JP2005328701A - Sinker for fishing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sinker for fishing degradable with time without adversely affecting the natural world. <P>SOLUTION: This sinker for fishing is composed of a sinker part 10 formed by superimposing a plurality of thin sheets 11, 12 and 13 made of iron and each having a hole part formed in the central part thereof, a cylindrical member 20 made of a biodegradable resin and passing through the hole parts in the thin sheets 11, 12 and 13 and a biodegradable resin 30 covering the outer periphery of the sinker part 10. Each of the thin sheets 11, 12 and 13 composing the sinker part 10 is formed by pressing an iron plate having about 1-2 mm thickness thereof into a circular form in a doughnut shape. The surfaces of the thin sheets 11, 12 and 13 are composed so as to directly expose the surface of iron without carrying out plating or coating with the result that the surfaces of the thin sheets can readily be oxidized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fishing weight used in fishing and leisure fishing.

  As materials for such fishing weights, conventionally, lead and tin-lead alloys that are easy to process and relatively inexpensive have been used. However, the weight may be left in the water due to breakage of the thread, or may be unusable and left on the water or on the ground. In this way, the weight containing lead that is left in the natural world adversely affects living organisms and causes a problem of destroying nature. Therefore, it is preferable to limit the use of the weight containing lead from the viewpoint of nature protection.

For this reason, Patent Document 1 proposes a weight obtained by mixing a high specific gravity tungsten powder and a biodegradable resin.
JP2000-201606

  Since the weight disclosed in Patent Literature 1 uses biodegradable resin, it is eventually decomposed by microorganisms, but after the biodegradable resin is decomposed, tungsten powder is released to nature. Will be. Since tungsten does not decompose over time, it has a problem of adversely affecting the natural world.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a fishing weight that can be decomposed over time and does not adversely affect the natural world.

  The invention described in claim 1 is characterized in that the outer periphery of a weight portion formed by overlapping a plurality of thin iron plates is covered with a biodegradable resin.

  The invention according to claim 2 is a cylindrical part made of a biodegradable resin penetrating a weight part formed by superposing a plurality of iron thin plates each having a hole formed in the center thereof, and a hole in the thin plate. A member and a biodegradable resin covering the outer periphery of the weight portion are provided.

  According to the first and second aspects of the invention, since the outer periphery of the weight part is covered with the biodegradable resin, the weight part is exposed with decomposition over time. Since the weight portion is formed by overlapping a plurality of iron thin plates, the iron thin plates become iron oxide and decompose into fine particles in a relatively short time. For this reason, the entire weight is decomposed and collected in nature within a short time.

  In addition, according to the invention described in claim 2, since the cylindrical member made of biodegradable resin that penetrates the hole formed in the central portion of the thin plate is used, a plurality of thin plates are formed by the cylindrical member. Can be connected to each other, and even when a relatively small amount of biodegradable resin covering the outer periphery of the weight portion is used, a plurality of thin plates can be securely fixed. In addition, it is possible to easily connect the fishing weight to the fishing line using this cylindrical member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a fishing weight according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view showing the weight portion 10 and the cylindrical member 20.

  This fishing weight has a weight portion 10 formed by superposing a plurality of iron thin plates 11, 12, 13 having a hole portion formed in the center thereof, and a raw material penetrating through the hole portions in the thin plates 11, 12, 13. It consists of a cylindrical member 20 made of degradable resin and a biodegradable resin 30 covering the outer periphery of the weight portion 10.

  Each of the thin plates 11, 12, and 13 constituting the weight portion 10 is formed by pressing an iron plate having a thickness of about 1 to 2 mm in a circular donut shape. And the surface of this thin plate 11, 12, 13 is comprised so that the iron ground may appear as it is, without giving plating and coating so that it can oxidize easily.

