Extension cord set

Abstract

To provide an extension cord set that can detect tracking.SOLUTION: An extension cord set 1 includes a plug connection portion 7 to which a power plug can be connected, a sensor 9 that detects tracking at the plug connection portion 7, and a cut-off portion 13 that cuts off the supply of power to the plug connection portion 7 when tracking is detected by the sensor 9.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an extension cord set. [Background technology]

[0002] Conventionally, there have been known outlet devices that detect tracking. The outlet device described in Patent Document 1 is an outlet device that is installed on a wall or the like inside a building, and detects tracking using a sensor as an abnormality detection means at the plug connection part of the outlet, determines whether or not there is an abnormality using a control circuit, notifies the occurrence of the abnormality using an alarm means, and cuts off the power supply using a cutoff means. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-5029 A Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an extension cord set capable of detecting tracking. [Means for solving the problem]

[0005] (1) The extension cord set of the present invention comprises a plug connection portion to which a power plug can be connected, a detection portion that detects tracking in the plug connection portion, and a cut-off portion that cuts off the supply of power to the plug connection portion when tracking is detected by the detection portion.

[0006] The extension cord set according to the present invention includes a detection unit that detects tracking at the plug connection unit. This allows the extension cord set to detect tracking. The extension cord set also includes a cut-off unit that cuts off the supply of power to the plug connection unit when tracking is detected by the detection unit. Therefore, the extension cord set can cut off the supply of power to the plug connection unit when tracking occurs.

[0007] (2) In the extension cord set of (1) above, a plurality of plug connection parts may be provided, and the detection part and the cutoff part may be provided individually corresponding to each of the plurality of plug connection parts. In this configuration, tracking detection and power cutoff can be performed for each plug connection part.

[0008] (3) In the extension cord set of (1) or (2) above, a plurality of plug connection parts may be provided, and a second detection part may be provided for detecting tracking between adjacent plug connection parts. In this configuration, the tracking detection range can be set to be wide.

[0009] (4) In the extension cord set of any one of (1) to (3) above, the set may include a plurality of plug connection parts, and a housing that houses the connection part, the detection part, and the cutoff part, and the housing may be provided with a recess between adjacent plug connection parts. In this configuration, the recess can ensure a surface distance (insulation distance) between adjacent plug connection parts, and therefore the occurrence of tracking can be suppressed. Effect of the Invention

[0010] According to the present invention, tracking can be detected in extension cord sets. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing an extension cord set according to one embodiment. [Diagram 2] FIG. 2 is a front view of the extension cord set shown in FIG. [Diagram 3] FIG. 3 is a block diagram illustrating an example of the extension cord set shown in FIG. [Figure 4] FIG. 4 is a front view of an extension cord set according to another embodiment. [Diagram 5] FIG. 5 is a front view of an extension cord set according to another embodiment. [Figure 6] FIG. 6 is a front view of an extension cord set according to another embodiment. [Figure 7] FIG. 7 is a diagram showing a power plug. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicated explanations will be omitted.

[0013] FIG. 1 is a perspective view showing an extension cord set according to one embodiment. FIG. 2 is a front view of the extension cord set shown in FIG. 1. FIG. 3 is a block diagram showing an example of the extension cord set shown in FIG. 1. The extension cord set 1 shown in FIGS. 1 to 3 provides an outlet capable of supplying power to a position separated from the outlet by connecting it to the outlet. The extension cord set 1 supplies power to a load device (electronic device) by inserting a power plug of the load device into the extension cord set 1.

[0014] The extension cord set 1 includes a cord connector body (housing) 3, a power cord 5, a plurality of plug connection units 7, a plurality of sensors (detection units) 9, a control unit 11, and a circuit breaker unit 13.

[0015] The cord connector body 3 houses a plurality of plug connecting portions 7, a plurality of sensors 9, a control portion 11, and a cutoff portion 13. The cord connector body 3 has, for example, a rectangular parallelepiped shape. The cord connector body 3 is made of an electrically insulating material. For example, the cord connector body 3 is made of resin.

[0016] The power cord 5 is connected to an outlet and supplies power to the plug connection portion 7. A power plug (not shown) is connected to the end of the power cord 5. The power cord 5 has a predetermined length. The power cord 5 supplies power to the plug connection portion 7 via power lines 12 and 14.

[0017] A power plug (not shown) can be connected to each of the multiple plug connection portions 7. In this embodiment, five plug connection portions 7 are provided. The multiple plug connection portions 7 are arranged in a row at predetermined intervals in the cord connector body 3 along the longitudinal direction of the cord connector body 3. The plug connection portions 7 are receptacles to which a power plug (not shown) can be connected. The plug connection portions 7 have a pair of receiving blades. The plug connection portions 7 clamp the blades (not shown) of the power plug and connect the power plug to power lines 12, 14 connected to an AC power source.

[0018] Each of the multiple sensors 9 detects tracking in each plug connection portion 7. Each sensor 9 is provided in each plug connection portion 7 to detect tracking occurring between the blades of a power plug connected to each plug connection portion 7. That is, each sensor 9 is provided individually corresponding to each plug connection portion 7. In this embodiment, five sensors 9 are provided.

[0019] The sensor 9 is, for example, a photocoupler, a CT, or a Hall element. The sensor 9 is provided, for example, between a pair of receiving blades in the plug connection portion 7. The sensor 9 detects tracking through a sensor hole 10 provided between the pair of receiving blades of the plug connection portion 7 in the cord connector body 3. The sensor 9 outputs a signal related to the detection result to the control unit 11. The sensor 9 outputs a current generated during tracking as a detection signal.

