type high-elasticity carbon fibers having low compressive strength and oriented mainly in the longitudinal direction. A rod provided with a layer in which a high-strength inorganic fiber having a compressive strength higher than that of the pitch-based high-elasticity carbon fiber is mainly arranged in the longitudinal direction in a resin matrix on the outer side of the layer or on both the outer side and the inner side. It has a tube portion, the fiber volume ratio of the pitch-based layer is smaller than the fiber volume ratio of the high-strength layer having the compressive strength, and the wall thickness of the rod tube portion is 3% or more of the diameter dimension. To provide a fishing rod.

According to a second aspect of the present invention, there is provided a rod tube portion in which a resin layer made of a resin having a high adhesive strength is interposed between a plurality of layers in which a reinforcing fiber is mainly arranged in a longitudinal direction in a resin matrix. To provide a fishing rod. Further, in the joint fishing rod according to claim 3, there is provided a fishing rod having a joint portion in which a hard elastic member is disposed on at least one of the joint contact surfaces of the front and rear rod pipes. To do.

[0007]

According to the first aspect of the present invention, the bending strength when a bending load is applied to a rod tube reinforced with a pitch-based highly elastic carbon fiber which is a reinforcing fiber is a pitch-based carbon called a kink band. It cannot withstand a large bending load because it is affected by the compressive failure of the reinforcing fiber due to the phenomenon of fiber strength reduction and the collapse of the rod tube (vertical cracking due to the deformation of the cross-sectional shape). Therefore, in order to ensure the crush strength when a large bending load is applied, the wall thickness is made thicker than 3% of the diameter of the rod tube, and further, outside the layer using this pitch-based high-elasticity carbon fiber, Alternatively, inorganic fibers having high compressive strength are arranged both in the outer side and the inner side mainly in the longitudinal direction to provide a large resistance to bending damage. Furthermore,
The pitch-based carbon fiber layer, which tends to have a smaller compressive strength, has a smaller fiber volume ratio and a larger amount of resin than the other layers.

A layer in which pitch-type highly elastic carbon fibers are mainly arranged in the longitudinal direction has a property that the elastic modulus against compression is high up to a certain load, but is low against a load exceeding it, so that When a large bending load is applied to the fishing rod of the present invention configured to withstand a large bending load as described above, if the load exceeds a certain value, the bending rigidity becomes low and the bending easily occurs. Therefore, the maximum strain is received on the side closer to the fishing rod (the bending strength is increased), and the fishing rod has a high strength that is less likely to be damaged. Further, due to the presence of highly elastic pitch-based carbon fiber, the bending rigidity is high at low load.

According to the second aspect, when a small load is applied to the fishing rod, there is no particular change in the resin layer between the layers in which the longitudinal reinforcing fibers are arranged, and the fishing rod operability is good. is there. When subjected to a large load and bending, the layers in which the longitudinal reinforcing fibers are arranged are displaced from each other due to the elastic action of expansion and contraction of the resin layer, which has a lower elasticity than the elastic force of these layers. Allows large deflections. In this case, since the resin layer is made of a resin having a high adhesive strength, the elastic deformation also maintains the bonding between the adjacent inner layer and outer layer.

According to the third aspect of the present invention, if a hard elastic member is provided on the contact surface of the joint, the elastic member of the joint is hard while a small load is applied to the fishing rod. Therefore, there is almost no deformation at the joint, the fishing rod operability is good, and when the fishing rod bends under a large load, it is bent at the joint by elastic deformation of the hard elastic member. Since the front rod pipe droops and the large diameter rear rod pipe will be subjected to the actual bending action, the fishing rod as a whole undergoes a large flexural deformation (large droop) and the maximum bending strain position moves to the hand side, Therefore, the strength of the fishing rod is improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on the embodiments shown in the accompanying drawings. When the bending load W acts on the fishing rod 10, the rod tip side bends, but the bending amount δ also increases as the load increases. FIG. 1 shows relational curves L1 and L2 between a load W and a deflection amount δ obtained by a fishing rod having a configuration according to the present invention described later. Shows) and the amount of deflection δ
Becomes δ0.

