Waterproof coin holder, method for manufacturing a waterproof coin holder, and method for manufacturing a waterproof coin holder with decorative members.

Abstract

This invention provides a waterproof coin holder that easily waterproofs coins and prevents heat from being transferred to the coins when soldering decorative components. [Solution] The waterproof coin holder of the present invention is characterized by comprising a coin 1, a coin frame 2 that houses the coin and has a decorative member laser-welded to its outer circumference, a transparent heat-resistant material 3 that is fitted into the coin frame 2 and seals both the front and back surfaces of the coin 1, and a thermoplastic resin packing 11 that fits onto the outer circumference of the coin 1.

Description

[Technical Field]

[0001] The present invention relates to a waterproof coin holder used for personal adornments, and particularly to a waterproof coin holder, a method for manufacturing the waterproof coin holder, and a method for manufacturing a waterproof coin holder with a decorative member, wherein the waterproof performance of the waterproof coin holder is not impaired even if a decorative member is welded (also referred to as joining) to the outer periphery of the coin frame after a coin is fitted therein, and the coin is not deformed or discolored due to high temperature during joining. [Background Art]

[0002] Some wearable accessories such as necklaces, pendants, bracelets and brooches use a coin holder. In such accessories, gold coins, silver coins, commemorative coins, sixpence coins known as lucky items in Europe and America, etc. are stored in a coin frame, and a fitting is attached thereto to be used as a personal adornment.

[0003] Such a coin holder has a shape and size that can accommodate a coin with almost no gap, wherein the coin is placed in a noble metal frame (referred to as a "coin frame" in the present specification) configured to allow visual recognition of substantially the entire both sides of the coin, and is fixed by a fitting means so as not to fall off.

[0004] For example, Patent Document 1 discloses a coin holder in which both sides of a coin are sandwiched between transparent heat-resistant materials (hereinafter referred to as transparent heat-resistant materials) and then placed in a coin frame. A decoration (referred to as a "decorative member" in the present specification) is attached to the coin holder by brazing so as to cover the outer periphery and outer edge of the coin frame. Further, the coin holder described in Patent Document 1 has a waterproof structure formed by bonding the outer periphery of the transparent heat-resistant material to the coin frame, thereby preventing moisture from entering the coin portion. Furthermore, in the coin holder described in Patent Document 1, heat-insulating zirconia is used as the material of the transparent heat-resistant material. Zirconia blocks heat generated when brazing a coin and a decorative member, thereby preventing deformation and discoloration of the coin sandwiched between the transparent heat-resistant materials caused by heat.

[0005] Typically, brazing is used to join decorative components to a coin frame. This is because soldering or adhesive bonding results in insufficient adhesive strength and a high likelihood of deterioration over time. Brazing is performed by heating the objects to be joined with a gas burner. The flame temperature of the gas burner is around 1300°C, and the objects to be joined are heated to around 1000°C or higher. Gold, silver, bronze, brass, and cupronickel are commonly used as coin materials, and all of these metals have melting points of around 900-1100°C. Therefore, in order to avoid deformation or discoloration of the coin during brazing, it is necessary to take the aforementioned heat insulating measures. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 7064798 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, in the coin holder described in Patent Document 1, adhesive must be applied to the outer circumference of the transparent heat-resistant material and to the coin frame in order to create a waterproof structure. Applying adhesive is a difficult and time-consuming task in which even the slightest gap is unacceptable. Furthermore, in the coin holder described in Patent Document 1, although the transparent heat-resistant material blocks the heat generated during brazing, heat can be transferred from the part where the coin touches the side of the coin frame, which may cause the coin to discolor or deform.

[0008] The present invention has been made in view of the above problems, and aims to provide a means for easily manufacturing a waterproof coin holder in which a coin is sandwiched between transparent heat-resistant materials, even by an inexperienced person, and a means for manufacturing a waterproof coin holder with decorative members that allows decorative members to be attached to the coin frame without damaging the coin after the coin has been inserted into the coin frame, and that allows for cleaning and finishing of the coin holder to which the decorative members have been attached. [Means for solving the problem]

[0009] The waterproof coin holder of the present invention is characterized by comprising a coin, a coin frame that houses the coin and has a decorative member welded to its outer circumference, a transparent heat-resistant material that is fitted into the coin frame and seals both the front and back surfaces of the coin, and a packing that fits onto the outer circumference of the coin.

