Lure

Abstract

To provide a lure that can be provided inexpensively and can reduce a load to a marine environment.SOLUTION: A lure 1 includes: a skeleton body 2 made of a magnesium alloy; and a pair of trunk plates 3, 4 made of a magnesium alloy and provided so as to sandwich the skeleton body 2. One trunk plate 3 and the skeleton body 2 are welded by laser welding, the other trunk plate 4 and the skeleton body 2 are welded by laser welding, and a surface corrosion resistant layer 5 is provided on an outer surface. It is preferable that a content of magnesium in the lure 1 is 89 mass% to 99 mass%.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a lure used in fishing. [Background technology]

[0002] Conventionally, lures made of synthetic resin have been known as lures used in fishing. Patent Document 1 discloses such a synthetic resin lure, which has a metal frame along the lure's periphery, a weight fixed to the head side of the metal frame, and a synthetic resin body with the metal frame and weight embedded in it, in order to provide high strength and prevent breakage even when colliding with an obstacle. Patent Documents 2-4 also disclose techniques related to the surface treatment of magnesium alloys. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-176884 [Patent Document 2] Japanese Patent Application Publication No. 7-126858 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-146391 [Patent Document 4] Japanese Patent Application Laid-Open No. 2013-189660 Summary of the Invention [Problem to be solved by the invention]

[0004] However, due to the recent worsening of the marine microplastic problem, there is an urgent need to make lures made from materials that are considerate of the marine environment. In order to reduce the burden on the marine environment, it is possible to form lures using biodegradable plastics instead of conventional synthetic resins, but biodegradable plastics are still expensive, which creates the problem of high lure manufacturing costs. Therefore, there is a demand for lures that are inexpensive and can reduce the burden on the marine environment.

[0005] The present invention has been proposed in view of the above problems, and aims to provide a lure that can be provided at low cost and that can reduce the burden on the marine environment. [Means for solving the problem]

[0006] The lure of the present invention comprises a magnesium alloy skeleton and a pair of magnesium alloy body plates arranged to sandwich the skeleton, one of the body plates being welded to the skeleton and the other body plate being welded to the skeleton, and a surface corrosion-resistant layer being provided on the outer surface. According to this, by constructing a lure with a frame made of an inexpensive magnesium alloy and a pair of body plates made of an inexpensive magnesium alloy, it is possible to provide an inexpensive lure with low manufacturing costs. Furthermore, since the magnesium in the magnesium alloy dissolves in seawater over time and becomes a component of seawater, it can reduce the burden on the marine environment, unlike lures made of synthetic resin. Furthermore, since the magnesium alloy is lightweight, with a weight similar to that of plastic, it can ensure good usability when casting and reeling. Furthermore, by providing a surface corrosion-resistant layer on the outer surface, seawater corrosion can be suppressed, ensuring the corrosion resistance required for the lure.

[0007] The lure of the present invention is characterized in that one of the body plates and the skeleton is laser welded, and the other body plate and the skeleton is laser welded. This allows one fuselage plate and the frame, and the other fuselage plate and the frame, to be accurately welded over a necessary, sufficient, and appropriate welding range. Furthermore, laser welding reduces heat input during welding, preventing thermal deformation between one fuselage plate and the other fuselage plate and the frame during welding.

[0008] The lure of the present invention is characterized in that the magnesium content is 89% to 99% by mass. This allows most of the lure to dissolve in seawater over time, significantly reducing the burden on the marine environment.

[0009] The lure of the present invention is characterized in that slots are formed in both of the body plates, the insertion portion of the skeleton is inserted into the slot so as to protrude outward, and the insertion portion and the periphery of the slot are welded together. With this, even if there is a difference in the height of the peripheral edge of the slot, by welding so as to melt the protruding part of the insertion part of the skeleton, it is possible to form a good weld without creating a gap around the slot. Also, by inserting the insertion part into the slot, it is possible to easily align one fuselage plate and the skeleton, and the other fuselage plate and the skeleton, prior to the welding work.

[0010] The lure of the present invention is characterized in that the plurality of skeletal members constituting the skeletal body, the one body plate and the other body plate are press-molded materials. This allows the multiple skeletal materials that make up the skeleton, one body plate, and the other body plate to be manufactured inexpensively with high manufacturing efficiency, thereby improving the manufacturing efficiency of the lure and reducing manufacturing costs.

[0011] The lure of the present invention is characterized in that the skeletal body comprises an upper skeletal plate and a lower skeletal plate that are arranged opposite each other with a gap between them in the vertical direction, the upper skeletal plate and the lower skeletal plate are formed in a roughly elliptical shape with the longitudinal direction being the fore-and-aft direction of the lure, the one body plate and the other body plate are arranged on the left and right sides of the upper skeletal plate and the lower skeletal plate, a part of the periphery of the upper skeletal plate arranged on the one body plate side and a part of the periphery of the lower skeletal plate that are arranged on the other body plate side are welded to the one body plate, and a part of the periphery of the upper skeletal plate and a part of the periphery of the lower skeletal plate that are arranged on the other body plate side are welded to the other body plate. According to this, the skeleton body can be constructed only from an upper skeleton plate and a lower skeleton plate, which reduces the number of parts, reduces assembly work, and reduces manufacturing costs. Also, unlike lures that have a hollow space containing air inside, the lure weight can be adjusted to a desired value simply by adjusting the weight of the upper skeleton plate, the lower skeleton plate, and both body plates, making it easy to set the lure weight. Furthermore, since there is no hollow space inside and the structure can tolerate gaps in the welded joints, the tolerance for processing accuracy can be expanded, and yield can be improved. [Effects of the Invention]

