JPH09314481A - Electric tool - Google Patents
Electric toolInfo
- Publication number
- JPH09314481A JPH09314481A JP8157644A JP15764496A JPH09314481A JP H09314481 A JPH09314481 A JP H09314481A JP 8157644 A JP8157644 A JP 8157644A JP 15764496 A JP15764496 A JP 15764496A JP H09314481 A JPH09314481 A JP H09314481A
- Authority
- JP
- Japan
- Prior art keywords
- outer shell
- resin
- insulator
- power tool
- switch handle
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Portable Power Tools In General (AREA)
Abstract
(57)【要約】
【目的】外殻の強度があり、スイッチハンドルの内部に
付加絶縁物を容易に装着でき、かつ、この箇所の絶縁を
十分に行うことができる二重絶縁構造の電動工具を提供
することを目的とする。
【構成】外殻がアルミ製部品で構成され、この外殻とこ
の外殻の内部に配設されたリード線８及びスイッチ９端
子部との間に真空成形により形成された樹脂製絶縁体６
を配置し、前記外殻と、この外殻の内部に配設された固
定子７との間に略円筒形に成形された樹脂製絶縁体５を
配置し、アーマチュア１１の軸の外周を樹脂製絶縁材で
覆う構造にすることにより、外殻の強度があり、組立作
業性が容易で、かつ、十分な絶縁性のある電動工具にす
ることができる。
(57) [Abstract] [Purpose] A power tool with a double insulation structure that has a strong outer shell, allows easy attachment of an additional insulator inside the switch handle, and can sufficiently insulate this part. The purpose is to provide. [Structure] An outer shell is made of an aluminum component, and a resin insulator 6 formed by vacuum molding between the outer shell and a lead wire 8 and a switch 9 terminal portion disposed inside the outer shell.
And a resin insulator 5 formed in a substantially cylindrical shape is arranged between the outer shell and a stator 7 arranged inside the outer shell, and the outer circumference of the shaft of the armature 11 is made of resin. By providing a structure covered with an insulating material, it is possible to provide a power tool having a strong outer shell, easy assembling workability, and sufficient insulation.
Description
【０００１】[0001]
【産業上の利用分野】本発明は電動工具の二重絶縁構造
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double insulation structure for a power tool.
【０００２】[0002]
【従来の技術】電動工具の外殻であるフレームは固定
子、回転子及びブラシ部などを収納しているモータ部と
スイッチやリード線などを収納しているスイッチハンド
ル部とで構成されている。2. Description of the Related Art A frame, which is an outer shell of an electric power tool, is composed of a motor section for accommodating a stator, a rotor, a brush section and the like and a switch handle section for accommodating switches and lead wires. .
【０００３】図５は従来の二重絶縁構造の電動工具１０
の外殻の構成の一例である。樹脂製絶縁材で一体に成形
された外殻であるフレーム２ａはモータ部３とスイッチ
ハンドル部４とからなり、モータ部３は略円筒形をして
おり、スイッチハンドル部４は半割りの構造になってい
る。FIG. 5 shows a conventional power tool 10 having a double insulation structure.
It is an example of the structure of the outer shell of. A frame 2a, which is an outer shell integrally formed of a resin insulating material, includes a motor portion 3 and a switch handle portion 4, the motor portion 3 has a substantially cylindrical shape, and the switch handle portion 4 has a half-divided structure. It has become.
【０００４】そして、このスイッチハンドル部４の開口
部には、半割り構造のスイッチハンドルカバ ーが締着
されている。また、回転子１１の一構成品である軸（シ
ャフト）の外周も電気絶縁性のある樹脂で覆われた絶縁
シャフト１２を使用している。A switch handle cover having a half-split structure is fastened to the opening of the switch handle portion 4. Further, an insulating shaft 12 whose outer periphery is a shaft which is one component of the rotor 11 is also covered with an electrically insulating resin is used.
【０００５】このような構成にすることにより、充電部
と外殻とは二重絶縁された構造の電動工具１０になって
いる。With this structure, the power tool 10 has a structure in which the charging part and the outer shell are double insulated.
