JP4826465B2 - Outlet - Google Patents

Description

  The present invention relates to an outlet having a function of detecting occurrence of a tracking phenomenon.

  In this type of outlet, a grounding electrode is placed between a pair of plug blade insertion openings, and when a carbonized portion is generated between the plug blades of the plug due to tracking phenomenon, a grounding electrode is placed on the carbonized portion. There has conventionally been proposed a method in which an electrical leakage phenomenon is generated by contact and an electrical leakage breaker is activated to detect the tracking phenomenon (see, for example, Patent Document 1).

In addition, as another outlet, a tracking detection electrode is provided between a pair of plug blade insertion ports, and a current flowing between the plug blade inserted into the blade insertion port and the tracking detection electrode is detected by a tracking phenomenon. In the past, there has been proposed a device that detects the tracking phenomenon and cuts off the energization (see, for example, Patent Document 2).
JP-A-9-213425 (paragraph [0006] and FIGS. 1 and 12) Japanese Patent No. 3513847 (paragraphs [0015]-[0018] and FIG. 1)

  In the outlets shown in Patent Documents 1 and 2 above, when the plug is not connected, the ground electrode and the tracking detection electrode are exposed on the front surface of the instrument body, so there is a possibility that a human body or an object will come into contact with the outlet. . If the grounding electrode and tracking detection electrode are grounded, there is no risk of electric shock, but the grounding electrode and detection electrode are placed in a place where they can be visually recognized, which may cause anxiety to the user. In addition, the grounding electrode and the tracking detection electrode may be damaged or dirt may be attached.

  The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an outlet in which the tracking detection electrode is arranged at a position where it cannot be seen from the outside without a plug connected. is there.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a plug body into which two plug blades are inserted and a pair of plug blade insertion openings are opened in the front, and is housed in the interior of the device body. A plurality of blade receiving members that are electrically connected to the blades inserted through the blade insertion holes and connected to a power source, and a closed position that closes and opens the blade blade insertion holes. A door member that is movably disposed between the door biasing spring and biased in the closing direction by the door biasing spring, and that moves in the opening direction against the spring force of the door biasing spring when pressed by the plug blade, Detection electrode insertion hole that opens between the two blade insertion holes forming a pair on the front surface of the main body, and is driven according to the opening / closing operation of the door member. Detects when protruding and projecting position where it contacts the plug Tracking that detects tracking from the detection electrode that is arranged to move forward and backward between the retraction position that retracts to the inside of the electrode insertion hole, and the current that flows between the plug blade inserted into the plug blade insertion port and the detection electrode It is characterized by comprising detecting means and blocking means for electrically blocking between the blade receiving member and the power source when the tracking detecting means detects tracking.

  According to a second aspect of the present invention, in the first aspect of the invention, the one end side is fixed to the bottom side of the instrument body, and the other end side is provided with a coil spring connected to the detection electrode, and the door member is moved to the closed position. In the state, the detection electrode is pressed against the door member and bent so that the coil spring is bent, so that the detection electrode is retracted inward, and in the state where the door member is moved to the open position, the coil spring is linearly changed from the bent state. The detection electrode protrudes outward by returning.

  According to a third aspect of the present invention, in the second aspect of the present invention, a columnar press-fitting protrusion is provided on the bottom of the instrument body, and one end side of the coil spring is press-fitted and fixed, and a protrusion serving as a press-fitting allowance is provided on the peripheral surface of the press-fitting protrusion An inclined surface for guiding insertion of the coil spring is provided on the front side of the projecting portion in the press-fitting direction.

  According to a fourth aspect of the present invention, in the first aspect of the invention, a coil spring having one end fixed to the door member and a detection electrode connected to the other end is detected, and the detection is performed when the door member is moved to the closed position. When the detection electrode comes into contact with the edge of the electrode insertion hole and bends so that the coil spring is bent, the detection electrode is retracted inward, and when the door member is moved to the open position, the coil spring is moved from the bent state. The detection electrode protrudes outward by returning to a straight line.

  The invention of claim 5 is characterized in that, in the invention of claim 4, the door member is provided with a columnar press-fitting projection into which one end side of the coil spring is press-fitted and fixed.

  According to a sixth aspect of the invention, in the fourth or fifth aspect of the invention, in the state where the door member is moved to the closed position, the door is provided with an escape groove for releasing the detection electrode which is brought into contact with the edge of the detection electrode insertion hole and brought down. It is provided in the member.

  A seventh aspect of the present invention provides the method according to any one of the fourth to sixth aspects, wherein an inclined surface for tilting the detection electrode is brought into contact with the detection electrode approaching as the door member moves in the closing direction. It is provided at the hole edge of the detection electrode insertion hole.

  The invention of claim 8 is the invention according to any one of claims 1 to 7, wherein the instrument main body is composed of a front side cover and a rear side body, and one end side of the door biasing spring is provided on the inner side surface of the cover. And a door fixing portion that contacts the door member and restricts movement of the door member in the closing direction.