[0012] The lure of the present invention can be provided at low cost and can reduce the burden on the marine environment. [Brief explanation of the drawings]

[0013] [Figure 1] 1A is a perspective view of a lure according to a first embodiment of the present invention, FIG. 1B is an enlarged front view thereof, and FIG. 1C is a side view thereof. [Figure 2] 1(a) is an enlarged explanatory view of the end face of AA in FIG. 1(c), and FIG. 1(b) is an exploded perspective view of the lure of the first embodiment. [Figure 3] FIG. 2 is a schematic explanatory diagram illustrating welding of the insertion portion of the skeleton body and the periphery of the slot of the body plate in the lure of the first embodiment. [Figure 4] 1A is a perspective view of a lure according to a second embodiment of the present invention, FIG. 1B is an enlarged front view thereof, and FIG. 1C is a side view thereof. [Figure 5] 4(c) BB enlarged end view, (b) is an exploded perspective view of the lure of the second embodiment. FIG. [Figure 6] 1A is a perspective view of a lure according to a third embodiment of the present invention, FIG. 1B is an enlarged front view thereof, and FIG. 1C is a side view thereof. [Figure 7] 6(a) is an enlarged end view of CC in FIG. 6(c), and FIG. 6(b) is an exploded perspective view of the lure of the third embodiment. [Figure 8] 1A is a perspective view of a lure according to a fourth embodiment of the present invention, FIG. 1B is an enlarged front view thereof, and FIG. 1C is a side view thereof. [Figure 9] 8(c) and 8(b) are exploded perspective views of the lure of the fourth embodiment. [Figure 10] 1(a) is a perspective view of a lure according to a fifth embodiment of the present invention, FIG. 1(b) is an enlarged front view thereof, and FIG. 1(c) is a side view thereof. [Figure 11] 10(a) is an enlarged end view of the EE in FIG. 10(c), and FIG. 10(b) is an exploded perspective view of the lure of the fifth embodiment. [Figure 12] 1(a) is a perspective view of a lure according to a sixth embodiment of the present invention, FIG. 1(b) is an enlarged front view thereof, and FIG. 1(c) is a side view thereof. [Figure 13] Enlarged end view of FF in Figure 12(c) [Figure 14] FIG. 10 is an exploded perspective view of a lure according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] [Lure of the first embodiment] 1 and 2, a lure 1 according to a first embodiment of the present invention comprises a magnesium alloy skeleton 2 and a pair of magnesium alloy body plates 3, 4 disposed so as to sandwich the skeleton 2, and is configured by welding one body plate 3 to the skeleton 2 and welding the other body plate 4 to the skeleton 2. A surface corrosion-resistant layer 5 is provided on the outer surface of the lure 1, and in the first embodiment, the surface corrosion-resistant layer 5 is provided on the outer surface of the lure 1 constituted by one body plate 3 and the other body plate 4.

[0015] The skeleton 2 in the first embodiment is fish-shaped in side view and is composed of a plate-like spinal plate 21 extending longitudinally from front to back, and multiple rib plates 22. The spinal plate 21 and the multiple rib plates 22 each correspond to the skeletal materials that make up the skeleton 2. Slits are formed in each rib plate 22, and the rib plates 22 are attached to the spinal plate 21 by fitting the slits in each rib plate 22 into slits 211 formed at intervals in the longitudinal direction on the underside of the spinal plate 21. Each rib plate 22 is fitted into the spinal plate 21 or fixed to the spinal plate 21 by welding around the slits 211.

[0016] The backbone plate 21 and each rib plate 22 are each made of press-formed material, but it is also possible to use a skeletal material other than press-formed material for either or both of the backbone plate 21 and each rib plate 22. The backbone plate 21 and each rib plate 22 are each made of a magnesium alloy, preferably AZ10A, AZ31B, or AZ31C, an Mg-Al-Zn alloy that has excellent ductility and weldability during press forming.

[0017] One fuselage plate 3 and the other fuselage plate 4 are each a curved shell-shaped plate made of a magnesium alloy, preferably an Mg-Al-Zn alloy such as AZ10A, AZ31B, or AZ31C, which has excellent ductility and weldability during press forming. One fuselage plate 3 and the other fuselage plate 4 are also made of press-formed material, but materials other than press-formed materials can also be used.

[0018] In lure 1, which is composed of a magnesium alloy skeleton 2 and a pair of magnesium alloy body plates 3 and 4, the magnesium content of lure 1 as a whole is preferably 89% to 99% by mass, and more preferably 94% to 99% by mass, from the viewpoint of dissolving most of lure 1 in seawater and returning it to the sea, thereby significantly reducing the burden on the marine environment.

[0019] Slots 31, 41 are formed in one fuselage plate 3 and the other fuselage plate 4, which are arranged on both the left and right sides of the skeleton 2, at positions corresponding to the rib plates 22 and spaced apart in the longitudinal direction of the skeleton 2. Furthermore, the rib plates 22 of the skeleton 2 are formed with convex insertion portions 221 that protrude locally in the surface direction of the rib plate 22. In the first embodiment, the insertion portions 221 are formed in two positions on each of the left and right sides of the rib plate 22, spaced apart above and below. The insertion portions 221 are engaged with the slots 31 in one fuselage plate 3 and the slots 41 in the other fuselage plate 4, respectively, and are inserted so as to protrude outside the slots 31 in the one fuselage plate 3 and the slots 41 in the other fuselage plate 4, respectively.