【０００６】しかしながら、フレームなどの外殻が樹脂
製絶縁材で構成された従来の二重絶縁構造の電動工具
は、外殻がダイカストなどのアルミ材でできているシン
グル絶縁構造の電動工具に較べ、強度及び耐久性の点で
劣るという問題があった。However, the conventional double-insulated electric tool in which the outer shell of the frame or the like is made of a resin insulating material is compared with the single-insulated electric tool in which the outer shell is made of an aluminum material such as die casting. However, there is a problem in that it is inferior in strength and durability.
【０００７】そこで考えられるのが、外殻の強度と耐久
性を上げるために、この外殻をダイカストなどのアルミ
製にして、この外殻と充電部との間に絶縁体を装着した
構成のものが考えられる。これらの絶縁体として、固定
子と外殻との間には絶縁性樹脂で成形された略円筒形の
絶縁体を装着し、スイッチハンドル部のリード線及びス
イッチ端子部と外殻との間には、あるサイズに切断され
た絶縁紙をリード線及びスイッチ端子部に略円筒状に巻
きつけて絶縁することが考えられる。Therefore, in order to increase the strength and durability of the outer shell, the outer shell may be made of aluminum such as die casting, and an insulator is attached between the outer shell and the charging section. Things can be considered. As these insulators, a substantially cylindrical insulator molded with an insulating resin is attached between the stator and the outer shell, and the lead wire of the switch handle portion and the switch terminal portion and the outer shell are provided. It is conceivable that the insulating paper cut into a certain size is wound around the lead wire and the switch terminal portion in a substantially cylindrical shape for insulation.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、アルミ
製の外殻（スイッチハンドルやフレーム等）を用いて二
重絶縁構造とする場合、この外殻の内部に付加絶縁物を
装着しなければならないが、特に、スイッチハンドル部
の内部はスペースが狭く、また、この箇所にはネジ孔や
ボス等が配置され形状が複雑であり、リード線やスイッ
チ端子部を絶縁紙で絶縁する作業は大変である。また、
絶縁紙に隙間ができたりして絶縁が不完全になるなどの
問題がある。However, when an aluminum outer shell (switch handle, frame, etc.) is used to form a double insulation structure, an additional insulator must be mounted inside the outer shell. In particular, the space inside the switch handle part is narrow, and screw holes, bosses, etc. are arranged in this part, and the shape is complicated, so it is difficult to insulate the lead wire and switch terminal part with insulating paper. . Also,
There is a problem that insulation is incomplete due to gaps in the insulating paper.
【０００９】本発明は、この様な事情を鑑みてなされた
ものであり、外殻の強度があり、各種電動工具のスイッ
チハンドルの内部に付加絶縁物を容易に装着でき、か
つ、十分な絶縁ができる二重絶縁構造の電動工具を提供
することを課題としている。The present invention has been made in view of the above circumstances and has a strong outer shell, so that an additional insulator can be easily attached to the inside of the switch handle of various electric tools, and sufficient insulation can be obtained. An object of the present invention is to provide a power tool having a double insulation structure capable of achieving the above.
【００１０】[0010]
（請求項１）電動工具の外殻の一部であるスイッチハン
ドルがアルミ製部品で構成され、このスイッチハンドル
と、このスイッチハンドルの内部に配設されたリード線
及びスイッチ端子部との間に、真空成形により形成され
た樹脂製絶縁物を装着し、付加絶縁することにより、外
殻の強度があり、組立作業性が容易で、かつ、十分な絶
縁をおこなうことができ課題を解決している。(Claim 1) A switch handle, which is a part of the outer shell of the electric power tool, is made of an aluminum part, and between the switch handle and the lead wire and the switch terminal portion arranged inside the switch handle. By mounting a resin insulator formed by vacuum molding and performing additional insulation, the strength of the outer shell is provided, assembly workability is easy, and sufficient insulation can be achieved to solve the problem. There is.
