JPWO2018180835A1 - Power tool - Google Patents

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Publication number
JPWO2018180835A1
JPWO2018180835A1 JP2018527822A JP2018527822A JPWO2018180835A1 JP WO2018180835 A1 JPWO2018180835 A1 JP WO2018180835A1 JP 2018527822 A JP2018527822 A JP 2018527822A JP 2018527822 A JP2018527822 A JP 2018527822A JP WO2018180835 A1 JPWO2018180835 A1 JP WO2018180835A1
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Prior art keywords
housing part
housing
screw
power tool
locking
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JP6581725B2 (en
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貴則 宮城
貴則 宮城
清水　裕之
裕之 清水
遠藤　大輔
大輔 遠藤
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Nitto Kohki Co Ltd
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Nitto Kohki Co Ltd
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    • 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
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Portable Power Tools In General (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

本発明は、ハウジング内部へのアクセスをより容易且つ安全に行えるようにすることができる動力工具を提供することを目的とする。本発明は、ハウジング（１２）内に整流子モータ（１４）を備える動力工具（１０）であって、ハウジング（１２）は第１ハウジング部（３０）と、第１ハウジング部（３０）に対して可動とされた第２ハウジング部（３２）と、それらを固定するタッピンネジ（３４）と、第１ハウジング部（３０）と第２ハウジング部（３２）との間に挟着されるカバー（３６）とを有する。タッピンネジ（３４）を緩めると、タッピンネジ（３４）は第１ハウジング部（３０）から離れる方向に変位して第２ハウジング部（３２）の係合リング（５０）に係合し、第２ハウジング部（３２）を該離れる方向に変位させる。これによりカバー（３６）は取り外し可能な状態となる。また、タッピンネジ（３４）を締め付けると、第２ハウジング部（３２）はタッピンネジ（３４）によって第１ハウジング部（３０）に近づく方向に変位されて、カバー（３６）が挟着された状態に戻る。【選択図】図３An object of this invention is to provide the power tool which can perform the access to the inside of a housing more easily and safely. The present invention is a power tool (10) having a commutator motor (14) in a housing (12), the housing (12) being connected to the first housing part (30) and the first housing part (30). Second housing part (32) which is movable in this manner, a tapping screw (34) for fixing them, and a cover (36) sandwiched between the first housing part (30) and the second housing part (32). ). When the tapping screw (34) is loosened, the tapping screw (34) is displaced away from the first housing part (30) and engages with the engagement ring (50) of the second housing part (32). (32) is displaced in the away direction. As a result, the cover (36) becomes removable. When the tapping screw (34) is tightened, the second housing part (32) is displaced in the direction approaching the first housing part (30) by the tapping screw (34) to return to the state where the cover (36) is clamped. . [Selection] Figure 3

Description

本発明は、ハウジング内に動力部を備える動力工具に関する。  The present invention relates to a power tool including a power unit in a housing.

ハウジング内に動力部を備える動力工具においては、一般に、作業者がハウジングを分解してハウジング内に配置された動力部等のメンテナンスを行えるようになっている。例えば特許文献１には、モータハウジングとリヤカバーとからなるハウジング内に動力部としての整流子モータを備えたグラインダが開示されている。一般に整流子モータは、回転子とともに回転する整流子にカーボンブラシを接触させて回転子に電流を供給するようになっているが、カーボンブラシは回転する整流子との摩擦により徐々に磨耗していくため定期的に交換する必要がある。このグラインダにおいては、リヤカバーをモータハウジングに対して固定している固定ネジを取り外してリヤカバーを取り外してから、カーボンブラシを交換するようになっている。  In a power tool including a power unit in a housing, an operator can generally perform maintenance on the power unit and the like disposed in the housing by disassembling the housing. For example, Patent Document 1 discloses a grinder including a commutator motor as a power unit in a housing including a motor housing and a rear cover. In general, a commutator motor is configured such that a carbon brush is brought into contact with a commutator that rotates together with the rotor and current is supplied to the rotor. However, the carbon brush gradually wears due to friction with the rotating commutator. It is necessary to exchange regularly to go. In this grinder, the carbon brush is replaced after removing the fixing screw that fixes the rear cover to the motor housing and removing the rear cover.

