WO2021140617A1 - Electric tool - Google Patents

Electric tool Download PDF

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Publication number
WO2021140617A1
WO2021140617A1 PCT/JP2020/000471 JP2020000471W WO2021140617A1 WO 2021140617 A1 WO2021140617 A1 WO 2021140617A1 JP 2020000471 W JP2020000471 W JP 2020000471W WO 2021140617 A1 WO2021140617 A1 WO 2021140617A1
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WO
WIPO (PCT)
Prior art keywords
bit
main body
power
grounded
battery
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Application number
PCT/JP2020/000471
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French (fr)
Japanese (ja)
Inventor
麦平 田中
Original Assignee
三菱電機ビルテクノサービス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機ビルテクノサービス株式会社 filed Critical 三菱電機ビルテクノサービス株式会社
Priority to PCT/JP2020/000471 priority Critical patent/WO2021140617A1/en
Priority to CN202080091697.1A priority patent/CN114901446A/en
Priority to JP2021569668A priority patent/JPWO2021140617A1/ja
Publication of WO2021140617A1 publication Critical patent/WO2021140617A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling

Definitions

  • the present invention relates to a power tool.
  • Patent Document 1 describes a cord reel.
  • a power tool is connected to the cord reel described in Patent Document 1.
  • the bit of the power tool connected to the cord reel comes into contact with the metal member inside the concrete, the power supply to the power tool is cut off.
  • An object of the present invention is to provide a power tool capable of efficiently performing work and detecting that a bit has come into contact with a metal member.
  • the electric tool according to the present invention has a main body, a battery supported by the main body, a metal bit supported by the main body and extending in the first direction from the main body, and power is supplied from the battery in the first direction.
  • a driving means for vibrating the bit along the line a connecting means having a ground terminal electrically connected to the bit, a detecting means for detecting that the bit is grounded, and a detecting means for detecting that the bit is grounded.
  • a shutoff means for shutting off the power supply from the battery to the drive means is provided.
  • the power tool according to the present invention has a main body, a plug with a ground terminal, a power cord extending from the main body, a metal bit supported by the main body and extending in the first direction from the main body, and a plug connected to the main body.
  • the driving means for vibrating the bit along the first direction, the detecting means for detecting that the bit is grounded, and the detecting means for detecting that the bit is grounded are detected.
  • a shutoff means for shutting off the power supply from the power supply to the drive means.
  • the power tool according to the present invention it is possible to detect that the bit has come into contact with a metal member, and further, the work can be performed efficiently.
  • FIG. 1 It is a figure which shows the example of the power tool in Embodiment 1.
  • FIG. 2 It is a figure for demonstrating the function which a power tool has. It is a figure which shows typically the example which uses the electric tool in the repair work of an elevator. It is a flowchart which shows the operation example of the power tool in Embodiment 1. It is a figure which shows another example of the power tool in Embodiment 1.
  • FIG. 1 shows the example of the power tool in Embodiment 1.
  • FIG. 1 is a diagram showing an example of a power tool 1 according to the first embodiment.
  • FIG. 2 is a diagram for explaining the function of the power tool 1.
  • the power tool 1 is used for scraping concrete, for example, in an elevator repair work.
  • the power tool 1 includes a main body 2, a battery 3, a bit 4, a lamp 5, and a ground wire 6.
  • the main body 2 is provided with a handle 8 for the person using the power tool 1 to grasp.
  • the main body 2 includes a switch 9 for a person who grips the handle 8 to operate the main body 2.
  • FIG. 1 shows an example in which the main body 2 includes a button-type switch 9. Further, the main body 2 includes a drive unit 11, a detection unit 12, a blocking unit 13, and a lighting unit 14.
  • the battery 3 is supported by the main body 2.
  • the battery 3 may be detachable from the main body 2.
  • the electric power required for the power tool 1 is supplied from the battery 3.
  • Bit 4 is a metal rod-shaped member for actually shaving concrete.
  • the bit 4 is a metal concrete drill bit.
  • the bit 4 is supported by the main body 2 so as to extend from the main body 2 in a specific direction.
  • the direction in which the bit 4 extends from the main body 2 is also referred to as the A direction.
  • the bit 4 is supported by the main body 2 so as to be displaceable along the A direction. Further, the bit 4 may be supported by the main body 2 so as to be rotatable around the A direction.
  • the lamp 5 is provided on the main body 2.
  • the lamp 5 is arranged at a position visible to the person holding the handle 8.
  • the ground wire 6 is an example of means for being connected to a member that is grounded.
  • the grounded member is also referred to as a grounded member.
  • the ground wire 6 extends from the main body 2.
  • the ground wire 6 has a ground terminal 6a at its tip.
  • the ground terminal 6a is electrically connected to the bit 4.
  • the drive unit 11 drives the bit 4 by being supplied with electric power from the battery 3. For example, when power is supplied from the battery 3, the drive unit 11 vibrates the bit 4 along the A direction. Further, the drive unit 11 rotates the bit 4 around the A direction when power is supplied from the battery 3. When a specific operation is performed on the switch 9, the electric power from the battery 3 is supplied to the drive unit 11. For example, if the main body 2 includes a button-type switch 9, the bit 4 vibrates and rotates when the switch 9 is pressed.
  • the detection unit 12 detects that the bit 4 has been grounded. Inside the main body 2, the bit 4 is electrically connected to the battery 3. The ground terminal 6a is electrically connected to the battery 3. When a specific operation is performed on the switch 9, a potential difference is generated between the bit 4 and the ground terminal 6a according to the output voltage of the battery 3. For example, the detection unit 12 detects that the bit 4 is grounded when the resistance value between the bit 4 and the ground terminal 6a is smaller than the reference value.
