Tool with voltage detection function

Abstract

To provide a tool with a voltage detection function, which has a voltage detection function and maintains convenience as a practical tool as a single body.SOLUTION: A tool with a voltage detection function includes a grip part, a tool shaft part, a voltage detection terminal part, a ground terminal part, an amplification voltage detection part, and a voltage detection output part. The grip portion has a compartment structure in which the inside is partitioned on the distal end side. The tool shank has a load portion fixed to the compartment structure and applied with a load when the tool is used, and a voltage detection portion for detecting a voltage detection potential corresponding to a live wire state of a voltage detection object. The voltage detection terminal portion is electrically connected to the tool shaft portion. The ground terminal portion has a potential with respect to the ground by at least a capacitance between the ground terminal portion and the ground. The amplified voltage detection unit amplifies an input difference between the voltage detection terminal unit and the ground terminal unit to detect the voltage. The voltage detection output unit outputs a voltage detection result.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a tool with a voltage detection function. [Background technology]

[0002] BACKGROUND ART Conventionally, a voltage detection screwdriver (a type of tool with a voltage detection function) that is equipped with an integrated voltage detection function has been known.

[0003] This voltage detector driver is used in electrical installation work to check whether electric wires and contacts are live (having AC or DC potential relative to the earth).The voltage detector driver can also be used to detect continuity, making it possible to diagnose the connection or breakage of electric wires.

[0004] In many of these types of voltage detector screwdrivers, the grip section is configured with an outer shell structure (see Figure 3 of Patent Document 1). This outer shell structure is intended to ensure "internal space for placing a voltage detector circuit board" inside the grip section. In this case, the driver shaft (a type of tool shaft) is fixed to the outer shell at the tip of the grip section.

[0005] When tightening or loosening screws with such a voltage-detecting screwdriver, the torsional load tends to concentrate on the thin and fragile outer shell of the grip. As a result, voltage-detecting screwdrivers with an outer shell structure have difficulty turning screws with a force greater than a certain level, and there is room for improvement in terms of increasing their practical strength as a screwdriver.

[0006] Therefore, the applicant disclosed in Patent Document 2 "a voltage detection unit device that is configured to be separable from a driver and that adds a voltage detection function by being attached to the shaft portion of the driver as needed."

[0007] By consolidating the voltage detection function into a separate voltage detection unit device in this way, it is no longer necessary to configure the grip part of the screwdriver with a thin outer shell structure. As a result, the practical strength of the grip part is increased, making it possible to fully withstand the torsional load when tightening or loosening screws. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Utility Model Application Publication No. 05-072370 [Patent Document 2] Patent No. 6732323 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the technique of Patent Document 2 requires a slight increase in the number of steps at the electrical installation site, such as detaching the voltage detection unit device from the driver and managing them separately, so there is room for improvement in terms of convenience.

[0010] Therefore, an object of the present invention is to provide a tool with a voltage detection function that is equipped with a voltage detection function while maintaining convenience as a practical tool on its own. [Means for solving the problem]

[0011] The tool with voltage detection function of the present invention includes a grip portion, a tool shaft portion, a voltage detection terminal portion, a ground terminal portion, an amplified voltage detection portion, and a voltage detection output portion.

[0012] The grip portion has a compartment structure at the tip end, where the compartment is a space supported by dividing the interior with a partition.

[0013] The tool shank has a load portion fixed to the compartment structure of the grip portion and to which a load is applied when the tool is in use, and a voltage detection portion that detects a voltage detection potential corresponding to the live wire state of the object of voltage detection.

[0014] The voltage detection terminal portion is electrically connected to the tool shank portion and has a potential relative to the voltage detection potential.

[0015] The ground terminal has a potential relative to the ground due to at least the capacitance between the ground and the ground.

[0016] The amplifying voltage detector detects voltage by amplifying the input difference between the voltage detector terminal and the ground terminal.