When the load W is increased thereafter, the increasing rate of the flexure amount δ with respect to the increasing rate of the load W becomes larger as shown by the line L2, and the flexure amount becomes δ2 when the load becomes W2. The fishing rod 10 is damaged. That is,
When the load increases, the fishing rod has low rigidity. This bending state is shown in FIG. 2, and the bending state of the bending amount δ1 shown by the two-dot chain line in FIG. 2 is the bending state immediately before breakage of the fishing rod of the conventional structure shown by the two-dot chain line L3 in FIG. This is the state of the end position of the line L3 in FIG. 1, and the increase rate of the bending amount δ is about the same as in the case of low load until the load W reaches W0. That is, it is a fishing rod with high rigidity even under high load, the maximum strain position at high load is closer to the rod tip than in the case of the fishing rod of the present invention structure, and the load resistance W1 against bending load is the above-mentioned fishing rod of the present invention. It is smaller than the load resistance W2.

An example of the structure of the fishing rod 10 is shown in FIG.
An outer layer 12 in which a high-strength inorganic fiber having a high compressive strength as a reinforcing fiber is mainly arranged in the resin matrix mainly in the longitudinal direction of the fishing rod 10, and an inner layer having a higher elasticity in the resin matrix than the inorganic fibers is provided. The inner layer 14 in which pitch-based carbon fibers having a small compressive strength are oriented mainly in the longitudinal direction of the fishing rod 10 is provided. Further, the fiber volume ratio to the total volume of the resin and the fibers of the inner layer 14 is set smaller than that of the outer layer 12. That is, the inner layer 14 has a larger amount of resin than the outer layer 12, and the pitch-based carbon fiber inner layer, which tends to have a reduced compressive strength due to the kink band, has a large degree of freedom between the fibers, and the reduction in strength is alleviated. The fiber volume ratio of the pitch-based carbon fiber of the inner layer 14 is 55 to 75%.

The high-strength inorganic fibers having high compressive strength are pan-based carbon fibers, boron fibers, silicon carbide fibers, alumina fibers, or glass fibers. Also, a mixed fiber of these may be used. The high compressive strength means that the compressive strength is higher than that of the pitch-based carbon fiber. The fishing rod 10 according to the present embodiment is required to be formed by including these two layers, but this may be the only requirement, but the inner surface and the outer surface of the fishing rod are made of resin as a matrix, and reinforcing fibers are circumferentially formed. It is preferable to provide the innermost layer 18 and the outermost layer 16 that are oriented toward each other from the viewpoint of preventing the rod tube from collapsing and breaking. There is no limitation on the reinforcing fibers used for these innermost layer and outermost layer. Further, the layer in which the reinforcing fibers are arranged in the circumferential direction with the resin as the matrix is the layer 12
Between the outermost layer and the innermost layer, and may not necessarily be formed between the outermost layer and the innermost layer.

Further, in the present invention, the wall thickness t of the rod tube with respect to the outer diameter dimension D of the rod tube of the fishing rod 10 is set to 3% or more to increase the crush resistance of the rod tube. It is preferably set to 5% or more. Further, although the reinforcing fibers of the outer layer 12 and the inner layer 14 are oriented in the longitudinal direction, it is not necessary that all the fibers be in the longitudinal direction, and most of the reinforcing fibers may be in the longitudinal direction. Many fibers in the innermost layer 18 and the outermost layer 16 are preferably in the circumferential direction, but other fibers may be braided in a net shape and may be oriented in an inclined direction with respect to the longitudinal direction of the fishing rod. .

The pitch-based carbon fiber used in the inner layer 14 has material characteristics as shown in FIG. 3, and the vertical axis represents the stress σ and the horizontal axis represents the strain ε. Show. It can be seen that the third quadrant (lower left of the figure) shows a compressive stress state, and when the compressive strain is a certain value ε0 or more, the elastic modulus decreases and the rigidity is low. However, when the pitch-based carbon fiber is formed into a thin pipe-shaped test body and a bending test is performed, the test body is broken at a small strain ε1 indicated by a point P1 and a low elasticity tendency (lines P1 and P2) is generated. Does not appear. This is due to the crushed destruction of the pipe and the kick band,
When the wall thickness of the pipe is set to be thick and the structure of claim 1 of the present invention as in the above embodiment is obtained, the strain ε2 shown at point P2 in the figure
It does not break until the condition is reached, and low rigidity characteristics appear.