  The cylindrical member 20 made of biodegradable resin has an outer diameter that is slightly smaller than the inner diameter of the holes formed in the thin plates 11, 12, and 13 constituting the weight portion 10. For this reason, when this cylindrical member 20 is penetrated through the hole in each thin plate 11, 12, 13 in a state where the thin plates 11, 12, 13 are superposed, each thin plate 11 is caused by the action of this cylindrical member 20. , 12 and 13 can be prevented from falling apart.

  As the biodegradable resin 30 that covers the outer periphery of the weight portion 10, various biodegradable resins such as microbial production systems, natural polymer systems, and chemical synthesis systems can be used. As the biodegradable resin 30, a completely biodegradable resin that is finally decomposed into water and carbon dioxide is used. In addition, as this biodegradable resin 30, the thing of the same material as the cylindrical member 20 may be used, and the thing of a different material may be used.

  Next, a manufacturing process for manufacturing the fishing weight will be described. In the following description, a case where Bionore (trade name), which is a chemically synthesized biodegradable resin manufactured by Showa Polymer Co., Ltd., is used as the biodegradable resin 30 will be described.

  When manufacturing this fishing weight, first, the four thin plates 13 having the largest outer diameter are centered, and the four thin plates 12 having the next largest outer diameters are arranged on both sides thereof. In the state in which each of the four thin plates 11 having the smallest outer diameter is disposed, the tubular member 20 is passed through the holes in the thin plates 11, 12, and 13. Then, the thin plates 11, 12, 13 and the cylindrical member 20 in this state are installed in a mold. At this time, it is preferable to keep the temperature of the mold at 10 to 40 degrees Celsius.

  In addition, for the purpose of removing moisture, the pellet-shaped biodegradable resin is previously dried. This drying is preferably performed at a drying temperature of about 80 degrees Celsius for 3 hours or more. And the biodegradable resin after drying is inject | poured in the metal mold | die which installed the thin plates 11, 12, 13 and the cylindrical member 20 with the injection molding machine. The injection pressure at this time is, for example, 450 to 800 kilograms per square centimeter.

  The fishing weight thus created has a configuration in which the thin plates 11, 12, and 13 are connected by the cylindrical member 20 and the outer peripheral portion of the weight portion 10 is coated with a relatively thin film-like biodegradable resin 30. Have That is, this fishing weight has a configuration in which the tubular member 20 passes through the hole formed in the central part of the thin plates 11, 12, 13, and thus the biodegradable resin 30 that covers the outer periphery of the weight part 10 is used. Even when the amount is relatively small, the plurality of thin plates 11, 12, 13 can be securely fixed.

  When using this fishing weight, as shown in FIG. 1, a pair of salcans (returns) 91 may be connected to both ends of a fishing line 92 that has passed through the tubular member 20.

  Since the weight portion 10 of the fishing weight is covered with the biodegradable resin 30, the iron thin plates 11, 12, and 13 do not rust. When the fishing weight is left in the water or the like, the biodegradable resin 30 and the cylindrical member 20 are first decomposed into water and carbon dioxide. Then, the iron thin plates 11, 12, 13 are oxidized and decomposed into fine particles. Iron is a substance that naturally exists in nature and is harmless to ecosystems when released into the natural environment.

  At this time, in this fishing weight, the weight portion 10 is formed by superimposing a plurality of iron thin plates 11, 12, and 13, so that the iron thin plate is used compared to the case of using a single weight. It becomes iron oxide and decomposes into fine particles in an extremely short time. For this reason, the entire weight is decomposed and collected in nature within a short time.

  In the above-described embodiment, a pair of salcans (returns) 91 are coupled to both ends of the fishing line 92 that has passed through the tubular member 20, and the salcan 91 is coupled to a fishing line connected to a fishing rod or fishing hook. Like to do. However, you may employ | adopt the structure which fixes this salcan 91 with respect to the weight for fishing by embedding a part of salcan 91 with respect to the cylindrical member 20 or the biodegradable resin 30. FIG. Further, instead of the salcan 91, a connecting member with another fishing line can be fixed to the tubular member 20 or the biodegradable resin 30 in an embedded manner.