  The invention of claim 9 is the invention according to any one of claims 1 to 8, wherein the detection electrode falls down at the hole edge of the detection electrode insertion hole on the inner surface of the instrument body in a direction crossing the direction in which the detection electrode advances and retreats. A guide wall is provided to prevent this.

  The invention of claim 10 is the invention according to any one of claims 1 to 9, wherein the door member in the closed position is pressed by the plug blade inserted from one of the plug blade insertion openings, In the state where the part of the door member that faces is inclined so as to approach the back side of the front wall of the instrument body, the door member that is close to the back side of the front wall of the instrument body is locked with the part of the door member to restrict the door member from moving in the opening direction The movement restricting protrusion is provided on the back side of the front wall of the instrument body.

  According to the invention of claim 1, in the state where the door member is moved to the closed position when the plug is not connected, the detection electrode is moved by the door member to a position retracted inside the detection electrode insertion hole. The human body does not come into contact with the detection electrode, so that a sense of security can be given to the user, and the detection electrode can be prevented from becoming dirty or damaged. Furthermore, if the door member moves to the open position when the plug is connected, the detection electrode moves to a position protruding outward from the detection electrode insertion hole, so that the tracking detection means tracks the detection electrode by bringing the detection electrode into contact with the plug. There is an effect that the phenomenon can be reliably detected, and the power supply to the blade receiving member can be reliably interrupted by the interrupting means.

  According to the invention of claim 2, the one end side is fixed to the bottom side of the instrument body, and the coil spring having the detection electrode fixed to the other end side is curved in accordance with the movement of the door member in the closing direction. The detection electrode is retracted to the inside of the detection electrode insertion hole, and the detection electrode is moved outward from the detection electrode insertion hole by returning the coil spring from the curved state to the linear shape according to the movement of the door member in the opening direction. Since it protrudes, there is an effect that the size of the instrument body in the front-rear direction can be made smaller than when the detection electrode is advanced and retracted in the front-rear direction.

  According to the invention of claim 3, the protrusion provided on the peripheral surface of the press-fitting protrusion is provided with an inclined surface on the near side in the press-fitting direction, and the coil spring is guided by the inclined surface when the coil spring is press-fitted. Therefore, the press-fitting work can be easily performed, and when the press-fitting is completed, the protruding portion serves as a press-fitting allowance, so that the coil spring can be firmly fixed to the press-fitting projection.

  According to the invention of claim 4, since one end side of the coil spring is fixed to the door member and the detection electrode is fixed to the other end side, the coil spring is fixed to the door member according to the opening / closing movement of the door member. The relative positional relationship between the one end side of the coil spring and the detection electrode insertion hole can be changed. Therefore, the coil spring is bent in accordance with the movement of the door member in the closing direction to retract the detection electrode to the inside of the detection electrode insertion hole, and the coil spring is bent in accordance with the movement of the door member in the opening direction. The effect of being able to make the detection electrode protrude outward from the detection electrode insertion hole by returning it to a straight line from the state, and the size of the instrument body in the front-rear direction can be made smaller than when the detection electrode is advanced and retracted in the front-rear direction. There is.

  According to the fifth aspect of the present invention, since one end of the coil spring is fixed to the door member by press-fitting into the press-fitting protrusion, the operation of fixing the coil spring to the door member can be easily performed.

  According to the sixth aspect of the present invention, there is an effect that it is possible to prevent the detection electrode from interfering with the door member because the detection electrode that is tilted according to the curvature of the coil spring enters the escape groove.

  According to the invention of claim 7, there is an effect that the detection electrode can be brought down smoothly by bringing the detection electrode into contact with the inclined surface provided at the hole edge of the insertion hole for the detection electrode.

  According to invention of Claim 8, if a door member is arrange | positioned via a door urging | biasing spring between a spring receiving part and a door fixing | fixed part, a door member will be pressed against a door fixing | fixed part with the urging | biasing force of a door urging | biasing spring. Thus, the door member and the door urging spring can be temporarily fixed to the cover, and the assembly workability of the instrument body can be improved.

  According to the ninth aspect of the present invention, even when the detection electrode is retracted to the inside of the detection electrode insertion hole, the detection electrode is prevented from coming off from the detection electrode insertion hole by contacting the guide wall. Therefore, there is an effect that the advance / retreat operation of the detection electrode is stabilized.

  According to the invention of claim 10, when the plug blade is not inserted into both of the two plug blade insertion ports forming the set and is inserted only on one side, the door member is tilted and locked with the movement restricting projection. Thus, since the door member can be prevented from moving in the opening direction, there is an effect that the door member can be prevented from being opened due to mischief or the like.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
Embodiment 1 of this invention is demonstrated based on FIGS. In the following description, unless otherwise specified, the arrows a and b in FIG. 3 are defined as the vertical direction, the arrows c and d are defined as the left and right directions, and the arrows e and f are defined as the forward and backward directions.