【００１１】（請求項２）電動工具の外殻がアルミ製部
品で構成され、この外殻とこの外殻の内部に配設された
リード線及びスイッチ端子部との間に真空成形により形
成された樹脂製絶縁体を装着し、前記外殻と、この外殻
の内部に配設された固定子との間に略円筒形に成形され
た樹脂製絶縁体を装着し、アーマチュアの軸の外周を樹
脂製絶縁材で覆うことにより、外殻の強度があり、組立
作業性が容易で、かつ、十分な絶縁性があり課題を解決
している。(Claim 2) The outer shell of the power tool is made of aluminum parts, and is formed by vacuum molding between the outer shell and the lead wire and the switch terminal portion arranged inside the outer shell. And a resin insulator formed in a substantially cylindrical shape between the outer shell and a stator disposed inside the outer shell, and the outer circumference of the armature shaft. By covering the resin with an insulating material, the strength of the outer shell is provided, the assembling workability is easy, and the sufficient insulating property is provided to solve the problem.
【００１２】[0012]
【作用】外殻がアルミ製でできたフレームと固定子との
間に樹脂製絶縁材で略円筒形に成形された絶縁体を挿入
し、そして、スイッチハンドル部と、この中に内装され
たリード線及びスイッチの端子部との間に真空成形によ
り形成された樹脂製絶縁体を装着し、さらに、回転子の
一構成品であるシャフトの外周が樹脂製絶縁材で覆われ
た絶縁シャフトを使用することにより二重絶縁構造の電
動工具になる。[Function] An insulator formed into a substantially cylindrical shape with a resin insulating material is inserted between a frame whose outer shell is made of aluminum and a stator, and a switch handle portion and an inside thereof are incorporated. A resin insulator formed by vacuum molding is attached between the lead wire and the switch terminal, and an insulating shaft with the outer periphery of the shaft, which is a component of the rotor, is covered with resin insulating material. By using it, it becomes a power tool with double insulation structure.
【００１３】この様な構成にすることにより、シングル
絶縁部の絶縁が劣化や衝撃などで破壊された場合でも、
外殻と充電部とが付加されて絶縁体（付加絶縁体）によ
り絶縁されているので感電が防止される。With such a structure, even if the insulation of the single insulating portion is broken due to deterioration or impact,
Since the outer shell and the charging part are added and insulated by the insulator (additional insulator), electric shock is prevented.
【００１４】[0014]
【実施例】本発明を図面に示された一実施例に基づいて
説明すると、図１は本発明の一実施例による二重絶縁構
造の電動工具の要部の断面図であり、図２は図１の固定
子部の縦断面図であり、図３は図１のスイッチハンドル
部の縦断面図であり、図４は真空成形型の縦断面図であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a sectional view of a main part of a power tool having a double insulation structure according to an embodiment of the present invention, and FIG. It is a longitudinal cross-sectional view of the stator part of FIG. 1, FIG. 3 is a vertical cross-sectional view of the switch handle part of FIG. 1, and FIG. 4 is a vertical cross-sectional view of a vacuum forming die.
【００１５】図１〜図３において、電動工具１の外殻で
あるフレーム２の材質はアルミ材を使用している。この
フレーム２のスイッチハンドル部４の断面形状は略Ｕ字
形に形成されている。そして、このフレーム２のスイッ
チハンドル部４の内部には、断面形状が略Ｕ字形に真空
成形された樹脂製の絶縁体Ｂ６が装着されている。この
スイッチハンドル部４のＢ−Ｂ部の断面形状は図３に示
す。1 to 3, the frame 2 which is the outer shell of the electric tool 1 is made of aluminum. The switch handle portion 4 of the frame 2 has a substantially U-shaped cross-section. Then, inside the switch handle portion 4 of the frame 2, a resin insulator B6 vacuum-formed into a substantially U-shaped cross section is mounted. The sectional shape of the BB portion of the switch handle portion 4 is shown in FIG.
