JPH0570408B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Field of Application) The present invention relates to a fishing gear having a hook connected to the tip of a fishing line, and a fishing line that can be used for the fishing gear. (Prior Art and Problems to be Solved by the Invention) Conventionally, nylon threads have generally been used as fishing lines, but fishing lines made of nylon threads tend to curl during repeated stretching. There was a problem. For example, in fishing gear, the fishing gear beyond the fishing line usually consists of a main line, a Harris line connected to the main line, a fishhook, etc. Conventionally, nylon thread has generally been used as the main line and Harris line. When this nylon thread is repeatedly stretched, it gradually becomes curly, causing problems such as dry threads, Harris threads, etc. getting entangled with each other. For example, when a large fish bites the hook at the end of the Harris line, or when a fish is caught over and over again, the nylon threads that make up the Harris line and the main line expand and contract, causing curls, causing the Harris line to become curly. It becomes entangled with the main thread. However, if the Harris thread becomes entangled with the main thread, its length will become shorter and the fish will not be able to bite.
Also, even if you try to untangle the threads, the process is quite troublesome, and even if you try to untangle them, they will quickly become tangled again. (Means for Solving the Problems) The present invention has been made to solve these problems. The first invention of the present application is characterized in that the fishing line is made of a thin wire material of a shape memory alloy. Another invention of the present application relates to a fishing gear, which includes a fishing gear connected to the tip of a fishing line, in which at least a main line portion of the fishing gear is made of a fine wire material of a shape memory alloy. Features. (Functions and Effects of the Invention) As described above, the first invention of the present application is a fishing line made of a thin wire material of a shape memory alloy. Shape memory alloys have the property that even if they are deformed at low temperatures (martensitic phase state), they will recover to a pre-memorized shape when heated to a predetermined temperature. It is used in various fields. The mechanism of shape recovery in this shape memory alloy is thought to be as follows. Shape memory alloys form a body-centered cubic ordered lattice when in the high-temperature phase (austenite phase), but at low temperatures they undergo transformation and are formed by combining martensite brother crystals (variants) with different orientations. do. When an external force is applied in this state, the interface between the sibling crystals moves as the deformation occurs due to a slight force, and the sibling crystal that is suitable for deformation eats the other sibling crystal, forming a single crystal. In the case of shape memory alloys, martensitic crystals often have low symmetry crystal structures such as monoclinic or triclinic, and the orientation in which they return to the high temperature phase during reverse transformation is limited. Since the phase is a regular phase and no reverse transformation that would destroy it can occur, it is thought that the reverse transformation due to heating returns to the original shape and the deformation disappears. In other words, in ordinary metals, when an external force is applied, the arrangement of crystals rearranges and progressive dislocation slip occurs, causing permanent deformation, but in the case of shape memory alloys, the relationships between the crystals remain the same. Since the crystal returns to the austenite phase until the initial stage, the entire crystal returns to its original shape, and this is thought to be the reason for the shape recovery. These shape memory alloys include Ni-Ti alloy, Cu
-Zn-Al alloys are representative, Ti-Ni-Cu, Ti
-Ni-Fe, Cu-Zn, etc. are known as shown in Table 1, and their transformation temperatures vary depending on their composition, but currently they are not practical due to their shape memory and strength properties. What is used as a
Most of them are Cu-Zn-Al alloys, especially Ni-Ti alloys.