[0017] The voltage detection output unit outputs the result of voltage detection by the amplified voltage detection unit (hereinafter referred to as "voltage detection result"). [Effects of the Invention]

[0018] The tool with voltage detection function of the present invention fixes the tool shaft with a separate chamber structure at the tip of the grip. This fixation structure distributes the load applied during use of the tool to the partitions of the separate chamber structure. As a result, the present invention has higher practical strength as a tool compared to conventional products (see Figure 3 of Patent Document 1) in which the load is concentrated on a thin outer shell structure.

[0019] Therefore, the present invention realizes a tool with a voltage detection function that maintains the convenience of being a practical tool on its own, despite the addition of a voltage detection function.

[0020] Problems, configurations, and effects other than those described above (especially those of the subclaims) will become clear in the following description of the embodiments. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is an external view of a tool 100 with a voltage detector, as viewed from the side. [Figure 2] FIG. 2 is an exploded view showing the assembled configuration of the parts of the voltage detecting tool 100. As shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view showing the AB cross section of the compartment structure 200. As shown in FIG. [Figure 4] FIG. 4 is an exploded perspective view of the grip portion 110 divided into left and right parts. [Figure 5] FIG. 5 is a cutaway view showing the configuration of the light emitting section 171 and the light transmitting cap section 180. As shown in FIG. [Figure 6] FIG. 6 is a diagram illustrating the voltage detection operation of the tool 100 with a voltage detection function. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Example]

[0023] <<Configuration of Example 1>> FIG. 1 is an external view of a tool 100 with a voltage detector, as viewed from the side. FIG. 2 is an exploded view showing the assembled configuration of the parts of the voltage detecting tool 100. As shown in FIG. The general configuration of the voltage detecting tool 100 will be described below with reference to FIGS.

[0024] First, the tool 100 with a voltage detection function includes a grip portion 110, a tool shaft portion 120, an insulating portion 130, a voltage detection terminal portion 140, a ground terminal portion 150, an amplified voltage detection portion 160, a voltage detection output portion 170, a light-transmitting cap portion 180, a test switch portion 190, and a substrate P.

[0025] Of these, the grip portion 110 is the part that holds the tool, and has a spherical grip shape that allows the user to wrap their hand around it and hold it firmly. Furthermore, recesses are formed on the top and bottom of this grip shape to make it easy for fingers to hang on. The grip portion 110 may have a shape that allows it to be fixed to a robot arm or the like, or may have an attachment / detachment mechanism. The grip portion 110 is formed by joining horizontally split grip cores 110a and 110b on the left and right. Furthermore, the grip portion 110 is equipped with grip rubbers 111 and 112 to increase grip strength, and a fixing screw 113.

[0026] The tool shank 120 is fixed by a compartment structure 200 (described in detail later) at the tip side of the grip part 110. This fixed point serves as a load-bearing portion 122, which is configured to withstand the load applied from the grip part 110 to the tool shank 120 by distributing it among the partitions of the compartment structure 200.

[0027] The tool shank 120 also has a voltage detection part 121 (here, the tip of a driver bit) that detects a potential corresponding to the live line state of the voltage detection target 400 (see FIG. 6).

[0028] The insulating portion 130 insulates the exposed portion (preferably the entire area) of the shank side of the tool shank 120 to prevent short-circuiting with the outside. As a result, the potential detected by the voltage detection portion 121 can be efficiently maintained in the tool shank 120. In particular, with the insulating portion 130 of Example 1, the shank portion of the tool shank 120 is entirely covered with an insulating shrink tube or the like, and only a small portion (preferably only the bit tip) of the voltage detection portion 121 is exposed.

[0029] The voltage detection terminal unit 140 is electrically connected (contacts) with the tool shank 120 and has a potential relative to the tool shank 120. In particular, the voltage detection terminal unit 140 is electrically (direct current or alternating current) connected to a side region of the tool shank 120 at a position (for example, the rear end of the tool shank 120) that avoids the range of the load portion 122. This voltage detection terminal unit 140 is connected by wiring to one input terminal of the amplified voltage detection unit 160.

[0030] The ground terminal unit 150 has at least a capacitance (stray capacitance, etc.) between itself and the earth. Due to this capacitance, the ground terminal unit 150 is capacitively coupled to the earth and the user's body, and has a potential relative to the earth (ground potential).