  As shown in FIGS. 1 (a) and 3, the appliance main body 1 of the outlet A includes a substantially box-shaped rear surface body 2 having an open front surface, and a substantially box-shaped front surface cover 3 having a rear surface opened. Are coupled by using a conventionally known coupling means. The appliance body 1 is formed in a shape and size that can be attached to a standardized attachment frame (not shown) for attaching the embedded wiring appliance to the construction surface, and is attached to the attachment frame. In the present embodiment, for example, an embedded wiring device having a unit size (a size capable of attaching up to three to a single mounting frame) is provided. It is formed in a size (three module dimensions) in which three are arranged in the short width direction (vertical direction).

  On the front surface of the cover 3, as shown in FIG. 3, a pair of plug blade insertion ports 4a, 4a into which parallel plug blades (not shown) of the voltage poles of the plugs are respectively inserted are substantially at the center in the vertical direction. Opened side by side, an insertion port 4b into which a round pin (not shown) of a ground electrode is inserted is opened below the plug blade insertion ports 4a and 4a. A slit-like insertion hole 5 for a detection electrode extending in the vertical direction is opened on the front surface of the cover 3 at an intermediate position between the plug blade insertion ports 4a and 4a.

  The inside of the body 2 is partitioned into a plurality of storage chambers by a partition wall 6 as shown in FIG. 6, and a voltage electrode is provided at a position corresponding to the plug blade insertion ports 4a and 4a as shown in FIGS. There are two storage chambers 8a and 8a for storing blade receiving members 7a and 7a that are electrically connected to the plug blade, respectively, and are electrically connected to the plug blade of the ground electrode at a position corresponding to the plug blade insertion port 4b. A storage chamber 8b for storing the blade receiving member 7b connected to the is provided.

  Incidentally, FIG. 11 shows an internal circuit diagram of the outlet A. The outlet A includes connection terminals Ta and Tb to which power lines are respectively connected and a connection terminal Tc to which a ground line is connected, and a blade receiving member 7a. , 7a are connected to an external power supply AC via power lines connected to the connection terminals Ta, Tb, and the blade receiving member 7b is grounded via a ground line connected to the connection terminal Tc. The outlet A includes a leak detection unit 12 (tracking detection means) that detects tracking by detecting a current flowing between a plug blade inserted into the plug blade insertion port 4a and a detection electrode 11 described later, and a connection terminal. Contacts 13 and 13 (breaking means) provided on the electric paths between Ta and Tb and the blade receiving members 7a and 7a, respectively, and forcibly opened by the leakage detection unit 12 when the leakage detection unit 12 detects tracking. And a power supply circuit 14 which is supplied with power from the blade receiving members 7a and 7a and generates an operating power supply for the internal circuit.

  Here, an electric wire insertion opening (not shown) for inserting a power supply line and a grounding line is opened on the back surface of the body 2, and a power supply line and a grounding line inserted into the body 2 through the electric wire insertion opening. The connection terminals (not shown) of the quick connection terminal structure that are electrically connected to each other are housed, and the connection terminals Ta, Tb, and Tc described above are constituted by these connection terminals.

  In addition, a door member 9 is housed inside the instrument body 1 so as to be movable between a closed position for closing the two plug blade insertion ports 4a, 4a and an open position for opening the plug blade insertion openings 4a, 4a. As shown in FIG. 8A, the door member 9 is provided with wing pieces 9a and 9a projecting to the left and right and a connecting portion 9b for connecting the upper portions of the wing pieces 9a and 9a. 6 is slidably mounted. Protrusions 9c and 9c are provided on the lower side surfaces of the left and right wing pieces 9a and 9a (the left side surface in FIG. 8A), respectively, into which one end side of the door biasing spring 10 made of a coil spring is press-fitted and fixed. Yes. Here, as shown in FIG. 9A, a spring cradle 3 a that receives the front side portion on the other end side of the door urging spring 10 protrudes from the back surface of the front wall of the cover 3, and the door member 9 Door fixing pieces (door fixing portions) 3b and 3b that protrude from the upper end portion and restrict the movement of the door member 9 in the closing direction are projected.

