JP2008058255A - Voltage detector - Google Patents

Abstract

An object of the present invention is to provide a voltage detector capable of avoiding the occurrence of an electric shock accident.
A voltage detection plate disposed on a main body and connected to a detection circuit, and a lead disposed on one end of a lead wire pulled out from the main body and detected via the lead. A voltage detection plate 25 connected to the circuit 31, and configured to be capable of electrical measurement using at least one of the voltage detection plates 14 and 25 with respect to the measurement object. The body portion 2 is housed in an insulating material tip portion 13 a that constitutes a part of the casing, and the voltage detection plate 25 is disposed at one end portion of the lead wire 21 and is made of an insulating material tip portion 23 a. Is housed inside.
[Selection] Figure 1

Description

  The present invention relates to a voltage detector that includes a pair of electrodes and is configured to perform electrical measurement on a measurement object.

  As this type of voltage detector, a voltage detection device comprising a pair of tester probes used when measuring an AC voltage between lines and a single voltage detection probe used when measuring an AC voltage at a measurement point Is disclosed in JP-A-6-242154. In this voltage detection device, one tester probe and a voltage detection probe are disposed on one end side of the main body (main body), and the other tester is connected to the tip of the lead wire drawn from the other end of the main body. A probe is provided.

In this case, the voltage detector includes a switching cover pivotally supported on one end side of the main body, and the one tester probe is implanted in the switching cover so that the switching cover is attached to the main body. And is configured to be rotatable. Thereby, when one tester probe is not used, it is possible to accommodate one tester probe in the accommodation position in the main body by rotating the switching cover with respect to the main body. For example, when measuring the line voltage (AC voltage) of commercial alternating current using both tester probes, the switching cover is rotated to project one tester probe from the main body. At this time, the detection probe is covered with the switching cover, and the occurrence of an electric shock accident in contact with the detection probe during measurement is avoided.
JP-A-6-242154 (page 3-4, FIG. 1-7)

  However, the conventional voltage detector has the following problems. In other words, in the conventional voltage detection device, the tester probe is implanted in a switching cover that is rotatably arranged with respect to the main body, and is switched when the tester probe is used (when the voltage detection probe is not used). A configuration is adopted in which the detection probe is covered with a cover, and when the detection probe is used (when the tester probe is not used), the test probe is moved to the accommodation position to avoid an electric shock accident. However, in this voltage detection apparatus, when the pair of tester probes is used, the voltage detection probe is covered with the switching cover, but both the tester probes themselves are exposed. Further, when using the voltage detection probe, one tester probe is stored in the accommodation position, but the voltage detection probe itself and the other tester probe are exposed. Therefore, the conventional voltage detector has a problem in that there is a risk of electric shock by touching the tester probe or the voltage detection probe during measurement.

  The present invention has been made in view of such problems, and has as its main object to provide a voltage detector that can avoid the occurrence of an electric shock accident.

  In order to achieve the above object, a voltage detector according to claim 1 is provided at a first electrode disposed in a main body and connected to a detection circuit, and at one end of a lead wire drawn from the main body. And a second electrode connected to the detection circuit via the lead wire, and configured to be capable of electrical measurement using at least one of the electrodes with respect to the measurement object. 1 electrode is accommodated in the 1st electrode accommodating part made from an insulating material which comprises a part of housing | casing in the said main-body part, and the said 2nd electrode is arrange | positioned at the said one end part of the said lead wire. It is housed in a second electrode housing portion made of an insulating material.

  A voltage detector according to claim 2 is the voltage detector according to claim 1, further comprising a lead wire attaching portion for detachably attaching the lead wire to the main body portion, and in place of the lead wire attaching portion. The lid portion is configured to be attachable to the main body portion.

  According to a third aspect of the present invention, in the voltage detector according to the second aspect, the lid is housed in the main body and is connected to a battery electrode that constitutes a reference potential of the detection circuit. A battery connection electrode is provided, and the lead wire attachment portion includes a second battery connection electrode to which the electrode of the battery is connected and to the other end of the lead wire.

  The voltage detector according to claim 4 is the voltage detector according to any one of claims 1 to 3, wherein the first electrode and the second electrode are formed in a plate shape, and the first electrode In the housing part and the second electrode housing part, the housing part for housing the first electrode and the second electrode is formed in a hollow plate shape.

