JP2971865B1 - Molding equipment for thin plugs - Google Patents

Abstract

An object of the present invention is to provide a thin plug molding tool which can fix a flexible conductive wire accurately and quickly in an injection molding process. SOLUTION: A lead wire 4 is connected to a lower mold 1, an upper mold 2, and a fixed base 3.
To manufacture thin plugs. The lower mold 1 is provided with a recessed mold hole 11 at the center, two holes 14 are formed, and a groove 13 is formed at one end. The upper mold 2 is shaped to cover the lower mold 1 corresponding to the lower mold 1, and the fixing base 3 is provided with protective walls 31A, 31B, 3
1C is formed in the vertical direction, and two through holes 32 are formed. The conductors 4 connect the conductors 41 respectively, and the conductors 4
1, the plug foot 42 is extended in the vertical direction. When the plug foot 42 penetrates into the through hole 32, the conductor 41 is accommodated on the corresponding surface due to the limitation of the surrounding protective wall 31 </ b> A.
After placing the upper mold 2 on the corresponding lower mold 1, a plastic material is injected to form a thin plug.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plug molding device.

[0002]

2. Description of the Related Art Thin plugs are very practical because they take up little space and the direction of the plug foot is perpendicular to the direction of the conductor coming out of the plug. However, thin plug injection molding has certain disadvantages. That is, in the process of thin plug injection molding, even if the flexible conductor is controlled to be accurately positioned in the limited mold hole, it will move during molding and will be exposed after molding. The point is a key technology point.

FIGS. 9 and 10 show a conventional thin plug molding method, which is a method of supporting and fixing with a thin and rigid fork or wing. During the molding process, the flexible conductive wire is fixed and pinched at an accurate position inside the mold hole. If the fork or wing is removed before filling, the final stage of molding, the plastic material will flow into the cavity created when the wing is removed. Alternatively, if the wing is removed after the injection is completed, a cavity remains on the mold product. Forks or wings are made as thin as possible for convenient removal, but the problem arises here. That is,
When a fork-shaped or wing-shaped object is manufactured to be thin, sufficient rigidity cannot be maintained, so that it is impossible to localize the flexible conductive wire to an ideal position. There is another method of removing the wings after the plastic molding material has been set and hardened while leaving the wings in the mold. However, a very small and thin cavity remains on the molding. Although these cavities do not significantly affect the structure of the molded product, dents remain on the appearance of the finished product, which impairs the appearance. Also, in the above molding method, the conductor must be placed in the lower mold hole and fixed in position with a fork or a wing, and after the upper mold is covered with the lower mold, a plastic material must flow from the side and be molded. In addition, there is a problem that the manufacturing speed is reduced. That is, in the process of injection molding the whole, the above-mentioned conventional type requires the following steps.

The first step, assembling (incorporating the parts into the mold cavity). Before closing the upper and lower molds, the plugs, plug feet, and flexible conductive wires are assembled into the holes of the lower mold. The plug and the plug foot are passed through the pre-formed hole of the lower mold hole, and the flexible conductive wires are fitted one by one into the fork-like (or wing-like) knob end portions along the predetermined path. If the flexible conductor is longer than the path previously provided in the mold hole, the number of the forks increases accordingly. That is, by spending a lot of time fixing the fork-like object to the knob end,
Flexible conductors allow for accurate localization within limited mold hole heights.

Second step, closing the mold (closing the upper and lower molds) Third step, injecting the material (injecting the heat-fusion plastic material into the mold hole) After injecting the plastic material to be heat-fused into the mold hole, Allow to cool and solidify in mold cavity. At the end of this stage, the fork is removed or left in the mold cavity.

Fourth step, opening the mold (opening the upper and lower molds) After opening the mold, the entire solidified plastic material, including the parts incorporated in the first step, is taken out of the mold hole to obtain a finished product. Become. Thereafter, another part is set in the mold, and injection molding is repeatedly performed.

