JP4678851B2 - Plug - Google Patents

Description

  The present invention relates to an insertion plug provided at the tip of a power cord.

  In general, a power cord connected to a three-pole plug having a grounding electrode is formed by converging three wires, and thus has a large diameter. As a structure for fixing the power cord having a large diameter to the plug plug case, for example, a cord receiving portion is formed inside an insertion opening formed on one side surface of the case, and the power cord is applied to the cord receiving portion. The power cord is clamped and fixed by pressing it with a horizontally long pressing plate, inserting a fixing screw into both ends of the pressing plate, and screwing it into a screw hole formed on the inner surface of the case (for example, patent Reference 1).

JP-A-2005-135615

  The diameter of the power cord connected to the plug may vary depending on the power consumption of the electrical equipment. With conventional plugs, the tightening force varies depending on the thickness of the power cord, and the thin power cord is fixed. In some cases, the tightening force may be weak, and if the cord part is pulled, there is a risk of disconnection due to the force applied to the connection part with the blade, and if a thick power cord is fixed, the cord part may be overtightened. May be crushed and damage the core wire.

  According to the first aspect of the present invention, the plug blade protrudes from one side surface of the case, and the power cord insertion port that is electrically connected to the plug blade is formed on the other side surface. The power cord inserted into the insertion opening is pressed against the cord receiving portion formed on the inner surface of the case by the pressing plate whose cord contact portion is formed in a substantially arc shape, and is inserted into the screw insertion holes formed at both ends of the pressing plate. In a plug that is inserted through a fixing screw and screwed into a screw hole formed on the inner surface of the case, and the power cord is clamped and fixed, the height of the cord abutting portion of the holding plate with respect to the cord receiving portion is the power cord It is characterized in that it is formed so as to become smaller stepwise in the insertion direction.

  According to a second aspect of the present invention, in the plug according to the first aspect, a slip stopper is provided on one or both of the cord contact surfaces of the pressing plate and the cord receiving portion.

According to the third aspect of the present invention, in the insertion plug according to the first or second aspect, the screw insertion hole of the holding plate is formed into an elongated hole shape in the insertion direction of the power cord, and the fixing screws on both sides are formed. It is characterized by being fixed so as to hold the power cord on the straight line to be connected.

  According to the first aspect of the present invention, there is an effect that power cords having different diameters can be fixed with the same tightening force.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, there is an effect that the fixing of the power cord can be strengthened.

  According to the third aspect of the present invention, in addition to the effect of the first or second aspect of the invention, the power cord can be pressed on a straight line connecting the fixing screws on both sides and can be fixed securely. There is an effect.

  The insertion plug forms a cord receiving part for placing the power cord inside the insertion opening for inserting the power cord formed on the base with the plug blade protruding, and is arranged facing the cord receiving part The cord abutting portion formed in a substantially arc shape of the holding plate to be formed is formed in three stages so that the height with respect to the cord receiving portion is gradually reduced in the insertion direction of the power cord. In addition, screw insertion holes are formed at both ends of the pressing plate, and screw holes are formed on both the left and right sides of the cord receiving portion facing the screw insertion holes. For the power cord, select a location that matches the diameter from the multiple-stage cord abutting section of the retainer plate, press it against the cord receiving section, insert the fixing screw through the screw insertion holes on both sides, and screw it into the screw holes. As a result, the power cord is clamped and fixed between the holding plate and the cord receiving portion.

  A first embodiment of the plug according to the present invention will be described with reference to the accompanying drawings of FIGS.

  In the plug 1, a base 2 and a cover 3 constitute a case. In the case of a three-pole type, two flat-type plug blades 5 are provided on one side surface of the base 2 so as to protrude from each other. One substantially U-shaped plug blade 6 that protrudes from the plug blade 5 and forms a ground electrode is provided.

  Further, semi-circular portions are cut out on the surfaces where the base 2 and the cover 3 are joined, and an insertion port 9 is formed through which the power cord 7 is inserted into a circular shape when joined. The insertion opening 9 of the base 2 is formed with a cord receiving portion 10 in which a semicircular portion extends in the inner direction and the power cord 7 is disposed.

  The horizontally long pressing plate 12 arranged to face the cord receiving portion 10 has a central cord abutting portion 13 formed in an arc shape, and the cord abutting portion 13 is inserted into the power receiving cord 7 at a height relative to the cord receiving portion 10. It is formed in three stages so as to decrease stepwise in the direction. In addition, screw insertion holes 14 through which the fixing screws 15 are inserted are formed at both ends. And the screw hole 11 which the fixing screw 15 screws together is formed in the both sides of the code | cord | chord receiving part 10 which opposes the screw insertion hole 14 of the holding | suppressing board 12. As shown in FIG.

  In order to fix the power cord 7 to the insertion plug 1 formed in this way, first, the cover 3 is removed from the base 2, and the diameter of the power cord 7 is adjusted from the plurality of cord contact portions 13 of the holding plate 12. A matching portion is selected, and the tip portion of the cord portion 7 a of the power cord 7 is aligned therewith and pressed against the cord receiving portion 10. That is, the thick power cord 7 reduces the amount of insertion from the insertion port 9 and is pressed by the cord abutting portion 13 at a position close to the insertion port 9, while the thin power cord 7 increases the amount of insertion from the insertion port 9 and is inserted. The cord is pressed by the cord abutting portion 13 at a position far from the mouth 9. Then, the fixing screw 15 is inserted into the screw insertion holes 14 on both sides and screwed into the screw holes 11, whereby the power cord 7 is sandwiched and fixed between the pressing plate 12 and the cord receiving portion 10. After fixing the power cord 7 in this way, the electric wires 7b in the power cord 7 are electrically connected to the corresponding plug blades 5 and 6, and when the connection is completed, the cover 3 is attached to the base 2.