  Thus, as shown in FIG. 9C, the other end side of the door biasing springs 10 and 10 is brought into contact with the spring cradles 3a and 3a in the cover 3, and the upper portion of the door member 9 is connected to the door. When the door member 9 and the door biasing springs 10 and 10 are arranged so as to contact the fixing pieces 3b and 3b, the door member 9 is pressed against the door fixing pieces 3b and 3b by the spring force of the door biasing springs 10 and 10. Therefore, the door member 9 and the door biasing springs 10 and 10 can be temporarily held by the cover 3. As shown in FIGS. 1, 2, and 4, spring receiving bases 6 a and 6 a that receive the rear side portion of the other end side of the door biasing springs 10 and 10 are formed on the upper surface of the partition wall 6 of the body 2. In the assembled state, the other end of the door biasing spring 10 is held between the spring cradles 3a and 6a, and the door biasing springs 10 and 10 elastically bias the door member 9 in the closing direction. . Each blade piece 9a is formed with an inclined surface 9d at a position facing the plug blade insertion port 4a in the closed position, and the plug 100 inserted into the plug blade insertion port 4a as shown in FIGS. When the plug blade 101 presses the inclined surface 9d, a force for sliding the door member 9 in a direction orthogonal to the insertion direction of the plug blade 101 is generated, and the door member 9 resists the spring force of the door biasing spring 10. Slides in the opening direction. Since this door member 9 simultaneously opens and closes a pair of plug blade insertion ports 4a, 4a, the advantage is that the number of parts can be reduced as compared with the case where one door member is provided for each plug blade insertion port 4a. There is.

  In addition, since the outlet A of the present embodiment has a grounding electrode, it is necessary to secure a space for storing the blade receiving member 7b for the grounding electrode in the central portion of the instrument body 1 in the left-right direction. By arranging the urging springs 10, 10, the spring force of the door urging springs 10, 10 is applied to the door member 9 in a well-balanced manner. Therefore, as shown in FIG. 8 (b), a protrusion 9c is provided at the center in the left-right direction of the door member 9, and one end of the door urging spring 10 is held by the protrusion 9c, thereby providing one door urging spring. The door member 9 may be urged by only 10.

  Further, inside the instrument main body 1 is housed a detection electrode 11 which is disposed so as to be movable back and forth between a position protruding outward from the detection electrode insertion hole 5 and a position retracting inward. The detection electrode 11 is formed in an elongated rectangular plate shape using a conductive material, and one end side of the coil spring 15 is press-fitted and fixed to one end side in the longitudinal direction. A columnar press-fit protrusion 16 is provided on the bottom wall of the body 2 at a position behind the detection electrode insertion hole 5, and the other end of the coil spring 15 is press-fitted and fixed to the press-fit protrusion 16. Is attached to the body 2 via the coil spring 15. Here, as shown in FIG. 5 (a), one end side of the detection electrode 11 is formed in a wedge shape by forming tapers 11a, 11a on both side edges in the width direction, and the tip is tapered. 15 press-fitting operations can be easily performed. Further, notches 11b and 11b are formed on both side edges in the width direction of the detection electrode 11 at the front side (upper side in FIG. 5) of the taper 11a. Therefore, as shown in FIG. When the wire 11 of the coil spring 15 is fitted into the notch 11b when 11 is pressed into the coil spring 15, the detection electrode 11 can be prevented from coming off. Further, as shown in FIG. 6B, a protruding portion 16a extending along the axial direction is provided on the peripheral surface of the press-fitting protrusion 16, and an upper end portion of the protruding portion 16a (before the insertion direction of the coil spring 15). An inclined surface 16b for guidance is formed on the side. Thus, when the other end side of the coil spring 15 is press-fitted into the press-fit protrusion 16, the protrusion 16a serves as a press-fitting allowance so that the coupling between the coil spring 15 and the press-fit protrusion 16 can be strengthened, and the protrusion 16a. Since the inclined surface 16b is provided at the upper end of the coil spring 15, the coil spring 15 can be easily press-fitted. The detection electrode 11 is electrically connected to a tracking detection means (leakage detection unit 12 or the like) via a lead wire or a conductive plate (not shown).

  Here, the detection electrode 11 advances and retreats from the detection electrode insertion hole 5 according to the opening / closing operation of the door member 9, and the door member 9 is moved to the closed position as shown in FIG. Then, the blade insertion holes 4a and 4a are closed by the inclined surfaces 9d and 9d, and the connecting portion 9b is located above the detection electrode insertion hole 5 opened between the blade insertion holes 4a and 4a (FIG. 2 ( b) to the right side), the detection electrode 11 is pressed upward by the connecting portion 9b. The spring constant of the coil spring 15 that supports the detection electrode 11 is set to be smaller than the spring load of the two door biasing springs 10 and 10, and the door member 9 has moved to the closed position. In the state, the coil spring 15 is bent by the force by which the connecting portion 9b presses the detection electrode 11, and the detection electrode 11 falls down, so that the detection electrode 11 is inserted into the detection electrode insertion hole 5 as shown in FIG. Retreat inside. Thus, when the plug 100 is not connected, the detection electrode 11 is retracted to the inside of the detection electrode insertion hole 5, so that a human body or the like does not come into contact with the detection electrode 11, and the user feels at ease. In addition, the detection electrode 11 can be prevented from becoming dirty or damaged. Further, on the back side of the front wall of the cover 3, rectangular plate-shaped guide walls 17, 17 projecting in the direction substantially perpendicular to the front surface of the cover 3 are provided on the left and right side edges of the detection electrode insertion hole 5. In a state where the detection electrode 11 is retracted inside the detection electrode insertion hole 5, the detection electrode 11 is disposed between the guide walls 17, 17, so that the detection electrode 11 falls in a direction crossing the advancing / retreating direction. Therefore, it is possible to prevent the detection electrode 11 from being removed from the detection electrode insertion hole 5 and to stabilize the advance / retreat operation of the detection electrode 11.