[0007]

However, in the above-mentioned first step in the conventional molding method of this kind, since the work is performed when the upper and lower molds are open, the opening and closing of the upper and lower molds is automatically controlled (ie, the regular opening and closing). ), The operator must complete the process within a limited amount of time, and if the fork incorrectly locks the flexible conductor,
Since this flexible power supply line moves and is exposed at the time of material injection, there is a possibility that defective products may be generated. When the opening and closing of the upper and lower molds is manually controlled, the second step is waited until the first step is completed.
Although the process proceeds to the step, the required time of the first step is not constant, which affects the production amount control. In addition, in the above-mentioned second and third steps, since the operator cannot perform any other operation, these two steps must be tenaciously completed, and the incomplete application of human power is remarkable.

[0008] In addition, the above-mentioned conventional molding method cannot perform a variety of effect requirements because it can perform thermal fusion injection only with a single plastic material. The following is an example.

1. Plastic that is too hard Even if the strength of the thin plug is relatively high, the connection between the plug end and the power supply line needs to have appropriate flexibility. Lack of line movement makes it difficult to use in diverse environments.

[0010] 2. Too soft plastic Even if the connection end has an appropriate flexibility, a thin plug tends to lack appropriate strength. The plug body is easily deformed by external force (such as when the plug is pulled out), and this kind of deformation occurs on a daily basis, and the connection points of the internal conductors are likely to be disconnected or poor contact, which is dangerous. .

3. Non-Heat-Resistant Plastic When using electrical products (irons, etc.) that require a relatively large current, a relatively high temperature is generated in the plug body. At this time, if the plastic of the plug body does not have heat resistance, it is likely to be softened by high temperature, which leads to plug deformation and severe accidents.

4. Selection of plastics that code for each of the above requirements If the hardness is appropriate, and fire-resistant and heat-resistant plastics are selected and injection molding is performed, the material costs will increase significantly and the market will lack competitiveness. In addition, thin plugs manufactured by the conventional injection molding method have little change in the appearance of the finished product, making it difficult to express the texture and specialty of the product. Very difficult to apply.

An object of the present invention is to provide a thin plug molding tool which can overcome the above-mentioned problems. Another object of the present invention is to propose a thin plug molding tool which can fix a flexible conductive wire accurately and quickly in the process of injection molding.

[0014]

According to a first aspect of the present invention, there is provided a thin plug molding tool having a lower mold, an upper mold, and a fixing base, wherein the lower mold is recessed at an appropriate depth at a central portion thereof. The mold hole is provided with a plurality of recessed fixed holding portions at one end, and a groove is formed at the side edge at the other end. A perforation is formed, the upper mold has a shape corresponding to the lower mold so as to cover the lower mold, a concave mold hole is provided in the center, a groove corresponding to the groove of the lower mold is formed at one end, and the fixing base is A protective wall having a suitable height is formed at an appropriate location in the vertical direction according to the shape of the conductor and the conductor, and two through holes are opened at appropriate locations at the ends of the two conductors. When a plug foot formed with a circular hole in the vertical direction below the connected conductor penetrates the through hole, the conductive Is tightly fitted in place due to the limitations of the protective wall surrounding the surroundings, place the fixed base containing the conductors in the mold hole of the lower mold, cover the upper mold, inject plastic material, and insert a thin plug. It is characterized by being molded.

According to a second aspect of the present invention, there is provided an apparatus for molding a thin plug, wherein an upper lid is provided on a fixed base containing a conductive wire, and the fixed base and the upper lid are integrally formed by being covered with a plastic material to be injected. And

According to a third aspect of the present invention, there is provided an apparatus for molding a thin plug, wherein a tenon or a projection is formed on a side surface of a protective wall of a fixing base to stably fix a conductor. The thin plug molding device according to the fourth aspect of the present invention is characterized in that a movable fixing rod is provided at the bottom of the lower mold, and is fitted into the plug foot hole to be positioned. The thin plug molding tool according to claim 5 of the present invention is characterized in that two holding members are provided on the bottom side of the lower mold, and the plug feet are pinched and positioned.