[0010] The manufacturing method of the waterproof coin holder of the present invention involves fitting a thermoplastic resin packing around the outer circumference of a coin, The coin, with the aforementioned thermoplastic resin packing fitted to it, is sandwiched between transparent heat-resistant materials. A coin frame having a bendable portion on its upper edge that can be folded with a predetermined jig, and a protruding portion on the inside of its lower edge, into which the coin, with a thermoplastic resin fitted around its outer circumference and sandwiched between transparent heat-resistant materials, is inserted. The aforementioned folded portion is characterized by being folded using a predetermined jig. [Effects of the Invention]

[0011] According to the waterproof coin holder of the present invention, a gasket fitted to the outer circumference of a coin sandwiched between transparent heat-resistant materials acts as a sealing material, preventing water from entering the coin. This allows for cleaning and finishing of the coin holder even after the coin has been inserted into the coin frame. Furthermore, the gasket fitted to the outer circumference of the coin acts as an insulating material, preventing deformation and discoloration of the coin even if decorative members are welded to the outer circumference of the coin holder after the coin has been inserted. [Brief explanation of the drawing]

[0012] [Figure 1] This is a photograph of the exterior of a coin holder according to the first embodiment of the present invention. [Figure 2] This is a side view showing the disassembled components of a coin holder according to the first embodiment of the present invention. [Figure 3] This figure shows the shape and dimensions of a coin frame according to the first embodiment of the present invention. [Figure 4]It is a cross-sectional view showing a state where a coin and a ceramic disk are fitted into a coin frame according to the first embodiment of the present invention. [Figure 5] It is a cross-sectional view showing the shape and dimensions of a packing according to the first embodiment of the present invention. [Figure 6] It is a view showing the shape of a decorative member according to the first embodiment of the present invention. [Figure 7] It is a cross-sectional view of a joint portion between a coin frame and a decorative member according to the first embodiment of the present invention. [Figure 8] It is a flowchart showing a comparison of coin holder manufacturing processes between the method of the present invention and a conventional method. [Figure 9] It is a perspective cross-sectional view of a coin holder according to the second embodiment of the present invention. [Figure 10] It is a perspective cross-sectional view of a coin holder according to the third embodiment of the present invention. MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, the waterproof coin holder 100 of the present invention will be described based on each embodiment with reference to the drawings. The drawings schematically illustrate the waterproof coin holder 100, its constituent members, and the like, and actual dimensions and dimensional ratios do not necessarily match the dimensions and dimensional ratios shown in the drawings. Unless otherwise specified, for convenience, directions such as up and down are expressed based on the orientation of the waterproof coin holder 100 shown in Fig. 1. Redundant descriptions will be omitted as appropriate, and the same reference numerals may be given to the same members.

[0014] (First Embodiment) Fig. 1 is an external photograph showing a decorative member 4 joined to the waterproof coin holder 100 according to the first embodiment of the present invention. Fig. 2 is an exploded side view showing each component of this waterproof coin holder 100.

[0015] As shown in Figure 2, this waterproof coin holder 100 is composed of a coin 1, a coin frame 2, a transparent heat-resistant material 3a, and a transparent heat-resistant material 3b. The transparent heat-resistant material 3a and the transparent heat-resistant material 3b sandwich the coin 1 and play a role in preventing scratches and damage caused by external impacts and water intrusion. Each component will be described in detail sequentially below.

[0016] Figure 3 is a diagram showing the shape and dimensions of one embodiment of the coin frame 2, wherein Figure 3(a) is a plan view, Figure 3(b) is a cross-sectional view taken along line A-A of Figure 3(a), and dimensions are indicated in Figure 3(b). This coin frame 2 comprises a thin-walled cylindrical body 5 having side surfaces of approximately 3 mm, an overhanging portion 6 is provided at the bottom of the thin-walled cylindrical body 5, the center of the bottom is perforated, so that substantially the entire back surface (except a part near the outer edge) of the coin inside can be visually recognized. In addition, the top surface of the coin frame 2 is open, and the coin 1 is inserted therethrough.

[0017] Figure 4(a) shows a state where the coin 1, the transparent heat-resistant material 3a and the transparent heat-resistant material 3b are accommodated inside the coin frame 2. In addition, Figure 4(b) shows a bent portion 7 formed on the upper part of the thin-walled cylindrical body 5. The bent portion 7 is bent after the coin 1, the transparent heat-resistant material 3a and the transparent heat-resistant material 3b are accommodated inside the coin frame 2. The coin 1, the transparent heat-resistant material 3a and the transparent heat-resistant material 3b are sandwiched and fitted by the bent portion 7 and the overhanging portion 6.

