JP2017199482A - Plug structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug structure having a body structure provided with a ground line connecting terminal portion capable of connecting a grounding pole of a three pole plug of a load device to an external grounding pole even in a case where a socket has no grounding pole.SOLUTION: A plug 10 has a body in which a plug blade 25a protrudes from a predetermined surface 20b4 and a receptacle is disposed on a surface other than the predetermined surface. In the interior of the body, the grounding electrodes of the conductor constituting the plug blade and the conductor constituting the receptacle are electrically connected to each other by a conductor 71. A grounding terminal disposing portion capable of connecting an electric wire line from the outside of the body to the conductor 71 is provided on a part of the conductor connecting the grounding electrodes.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plug having a plug blade on a main body. In particular, the present invention relates to a plug having a main body with an outlet for supplying electric power obtained from the plug blade to a load-side electric circuit.

  A plug that inserts and connects a plug blade into an outlet provided in a construction material or the like and supplies power to a load-side electric circuit is well known. On the other hand, a plug having a function of selectively switching the power supply to the load-side electric circuit inside the plug body or a function of detecting a leakage in the electric circuit and cutting off the power supply to the electric circuit is disclosed in, for example, a patent An earth leakage breaker with a plug blade as disclosed in Document 1 and an earth leakage protection plug as disclosed in Patent Document 2 are known. Further, a plug provided with a mechanism capable of increasing or decreasing the number of plug blades corresponding to the wiring form of the outlet inside the plug body is a 2P3P combined plug as disclosed in Patent Document 3 (2P is 2-pole, 3P is 2) Known as having a polar ground terminal).

  The earth leakage circuit breaker with a plug blade of Patent Document 1 electrically connects an outlet and a load device, and when an electric leakage occurs in the load device, the earth leakage is detected instantaneously to interrupt energization of the load device. The earth leakage protection plug of Patent Document 2 includes a grounding electrode, and can detect a ground fault due to insulation deterioration of a load device.

In the plug of Patent Document 3, the outer periphery of the main body is provided so as to be rotatable with respect to the inside, and the number of plug blades is increased or decreased by displacing the position of the plug blade of the ground electrode in conjunction with the rotation operation of the outer periphery. A form that can be connected to both a three-pole outlet with a grounding pole and a two-pole outlet without a grounding pole is configured.

Japanese Utility Model Publication No. 63-079043 JP 2002-216613 A JP 2013-45634 A

  As described above, the power supply switching function inside the plug body, the one with the function of detecting the electric leakage in the electric circuit and cutting off the electric power supply to the electric circuit, the number of plug blades to the presence or absence of the ground electrode A plug having an additional function having a function to increase or decrease correspondingly is known, but it is important to connect the grounding electrode securely in order to detect a leakage particularly for the purpose of ground fault protection.

  According to the internal regulations, it is obliged to connect the grounding electrode securely in a special-purpose outlet, and it is also recommended in other outlets. At present, it is in the process of spreading, and there are still many outlets that do not have a grounding electrode.

  For this reason, grounding protection can be performed when the plug of the outlet and the load device is a three-pole type. However, when the outlet is a two-pole type, the ground electrode is separately connected to the three-pole plug of the load device. It is necessary to provide fault protection.

  Further, in the plug disclosed in Patent Document 2, when an outlet with a ground wire connection terminal to which a ground pin is not inserted and the ground wire connection terminal is added is used instead of the ground pin, a load device is used. A configuration is disclosed in which a ground wire is provided on the plug body so that the ground wire can be connected. On the other hand, when the ground wire is not used, the ground wire is exposed to the outside and the end portion is electrically opened, so that the appearance is deteriorated and electrical safety such as insulation treatment is performed on the open end. A separate effort is required. There is also a risk of electric shock if the ground electrode is connected to the voltage electrode by mistake.