According to the thin plug molding tool of the present invention, a small projection or a depression is formed at an appropriate place around the outside of the fixing base, and the fixing base and the solidified plastic material are firmly fixed. Features.

According to the thin plug molding tool of the present invention, the stereotactic component is mounted on a fixed base containing a conductor,
An irregular body is connected to both sides of the bottom of the lid to the stereotactic component, and the irregular body is characterized by pressurizing the conductor.

According to the thin plug molding tool of the present invention, the localization component is characterized by injecting and molding a different plastic material. According to the thin plug molding tool of the ninth aspect of the present invention, a luminescent body (cold light body) or another light emitting component is separately mounted on the localization component 5, and light is emitted by using a part of the plug power supply. Features.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) A thin plug using a thin plug molding device according to a first embodiment of the present invention is manufactured by incorporating a conductive wire 4 into a lower mold 1, an upper mold 2 and a fixing base 3 as shown in FIG. I do.

The lower mold 1 is provided with a concave mold hole 11 having an appropriate depth at the center thereof. The shape of the mold hole 11 is
One of the narrower mold holes 11 is molded in accordance with the outer shape of the fixing base 3 to be described later, and a plurality of fixing holding portions 12 having concave portions are provided on the other side.
3 is molded and used as a place for injecting plastic, and two perforations 14 are opened at an appropriate place in the center.

The upper mold 2 has a shape suitable for covering the lower mold 1 corresponding to the lower mold 1, a concave mold hole 21 is provided at the center, and a groove corresponding to the lower mold 1 groove 13 is provided on one side. 2
Mold 2.

The fixed base 3 is a hard base having a suitable thickness and a shape close to an ellipse. The volume of the fixed base 3 is smaller than that of the mold hole 11 of the lower mold 1, and a suitable place on the base is slightly suitable. The protective walls 31A, 31B, 31C having different heights are formed in the vertical direction. The form of the protective walls 31A, 31B, and 31C is formed in accordance with the path of the conductor 4 and the shape of the conductor 4 conductor 41, which will be described later, and two through holes 32 are opened at appropriate positions opposite to the lower mold 1 perforation 14. A small number of protrusions 33 are formed at appropriate locations on the outer peripheral wall of the base body. (A hollow shape is also possible)

Each of the two ends of the conductive wire 4 is connected to a gate-shaped conductor 41, and a plug foot 42 having a circular hole 421 is formed vertically below the conductor 41. When assembling the above components and injecting a plastic material, the conductor 4 plug foot 42 is inserted into the fixing base 3 through-hole 32, and the conductor 4
The conductor 41 is housed on a tightly corresponding surface under the restriction of the protective wall 31A surrounding the fixing base 3 surrounding the periphery, and the protective walls 31B and 31C guide the conductive wire 4 to fix the position.
The fixing base 3 containing the conductive wire 4 is placed in the lower mold 1 mold hole 11, and at this time, the plug foot 42 of the conductive wire 4 penetrates into a perforation 14 provided in the lower mold 1 in advance, and the conductive wire 4 is fixed to the lower mold 1 fixing holding portion. 1
2 is fitted into the concave portion. Thereafter, the upper mold 2 corresponding to the lower mold 1 is covered, and a plastic material is injected from a liquid injection port formed in the upper mold 2 groove 22 and the lower mold 1 groove 13.
When the plastic material covers the outer periphery of the fixing base 3 and solidifies, a thin plug mold product is completed. As shown in FIG. 2, the molded product of the thin plug has the bottom of the fixing base 3 and the molded plastic material aligned in a flat condition.
The small protrusions 33 provided on the fixing base 3 enhance the fixing force on the fixing base 3 and the solidified plastic material when the plastic material covers the fixing base 3.