  • FIG. 3 is a diagram schematically showing an example in which the power tool 1 is used in the repair work of the elevator.
  • FIG. 4 is a flowchart showing an operation example of the power tool 1 according to the first embodiment.
  • the worker moves the power tool 1 onto the car 21 with the power tool 1.
  • the ground terminal 6a of the ground wire 6 is connected to the grounded member in the hoistway 22.
  • FIG. 3 shows an example in which the sill 23 is welded and fixed to the reinforcing bar 24 via the reinforcing brace 25.
  • the threshold 23 and the brace 25 are made of metal.
  • the threshold 23 and the brace 25 are examples of grounded members arranged in the hoistway 22.
  • the worker may connect the ground terminal 6a to the threshold 23 before performing the chipping work with the power tool 1 on the car 21 in the repair work of the elevator.
  • the threshold 23 is provided at each landing.
  • the operator may connect the ground terminal 6a to the threshold 23 arranged at the height closest to the work place.
  • FIG. 3 shows an example in which the ground wire 6 is connected to the sill 23 by sandwiching the sill 23 with the ground terminal 6a. In the example shown in FIG. 3, the operator can easily attach the ground terminal 6a to the grounded member even from above the car 21.
  • the threshold 23 may be replaced. Even if the threshold 23 is removed, the reinforcing bars 24 or braces 25 to which the threshold 23 is fixed are left in the hoistway 22. If the sill 23 has already been removed, the operator may connect the ground terminal 6a to the reinforcing bar 24 or the brace 25 before performing the chipping work with the power tool 1.
  • S101 determines Yes. If it is determined to be Yes in S101, power is supplied from the battery 3 to the drive unit 11. As a result, the drive unit 11 drives the bit 4 (S102). In the example shown in this embodiment, in S102, the bit 4 vibrates along the A direction and rotates about the A direction.
  • the detection unit 12 determines whether or not the bit 4 is grounded (S103).
  • FIG. 3 shows an example in which a metal pipe 26 for protecting an electric wire is buried inside concrete. The metal tube 26 is grounded. Further, as described above, the ground terminal 6a is connected to the grounded member. Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the detection unit 12 detects that the bit 4 is grounded (Yes in S103).
  • the cutoff unit 13 cuts off the power supply from the battery 3 to the drive unit 11 (S104). Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the vibration and rotation of the bit 4 are immediately stopped. This makes it possible to prevent the metal tube 26 from being damaged and the bit 4 from being damaged.
  • the lighting unit 14 lights the lamp 5 (S105). By looking at the lit lamp 5, the operator can know that the bit 4 has come into contact with a metal member such as the metal tube 26.
  • the lamp 5 is an example of a notification device provided in the main body 2.
  • the lighting unit 14 is an example of a notification unit that controls the notification device.
  • the lighting unit 14 lighting the lamp 5 is an example of the notification unit operating the alarm.
  • the main body 2 may be provided with a buzzer as a notification device. In such a case, the notification unit sounds the buzzer in S105.
  • the main body 2 may be provided with both a lamp 5 and a buzzer as an alarm. In such a case, the notification unit turns on the lamp 5 and sounds the buzzer in S105.
  • the power tool 1 can detect that the bit 4 comes into contact with a metal member such as a metal tube 26 during the chipping operation. Therefore, the operator does not need to carry the cord reel with the metal sensor onto the car 21 when performing the chipping work on the car 21. The operator does not need to perform the chipping work with the cord reel placed on the car 21, and the work can be performed efficiently.
  • the power tool 1 may be adopted by combining a plurality of functions shown below.
  • the main body 2 of the power tool 1 may further include a conversion unit 15 as shown in FIG.
  • the conversion unit 15 converts the direct current from the battery 3 into alternating current.
  • the alternating current from the conversion unit 15 is supplied to the drive unit 11.
  • the bit 4 is electrically connected to the conversion unit 15.
  • the ground terminal 6a is electrically connected to the conversion unit 15.
  • FIG. 5 is a diagram showing another example of the power tool 1 according to the first embodiment.
  • the power tool 1 includes a main body 2, a bit 4, a lamp 5, and a power cord 7.
  • the power cord 7 extends from the main body 2.
  • the power cord 7 has a plug 7a with a ground terminal.
  • the ground terminal of the plug 7a is electrically connected to the bit 4.
  • the main body 2 includes a handle 8 and a switch 9. Further, the main body 2 includes a drive unit 11, a detection unit 12, a blocking unit 13, and a lighting unit 14.
  • a grounded outlet 27 is often provided on the car 21 for maintenance personnel who maintain the elevator.
  • the operator may connect the plug 7a to the outlet 27 before starting the chipping work.
  • the electric power required for the power tool 1 is supplied from a commercial power source via a plug 7a connected to the outlet 27.
  • the drive unit 11 drives the bit 4 by supplying electric power from a commercial power source to which the plug 7a is connected. For example, when power is supplied from the commercial power source, the drive unit 11 vibrates the bit 4 along the A direction and rotates the bit 4 around the A direction.
  • the electric power from the commercial power source is supplied to the drive unit 11 by performing a specific operation on the switch 9.
  • the detection unit 12 detects that the bit 4 is grounded, for example, when the resistance value between the ground terminal of the bit 4 and the plug 7a is smaller than the reference value. Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the detection unit 12 detects that the bit 4 is grounded.
  • the cutoff unit 13 cuts off the power supply from the commercial power supply to which the plug 7a is connected to the drive unit 11. Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the vibration and rotation of the bit 4 are immediately stopped. This makes it possible to prevent the metal tube 26 from being damaged and the bit 4 from being damaged.