[0020] The insertion portion 221 of the skeleton 2 and the periphery of the slot 31 of one of the fuselage plates 3 are welded at a weld 61, and the insertion portion 221 of the skeleton 2 and the periphery of the slot 41 of the other fuselage plate 4 are also welded at a weld 61 (see FIG. 3). The weld 61 is preferably a weld made by laser welding, but can be a weld made by any appropriate welding method within the applicable range, and can also be a weld made by TIG welding, for example.

[0021] The entire periphery of one fuselage plate 3 is welded to the backbone plate 21 of the skeleton 2 at welds 62, and the entire periphery of the other fuselage plate 4 is also welded to the backbone plate 21 of the skeleton 2 at welds 62, so that the skeleton 2, one fuselage plate 3, and the other fuselage plate 4 are joined together and integrated. The welds 62 are preferably welded by laser welding, but can also be welded by any appropriate welding method within the applicable range, such as TIG welding.

[0022] In the lure 1 of the first embodiment, a hollow portion is formed between the spine plate 21 of the skeletal body 2 and one of the body plates 3 by welding at the welded portion 62 between the spine plate 21 and one of the body plates 3, and a hollow portion is formed between the spine plate 21 of the skeletal body 2 and the other body plate 4 by welding at the welded portion 62 between the spine plate 21 and the other body plate 4.

[0023] The surface corrosion-resistant layer 5 may be any suitable layer as long as it provides the corrosion resistance and rust prevention against seawater corrosion required of lure products. For example, it may be a chemical conversion coating layer containing a phosphorus-manganese compound and a manganese-nitrogen compound formed on the outer surface of a component by contacting the component with an aqueous chemical conversion treatment solution containing phosphoric acid, manganese ions, and an amine compound and having a pH of 2.0 to 5.0, as disclosed in Patent Document 2; an anodic oxide coating as disclosed in Patent Document 3; a corrosion-resistant plating layer such as an aluminum plating layer as disclosed in Patent Document 4; or a surface corrosion-resistant layer formed by known painting. Furthermore, the mass percentage of the entire surface corrosion-resistant layer 5 relative to the lure 1 is preferably about 1 to 2%, and this also applies to the second to fifth embodiments described below.

[0024] The lure 1 is provided with a hook attachment portion 71 to which a hook 73 is attached, and also with a fishing line attachment portion 72 to which a fishing line is attached. The configurations of the hook attachment portion 71, fishing line attachment portion 72, and hook 73 may be any appropriate configuration within the scope of the present invention.

[0025] According to the lure 1 of the first embodiment, the lure 1 is constructed with a frame 2 made of an inexpensive magnesium alloy and a pair of body plates 3, 4 made of an inexpensive magnesium alloy, thereby providing an inexpensive lure 1 with low manufacturing costs. Furthermore, the magnesium in the magnesium alloy dissolves in seawater over time and becomes a component of seawater, which reduces the burden on the marine environment compared to lures made of synthetic resin. Furthermore, because the magnesium alloy is lightweight, with a weight similar to that of plastic, it ensures a comfortable feel when casting and reeling in the lure. Furthermore, by providing a surface corrosion-resistant layer 5 on the outer surface, seawater corrosion is suppressed, ensuring the corrosion resistance required for the lure 1.

[0026] When laser welding is used to weld one fuselage plate 3 to the skeleton 2 and the other fuselage plate 4 to the skeleton 2, it is possible to accurately weld one fuselage plate 3 to the skeleton 2 and the other fuselage plate 4 to the skeleton 3 in a necessary and sufficient appropriate welding range. Furthermore, laser welding reduces heat input during welding, and can suppress thermal deformation of one fuselage plate 3, the other fuselage plate 4, and the skeleton 2 during welding.

[0027] Furthermore, by forming slots 31, 41 in both fuselage plates 3, 4, and inserting inserting portions 221 formed at multiple locations on the framework 2 into the slots 31, 41 so as to protrude outward, and welding the inserting portions 221 to the peripheries of the slots 31, 41, even if there is a misalignment G1 due to a difference in the height of the periphery of the slot 31 or the periphery of the slot 41, or even if there is a gap G2 between the inserting portions 221 and the slots 31, 41, by welding so as to melt the protruding portions P1 of the inserting portions 221 of the framework 2, a good weld 61 can be formed without any gaps around the slots (see FIG. 3 ). Furthermore, by inserting the inserting portions 221 into the slots 31, 41, it is possible to easily align one fuselage plate 3 and the framework 2, and the other fuselage plate 4 and the framework 2, prior to the welding operation.

[0028] Furthermore, by using press-molded materials for the spine plate 21 and the rib plates 22, which correspond to the multiple skeletal materials that make up the skeletal body 2, and the one body plate 3 and the other body plate 4, the multiple skeletal materials that make up the skeletal body 2, the one body plate 3 and the other body plate 4 can be manufactured inexpensively with high manufacturing efficiency, thereby improving the manufacturing efficiency of the lure 1 and reducing manufacturing costs.

[0029] Furthermore, in the lure 1 of the first embodiment, by welding one body plate 3 and the other body plate 4 to the spine plate 21 extending in the longitudinal direction from front to back, it is possible to suppress the occurrence of welding distortion in the longitudinal direction of the lure 1. Furthermore, by arranging a plurality of rib plates 22 spaced apart in the longitudinal direction laterally to support one body plate 3 and the other body plate 4, and welding each rib plate 22 to one body plate 3 and the other body plate 4, it is possible to suppress the occurrence of welding distortion in the lateral direction. Therefore, it is possible to manufacture the lure 1 without using a welding jig that suppresses welding distortion.

