JPS6320065Y2 - - Google Patents

Description

[Detailed description of the invention] [1] Technical field The present invention is compact, has high mechanical strength, and has a noise filter element embedded inside the integrally molded insulating plug body so that it can be easily assembled. The stored insulating cover is divided into two parts so that the two can be freely fitted with their hands together, and this insulating cover has an engaging leg that is inserted into an insulating base to which a ground terminal and a plug terminal are fixed, and a cord. The present invention relates to a plug with a built-in noise filter, which has a fixing part for fixing a connection terminal for connecting a wire core and a noise filter element, and a cord holding part for holding a cord.

[2] Background Art Generally, malfunction of equipment due to line noise generated in power input/output lines is a problem in industrial equipment, etc. Therefore, a noise filter for removing line noise is installed inside the equipment to prevent equipment from operating due to line noise. Measures are taken to prevent malfunction. However, noise is superimposed on the commercial power supply between the power outlet and the power cord to the device, and the power cord acts as an antenna for the noise, causing considerable side radiation effects. Such a power cord serves as an antenna, and in order to prevent noise from entering the device, various plugs with a built-in noise filter element are known. ing.

Conventional plugs with a built-in noise filter element include, for example, a plug terminal that is inserted into a power outlet, a cord that is connected to the device and whose terminal cord core is connected to the plug terminal, and a plug terminal and cord wire. A capacitor connected between the cores,
Or, a noise filter element consisting of a capacitor, inductance, etc., an insulating plug body made of plastic which is divided into two parts and encases the base of the plug terminal, the noise filter element and the cord terminal part, and a bolt that fixes the two halves of the plug body. There is a so-called assembly type plug, which is composed of a stopper such as a nut. There is also a so-called integrally molded plug, in which the base of the plug terminal, the noise filter element, and the cord end are enclosed in a molded plug body.

In the above configuration, the base of the plug terminal, the noise filter element, and the cord core are connected, and these are enclosed in the insulating plug body to incorporate the noise filter element, and this noise filter element prevents noise from being transmitted to the equipment. can prevent the intrusion of

However, in the case of conventional prefabricated plugs, the noise filter element and the plug body are fixed with a stopper, so the stopper may loosen during insertion or removal of the plug or during use, causing the noise filter element to become stuck inside the plug body. There is a risk that it may rattle and damage the wiring section or destroy the noise filter element itself. Furthermore, the impact force applied to the plug body is also applied to the noise filter element, which may easily break the noise filter element.

In addition, in the case of conventional integrally molded plugs, when molding the plug body, no special consideration is given to the positioning of the noise filter element embedded within the plug body. The noise filter element may not be located at a predetermined position within the plug body, and the noise filter element may be exposed from the outer surface of the plug body. Furthermore, due to the molding pressure when molding the plug body, there is a risk that the connections between the noise filter element and the plug terminal, cord, etc. may be disconnected or short-circuited, or the noise filter element itself may be destroyed. Furthermore, since the plug body is molded from plastic that is not very strong, pushing, pulling, twisting, and prying forces are applied to the plug body when it is inserted into and removed from an outlet, etc.
These forces affect the noise filter element itself and the connections between the noise filter element and the plug terminal and the cord, and there is a risk that the noise filter element may be destroyed or the connections may be disconnected.

Therefore, in order to solve these problems, the applicants first fixed the base of the plug terminal with an insulating base, and the insulating base, the noise filter element, and the cord terminal part were divided into two parts. We have proposed a plug with a built-in noise filter, which is installed inside the cover of the plug, and the plug body is integrally molded around the cover. This type of plug has a noise filter element etc. attached to the cover and the cover is surrounded by the plug body, so there is no misalignment of the plug terminals, noise filter element etc. during molding of the plug body. A plug can be easily and accurately manufactured.
In addition, internal parts such as the noise filter element are fixed inside the cover, and are enclosed in the integrally molded plug body to provide double protection, so there is no rattling of each component due to use, and the mechanical strength is increased. can be improved.