[0031] The amplified voltage detector 160 is disposed on the substrate P, and performs voltage detection by amplifying the input difference (such as the difference in voltage or current) between the voltage detector terminal 140 and the ground terminal 150. For the amplification and voltage detection here, it is preferable to use circuits such as a current amplifier circuit (a voltage buffer with low impedance output), a voltage amplifier circuit (an amplifier that amplifies a small input difference), a filter, and a comparator. The power source for this amplified voltage detector 160 is a battery chamber (battery contacts 161a to 161c, battery cover 161d, and battery X) disposed in the grip 110.

[0032] The voltage detection output unit 170 is disposed on the substrate P or the like, and outputs the voltage detection result from the amplified voltage detection unit 160 by light emission, sound (buzzer, voice, etc.), display, vibration, etc. In particular, in the first embodiment, the light emitting unit 171 of the voltage detection output unit 170 is disposed on the substrate P protruding from the tip side of the grip unit 110, and emits light (turns on, turns off, blinks, changes color, etc.) according to the voltage detection result. Note that the output of the voltage detection output unit 170 here may be notified to an external device (smartphone, PC, etc.) wirelessly or via a line, etc.

[0033] The top of the light-transmitting cap portion 180 has a structure (hereinafter referred to as "loose structure G") that allows the tool shank 120 to pass through in an unsecured state. In this state, the bottom edge of the light-transmitting cap portion 180 is fixed (screwed, etc.) in the form of a cap to the tip side of the grip portion 110. This light-transmitting cap portion 180 covers the light-emitting portion 171 of the voltage detection output portion 170 and transmits (diffuses, etc.) light. The tool shank 120 and the light-transmitting cap portion 180 are insulated from each other via the insulating portion 130.

[0034] The test switch section 190 is composed of a test circuit arranged on the substrate P and an operation button exposed from the side portion of the grip section 110. Such a test switch section 190 performs an operation check of the voltage detection function (such as checking the remaining capacity of the battery X, checking the circuit function of the amplified voltage detection section 160, or checking the output function of the voltage detection output section 170) in response to a switch operation by the user. The result of the operation check is output via the voltage detection output section 170.

[0035] <<Configuration of the Separate Room Structure 200>> Next, the compartment structure 200 for fixing the load portion 122 will be described in more detail.

[0036] FIG. 3 is a cross-sectional view showing the AB cross section of the compartment structure 200. As shown in FIG. FIG. 4 is an exploded perspective view of the grip portion 110 divided into left and right parts. The configuration of the compartment structure 200 will be described below with reference to FIGS. First, the grip portion 110 is divided into a pair of grip cores 110a and 110b. By aligning and joining these grip cores 110a and 110b, a separate chamber structure 200 is formed inside the tip end of the grip portion 110, with a tool chamber 220 and a voltage detector chamber 230 spaced apart from each other at the top and bottom.

[0037] The boundary between these compartments is defined by a partition formed by abutting a partition wall 210a on the grip core 110a side and a partition wall 210b on the grip core 110b side.

[0038] The end of the tool shank 120 is inserted into the tool chamber 220. At this time, the tool chamber 220 fits into the load portion 122 (a non-rotating body having a pair of opposing surfaces) to fix the tool shank 120.

[0039] As a mechanism for this fitting, a clamping member 240 is provided on the grip core 110a side to prevent rotation by clamping the opposing surface of the load portion 122. Furthermore, a locking member 250 is provided on the grip core 110b side to clamp the clamping member 240 from the outside and prevent it from opening.

[0040] The clamping member 240 and the locking member 250 firmly clamp the load portion 122 of the tool shank 120. Therefore, the load (torsional load, etc.) applied from the grip portion 110 to the tool shank 120 during use of the tool can be dispersed and withstood by the partitions of the separate chamber structure 200 (particularly the clamping region).

[0041] <<Configuration of the Light-Emitting Section 171 and the Light-Transmitting Cap Section 180>> Next, the configurations of the light emitting section 171 and the light transmitting cap section 180 will be described in detail.