[0018] The diameter and height of the thin-walled cylindrical body 5 can be appropriately changed according to the size of the coin 1 to be placed inside. In addition, the shape of the thin-walled cylindrical body 5 is not necessarily limited to a cylindrical shape, and any shape and size that can accommodate the coin 1 without a gap and is configured so that substantially the entire both surfaces of the coin 1 can be visually recognized is sufficient.

[0019] In this embodiment, platinum is used as the material of the coin frame 2. The material of the coin frame 2 is not limited to this, and can be freely selected as long as it has a certain degree of aesthetic properties.

[0020] In this embodiment, the decorative member 4 is joined to the coin frame 2 by laser welding. Laser welding allows for precise welding because it can focus on a very narrow area. Furthermore, because laser welding heats locally, the welded area cools quickly, making it efficient to use.

[0021] Next, we will explain the transparent heat-resistant material 3 shown in Figure 2. Examples of transparent heat-resistant material 3 include quartz glass (SiO2), corundum (crystalline Al2O3), yttrium oxide (Y2O3), YAG (3Y2O3·5Al2O3), and zirconia (ZrO2). Among these, quartz glass has an upper limit of operating temperature of about 1000°C, and its heat resistance is not sufficient. Corundum, yttrium oxide, and YAG have melting points of 1900-2500°C, and there are no problems with their heat resistance, but their thermal conductivity is 11-27 W / m·K, which is about 1 / 2 to 1 / 3 of the thermal conductivity of steel (about 40 W / m·K), and therefore it is not sufficient in terms of heat insulation.

[0022] In this embodiment, zirconia is used as the transparent heat-resistant material 3. Zirconia has a melting point of 2700 °C or higher and a thermal conductivity of approximately 3 W / m·K, which is less than one-tenth that of iron, making it excellent in terms of both heat resistance and heat insulation. Furthermore, zirconia is a relatively widely used ceramic and is readily available. Therefore, zirconia is the most suitable transparent heat-resistant material 3 to be used in this invention. As shown in Figure 2, the coin 1 is sandwiched between the transparent heat-resistant material 3a and the transparent heat-resistant material 3b, both of which are zirconia. As a result, the heat generated during laser welding of the coin frame 2 and the decorative member 4 is not transferred from the transparent heat-resistant material 3 to the coin 1.

[0023] In this invention, the thickness of the transparent heat-resistant material 3 is preferably 1 to 2 mm. If it is less than 1 mm, the heat insulation is insufficient, and if it exceeds 2 mm, the heat resistance and heat insulation plateau, while the weight and material cost of the coin holder increase, which is undesirable.

[0024] In this embodiment, the transparent heat-resistant material 3 is in the form of a flat plate, but it is not limited to this. The shape of the transparent heat-resistant material 3 may be, for example, a lens shape with the surface slightly protruding outwards.

[0025] As shown in Figure 4, a packing 11 is sandwiched (fitted) between the transparent heat-resistant material 3a and the transparent heat-resistant material 3b. Figure 5 shows the dimensions of the packing 11. In this embodiment, the packing 11 is formed in an annular shape with a height of approximately 0.8 mm. A coin 1 is placed in the inner diameter portion of the packing 11. As shown in Figure 5, the packing 11, which is rectangular in cross-sectional view, is provided with a flat upper surface 11a and a lower surface 11b that are in close contact with the periphery of the transparent heat-resistant material 3, a cylindrical inner circumferential surface 11c that is in close contact with the periphery of the coin 1, and a cylindrical outer circumferential surface 11d that is in close contact with the inner circumferential surface of the coin frame 2. In this embodiment, the cylindrical inner circumferential surface 11c that is in close contact with the periphery of the coin 1 is deformed into an arc shape in cross-sectional view by being in close contact with the periphery of the coin 1.