(Second Embodiment) In addition to the first embodiment, as shown in FIG. 3, it is also possible to manufacture a thin plug by mounting a localization component 5 on a fixed base 3 containing a conductor 4. The localization component 5 connects the irregular bodies 52 to both sides of the bottom of the lid 51. The size and shape of the irregular bodies 52 are based on the conductor 4 conductor 41, and the conductor 41 is appropriately added. When pressed, there is no fear that the conductive wire 4 plug foot 42 will be damaged in the process of molding the plastic material. In addition, the lid 51 provided at the upper portion between the two irregular bodies 52 is exposed after injection molding of the plastic material, and has an effect of flattening the surface of the thin plug.

(Third Embodiment) As shown in FIG.
It is also possible to manufacture a thin plug by drawing a trademark or various designs on it in advance, so that no further processing is required after molding. For the entire localization component 5, it is possible to use a material such as transparent, night light, luminescence (cold light), and temperature-sensitive discoloration. When the localization component 5 is made of a transparent material, the components inside the plug can be seen through from the outside of the finished plug product, which has a very special visual effect. In addition, the localization parts 5
When is made of a luminous material, the plug can be made to stand out at night, and when it is made of a temperature-sensitive discoloration material, an abnormal temperature of the plug can be notified. When luminescence or other light-emitting components are used on the lid 51, a part of the power supply of the plug is used, so that it has the effect of emitting light by itself at night, and it is more convenient to remove the plug at night. As described above, the localization component 5 changes in a wide variety of ways, and this corresponds to various additional effects in addition to the diversification in the appearance of the present invention.

(Fourth Embodiment) The second embodiment and the third embodiment
In addition to the position fixing method according to the embodiment, as shown in FIG.
It is also possible to manufacture a thin plug in which the upper lid 6 is provided on the fixing base 3 of the conductor 4. An irregular body 61 formed on the bottom of the upper lid 6 is formed in accordance with the size of the conductor 4 and the conductor 41 is appropriately pressed. If it is desired to mold a thin plug having a fireproof function, if the fixing base 3 and the upper lid 6 are made of a fireproof material, a plastic material to be injected and molded to the outside may be a general material. In general, locations where line shots are relatively likely to occur
The connecting point between the conductor 4 and the plug foot 42 is provided. When the fixing base 3 and the upper lid 6 having the fireproof property are used, besides fixing the conductor 4, the fireproof effect is provided to the molded thin plug. As a result, expensive fire protection paint costs are saved. The thin plug after molding has a form in which the upper lid 6 is completely wrapped in a plastic material, and the exposed portion is only the bottom of the fixing base 3.

(Fifth Embodiment) In the process of injecting a plastic material, the conductor 41 is fixed in the protective wall 31A tightly, as described above. Other than this tightly integrated method, as shown in FIG. 6, there is a method of localizing the conductor 41 during the injection process to produce a thin plug. A tenon 34 or a protrusion is provided beside the protective wall 31A of the fixed base 3 so that the conductor 41 of the conductive wire 4 can be fixed to the corresponding fixed base 3.
When fitting it in, fit it.

(Sixth Embodiment) Also, in the unlikely event that the conductor 4 conductor 41 and the fixing base 3 protective walls 31A, 31B, 31C are not tightly assembled, as shown in FIG. It is also possible to manufacture a thin plug using the movable fixed rod 7, and to connect the thin plug to the circular hole 4 of the conductive wire 4 plug foot 42.
If the plug foot 42 is fixed by being inserted into the plug 21, the position does not move during the injection and molding processes.

(Seventh Embodiment) In addition, as shown in FIG. 8, a method of manufacturing a thin plug by removing two molds at the bottom side of the lower mold 1 when opening the mold using two holding members 8 is also possible. Is closed, the lead wire 4 plug foot 42 is appropriately pinched and fixed.

[0031]

As described above, the thin plug molding device of the present invention has a feature that the plug foot and the conductor are fixed in advance to the fixing base. Thereby, when performing the injection molding, the worker can perform these operations ahead of the mold, which is effective for speeding up the production process.
In addition, the present invention is characterized in that an appropriate protective wall is designed on the fixed base. Thus, the flexible conductive wire is fixed, the path of the conductive wire is made constant, and the position of the wire is surely eliminated during the molding process. In addition, by combining the lids of different forms with the fixed base, a variety of appearances and additional effects are added to the finished product, and the practical value of the finished product is greatly increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a thin plug using a thin plug molding device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a thin plug using a thin plug molding device according to a first embodiment of the present invention.