特開２００７−１５２４７９号公報JP 2007-152479 A

上述の従来のグラインダのようにハウジング内に配置された動力部のメンテナンスを行うためにハウジングの一部を取り外す必要のある動力工具においては、取り外したネジを紛失する虞があるし、また一旦取り外したネジを再度取り付けるには細かい作業が必要となり面倒である。また、ハウジングの一部を取り外してしまうと、ハウジング内に配置されている電子回路や配線などの部品が外部に露出するため、それら部品破損させてしまう虞もある。  In a power tool that needs to remove a part of the housing in order to perform maintenance of the power unit arranged in the housing like the above-mentioned conventional grinder, the removed screw may be lost or once removed. Reinstalling the screw again requires detailed work and is troublesome. Further, if a part of the housing is removed, parts such as electronic circuits and wirings arranged in the housing are exposed to the outside, and there is a possibility that these parts may be damaged.

本発明は、上記従来技術の問題に鑑みて、ハウジング内に動力部を備える動力工具であって、ハウジング内部へのアクセスをより容易且つ安全に行えるようにすることができる動力工具を提供することを目的とする。  In view of the above-described problems of the conventional technology, the present invention provides a power tool including a power unit in a housing, which can easily and safely access the inside of the housing. With the goal.

すなわち本発明は、
ハウジング内に動力部を備える動力工具であって、
該ハウジングが、
第１ハウジング部と、
該第１ハウジング部に対して変位可能とされた第２ハウジング部と、
該第２ハウジング部を該第１ハウジング部に対して固定するための固定手段と、
当該ハウジングの内部にアクセスするための内部アクセス開口と、
該固定手段によって固定された該第１ハウジング部と該第２ハウジング部との間に挟着されて、該内部アクセス開口を閉じるようにされたカバーと、
を備え、
該固定手段は、第１方向に回転されると該第１ハウジング部から離れる方向に変位し、該第１方向とは逆向きの第２方向に回転されると該第１ハウジング部に近づく方向に変位するようにされ、
該固定手段が、該第１方向に回転されて該第１ハウジング部から離れる方向に変位したときに、該第２ハウジング部に該離れる方向で係合して該第２ハウジング部を該離れる方向に変位させて該挟着を解除して、該カバーが該第１ハウジング部と該第２ハウジング部との間から取り外し可能となるようにされ、
該固定手段が、該第２方向に回転されて該第１ハウジング部に近づく方向に変位したときに、該第２ハウジング部に該近づく方向で係合して該第２ハウジング部を該近づく方向に変位させ、該カバーが該第１ハウジング部と該第２ハウジング部との間に挟着されるようにされた、動力工具を提供する。That is, the present invention
A power tool including a power unit in a housing,
The housing is
A first housing part;
A second housing part displaceable with respect to the first housing part;
Fixing means for fixing the second housing part to the first housing part;
An internal access opening for accessing the interior of the housing;
A cover sandwiched between the first housing part and the second housing part fixed by the fixing means and configured to close the internal access opening;
With
The fixing means is displaced in a direction away from the first housing part when rotated in the first direction, and approaches the first housing part when rotated in a second direction opposite to the first direction. To be displaced to
When the fixing means is rotated in the first direction and displaced in a direction away from the first housing part, the direction of the second housing part is engaged with the second housing part in the direction away from the second housing part. The cover is released so that the cover can be removed from between the first housing part and the second housing part,
When the fixing means is rotated in the second direction and displaced in a direction approaching the first housing part, the second housing part is engaged in the approaching direction to approach the second housing part. The power tool is provided such that the cover is sandwiched between the first housing part and the second housing part.