[0026] As shown in Figure 4, the upper surface 11a is in close contact with the periphery of the transparent heat-resistant material 3a, which has a larger outer diameter than the coin 1. The lower surface 11b is also in close contact with the periphery of the transparent heat-resistant material 3b, which has a larger outer diameter than the coin 1. As mentioned above, the coin 1 is fitted into the inner diameter portion of the packing 11 formed by the inner circumferential surface 11c. The upper surface 11a and lower surface 11b, which are formed from a flexible resin as described later, function as waterproof sealing surfaces. Therefore, the area around the coin 1 is sealed by the transparent heat-resistant material 3a, the transparent heat-resistant material 3b, and the packing 11, keeping it watertight. The inner circumferential surface 11c deforms to the same shape as the periphery of the coin 1 and adheres to it, covering the entire circumference of the coin 1. In this way, the inner circumferential surface 11c prevents the coin 1 from shifting position and also acts as an insulating material. The outer circumferential surface 11d is in close contact with the inner circumferential surface of the coin frame 2, fixing the coin 1 to the coin frame 2. The packing 11 serves to secure the coin 1 and provide a waterproof seal.

[0027] As shown in Figure 5, the inner circumferential surface 11c and the outer circumferential surface 11d have a thickness of approximately 0.5 mm in the central part. As mentioned above, in this embodiment, the decorative member 4 is joined to the outer circumference of the coin frame 2 by laser welding. During laser welding, the decorative member 4 and the coin frame 2 become hot, but if the coin 1 also becomes hot, discoloration and deformation will occur in the coin. Gold, silver, bronze, brass, and cupronickel are commonly used as materials for the coin 1, but these are all metals with melting points of around 900 to 1100°C, and are prone to deformation and discoloration due to temperature changes.

[0028] In this embodiment, a packing with a thickness of approximately 0.5 mm is fitted to the coin 1 between the inner circumferential surface 11c and the outer circumferential surface 11d. Therefore, the heat generated by laser welding is insulated by the approximately 0.5 mm thick portion of the packing and is not directly transmitted to the coin 1. In this embodiment, thermoplastic polyurethane is used for the packing 11. Thermoplastic polyurethane is a resin that has elasticity and flexibility similar to rubber, is highly resistant to abrasion, and does not deteriorate easily even after long-term use. The heat transmitted from the coin frame heated by laser welding softens the thermoplastic polyurethane packing, causing the periphery of the coin, the periphery of the transparent heat-resistant material, and the inner surface of the coin frame to adhere and create a waterproof seal. Because thermoplastic polyurethane does not harden even in low-temperature environments and maintains its flexibility, it can still perform its role in fixing the coin 1 and providing a waterproof seal even in winter.

[0029] In this embodiment, the packing 11 is ring-shaped to be applied to a circular coin, but by making the packing 11 a shape that fits onto the coin 1, it can be applied to coins of various shapes, not just ring shapes.

[0030] Next, the manufacturing method of the waterproof coin holder 100 will be described. First, as shown in Figure 4(a), the coin 1 with the packing 11 attached is sandwiched between the transparent heat-resistant material 3. Next, with the upper end of the coin frame 2 open, the coin 1 with the packing 11 attached is fitted into the coin frame 2. In this embodiment, a bent portion 7 is provided around the entire circumference of the upper end of the coin frame 2, but it is also possible to provide multiple notches at predetermined intervals on the upper end of the coin frame 2 and to fit the coin in such a way that only the unnotched portion becomes the bent portion 7. The width of the bent portion 7 may be about 1 to 2 mm.

[0031] Next, as shown in Figure 4(b), the folded portion 7 at the upper end of the coin frame 2 is folded inward using a type of press work with a jig (not shown) to enclose the transparent heat-resistant material 3 and the coin 1.

[0032] Figure 6 shows the shape of the decorative member 4 in this embodiment, with Figure 6(a) being a plan view and Figure 6(b) being a side view. The inner wall surface 8 of the decorative member 4 is machined into a cylindrical shape with approximately the same diameter as the side shape of the coin frame 2. In addition, the height h of the inner wall of the decorative member 4 is manufactured to be approximately the same as the height of the coin frame 2 when the coin 1 is inserted.

[0033] Since the decorative component 4 largely depends on the aesthetic creativity of its manufacturer, its shape and pattern can vary widely, and the shape in this embodiment is merely one example. Furthermore, while precious metals and ceramics are commonly used as materials, there is no particular limit to the material, as long as it possesses a certain degree of aesthetic appeal.

[0034] Figure 7 is a cross-sectional view of the coin frame 2 with the decorative member 4 joined to it. During assembly, the coin frame 2 is inserted into the decorative member 4. The outer surface of the coin frame 2 fits almost seamlessly into the inner wall surface 8 of the decorative member 4. Also, the upper end of the inner wall surface 8 of the decorative member 4 is at the same height as the upper surface of the coin frame 2 (the upper surface of the bent portion 7). In this state, the decorative member 4 is joined to the coin frame 2 by laser welding.