  On the other hand, when the plug blade 101 of the plug 100 is inserted into the plug blade insertion port 4a and the plug blade 101 presses the inclined surface 9d of the door member 9, the door member 9 is slid from the closed position to the open position. As shown in FIG. 1A, the connecting portion 9b moves below the detection electrode insertion hole 5 to completely open the plug blade insertion port 4a, and the connecting portion 9b presses the detection electrode 11. The force disappears, and the detection electrode 11 stands up linearly by the spring return force of the coil spring 15. At this time, the detection electrode 11 protrudes outside the detection electrode insertion hole 5 and is elastically contacted with a portion between the pair of plug blades 101 on the distal end surface of the plug 100 by the spring force of the coil spring 15. Thus, when a tracking phenomenon occurs due to dust or the like adhering to the tip surface of the plug 100 in a state where the plug 100 is connected, and a current flows between the plug blade 101 and the detection electrode 11, the leakage detection unit 12 By detecting the current that flows sometimes and opening the contact point 13, the power supply to the blade receiving members 7 a and 7 a can be stopped, and the safety can be improved by reliably detecting the tracking phenomenon. .

  Thereafter, when the plug 100 is pulled out from the outlet A, the force that the plug blade 101 presses the inclined surface 9d of the door member 9 disappears, and the door member 9 receives the spring force of the door biasing spring 10 to move from the open position to the closed position. Since it slides, the plug blade insertion opening 4a is closed by the door member 9. At this time, the detection electrode 11 is pressed by the door member 9 and the coil spring 15 is bent, so that the detection electrode 11 is retracted to the inside of the detection electrode insertion hole 5. Thus, in the present embodiment, the state in which the detection electrode 11 is retracted into the detection electrode insertion hole 5 by bending or standing the coil spring 15 according to the opening / closing operation of the door member 9, and the detection electrode insertion The state of projecting to the outside of the hole 5 can be switched, and the size of the instrument body 1 in the front-rear direction can be made smaller than when the detection electrode 11 is advanced and retracted in the front-rear direction.

  By the way, as shown in FIGS. 9 and 10, the door member 9 in the closed position is pressed by the plug blade 101 inserted from one plug blade insertion port 4a on the back side of the front wall of the cover 3, and the other plug blade. In a state where the portion of the door member 9 facing the insertion port 4 a is inclined so as to approach the back side of the front wall of the cover 3, the door member 9 engages with the portion of the door member 9 that approaches the back side of the front wall of the cover 3. A movement restricting projection 3c that restricts movement in the opening direction is provided so as to protrude toward the opening direction with respect to the door member 9 in the closed position. Therefore, as shown in FIG. 10B, when the door member 9 is pressed by an object inserted only into one (left side in the drawing) plug blade insertion port 4a due to mischief or the like, the door member 9 is inclined. Thus, the wing piece 9a on the side opposite to the pressed side (right side in the figure) is locked to the movement restricting projection 3c, so that the movement of the door member 9 in the opening direction can be restricted. Can be prevented from being opened, and safety can be improved.

  In addition, although this embodiment demonstrated to the example the electrical outlet which has an electrical leakage interruption function, you may apply to the general electrical outlet which does not have an electrical leakage interruption function.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. In the first embodiment described above, the detection electrode 11 is attached to the body 2 via the coil spring 15, whereas in the present embodiment, the detection electrode 11 is attached to the door member 9 via the coil spring 15. In addition, since structures other than the detection electrode 11 and the door member 9 are the same as that of Embodiment 1, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  As shown in FIGS. 14 and 16, the door member 9 includes leg pieces 9 e having an L shape in side view and wing pieces 9 a and 9 a projecting from the front side edge of the leg pieces 9 e to the left and right sides. It is accommodated in a storage recess 18 provided in the center so as to be slidable in the vertical direction. The left and right blade pieces 9a and 9a are provided with protrusions 9c and 9c, respectively, on which one end side of the door biasing spring 10 made of a coil spring is press-fitted and fixed. Each blade piece 9a is formed with an inclined surface 9d at a portion facing the plug blade insertion opening 4a in the closed position, and an escape groove 19 for letting the detection electrode 11 escape between the left and right blade pieces 9a, 9a. Is formed.