  In view of the above points, the present invention provides a main body structure including a ground wire connection terminal portion that can connect a ground electrode of a three-pole plug of a load device to an external ground electrode even when the outlet does not have a ground electrode. It aims at providing the plug structure which has this.

  The plug structure of the present invention is a plug having a main body in which a plug blade protrudes from a predetermined surface and an outlet is disposed on a surface other than the predetermined surface, and the plug blade is configured inside the main body. While the conductors and the ground poles in the conductor constituting the outlet are electrically connected by the conductor, the conductor may be connected to a part of the conductor connecting the ground poles from the outside of the main body. It is characterized by having a ground terminal arrangement portion that can be formed.

  Thereby, since the conductor constituting the plug blade and the conductor constituting the outlet are connected to the part of the conductor connecting the grounding electrodes, the ground terminal arrangement portion that can connect the electric wire from the outside of the main body is provided. Even when the outlet does not have a ground electrode, the ground electrode of the three-pole plug of the load device can be electrically connected to the external ground electrode by connecting an electric wire from the outside of the main body to the ground terminal arrangement portion. .

  In addition, the ground terminal arrangement portion is arranged so that a part thereof is exposed in the protruding direction of the plug blade on the predetermined surface, and the operation portion of the ground terminal arrangement portion is arranged along the protruding direction. May be configured as a feature.

As a result, when connecting an electric wire from the outside of the main body to the ground terminal arrangement part, it is essential to remove the plug main body from the outlet.For example, when a voltage line is mistakenly connected to the ground electrode. The possibility of electric shock can be avoided.

  Further, the periphery of the ground terminal arrangement portion may be formed to be recessed from a predetermined surface on which the plug blade protrudes, and may be formed to be open only in one side surface direction.

  Thereby, the connected electric wire can be pulled out from the open portion while concealing the ground terminal arrangement portion from the surroundings to improve the appearance.

  According to the present invention, there is provided a plug having a main body structure including a ground wire connection terminal portion capable of connecting a ground pole of a three-pole plug of a load device to an external ground pole even when the outlet does not have a ground pole. Can be provided.

It is an external view of the plug which concerns on this embodiment. It is an external view of the plug which concerns on this embodiment. It is the schematic which connected the plug to the outlet. It is a figure explaining the connection of the grounding poles of a plug. It is the schematic when a plug main body is divided | segmented. It is the figure which decomposed | disassembled the component regarding a 1st outlet part and a 2nd outlet part while showing the structure inside a main body. It is the figure which showed the prior art example. It is the figure which showed the prior art example. It is the figure which showed the prior art example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following preferred embodiments are merely exemplary in nature and are not intended to limit the invention, its scope of application or its uses.

(Outline of the plug)

  The plug 10 according to the present embodiment is a plug that is used by being plugged and connected to an outlet 200 (referred to as a primary side outlet for distinction) arranged in a construction material or the like. The main body of the plug 10 is provided with outlets 31 and 33 (referred to as secondary outlets for distinction), and the load of the load device or the like is inserted into the outlet of the main body of the plug 10 and connected thereto. Supply power to equipment.

  In addition, if a leakage occurs in the main body of the plug 10 due to insulation deterioration of the load device or electrical wiring, this is detected instantaneously and the supply of power from the primary outlet 200 to the load device is cut off. The earth leakage detector and the breaking mechanism are accommodated, and the plug 10 as a whole constitutes a plug-type earth leakage breaker.

  In particular, the plug 10 is a plug having three plug blades in total, that is, each of the plug blades 25a connected to the voltage phase and the neutral phase, and the plug blade 25b (referred to as a ground pin) connected to the ground electrode. The primary-side outlet 200 is a plug that can be used both in the case of a three-pole outlet with a ground pin insertion hole and in the case of a two-pole outlet without a ground pin insertion hole.

  In the following, in a state where the plug 10 is inserted into the primary outlet 200, the surface of the plug 10 facing the front side is referred to as “front surface”, and the surface facing the outlet is referred to as “rear surface”. The directions of “up”, “down”, “left”, and “right” are defined based on the state where the plug 10 is inserted into the outlet.