However, in the case of this type of plug with a built-in noise filter, the insulating base that fixes the plug terminal, the noise filter element, and the cord terminal part are mounted inside a cover, and the outside of this cover is made of vinyl chloride resin, etc. Since the plug body is made of plastic, the number of plug terminals is small, making it suitable for relatively small capacity plugs, but as the number of terminals increases and the capacity increases, the shape of the plug becomes larger. There is a fear. Not only does the larger the plug shape, the higher the cost of the plug itself, but when inserting the plug into a power outlet to obtain power, the protruding distance from the outlet surface to the end of the plug is long, making it difficult to place it indoors accordingly. It is necessary to move objects to create a large space for inserting and removing the plug, and there is also the risk of stopping the equipment receiving power supply or causing injury if the plug is hung on someone's foot, etc., and the shape of the plug As the plug increases, the pushing force, prying force, etc. when inserting the plug into the outlet increases, which may deform the receiving blade of the outlet and make it unusable. Also, standards for certain electrical appliances,
For example, 380V- in European CEE standard No.7
Plug standards for 25A or less specify the shape, dimensions, etc. of the plug, so if the plug shape becomes large as described above, there is a risk that it will not be able to comply with these standards.

[3] Purpose and structure of the invention This invention was made in view of the above,
In order to have a small size, high mechanical strength, and easy assembly, the insulating cover that houses the noise filter element has a two-part structure.
This insulating cover has an engaging leg that is inserted into the insulating base to which the ground terminal and plug terminal are fixed, a fixing part that fixes the connecting terminal for connecting the cord core and the noise filter element, and a cord holding part. The present invention provides an insertion plug with a built-in noise filter and a cord holding portion.

[4] Embodiment The noise filter built-in plug according to the present invention will be described in detail below.

1 and 2 show an embodiment of the present invention, with FIG. 1 being an external view of the plug, and FIG. 2 being an exploded perspective view showing the internal structure of the plug body. This plug has recesses 2, 2 on the top and bottom of the tip, protrusions 3, 3 on the left and right sides, and a cord protection part 4 on the rear end, and is integrally molded with plastic such as vinyl chloride resin. A pair of rod-shaped plug terminals 5, 5 having connecting ends 6, 6 are provided at a base located inside the plug body 1 and protruding from the distal end surface of the plug body 1.
A recess 2 is integrally formed by punching and pressing a metal conductive plate, and has a ground pin holder 8 disposed in a hole provided in the tip surface of the plug body 1 and a connecting terminal 9 buried within the plug body 1. , 2, one ground wire core 11 and two cord wire cores 12, 12 are twisted together and covered with an outer covering, one end of which is connected to the equipment side and the other end of which is connected to the equipment side. A cord 10 whose terminal end is inserted into the plug body 1 via the cord protection part 4, and the bases of plug terminals 5, 5 are fixed to both ends of the rectangular parallelepiped base body formed by molding plastic or the like. The plug has an insertion hole 14 having a substantially semicircular cross section on both sides of the base body, and has a protruding piece 15 for fixing the ground plate 7 provided on the other side of the base body, and is embedded in the plug body 1. an insulating base 13,
It has a pair of split covers 16a and 16b formed into a substantially box shape by plastic molding, etc., and both are fitted with their palms together to engage the insulating base 13. cover 16
Then, two insulated wire cores 19, which are divided into left and right parts from the approximately upper central part of the annular core 18 and extend to approximately the lower central part,
19 and four lead terminals 20, 20, 2 provided at each end of the two insulated wire cores 19, 19.
Connecting end 6 of plug terminal 5, 5 via 0, 20,
6 and the cord cores 12, 12 and fitted into the cover 16.
The lead end of the noise filter element 17 and the conductor of the cord core 12 are wound around the recess, and the plug is fixed to the outside of the cover 16 and embedded in the plug body 1. A pair of connection terminals 21, 21 are connected to each other. Here, one split cover 16 of the cover 16
a is a noise filter element 1 provided approximately in the center;
an element placement portion 30 in the form of a substantially circular concave portion into which 7 is inserted;
A projecting piece 31 provided on the periphery of the element arrangement portion 30 and fitted into the other divided cover 16b, and four lead terminals 20, 20, 20, 20 of the noise filter element 17 provided above and below the projecting piece 31, respectively. Grooves 32, 32, 32, 32 for penetrating the
A base 33 is provided protruding from the front end surface, and the distance becomes smaller toward the tip because it is provided protruding from the base 33 so as to be located in the center of the tip surface of the cover 16 and is inserted into the insertion holes 14, 14 of the insulating base 13. A pair of engaging legs 3 having a substantially semicircular cross section tapered as shown in FIG.
4, 34, and a cord holding portion 35 having a substantially semicircular cross section and protruding from the rear end surface for holding the cord 10.
, cord core draw-out ports 36 , 36 provided on both sides of the base of the cord holding portion 35 for pulling out the cord wire cores 12 , 12 , and cord wire core draw-out ports 36 , 36 provided on the rear end face where the cord holding portion 35 is provided for connecting the connecting terminals 21 , 21 . It has a pair of terminal insertion grooves 37, 37 for insertion,
Further, the other divided cover 16b includes an element arrangement part (not shown) in the shape of a substantially circular concave part provided approximately at the center and into which the noise filter element 17 is fitted, and the other divided cover provided at the periphery of this element arrangement part. A fitting recess (not shown) into which the protruding piece 31 of the split cover 16a is fitted, and a cylinder that protrudes from the rear end surface and pairs with the cord holding portion 35 of the other split cover 16a to increase the bending radius of the cord 10. a cord holding part 45 having a substantially semicircular cross section forming a cord holding part 45; a ground wire core pull-out groove 46 provided in the cord holding part 45 for drawing out the ground wire core 11; It has a ground wire core fixing groove 47 for accommodating the service wire core 11, and the divided covers 16a and 1
6b is fitted in a state where the palms are joined together by fitting the projecting piece 31 into the fitting recess. Note that the split cover 16a
The base 33 provided in the split covers 16a and 1
This is to make the engaging legs 34, 34 protrude from the center of the cover 16 when the cover 6b is fitted.
4 and 14, the cover 16 is connected to the center of the insulating base 13.