  In addition, a columnar press-fitting projection 20 is provided on the horizontal bar portion of the leg piece 9e so that one end side of the coil spring 15 is press-fitted and fixed. A projecting portion 20a extending along the axial direction is formed on the peripheral surface of the press-fitting projection 20. Projected. Thus, when the other end side of the coil spring 15 is press-fitted into the press-fitting protrusion 20, the protrusion 20 a serves as a press-fitting allowance, and the coil spring 15 and the press-fitting protrusion 20 can be firmly coupled.

  As described above, in the present embodiment, one end side of the coil spring 15 is attached to the press-fit protrusion 20 provided on the leg piece 9e of the door member 9, and the detection electrode 11 is press-fitted and fixed to the other end side of the coil spring 15. Yes, the detection electrode 11 is attached to the door member 9 via a coil spring 15. As shown in FIG. 16C, the detection electrode 11 is electrically connected to a tracking detection means (leakage detection unit 12 or the like) via a lead wire 102 or a conductive plate.

  On the other hand, the body 2 is formed with spring cradles 24, 24 for receiving the other end sides of the door biasing springs 10, 10 attached to the door member 9, and the door biasing springs 10, 10 are attached. When the door member 9 is inserted into the storage recess 18, the door member 9 and the door biasing springs 10, 10 are pressed by the spring force of the door biasing springs 10, 10 against the end surface of the storage recess 18. Can be temporarily held by the body 2.

  Here, the detection electrode 11 advances and retreats from the detection electrode insertion hole 5 in accordance with the opening / closing operation of the door member 9, and the door member 9 is moved to the closed position as shown in FIGS. In the moved state, the plug blade insertion port 4a is closed by the inclined surface 9d of the blade piece 9a, and the relative position between the one end side of the coil spring 15 fixed to the leg piece 9e and the detection electrode insertion hole 5 is determined. The relationship changes, and the detection electrode 11 is pressed against the edge of the detection electrode insertion hole 5. The spring constant of the coil spring 15 that supports the detection electrode 11 is set to be smaller than the spring load of the two door biasing springs 10 and 10, and the door member 9 has moved to the closed position. In the state, the coil spring 15 is bent by the force with which the hole edge of the detection electrode insertion hole 5 presses the detection electrode 11, and the detection electrode 11 falls down, so that the detection electrode 11 is placed inside the detection electrode insertion hole 5. Evacuated. Thus, when the plug 100 is not connected, the detection electrode 11 is retracted to the inside of the detection electrode insertion hole 5, so that a human body or the like does not come into contact with the detection electrode 11, and the user feels at ease. In addition, the detection electrode 11 can be prevented from becoming dirty or damaged.

  The door member 9 has a relief groove 19 formed between the blades 9a, 9a, and the detection electrode 11 that is pushed down by the hole edge of the detection electrode insertion hole 5 enters the escape groove 19. Thereby, interference with the door member 9 can be prevented, and the advance / retreat operation of the detection electrode 11 can be performed smoothly. Further, as shown in FIG. 13B and FIG. 17, the closer to the detection electrode insertion hole 5, the smaller the amount of protrusion from the back side of the front wall of the cover 3 becomes at the hole edge of the detection electrode insertion hole 5. Therefore, the detection electrode 11 approaching as the door member 9 moves in the closing direction comes into contact with the inclined surface 22, and the detection electrode 11 is easily tilted. Eleven forward / backward movements can be performed smoothly. Further, on the back side of the front wall of the cover 3, rectangular plate-like guide walls 23, 23 projecting in a direction substantially perpendicular to the front surface of the cover 3 are provided on the left and right side edges of the detection electrode insertion hole 5. When the detection electrode 11 is retracted inside the detection electrode insertion hole 5, the detection electrode 11 is disposed between the guide walls 23, 23, so that the detection electrode 11 falls in a direction crossing the advancing / retreating direction. Therefore, it is possible to prevent the detection electrode 11 from being removed from the detection electrode insertion hole 5 and to stabilize the advance / retreat operation of the detection electrode 11.

  On the other hand, when the plug blade 101 of the plug 100 is inserted into the plug blade insertion port 4a and the plug blade 101 presses the inclined surface 9d of the door member 9, the door member 9 is slid from the closed position to the open position. 12 (a) and 12 (b), the press-fitting protrusion 20 provided on the leg piece 9e moves to a position facing the detection electrode insertion hole 5 (lower position in FIG. 12 (b)). The electrode 11 is separated from the hole edge of the detection electrode insertion hole 5, and the detection electrode 11 is raised by the spring return force of the coil spring 15. At this time, the detection electrode 11 protrudes to the outside of the detection electrode insertion hole 5 and is elastically contacted with the portion between the plug blades 101, 101 of the plug 100 by the spring force of the coil spring 15. Thus, when a tracking phenomenon occurs due to dust or the like adhering to the tip surface of the plug 100 in a state where the plug 100 is connected, and a current flows between the plug blade 101 and the detection electrode 11, the leakage detection unit 12 By detecting the current that flows sometimes and opening the contact point 13, the power supply to the blade receiving members 7 a and 7 a can be stopped, and the safety can be improved by reliably detecting the tracking phenomenon. .

