JPH11289939A - Forged steel weight for fishing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight for fishing without polluting environment nor damaging fishes and shellfishes or seaweeds in the sea. SOLUTION: This forged steel weight for fishing 1 is a steel molded product obtained by forging a steel material. A forged steel weight 1 for surf-fishing has a pair of rotation-preventing wings 5 on the surface of a streamline shape having a round head part 11 and a forged steel weight 1 for a boat fishing has a rectification board on the surface. The forged steel weight 1 has an excellent surface layer and more rapidly sinks into the sea. Further, the forged steel weight 1 prevents twisting of the fishing line and improves a directional stability in the using.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fishing weight and, more particularly, to a forged steel weight for fishing that does not pollute the environment and is harmless to underwater fish and shellfish and seaweed.

[0002]

2. Description of the Related Art The recent fishing population in Japan is said to be 10 million, and is increasing every year. By the way, most fishing weights conventionally used for throw fishing and boat fishing are made of lead. In recent years, lead pollution has been regarded as a problem, and although the amount is still small and its application does not seem to be widespread, iron fishing weights made by special casting are also on sale. In general, a conventional lead weight for fishing uses the weight shown in FIGS. 5 and 6 as a throw weight.

[0005] The shape of the lead weight 30 shown in FIG.
0 is an “aubergine” -shaped weight in front view provided with a base 33 (see the plan view of FIG. 5A) at the upper end. The taper 37 is formed so as to gradually increase toward the distal end portion 31. The reason why the tip portion 31 is formed large is considered to speed up subsidence in the sea. Further, the shape of the lead weight 30 shown in FIG. 6 is a long rhombus with upper and lower ends formed in parallel in a front view (however, a circular shape in a plan view). In addition, 37 is a taper, and 39 is a fishing line insertion hole.

A conventional lead weight for fishing uses a weight as shown in FIGS. 7 and 8 as a weight for boat fishing. The shape of the lead weight 30 shown in FIG. 7 is such that, when viewed from the side (see the side view in FIG. 7B), a gentle taper 37 is formed from the base 33 side of the lead weight 30 to the other end, and then the side parallel portion. 40 is a flat slender shape weight. Note that the distal end portion 31 is formed in a round shape with a small radius. The shape of the lead weight 30 shown in FIG. 8 is substantially square in plan view (see the plan view of FIG. 8C), and the opposing side surfaces are tapered 37 (reference numeral 38 denotes a taper 37). Is a narrow tapered surface formed on both sides facing each other at a right angle to the surface.). It is considered that the tapered surface is formed so that the sea current can easily escape to the rear of the weight when the lead weight fastened to the fishing line is pulled by a ship.

[0005] In general throw fishing and boat fishing, three to three at a time
About 10 pieces lose lead weight due to thread breakage.
Current lead weights are very expensive, which is a painful expense for anglers. A lead weight has a large specific gravity and is excellent in corrosion resistance, but because of its softness, its shape is deformed when it hits rock or concrete. Since there is no strength, there is a possibility that the base may come off from the lead weight. Above all, the biggest problem with lead weights is that lead is toxic, causing lead harm to marine animals and plants such as fish and shellfish and seaweed.

In order to solve the problem of the lead weight, Japanese Patent Laid-Open No.
Japanese Patent No. -19359 proposes a fishing weight made of a Cu-Zn-Pb alloy which is free from environmental pollution and lead pollution. The proposed weight for fishing says, "The basic component is Cu,
It consists of Zn and Pb, and its component range is Cu: 48-6.
A fishing weight made of an alloy containing 8 wt%, Zn: 27 to 47 wt%, Pb: 8 wt% or less, and a total amount of Cu, Zn, and Pb of 80 wt% or more. ".