In the above configuration, when the plug terminals 5, 5 connected to the device via the cord 10 are inserted into a power outlet etc., the device is grounded via the grounding wire core 11 and the grounding plate 7, and the plug The noise filter element 17 connected in series between the terminals 5, 5 and the cord cores 12, 12 can easily and accurately prevent line noise from entering the device via the power outlet and the cord 10.

Next, a manufacturing procedure for such a plug with a built-in noise filter element will be explained. First, split cover 16
The noise filter element 17 is placed in the element arrangement section 30 of a.
into the grooves 32, 32, provided in the projecting piece 31.
The lead terminals 20, 20, 20, 20 of the noise filter element 17 are inserted into the holes 32, 32, respectively. Each wire core 11, 12 of the cord 10 is exposed for a predetermined length, and the cord wire cores 12, 12 are split into a cover 16a.
1, and fit the protruding pieces 31 of the split cover 16a into the fitting recesses of one of the split covers 16b to fit the split covers 16a and 16b together. let The cord wire cores 12, 12 and the lead terminals 20, 20 of the noise filter element 17 are wound around each connecting terminal 21, 21 and connected by soldering etc., and the connecting terminals 21, 21 are connected to the divided cover 16a.
are inserted into the respective terminal insertion grooves 37, 37 and fixed.
The split cover 1 is inserted into the insertion holes 14, 14 of the insulating base 13 to which the plug terminals 5, 5 and the ground plate 7 are attached.
The respective engaging legs 34, 34 of 6a are inserted and locked. Split cover 16b for ground wire core 11 of cord 10
The ground wire core is pulled out from the ground wire core pull-out groove 46, inserted and fixed into the ground wire core fixing groove 47, and connected to the connection terminal 9 of the ground plate 7 fixed to the insulating base 13 by soldering or the like. Further, the lead terminals 20, 20 of the noise filter element 17 are connected to the connecting ends 6, 6 of the plug terminals 5, 5 by soldering or the like. After that, the plug body 1 and the cord protection part 4 are molded from a front end of the insulating base 13 to the terminal part of the cord 10 using plastic such as vinyl chloride resin. At this time, the plug body 1 is formed with recesses 2, 2 on the top and bottom and protrusions 3, 3 on the left and right sides for exposing the ground plate 7 fixed to the insulating base 13.
This completes the work.