  According to the voltage detector of the first aspect, the first electrode is accommodated in the first electrode accommodating portion made of an insulating material that constitutes a part of the casing in the main body portion, and is disposed at one end portion of the lead wire. Unlike the conventional voltage detection device in which both the tester probe and the voltage detection probe are exposed due to the second electrode being housed in the second electrode housing portion made of an insulating material provided, at the time of measurement As a result of avoiding a situation in which a user's hand directly touches the first and second electrodes and avoiding an electric shock accident reliably, measurement can be performed safely.

  According to the voltage detector of claim 2, the lead wire mounting portion for detachably attaching the lead wire to the main body portion is provided, and the lid portion that can be attached to the main body portion is provided instead of the lead wire mounting portion. As a result, when measuring the voltage to ground, for example, the lead wire etc. can be removed from the main unit to make it more compact, and the cover conductors etc. can be covered with the lid to reliably prevent the occurrence of electric shocks. And safe measurement can be performed.

  According to the voltage detector of the third aspect, the lid is configured by including the first battery connection electrode to be connected to the battery electrode which is housed in the main body and forms the reference potential of the detection circuit, and the battery electrode And the second battery connection electrode to which the other end of the lead wire is connected to form the lead wire attachment portion, so that the lead wire attachment portion can also function as a battery lid. Further, by attaching the lead wire to the lead wire attachment portion that functions as a battery lid, the voltage detector can be configured simply and inexpensively. Furthermore, since the main body of the voltage detector can be used in common, the lead wire, the lead wire attaching portion, and the like can be easily made optional.

  According to the voltage detector of claim 4, the first and second electrodes are formed in a flat plate shape, and the first electrode housing portion and the second electrode housing portion are formed in a hollow flat plate shape, for example, Since the first electrode housing part and the second electrode housing part can be easily inserted into the plug insertion hole of the outlet, whether or not commercial AC is supplied to the electrode in the outlet without removing the outlet cover Can be reliably and easily measured. Therefore, the occurrence of an electric shock accident can be avoided more reliably and the measurement can be performed more safely by the amount that it is not necessary to perform the measurement with the outlet cover removed.

  Hereinafter, the best mode of a voltage detector according to the present invention will be described with reference to the accompanying drawings.

  A voltage detector 1 shown in FIG. 1 includes a main body 2, a signal cable 3, and a rear end side lid (first battery connection electrode in the present invention) 4. The voltage detector 1 has a line voltage (AC voltage) of a predetermined voltage or more between measurement target parts (for example, between lines in an outlet, a distribution board, etc.) in a state where the signal cable 3 is attached to the main body 2 (see FIG. 3). It is configured to be able to inspect (measure) whether or not it is supplied. Whether the voltage detector 1 is supplied with an AC voltage equal to or higher than a predetermined voltage to the measurement object in a state where the rear end side cover 4 is attached to the main body 2 instead of the signal cable 3 (see FIG. 4). It is configured to enable inspection (measurement).

  The main body 2 includes a circuit board 11, a main body grip 12, and a front end side lid 13. A detection circuit 31 shown in FIG. 2 is arranged on the circuit board 11, and a current detection plate 14 corresponding to the first electrode in the present invention, and an LED 16 that emits light when an AC voltage equal to or higher than a predetermined voltage is detected. A buzzer 17 that outputs a buzzer sound when an AC voltage equal to or higher than a predetermined voltage is detected, and a connection conductor 18 to which the negative electrode (reference potential) of the battery 5 is connected and to which the signal cable 3 is connected are disposed. ing.

  In this case, as shown in FIG. 2, the detection circuit 31 includes resistors 32 to 34, a comparator 35, an LED drive circuit 36, and a buzzer drive circuit 37. Here, when measuring the line voltage, the resistor 32 is, for example, an electrode disposed at the back of one plug insertion hole in the outlet and the voltage detection plate 14 inserted into the plug insertion hole. Between the electrode C1 and the electrode disposed in the inner part of the other plug insertion hole in the outlet and the voltage detection plate 25 (see FIG. 1) inserted into the plug insertion hole. The alternating current flowing through the capacitance C2 is converted into a current voltage. The resistors 33 and 34 divide the voltage of the battery 5 and supply the divided voltage to the negative terminal of the comparator 35. The comparator 35 outputs a high-level voltage when the voltage that has been converted from current to voltage by the resistor 32 exceeds the divided voltage by the resistors 33 and 34. When the high level voltage is output from the comparator 35, the LED drive circuit 36 outputs the voltage of the battery 5 to light the LED 16. Further, the buzzer drive circuit 37 operates the buzzer 17 by outputting the voltage of the battery 5 when a high level voltage is output from the comparator 35. Moreover, as shown in FIG. 1, the voltage detection board 14 and the voltage detection board 25 (2nd electrode in this invention) mentioned later are formed in the thin flat form with the metal material, for example.