  As shown in FIG. 1, the plug 10 includes a plug body 20 having a substantially cylindrical shape having a size (for example, 110 × 50 × 55 mm) that can be held by a user (operator) with one finger. The plug main body 20 accommodates contents such as the leakage detecting portion and a blocking mechanism.

  The outer shape of the main body of the plug 10 has a substantially cylindrical shape formed by a base portion 20b2 having a plug blade on a predetermined surface and content storage portions 20b1 and 20a connected to the base portion 20b2.

  The base portion 20b2 is formed to have a width (for example, 30 mm) enough to include a plug blade. The content container 20b1 connected to the base 20b2 is formed to have a width (for example, 50 mm) larger than the base 20b2.

  Due to the difference in the widths, a step 20b3 is formed in the main body 20 of the plug 10. By this step portion 20b3, a finger hook portion can be provided in the main body as an outer shape, and a grip portion of the main body 20 of the plug 10 is formed in combination with the shape of the substantially cylindrical shaped content storage portions 20a and 20b. .

  On the other hand, the step portion 20b3 is provided with a finger storage portion 20b4 for storing a finger that holds the main body 20 in the protruding direction of the plug blade. The finger storage portion 20b4 is formed by a recess formed between the left and right side portions of the base portion 20b2 and the left and right side portions of the content storage portion 20b.

  Since the width of the left and right side surfaces of the base portion 20b2 is smaller than the width of the content container 20 in the left-right direction, when the periphery of the content container 20 is gripped with fingers, Fingers are stored. The fingertips are positioned on the left and right side surfaces of the base portion 20b2, so that the main body 20 can be firmly grasped, and the fingertips are prevented from reaching the rear surface of the base portion 20b2.

  Outlets 31 and 33 provided on the lower portion and the lower surface (bottom surface) of the front surface of the main body 20 of the plug 10 are three-pole outlets that serve as connection ports with load devices. Blade holders 82 and 83 connected to the voltage phase, blade holders 86 and 87 connected to the neutral phase, and blade holders 94 and 96 serving as ground electrodes are provided.

  The ground pins 25b and the blade supports 94 and 96 serving as ground electrodes are electrically connected by conductors inside the plug body 10 so as to be electrically at the same potential.

  Specifically, a ground terminal screw 98a is screwed to one end of the ground terminal plate 91 serving as a ground terminal arrangement portion, and the other end of the ground terminal plate 91 is vertically and horizontally inside the main body 10 and is connected to the ground pin. A screw 98c for screwing the conductor 71 extending in the direction and the ground terminal plate 91 is provided, and the end of the conductor 71 and the ground pin 25b are electrically connected by a lead wire, thereby It is connected to the.

  The ground terminal plate 91 serving as the ground terminal placement portion is disposed such that a part thereof is exposed toward the rear surface in the projecting direction of the plug blade 25a on the predetermined surface 20b4. In other words, the screw 98c screwed to the ground terminal plate 91 has a screw head as an operation portion arranged along the protruding direction of the plug blade 25a.

  Further, the periphery of the ground terminal plate 91 serving as the ground terminal arrangement portion is formed to be recessed from a predetermined surface 20b4 on which the plug blade 25a projects. Further, the left side direction is opened to form the base portion 20b2.

  Hereinafter, the structure of the main body 20 of the plug 10 will be described in detail.

  The main body 20 of the plug can be separated front and rear at the center portion in the front and rear direction, and FIG. 5 shows a state where the plug main body 20 is separated front and rear.