  Thereafter, when the plug 100 is pulled out from the outlet A, the force that the plug blade 101 presses the inclined surface 9d of the door member 9 disappears, and the door member 9 receives the spring force of the door biasing spring 10 to move from the open position to the closed position. Since it slides, the plug blade insertion opening 4a is closed by the door member 9. At this time, as the door member 9 slides, the detection electrode 11 is pressed against the hole edge of the detection electrode insertion hole 5 and the coil spring 15 is bent, so that the detection electrode 11 is inside the detection electrode insertion hole 5. Evacuated to the state. Thus, in the present embodiment, the state in which the detection electrode 11 is retracted into the detection electrode insertion hole 5 by bending or standing the coil spring 15 according to the opening / closing operation of the door member 9, and the detection electrode insertion The state of projecting to the outside of the hole 5 can be switched, and the size of the instrument body 1 in the front-rear direction can be made smaller than when the detection electrode 11 is advanced and retracted in the front-rear direction.

  By the way, in this embodiment, the protrusion 18a is formed in the bottom face of the storage recessed part 18 of the body 2 along the sliding direction (up-down direction) of the door member 9, and the bottom face of the leg piece 9e contacts the protrusion 18a. By contacting, the contact area between the door member 9 and the bottom surface of the storage recess 18 is reduced, and the sliding movement of the door member 9 can be performed smoothly. Further, as shown in FIGS. 19 (a) and 19 (b), each blade piece 9a of the door member 9 may be provided with a slide protrusion 25 that is placed on the partition wall of the body 2 and slides on the partition wall. The sliding projections 25 of both wing pieces 9a are in sliding contact with the partition wall of the body 2 so that the door member 9 can be slid without being inclined.

  Further, the bottom surface of the leg piece 9e is formed with inclined surfaces 9f and 9f that are inclined so that the center part in the left-right direction protrudes rearward from both side parts. It is easy to incline around the center of oscillation. Here, as shown in FIG. 19C, when the plug blade 101 is inserted only into the plug blade insertion port 4a on one side (left side in the figure), the blade piece on the side opposite to the side pressed by the plug blade 101 is used. Since the door member 9 is inclined so that 9a approaches the back side of the front wall of the cover 3, the wing piece 9a on the opposite side is engaged with the movement restricting projection 3c provided on the back side of the front wall of the cover 3, thereby 9 can be restricted from moving in the opening direction, and the door member 9 can be prevented from being opened due to mischief or the like, thereby improving safety.

  The wing pieces 9a, 9a of the door member 9 are connected to the leg pieces 9e on one end side of the inclined surfaces 9d, 9d, and are pressed by the plug blade 101 of the plug 100 as shown in FIG. However, since the horizontal bar portion of the leg piece 9e is biased to the opposite side to the protruding side, when a load is applied from the plug blade 101, the door member 9 falls to the left side in the figure as shown in FIG. The inclination angle of the inclined surface 9d with respect to the insertion direction of the plug blade 101 becomes shallow, and the force for sliding the door member 9 is less likely to be generated. Therefore, in this embodiment, the auxiliary leg 21 that protrudes in the same direction as the wing piece 9a from the bent portion of the L-shaped leg piece 9e in the side view is integrally provided, and the auxiliary leg 21 prevents the door member 9 from falling down. Thereby, the sliding movement of the door member 9 can be made smooth.

  It should be noted that a wide variety of different embodiments can be configured without departing from the spirit and scope of the present invention, and the present invention is not limited to a specific embodiment.