  As an example, the main body grip 12 is formed in a cylindrical shape with an insulating resin material, and is configured to accommodate the circuit board 11 and the battery 5 in its internal space. Further, a distal end side lid 13 is attached to one end side (the distal end portion side) of the main body grip 12. Further, an attachment portion 12 a to which either the signal cable 3 or the rear end side lid portion 4 can be attached is formed on the other end side (rear end portion side) of the main body grip 12. As an example, the distal end side lid portion 13 is formed of an insulating resin material in the same manner as the main body grip 12. In this case, the distal end portion 13a in the distal end side lid portion 13 corresponds to the first electrode accommodating portion in the present invention, functions as an accommodating portion that accommodates the voltage detection plate 14, and can be connected to the outlet in thickness and width. It is formed in the shape of a hollow plate so as to have a shape equivalent to a simple outlet plug (flat blade).

  The signal cable 3 includes a lead wire 21, an electrode member 22, a voltage detection plate housing portion 23, and a rear end side lid portion 24. The lead wire 21 has a voltage detection plate 25 connected to one end thereof and a voltage detection plate housing portion 23 attached thereto. The other end portion of the lead wire 21 is fixed to the rear end side lid portion 24 and connected to an electrode member (second battery connection electrode) 22 that can be connected to the connection conductor 18 of the main body portion 2. Yes. In this case, when the rear end side lid portion 24 is attached to the attachment portion 12a, the electrode member 22 presses the battery 5 toward the front end side lid portion 13 to thereby set the reference potential (grant potential) of the detection circuit 31. It is connected to the electrode (negative electrode) of the battery 5 to constitute. In this state, the connecting conductor 18 is connected to the electrode member 22. As an example, the detection plate housing portion 23 is formed in a cylindrical shape with an insulating resin material. In this case, the distal end portion 23a in the voltage detection plate housing portion 23 corresponds to the second electrode housing portion in the present invention, functions as a housing portion for housing the current detection plate 25, and serves as a distal end side lid portion in the main body portion 2. In the same manner as the distal end portion 13a of 13, the thickness and width are formed in a hollow flat plate shape so as to have a shape equivalent to an outlet plug (flat blade) connectable to an outlet. The rear end side cover portion 24 corresponds to a lead wire attachment portion in the present invention, and is configured such that the signal cable 3 can be attached to the attachment portion 12 a of the main body grip 12 in the main body portion 2.

  The rear end side cover part 4 corresponds to a cover part in the present invention, and functions as a battery cover for regulating the detachment of the battery 5 from the main body grip 12 in a state where the signal cable 3 is detached from the main body part 2. In addition, the rear end side cover part 4 is configured in substantially the same manner as the rear end side cover part 24 in the signal cable 3, and an electrode member (first battery connection) having the same function as the electrode member 22 is provided on the inner side thereof. Electrode) 4a is attached. In this case, the electrode member 4a is connected to the electrode (negative electrode) of the battery 5 by pressing the battery 5 toward the front end side lid portion 13 when the rear end side lid portion 4 is attached to the attachment portion 12a. The connecting conductor 18 is also connected.

  Using this voltage detector 1, for example, when performing line voltage measurement (an example of electrical measurement using both voltage detection plates 14 and 25) for measuring whether commercial AC is supplied to an outlet. As shown in FIG. 3, the rear end side lid portion 24 is attached to the attachment portion 12 a of the main body portion 2. At this time, the voltage detection plate 25 of the signal cable 3 is connected to the reference potential (in the detection circuit 31 on the circuit board 11 accommodated in the main body 2 via the lead wire 21, the electrode member 22, and the connection conductor 18 ( Electrically connected to the negative potential of the battery 5). Next, the distal end portion 13a of the main body 2 is inserted into one plug insertion hole of the outlet, and the distal end portion 23a of the signal cable 3 is inserted into the other plug insertion hole. At this time, as shown in FIG. 2, when the commercial alternating current (V1, V2) is supplied between the pair of electrodes in the outlet, the above-described capacitance C1, the resistor 32, and the above-described capacitance C2. An alternating current flows through the path, and an alternating voltage is generated across the resistor 32. In this case, when the voltage across the resistor 32 exceeds the voltage supplied to the negative input portion of the comparator 35, the comparator 35 outputs a positive voltage. At this time, the LED drive circuit 36 supplies the voltage of the battery 5 to light the LED 16, and the buzzer drive circuit 37 supplies the voltage of the battery 5 to output a buzzer sound from the buzzer 17. Thereby, it can be recognized that commercial alternating current more than a predetermined voltage is supplied between a pair of electrodes in the outlet.