In the case of the above-mentioned plug, the noise filter element 17 is fitted into the split cover 16a, and the lead terminals 20,
20, 20, 20 into the grooves 32, 32, 32, 32 provided in the split cover 16a, respectively, and then insert one of the split covers 16 into the split cover 16a.
Since the split cover 16 is made to fit
The gap connected to the element arrangement section 30 inside the elements a and 16b is the lead terminal 20 of the noise filter element 17.
There are no grooves other than the groove 32 that leads out the lead terminal 20, and the lead terminal 20 is inserted into this groove 32.
When forming the plug body 1 by molding with vinyl chloride resin, etc., the plastic is used as the cover 1.
All routes flowing into 6 are eliminated. Since the plug body 1 is formed by sealing the noise filter element 17 with the pair of split covers 16a, 16b, the resin for molding the plug body 1 flows into the split covers 16a, 16b element placement portion 30. do not. Therefore, damage to the noise filter element 17 and damage to the lead terminals 20 due to the temperature and pressure of the inflowing resin can be prevented. Here, the cord wire cores 12, 12 and the noise filter element 1
The connecting portions with the lead terminals 20, 20 of 7 are fixed to the outside of the cover 16, and the cord core 12 is placed outside the cover 16, and only the noise filter element 17 is placed inside the cover 16. cover 16
The engaging legs 34, 34 are provided on the engaging legs 34, 3.
4 are inserted into the insertion holes 14, 14 of the insulating base 13, and the cover 16 is engaged with the insulating base 13. Therefore, the cover 16 can be made smaller, and thereby the outer shape of the plug itself can be made smaller. Since the external shape of the plug itself can be made smaller in this way, when the plug is inserted into an outlet, the length of the plug that protrudes from the outlet surface is reduced, making it easier to use and reducing the pressure and prying force required when inserting the plug into the outlet. Not only will the receiving blade of the outlet not be damaged by force, etc., but costs can be reduced by making the outer shape of the plug smaller. In particular, since the cover 16 is engaged with the insulating base 13 by inserting the engaging legs 34, 34 provided on the cover 16 into the insertion holes 14, 14 of the insulating base 13, the outer shape of the plug is increased as described above. Not only can you create a plug without having to remove the noise filter element 1, but you can also use the cover 16 for plugs that meet certain standards, such as the CEE standard No. 7.
7 can be built-in. Also, the insulation base 1
3 and the cover 16, the engagement legs 34 of the insulating cover 16 are inserted into the insertion holes 14, 14 of the insulating base 13.
34, the insulating base 13
This simplifies the work of attaching the cover 16 to the cover 16, and since the pair of engagement legs 34, 34 of the cover 16 are tapered so that the distance between them becomes smaller toward the tip, the engagement legs 34, 34 can be inserted into the insertion hole. The engagement force between the plugs 14 and 14 when inserted is large, so that the plug body 1 is not disengaged by the molding pressure when molding the plug body 1, and the plug can be accurately manufactured. In addition, in order to attach the cord 10 to the cover 16, the cord holding parts 35, 45 protruding from the outside of the cover 16 are provided with cord core pull-out openings 36, 36 and a ground wire core pull-out groove 46. In order to not only reduce the size but also bend the cord 10 and relieve the tensile force applied to the cord 10, the cord cores 12, 12 are connected to the cord core outlet ports 36, 36.
At the same time, the grounding wire 11 is also taken out and bent through the grounding wire pulling groove 46 and placed on the front surface of the cover 16.
Since the plug body 1 covers the outside of the cord 10, the tensile force applied to the cord 10 does not directly apply to the cord core arrangement section or the connection section.
The tensile force is relaxed, so no tensile force is applied to the noise filter element 17 and its lead terminals 20, and damage to the noise filter element 17 and its lead terminals 20 can be prevented. Moreover, the cord wire cores 12, 12 and the lead terminals 20, 20 of the noise filter element 17 are connected to the connecting terminals 21, 21, and the connecting terminals 21, 21 are inserted into the terminal insertion grooves 37, 37 provided on the outside of the cover 16. Since it is inserted and fixed and covered by the plug body 1, the connection between the cord cores 12, 12 and the lead terminals 20, 20 is more firmly fixed, and the connection is prevented from being damaged by tensile force during use of the plug. Disconnection or noise filter element 17
Damage to the product can be prevented. Furthermore, code 10
The terminal part of is held by the cord holding parts 35, 45,
Since this outside is covered with a cord protection part 4 molded from the same resin as the plug body 1, the cord 1
The bending radius of the cord 10 is increased, and breakage due to bending of the cord 10 can be prevented when the plug is used, and the life of the cord protection part 4 is also extended.