【００１６】また、このフレーム２の固定子７を装着す
る箇所は略円筒形に形成されており、この略円筒形をし
たフレーム２の内径部には、絶縁性のある樹脂で略円筒
形に形成された絶縁体Ａ５が装着されている。さらに、
この絶縁体Ａ５の内径部には固定子７が嵌入されてい
る。このモータ部３のＡ−Ａ部の断面形状は図２に示
す。また、回転子１１の一構成品である軸（シャフト）
は外周が樹脂製絶縁材で覆われた絶縁シャフト１２を使
用している。Further, the portion of the frame 2 where the stator 7 is mounted is formed in a substantially cylindrical shape, and the inner diameter portion of the substantially cylindrical frame 2 is made of an insulating resin into a substantially cylindrical shape. The formed insulator A5 is attached. further,
The stator 7 is fitted in the inner diameter portion of the insulator A5. The cross-sectional shape of the AA portion of the motor unit 3 is shown in FIG. In addition, a shaft that is one component of the rotor 11
Uses an insulating shaft 12 whose outer periphery is covered with a resin insulating material.
【００１７】この様な構成において、フレーム２のスイ
ッチハンドル部４と、この中に内装されたリード線８及
びスイッチ９の端子部との間に真空成形された絶縁体Ｂ
６が装着され、そして、真空成形された絶縁体が装着さ
れたハンドルカバーをこのスイッチハンドル部の開口部
に締着することにより、充電部であるリード線８及びス
イッチ９の端子部と外殻であるスイッチハンドル部４と
が電気的に絶縁され、かつ、リード線８が絶縁材で被覆
されているのでこの箇所も二重絶縁構造になっている。In such a structure, the insulator B vacuum-formed between the switch handle portion 4 of the frame 2 and the lead wire 8 and the terminal portion of the switch 9 housed therein.
6 is attached, and the handle cover to which the vacuum-formed insulator is attached is fastened to the opening portion of the switch handle portion, so that the lead wire 8 which is the charging portion and the terminal portion of the switch 9 and the outer shell. Since it is electrically insulated from the switch handle portion 4 and the lead wire 8 is covered with an insulating material, this portion also has a double insulating structure.
【００１８】そして、アルミ製のフレーム２と固定子７
との間に絶縁体Ａが挿入されていることにより、充電部
である固定子７が外殻であるフレーム２と電気的に絶縁
され、かつ、固定子鉄心と巻線との間が絶縁紙で絶縁さ
れているので、この箇所は二重絶縁構造を構成してい
る。Then, the aluminum frame 2 and the stator 7
Since the insulator A is inserted between the stator 7 as a charging part and the frame 2 as an outer shell, the insulator 7 is electrically insulated, and the insulating paper is provided between the stator core and the winding. Since it is insulated by, this part constitutes a double insulation structure.
【００１９】さらに、回転子１１の一構成品である軸
（シャフト）の外周が樹脂製絶縁材で覆われた絶縁シャ
フト１２を使用しているので、回転子１１の充電部とこ
のシャフト１２と噛合しているギア部及び外殻が電気的
に絶縁され、さらに、この回転子鉄心と巻線とが絶縁紙
で絶縁されているのでこの箇所も二重絶縁構造になって
いる。Further, since the insulating shaft 12 whose outer periphery is covered with a resin insulating material is used as one component of the rotor 11, the charging portion of the rotor 11 and this shaft 12 are The meshed gear portion and outer shell are electrically insulated, and the rotor core and the winding are insulated with insulating paper, so that this portion also has a double insulation structure.
【００２０】この様に各充電部とフレーム２及び軸との
間に絶縁体を入れることにより、外殻であるフレーム２
にアルミ材などの導電体を使用しても、このフレーム２
の内側で充電部と付加絶縁され二重絶縁の構造になって
いるので、フレーム２が樹脂で形成された電動工具１０
と同様に感電の恐れがなく安全で、かつ、シングル絶縁
された電動工具と同等の強度と耐久性が得られる。In this way, by inserting an insulator between each charging part and the frame 2 and the shaft, the frame 2 which is the outer shell.
Even if a conductor such as aluminum is used for the frame 2,
The electric power tool 10 in which the frame 2 is made of resin has a double insulation structure in which the frame is additionally insulated from the live part inside.
As with, there is no danger of electric shock, safety, and the same strength and durability as a single insulated power tool can be obtained.