The proposed Cu-Zn-Pb
Regarding the shape of the fishing weight made of an alloy, in the description of the "detailed description of the invention" of the above-mentioned Japanese Patent Application Laid-Open No. H8-19359, the description with reference to the drawings is not made,
For convenience of description of the conventional technique, reference numerals are given to the drawings (see FIG. 9). Fishing weight 3 made of this Cu-Zn-Pb alloy
0 denotes a dorsal fin 32 having a predetermined thickness as shown in FIG.
Is formed on one side surface of the fishing weight 30 by casting in the direction of the base 33 in a direction continuous with the hill-shaped protrusion 35 formed at a position separated from the tip part 31 opposite to the base 33 by a predetermined distance toward the base 33. Have been.

In the description of the "detailed description of the invention" in the above-mentioned Japanese Patent Application Laid-Open No. 8-193359, "a fishing line is hung from the top of a ship using a weight having a dorsal fin 32, and the fishing line is moved by moving the ship. As a result of fishing while shedding, 3
If there is no 2, there is a problem that the fishing line twists due to the rotation of the weight, and there is a drawback that it is not able to follow the flow of the ship well due to the large resistance, and it flows in a direction different from the traveling direction of the ship without permission. With the back fin 32, the twisting of the fishing line was eliminated, and the boat flowed well and the direction became constant. It is explained. Reference numeral 37 denotes a taper formed on both side surfaces perpendicular to the dorsal fin 32 formed on the weight 30 (see a plan view in FIG. 9C), and 36 denotes a side parallel formed in the same direction as the dorsal fin 32. 9 (see the bottom view of FIG. 9D).

Next, Japanese Patent Application Laid-Open No. 62-269636 discloses "a fishing tackle comprising at least one selected from the group consisting of a magnetic hook, a fish-collecting bead, and a weight."
Is disclosed. And, Japanese Unexamined Patent Application Publication No.
No. 6, "Detailed Description of the Invention" states that "the fishing hook is made of iron alloy that has been used conventionally and is magnetic. The beads for collecting fish have a hole at the center. It is a small magnetized ring made of an iron alloy having the following. A fishing line is passed through this hole and attached above the fishing hook.
Magnetized iron alloy used for fishing. The shape and size of the weight can be the same as those conventionally used for fishing equipment. It is explained. However, in the description of JP-A-62-269636, a fishing hook,
`` Iron alloys '' used for fish collection beads and weights are only described as `` iron alloys '', and there is no explanation or suggestion about their steel type or chemical composition .

[0010]

The biggest problem with lead weights is that lead is toxic, causing lead damage to marine animals and plants such as fish and shellfish and seaweed. This lead damage may affect our humans who eat marine animals and plants. Lead weights for fishing are usually made by casting because lead has a relatively low melting point and excellent castability, but casting cavities are likely to occur in cast products, and there is a possibility that weight variation may occur. .
In addition, the casting had a rough surface skin (the inventor investigated the surface roughness of a commercially available lead weight, and found that the surface roughness was 9.84 μm in RA, R
(57.9 μm in MAX display and the surface skin was bad). Therefore, when hit by the ocean current, it is easily washed away by the ocean current.

In order to solve the problem of the lead weight, a Cu—Zn—
The fishing weight made of Pb alloy has a Pb content of 8 wt%.
Although it has been improved in the following points, it is considered that if left in the sea, as long as Pb is contained, the alloy will be decomposed over many months and lead to the risk of lead damage. Some improvement is expected. Regarding the shape of a conventional fishing weight, Japanese Patent Application Laid-Open No. H8-19359 states that "a conventional weight with a dorsal fin eliminates twisting of the fishing line, and also follows the flow of the boat well and the direction is constant. However, since it is very difficult to form a sharp edge portion in a cast product, there is still room for improvement in the shape of the dorsal fin. An object of the present invention is to provide a forged steel weight for fishing which has no pollution and has an improved shape. In the present invention, the “streamline shape” means a mold shape configured by a curve that minimizes the resistance of an air flow or an ocean current as much as generally used.

[0012]

The inventor of the present invention has conducted intensive studies on the material of the fishing weight which does not cause pollution and the optimum shape of the weight. As a result, the material of the fishing weight is "steel containing a trace amount of Pb". The present invention was conceived to apply stamping forging to the optimum shape forming of the weight, and made the present invention. That is, the steel forged weight for fishing of the present invention is a steel molded product obtained by forging a steel material by forging. Steel is ppm Pb
Since it contains only trace levels, even if the fishing line is cut and left together in the sea, it will oxidize and return to nature without causing pollution.