当該動力工具においては、第２ハウジング部を第１ハウジング部に対して固定している固定手段を回転させることにより第２ハウジング部が変位してカバーを取り外すことが可能な状態となるようになっている。このような構成により、固定手段及び第２ハウジング部を第１ハウジング部に対して完全に取り外すことなく、ハウジング内部へのアクセスが可能な状態とすることができる。したがって、ハウジング内の動力部のメンテナンス等のためにハウジング内部にアクセスする際に、固定手段を紛失することを防止するとともに、ハウジング内の動力部やその他部品を外部に過度に露出させて動力部などを破損させる可能性を低減することが可能となる。また、カバーが挟着された元の状態に戻す際には、固定手段や第２ハウジング部を第１ハウジング部に対して再度位置合わせして取り付ける必要が無く、単に固定手段を回転させるだけでよいため、従来のものに比べてその作業を容易にすることが可能となる。  In the power tool, when the fixing means that fixes the second housing part to the first housing part is rotated, the second housing part is displaced and the cover can be removed. ing. With such a configuration, it is possible to make the inside of the housing accessible without completely removing the fixing means and the second housing part from the first housing part. Therefore, when accessing the interior of the housing for maintenance of the power section in the housing, the fixing means is prevented from being lost, and the power section and other parts in the housing are excessively exposed to the outside so that the power section It is possible to reduce the possibility of damaging and the like. Further, when returning to the original state where the cover is sandwiched, there is no need to re-align and fix the fixing means or the second housing part with respect to the first housing part. Therefore, the work can be facilitated as compared with the conventional one.

該固定手段が、該第１ハウジング部に対して螺合されていて、該第１方向に回転されると緩められ、該第２方向に回転されると締め付けられるようにされた固定ネジであるようにすることができる。  The fixing means is a fixing screw that is screwed into the first housing part and is loosened when rotated in the first direction and tightened when rotated in the second direction. Can be.

さらに具体的には、
該固定ネジが、軸部と頭部とを有し、
該第２ハウジング部は、該軸部を挿通する挿通穴と、該挿通穴に連接し該頭部を受け入れる凹部と、該頭部の一部を覆うように配置され該頭部を該凹部内に保持するネジ頭部係合部とを有し、
該固定ネジが螺回されて緩められたときに、該固定ネジの頭部が該ネジ頭部係合部に係合して、該第２ハウジング部を該離れる方向に変位させるようにすることができる。またこの場合には、該ネジ頭部係合部が、中央開口を有するリング状とされ、該中央開口を通して工具を挿入して該固定ネジの螺回操作ができるようにすることができる。More specifically,
The fixing screw has a shaft portion and a head portion,
The second housing portion includes an insertion hole through which the shaft portion is inserted, a recess that is connected to the insertion hole and receives the head, and is disposed so as to cover a part of the head. A screw head engaging portion to be held in the
When the fixing screw is screwed and loosened, a head portion of the fixing screw engages with the screw head engaging portion to displace the second housing portion in the direction away from the second housing portion. Can do. Further, in this case, the screw head engaging portion is formed in a ring shape having a central opening, and a tool can be inserted through the central opening so that the fixing screw can be screwed.

また、該第１ハウジング部が、該固定ネジが螺合される樹脂製の内部延在部を有し、該固定ネジが該内部延在部にねじ込まれるタッピンネジであるあるようにすることができる。  Further, the first housing part may have a resin internal extension part into which the fixing screw is screwed, and the fixing screw may be a tapping screw screwed into the internal extension part. .

このような構成により、第１ハウジング部の製造工程において固定ネジが螺合される雌ネジ部を作製する必要がなくなり、部品製造コストを低減することが可能となる。  With such a configuration, it is not necessary to produce a female screw portion into which the fixing screw is screwed in the manufacturing process of the first housing portion, and it is possible to reduce the component manufacturing cost.

さらには、該第１ハウジング部が第１係止部を有し、該第２ハウジング部が該第１係止部と係合する第２係止部を有し、
該第１係止部と該第２係止部とが係合することにより、該第１ハウジング部に対する該第２ハウジング部の該離れる方向での変位範囲が制限され、該変位範囲内においては該固定手段が該第１ハウジング部から完全には外れないようにすることができる。Furthermore, the first housing portion has a first locking portion, the second housing portion has a second locking portion that engages with the first locking portion,
When the first locking portion and the second locking portion engage with each other, a displacement range of the second housing portion with respect to the first housing portion in the direction in which the second housing portion is separated is limited. The fixing means may be prevented from being completely detached from the first housing part.