[0042] FIG. 5 is a cutaway view showing the configuration of the light emitting section 171 and the light transmitting cap section 180. As shown in FIG. 5, an opening 231 of the voltage detector chamber 230 is provided on the tip side of the grip part 110. From this opening 231, the tip of the substrate P inserted in the voltage detector chamber 230 protrudes above the tool shank 120. The light emitting part 171 of the voltage detector output part 170 is disposed on the protruding part of the substrate P. This protruding part is insulated from the tool shank 120 by partition walls 210a, 210b and the insulating part 130.

[0043] On the other hand, the light-transmitting cap portion 180 has the bottom edge of the cap fixed to the tip side of the grip portion 110, with the tool shank 120 penetrating the top of the cap. This light-transmitting cap portion 180 is formed in the shape of a transparent outer shell, covers the light-emitting portion 171 (i.e., the protruding portion of the substrate P), and transmits or diffuses the light of the light-emitting portion 171 to the surroundings.

[0044] In addition, the tool shank 120 has a "loose structure G" that allows it to pass through the light-transmitting cap 180 in an unsecured state. Therefore, the light-transmitting cap 180 is isolated from the transmission path of the load applied from the grip part 110 to the tool shank 120 when the tool is in use.

[0045] Voltage detection operation of Example 1 Next, the voltage detection operation of the first embodiment will be described. FIG. 6 is a diagram illustrating the voltage detection operation of the tool 100 with a voltage detection function.

[0046] (1) Live line voltage detection operation First, the voltage detection operation when the power supply 410 is turned on (energized) will be described with reference to FIG.

[0047] The object of voltage detection 400 is connected to the live side of the power supply 410 in the ON state via an electric wire or a circuit (not shown). The voltage detection portion 121 of the tool shaft 120 is in contact with or close to (capacitively coupled with) the live object of voltage detection 400 (or its electric wire coating portion 401). In this state, a potential corresponding to the object of voltage detection 400 is generated in the voltage detection portion 121.

[0048] On the other hand, the ground side terminal of the power supply 410 is grounded to the earth via a ground wire 420. Between this earth and the ground terminal portion 150, a floating electrostatic capacitance C10 is generated.

[0049] When the user (eg, a finger) comes into contact with or approaches the ground terminal 150, a floating electrostatic capacitance may occur between the ground terminal 150 and the earth via the human body.

[0050] In this situation, the input terminals of the amplified voltage detector 160 form a closed circuit that passes through the following nodes [A] to [M]. [A] Hot terminal of power supply 410 [B] Voltage detection target 400 (or wire coating 401) [C] Electrical detection portion 121 of tool shaft portion 120 [D] Tool shaft part 120 [E] Voltage detection terminal section 140 [F] Input of the amplified voltage detector 160 on the voltage detector terminal 140 side [G] Input impedance of the amplified voltage detector 160 [H] Input on the ground terminal 150 side of the amplified voltage detector 160 [I] Ground terminal part 150 [J] Floating capacitance to earth C10 (or floating capacitance via the human body) [K] Earth [L] Ground wire 420 [M] Ground terminal of power supply 410

[0051] This closed circuit includes the power supply 410 in the ON state in series, and therefore AC, DC, pulsating current, or the like is supplied from the power supply 410. Therefore, a significant input difference (such as a difference in voltage or current) exceeding the noise potential occurs between the voltage detection terminal unit 140 and the ground terminal unit 150 (between the input terminals of the amplified voltage detection unit 160).

[0052] The amplifying voltage detector 160 detects this significant input difference by amplifying, detecting, and judging it against a threshold, and outputs the voltage detection result indicating the live line state from the voltage detector output unit 170.

[0053] (2) Voltage detection operation in a non-live state Next, referring to FIG. 6, a voltage detection operation when the power supply 410 is in the OFF state (non-energized) will be described.

[0054] In this state, no AC, DC, or pulsating current is supplied to the closed circuit of the nodes [A] to [M] from the power supply 410. Therefore, no significant input difference (such as a difference in voltage or current) exceeding the noise potential occurs between the voltage detection terminal unit 140 and the ground terminal unit 150 (the input terminal of the amplified voltage detection unit 160).

[0055] Therefore, the amplified voltage detector 160 does not detect a significant input voltage difference, and outputs a voltage detection result indicating a non-live line state from the voltage detector output unit 170.