Note that although the noise filter element 17 in the above embodiment is composed of an inductance, other configurations,
For example, it may be composed of a capacitor, or a capacitor and an inductance, and its shape is not limited to a ring shape, but may be other shapes such as a rectangular parallelepiped shape. Therefore, the shape of the insulating cover that houses this can also be modified in various ways.

[5] Effects of the invention As explained above, according to the plug with a built-in noise filter of the invention, the insulating cover that houses the noise filter element has a two-part structure, and the insulating cover has a ground terminal and a plug. The insulating cover is equipped with an engaging leg that is inserted into the insulating base on which the terminal is fixed, a fixing part that fixes the connecting terminal for connecting the cord core and the noise filter element, and a cord holding part that holds the cord. The shape of the plug itself can be made smaller by making it smaller. This not only improves usability, but also reduces the pushing and prying force required when inserting into an outlet, which prevents damage to the receiving blade of the outlet, and reduces manufacturing costs due to miniaturization. Furthermore, by inserting the engaging legs into the insulating base, the insulating cover can be engaged with the insulating base, which simplifies assembly, and also allows the connection fixing part of the cord core and noise filter element to be connected to the cord holding part. Because of this provision, the mechanical strength against tensile force is increased and it is possible to prevent disconnection accidents and damage to the noise filter element.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is an external view of a plug with a built-in noise filter, and Figure 2 is an exploded view of the internal structure of the plug body in Figure 1. FIG. Explanation of symbols, 1... Plug body, 4... Cord protection section, 5... Plug terminal, 7... Earth plate, 8
...Earth pin bracket, 10...Cord, 11...
...Earth wire core, 12...Cord wire core, 13...
Insulating base, 14...Insertion hole, 16...Insulating cover, 16a, 16b...Divided cover, 17...Noise filter element, 30...Element placement part, 31...
... Projection piece, 32 ... Groove, 34 ... Engagement leg, 35, 4
5... Cord holding portion, 36... Cord wire core outlet, 37... Terminal insertion groove, 46... Earth wire core pull-out groove, 47... Earth wire core fixing groove.

Claims (1)

[Claims for Utility Model Registration] (1) An insulating base on which a grounding terminal connected to the grounding core of the cord and a plug terminal are fixed, and an insulating base connected between the plug terminal and the cording core of the cord. An insertion plug with a built-in noise filter, comprising an insulating cover that accommodates a noise filter element and engages with the insulating base, and the insulating base, the cover, and the end of the cord are enclosed in an integrally molded insulating plug body. , an insertion hole is provided in the insulating base, and the insulating cover embedded in the plug body has a pair of split covers that can be fitted in a state of folding hands;
One end of the pair of split covers is provided with an engaging leg that is inserted into the insertion hole of the insulating cover, and the other end is provided with a fixing portion for fixing a connecting terminal for connecting the cord core and the noise filter element. A plug with a built-in noise filter, characterized in that it is provided with a cord holding part that holds a cord core and a grounding core. (2) The noise according to claim 1 of the utility model registration claim, characterized in that the fixing part for fixing the connecting terminal is provided outside the insulating cover, and the connecting terminal is held between the fixing part and the plug body. Plug with built-in filter. (3) The cord holding portion has a cylindrical shape, and has a wire core draw-out port on a side wall thereof for pulling out the cord wire core;
The plug with a built-in noise filter according to claim 1, which is characterized by having a wire core pull-out groove for pulling out the ground wire core.