[0030] [Lure of Second Embodiment] 4 and 5, a lure 1a according to a second embodiment of the present invention comprises a magnesium alloy skeleton 2a and a pair of magnesium alloy body plates 3a and 4a sandwiching the skeleton 2a, with one body plate 3a welded to the skeleton 2a and the other body plate 4a welded to the skeleton 2a. The lure 1a is provided on its outer surface with a corrosion-resistant surface layer 5, and in the second embodiment, the lure 1a is also provided on its outer surface with the one body plate 3a and the other body plate 4a. The basic configurations of the corrosion-resistant surface layer 5, hook attachment portion 71, fishing line attachment portion 72, and hook 73 in the second embodiment are the same as those in the first embodiment, but the hook attachment portion 71 and fishing line attachment portion 72 are provided on the other body plate 4a.

[0031] The skeleton 2a in the second embodiment is composed of a spinal plate 21a, which is generally rectangular in plan view and extends longitudinally from front to back, and multiple rib plates 22a. The spinal plate 21a and the multiple rib plates 22a each correspond to the skeletal materials that make up the skeleton 2a. Each rib plate 22a has a slit formed therein, and is attached to the spinal plate 21a by fitting the slit into a slit 211a formed on either the left or right side of the spinal plate 21a and spaced apart in the longitudinal direction. Each rib plate 22a is fitted into the spinal plate 21a or fixed to the spinal plate 21a by welding around the slit 211a.

[0032] Although the backbone plate 21a and each of the rib plates 22a are each made of press-formed material, it is also possible to use a skeletal material other than press-formed material for either or both of the backbone plate 21a and each of the rib plates 22a. Furthermore, the backbone plate 21a and each of the rib plates 22a are each made of a magnesium alloy, preferably AZ10A, AZ31B, or AZ31C, an Mg-Al-Zn alloy that has excellent ductility and weldability during press forming.

[0033] One fuselage plate 3a and the other fuselage plate 4a are each a shell-shaped curved plate made of a magnesium alloy, preferably an Mg-Al-Zn alloy such as AZ10A, AZ31B, or AZ31C, which has excellent ductility and weldability during press forming. One fuselage plate 3a and the other fuselage plate 4a are also made of press-formed material, but materials other than press-formed material can also be used.

[0034] In lure 1a, which is composed of magnesium alloy skeleton 2a and a pair of magnesium alloy body plates 3a, 4a, the magnesium content of lure 1a as a whole is preferably 89% to 99% by mass, and more preferably 94% to 99% by mass, from the viewpoint of dissolving most of lure 1a in seawater and returning it to the sea, thereby significantly reducing the burden on the marine environment.

[0035] Slots 31a and 41a are formed in one fuselage plate 3a and the other fuselage plate 4a, which are arranged on both the left and right sides of the skeleton 2a, at positions corresponding to the rib plates 22a and spaced apart in the longitudinal direction of the skeleton 2a. The rib plates 22a of the skeleton 2a are also formed with convex insertion portions 221a that protrude locally along the surface of the rib plate 22a. In the second embodiment, the insertion portions 221a are formed at two positions on each of the left and right sides of the rib plate 22a, spaced apart vertically. The insertion portions 221a are engaged with the slots 31a in one fuselage plate 3a and the slots 41a in the other fuselage plate 4a, respectively, and are inserted so as to protrude outside the slots 31a in the one fuselage plate 3a and the slots 41a in the other fuselage plate 4a.

[0036] The insertion portion 221a of the skeleton 2a and the periphery of the slot 31a of one of the body plates 3a are welded at a weld 61a, and the insertion portion 221a of the skeleton 2a and the periphery of the slot 41a of the other body plate 4a are also welded at a weld 61a. The configuration of the weld 61a is the same as the weld 61 in the first embodiment, and is preferably formed by laser welding, for example, but can be formed by any appropriate welding method within an applicable range, such as TIG welding.

[0037] One body plate 3a and the other body plate 4a, which are arranged on the left and right sides of the skeleton 2a, have slots 32a, 42a extending in the longitudinal direction of the skeleton 2a at positions corresponding to the spine plate 21a in the longitudinal direction of the skeleton 2a. The left and right side ends of the spine plate 21a serve as insertion portions that engage with the slot 32a of one body plate 3a and the slot 42a of the other body plate 4a, respectively, and protrude outside the slot 32a of one body plate 3a and the slot 42a of the other body plate 4a, respectively. Furthermore, at the position where the rib plate 22a of the skeleton 2a is arranged, a portion of the rib plate 22a, instead of the side end of the spine plate 21a, serves as an insertion portion that protrudes outside the slot 42a of the body plate 4a.

[0038] One side end of backbone plate 21a, which corresponds to the insertion portion of skeleton 2a, is welded to the periphery of slot 32a in one fuselage plate 3a at weld 63a, the other side end of backbone plate 21a, which corresponds to the insertion portion of skeleton 2a, is welded to the periphery of slot 42a in the other fuselage plate 4a, and a part of rib plate 22a at the position where rib plate 22a is arranged is welded to the periphery of slot 42a in the other fuselage plate 4a at weld 63a. Weld 63a is preferably welded by laser welding, for example, but can be welded by any appropriate welding method within the applicable range, such as TIG welding.

[0039] The periphery of one fuselage plate 3a and the periphery of the other fuselage plate 4a are engaged with each other around the entire periphery and welded together at a weld 64a along the entire periphery of the engaged periphery. The weld 64a is preferably formed by laser welding, but can be formed by any suitable welding method within the applicable range, such as TIG welding. A hollow space is then formed between the one fuselage plate 3a and the other fuselage plate 4a.