The state which connected the plug to the outlet socket of Embodiment 1 is shown, (a) is an external appearance perspective view, (b) is the principal part perspective view of the state which removed the cover. FIG. 2 shows a state in which a plug is not connected to the above, (a) is an external perspective view, and (b) is a main part perspective view with a cover removed. It is an exploded perspective view same as the above. (A)-(c) is principal part sectional drawing which shows the opening / closing operation | movement of the door member used for the same as the above. (A) is explanatory drawing of the detection electrode used for the same as the above, (b) is explanatory drawing of the state which attached the coil spring to the detection electrode. (A) is explanatory drawing of the body used for the same as the above, (b) is the C section enlarged view. It is explanatory drawing of the state which incorporated the detection electrode in the body used for the same. (A) (b) is explanatory drawing of the door member used for the same as the above. (A) is a perspective view of the cover used for the above, (b) is an enlarged view of a D portion, (c) is an explanatory view of a state where a door member and a door urging spring are temporarily held on the cover. (A) (b) is principal part sectional drawing which shows the opening / closing operation | movement of the door member used for the same as the above. It is an internal circuit diagram same as the above. (A) (b) is principal part sectional drawing of the state which connected the plug to the outlet socket of Embodiment 2. FIG. (A) (b) is principal part sectional drawing of the state in which the plug is not connected to the same as the above. It is an exploded perspective view same as the above. (A) is a perspective view of the body used for the above, (b) is a perspective view of a state in which a door member and a detection electrode are incorporated in the body. (A) (b) is explanatory drawing of the door member used for the same as the above, (c) is explanatory drawing of the state which attached the detection electrode to the door member. (A) is the perspective view which looked at the cover used for the same from back, (b) is the E section enlarged view. (A)-(c) is explanatory drawing of the door member used for the same as the above. (A) (b) is explanatory drawing which shows the opening / closing operation | movement of the door member used for the same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument main body 2 Body 3 Cover 4a Plug blade insertion port 5 Detection electrode insertion hole 7a Blade receiving member 9 Door member 10 Door biasing spring 11 Detection electrode 12 Electric leakage detection part (tracking detection means)
13 Contact (breaking means)
15 Coil spring

Claims (10)

  Two plug blades are inserted into the instrument body with a pair of plug blade insertion openings open to the front, and the plug blades that are housed inside the instrument body and inserted through the respective blade insertion holes are electrically connected. And a plurality of blade receiving members connected to the power source, and arranged to be movable between a closed position for closing each plug blade insertion opening and an open position for opening, and closing direction by a door biasing spring The door member that moves in the opening direction against the spring force of the door biasing spring when pressed by the plug blade, and two plug blade insertion ports that form a pair on the front surface of the instrument body A detection electrode insertion hole that opens in between, and a detection electrode that is driven in accordance with the opening / closing operation of the door member, protrudes outward from the detection electrode insertion hole when the plug is connected, and contacts with the plug when not connected Between the retracted position retracted to the inside of the insertion hole Retractable detection electrode, tracking detection means for detecting tracking from a current flowing between the plug blade inserted into the plug blade insertion port and the detection electrode, and a blade receiving member when the tracking detection means detects tracking And an electrical outlet, wherein the electrical outlet is electrically disconnected from the power source.   A coil spring having one end fixed to the bottom side of the instrument body and a detection electrode connected to the other end is provided. When the door member is moved to the closed position, the detection electrode is pressed against the door member and the coil spring is The detection electrode is retracted inward by bending so as to be bent, and when the door member is moved to the open position, the coil spring returns to the linear shape from the curved state, and the detection electrode protrudes outward. The outlet according to claim 1.   A columnar press-fitting projection is provided on the bottom of the instrument body where one end of the coil spring is press-fitted and fixed, and a protrusion serving as a press-fitting allowance is provided on the peripheral surface of the press-fitting protrusion, and the coil spring is inserted in the press-fitting direction near the protrusion. 3. The outlet according to claim 2, further comprising an inclined surface for guiding the battery.   One end side is fixed to the door member, and the other end side is provided with a coil spring to which the detection electrode is connected. When the door member is moved to the closed position, the detection electrode is in contact with the hole of the detection electrode insertion hole. When the coil spring is bent so as to be bent, the detection electrode is retracted inward, and when the door member is moved to the open position, the coil spring returns to the linear shape from the curved state, so that the detection electrode protrudes outward. The outlet according to claim 1.   5. The outlet according to claim 4, wherein the door member is provided with a columnar press-fitting protrusion on which one end side of the coil spring is press-fitted and fixed.   6. The door member according to claim 4, wherein an escape groove is provided in the door member for releasing the detection electrode brought into contact with the edge of the detection electrode insertion hole in a state where the door member is moved to the closed position. Outlet.   5. An inclined surface for tilting the detection electrode in contact with the detection electrode approaching as the door member moves in the closing direction is provided at a hole edge of the detection electrode insertion hole. The outlet according to any one of 6.   The instrument body is composed of a front-side cover and a rear-side body, and a spring receiving portion for receiving one end of the door biasing spring on the inner side surface of the cover, and a door member in contact with the door member in the closing direction. The outlet according to any one of claims 1 to 7, further comprising a door fixing portion that restricts movement.   9. A guide wall for preventing a detection electrode from falling in a direction intersecting with a direction in which the detection electrode advances and retreats at a hole edge of the detection electrode insertion hole on an inner surface of the instrument body. The outlet according to item 1.   The door member in the closed position is pressed by the plug blade inserted from one plug blade insertion port, and the door member part facing the other plug blade insertion port is inclined so that it approaches the back side of the front wall of the instrument body Thus, a movement restricting projection is provided on the rear side of the front wall of the instrument body so as to be engaged with the portion of the door member that is close to the rear side of the front wall of the instrument body and restrict the movement of the door member in the opening direction. Item 10. The outlet according to any one of Items 1 to 9.

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