  • the lighting unit 14 lights the lamp 5. At this time, the buzzer provided on the main body 2 may sound. By looking at the lit lamp 5, the operator can know that the bit 4 has come into contact with a metal member such as the metal tube 26.
  • the outlet 27 may be removed from the top of the car 21.
  • the power tool 1 preferably includes a battery 3 and a ground wire 6.
  • the power tool 1 may include both a power cord 7, a battery 3, and a ground wire 6.
  • each part indicated by reference numerals 11 to 15 indicates a function possessed by the main body 2 of the power tool 1.
  • the function of the main body 2 is realized by, for example, dedicated hardware. Some of the functions of the main body 2 may be realized by software.
  • the main body 2 includes a processing circuit including a processor and a memory as hardware resources. The main body 2 realizes the above-mentioned part of the function by executing the program stored in the memory by the processor.
  • the present invention can be applied to a power tool in which a bit can unintentionally come into contact with a metal member while the bit is being driven.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Drilling And Boring (AREA)

Abstract

An electric tool (1) is provided with a body (2), a battery (3), a bit (4) made of metal, a drive unit (11), a ground wire (6), a detection unit (12), and a cutoff unit (13). The drive unit (11) oscillates the bit (4) when electric power is supplied thereto from the battery (3). The detection unit (12) detects that the bit (4) is grounded. The cutoff unit (13) cuts off electric power supplied from the battery (3) to the drive unit (11) when the detection unit (12) detects that the bit (4) is grounded.

Description

電動工具Electric tool
　この発明は、電動工具に関する。 The present invention relates to a power tool.
　例えば、エレベーターの改修工事では、コンクリートを削るために電動工具が用いられる。コンクリートの内部には、電線を保護するための金属管が埋められている。他の例として、コンクリートの内部には鉄筋が埋められている。改修工事を行う作業者は、金属管等の金属部材の正確な位置は分からない。電動工具のビットが金属部材に接触すると、ビットが破損したり、金属部材が破損したりしてしまう。 For example, in elevator repair work, power tools are used to scrape concrete. Inside the concrete, a metal pipe is buried to protect the electric wire. As another example, the inside of concrete is filled with reinforcing bars. Workers performing repair work do not know the exact position of metal members such as metal pipes. When the bit of the power tool comes into contact with the metal member, the bit is damaged or the metal member is damaged.
　特許文献１に、コードリールが記載されている。例えば、特許文献１に記載されたコードリールに電動工具が接続される。当該コードリールに接続された電動工具のビットがコンクリート内部の金属部材に接触すると、電動工具への給電が遮断される。 Patent Document 1 describes a cord reel. For example, a power tool is connected to the cord reel described in Patent Document 1. When the bit of the power tool connected to the cord reel comes into contact with the metal member inside the concrete, the power supply to the power tool is cut off.
日本実用新案登録第３２１９６１３号公報Japan Utility Model Registration No. 3219613
　エレベーターの改修工事では、コンクリートを削るために様々な高さで電動工具が使用される。例えば、作業者は、エレベーターのかごの上に乗って、コンクリートを削る作業を行う。特許文献１に記載されたコードリールを用いてこのような作業を行う場合、作業者は、電動工具とともにコードリールをかごの上に搬入しなければならない。また、作業者は、コードリールをかごの上に置いた状態でコンクリートを削る作業を行わなければならない。このため、コードリールが作業の邪魔になり、作業性が悪いといった問題があった。このような問題は、エレベーターの改修工事だけでなく、他の工事においても同様に発生し得る。 In elevator repair work, power tools are used at various heights to scrape concrete. For example, a worker rides on an elevator car and scrapes concrete. When performing such an operation using the cord reel described in Patent Document 1, the operator must carry the cord reel onto the car together with the electric tool. In addition, the worker must perform the work of shaving the concrete with the cord reel placed on the basket. For this reason, there is a problem that the cord reel interferes with the work and the workability is poor. Such a problem can occur not only in elevator repair work but also in other works as well.
　この発明は、上述のような課題を解決するためになされた。この発明の目的は、作業を効率的に行うことができ、且つビットが金属部材に接触したことを検出できる電動工具を提供することである。 This invention was made to solve the above-mentioned problems. An object of the present invention is to provide a power tool capable of efficiently performing work and detecting that a bit has come into contact with a metal member.
　この発明に係る電動工具は、本体と、本体に支持されたバッテリーと、本体に支持され、本体から第１方向に延びる金属製のビットと、バッテリーから電力が供給されることにより、第１方向に沿うようにビットを振動させる駆動手段と、ビットに電気的に接続されたアース端子を有する連結手段と、ビットがアースされたことを検出する検出手段と、ビットがアースされたことを検出手段が検出すると、バッテリーから駆動手段への電力供給を遮断する遮断手段と、を備える。 The electric tool according to the present invention has a main body, a battery supported by the main body, a metal bit supported by the main body and extending in the first direction from the main body, and power is supplied from the battery in the first direction. A driving means for vibrating the bit along the line, a connecting means having a ground terminal electrically connected to the bit, a detecting means for detecting that the bit is grounded, and a detecting means for detecting that the bit is grounded. When detected by, a shutoff means for shutting off the power supply from the battery to the drive means is provided.