[0020] The control unit 11 judges whether the detection signal output from each sensor 9 is abnormal, and outputs a signal (hereinafter referred to as output signal) if it is abnormal. The control unit 11 has a judgment unit 15. The judgment unit 15 judges whether tracking is occurring based on the detection signal (current value) output from the sensor 9. The judgment unit 15 judges whether tracking is occurring based on a threshold value set for the detection signal. The threshold value is a current value generated during tracking. The judgment unit 15 judges that tracking is occurring when the detection signal exceeds the threshold value. The control unit 11 outputs an output signal to the cutoff unit 13 when the judgment unit 15 judges that tracking is occurring.

[0021] The cutoff unit 13 has a cutoff switch unit 17 (see Fig. 3) and a cutoff lever 19 (see Figs. 1 and 2). The cutoff switch unit 17 is operated by a signal output from the control unit 11. The cutoff switch unit 17 cuts off the supply of power to the plug connection unit 7 by an output signal output from the control unit 11. The cutoff lever 19 works in conjunction with the cutoff switch unit 17. The cutoff lever 19 is disposed, for example, at one longitudinal end of the cord connector body 3 (the end closer to the power cord 5).

[0022] When an output signal is output from control unit 11, cut-off switch unit 17 opens the electrical circuit, thereby cutting off the supply of power through power line 14. In this way, when extension cord set 1 detects tracking, it can appropriately cut off the supply of power to plug connection unit 7. When the power supply is cut off, cut-off lever 19 included in cut-off unit 13 moves. For example, when an abnormal state of extension cord set 1 (a state in which tracking is occurring) is resolved by an operator, the operator can manually operate cut-off lever 19 to move to the other side.

[0023] As described above, the extension cord set 1 according to this embodiment includes a sensor 9 that detects tracking in the plug connection unit 7. This allows the extension cord set 1 to detect tracking. The extension cord set 1 also includes a cut-off unit 13 that cuts off the supply of power to the plug connection unit 7 when tracking is detected by the sensor 9. This allows the extension cord set 1 to cut off the supply of power to the plug connection unit 7 when tracking occurs.

[0024] Although the embodiment of the present invention has been described above, the present invention is not necessarily limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0025] In the above embodiment, the extension cord set 1 is described as having one control unit 11 and one circuit breaker unit 13. However, each of the control units 11 and circuit breakers 13 may be provided individually corresponding to each plug connection unit 7. That is, if there are five plug connection units 7, there may be five control units 11 and circuit breakers 13. In this configuration, as shown in FIG. 4, in the extension cord set 1A, the circuit breaker lever 19 is disposed near the corresponding plug connection unit 7. In this configuration, tracking detection and power cut-off can be performed for each plug connection unit 7.

[0026] In addition to the above embodiment, as shown in FIG. 5, the extension cord set 1B may include a sensor (second detection unit) 21 that detects tracking between adjacent plug connection units 7. The sensor 21 is, for example, a photocoupler, a CT, or a Hall element. The sensor 21 detects tracking through a sensor hole 22 provided between a pair of plug connection units 7 in the cord connector body 3. The sensor 21 outputs a signal related to the detection result to the control unit 11. Specifically, the sensor 21 outputs a current generated during tracking as a detection signal. With this configuration, the tracking detection range can be set to be wide.

[0027] In addition to the above embodiment, as shown in FIG. 6, in the extension cord set 1C, a recess 23 may be provided between adjacent plug connection portions 7 in the cord connector body 3. The recess 23 has, for example, a rectangular shape when viewed from above. The cross-sectional shape of the recess 23 may be, for example, a rectangular shape, a triangular shape, or a semicircular shape. In this configuration, the recess 23 can ensure a surface distance (insulation distance) between adjacent plug connection portions 7. Therefore, the occurrence of tracking can be suppressed.

[0028] In addition to the above embodiment, as shown in Fig. 7, in the power plug 30, the plug body 32 may be provided with a recess 34. The recess 34 is provided on the end face of the plug body 32 between a pair of plug blades 36. The cross-sectional shape of the recess 34 is, for example, semicircular. The cross-sectional shape of the recess 34 may also be rectangular, triangular, or the like. With this configuration, the occurrence of tracking in the power plug 30 of the extension cord set 1 can be suppressed.

[0029] In the above embodiment, a configuration has been described as an example in which the multiple plug connection portions 7 are arranged in a row at predetermined intervals in the longitudinal direction of the cord connector body 3. However, the arrangement of the multiple plug connection portions 7 in the cord connector body 3 is not limited to this. In addition, the number of plug connection portions 7 is not limited, and may be one or more. [Explanation of symbols]

[0030] 1, 1A, 1B, 1C...extension cord set, 3...cord connector body (housing), 7...plug connection portion, 9...sensor (detection portion), 13...interrupter portion, 21...sensor (second detection portion), 23...recess.

Claims

1. a plug connection portion to which a power plug can be connected; a detection unit for detecting tracking in the plug connection unit; and a cut-off unit that cuts off the supply of power to the plug connection unit when the tracking is detected by the detection unit.

2. A plurality of the plug connection parts are provided, 2. The extension cord set according to claim 1, wherein each of the detection units and the cutoff units is provided corresponding to each of the plurality of plug connection units.

3. A plurality of the plug connection parts are provided, 3. The extension cord set according to claim 1, further comprising a second detection unit for detecting tracking between adjacent plug connection units.

4. A plurality of the plug connection parts are provided, a housing that houses the connection unit, the detection unit, and the interruption unit; 3. The extension cord set according to claim 1, wherein the housing has a recess between adjacent ones of the plug connection portions.

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