JPH0351401B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a key chain for automobiles, door keys, etc. More specifically, it relates to a key chain that connects metal coin-shaped medals with a chain and attaches a name, various commemorative characters, marks, or product trademarks to the medals, a manufacturing method thereof, and a die-casting mold thereof. .

[Prior Art] For example, the one shown in FIG. 6 is known as a prior art. (Refer to Japanese Utility Model Application No. 60-180580) A hole is made in a part of the disc-shaped medal 50, and a chain 52 is passed through the hole. Both ends of the chain 52 are connected to open ends of a ring 51 made of an annular metal plate with a concave cross section. After the chain 52 and ring 51 are passed through the hole of the key, they are inserted against the annular elasticity to elastically fix the medal 1. 50 medals are the 7th
As shown in the figure, there are no uneven surfaces on the outer peripheral surface. Therefore, a concave groove 53 is formed on the inner peripheral surface of the ring 51 and the medal 50 is
Hold it so that it does not move. This medal 50 is
It is made by punching with a press. In order to create irregularities on this outer periphery, machining such as machining is required. In addition, in order to add a concave-convex pattern such as a mark or trademark to the front and back of the medal 50, further steps are required.
It is necessary to make a medal mold with a pattern, place the medal into the mold, and apply pressure with a press machine to form the medal.

[Problems to be Solved by the Invention] The method for producing medals described above is efficient for producing large quantities of medals, such as coins, that have the same shape and have no uneven pattern on the outer periphery. Even if a pattern is added, it is only a matter of creating streaks in the punching direction. Furthermore, in order to add patterns to the front and back sides of medals, it is necessary to prepare as many molds as there are patterns for each type of pattern. That is, machining alone requires two or more steps of punching and stamping, and it is necessary to prepare many types of stamping dies for each punching die pattern. The present invention provides a key holder that can meet the demand for key holders in a wide variety of small quantities, a manufacturing method thereof, and a die-cast mold thereof.

[Means for Solving the Problems] The present invention takes the following means for solving the above problems.

An annular ring 10 with a partially open ring and a ring 10
In a key chain having a chain 7 connected to both open ends of the ring 10 and a disc-shaped medal 1 connected to the chain 7, an outer circumferential protrusion 3 is formed on the outer circumferential surface of the medal 1, and an outer circumferential protrusion 3 is formed on the inner circumferential surface of the ring 10. This is a key chain characterized by having a groove 16 that engages with the outer peripheral protrusion 3 of the medal.

An annular ring 10 with a partially open ring and a ring 10
In the method for manufacturing a key chain, the medal is connected to the chain 7 at both open ends thereof, and the medal 1 is connected to the chain 7 and has a protruding disc-shaped outer periphery. This medal manufacturing method is characterized in that die casting is performed by arranging one outer peripheral protrusion.

A die-casting mold for manufacturing a disk-shaped medal 1, a ring 20, etc., which includes a fixed die 21, a movable die disposed opposite to the fixed die 22, and a movable die that approaches and separates from the fixed die 21, and the fixed die. and the movable die 22, members 36, 41 which are detachably attached and provided opposite to each other for forming the shape of the medal 1, etc.; and both members 36, 41.
This is a guy cast mold for manufacturing medals, etc., which has an injection port and runner for injecting molten metal under pressure into the space provided in between.

[First embodiment of key chain] What is shown in FIG. 1 shows the first embodiment of the present invention. The medal 1 has a disk shape and is made of metal such as zinc by die-casting as described later. An uneven mark is attached to the end face 2 of the medal 1, and this uneven mark is a registered trademark.
Create the necessary uneven shapes such as pet marks and initials. Furthermore, these marks may be colored. Instead of using uneven marks, the surface may be flattened and the marks and the like may be printed thereon.

A convex outer peripheral protrusion 3 is provided at the center of the circumferential surface of the medal 1 in the thickness direction. This outer peripheral protrusion 3 fits into a groove 16 of a ring 10, which will be described later. A ring attachment part 4 is provided on the outer periphery of the medal 1, and a small hole 5 is bored in the ring attachment part 4. A ring 6 is attached to this small hole 5 through the hole of the small hole 5. Furthermore, a chain 7 is passed through the ring 6. The chain 7 is a twisted oval ring in the figure, but it is not limited to this, and may be any type of chain that is normally used for decoration or accessories worn on the body, such as an oval or a circle. good.

The ring 10 is made by bending a metal plate. Both ends of this ring 10 are flat, and a small hole 12 is made in the flat part 11. The flat tip is chamfered 13. This is to prevent it from getting caught on clothing during use. A small ring 14 is passed through the small hole 12,
A chain 7 is passed through this small ring 14. The inner circumferential hole 15 of the annular ring 10 is provided with a groove 16 along the inner circumference of the inner circumferential hole 15 . The outer peripheral protrusion 3 fits into the groove 16 of the ring 10 and cannot be easily removed.