具体的には、該第２係止部が、該第２ハウジング部に螺合された係止用ネジであり、該第１ハウジング部が該係止用ネジの先端部を受け入れる長穴を有し、該長穴の端部が該第１係止部とされているようにすることができる。  Specifically, the second locking portion is a locking screw that is screwed into the second housing portion, and the first housing portion has an elongated hole that receives the distal end portion of the locking screw. And the edge part of this elongate hole can be made into this 1st latching | locking part.

このような構成により、必要以上に第２ハウジング部を変位させることがなくなる。また固定ネジは第１ハウジング部から外れないようになっているので、固定ネジを紛失してしまうことをより確実に防止することが可能となる。  With such a configuration, the second housing portion is not displaced more than necessary. Further, since the fixing screw is prevented from being removed from the first housing portion, it is possible to more reliably prevent the fixing screw from being lost.

具体的には、該動力部がブラシを有する整流子モータであり、該ブラシが該内部アクセス開口を通して交換可能な位置に配置されているようにすることができる。  Specifically, the power unit may be a commutator motor having a brush, and the brush may be disposed at a position where it can be exchanged through the internal access opening.

以下、本発明に係る動力工具の実施形態を添付図面に基づき説明する。  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a power tool according to the present invention will be described with reference to the accompanying drawings.

本発明の一実施形態に係る動力工具の側面図である。It is a side view of a power tool concerning one embodiment of the present invention. 図１の動力工具の平面図である。It is a top view of the power tool of FIG. 図２のIII-III線に沿った側面断面図である。It is side surface sectional drawing along the III-III line of FIG. 図３のIV-IV線に沿った平面断面図である。FIG. 4 is a plan sectional view taken along line IV-IV in FIG. 3. カバーの取り外し動作を示す第１の要部断面図である。It is a 1st principal part sectional view which shows the removal operation | movement of a cover. カバーの取り外し動作を示す第２の要部断面図である。It is 2nd principal part sectional drawing which shows the removal operation | movement of a cover. カバーの取り外し動作を示す第３の要部断面図である。It is a 3rd principal part sectional view which shows the removal operation | movement of a cover. カバーの取り外し動作を示す第４の要部断面図である。It is a 4th principal part sectional view showing removal operation of a cover. 第２ハウジング部が図７の位置にまで変位した状態における、図３のIV-IV線に沿った平面断面図である。FIG. 8 is a cross-sectional plan view taken along line IV-IV in FIG. 3 in a state where the second housing portion is displaced to the position in FIG.

本発明の一実施形態に係る動力工具１０は、図１乃至図３に示すように、ハウジング１２内に動力部としての整流子モータ１４を備える電動工具である。整流子モータ１４の回転出力軸１６に傘歯歯車１８を介して駆動連結されている工具出力軸２０には、用途に合わせて円板状の研磨パッドなどの所要の部材が取り付けられる。  A power tool 10 according to an embodiment of the present invention is an electric tool including a commutator motor 14 as a power unit in a housing 12 as shown in FIGS. 1 to 3. A required member such as a disk-shaped polishing pad is attached to the tool output shaft 20 that is drivingly connected to the rotary output shaft 16 of the commutator motor 14 via a bevel gear 18 according to the application.

整流子モータ１４は、図３に示すように、ハウジング１２に対して回転可能に取り付けられた回転子２２と、回転子２２の周囲に配置されハウジング１２に固定されている固定子２４と、回転子２２に取り付けられた整流子２３に接触するように配置された２つブラシ２６と、を備える。ハウジング１２にはスイッチ２８が取り付けられており、このスイッチ２８を操作することにより整流子モータ１４の駆動をＯＮ／ＯＦＦする。ブラシ２６は、高速で回転する整流子２３と摺動するため、徐々に磨耗していく。そのため、当該動力工具１０をある程度の時間使用したら新しいブラシ２６に交換する必要がある。  As shown in FIG. 3, the commutator motor 14 includes a rotor 22 rotatably attached to the housing 12, a stator 24 disposed around the rotor 22 and fixed to the housing 12, and a rotation And two brushes 26 arranged so as to come into contact with the commutator 23 attached to the child 22. A switch 28 is attached to the housing 12, and the drive of the commutator motor 14 is turned ON / OFF by operating the switch 28. Since the brush 26 slides on the commutator 23 that rotates at high speed, the brush 26 gradually wears. Therefore, it is necessary to replace the power tool 10 with a new brush 26 after using the power tool 10 for a certain period of time.