[0040] The lure 1a of the second embodiment has a configuration corresponding to that of the lure 1 of the first embodiment, and therefore has corresponding effects. Furthermore, in the first embodiment, it is necessary to perform two welding laps along the periphery of the body plate, that is, welding the periphery of one body plate 3 to the backbone plate 21 and welding the periphery of the other body plate 4 to the backbone plate 21, whereas in the lure 1a of the second embodiment, it is sufficient to perform only one welding lap along the periphery of the body plate at the engagement point between the periphery of one body plate 3a and the periphery of the other body plate 4a. In other words, the lure 1a of the second embodiment can shorten the weld length, and the manufacturing process can be made more efficient.

[0041] [Lure of the third embodiment] As shown in Figures 6 and 7, a fishing lure 1b according to a third embodiment of the present invention comprises a magnesium alloy skeleton 2b and a pair of magnesium alloy body plates 3b and 4b sandwiching the skeleton 2b, with one body plate 3b welded to the skeleton 2b and the other body plate 4b welded to the skeleton 2b. A surface corrosion-resistant layer 5 is provided on the outer surface of the fishing lure 1b, and in the second embodiment, the surface corrosion-resistant layer 5 is also provided on the outer surface of the fishing lure 1b composed of one body plate 3b and the other body plate 4b. The configurations of the surface corrosion-resistant layer 5, hook attachment portion 71, fishing line attachment portion 72, and hook 73 in the third embodiment are the same as those in the first embodiment.

[0042] The skeleton 2b in the second embodiment is composed of a spine plate 21b with the same configuration as the spine plate 21a in the second embodiment, which has slits 211b, and multiple rib plates 22b. The spine plate 21b and the multiple rib plates 22b each correspond to the skeleton members that make up the skeleton 2b. The rib plates 22b are formed with protruding insertion portions 221b that protrude locally in the surface direction of the rib plate 22b. In the third embodiment, the insertion portions 221b are formed in two locations, one above and one below, on the left side of the rib plate 22b and one location on the right side. The remaining configurations of the skeleton 2b, spine plate 21b, and rib plate 22b are the same as those of the skeleton 2a, spine plate 21a, and rib plate 22a in the second embodiment.

[0043] One fuselage plate 3b and the other fuselage plate 4b, located on both the left and right sides of the skeleton 2b, have slots 31b, 41b formed at positions spaced apart in the longitudinal direction of the skeleton 2b and corresponding to the rib plates 22b. The slots 31b in one fuselage plate 3b are connected in a vertical series corresponding to the two upper and lower insertion portions 221b on the left side and the spine plate 221b sandwiched between them, which are connected in a vertical series. The slots 41b in the other fuselage plate 4b are connected in a vertical series corresponding to the upper and lower insertion portions 221b on the right side of the rib plate 22b. The other configurations of the one fuselage plate 3b and the other fuselage plate 4b are similar to the one fuselage plate 3a and the other fuselage plate 4a of the second embodiment.

[0044] The two upper and lower insertion portions 221b on the left side formed on the rib plate 22b of the skeleton 2b and the upper and lower continuous insertion portion of the spine plate 221b sandwiched between them engage with the slots 31b of one of the body plates 3b and are inserted so as to protrude outside the slots 31b of one of the body plates 3b. The upper and lower continuous insertion portions 221b on the right side formed on the rib plate 22b of the skeleton 2b engage with the slots 41b of the other body plate 4b and are inserted so as to protrude outside the slots 41b of the other body plate 4b.

[0045] The insertion portions 221b on the left side of the skeleton 2b and the backbone plates 221b sandwiched therebetween, which are connected vertically, are welded to the periphery of the slot 31b of one of the body plates 3b by welds 61b so as to fit along the periphery of the vertically continuous slot 31b. The insertion portions 221b on the right side of the skeleton 2b and the periphery of the slot 41b of the other body plate 4b are welded to the periphery of the vertically continuous slot 41b by welds 61b so as to fit along the periphery of the vertically continuous slot 41b. The configuration of welds 61b is the same as that of welds 61 in the first embodiment, and is preferably formed by laser welding, for example, but can be formed by any appropriate welding method within the applicable range, such as TIG welding.

[0046] As in the second embodiment, the left and right side edges of the spine plate 21b are inserted as insertion portions into the slots 32b of one body plate 3b and the slots 42b of the other body plate 4b, respectively, so as to protrude outside, and are welded with welds 63b similar to welds 63a. Note that, to the right of the position where the rib plate 22b of the skeleton 2b is positioned, instead of the side edge of the spine plate 21b, a portion of the rib plate 22b is inserted as an insertion portion into the slots 42b of the body plate 4b, so as to protrude outside, and is welded with welds 63b similar to welds 63a. In the third embodiment, the welds 61b and 63b overlap at the intersections of the slots 31b and 32b and the slots 41b and 42b, respectively. Therefore, only one of the welds needs to be formed, or both welds may be formed to overlap. In the lure 1b of the third embodiment, as in the second embodiment, the periphery of one body plate 3b and the periphery of the other body plate 4b are engaged with each other around the entire circumference, and are welded together along the entire circumference of the engaged peripheries at welds 64b similar to welds 64a.

[0047] The lure 1b of the third embodiment has the same configuration as the lure 1a of the second embodiment and has the same effects. In addition, the slot 31b of one body plate 3b and the insertion portion inserted therein are vertically connected, and the slot 41b of the other body plate 4b and the insertion portion 221b inserted therein are vertically connected, so that welding scans at the welded portion 61b can be performed continuously, and the manufacturing process can be made more efficient.