  In this case, it is preferable to use iron as the material of the connecting member to the salcan 91 or the fishing line. However, brass or the like may be used as the material. Even in this case, it is possible to minimize adverse effects on the natural world as compared with the case where lead or the like is used for the weight body.

  Next, another embodiment of the present invention will be described. FIG. 3 is a longitudinal sectional view of a fishing weight according to a second embodiment of the present invention, and FIG. 4 is an exploded perspective view showing the weight portion 10, the cylindrical member 20, and the split pin 40. As shown in FIG.

  The fishing weight according to the first embodiment described above is mainly used for quay fishing, carp fishing, etc., but the fishing weight according to the second embodiment is used for boat fishing etc. It has become.

  This fishing weight superimposes six thin plates 13 with the largest outer diameter, seven thin plates 12 with the next largest outer diameter, and four thin plates 11 with the smallest outer diameter in this order, The holes in each of the thin plates 11, 12, 13 are penetrated by a cylindrical member 20 made of biodegradable resin, and a split pin 40 is arranged in the cylindrical member 20.

  As the split pin 40, it is preferable to use an iron one from the viewpoint of environmental protection. A thin film of biodegradable resin may be formed on the surface of the split pin 40. The outer diameter of the head 41 in the split pin 40 is larger than the inner diameter of the cylindrical member 20 and smaller than the inner diameter of the hole formed in each thin plate 11, 12, 13.

  When manufacturing this fishing weight, as shown in FIG. 4, the tubular member 20 is passed through the holes in the thin plates 11, 12, 13, and the split pin 40 is inserted into the tubular member 20. To penetrate. Then, as shown in FIG. 3, the thin plates 11, 12, 13 and the tubular member 20 are fixed by the split pin 40 by bending the tip of the split pin 40.

  Then, the thin plates 11, 12, 13, the cylindrical member 20 and the split pin 40 in this state are installed in a mold. Thereafter, a coating of the biodegradable resin 30 is formed by the same process as in the first embodiment described above.

  When using this fishing weight, a fishing line may be connected to the head 41 of the split pin 40.

  Since the weight portion 10 of this fishing weight is also covered with the biodegradable resin 30, the iron thin plates 11, 12, and 13 do not rust. When the fishing weight is left in the water or the like, the biodegradable resin 30 and the cylindrical member 20 are first decomposed into water and carbon dioxide. Then, the iron thin plates 11, 12, 13 and the split pin 40 are oxidized and decomposed into fine particles.

  At this time, since the outer diameter of the head 41 of the split pin 40 is smaller than the inner diameter of the hole formed in each of the thin plates 11, 12, 13, the split member 40 is split after the tubular member 20 is disassembled. The pin 40 is detached from each thin plate 11, 12, 13. For this reason, since the thin plates 11, 12, and 13 in the superposed body are separated, the iron thin plate becomes iron oxide and decomposes into fine particles in an extremely short time as in the case of the first embodiment.

  In the embodiment described above, the thin plates 11, 12, and 13 each have a circular outer diameter, but a polygonal outer diameter may be used.

  In the above-described embodiment, all of the three types of thin plates 11, 12, and 13 having different outer diameters are used. However, thin plates having the same diameter may be used.

It is a longitudinal cross-sectional view of the fishing weight which concerns on 1st Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the weight part 10 and the cylindrical member 20 of the weight for fishing which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the fishing weight which concerns on 2nd Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the weight part 10, the cylindrical member 20, and the split pin 40 of the weight for fishing which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Weight part 11 Thin plate 12 Thin plate 13 Thin plate 20 Cylindrical member 30 Biodegradable resin 40 Split pin 41 Head

Claims (2)

  A fishing weight characterized in that the outer periphery of a weight portion formed by superposing a plurality of thin iron plates is covered with a biodegradable resin. A weight part formed by superposing a plurality of thin iron plates each having a hole formed in the central part thereof,
A cylindrical member made of biodegradable resin that penetrates the hole in the thin plate,
A biodegradable resin covering the outer periphery of the weight part;
A fishing weight characterized by comprising:

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