  The plug body 20 includes a front cover 20a constituting the front half and a rear cover 20b constituting the rear half. The front cover 20a has a bottomed box shape that opens to the rear side, and the rear cover 20b has a bottomed box shape that opens to the front side. Further, an engagement claw 20c is provided at the left end of the front cover 20a, and an engagement recess 20d that can be engaged with the engagement claw 20c is provided at the rear cover 20b at a position corresponding to the engagement claw 20c. It has been. Then, the engaging claw portion 20c of the front cover 20a and the engaging concave portion 20d of the rear cover 20b are engaged with each other with the openings of the covers 20a and 20b abutting each other. As a result, the covers 20a and 20b are integrally assembled to form the plug body 20, and a closed space is formed therein. After the assembly, the front cover 20a and the rear cover 20b are screwed and fixed at four corners on the rear surface side of the rear cover 20b by tapping screws (not shown).

  Hereinafter, the plug body 20 simply refers to the plug body after the screwing and fixing. That is, the plug body 20 after screwing and fixing is a front wall portion formed of the bottom wall of the front cover 20a, a rear wall portion disposed on the rear side of the front wall portion and formed of the bottom wall of the rear cover 20b, It consists of surrounding walls of both the front cover 20a and the rear cover 20b, and has four side walls that connect the front wall and the rear wall. The said side wall part is comprised by the up-and-down and right-and-left wall part. The covering wall part is composed of a front wall part and four side wall parts.

  Although not shown, the leakage protection unit 50 includes a leakage detection unit that detects leakage, and a connection blocking unit that blocks connection between the input and output of the plug when the leakage detection unit detects overcurrent / leakage. . Conventional configurations can be applied to the configurations of the leakage protection unit and the connection blocking unit, and detailed description thereof is omitted here.

  On the rear wall portion of the main body 20 of the plug, an insertion plug 25 made up of two electrode plugs 29 and 29 and a ground plug 27 protrudes from a position near the upper end. A crimp terminal 26 having a function of a ground terminal of the plug 10 is provided at the lower left corner of the same rear wall. The plug 10 is configured to electrically connect the outlet and the load device by inserting the plug 25 into the outlet and inserting the plug of the load device into the three-pole outlet portions 31 and 31 described later.

  A push-type ON button 23 and a test button 24 are arranged in the order of description on the front wall portion of the plug main body 20 in the vertical and horizontal directions. The ON button 23 is a switch that turns on the supply of commercial power to a load device (sets the connected state). The test button 24 turns off the supply of commercial power to the load device in order to check whether the plug 10 operates normally (that is, whether the supply of commercial power to the load device is interrupted when a leakage occurs). It is a switch to be set to (blocking state).

  In addition, on the front wall portion of the plug body 20, a single insertion port 31 (corresponding to a three-pole plug) for inserting a plug of a load device or the like is provided below the test button 24. Although not shown, one similar insertion port is also provided at the center of the lower wall portion which is a part of the side wall portion of the plug body 20. In the lower part of the plug main body 20, a common blade receiving bracket 32 to which a power plug and a grounding plug of a load device or the like inserted from both the insertion ports 31 is fitted is provided.

  On the front wall of the plug body 20, the power supply display unit 21 is provided at a position near the left end above the ON button 23, and the pole number display unit 22 is provided at a position near the right end so as to be at the same height. ing.

  The power display unit 21 is composed of, for example, an LED. When it is detected that the ON button 23 has been pushed and inserted into the outlet, it is possible to energize between the outlet and the load device via the plug 10. Lights when the camera is in a bad state. Thereby, the user who uses the plug 10 can grasp that the commercial power and the load device are normally conducted. On the other hand, the power source display unit 21 is turned off when the plug 10 is in a non-energized state, for example, when an interruption operation is performed by the leakage protection unit 50 that detects overcurrent or leakage. As a result, the user can grasp that an overcurrent or a leakage has occurred, or that the test has been performed normally.

  After the overcurrent or leakage occurs, and after the confirmation of the operation of the plug 10 by the test button 24 is completed, the plug 10 can be used again as a leakage detection breaker by pressing the ON button 23 again. Become.