[0048] [Lure of Fourth Embodiment] 8 and 9, a lure 1c according to a fourth embodiment of the present invention comprises a magnesium alloy skeleton 2c and a pair of magnesium alloy body plates 3c, 4c disposed so as to sandwich the skeleton 2c, and is configured by welding one body plate 3c to the skeleton 2c and welding the other body plate 4c to the skeleton 2c. In the lure 1c of the fourth embodiment, the periphery of one body plate 3c and the periphery of the other body plate 4c are abutted so as to face each other, and are integrated by welding at a welded portion 64c similar to the welded portion 64b around the entire periphery along the abutted edges.

[0049] The rest of the configuration of the fourth embodiment is the same as that of the third embodiment, with backbone plate 21c having slit 211c and rib plate 22c having insert portion 221c being the same as backbone plate 21b having slit 211b and rib plate 22b having insert portion 221b, respectively; slots 31c, 32c and slots 41c, 42c being the same as slots 31b, 32b and slots 41b, 42b, respectively; and welds 61b and 63b being the same as welds 61c and 63c, respectively.

[0050] The lure 1c of the fourth embodiment has a configuration corresponding to that of the lure 1c of the third embodiment and therefore has corresponding effects. In addition, the lure 1c of the fourth embodiment can eliminate the need to form an engaging portion such as a folded shape for engaging the periphery of one body plate 3b with the periphery of the other body plate 4, thereby making the manufacturing process more efficient.

[0051] [Lure of the fifth embodiment] 10 and 11, a fishing lure 1d according to a fifth embodiment of the present invention includes a magnesium alloy skeleton 2d and a pair of magnesium alloy body plates 3d and 4d sandwiching the skeleton 2d, with one body plate 3d welded to the skeleton 2d and the other body plate 4d welded to the skeleton 2d. A surface corrosion-resistant layer 5 is provided on the outer surface of the fishing lure 1d, and in the fifth embodiment, the surface corrosion-resistant layer 5 is also provided on the outer surface of the fishing lure 1d composed of one body plate 3d and the other body plate 4d. The configurations of the surface corrosion-resistant layer 5, hook attachment portion 71, fishing line attachment portion 72, and hook 73 in the fifth embodiment are the same as those in the first embodiment.

[0052] The skeleton 2d in the fifth embodiment is composed of a plurality of assemblies 23d arranged at intervals in the fore-and-aft direction of the lure, and each assembly 23d is in the shape of a cross pillar. Each assembly 23d is composed of approximately rectangular skeletal plates 24d that correspond to the skeletal material, and the assembly 23d is composed of two skeletal plates 24d that are fitted into slits formed in the skeletal plates 24d. The two skeletal plates 24d that make up the assembly 23d are fitted together or welded and fixed around the slits that fit together.

[0053] The skeletal plates 24d, which correspond to the skeletal material, are press-formed materials, but skeletal plates other than press-formed materials can also be used. Each skeletal plate 24d is made of a magnesium alloy, preferably AZ10A, AZ31B, or AZ31C, an Mg-Al-Zn alloy that has excellent ductility and weldability during press forming.

[0054] As in the first to fourth embodiments, the one body plate 3d and the other body plate 4d are each a shell-shaped curved plate and are formed of a magnesium alloy, preferably an Mg-Al-Zn alloy such as AZ10A, AZ31B, or AZ31C, which has excellent ductility and weldability during press forming. The one body plate 3d and the other body plate 4d are preferably press-formed materials. In a lure 1d comprising a magnesium alloy skeleton 2d and a pair of magnesium alloy body plates 3d, 4d, the lure 1d preferably contains 89% to 99% by mass, and more preferably 94% to 99% by mass, of magnesium, from the viewpoint of dissolving the majority of the lure 1d in seawater and returning it to the sea, thereby significantly reducing the burden on the marine environment.

[0055] One fuselage plate 3d and the other fuselage plate 4d, disposed on both the left and right sides of the frame 2d, have slots 33d, 43d formed at intervals in the longitudinal direction of the frame 2d at positions corresponding to each assembly 23d. Four slots 33d are formed in a cross shape extending forward and backward and up and down on one fuselage plate 3d at a position corresponding to each assembly 23d, with the center of the cross formed by the arrangement of the four slots 33d remaining blank. Similarly, four slots 43d are formed in a cross shape extending forward and backward and up and down on the other fuselage plate 4d at a position corresponding to each assembly 23d, with the center of the cross formed by the arrangement of the four slots 43d remaining blank.

[0056] The skeletal plate 24d is formed with protruding insertion portions 241d that locally protrude in the surface direction of the skeletal plate 24d. In the fifth embodiment, the insertion portions 241d are formed in two locations on each side of the skeletal plate 24d, with two insertion portions 241d spaced apart from each other. The insertion portions 241d of the skeletal plate 24d are arranged in a cross shape when assembled into the assembly 23d. The insertion portions 241d of the assembly 23d are engaged with the cross-shaped slots 33d of one fuselage plate 3d and the cross-shaped slots 43d of the other fuselage plate 4d, respectively, and are inserted so as to protrude outside the slots 31d of one fuselage plate 3d and the slots 41d of the other fuselage plate 4d, respectively.

[0057] The insertion portion 241d of the assembly 23d constituting the skeleton 2d is welded to the periphery of the slot 33d of one of the fuselage plates 3d at a weld 65d, and the insertion portion 241d of the assembly 23d constituting the skeleton 2d is welded to the periphery of the slot 43d of the other fuselage plate 4d at a weld 65d. The weld 65d is preferably a welded portion formed by laser welding, but can be a welded portion formed by any appropriate welding method within an applicable range, such as TIG welding.