　この発明に係る電動工具は、本体と、アース端子付きのプラグを有し、本体から延びる電源コードと、本体に支持され、本体から第１方向に延びる金属製のビットと、プラグが接続された電源から電力が供給されることにより、第１方向に沿うようにビットを振動させる駆動手段と、ビットがアースされたことを検出する検出手段と、ビットがアースされたことを検出手段が検出すると、電源から駆動手段への電力供給を遮断する遮断手段と、を備える。 The power tool according to the present invention has a main body, a plug with a ground terminal, a power cord extending from the main body, a metal bit supported by the main body and extending in the first direction from the main body, and a plug connected to the main body. When power is supplied from the power supply, the driving means for vibrating the bit along the first direction, the detecting means for detecting that the bit is grounded, and the detecting means for detecting that the bit is grounded are detected. , A shutoff means for shutting off the power supply from the power supply to the drive means.
　この発明に係る電動工具であれば、ビットが金属部材に接触したことを検出でき、更に、作業を効率的に行うことができる。 With the power tool according to the present invention, it is possible to detect that the bit has come into contact with a metal member, and further, the work can be performed efficiently.
実施の形態１における電動工具の例を示す図である。It is a figure which shows the example of the power tool in Embodiment 1. FIG. 電動工具が有する機能を説明するための図である。It is a figure for demonstrating the function which a power tool has. エレベーターの改修工事において電動工具を使用する例を模式的に示す図である。It is a figure which shows typically the example which uses the electric tool in the repair work of an elevator. 実施の形態１における電動工具の動作例を示すフローチャートである。It is a flowchart which shows the operation example of the power tool in Embodiment 1. 実施の形態１における電動工具の他の例を示す図である。It is a figure which shows another example of the power tool in Embodiment 1. FIG.
　添付の図面を参照し、本発明を説明する。重複する説明は、適宜簡略化或いは省略する。各図において、同一の符号は同一の部分又は相当する部分を示す。 The present invention will be described with reference to the accompanying drawings. Overlapping description will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same parts or corresponding parts.
実施の形態１．
　図１は、実施の形態１における電動工具１の例を示す図である。図２は、電動工具１が有する機能を説明するための図である。電動工具１は、例えばエレベーターの改修工事において、コンクリートを削るために使用される。本実施の形態に示す例では、電動工具１は、本体２、バッテリー３、ビット４、ランプ５、及びアース線６を備える。 Embodiment 1.
FIG. 1 is a diagram showing an example of a power tool 1 according to the first embodiment. FIG. 2 is a diagram for explaining the function of the power tool 1. The power tool 1 is used for scraping concrete, for example, in an elevator repair work. In the example shown in this embodiment, the power tool 1 includes a main body 2, a battery 3, a bit 4, a lamp 5, and a ground wire 6.
　本体２は、電動工具１を使用する人が掴むためのハンドル８を備える。本体２は、ハンドル８を掴む人が操作するためのスイッチ９を備える。図１は、本体２がボタン式のスイッチ９を備える例を示す。更に、本体２は、駆動部１１、検出部１２、遮断部１３、及び点灯部１４を備える。 The main body 2 is provided with a handle 8 for the person using the power tool 1 to grasp. The main body 2 includes a switch 9 for a person who grips the handle 8 to operate the main body 2. FIG. 1 shows an example in which the main body 2 includes a button-type switch 9. Further, the main body 2 includes a drive unit 11, a detection unit 12, a blocking unit 13, and a lighting unit 14.
　バッテリー３は、本体２に支持される。バッテリー３は、本体２に着脱可能でも良い。電動工具１に必要な電力は、バッテリー３から供給される。 The battery 3 is supported by the main body 2. The battery 3 may be detachable from the main body 2. The electric power required for the power tool 1 is supplied from the battery 3.
　ビット４は、実際にコンクリートを削るための金属製の棒状部材である。例えば、ビット４は、金属製のコンクリートドリルビットである。ビット４は、本体２から特定の方向に延びるように本体２に支持される。以下においては、ビット４が本体２から延びる方向をＡ方向ともいう。ビット４は、Ａ方向に沿って変位可能となるように本体２に支持される。また、ビット４は、Ａ方向を中心に回転可能となるように本体２に支持されても良い。 Bit 4 is a metal rod-shaped member for actually shaving concrete. For example, the bit 4 is a metal concrete drill bit. The bit 4 is supported by the main body 2 so as to extend from the main body 2 in a specific direction. In the following, the direction in which the bit 4 extends from the main body 2 is also referred to as the A direction. The bit 4 is supported by the main body 2 so as to be displaceable along the A direction. Further, the bit 4 may be supported by the main body 2 so as to be rotatable around the A direction.
　ランプ５は、本体２に設けられる。ランプ５は、ハンドル８を掴む人が視認可能な位置に配置される。 The lamp 5 is provided on the main body 2. The lamp 5 is arranged at a position visible to the person holding the handle 8.
　アース線６は、アースされている部材に連結される手段の一例である。以下においては、アースされている部材のことを被アース部材ともいう。アース線６は、本体２から延びる。アース線６は、先端にアース端子６ａを有する。アース端子６ａは、ビット４に電気的に接続される。 The ground wire 6 is an example of means for being connected to a member that is grounded. In the following, the grounded member is also referred to as a grounded member. The ground wire 6 extends from the main body 2. The ground wire 6 has a ground terminal 6a at its tip. The ground terminal 6a is electrically connected to the bit 4.
　駆動部１１は、バッテリー３からの電力が供給されることにより、ビット４を駆動する。例えば、駆動部１１は、バッテリー３から電力が供給されると、Ａ方向に沿うようにビット４を振動させる。更に、駆動部１１は、バッテリー３から電力が供給されると、Ａ方向を中心にビット４を回転させる。スイッチ９に対して特定の操作が行われると、バッテリー３からの電力が駆動部１１に供給される。例えば、本体２がボタン式のスイッチ９を備えていれば、スイッチ９が押されることにより、ビット４が振動し且つ回転する。 The drive unit 11 drives the bit 4 by being supplied with electric power from the battery 3. For example, when power is supplied from the battery 3, the drive unit 11 vibrates the bit 4 along the A direction. Further, the drive unit 11 rotates the bit 4 around the A direction when power is supplied from the battery 3. When a specific operation is performed on the switch 9, the electric power from the battery 3 is supplied to the drive unit 11. For example, if the main body 2 includes a button-type switch 9, the bit 4 vibrates and rotates when the switch 9 is pressed.