  The pole number display part 22 represents the state of the number of poles of the plug 25, and a pole number display window 22a formed through the front wall of the plug body 20 and a plug on the rear side of the pole number display window 22a. It consists of a color display section 46a, which will be described later, arranged in the main body 20. In other words, the pole number display unit 22 is configured so that the display color of the color display unit 46a can be seen through the pole number display window 22a.

  In the left wall portion of the plug body 20, a circular recess 28 a having a peripheral wall portion having an arcuate cross section is formed at a position near the upper end. A rectangular button insertion hole 28b is formed so as to penetrate the left side wall portion from the bottom to the front end of the recess 28a. A push-type release button 41 as an operation means is movably inserted into the button insertion hole 28b. The release button 41 has a rod portion 41c extending in the right direction, and prevents the plug body 20 from coming off at a position (hereinafter also referred to as a button reference position) where a tip end (left end portion) projects out of the plug body 20. Has been. The release button 41 is always urged in the protruding direction by a release button spring 42 (see FIG. 2) around the rod portion 41c. That is, the release button 41 is configured to be pushed into the main body 20 of the plug when an operating force is applied, and to return to the protruding position when the operating force is released.

  Next, the power receiving blade will be described in detail.

(Power supply blade holder)

  The power receiving blades 82, 86, 83, 87 are for holding the power plug blades of the load devices when the power plugs of the load devices are inserted into the outlet portions 31, 33. It is made of a relatively good metal (such as copper). In FIG. 6, the power receiving blade 81 is disposed on the right side 28 </ b> R side of the main body 20, and the power receiving blade 85 is disposed on the left side 28 </ b> L side of the main body 20. When the power receiving blade 81 and the power receiving blade 85 are disposed inside the main body 20, the power receiving blade 81 and the power receiving blade 85 are symmetrical with respect to the broken line L <b> 1 extending in the X direction according to FIG. 3.

  Specifically, the power receiving blade 81 includes a first power receiving blade portion 82 and a second power receiving blade portion 83, and the power receiving blade 85 includes a first power receiving blade portion 86 and a second power receiving blade. Part 87.

  As shown in FIG. 5, the first power receiving blade portion 82 extends in the Z direction along the power plug blade 182 of the power plug 170 inserted into the first outlet portion 31, and the first power receiving blade portion 86 is The power plug 170 extends in the Z direction along the power plug blade 186. As a result, the first power receiving blades 82 and 86 of the power receiving blades 81 and 85 sandwich and fix the two power plug blades 182 and 186 of the power plug 170, respectively.

  The second power receiving blade 83 extends in the X direction along the power plug blade 183 of the power plug 180 inserted into the second outlet 33, and the second power receiving blade 87 is connected to the power plug 180. It extends in the X direction along the plug blade 187. Thereby, the second power receiving blades 83 and 87 of the power receiving blades 81 and 85 sandwich and fix the two power plug blades 183 and 187 of the power plug 180, respectively.

  More specifically, the first power receiving blade portion 82 and the second power receiving blade portion 83 of the power receiving blade 81 are integrally formed of a single plate-like metal, and as shown in FIG. When viewed from the lower surface (bottom surface) 23 side of 20, all Z-direction cross sections are U-shaped at the same height. That is, the first power receiving blades 82 and 86 are convex toward the insertion direction of the power plug blade, but the second power receiving blades 83 and 87 are not inserted in the insertion direction side of the power plug blade. It is convex in a direction perpendicular to the direction. The width in the Z direction of the first power receiving blades 82 and 86 is longer than the width in the Z direction of the second power receiving blades 83 and 87, but the width in the X direction of the first power receiving blades 82 and 86 is The width of the second power receiving blades 83 and 87 is shorter than the width in the X direction. The length of each width is determined according to the extension length of the power plug blades to be clamped and fixed in the first power receiving blade portions 82 and 86 and the second power receiving blade portions 83 and 87 having different insertion directions. Has been. In each of the first power receiving blade portions 82 and 86 and the second power receiving blade portions 83 and 87, the front end portion of the first power receiving blade portions 82 and 86 and the lower surface of the second power receiving blade portions 83 and 87 ( The bottom end of the bottom side 23 is widened toward the outside of the main body 20.