That is, the tendency of low rigidity (low elasticity) shown when the pitch-based carbon fiber is used for the fishing rod 10 is to set the wall thickness of the rod pipe to be thick to prevent crushing and breaking.
Since the outer layer 12 made of inorganic fiber having high compressive strength is arranged to have high strength, the outer layer 12 is realized in the fishing rod characteristics. In the case of this embodiment, the innermost layer 18 and the outermost layer 1
Although two layers 12 and 14 are formed between the first layer 6 and the second layer 6, a sandwich structure may be used so that the layer 14 is sandwiched by a third layer having the same characteristics as the layer 12. In this case, the fiber volume ratio of the intermediate layer using the pitch-based highly elastic carbon fiber is 55 to 75% as in the case described above. Also in the case of this three-layer structure, the crush strength may be enhanced by forming a layer in which reinforcing fibers are oriented in the circumferential direction using a resin as a matrix, between each layer or in the outermost layer or the innermost layer.

The experimental results confirming the above will be described. The following test tube members were broken by a 4-point bending test. Inner diameter 10 mm Thickness Outermost layer 16: 0.03 mm Outer layer 12: 0.20 mm Inner layer 14: 0.20 mm Innermost layer 18: 0.03 mm Length 700 mm Under these conditions, pitch-based carbon fiber is used. However, when bread type carbon fiber was used for the inner layer 14, the inner layer 14 was damaged at 42.67 kgf / mm ² , but the outer layer 1
81.21 kgf when using bread-based carbon fiber for 2 and pitch-based carbon fiber for inner layer 14
Damaged at / mm ² .

That is, the pitch-based high-elasticity carbon fiber having a low compressive strength is used as the inner layer 14 instead of the outer layer 12, and if the pan-based carbon fiber or the like is used on the outer side thereof, the pitch-based Compressive strength improves and bending strength improves. Also, when a pitch system was used in the middle and a pan system was used on both sides of it, the bending strength was improved due to the improvement in compression strength.

FIG. 5 shows an embodiment according to the second aspect of the present invention. Between the innermost layer 18 and the outermost layer 16 which are similar to the innermost layer 18 and the outermost layer 16, a reinforcing fiber is mainly composed of a resin as a matrix of the fishing rod 10. Three layers 22 oriented longitudinally,
Between layers 24 and 26, a layer 28 and a layer of a resin having a large adhesive strength (adhesion) with an epoxy resin, such as a thermoplastic resin such as polyetherimide (PEI), nylon, or polyetheretherketone (PEEK). Forming 30. Here, the type of reinforcing fiber of the three layers 22, 24, 26 does not matter, but the resin layers 20, 30 are generally these layers 2.
2, 24 and 26 are less elastic, and the resin layers 20 and 30 are layers 22 and 2 of these reinforcing fibers when the bending load is large.
Since it expands and contracts more than 4,26, the layers of the reinforcing fibers can be relatively displaced, and the fishing rod 10 can be flexed more. That is, it exhibits a lower rigidity characteristic.

In this case, since the adhesive strength of the resin layers 28 and 30 is high, the bonding between these layers and the resin layer may be peeled off when the layers 22, 24 and 26 are relatively displaced. Absent. Also, while the load is small, each layer 22, 24, 2
No. 6 bends without shifting and has a predetermined high rigidity and good operability.

FIG. 6 shows an embodiment of a joint type fishing rod according to the third invention. The splicing method may be a parallel splicing method or a squeezing method. The layer 11 of the hard elastic member is formed on the inner peripheral contact surface S of the rear side rod tube 10B of the joint portion 10AB of the front side rod tube 10A and the rear side rod tube 10B. The reinforcing layer 13 of the joint portion 10AB is formed on the outer periphery of the rear rod tube 10B. Examples of the hard elastic member include hard rubber (preferably having a rubber hardness of 50 or more) such as silicon rubber, fluororubber, and silicon rubber, and an elastomer resin, as shown in FIG. The ring spring 11 'formed in the above may be inserted and formed in a part of the depression in the circumferential direction or the depression 10b of the entire circumference. This leaf spring or the like has a hardness such that it hardly deforms under a small load, like hard rubber, but it must also deform and restore under a large load. In addition, the rod tube body 10
Softer than A and 10B.