【００２１】なお、真空成形について図４に基づいて簡
単に説明しますと、この成形は樹脂（プラスチック）成
形加工の一種であり、樹脂（プラスチック）板１４の周
縁をクランプ１７でめす型１５に固定し、ヒーター１６
等で加熱して十分軟化させた後に真空ポンプ１８で型内
の空気を吸引することにより板は延ばされ成形型に密着
して成形される。The vacuum forming will be briefly described with reference to FIG. 4. This forming is a kind of resin (plastic) forming process, and the periphery of the resin (plastic) plate 14 is clamped by a clamp 17 into a mold 15. Fixed and heater 16
The plate is stretched by sucking the air in the mold by the vacuum pump 18 after heating it sufficiently to soften it, and the plate is formed in close contact with the mold.
【００２２】この成型方法では、肉厚の薄いものを安価
に作ることができるという効果（利点）があり、少量か
ら多量生産まで幅広い生産に対応でき、型製作の費用も
少なくて済み経済的な製造方法である。This molding method has an effect (advantage) that a thin-walled product can be manufactured at a low cost, can be used for a wide range of production from a small amount to a large-scale production, and the cost of die manufacturing is low, which is economical. It is a manufacturing method.
【００２３】外殻形状の他の例として例えば、フレーム
をシャフトの軸に平行に二分割した形状の外殻を締着し
た構造のものも考えられる。この場合の固定子１１に嵌
合する絶縁体の形状は略円筒形ではなく、略円筒形を二
分割した形状に形成したものを使用することは申すまで
もない。As another example of the outer shell shape, for example, a structure in which an outer shell having a shape in which a frame is divided into two parallel to the axis of the shaft is fastened is conceivable. It goes without saying that the shape of the insulator fitted into the stator 11 in this case is not a substantially cylindrical shape, but a shape obtained by dividing a substantially cylindrical shape into two is used.
【００２４】なお、電動工具にはドリル、グラインダー
など種々の用途の工具があり、これらの工具の機能やデ
ザインに応じて、フレームの形状が異なってくる。しか
し、本発明は外殻をアルミフレームにしてフレームの強
度を保持し、そして、このフレームと充電部との間に絶
縁体を介在させることにより、二重絶縁構造にするのが
この発明の特徴であり、フレーム（外殻）及び絶縁体の
形状は、実施例の形状にはこだわらない。There are various types of power tools such as drills and grinders, and the shape of the frame varies depending on the function and design of these tools. However, according to the present invention, the outer shell is made of an aluminum frame to maintain the strength of the frame, and an insulator is interposed between the frame and the charging section to form a double insulating structure. Therefore, the shapes of the frame (outer shell) and the insulator are not limited to the shapes of the embodiments.
【００２５】[0025]
【発明の効果】以上の通り、本願発明の電動工具はアル
ミフレームの内側と充電部との間に樹脂製絶縁材で形成
された絶縁体を配設することによりシングル絶縁品の電
動工具と同等の強度と耐久性が得られ、かつ、安価で、
組立作業性が容易であり、さらに、十分な絶縁をおこな
うことができる。As described above, the power tool of the present invention is equivalent to a single-insulation power tool by disposing an insulator made of resin insulating material between the inside of the aluminum frame and the charging part. The strength and durability of
Assembly workability is easy, and sufficient insulation can be performed.
【００２６】[0026]
【図１】本発明の一実施例による二重絶縁構造の電動工
具の要部の断面図である。FIG. 1 is a sectional view of an essential part of a power tool having a double insulation structure according to an embodiment of the present invention.
【図２】図１の固定子部の縦断面図でる。FIG. 2 is a vertical sectional view of a stator portion of FIG.
【図３】図１のスイッチハンドル部の縦断面図である。3 is a vertical cross-sectional view of the switch handle portion of FIG.
【図４】真空成形型の縦断面図である。FIG. 4 is a vertical sectional view of a vacuum forming die.
【図５】従来の二重絶縁構造の電動工具の断面図であ
る。FIG. 5 is a cross-sectional view of a conventional power tool having a double insulation structure.