  With the above configuration, when the power supply plug of the load device is inserted into each of the outlet portions 31 and 33, the first power receiving blade portions 82 and 86 cover the front end portions in the insertion direction of the power plug blades, but the second power receiving blade portion 83 and 87 open | release the front-end | tip part of the insertion direction of a power plug blade. That is, when the power plug is inserted, the power plug blades of the power plug are fixed in a state where they are close to the limit. As a result, the main body 20 can be reduced in size as compared with the case where both the first power receiving blade portions 82 and 86 and the second power receiving blade portions 83 and 87 cover the distal end portions in the insertion direction of both power plug blades. ing.

  As shown in FIG. 3, each power receiving blade 83, 87, 82, 86 has a recess 81 a, 85 a on the back surface 24 side in a portion extending in the X direction from the first power receiving blade portions 82, 86. Is formed. The recesses 81a and 85a are engaged with grooves formed in the partition plate 20ba, whereby the power receiving blades 81 and 85 are fixed to the rear cover 20b.

  Next, the ground receiving blade will be described in detail.

(Earth blade)

  The ground receiving blade 90 is for holding the ground pin of the load device when the power plug of the load device is inserted into each of the outlet portions 31 and 33, and is a metal having relatively good conductivity (copper or the like). ). The ground receiving blade 90 includes a ground terminal plate 91, a first ground receiving blade portion 94, and a second ground receiving blade portion 96 shown in FIG. 4, and these are combined as shown in FIG. Yes.

  The ground terminal plate 91 includes a ground terminal plate 91 extending in the XY direction, and a protruding portion configured to protrude from a part of the ground terminal plate 91 by being bent stepwise in the Z direction.

  A ground terminal screw 98 a is screwed to one end of the ground terminal plate 91. At the other end of the ground terminal plate 91, a screw 98 c is provided for screwing the conductor 71 and the ground terminal plate 91 that are vertically and horizontally inside the main body 10 and extend in the direction of the ground pin. And the ground pin 25b are electrically connected by being electrically connected by a lead wire.

  A part of the ground terminal plate 91 is exposed on the rear surface 24 of the main body 20, and a screw 98 a for ground terminal is screwed thereto. An electric wire can be attached to the ground terminal screw 98a from the outside of the main body 20. In addition, when attaching an electric wire, in order to ensure electrical safety, it attaches using the crimp terminal 26. FIG.

  Since the present invention includes a ground wire connection terminal portion that can be connected from the outside of the plug main body to the ground electrode outside the main body, it is a plug-plug type electric leakage having an internal leakage detection function and a blocking function. In addition to circuit breakers, it is useful as a widely applied plug.

DESCRIPTION OF SYMBOLS 10 Plug 20 Main body 25b Earth pin 91 Earth terminal board 94 Blade receptacle 95 used as a grounding electrode Blade receptacle 98a used as a grounding electrode Grounding terminal 71 Conductor

Claims (3)

The plug blade is projected from a predetermined surface,
A plug having a main body in which an outlet is disposed on a surface other than the predetermined surface,
In the main body, while the conductors constituting the plug blade and the ground poles in the conductor constituting the outlet are electrically connected by the conductor,
A plug structure characterized in that a part of a conductor that connects the grounding electrodes is provided with a grounding terminal arrangement portion that can connect an electric wire from the outside of the main body to the conductor. In claim 1,
The ground terminal arrangement portion is arranged with a part exposed in the protruding direction of the plug blade on the predetermined surface,
A plug structure in which an operation portion of the ground terminal arrangement portion is arranged along the projecting direction. In claim 2,
The plug structure is characterized in that the periphery of the ground terminal arrangement portion is formed to be recessed from a predetermined surface on which the plug blade protrudes and is opened only in one side surface direction.

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