Further, it is necessary that the hard elastic member is arranged at a softer position on the rod tip side and harder on the rod base side.
It is necessary to change the hardness depending on the kind of rod that makes the target fish different.

When a small load is applied to the rod tip of the above-mentioned joint type fishing rod, since the layer 11 and the ring spring 11 'are formed of a hard member, the front and rear rods are located at the joint portion 10AB. The fishing rod does not bend like bending the tubes 10A and 10B. However, when a large load is applied, since the layer 11 and the ring spring 11 ′ are hard, but have elasticity, the load acts on the front rod tube 10A, so that the inside of the rod tube 10B is Circumferential layer 11 and ring spring 1
1'is deformed so as to be depressed by receiving a force pushing up from the rear end of the rod tube 10A, whereby the front side rod tube 10A bends and bends at the joint portion 10AB, and the fishing rod as a whole exhibits a larger bending deformation. .

This means that the fishing rod has a reduced rigidity, and the maximum strain position is further retracted to the rod base side, and the breaking strength is improved accordingly. In this embodiment, the layer 11 of the hard elastic member and the ring spring 11 'are formed on the inner circumference of the rear rod tube 10B, but may be formed on the outer circumference of the front rod tube 10A. Also,
It is also possible to form both.

If the rod tube portion of any one of the above three forms of the present invention is formed in the front side from the position of approximately half of the entire length of the fishing rod, and the rear side is in the normal form, the load is high and the strength is high. The weak front region bends quickly and bends so as to receive almost only the tensile force (droop), and the maximum strain position is located at the rear of high rigidity and high strength so that it is hard to be damaged and has high strength. Due to the shape of the rod tube, the tension of the fishing rod can be maintained and the operability is good. However, this structure is not limited to the front half, but may be about the front one-third, or may be configured behind the half. Further, it is not always necessary to continuously configure, for example, with six connecting rods, only the second rod pipe and the fourth rod pipe from the front side are configured.

[0027]

As is apparent from the above description, according to the present invention, the rigidity is high when the load is low and the operability is good, and the rigidity becomes low when the load is high, so that the maximum strain position retreats toward the hand side. However, it becomes a fishing rod with high strength.

[Brief description of drawings]

FIG. 1 is an operation explanatory view of a fishing rod according to the present invention.

FIG. 2 is an explanatory auxiliary view of FIG.

FIG. 3 is an auxiliary view for explaining the action of the fishing rod according to the present invention.

FIG. 4 is a vertical cross-sectional structural view of a fishing rod according to the first invention.

FIG. 5 is a longitudinal sectional structural view of a fishing rod according to the second invention.

FIG. 6 is a longitudinal sectional structural view of a fishing rod according to the third invention.

FIG. 7 is a longitudinal sectional structural view of another embodiment of the fishing rod according to the third invention.

[Explanation of symbols]

 10 Fishing Rods 10AB Joints 11 Layers of Hard Elastic Member 12 Outer Layer 14 Inner Layer 28, 30 Adhesive Layer

Claims (3)

[Claims] 1. A layer in which a high-strength carbon fiber of pitch type having a low compressive strength and a low tensile strength is arranged mainly in the longitudinal direction in a resin matrix, and a resin matrix is provided outside the layer or both inside and outside the layer. The rod-shaped tube portion is provided with a layer in which inorganic fibers having a higher compressive strength than the pitch-based highly elastic carbon fiber are arranged mainly in the longitudinal direction, and the fiber volume ratio of the pitch-based layer is the compression ratio. A fishing rod characterized in that it is smaller than the fiber volume ratio of the high-strength layer, and the wall thickness of the rod tube portion is 3% or more of the diameter dimension. 2. A rod tube portion, wherein a resin layer made of a resin having high adhesive strength is interposed between a plurality of layers in which reinforcing fibers are mainly arranged in a longitudinal direction in a resin matrix. A fishing rod that does. 3. A joint type fishing rod, comprising a joint portion in which a hard elastic member is disposed on at least one of the joint portion contact surfaces of the front and rear rod tubes.