１、１０・・電動工具 ２、２ａ・・フレーム ３・・・・・モータ部 ４・・・・・スイッチハンドル部 ５・・・・・絶縁体Ａ ６・・・・・絶縁体Ｂ ７・・・・・固定子 ８・・・・・リード線 ９・・・・・スイッチ １１・・・・・回転子（アーマチュア） １２・・・・・絶縁シャフト 1, 10 ... Electric power tool 2, 2a ... Frame 3 ... Motor section 4 ... Switch handle section 5 ... Insulator A 6 ... Insulator B 7 ... .... Stator 8 ... Lead wire 9 ... Switch 11 ... Rotor (armature) 12 ... Insulated shaft
Claims (2)
ミ製部品で構成された電動工具において、 このスイッチハンドルと、このスイッチハンドルの内部
に配設されたリード線及びスイッチ端子部との間に、真
空成形により形成された樹脂製絶縁体を装着し、付加絶
縁したことを特徴とする二重絶縁構造の電動工具。1. A power tool in which a switch handle, which is a part of an outer shell, is made of an aluminum component, and between the switch handle and a lead wire and a switch terminal portion disposed inside the switch handle. A power tool having a double insulation structure, in which a resin-made insulator formed by vacuum molding is attached to the body for additional insulation.
において、 この外殻とこの外殻の内部に配設されたリード線及びス
イッチ端子部との間に真空成形により形成された樹脂製
絶縁体を装着し、 前記外殻と、この外殻の内部に配設された固定子との間
に略円筒形に成形された樹脂製絶縁体を装着し、 アーマチュアの軸の外周を樹脂製絶縁材で覆ったことを
特徴とする二重絶縁構造の電動工具。2. A power tool having an outer shell made of aluminum parts, wherein a resin formed by vacuum molding between the outer shell and lead wires and switch terminal portions arranged inside the outer shell. A resin insulator molded into a substantially cylindrical shape between the outer shell and a stator arranged inside the outer shell, and the outer periphery of the armature shaft is fitted with a resin. A double-insulation electric tool characterized by being covered with an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8157644A JPH09314481A (en) | 1996-05-28 | 1996-05-28 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8157644A JPH09314481A (en) | 1996-05-28 | 1996-05-28 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09314481A true JPH09314481A (en) | 1997-12-09 |
Family
ID=15654238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8157644A Pending JPH09314481A (en) | 1996-05-28 | 1996-05-28 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09314481A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003231071A (en) * | 2001-12-07 | 2003-08-19 | Hitachi Koki Co Ltd | Power tool and its insulation method |
| EP1382421A2 (en) | 2002-07-16 | 2004-01-21 | Black & Decker Inc. | Cordless drill with metal housing |
| CN1308122C (en) * | 1998-12-30 | 2007-04-04 | 布莱克和戴克公司 | Dual-mode non-isolated corded system for transportable cordless power tools |
-
1996
- 1996-05-28 JP JP8157644A patent/JPH09314481A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308122C (en) * | 1998-12-30 | 2007-04-04 | 布莱克和戴克公司 | Dual-mode non-isolated corded system for transportable cordless power tools |
| JP2003231071A (en) * | 2001-12-07 | 2003-08-19 | Hitachi Koki Co Ltd | Power tool and its insulation method |
| KR100455808B1 (en) * | 2001-12-07 | 2004-11-06 | 히다치 고키 가부시키 가이샤 | Electric Tool and its Insulating Method |
| US6909207B2 (en) | 2001-12-07 | 2005-06-21 | Hitachi Koki Co., Ltd. | Electric tool and its insulating method |
| EP1382421A2 (en) | 2002-07-16 | 2004-01-21 | Black & Decker Inc. | Cordless drill with metal housing |
| EP1382421A3 (en) * | 2002-07-16 | 2004-03-24 | Black & Decker Inc. | Cordless drill with metal housing |
| AU2003213501B2 (en) * | 2002-07-16 | 2008-10-23 | Black & Decker, Inc. | Cordless drill with metal housing |
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