[Table] Even in this Ni-Ti alloy, the transformation temperature can be adjusted and set over a wide range. In other words, in the case of this Ni-Ti alloy, its composition is a stoichiometric composition, that is, a ratio of 1:1 (Ni: 50% in atomic %,
When shifting from Ti: 50%) to the excessive Mi side, the Ns point changes greatly, and as shown in Figure 6, the V,
3D transition metals such as Cu, Mn, Fe, Co (however, V, Cu, and Mn are not illustrated in the figure) or
By adding a third element such as Al or Si, the transformation temperature can be varied. Furthermore, the transformation temperature can be changed not only by the composition but also by processing conditions and heat treatment conditions. In the case of such a Ni-Ti alloy, it is possible to change the Ms point in the range of -180 to 100°C. The thin wire material made of this shape memory alloy has greater strength than conventional nylon thread, and has better corrosion resistance than ordinary metal wire. When the fishing line is constructed, the fishing line does not break due to abrasion in the water and can be used for a long period of time. In addition, shape memory alloys can be used to process materials with a thickness of 0.2 mm or 0.1 mm, which cannot be processed using ordinary metals such as stainless steel.
It is possible to draw the wire to an extremely small diameter (for example, in the case of stainless steel, it is difficult to make it this thin through work hardening), and in the case of ordinary metal,
If the diameter is made to be this small, it will break midway through, making it difficult to use as a fishing line, but thin wire made of shape memory alloy is flexible, so it is difficult to use it as a fishing line. Does not occur. Due to its flexibility (the low-temperature martensite phase as well as the high-temperature austenite phase has flexibility) and its small diameter, when used as a fishing line underwater, it is as hard as a conventional metal wire. It does not feel loose, it floats like a nylon thread with the flow of water, and fish bite easily. In the case of shape memory alloys, the low-temperature martensitic phase is softer, but the high-temperature austenite phase also has flexibility, so it can be used in either state, and in some cases both structures can be used. It is also possible to use them in a mixed state. In this case, it is preferable that the fishing line made of a thin wire made of a shape-memory alloy has a linear shape memorized in advance. say,
(Includes cases where it is made into a large diameter coil),
In this case, if the transformation temperature is set at a temperature higher (e.g., slightly higher) than the water temperature (e.g., the highest water temperature from winter to summer), deformation will occur in the water, which will become martensitic. In this case, it can be pulled up and left in the air, or heated by sunlight, hot water, or other means to restore it to a previously memorized linear shape. On the other hand, if the transformation temperature is set so that the shape memory alloy is in the austenitic state in water, the shape memory alloy thin wire becomes harder than in the martensitic state, but it appears to be harder in water than in air due to the resistance of water flow, etc. It is more supple and fish bite better. In addition, in both the former and latter cases, the shape memory alloy thin wire material is flexible and at the same time has a certain degree of rigidity, that is, stiffness, so it can prevent the threads from getting tangled, and even if the threads do get tangled, they can be easily removed. This can be unraveled. Particularly in the latter case, the shape memory alloy thin wire in the austenitic state exhibits pseudoelasticity in water, meaning that it has greater elasticity when external force is applied than a normal wire, and it can be greatly elongated by external force and the external force is removed. Because it has the property of returning to its original shape like rubber when it is cut, when fishing for sweetfish, for example, the fishing line wraps around the body of the sweetfish based on its pseudoelasticity and tightens it elastically. It has the effect of not letting go of the fish, allowing you to successfully catch the fish without letting them escape. In this sense, in the present invention, it is desirable to use the shape memory alloy thin wire material in a state where it exhibits pseudoelasticity in water. Note that shape memory alloys may not exhibit a clear transformation point when subjected to severe working, but in this case as well, similar effects can be obtained by using them under pseudoelastic conditions. Next, another invention of the present application uses a fine wire material made of a shape memory alloy for the main thread part of a fishing gear, and according to the present invention, even when nylon thread is used as the Harris thread, This prevents the thread from getting tangled with the main thread. This is because the trunk thread is made of a different material from the nylon thread, and moreover, it is stiffer than the nylon thread. Also, even if the Harris thread gets entangled with the main thread,
You can easily unravel this. In the present invention, both the main thread and one or more Harris threads extending from the main thread can be made of thin wire material made of shape memory alloy, and in this case as well, entanglement of the threads can be prevented; however, Since the Harris thread extends from the main thread, even if only the main thread is made of a thin shape-memory alloy wire material, there is an advantage that entanglement of the threads can be effectively prevented. In the present invention as well, it is preferable that the shape memory alloy fine wire forming the main thread or Harris thread is shaped into a linear shape in advance. (Example) Next, an example of the present invention will be described in detail based on the drawings. In FIG. 1, reference numeral 10 is a fishing line, and a fishing line 14 is connected to the tip of the fishing line via a connecting fitting 12. This device part 14 has a trunk line 16 which is also a fishing line made of shape memory alloy, and a trunk line 1.