　検出部１２は、ビット４がアースされたことを検出する。本体２の内部において、ビット４は、バッテリー３に電気的に接続される。アース端子６ａは、バッテリー３に電気的に接続される。スイッチ９に対して特定の操作が行われると、ビット４とアース端子６ａとの間にバッテリー３の出力電圧に応じた電位差が生じる。例えば、検出部１２は、ビット４及びアース端子６ａ間の抵抗値が基準値より小さい場合に、ビット４がアースされたことを検出する。 The detection unit 12 detects that the bit 4 has been grounded. Inside the main body 2, the bit 4 is electrically connected to the battery 3. The ground terminal 6a is electrically connected to the battery 3. When a specific operation is performed on the switch 9, a potential difference is generated between the bit 4 and the ground terminal 6a according to the output voltage of the battery 3. For example, the detection unit 12 detects that the bit 4 is grounded when the resistance value between the bit 4 and the ground terminal 6a is smaller than the reference value.
　遮断部１３は、特定の条件が成立すると、駆動部１１への電力供給を遮断する。点灯部１４は、ランプ５の点灯及び消灯を制御する。以下に、図３及び図４も参照し、電動工具１の機能について詳しく説明する。図３は、エレベーターの改修工事において電動工具１を使用する例を模式的に示す図である。図４は、実施の形態１における電動工具１の動作例を示すフローチャートである。 The cutoff unit 13 cuts off the power supply to the drive unit 11 when a specific condition is satisfied. The lighting unit 14 controls the lighting and extinguishing of the lamp 5. Hereinafter, the function of the power tool 1 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a diagram schematically showing an example in which the power tool 1 is used in the repair work of the elevator. FIG. 4 is a flowchart showing an operation example of the power tool 1 according to the first embodiment.
　例えば、エレベーターの改修工事で電動工具１を使用する場合、作業者は、電動工具１を持ってかご２１の上に移動する。作業者は、かご２１の上に移動すると、先ず、昇降路２２内の被アース部材にアース線６のアース端子６ａを連結する。 For example, when the power tool 1 is used in the repair work of the elevator, the worker moves the power tool 1 onto the car 21 with the power tool 1. When the operator moves onto the car 21, first, the ground terminal 6a of the ground wire 6 is connected to the grounded member in the hoistway 22.
　エレベーターの据付時、乗場の敷居２３は、正確に位置決めされた上で鉄筋２４に溶接固定される。図３は、補強用の筋交い２５を介して敷居２３が鉄筋２４に溶接固定される例を示す。敷居２３及び筋交い２５は金属製である。敷居２３及び筋交い２５は、昇降路２２に配置された被アース部材の一例である。 When installing the elevator, the sill 23 of the landing is accurately positioned and then welded and fixed to the reinforcing bar 24. FIG. 3 shows an example in which the sill 23 is welded and fixed to the reinforcing bar 24 via the reinforcing brace 25. The threshold 23 and the brace 25 are made of metal. The threshold 23 and the brace 25 are examples of grounded members arranged in the hoistway 22.
　作業者は、エレベーターの改修工事においてかご２１の上で電動工具１による斫り作業を行う前に、アース端子６ａを敷居２３に連結しても良い。敷居２３は、各乗場に設けられている。作業者は、作業場所から最も近い高さに配置された敷居２３にアース端子６ａを連結すれば良い。図３は、敷居２３をアース端子６ａで挟むことによってアース線６を敷居２３に連結する例を示す。図３に示す例であれば、作業者は、かご２１の上からでもアース端子６ａを被アース部材に容易に取り付けることができる。 The worker may connect the ground terminal 6a to the threshold 23 before performing the chipping work with the power tool 1 on the car 21 in the repair work of the elevator. The threshold 23 is provided at each landing. The operator may connect the ground terminal 6a to the threshold 23 arranged at the height closest to the work place. FIG. 3 shows an example in which the ground wire 6 is connected to the sill 23 by sandwiching the sill 23 with the ground terminal 6a. In the example shown in FIG. 3, the operator can easily attach the ground terminal 6a to the grounded member even from above the car 21.
　なお、エレベーターの改修工事では、敷居２３を交換することがある。敷居２３が撤去されていても、敷居２３が固定されていた鉄筋２４或いは筋交い２５は昇降路２２に残されている。敷居２３が既に撤去されている場合、作業者は、電動工具１による斫り作業を行う前に、アース端子６ａを鉄筋２４或いは筋交い２５に連結しても良い。 In the elevator repair work, the threshold 23 may be replaced. Even if the threshold 23 is removed, the reinforcing bars 24 or braces 25 to which the threshold 23 is fixed are left in the hoistway 22. If the sill 23 has already been removed, the operator may connect the ground terminal 6a to the reinforcing bar 24 or the brace 25 before performing the chipping work with the power tool 1.