[0035] Furthermore, the decorative component 4 requires an attachment part (not shown) for use as an accessory. For example, if it is to be made into a necklace or pendant, an attachment part to be attached to a chain around the neck is required. Also, if it is to be made into a brooch, a pin part to engage with clothing is required.

[0036] Figure 8 is a flowchart showing a comparison between the method of the present invention and the conventional method for manufacturing a waterproof coin holder 100, with Figure 8(a) showing the process of the present invention and Figure 8(b) showing the process of the conventional method. In the method of the present invention shown in Figure 8(a), the process involves attaching a gasket to the coin (S1), sandwiching the coin with the gasket attached between transparent heat-resistant materials (S2), inserting the coin and gasket sandwiched between transparent heat-resistant materials into the coin frame (S3), heating the coin and the other parts inserted into the coin frame (S4), temporarily bending the bent part with a jig (S5), heating the coin and the other parts inserted into the coin frame again (S6), and finally bending the bent part with a jig (S7). The coin holder is completed after these steps. The waterproof coin holder 110 with decorative members is completed by laser welding decorative members to the coin frame (S8) and polishing, cleaning, and finishing (S9). Here, the heating step in S4 and the temporary folding step in S5 can be omitted. Adding the heating step in S4 and the temporary folding step in S5 allows the periphery of the coin, the periphery of the transparent heat-resistant material, and the inner surface of the coin frame to adhere more closely due to the softening of the packing, resulting in a waterproof seal. Examples of heating devices include ovens and drying ovens. The heating temperature is preferably around 180°C, at which point the thermoplastic resin softens and becomes adhesive, and the heating time is preferably around 10 minutes.

[0037] In one embodiment of the present invention, a waterproof coin holder with a decorative member is formed by laser welding the coin frame 2 and the decorative member 4. As shown in Figure 5, in this embodiment, the packing 11 has a thickness of approximately 0.5 mm between its inner circumferential surface 11c and outer circumferential surface 11d. When the decorative member 4 is laser-welded to the coin frame 2, the heat from the coin frame 2 is insulated by the thermoplastic polyurethane forming this 0.5 mm thick portion, making it difficult for the heat to be transferred to the coin 1. As described above, the coin 1 is sealed around the periphery by the transparent heat-resistant material 3a, the transparent heat-resistant material 3b, and the packing 11, keeping it watertight. Furthermore, the thermoplastic polyurethane used in the packing 11 softens with the heat of the heater, improving its adhesion and thus enhancing the sealing performance. In this way, the waterproof coin holder 100 using the packing 11 does not damage the coin 1 even when laser welding is performed to join the decorative member 4, and does not impair the waterproof performance.

[0038] In contrast, in the conventional method shown in Figure 7(b), the process involves applying adhesive to the lower edge of the coin frame (S1), inserting a transparent heat-resistant disc into the coin frame (S2), inserting a coin (S3), inserting a transparent heat-resistant disc into the coin frame (S4), applying adhesive to the upper edge and folded portion of the coin frame (S5), and folding the folded portion of the upper end of the coin frame using a jig (S6). The coin holder is completed at this stage. Then, the decorative member is brazed to the coin frame (S7), and the coin holder and decorative member are polished, cleaned, and finished (S8) to complete the waterproof coin holder with a decorative member. In the conventional manufacturing method, the coin frame is heated by the heat of brazing during the process of brazing the decorative member to the coin frame (S7). However, since both the front and back sides of the coin are sandwiched between the transparent heat-resistant disc, the heat from the coin frame is not transferred to the coin holder. However, the outer surface of the coin that is not covered by the transparent heat-resistant disc is in direct contact with the coin frame, which means that the high heat from the soldering process is transferred to the coin, causing deformation and discoloration.

[0039] In this embodiment, the waterproof coin holder with decorative members has the decorative members 4 joined to the coin frame 2 by laser welding, thus minimizing the thermal impact on the coin 1. Furthermore, since the use of thermoplastic polyurethane as the material for the packing 11 ensures waterproof performance, polishing and cleaning can be easily performed. In addition, the user can swim in the sea or a swimming pool while wearing the waterproof coin holder 100. It differs from the waterproof coin holder 100 according to the first embodiment in the points described below, but otherwise has the same configuration as the waterproof coin holder 100 according to the first embodiment. Therefore, the same reference numerals are used for the same components, and detailed explanations are omitted.