[0056] Effect of Example 1 The above-described first embodiment provides the following effects.

[0057] (1) In Example 1, the load-bearing portion 122 of the tool shank 120 is fixed by the separate chamber structure 200 on the tip side of the grip portion 110. This separate chamber structure 200 is stronger than a thin outer shell structure (see FIG. 3 of Patent Document 1) because the interior is partitioned. Therefore, Example 1 is superior in that the tool shank 120 is supported by the separate chamber structure 200, thereby increasing the practical strength of the tool.

[0058] (2) In Example 1, the voltage detection terminal 140 acquires the voltage detection potential by making electrical contact with the tool shank 120. In this case, if a load is applied to the voltage detection terminal 140 during use of the tool, the electrode portion of the voltage detection terminal 140 may bend, resulting in poor contact. However, in Example 1, the voltage detection terminal 140 is isolated from the transmission path of the load applied from the grip portion 110 to the tool shank 120 during use of the tool. Therefore, the load during use of the tool hardly acts on the voltage detection terminal 140, and poor contact of the voltage detection terminal 140 can be avoided. Therefore, Example 1 is superior in that poor contact of the voltage detection terminal 140 can be prevented by isolating the voltage detection terminal 140 from the load portion 122.

[0059] (3) In Example 1, the light emitting unit 171 protrudes from the tip end of the grip unit 110 and is positioned on the tool shaft unit 120. In conventional voltage detector screwdrivers, the voltage detector lamp is easily hidden by the fingers gripping the grip, making the voltage detection result difficult to see. However, in Example 1, when the user grips the grip unit 110 (grip rubbers 111, 112), the light emitting unit 171 protrudes from the tip end of the grip unit 110, so there is little risk of it being hidden by the user's fingers. Therefore, Example 1 is superior in that the voltage detection result is highly visible.

[0060] (4) In Example 1, the light-transmitting cap portion 180 is fixed to the tip side of the grip portion 110. This light-transmitting cap portion 180 covers the light-emitting portion 171 in an outer shell shape. Therefore, Example 1 is advantageous in that the light-transmitting cap portion 180 protects the protruding light-emitting portion 171 while guiding light from the light-emitting portion 171 to the surroundings.

[0061] (5) In Example 1, the light-transmitting cap portion 180 is formed in a thin outer shell shape to allow good transmission of light from the light-emitting portion 171. Normally, such an outer shell-shaped part is prone to breakage if a load is concentrated on it during tool use. However, the light-transmitting cap portion 180 has a "loose structure G through which the tool shank 120 passes in an unsecured state." Because the load is not transmitted through this loose structure G, no load is applied from the light-transmitting cap portion 180 to the tool shank 120. Therefore, Example 1 is superior in that, even though the light-transmitting cap portion 180 is an outer shell-shaped part that allows light to pass through, it is possible to prevent breakage of the light-transmitting cap portion 180.

[0062] (6) In Example 1, the substrate P is placed over the tool shank 120 in the narrow space at the tip of the grip portion 110. Normally, it is difficult to place the substrate P and the tool shank 120 one on top of the other in such a narrow space because they are close to each other and structurally interfere with each other. However, in Example 1, the interior of the tip side of the grip portion 110 is divided into upper and lower sections by partitions 210a and 210b, providing dedicated placement spaces for the tool chamber 220 and the voltage detector chamber 230. Therefore, Example 1 is advantageous in that the tool shank 120 and the substrate P are each placed in their own dedicated chamber structures 200, thereby avoiding structural interference between the tool shank 120 and the substrate P in the narrow space.

[0063] (7) In Example 1, the light-emitting unit 171 is provided on the outside of the grip unit 110 to improve visibility. Normally, in such an arrangement, the light-emitting unit 171 on the outside of the grip and the electroscopic board on the inside of the grip are separated, which requires additional wiring and connectors to extend the electroscopic board to the light-emitting unit 171, complicating the configuration for electroscopic detection. However, in Example 1, a separate chamber structure 200 is employed in which the board P passes over the tool shank 120 in a narrow area at the tip of the grip unit 110. As a result, it is possible to consolidate the electroscopic function from the amplified electroscopic unit 160 inside the grip to the light-emitting unit 171 outside the grip onto a single board P. Therefore, Example 1 is advantageous in that the separate chamber structure 200 enables the electroscopic function to be consolidated onto a single board P, thereby simplifying the configuration for electroscopic detection.