　電動工具１では、スイッチ９が押されたか否かが判定される（Ｓ１０１）。作業者は、アース端子６ａを敷居２３に連結すると、コンクリートの壁にビット４を当て、ハンドル８を握った手でスイッチ９を押す。これにより、Ｓ１０１でＹｅｓと判定される。Ｓ１０１でＹｅｓと判定されると、バッテリー３から駆動部１１に電力が供給される。これにより、駆動部１１はビット４を駆動する（Ｓ１０２）。本実施の形態に示す例であれば、Ｓ１０２においてビット４は、Ａ方向に沿うように振動し且つＡ方向を中心に回転する。 In the power tool 1, it is determined whether or not the switch 9 is pressed (S101). When the ground terminal 6a is connected to the threshold 23, the operator puts the bit 4 on the concrete wall and pushes the switch 9 with the hand holding the handle 8. As a result, S101 determines Yes. If it is determined to be Yes in S101, power is supplied from the battery 3 to the drive unit 11. As a result, the drive unit 11 drives the bit 4 (S102). In the example shown in this embodiment, in S102, the bit 4 vibrates along the A direction and rotates about the A direction.
　電動工具１では、Ｓ１０１でＹｅｓと判定されると、ビット４がアースされたか否かが検出部１２によって判定される（Ｓ１０３）。図３は、コンクリートの内部に、電線を保護するための金属管２６が埋められている例を示す。金属管２６は、アースされている。また、上述したように、アース端子６ａは被アース部材に連結されている。このため、斫り作業中にビット４が金属管２６に接触すると、ビット４がアースされたことが検出部１２によって検出される（Ｓ１０３のＹｅｓ）。 In the power tool 1, if it is determined to be Yes in S101, the detection unit 12 determines whether or not the bit 4 is grounded (S103). FIG. 3 shows an example in which a metal pipe 26 for protecting an electric wire is buried inside concrete. The metal tube 26 is grounded. Further, as described above, the ground terminal 6a is connected to the grounded member. Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the detection unit 12 detects that the bit 4 is grounded (Yes in S103).
　ビット４がアースされたことが検出部１２によって検出されると、遮断部１３は、バッテリー３から駆動部１１への電力供給を遮断する（Ｓ１０４）。このため、斫り作業中にビット４が金属管２６に接触すると、ビット４の振動及び回転が即座に停止される。これにより、金属管２６が破損したりビット４が破損したりすることを防止できる。 When the detection unit 12 detects that the bit 4 is grounded, the cutoff unit 13 cuts off the power supply from the battery 3 to the drive unit 11 (S104). Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the vibration and rotation of the bit 4 are immediately stopped. This makes it possible to prevent the metal tube 26 from being damaged and the bit 4 from being damaged.
　また、ビット４がアースされたことが検出部１２によって検出されると、点灯部１４は、ランプ５を点灯させる（Ｓ１０５）。作業者は、点灯したランプ５を見ることにより、金属管２６等の金属部材にビット４が接触したことを知ることができる。なお、ランプ５は、本体２に設けられた報知器の一例である。点灯部１４は、報知器を制御する報知部の一例である。点灯部１４がランプ５を点灯させることは、報知部が報知器を動作させることの一例である。例えば、本体２に、報知器としてブザーが設けられても良い。かかる場合、報知部は、Ｓ１０５においてブザーを鳴動させる。他の例として、本体２に、報知器としてランプ５とブザーとの双方が設けられても良い。かかる場合、報知部は、Ｓ１０５においてランプ５を点灯させ且つブザーを鳴動させる。 Further, when the detection unit 12 detects that the bit 4 is grounded, the lighting unit 14 lights the lamp 5 (S105). By looking at the lit lamp 5, the operator can know that the bit 4 has come into contact with a metal member such as the metal tube 26. The lamp 5 is an example of a notification device provided in the main body 2. The lighting unit 14 is an example of a notification unit that controls the notification device. The lighting unit 14 lighting the lamp 5 is an example of the notification unit operating the alarm. For example, the main body 2 may be provided with a buzzer as a notification device. In such a case, the notification unit sounds the buzzer in S105. As another example, the main body 2 may be provided with both a lamp 5 and a buzzer as an alarm. In such a case, the notification unit turns on the lamp 5 and sounds the buzzer in S105.
　本実施の形態に示す例であれば、斫り作業中に金属管２６等の金属部材にビット４が接触したことを電動工具１において検出することができる。このため、作業者は、かご２１の上で斫り作業を行う際に、従来のようにメタルセンサ付きのコードリールをかご２１の上に搬入する必要がない。作業者は、コードリールをかご２１の上に置いたまま斫り作業を行う必要はなく、作業を効率的に行うことができる。 In the example shown in the present embodiment, the power tool 1 can detect that the bit 4 comes into contact with a metal member such as a metal tube 26 during the chipping operation. Therefore, the operator does not need to carry the cord reel with the metal sensor onto the car 21 when performing the chipping work on the car 21. The operator does not need to perform the chipping work with the cord reel placed on the car 21, and the work can be performed efficiently.
　以下に、電動工具１が採用可能な他の機能について説明する。電動工具１は、以下に示す複数の機能を組み合わせて採用しても良い。 The other functions that can be adopted by the power tool 1 will be described below. The power tool 1 may be adopted by combining a plurality of functions shown below.
　上記説明では、バッテリー３からの直流に基づいて種々の機能が実現される例を示した。他の例として、電動工具１の本体２は、図２に示すように変換部１５を更に備えても良い。変換部１５は、バッテリー３からの直流を交流に変換する。かかる場合、駆動部１１に対しては、変換部１５からの交流が供給される。また、ビット４は、変換部１５に電気的に接続される。アース端子６ａは、変換部１５に電気的に接続される。スイッチ９に対して特定の操作が行われると、ビット４とアース端子６ａとの間には変換部１５の出力電圧に応じた電位差が生じる。 In the above explanation, an example in which various functions are realized based on the direct current from the battery 3 is shown. As another example, the main body 2 of the power tool 1 may further include a conversion unit 15 as shown in FIG. The conversion unit 15 converts the direct current from the battery 3 into alternating current. In such a case, the alternating current from the conversion unit 15 is supplied to the drive unit 11. Further, the bit 4 is electrically connected to the conversion unit 15. The ground terminal 6a is electrically connected to the conversion unit 15. When a specific operation is performed on the switch 9, a potential difference is generated between the bit 4 and the ground terminal 6a according to the output voltage of the conversion unit 15.