[0040] (Second Embodiment) Figure 9 shows a waterproof coin holder 200 according to a second embodiment of the present invention. The coin 1 housed in the waterproof coin holder 200 is elliptical in plan view. Thus, the shape of the waterproof coin holder 200 is not particularly limited, as long as a sealed space for housing the coin 1 is formed by the transparent heat-resistant material 3a or transparent heat-resistant material 3b and the packing 11. Furthermore, the shape and material of the packing 11 are not limited. In this embodiment, a commercially available O-ring can also be used as the packing 11. Thus, the waterproof coin holder 200 can be used for coins 1 that are not circular.

[0041] (Third embodiment) Figure 10 shows a waterproof coin holder 300 according to a third embodiment of the present invention. The coin 1 housed in the waterproof coin holder 300 has a hexagonal shape in plan view. In this case, the packing 11 also has a hexagonal shape, similar to the coin 1. The thermoplastic polyurethane used in the packing 11 is a resin with rubber-like elasticity and flexibility. For this reason, the packing 11 can also be used in a waterproof coin holder 300 that houses a hexagonal coin 1. [Explanation of Symbols]

[0042] 1 coin 2 coin slots 3 Transparent heat-resistant material 3a transparent heat resistant material 3b Transparent heat resistant material 4. Decorative components 5. Thin-walled cylindrical body 6. Protruding section 7. Folding section 8. Inner wall surface 9. Gathering area 10 Coin Holder 11 Gasket 11a Top side 11b Bottom side 11c Inner surface 11d Outer surface 100 Waterproof Coin Holder 110 Waterproof coin holder with decorative elements 200 Waterproof Coin Holder 300 Waterproof Coin Holder

Claims

1. The device comprises a coin, a coin frame that houses the coin and has a decorative member welded to its outer circumference, a transparent heat-resistant material fitted into the coin frame and sealing both the front and back surfaces of the coin, and a packing that fits onto the outer circumference of the coin. A waterproof coin holder characterized in that the periphery of the coin, the periphery of the transparent heat-resistant material, and the inner surface of the coin frame are waterproof-sealed by the packing.

2. The waterproof coin holder according to claim 1, characterized in that the packing is made of a thermoplastic resin, and the periphery of the coin, the periphery of the transparent heat-resistant material, and the inner circumferential surface of the coin frame are waterproof-sealed by the adhesive of the packing.

3. The waterproof coin holder according to claim 2, characterized in that the thermoplastic resin is thermoplastic polyurethane.

4. A waterproof coin holder with a decorative member, characterized in that a decorative member is attached to the outer circumference of the waterproof coin holder according to claim 2 or 3 by laser welding.

5. A thermoplastic resin gasket is fitted around the outer circumference of the coin. The coin, with the aforementioned thermoplastic resin packing fitted to it, is sandwiched between transparent heat-resistant materials. The coin is inserted into a coin frame having a bendable portion on its upper edge that can be folded with a predetermined jig, and a protruding portion on the inside of its lower edge. A method for manufacturing a waterproof coin holder, characterized by bending the aforementioned bent portion with a predetermined jig.

6. A method for manufacturing a waterproof coin holder according to claim 5, characterized in that the packing is heated to a predetermined temperature using a heater, and the periphery of the coin, the periphery of the transparent heat-resistant material, and the inner circumferential surface of the coin frame are waterproofed by the adhesive of the packing.

7. The method for manufacturing a waterproof coin holder according to claim 5 or 6, characterized in that the thermoplastic resin is thermoplastic polyurethane.

8. A thermoplastic resin gasket is fitted onto the coin. The coin, with the aforementioned thermoplastic resin packing fitted to it, is sandwiched between transparent heat-resistant materials. The coin is inserted into a coin frame having a bendable portion on its upper edge that can be folded with a predetermined jig, and a protruding portion on the inside of its lower edge. The aforementioned folded portion is folded using a predetermined jig. The packing is heated to a predetermined temperature using a heater, and the periphery of the coin, the periphery of the transparent heat-resistant material, and the inner surface of the coin frame are waterproofed by the adhesive of the packing. A method for manufacturing a waterproof coin holder with decorative members, characterized by welding decorative members to the outer circumference of the coin frame using a laser.

9. The method for manufacturing a waterproof coin holder with decorative members according to claim 8, characterized in that the waterproof coin holder with decorative members to which the decorative members are attached is cleaned and finished.

Images