  In this embodiment, the three-pole plug is described. However, it can be applied to a two-pole plug. Further, the fixing of the power cord can be strengthened by providing a slip stopper on one or both cord contact surfaces of the pressing plate and the cord receiving portion. Further, in this embodiment, the cord contact portion of the pressing plate has three stages, but any number of stages may be used as long as there are a plurality of stages, and other shapes and structures are appropriately set within the scope of the present invention. It is also possible to change and implement.

  A second embodiment of the plug according to the present invention will be described with reference to the accompanying drawings of FIGS.

  The insertion plug 21 forms a case with a base 22 and a cover 23. In the case of a three-pole type, two flat-type plug blades 25 are provided on one side surface of the base 22 so as to protrude from each other. One substantially U-shaped plug blade 26 that protrudes from the plug blade 25 to form a grounding electrode is projected.

  In addition, semicircular portions are cut out on the surface where the base 22 and the cover 23 are joined, and an insertion port 29 is formed into a circular shape when the power cord 27 is inserted. The insertion opening 29 of the base 22 is formed with a cord receiving portion 30 in which a semicircular portion extends in the inner direction and the power cord 27 is disposed.

  The horizontally long pressing plate 32 arranged to face the cord receiving portion 30 has a central cord abutting portion 33 formed in an arc shape, and the cord abutting portion 33 is inserted into the power receiving cord 27 at a height with respect to the cord receiving portion 30. It is formed in three stages so as to decrease stepwise in the direction. In addition, screw insertion holes 34 through which the fixing screws 35 are inserted at both ends are formed in a long hole shape that is long in the insertion direction of the power cord 27. The screw holes 31 into which the fixing screws 35 are screwed are formed on both sides of the cord receiving portion 30 facing the screw insertion holes 34 of the presser plate 32.

  In order to fix the power cord 27 to the insertion plug 21 formed in this way, first, the cover 23 is removed from the base 22, and the diameter of the power cord 27 is adjusted from the plurality of cord abutting portions 33 of the pressing plate 32. A matching portion is selected, and the tip portion of the cord portion 27 a of the power cord 27 is aligned therewith and pressed against the cord receiving portion 30. Then, the fixing screw 35 is inserted into the screw insertion holes 34 on both sides, and the position of the holding plate 32 is adjusted so that the position of the cord receiving portion 30 holding the power cord 27 is aligned with the straight line connecting the fixing screws 35 on both sides. Then, by fixing the fixing screw 35 to the screw hole 31, the power cord 27 is sandwiched and fixed between the pressing plate 32 and the cord receiving portion 30. That is, when fixing the thick power cord 27, the power cord 27 is pressed by the cord abutting portion 33 at a position near the insertion opening 29 as shown in FIG. 5, and then the holding plate 32 is separated from the insertion opening 29. When the thin power cord 27 is fixed, the power cord 27 is pressed by the cord abutting portion 33 located far from the insertion port 29 as shown in FIG. It will be fixed at a position close to 29. After fixing the power cord 27 in this manner, the electric wires 27b in the power cord 27 are electrically connected to the corresponding plug blades 25 and 26, and when the connection is completed, the cover 23 is attached to the base 22.

  As described above, by making the screw insertion hole 34 of the pressing plate 32 into a long hole shape, the power cord 27 can be pressed on a straight line connecting the fixing screws 35 on both sides, and can be fixed securely.

  In this embodiment, the three-pole plug is described. However, it can be applied to a two-pole plug. Further, the fixing of the power cord can be strengthened by providing a slip stopper on one or both cord contact surfaces of the pressing plate and the cord receiving portion. Further, in this embodiment, the cord contact portion of the pressing plate has three stages, but any number of stages may be used as long as there are a plurality of stages, and other shapes and structures are appropriately set within the scope of the present invention. It is also possible to change and implement.

It is a disassembled perspective view which shows the insertion plug which concerns on Example 1 of this invention. It is the front view of the state which showed the state which fixed the power cord to the insertion plug which concerns on Example 1 of this invention, and removed the cover. It is a disassembled perspective view which shows the insertion plug which concerns on Example 2 of this invention. It is the front view of the state which showed the state which fixed the power cord to the insertion plug which concerns on Example 2 of this invention, and removed the cover. It is the front view of the state which showed the state which fixed the thick power cord to the insertion plug which concerns on Example 2 of this invention, and removed the cover. It is the front view of the state which showed the state which fixed the thin power cord to the insertion plug which concerns on Example 2 of this invention, and removed the cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug 2 Base 7 Power cord 10 Cord receiving part 11 Screw hole 12 Holding plate 13 Cord contact part 14 Screw insertion hole 15 Fixing screw

Claims (3)

  A plug blade protrudes from one side of the case, and a power cord insertion port electrically connected to the plug blade is formed on the other side surface, and the power cord inserted into the insertion port is in contact with the cord. The inner surface of the case is pressed by a cord receiving portion formed on the inner surface of the case by a pressing plate having a substantially arc-shaped portion, and a fixing screw is inserted into screw insertion holes formed at both ends of the pressing plate. In the insertion plug formed by screwing into the screw hole formed in the pin and sandwiching and fixing the power cord, the height of the cord abutting portion of the pressing plate with respect to the cord receiving portion is stepped in the insertion direction of the power cord An insertion plug characterized in that it is formed to be small.   The plug according to claim 1, wherein a slip stopper is provided on one or both of the cord contact surfaces of the pressing plate and the cord receiving portion. The screw insertion hole of the holding plate is formed in a long hole shape that is long in the insertion direction of the power cord, and fixed so as to hold the power cord on a straight line connecting the fixing screws on both sides. The plug according to claim 1 or claim 2.

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