How to use the keychain When using this keychain as a name,
1 medal or 1 ring on the handle of a bag, bag, etc.
0, and after passing the chain 7 part into the handle, insert the medal 1 into the inner peripheral hole 15 of the ring 10 against the elasticity of the ring 10. The outer peripheral protrusion 3 of the medal 1 fits into the groove 16 of the ring 10 and cannot be easily removed. When used as a key chain, the ring 10 and the chain 7 are passed through the key hole at the same time, and then the medal 1 is inserted into the ring 10 to form the state shown in FIG.

[Second embodiment of medal] What is shown in FIG. 3 shows an embodiment in which the medal 1 is composed of a ring 20. The entire medal 1 of the embodiment described above is made of the same metal, but in this embodiment, only the annular ring 20 is made of metal. The casting mold for the ring 20 is a cylinder 36 of a die-casting mold 30, which will be described later.
The cylinder 41 is replaced and the end surface 37 of the cylinder 36 and the end surface 42 of the cylinder 41 are brought into direct contact (fifth
FIG. b), there is no need to manufacture a special mold for the ring 20.

A lid hole 21 is formed in the annular ring 20, and an insertion cylinder 23 of a synthetic resin lid 22 is inserted and fixed into the lid hole 21 from both sides of the lid hole 21.
When inserted, the collar 26 of the lid 22 stops at the end surface of the ring 20. Lid 22 with adhesive interposed on inner end surface 24
and the lid 22 are fixed to the ring 20. Since the inner end surfaces 24 are flat, even if no adhesive is used, if the inner end surfaces 24 are pressed together, there will be no air between them, creating a vacuum state, allowing them to be pressed together using atmospheric pressure.

In addition, if the lid 22 is made of transparent synthetic resin, it can function not only as a key chain but also as a pendant by interposing a photo, picture, etc. between the two lids 22 and fixing it with adhesive or vacuum suction. can. If the outer end surface 25 of the lid 22 is subjected to processing such as printing, there is no need for press molds or die-cast molds for each pattern, and trademarks, marks, etc. can be easily displayed.

[Method for Manufacturing the Medal of the First Embodiment] A hot chamber die-casting machine is used to manufacture the medal 1 of the present invention. The hot chamber type has a molten metal heat-retaining furnace built into the casting machine, and the pressurized chamber for injecting the molten metal forms part of this furnace and is constantly heated. The injection of molten metal is sometimes performed using compressed air, but in recent years it is performed using hydraulic pressure via a flagier, and the pressure has increased to 70 to 350 atm. Mold clamping, pouring,
All operations in one casting cycle, such as opening the mold and peeling off the product, are automated, and casting is performed at a high speed of 100 to 1,000 shots (number of castings) per hour. However, since the pressurized chamber is always immersed in the molten metal, this casting machine is for low-fusion alloys such as zinc alloys and below.

What is shown in FIG. 4 is a die-casting die of the die-casting machine for producing medals 1 made of zinc alloy. The die-casting mold 30 is divided into a fixed mold 31 and a movable mold 32, which are usually used side by side. Guide pins 33 are provided at the four corners of the fixed mold 31, and the guide pins 33 are inserted into the guide pin holes 34 of the movable mold 32 and positioned, and both molds are used while being clamped. A removable mold 39 is located approximately in the center of the fixed mold 31.
It is fixed with screws or other means.

A cylindrical hole 35 is formed in the removable mold 39, and a cylinder 36 is fitted into this hole 35. The end surface 37 of the cylinder 36 is engraved with a pattern in which the unevenness of the pattern on the end surface 2 of the medal 1 is reversed. A screw hole is provided on the opposite end surface of the cylinder 36, and a bolt 38 for fixing the cylinder 36 to the removable mold 34 is screwed into this screw hole. By turning the bolt 38, the cylinder 36 is firmly fixed to the removable mold 39. To adjust the thickness of medal 1, use cylinder 3.
The thickness of the medal is adjusted by interposing a washer or the like between the surface where the screw hole 6 is provided and the bottom surface of the hole 35.

Moreover, when changing the pattern of the medal 1, it is only necessary to replace the cylinder 36, and there is no need to replace the entire die-cast mold 30. The medal 1 mentioned above is
The medals are often used for sales promotions, souvenirs, etc., and the end face 2 of the medal 1 is required to have various patterns such as trademarks, marks, initials, etc. of the orderer. In this example,
These orders can be met simply by replacing the cylinder 36. A removable mold 40 identical to the fixed mold 31 is provided on the movable mold 32 at a position opposite to the fixed mold 31. The cylinder 41 has a similar structure to the cylinder 36 and is provided facing each other. The end surface 3 of the cylinder 41 is
Similar to 7, a pattern is formed. Various patterns can be created by combining the above patterns.