The forged steel weight for fishing according to the present invention has a round head at the other end, and the diameter of the circular cross section at the neck of the round head gradually increases toward the one end. It has a streamlined configuration that is small, and a pair of symmetrical forgings formed integrally with and opposed to the outer surface of a portion near one end in the axial direction from one end to the other end. It is characterized by having a prevention wing.

Further, the forged steel weight for fishing of the present invention has a round head at the other end, and the diameter of the circular cross section at the neck of the round head gradually increases toward the one end. It has a streamlined shape with a small configuration, and in the axial direction from the other end to the vicinity of the one end, it has one thin uniform flow straightening plate integrally forged on one side. Features.

Further, in the steel forged weight for fishing of the present invention, the steel material is carbon steel or alloy steel for machine structure. Further, the steel forged weight for fishing of the present invention is characterized in that the Pb content is 10 ppm or less by mass ratio. In addition, the forged steel fishing weight for fishing according to the present invention is characterized in that the surface roughness is RA 2.20 μm or less.

[0016]

Embodiments of the present invention will be described below. In the present invention, a steel material having a very small Pb content is used as a material for forging when producing a fishing weight that does not cause pollution. Stainless steel is used as the carbon steel for machine structural use and alloy steel in consideration of the forgeability, the availability of scrap and the low price, etc. for the steel material. As the alloy steel, Cr-Mo steel, Mn steel or the like can be applied in addition to the applied stainless steel. However, it is not economical because the price of scrap increases when the content of the alloy increases. In forging, in particular, the corners can be formed sharply and uniformly thin, so that the forged weight is advantageous because it can reduce resistance to air and seawater when used, and improves directional stability and the like. In the forging according to the embodiment of the present invention, hot stamping forging or cold stamping forging performed at normal temperature is applied.

In order to form the fishing weight of the present invention by stamping and forging, a round bar having a diameter of 20 to 80 mm of carbon steel or stainless steel for machine structure, which is applied as a forging material, is cut into predetermined dimensions and heated. The material is heated to 1150 to 1300 ° C. in a furnace (since the material surface is not oxidized, the forging formability and the function of the weight after fabrication are not affected at all. Next, the forging material is taken out of the heating furnace, placed on the lower die set in the forging machine in advance, and the upper die set at the tip of the forging machine piston is lowered (pneumatically operated). A forging machine is used) to apply pressure to the forging material to complete forging. Burrs generated during the forging process are trimmed. Finally, a shot blast is applied to clean the surface. Needless to say, a molding cavity in which a parting line is set according to the size, size, and shape of the weight to be manufactured is formed in advance in the upper and lower molds. As described above, in the case of hot stamping forging, the material is heated in advance before forging. On the other hand, when the stamping forging is performed in a cold state, a blackened oxide film does not occur on the formed surface because the material is not heated. The presence or absence of the oxide film does not cause a functional problem of the steel forged weight of the present invention. However, in consideration of formability, it is preferable to use a low carbon-containing carbon steel for a carbon steel and a low alloy steel for an alloy steel in consideration of formability as a material to be subjected to cold stamping and forging.

(Embodiment 1) FIG. 1 is a perspective view of a steel forged weight for fishing used for throw fishing according to the present invention. 2 is a front view (FIG. 2 (a)) and a side view (FIG.
(B)), plan view (FIG. 2 (c)), bottom view (FIG.
(D)). A forged steel fishing weight 1 used for throw fishing according to the present invention will be described with reference to FIGS. The forged steel weight 1 has a round head 11 at the other end 4, and the diameter of the circular cross section at the neck 12 of the round head 11 is determined by the one end 3.
, In a streamlined shape gradually reduced in diameter, in the axial direction (longitudinal direction) from one end 3 to the other end 4 side, integrally with the outer surface of a portion near the one end 3 and It has a pair of symmetrical anti-rotation wings 5 which are forged and opposed. The anti-rotation wing 5 has the same effect as the horizontal tail of the airplane, and thus has the effect of preventing rotation when the forged steel weight 1 is used.