　他の例として、電動工具１はバッテリー３を備えていなくても良い。図５は、実施の形態１における電動工具１の他の例を示す図である。図５に示す例では、電動工具１は、本体２、ビット４、ランプ５、及び電源コード７を備える。電源コード７は、本体２から延びる。電源コード７は、アース端子付きのプラグ７ａを有する。プラグ７ａのアース端子は、ビット４に電気的に接続される。本体２は、ハンドル８及びスイッチ９を備える。更に、本体２は、駆動部１１、検出部１２、遮断部１３、及び点灯部１４を備える。 As another example, the power tool 1 does not have to be equipped with the battery 3. FIG. 5 is a diagram showing another example of the power tool 1 according to the first embodiment. In the example shown in FIG. 5, the power tool 1 includes a main body 2, a bit 4, a lamp 5, and a power cord 7. The power cord 7 extends from the main body 2. The power cord 7 has a plug 7a with a ground terminal. The ground terminal of the plug 7a is electrically connected to the bit 4. The main body 2 includes a handle 8 and a switch 9. Further, the main body 2 includes a drive unit 11, a detection unit 12, a blocking unit 13, and a lighting unit 14.
　かご２１の上には、エレベーターの保守を行う保守員のために、アース付きのコンセント２７が設けられることが多い。作業者は、エレベーターの改修工事においてかご２１の上で図５に示す電動工具１を用いる場合は、斫り作業を開始する前にプラグ７ａをコンセント２７に接続しても良い。電動工具１に必要な電力は、コンセント２７に接続されたプラグ７ａを介して商用電源から供給される。プラグ７ａをコンセント２７に接続することにより、上述したバッテリー３の機能とアース線６の機能とを同時に実現することができる。 A grounded outlet 27 is often provided on the car 21 for maintenance personnel who maintain the elevator. When the power tool 1 shown in FIG. 5 is used on the car 21 in the repair work of the elevator, the operator may connect the plug 7a to the outlet 27 before starting the chipping work. The electric power required for the power tool 1 is supplied from a commercial power source via a plug 7a connected to the outlet 27. By connecting the plug 7a to the outlet 27, the above-mentioned function of the battery 3 and the function of the ground wire 6 can be realized at the same time.
　駆動部１１は、プラグ７ａが接続された商用電源から電力が供給されることにより、ビット４を駆動する。例えば、駆動部１１は、商用電源から電力が供給されると、Ａ方向に沿うようにビット４を振動させ且つＡ方向を中心にビット４を回転させる。商用電源からの電力は、スイッチ９に対して特定の操作が行われることにより、駆動部１１に供給される。 The drive unit 11 drives the bit 4 by supplying electric power from a commercial power source to which the plug 7a is connected. For example, when power is supplied from the commercial power source, the drive unit 11 vibrates the bit 4 along the A direction and rotates the bit 4 around the A direction. The electric power from the commercial power source is supplied to the drive unit 11 by performing a specific operation on the switch 9.
　検出部１２は、例えばビット４及びプラグ７ａのアース端子間の抵抗値が基準値より小さい場合に、ビット４がアースされたことを検出する。このため、斫り作業中にビット４が金属管２６に接触すると、ビット４がアースされたことが検出部１２によって検出される。ビット４がアースされたことが検出部１２によって検出されると、遮断部１３は、プラグ７ａが接続された商用電源から駆動部１１への電力供給を遮断する。このため、斫り作業中にビット４が金属管２６に接触すると、ビット４の振動及び回転が即座に停止される。これにより、金属管２６が破損したりビット４が破損したりすることを防止できる。 The detection unit 12 detects that the bit 4 is grounded, for example, when the resistance value between the ground terminal of the bit 4 and the plug 7a is smaller than the reference value. Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the detection unit 12 detects that the bit 4 is grounded. When the detection unit 12 detects that the bit 4 is grounded, the cutoff unit 13 cuts off the power supply from the commercial power supply to which the plug 7a is connected to the drive unit 11. Therefore, when the bit 4 comes into contact with the metal tube 26 during the chipping operation, the vibration and rotation of the bit 4 are immediately stopped. This makes it possible to prevent the metal tube 26 from being damaged and the bit 4 from being damaged.
　また、ビット４がアースされたことが検出部１２によって検出されると、点灯部１４は、ランプ５を点灯させる。この時、本体２に設けられたブザーが鳴動しても良い。作業者は、点灯したランプ５を見ることにより、金属管２６等の金属部材にビット４が接触したことを知ることができる。 Further, when the detection unit 12 detects that the bit 4 is grounded, the lighting unit 14 lights the lamp 5. At this time, the buzzer provided on the main body 2 may sound. By looking at the lit lamp 5, the operator can know that the bit 4 has come into contact with a metal member such as the metal tube 26.
　なお、エレベーターの改修工事では、コンセント２７がかご２１の上から撤去されることがある。このような場合に備えて、電動工具１はバッテリー３及びアース線６を備えていることが好ましい。電動工具１は、電源コード７とバッテリー３及びアース線６との双方を備えていても良い。 In the elevator repair work, the outlet 27 may be removed from the top of the car 21. In preparation for such a case, the power tool 1 preferably includes a battery 3 and a ground wire 6. The power tool 1 may include both a power cord 7, a battery 3, and a ground wire 6.