[0064] (8) In Example 1, the clamping member 240 and the locking member 250 are provided. The engagement of these two members firmly clamps the load portion 122. Therefore, Example 1 is advantageous in that the clamping member 240 and the locking member 250 enable the tool shank 120 to be firmly fixed to the compartment structure 200.

[0065] (9) In Example 1, the clamping member 240 is provided on one grip core 110a, and the locking member 250 is provided on the other grip core 110b, facing it. Therefore, by inserting the tool shank 120 in the middle and aligning the grip cores 110a, 110b, the clamping member 240 and the locking member 250 naturally interlock, completing a structure that firmly fixes the load portion 122. Therefore, Example 1 is advantageous in that the tool shank 120 can be fixed to the separate chamber structure 200 by a simple assembly in which the grip cores 110a, 110b are joined from the left and right.

[0066] <<Supplementary information on embodiments, etc.>> In the above-described embodiment, a voltage detection screwdriver has been described as a preferred example of the voltage detection tool 100. However, the present invention is not limited to any particular type of tool as long as it is a tool that has a voltage detection function.

[0067] In the above-described embodiment, an example has been described in which the test switch unit 190 is used for an "operation check." However, the present invention is not limited to this. The light emitted by the test switch unit 190 may be used for "lighting purposes" by guiding or diffusing it with the light-transmitting cap unit 180 or the like. In this case, the user can operate the test switch unit 190 for the purpose of "lighting purposes" to illuminate the area where the tool is being used, and simultaneously complete the "operation check."

[0068] Furthermore, in the above-described embodiment, the case where the amplified voltage detector 160 detects a binary voltage detection result of (live / non-live) has been described. However, the detection of the voltage detection result is not limited to this. For example, the amplified voltage detector 160 may detect the live line status of the power source 410 or the like (power source type, conduction state, voltage detection voltage value, voltage detection waveform, etc.), and output the voltage detection result from the voltage detection output unit 170.

[0069] In the above-described embodiment, the structure is described in which the tool shank 120 is not replaced. However, the tool size and type of the tool shank 120 may be changed by the user as needed.

[0070] For example, the tip bit of the tool shank 120 (which also serves as the voltage detection portion 121 of the tool shank 120) may be made replaceable.

[0071] Furthermore, for example, the grip portion 110 may be provided with a replacement mechanism (which also serves as the load portion 122 of the tool shank 120) that inserts and removes the tool shank 120 without fastening it in place. In this case, it is preferable that the voltage detection terminal portion 140 be configured to be electrically connected to the tool shank 120 and the replacement mechanism at a position that avoids the range of the load portion 122.

[0072] Furthermore, in the above-described embodiment, an example has been described in which a single load portion 122 is provided. However, a plurality of load portions 122 may be provided. In this case, it is preferable that the voltage detection terminal portion 140 is electrically connected to the tool shank portion 120 at a position that avoids the dispersion region (range) of the load portions 122.

[0073] In the above-described embodiment, a structure (see FIG. 1) in which a single voltage detection terminal 140 is provided is illustrated. However, a plurality of voltage detection terminals 140 may be provided in dispersed regions. In this case, even if contact conduction of some of the voltage detection terminals 140 is interrupted due to vibration or the like, contact conduction is maintained stably in the other voltage detection terminals 140, so that instability of the voltage detection operation (such as blinking of the voltage detection lamp) can be avoided.

[0074] Furthermore, in the above-described embodiment, the positions of the voltage detection terminal 140, the ground terminal 150, etc. (see FIG. 2) are illustrated. However, the positions of the voltage detection terminal 140 and the ground terminal 150 are not limited to the positions illustrated in the embodiment, as long as they are positions that realize the voltage detection function described above.