According to the stamping forging, as shown in the bottom view (d) of FIG. 2, the anti-rotation wings 5 can be formed substantially perpendicularly to the outer surface and from the outer surface to a uniform thickness. The forged steel weight for fishing 1 used for throw fishing according to the present invention is streamlined and has anti-rotation wings 5 so that it has low air resistance and glides with good directional stability toward a target position where the angler wants to throw. can do. Further, since the tip portion 4 is formed thick, the tip portion 4 is hardly swept away by the ocean current and quickly sinks in the sea. In the process of forging, an oxide film was formed on the surface to give a black tint, and the surface skin was good. Also,
For collecting fish, it is possible to color the surface with paint or plating according to the difference of fish. In the measurement example of the surface roughness, RA
The display was 2.20 μm, and the RMAX display was 15.2 μm. The surface roughness of the forged steel weight is better when compared to the surface roughness RA of 9.84 μm and the RMAX display of 57.9 μm of the above-described lead weight casting. As a material for forging, carbon steel for machine structure (JIS symbol: S3
0C) and stainless steel (JIS symbol: SUS-3)
04) was applied. The Pb content of the forged material was 5 ppm or less.

(Embodiment 2) FIG. 3 is a perspective view of a steel forged weight for fishing used in boat fishing according to the present invention. Also,
4 is a front view (FIG. 4 (a)) and a side view (FIG.
(B)), plan view (FIG. 4 (c)), bottom view (FIG.
(D)). With reference to FIGS. 3 and 4, description will be made of a forged steel weight 6 for fishing used in boat fishing according to the present invention.
The forged steel weight 6 has a round head 13 at the other end 9, and the diameter of the circular cross section at the neck 14 of the round head 13 is gradually reduced toward the one end 8. In a streamlined shape, the axial direction (longitudinal direction) from the other end 9 to a part near the one end 8
In addition, there is provided a thin, uniform-thickness straightening plate 10 integrally formed on one side by forging.

According to the stamping forging, the current plate 10 can be formed to have a uniform thickness outward from the base portion with the outer surface. The forged fishing weight 6 for fishing used in the fishing of the present invention has a streamlined shape with low water resistance, and the rectifying plate 10 improves the rotation prevention of the forged steel weight 6 and also improves the directional stability. It has the effect of causing. For example, in terms of the size of the current plate 10 in relation to the steel forged weight for fishing 6 used for fishing of the boat of the present invention, from one end 8 on the base mounting side (the base is not shown). The axial center length of the other end 9 is 89.2.
When the end 8 is 9.22 mmφ, the thickness of the current plate 10 (see the side view in FIG. 4B) is forged to a thin thickness of 3.69 mm, which is difficult to obtain with a cast product. The maximum width of the current plate 10 is 28 mm as a vertical distance from the axis. Further, the rising parts 15 and 16 from the outer surface of the current plate 10 are such that the part 15 is at a position of 2 to 3 mm from the other end 9 and the part 16 is at a position of 18 mm from one end 8. In addition, the round head shape of the other end 9 is formed at 13.83 mmR. As described above, from the one end 8 to the other end 9, the straightening plate 10 having a thin and uniform thickness, which is difficult to obtain with a cast product of a lead weight, is formed by stamping and forging, thereby preventing rotation of the steel forged weight 6. This improves the directional stability.

In the process of hot forging, an oxide film is formed on the surface to give a black tint, but the surface is good. Also, for collecting fish, the surface can be colored by paint, plating, or the like according to the difference of fish. The measurement results of the surface roughness were almost the same as those in the first embodiment. In addition, carbon steel for machine structure (JIS code: S40C) and stainless steel (JIS code: S40) applied as forging materials
US-304) had a Pb content of 10 ppm or less.