  In this case, in the voltage detector 1, the voltage detection plate 14 is accommodated in the front end side lid 13 formed of an insulating resin material, and the voltage detection plate 25 is formed of an insulating resin material. It is accommodated in the part 23. Therefore, in a state where the distal end portions 13a and 23a are inserted into the plug insertion holes of the outlet, it is possible to perform measurement safely without causing a situation where the user's hand directly touches the voltage detection plates 14 and 25. Yes.

  On the other hand, whether or not an AC current (for example, AC voltage V1 shown in FIG. 1) of a predetermined voltage or higher is supplied to a predetermined measurement point (for example, one electrode of an outlet) using the voltage detector 1 (between the ground and the ground) When measuring the voltage to ground (an example of electrical measurement using the voltage detection plate 14) for measuring whether or not the AC voltage is equal to or higher than a predetermined voltage, as shown in FIG. Instead of 24, the rear end side lid portion 4 is attached to the main body portion 2. At this time, the attachment portion 12 a of the main body grip 12 in the main body portion 2 is covered with the rear end side lid portion 4. Note that the ground-to-ground voltage measurement can be performed in a state where the rear end side lid portion 24 is attached. Next, the distal end portion 13a of the main body 2 is inserted into one plug insertion hole in the outlet while the main body grip 12 is clamped. At this time, the capacitance C1 between the measurement point and the tip 13a, the resistor 32, the reference potential of the detection circuit 31 (the negative potential of the battery 5), and the resistance R and the capacitance C3 between the ground. An alternating current flows through a path including the parallel circuit, and an alternating voltage is generated across the resistor 32. In this case, when the voltage across the resistor 32 exceeds the voltage supplied to the negative input portion of the comparator 35, the comparator 35 outputs a positive voltage. Also at this time, the LED drive circuit 36 supplies the voltage of the battery 5 to light the LED 16, and the buzzer drive circuit 37 supplies the voltage of the battery 5 to output a buzzer sound from the buzzer 17. Thereby, it can be made to recognize that the alternating voltage more than predetermined voltage is supplied between one electrode in an outlet socket.

  In this case, in the voltage detector 1, as described above, the voltage detection plate 14 is accommodated in the front end side lid portion 13 formed of an insulating resin material, and the attachment portion 12 a from which the signal cable 3 is removed is provided. It is covered with a rear end side lid portion 4 made of an insulating resin material. Therefore, in a state where the distal end portion 13a is inserted into the plug insertion hole of the outlet, the measurement can be safely performed without causing a situation where the user's hand directly touches the voltage detection plate 14 or the connection conductor 18. ing.

  As described above, according to the voltage detector 1, the detection is performed in the distal end portion 13 a (first electrode housing portion) of the distal end side lid portion 13 made of an insulating resin material that constitutes a part of the casing in the main body portion 2. The electrical plate 14 (first electrode) is accommodated, and the distal end portion 23a (second electrode accommodation portion) of the electrical detection plate accommodation portion 23 made of an insulating resin material disposed at one end portion of the lead wire 21 is accommodated. Unlike the conventional voltage detection device in which both the tester probe and the voltage detection probe are exposed because the voltage detection plate 25 (second electrode) is accommodated, the voltage detection plates 14 and 25 are connected to each other at the time of measurement. As a result of avoiding a situation where the user's hand directly touches and avoiding an electric shock accident with certainty, the measurement can be performed safely.

  Further, according to the voltage detector 1, the rear end side lid portion 24 (lead wire attachment portion) to which the lead wire 21 is detachably attached to the main body portion 2 is provided, and the main body is replaced with the rear end side lid portion 24. By including the rear end side lid portion 4 that can be attached to the portion 2, the rear end side lid can be made compact by removing the signal cable 3 from the main body portion 2, for example, when measuring the voltage to ground. The connection conductor 18 and the like can be covered by the part 4 to reliably avoid the occurrence of an electric shock accident and perform safe measurement.