[0058] The periphery of one fuselage plate 3d and the periphery of the other fuselage plate 4d are engaged with each other around the entire periphery and are welded together at a weld 64d along the entire periphery of the engaged periphery. The weld 64d is preferably formed by laser welding, but can be formed by any appropriate welding method within the applicable range, such as TIG welding. A hollow space is then formed between the one fuselage plate 3d and the other fuselage plate 4d.

[0059] The lure 1d of the fifth embodiment has a configuration corresponding to that of the lure 1a of the second embodiment and therefore has corresponding effects. In addition, in the lure 1d of the fifth embodiment, the assembly 23d and the skeletal body 2d can be constructed using the skeletal plate 24d, which is the same type of skeletal material, and the manufacturing cost can be reduced by sharing the components.

[0060] [Lure of Sixth Embodiment] 12 to 14, a lure 1e according to a sixth embodiment of the present invention comprises a magnesium alloy skeleton 2e and a pair of magnesium alloy body plates 3e and 4e disposed so as to sandwich the skeleton 2e, and is configured by welding one body plate 3e to the skeleton 2e and welding the other body plate 4e to the skeleton 2e. A surface corrosion-resistant layer 5e is provided on the outer surface of the lure 1e, and in the fifth embodiment, the surface corrosion-resistant layer 5e is provided on the outer surface of the lure 1e constituted by one body plate 3e, the other body plate 4e, and the skeleton 2e.

[0061] The skeletal body 2e in the sixth embodiment is composed of an upper skeletal plate 25e and a lower skeletal plate 26e that are arranged facing each other with a gap between them in the vertical direction, and the upper skeletal plate 25e and the lower skeletal plate 26e correspond to the multiple skeletal members that make up the skeletal body 2e. The upper skeletal plate 25e and the lower skeletal plate 26e are each formed in a substantially elliptical shape with the longitudinal direction of the lure as the longitudinal direction, and are formed with protruding convex portions 251e and 261e in the central portions to increase strength.

[0062] Insertion portions 252e, 252e that protrude partially outward are formed on portions of the periphery on both sides of the upper skeletal plate 25e, and insertion portions 262e, 262e that protrude partially outward are formed on portions of the periphery on both sides of the lower skeletal plate 26e. In the illustrated example, the upper skeletal plate 25e and the lower skeletal plate 26e have the same shape, which allows for the sharing of parts and reduces manufacturing costs.

[0063] The upper skeletal plate 25e and the lower skeletal plate 26e are each made of a press-formed material, but a skeletal material other than a press-formed material can be used for either or both of the upper skeletal plate 25e and the lower skeletal plate 26e. The upper skeletal plate 25e and the lower skeletal plate 26e are each made of a magnesium alloy, preferably AZ10A, AZ31B, AZ31C, or the like, which is an Mg-Al-Zn alloy that has excellent ductility and weldability during press forming.

[0064] One fuselage plate 3e and the other fuselage plate 4e are each a shell-shaped curved plate made of a magnesium alloy, preferably an Mg-Al-Zn alloy such as AZ10A, AZ31B, or AZ31C, which has excellent ductility and weldability during press forming. One fuselage plate 3e and the other fuselage plate 4e are also made of press-formed material, but materials other than press-formed materials can also be used.

[0065] In lure 1e, which is composed of a magnesium alloy skeleton 2e and a pair of magnesium alloy body plates 3e, 4e, the magnesium content of the lure 1e as a whole is preferably 89% to 99% by mass, and more preferably 94% to 99% by mass, from the viewpoint of dissolving most of lure 1e in seawater and returning it to the sea, thereby significantly reducing the burden on the marine environment.

[0066] One fuselage plate 3e and the other fuselage plate 4e are arranged on the left and right sides of an upper skeletal plate 25e and a lower skeletal plate 26e, which are arranged opposite each other with a vertical gap between them, and one fuselage plate 3e and the other fuselage plate 4e, which are arranged on both the left and right sides of the upper skeletal plate 25e and the lower skeletal plate 26e, have slots 34e and 44e formed therein, respectively, which extend in the longitudinal direction and are spaced apart vertically.

[0067] The inserting portions 252e and 252e on both sides of the upper skeleton plate 25e are respectively engaged with the upper slots 34e of one fuselage plate 3e and the upper slots 44e of the other fuselage plate 4e, and are inserted so as to protrude outside the slots 34e of one fuselage plate 3e and the slots 44e of the other fuselage plate 4e. The inserting portions 262e and 262e on both sides of the lower skeleton plate 26e are respectively engaged with the lower slots 34e of one fuselage plate 3e and the lower slots 44e of the other fuselage plate 4e, and are inserted so as to protrude outside the slots 34e of one fuselage plate 3e and the slots 44e of the other fuselage plate 4e.

[0068] The insertion portion 252e on one fuselage plate 3e side of the upper skeleton plate 25e is welded to the periphery of the upper slot 34e of one fuselage plate 3e at a weld 66e, and the insertion portion 252e on the other fuselage plate 4e side of the upper skeleton plate 25e is welded to the periphery of the upper slot 44e of the other fuselage plate 4e at a weld 66e. Also, the insertion portion 262e on one fuselage plate 3e side of the lower skeleton plate 26e is welded to the periphery of the lower slot 34e of one fuselage plate 3e at a weld 66e, and the insertion portion 262e on the other fuselage plate 4e side of the lower skeleton plate 26e is welded to the periphery of the lower slot 44e of the other fuselage plate 4e at a weld 66e.