[0023]

As described above, the steel forged weight of the present invention has the following effects. (A) Even if the forged steel weight falls to the seabed, it finally melts and returns to the natural world without pollution. (B) Since the forged steel weight has a streamlined shape, it sinks faster in the sea. The anti-rotation wings provided on the forged weight for casting fishing and the straightening plates provided on the forged weight for boat fishing prevent twisting of the fishing line and improve directional stability. (C) In the case of using the forged steel weight as it is, if it is washed with water after use and dried, a good surface skin can be maintained. (D) The color suitable for the fish can be coated. (E) It is possible to produce mass-produced products according to the standard by stamping and forging using carbon steel and alloy steel for machine structure generally produced by a steelmaking manufacturer.

[Brief description of the drawings]

FIG. 1 is a perspective view of a steel forged weight for fishing used for throw fishing according to the present invention.

2 (a) is a front view and FIG. 2 (b) relates to FIG. 1 of the present invention.
Is a side view, (c) is a plan view, and (d) is a bottom view.

FIG. 3 is a perspective view of a steel forged weight for fishing used for boat fishing according to the present invention.

4 (a) is a front view and FIG. 4 (b) relates to FIG. 3 of the present invention.
Is a side view, (c) is a plan view, and (d) is a bottom view.

5 (a) is a front view and FIG. 5 (c) is a plan view of the conventional lead fishing weight for throw fishing.

6 (a) is a front view and FIG. 6 (c) is a plan view of a conventional lead weight for throw fishing.

7 (a) is a front view and FIG. 7 (b) is a side view of a conventional lead weight for boat fishing.

8 (a) is a front view, FIG. 8 (b) is a side view, and FIG. 8 (c) is a plan view relating to a conventional lead weight for boat fishing.

FIG. 9 is a front view, FIG. 9B is a side view, FIG. 9C is a plan view, and FIG. 9D is a bottom view of a conventional fishing weight made of a Cu—Zn—Pb alloy.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 Forged steel weight for fishing used for throw fishing 2 Central part of forged steel weight for fishing used for throw fishing 3, 8 One end side on base 4, 9 The other end having round head shape 5 Anti-rotation wing 6 Forged steel weight for fishing used for boat fishing 7 Central part of forged steel weight for fishing used for boat fishing 10 Straightening plate 11 Round forged steel weight for fishing used for throw fishing Head 12 Neck of round head of steel forged weight for fishing used for throw fishing 13 Round head of steel forged weight for fishing used for boat fishing 14 Steel forging for fishing used for boat fishing Neck rectifying plate of round head of weight made of weight 15 Rising portion of rectifying plate at other end 16 Rising portion of rectifying plate at one end 30 Lead weight 31 Tip 32 Back fin 33 Cap 35 Hill-shaped protrusion 36 Side surface Parallel part 37 Taper 38 Small width taper surface 39 fishing line insertion hole 40 side parallel part

Claims (7)

[Claims] 1. A forged steel weight for fishing, which is a steel molded product formed by forging a steel material. 2. A streamline shape in which the other end has a round head and the diameter of the circular cross section at the neck of the round head gradually decreases toward the one end. A pair of symmetrical anti-rotation wings that are forged and formed integrally with and opposed to an outer surface of a portion near the one end in the axial direction from the one end to the other end. The forged steel weight for fishing according to claim 1. 3. A streamline shape having a round head at the other end, and a diameter of a circular cross section at a neck portion of the round head is gradually reduced toward the one end. 2. A thin, uniform-thickness rectifying plate integrally forged on one side in an axial direction from the other end to a portion near the one end. Forged steel weight for fishing. 4. The steel forged weight for fishing according to claim 1, wherein the steel material is carbon steel for machine structure. 5. The steel forged weight for fishing according to claim 1, wherein the steel material is an alloy steel. 6. The steel forged weight for fishing according to claim 4, wherein the Pb content is not more than 10 ppm in mass ratio. 7. The steel forged weight for fishing according to claim 1, wherein the surface roughness of the surface is RA 2.20 μm or less.