  Further, according to the voltage detector 1, the electrode member 4 a (first battery connection electrode) to which the electrode (negative electrode) of the battery 5 that is housed in the main body 2 and forms the reference potential of the detection circuit 31 is connected. The rear end side cover portion 4 is provided, and the electrode member 22 (second battery connection electrode) to which the electrode (negative electrode) of the battery 5 is connected and the other end portion of the lead wire 21 is connected is provided. By configuring the end-side lid portion 24 (lead wire attaching portion), the rear-end side lid portion 24 can also function as a battery lid. Further, by attaching the lead wire 21 to the rear end side lid portion 24 that functions as a battery lid, the voltage detector 1 can be configured simply and inexpensively. Furthermore, since the main body 2 of the voltage detector 1 can be used in common, the signal cable 3 can be easily made optional.

  Furthermore, according to the voltage detector 1, the voltage detection plates 14 and 25 are formed in a flat plate shape, and the accommodating portions (tip portions) of both the voltage detection plates 14 and 25 in the distal end side lid portion 13 and the voltage detection plate accommodating portion 23. 13a and tip portion 23a) are formed in a hollow flat plate shape, so that tip portions 13a and 23a can be easily inserted into the plug insertion hole of the outlet. Whether or not alternating current is supplied can be reliably and easily measured. Therefore, the occurrence of an electric shock accident can be avoided more reliably and the measurement can be performed more safely by the amount that it is not necessary to perform the measurement with the outlet cover removed.

  In addition, this invention is not limited to said structure and method. For example, the current detection plates 14 and 25 are formed in a flat plate shape, and the receiving portions (the front end portion 13a and the front end portion 23a) of both the current detection plates 14 and 25 in the front end side lid 13 and the detection plate receiving portion 23 are hollow. Although it described above about the example formed in flat form, it is not limited to these shapes, It can comprise in arbitrary shapes, such as a rod shape. Moreover, although the example which applied this invention to the voltage detector 1 which can detect the alternating voltage more than a predetermined voltage was demonstrated, the measurement apparatus comprised so that a measurement result could be displayed numerically, etc., and a measurement result can be recorded. The configuration of the voltage detector according to the present invention (the configuration in which the voltage detection plates 14 and 25 are accommodated in the accommodating portion made of an insulating material) can be applied to the configured recording device or the like. Even with this configuration, it is possible to reliably avoid the occurrence of an electric shock accident in a measuring device, a recording device, or the like.

1 is an exploded perspective view of a voltage detector 1. FIG. FIG. 3 is a circuit diagram of the voltage detector 1 in a state where a signal cable 3 is connected. It is an external appearance perspective view of the voltage detector 1 in a state where the signal cable 3 is connected. It is an external appearance perspective view of the voltage detector 1 in a state where the rear end side lid portion 4 is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric detector 2 Main body part 3 Signal cable 4 Rear end side cover part 4a, 22 Electrode member 5 Battery 14, 25 Electric detection board 11 Circuit board 12 Main body grip 13 Front end side cover part 13a, 23a Front end part 21 Lead wire 23 Electricity detection Plate housing part 24 Rear end side cover part 31 Detection circuit

Claims (4)

A first electrode disposed on the main body and connected to the detection circuit; and a first electrode disposed on one end of a lead wire drawn from the main body and connected to the detection circuit via the lead wire. Two electrodes, and configured to be capable of electrical measurement using at least one of both electrodes with respect to the measurement object,
The first electrode is housed in a first electrode housing portion made of an insulating material that constitutes a part of the housing in the main body portion,
The second electrode is a voltage detector housed in a second electrode housing portion made of an insulating material disposed at the one end of the lead wire.   The lead wire mounting portion for detachably attaching the lead wire to the main body portion, and a lid portion that can be attached to the main body portion instead of the lead wire mounting portion. Voltage detector. The lid portion includes a first battery connection electrode to which a battery electrode that is housed in the main body portion and forms a reference potential of the detection circuit is connected;
The said lead wire attaching part is a voltage detector of Claim 2 provided with the 2nd electrode for battery connection to which the said electrode of the said battery is connected and the other end part of the said lead wire is connected. The first electrode and the second electrode are formed in a flat plate shape,
4. The voltage detector according to claim 1, wherein the first electrode housing portion and the second electrode housing portion are formed in a hollow flat plate shape. 5.

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