The diagram shown in FIG. 5a shows the state in which the medal 1 is cast. The molten zinc alloy is pressurized with the fixed mold 31 and the movable mold 32 combined, but since there is a mating surface 43, it is inevitable that burrs will appear on the outer periphery of the medal 1. A special process is required to remove this burr. For this reason, the medal 1 of the present invention is provided with an outer peripheral protrusion 3 on the outer periphery. The portion of the outer peripheral protrusion 3 is the medal 1
Because it is thinner than the main body, there is less flow resistance, and the flow of hot water is slightly slower due to cooling, so there are fewer burrs. Further, although some burrs appear on the outer periphery of the outer circumferential protrusion 3, the burrs are reduced to such an extent that there is no problem in practical use, so there is no need for a special process to remove the burrs. As described above, the outer circumferential protrusion 3 fits into the groove 16 of the ring 10 and serves to securely fix the medal 1 to the ring 10.

[Method for manufacturing the ring 20 of the second embodiment] The casting mold for the ring 20 is the die-casting mold 20 described above.
The cylinder 36 and the cylinder 41 are replaced, and the end surface 37 of the cylinder 36 and the end surface 42 of the cylinder 41 are brought into direct contact (Fig. 5b), and it is necessary to manufacture a special mold for this example. There isn't. In this way, the present die casting mold 30 allows the medal 1 and the ring 20 to be cast in the same mold.

[Other Manufacturing Methods] The above-mentioned embodiments are all related to the manufacturing method of the medal 1, but the above-mentioned die-casting mold 3
0 can also produce three-dimensional shapes. What is shown in FIG. 8 is an example thereof. A die-cast product 60 having a three-dimensional shape and a concave groove 61 opposite to the cylinder 4
1.36. When the cylinder 41 and the cylinder 36 are brought into contact with each other while facing each other, the flat portions 62 of the cylinder 41 and the cylinder 36 come into close contact. Concave groove 61 of cylinder 41
and the concave groove of the cylinder 36, creating the same space as the three-dimensional die-cast product 60, and the molten metal is supplied from the runner 63 to this space to form the three-dimensional die-cast product 6.
0 is cast. Furthermore, although the cylinders 36 and 41 are cylindrical in shape, they are not limited to being cylindrical, and may have any shape such as a rectangular or elliptical cross section.

[Effects of the Invention] As described in detail below, since the medal of the key chain of the present invention has protrusions on the outer periphery, the medal 1 can be easily attached and removed, and will not come off. Furthermore, since the medals are cast using the die-casting method described above, a wide variety of shapes can be manufactured with fewer steps. Furthermore, since a cylinder that can be replaced with a die-casting mold is provided, the number of types of die-casting molds can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overview diagram showing the implementation of FIG. 1 of the present invention;
Figure 2 is a cross-sectional view of Figure 1, Figure 3 is a second embodiment of the key chain, Figure 4 is a die-cast mold for manufacturing medals, Figure 5 is a cross-sectional view of the medal casting part of the die-cast mold, and Figure 6 is a cross-sectional view of the medal casting part of the die-cast mold. The figure shows a conventional key holder, FIG. 7 is a sectional view of FIG. 6, and FIG. 8 is a diagram showing a method of manufacturing other products. 1... Medal, 3... Outer protrusion, 7... Chain, 1
0...Ring, 20...Circular, 30...Die-cast type, 36, 41...Cylinder.

Claims (1)

[Claims] 1. A partially open annular ring 10;
In a key chain having a chain 7 connected to both open ends of the ring 10 and a disc-shaped medal 1 connected to the chain 7, an outer circumferential protrusion 3 is formed on the outer circumferential surface of the medal 1, and an outer circumferential protrusion 3 is formed on the inner circumferential surface of the ring 10. A key chain characterized in that it has a concave groove 16 that engages with the outer peripheral protrusion 3 of the medal. 2 A partially open annular ring 10 and a ring 10
In the method for manufacturing a key chain, the medal is connected to the chain 7 at both open ends thereof, and the medal 1 is connected to the chain 7 and has a protruding disc-shaped outer periphery. 1. A method for manufacturing a medal, characterized in that die casting is performed by arranging the outer peripheral protrusions of 1. 3. A die-casting mold for producing disk-shaped medals 1, rings 20, etc., and the fixed die 2 is arranged opposite to the fixed die 21 and the fixed die 22.
a movable die that approaches and separates from the medal 1; members 36, 41 that are removably attached to and opposite the fixed die and the movable die 22 and that form the shape of the medal 1, etc.; and both members 36, 41. A guy cast mold for manufacturing medals, etc., equipped with an injection port and runner for injecting molten metal under pressure into the space provided in between.