[0069] In other words, a portion of the periphery of the upper skeletal plate 25e arranged on the side of one fuselage plate 3e and a portion of the periphery of the lower skeletal plate 26e are welded to one fuselage plate 3e at welds 66e, and a portion of the periphery of the upper skeletal plate 25e arranged on the side of the other fuselage plate 4e and a portion of the periphery of the lower skeletal plate 26e are welded to the other fuselage plate 4e at welds 66e. The welds 66e are preferably welded by laser welding, but can be welded by any appropriate welding method within an applicable range, such as TIG welding.

[0070] The surface corrosion-resistant layer 5e may be any suitable layer as long as it can provide the corrosion resistance and rust prevention against seawater corrosion required for a lure product, and may be the same as the surface corrosion-resistant layer 5 in the first embodiment. In addition, it is preferable that the mass percentage of the entire surface corrosion-resistant layer 5e relative to the lure 1e is about 1 to 2%.

[0071] The lure 1e is provided with a hook attachment portion 71e, to which a hook 73e is attached, and a fishing line attachment portion 72e, to which a fishing line is attached. In the illustrated example, the fishing line attachment portion 72e is formed on the upper skeletal plate 25e, and the hook attachment portion 71e is formed on the lower skeletal plate 26e, but the configuration for forming the fishing line attachment portion 72e and the hook attachment portion 71e is appropriate within the scope of the present invention.

[0072] The lure 1e of the sixth embodiment has the same configuration as the lure 1 of the first embodiment and thus achieves the same effects. Furthermore, the lure 1e of the sixth embodiment can be configured with only an upper skeletal plate 25e and a lower skeletal plate 26e, thereby reducing the number of parts, assembly work, and manufacturing costs. Unlike lures that have hollow spaces containing air inside, the lure's weight can be adjusted to a desired value simply by adjusting the weights of the upper skeletal plate 25e, the lower skeletal plate 26e, and both body plates 3e and 4e, making it easy to set the lure's weight. Furthermore, because the lure 1e has no hollow space inside and is structured to allow gaps to occur in the welded joints 66e, the tolerance for processing accuracy can be expanded, improving yields.

[0073] [Scope of the invention disclosed herein] The inventions disclosed in this specification include, in addition to the inventions, embodiments, and modifications thereof listed as inventions, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial effects are obtained and creating a generic concept. The inventions disclosed in this specification also include the following modifications and additions.

[0074] For example, the shape of one body plate and the shape of the other body plate in the lure of the present invention may be appropriate, and for example, the basic shape of one body plate and the basic shape of the other body plate may be configured to be different. Furthermore, the shape and size of the upper skeletal plate 25e and the lower skeletal plate 26e in the lure 1e of the fifth embodiment may be different. Furthermore, the magnesium alloy used in the lure of the present invention may be appropriate within an applicable range. [Industrial Applicability]

[0075] The present invention can be used as a lure for fishing. [Explanation of symbols]

[0076] 1, 1a, 1b, 1c, 1d, 1e... lure 2, 2a, 2b, 2c, 2d, 2e... skeletal body 21, 21a, 21b, 21c... spinal plate 211, 211a, 211b, 211c... slit 22, 22a, 22b, 22c... rib plate 221, 221a, 221b, 221c... insertion portion 23d... assembly 24d... skeletal plate 241d... insertion portion 25e... upper skeletal plate 251e... convex portion 252e... insertion portion 26e... lower skeletal plate 261e... convex portion 262e... insertion portion 3, 3a, 3b, 3c, 3d, 3e... one body plate 31, 31a, 32a, 31b, 32b, 31c, 32c, 33d, 34e...slots 4, 4a, 4b, 4c, 4d, 4e...other body plate 41, 41a, 42a, 41b, 42b, 41c, 42c, 43d, 44e...slots 5, 5e...surface corrosion-resistant layer 61, 62, 61a, 63a, 64a, 61b, 63b, 64b, 61c, 63c, 64c, 64d, 65d, 66e...welds 71, 71e...hook attachment section 72, 72e...fishing line attachment section 73, 73e...hook G1...height difference of slot periphery G2...gap between insertion section and slot P1...protruding section of insertion section of framework

Claims

1. The aircraft comprises a magnesium alloy skeleton and a pair of magnesium alloy fuselage plates disposed so as to sandwich the skeleton, one of the fuselage plates and the framework is welded together, the other fuselage plate and the framework are welded together, A lure characterized in that a corrosion-resistant surface layer is provided on the outer surface.

2. one of the fuselage plates and the framework is laser welded; 2. The lure according to claim 1, wherein the other body plate and the skeleton are laser welded together.

3. 3. The lure according to claim 1, wherein the magnesium content is 89% by mass to 99% by mass.

4. a slot formed in each of said fuselage plates; The insertion portion of the skeleton is inserted into the slot so as to protrude outward, 3. The lure according to claim 1, wherein the insertion portion and the periphery of the slot are welded together.

5. 3. The lure according to claim 1, wherein the plurality of skeletal members constituting the skeletal body, the one body plate, and the other body plate are press-molded materials.

6. The skeleton body comprises an upper skeleton plate and a lower skeleton plate that are arranged opposite each other with a gap between them in the vertical direction, The upper skeletal plate and the lower skeletal plate are formed in a substantially elliptical shape with the lure's front-rear direction as the longitudinal direction, the one body plate and the other body plate are disposed on the left and right sides with the upper skeletal plate and the lower skeletal plate interposed therebetween, a part of a periphery of the upper skeletal plate and a part of a periphery of the lower skeletal plate arranged on the one fuselage plate side are welded to the one fuselage plate, 3. The lure according to claim 1, wherein a portion of the periphery of the upper skeletal plate and a portion of the periphery of the lower skeletal plate arranged on the side of the other body plate are welded to the other body plate.

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