[0075] For example, in the above-described embodiment, a structure in which the voltage detection terminal portion 140 and the ground terminal portion 150 are arranged in the internal void (space with low dielectric constant) of the light-transmitting cap portion 180 to reduce the capacitive coupling between the two terminals and thereby increase the voltage detection sensitivity of the voltage detection terminal portion 140 is also preferable.

[0076] Furthermore, an adjustment unit (manual or automatic) for voltage detection sensitivity may be added to the above-described embodiment. By changing the voltage detection sensitivity between insensitive and sensitive using the adjustment unit, it becomes possible to quickly respond to a variety of voltage detection targets and voltage detection environments.

[0077] It should be noted that the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to an embodiment having all of the described configurations and functions.

[0078] Furthermore, it is possible to replace part of the configuration of the first embodiment with another configuration, and it is also possible to add or delete configurations. [Explanation of symbols]

[0079] 100...Tool with voltage detection function, 110...Grip portion, 110a...Grip core, 110b...Grip core, 120...Tool shaft portion, 121...Voltage detection portion, 122...Load portion, 130...Insulating portion, 140...Voltage detection terminal portion, 150...Ground terminal portion, 160...Amplified voltage detection portion, 161a to 161c...Battery contacts, 161d...Battery cover, 170...Voltage detection output portion, 171...Generator Optical section, 180...light-transmitting cap section, 190...test switch section, 200...chamber structure, 210a...partition wall, 210b...partition wall, 220...tool compartment, 230...voltage detection compartment, 231...opening, 240...clamping member, 250...locking member, 400...voltage detection target, 401...wire coating section, 410...power supply, 420...grounding wire, G...loose structure, P...board, X...battery

Claims

1. a grip portion having a compartment structure at the tip end thereof, the compartment structure being divided into compartments; a tool shank having a load portion fixed to the separate chamber structure of the grip portion and to which a load is applied when the tool is used, and a voltage detection portion that detects a voltage detection potential corresponding to the state of a live wire that is the subject of voltage detection; a voltage detection terminal portion electrically connected to the tool shank portion and having a potential relative to the voltage detection potential; a ground terminal portion having a potential relative to the ground due to at least an electrostatic capacitance between the ground and the ground; an amplifying voltage detector that amplifies an input difference between the voltage detector terminal and the ground terminal and detects voltage; a voltage detection output unit that outputs the voltage detection result by the amplified voltage detection unit (hereinafter referred to as "voltage detection result"); A tool with a voltage detection function.

2. The tool with a voltage detection function according to claim 1, The voltage detection terminal is electrically connected to the tool shank at a position that avoids the range of the load portion. The voltage detection terminal is isolated from the transmission path of the load applied from the grip portion to the tool shank when the tool is in use. A tool with a voltage detection function.

3. The tool with a voltage detection function according to claim 1, a light emitting portion that is disposed on the tool shank and protrudes from the tip end side of the grip portion, and that emits light in response to the voltage detection result; a light-transmitting cap portion that is fixed to the tip side of the grip portion while the tool shank passes through and that covers the light-emitting portion in an outer shell shape; A tool with a voltage detection function.

4. The tool with a voltage detection function according to claim 3, By providing a "loose structure" in which the tool shank passes through the light-transmitting cap in a non-fixed state, The light-transmitting cap portion is isolated from the transmission path of the load applied from the grip portion to the tool shank when the tool is in use. A tool with a voltage detection function.

5. The tool with a voltage detection function according to claim 3, The separate chamber structure divides the inside of the tip side of the grip part into upper and lower compartments, a tool compartment for fixing the tool shank; a voltage detector compartment in which a substrate for the amplified voltage detector is disposed through the tool compartment; The light emitting unit is installed on the substrate protruding from the opening at the tip end of the voltage detection chamber. A tool with a voltage detection function.

6. The tool with a voltage detection function according to claim 1, the load portion of the tool shank has a shape of a non-rotating body having a pair of opposing surfaces, The grip portion is configured by connecting a pair of grip cores to each other on the left and right, One of the grip cores has a clamping member that clamps the pair of opposing surfaces to prevent rotation of the load portion, The other grip core has a locking member that grips the clamping member from the outside and prevents the clamping member from opening. A tool with a voltage detection function.

Images