　本実施の形態において、符号１１～１５に示す各部は、電動工具１の本体２が有する機能を示す。本体２が有する機能は、例えば専用ハードウェアによって実現される。本体２が有する機能の一部は、ソフトウェアによって実現されても良い。かかる場合、本体２は、ハードウェア資源として、プロセッサとメモリとを含む処理回路を備える。本体２は、メモリに記憶されたプログラムをプロセッサによって実行することにより、機能の上記一部を実現する。 In the present embodiment, each part indicated by reference numerals 11 to 15 indicates a function possessed by the main body 2 of the power tool 1. The function of the main body 2 is realized by, for example, dedicated hardware. Some of the functions of the main body 2 may be realized by software. In such a case, the main body 2 includes a processing circuit including a processor and a memory as hardware resources. The main body 2 realizes the above-mentioned part of the function by executing the program stored in the memory by the processor.
　この発明は、ビットが駆動している時にビットが意図せずに金属部材に接触し得る電動工具に適用できる。 The present invention can be applied to a power tool in which a bit can unintentionally come into contact with a metal member while the bit is being driven.
　１　電動工具、　２　本体、　３　バッテリー、　４　ビット、　５　ランプ、　６　アース線、　６ａ　アース端子、　７　電源コード、　７ａ　プラグ、　８　ハンドル、　９　スイッチ、　１１　駆動部、　１２　検出部、　１３　遮断部、　１４　点灯部、　１５　変換部、　２１　かご、　２２　昇降路、　２３　敷居、　２４　鉄筋、　２５　筋交い、　２６　金属管、　２７　コンセント 1 power tool, 2 main body, 3 battery, 4 bits, 5 lamp, 6 ground wire, 6a ground terminal, 7 power cord, 7a plug, 8 handle, 9 switch, 11 drive unit, 12 detector, 13 cutoff unit, 14 Lighting part, 15 conversion part, 21 basket, 22 hoistway, 23 threshold, 24 rebar, 25 brace, 26 metal pipe, 27 outlet

Claims (5)

  1. 　本体と、
    　前記本体に支持されたバッテリーと、
    　前記本体に支持され、前記本体から第１方向に延びる金属製のビットと、
    　前記バッテリーから電力が供給されることにより、前記第１方向に沿うように前記ビットを振動させる駆動手段と、
    　前記ビットに電気的に接続されたアース端子を有する連結手段と、
    　前記ビットがアースされたことを検出する検出手段と、
    　前記ビットがアースされたことを前記検出手段が検出すると、前記バッテリーから前記駆動手段への電力供給を遮断する遮断手段と、
    を備えた電動工具。     With the main body
    The battery supported by the main body and
    A metal bit supported by the main body and extending in the first direction from the main body,
    A driving means that vibrates the bit along the first direction by being supplied with electric power from the battery.
    A connecting means having a ground terminal electrically connected to the bit,
    A detection means for detecting that the bit has been grounded, and
    When the detecting means detects that the bit is grounded, the cutting means for cutting off the power supply from the battery to the driving means, and
    Power tool with.
  2. 　前記バッテリーからの直流を交流に変換する変換手段を更に備え、
    　前記ビットは、前記変換手段に電気的に接続され、
    　前記アース端子は、前記変換手段に電気的に接続された請求項１に記載の電動工具。     Further provided with a conversion means for converting direct current from the battery into alternating current,
    The bit is electrically connected to the conversion means and
    The power tool according to claim 1, wherein the ground terminal is electrically connected to the conversion means.
  3. 　本体と、
    　アース端子付きのプラグを有し、前記本体から延びる電源コードと、
    　前記本体に支持され、前記本体から第１方向に延びる金属製のビットと、
    　前記プラグが接続された電源から電力が供給されることにより、前記第１方向に沿うように前記ビットを振動させる駆動手段と、
    　前記ビットがアースされたことを検出する検出手段と、
    　前記ビットがアースされたことを前記検出手段が検出すると、前記電源から前記駆動手段への電力供給を遮断する遮断手段と、
    を備えた電動工具。     With the main body
    A power cord that has a plug with a ground terminal and extends from the main body,
    A metal bit supported by the main body and extending in the first direction from the main body,
    A driving means that vibrates the bit along the first direction by supplying electric power from a power source to which the plug is connected.
    A detection means for detecting that the bit has been grounded, and
    When the detecting means detects that the bit is grounded, the cutting means for cutting off the power supply from the power source to the driving means, and
    Power tool with.
  4. 　前記本体に設けられた報知器と、
    　前記ビットがアースされたことを前記検出手段が検出すると、前記報知器を動作させる報知手段と、
    を更に備えた請求項１から請求項３の何れか一項に記載の電動工具。     The alarm provided in the main body and
    When the detection means detects that the bit has been grounded, the notification means for operating the notification means and
    The power tool according to any one of claims 1 to 3, further comprising.
  5. 　前記駆動手段は、電力が供給されることにより、前記第１方向に沿うように前記ビットを振動させ且つ前記第１方向を中心に前記ビットを回転させる請求項１から請求項４の何れか一項に記載の電動工具。 Any one of claims 1 to 4, wherein the drive means vibrates the bit along the first direction and rotates the bit around the first direction when electric power is supplied. Power tools described in the section.
PCT/JP2020/000471 2020-01-09 2020-01-09 Electric tool WO2021140617A1 (en)

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US12017288B2 (en) * 2019-09-26 2024-06-25 Huskie Tools, Llc Remotely controlled cutting tool and method

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