It consists of Harris threads (nylon threads) 18, 20 as fishing lines connected to the fishing line 6, and a fishing hook 22 fixed to the tip of each Harris thread 18, 20. The trunk thread 16 made of a shape memory alloy has a thickness of 0.1 mm, and is preliminarily memorized into a linear shape. As the shape memory alloy thin wire material constituting the trunk thread 16, various conventionally known thin wire materials can be used. For example, Ni-
A Ti-based alloy can be used, and the ratio of each component can be selected and changed as appropriate depending on the setting of the transformation temperature. For example, when setting the transformation temperature (Af) higher than the water temperature as mentioned above, this can be achieved by setting the composition to Ni: 55.7% or less and Ti: the balance.
In addition, as a desirable embodiment, when the transformation temperature (Af) is set to, for example, 5 to 25°C so that the structure of the shape memory alloy in water becomes an austenite state, the ratio of Ni and Ti is 55.7 to 56.2%, Ti : The remainder (all percentages by weight). Alternatively, various other conventionally known types such as Co, Fe, V, Cr,
A shape memory alloy to which an appropriate amount of Mo or the like is added can be used. Incidentally, a conventionally known method can be used as a method for producing the thin wire rod of the shape memory alloy. For example, the wire diameter is reduced by cold working with an area reduction rate of 10% or more.
After 0.1mm, 350~550℃, preferably 400~
It can be manufactured by performing shape memory treatment at a temperature of 500°C. The trunk yarn 16 of the workpiece in this example floats in the water as a soft yarn, and behaves similar to the nylon yarns of the Harris yarns 18 and 20. On the other hand, the main thread 16 is stronger than nylon thread, so the Harris thread 18 is less likely to get entangled with the main thread 16, and even if it does get entangled, it can be pulled out of the water and heated to recover its shape, or it can be removed from the original water. Since it maintains a straight shape regardless of whether it is inside or outside (when it is in an austenitic state in water), the entangled Harris yarns 18 and 20 can be easily removed from the main yarn 16. In the fishing gear of this example, as shown in FIG.
It will be in a state where it protrudes laterally from 6. Therefore, it is easy to handle the Harris thread 18, and there is also an advantage that the operation when replacing the Harris thread 18 is easy. The shape of the hook in a fishing tackle varies depending on the type of fish, fishing method, etc., and the present invention can be applied to these various shapes of hooks.
FIG. 3 shows an example. In this example, trunk thread 2
A weight is connected to the tip of 4, and three Harris threads 28 are connected to the main thread 24. FIG. 4 shows an example of application to a body-mounted device. The main thread 30 made of shape memory alloy has a thickness of 0.2 mm.
Four Harris threads 31 are connected, and the Harris thread 31 is composed of a 0.14 mm shape memory alloy thread 32 and a nylon thread 33 connected to the tip thereof. FIG. 5 shows an example of application to a sabiki fishing hook, in which a pseudo burr is used for the fishing hook 44. still,
40 is a stem thread made of a shape memory alloy, and 41 is a Harris thread made of a thread 42 made of a shape memory alloy and a nylon thread 43. The present invention can also be applied to a device in which a balance is connected to the tip of the line, and a main line is further connected to the tip of the line, and can be used for sea fishing, river fishing, or rock fishing. It can be applied to fishing gear having various types of tackle, regardless of whether it is for fishing, boat fishing, cast fishing, etc. Further, if necessary, part or all of the thread can be made of a thin wire made of a shape memory alloy, or in some cases, the entire Harris yarn can be made of a thin wire made of a shape memory alloy. In addition, the present invention can be configured with various modifications without departing from the spirit thereof, such as the ability to use shape memory alloys in various structural states.

[Brief explanation of the drawing]

FIG. 1 is a front view of a main part of a fishing gear according to an embodiment of the present invention, and FIG. 2 is a front view of a main part showing a connection part to a Harris type trunk line in FIG. 1. FIGS. 3, 4, and 5 are front views of main parts of fishing gear according to other embodiments of the present invention. Figure 6 shows Ni-
FIG. 3 is a diagram showing the relationship between additive elements and shape recovery temperature in Ti-based alloys. 10...Michiito, 14...Working Department, 16,24,
30, 40... Trunk thread, 18, 20, 28, 31,
41... Harris thread.

Claims (1)

[Claims] 1. A fishing line characterized by being made of a fine wire material of a shape memory alloy. 2. The fishing line according to claim 1, wherein the thin wire material of the shape memory alloy has a linear shape memorized in advance. 3. A fishing tackle comprising a hook part connected to the tip of a fishing line, characterized in that at least the main line part of the hook part is made of a fine wire material of a shape memory alloy. 4. The fishing gear according to claim 3, wherein a part or the entirety of the Harris thread of the hook part is made of a thin wire material of a shape memory alloy.