FIG. 3 is an exploded perspective view of a thin plug molding device according to a second embodiment of the present invention.

FIG. 4 is a partially cutaway perspective view of a thin plug using a thin plug molding device according to a third embodiment of the present invention.

FIG. 5 is an exploded perspective view of a thin plug molding device according to a fourth embodiment of the present invention.

FIG. 6 is a perspective view of a thin plug molding device according to a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a thin plug using a thin plug molding device according to a sixth embodiment of the present invention.

FIG. 8 is a cross-sectional view of a thin plug using a thin plug molding device according to a seventh embodiment of the present invention.

FIG. 9 is a perspective view of a conventional molding tool.

FIG. 10 is a partially cutaway perspective view of a thin plug using a conventional molding tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower mold 11 Mold hole 12 Fixed holding part 13 Groove 14 Drilling 2 Upper mold 21 Mold hole 22 Groove 3 Fixing base 31A, 31B, 31C Protective wall 32 Through hole 33 Projection 34 Mortice 4 Conducting wire 41 Conductor 42 Plug foot 421 Circle hole 5 Orientation Parts 51 Lid 52 Irregular Body 6 Upper Lid 61 Irregular Body 7 Fixing Rod 8 Holder

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 45/00-45/84 B29C 33/12-33/18

Claims (9)

(57) [Claims] 1. A lower mold, an upper mold, and a fixed base, wherein the lower mold has a mold hole which is depressed at an appropriate depth at a central portion thereof, and the mold hole has a thinner end at one end. A plurality of fixed holding portions having an upper concave portion are provided, a groove is formed on a side edge of the other end, two perforations are formed at an appropriate location in the center, and the upper mold is covered with the lower mold. The lower mold has a shape corresponding to the lower mold, a recessed mold hole is provided in the center, a groove corresponding to the groove of the lower mold is molded at one end, and the fixing base has a protective wall having an appropriate height at an appropriate position. Is formed vertically according to the path of the conductor and the shape of the conductor, two through holes are opened at appropriate places, and a circular hole is formed vertically below the conductor connected to the ends of the two conductors. When the plug foot formed with the hole penetrates into the through hole, the conductor becomes Due to the limitation of the protective wall, it is in close contact with a predetermined position, the fixing base containing the conductive wire is placed in the mold hole of the lower mold, and after covering the upper mold, a plastic material is injected and a thin plug is formed. A thin plug molding device characterized by being molded. 2. The thin plug according to claim 1, wherein an upper lid is provided on the fixed base containing the conductive wire, and the fixed base and the upper lid are covered with a plastic material to be injected and are integrally molded. Molding equipment. 3. The thin plug molding tool according to claim 1, wherein a tenon or a projection is molded on a side surface of the protection wall of the fixing base to stably fix the conductor. 4. The thin plug molding device according to claim 1, wherein a movable fixing rod is provided at the bottom of the lower mold, and is fitted into the plug foot hole to be positioned. 5. The thin plug molding tool according to claim 1, wherein two holding members are provided on the bottom side of the lower mold, and the plug feet are pinched and positioned. 6. The thin plug according to claim 1, wherein a slight protrusion or a depression is formed at an appropriate position around the outside of the fixing base, and the fixing base and the solidified plastic material are firmly fixed. Molding equipment. 7. A localization component is mounted on the fixed base containing the conductor, and an irregular body is connected to the localization component on both sides of a bottom of the lid, and the irregular body adjusts the conductor. The thin plug molding tool according to claim 1, wherein the tool is pressed. 8. The thin plug molding tool according to claim 7 , wherein the localization component is formed by injecting and molding a different plastic material. 9. The thin type according to claim 7, wherein a luminescent body (cold light body) or another light emitting part is separately mounted on the localization part 5, and light is emitted by using a part of a plug power supply. Plug molding equipment.