ハウジング１２は、整流子モータ１４を保持する第１ハウジング部３０と、第１ハウジング部３０の後方に取り付けられた第２ハウジング部３２と、第２ハウジング部３２を第１ハウジング部３０に対して固定するタッピンネジ（固定手段、固定ネジ）３４と、第１ハウジング部３０と第２ハウジング部３２との間に挟着されて保持された２つのカバー３６とを有する。第２ハウジング部３２は、その前端部分３２ａが第１ハウジング部３０の後端部分の外周面３０ａを覆うようにして第１ハウジング部３０に取り付けられ、第１ハウジング部３０に対して長手軸線Ｌの方向で摺動して変位可能となっている。第１ハウジング部３０の後端凹部３０ｂと第２ハウジング部３２の前端凹部３２ｂとの間には、ハウジング１２の内部にアクセスするための内部アクセス開口３７が形成されている。この内部アクセス開口３７は、当該動力工具１０の使用状態においては、カバー３６によって閉じられている。第１ハウジング部３０は、第２ハウジング部３２内にまで延びる内部延在部３８を有し、内部延在部３８にはタッピンネジ３４がねじ込まれる穴４０が形成されている。タッピンネジ３４は内部延在部３８の穴４０の側壁にネジ溝を形成しながらこの穴４０の中にねじ込まれて固定される。第１ハウジング部３０は、その全体が樹脂により形成されており、内部延在部３８においてタッピンネジ３４のねじ込みがしやすいようにしてある。  The housing 12 includes a first housing part 30 that holds the commutator motor 14, a second housing part 32 attached to the rear of the first housing part 30, and the second housing part 32 with respect to the first housing part 30. A tapping screw (fixing means, fixing screw) 34 for fixing, and two covers 36 sandwiched and held between the first housing part 30 and the second housing part 32 are provided. The second housing portion 32 is attached to the first housing portion 30 such that the front end portion 32 a covers the outer peripheral surface 30 a of the rear end portion of the first housing portion 30, and the longitudinal axis L with respect to the first housing portion 30. It can be displaced by sliding in this direction. An internal access opening 37 for accessing the inside of the housing 12 is formed between the rear end recess 30 b of the first housing part 30 and the front end recess 32 b of the second housing part 32. The internal access opening 37 is closed by the cover 36 when the power tool 10 is in use. The first housing part 30 has an internal extension part 38 extending into the second housing part 32, and a hole 40 into which the tapping screw 34 is screwed is formed in the internal extension part 38. The tapping screw 34 is screwed into the hole 40 and fixed while forming a screw groove on the side wall of the hole 40 of the internal extension 38. The first housing part 30 is entirely formed of resin so that the tapping screw 34 can be easily screwed in the internal extension part 38.

第２ハウジング部３２には、タッピンネジ３４の軸部４２を挿通する挿通穴４６と、挿通穴４６に連接しタッピンネジ３４の頭部４４を受け入れるようにされた凹部４８と、タッピンネジ３４の頭部４４の周辺部を長手軸線Ｌの方向で覆うように凹部４８に圧入されて固定された金属製の係合リング（ネジ頭部係合部）５０とを有する。タッピンネジ３４の頭部４４は、係合リング５０によって凹部４８内に保持されている。したがって、タッピンネジ３４は第２ハウジング部３２からは取れないようになっている。タッピンネジ３４を第１ハウジング部３０に対して締め付けたり緩めたりする際には、係合リング５０の中央開口５２からドライバなどの工具を挿入して、タッピンネジ３４を螺回する。なお、凹部４８に係合リング５０を圧入する構成に代えて、凹部４８の内周面に溝を設けて、その溝に止め輪を嵌め込むことにより、ネジ頭部係合部を構成することもできる。  The second housing portion 32 has an insertion hole 46 through which the shaft portion 42 of the tapping screw 34 is inserted, a recess 48 connected to the insertion hole 46 to receive the head portion 44 of the tapping screw 34, and a head portion 44 of the tapping screw 34. And a metal engagement ring (screw head engagement portion) 50 that is press-fitted and fixed in the recess 48 so as to cover the peripheral portion thereof in the direction of the longitudinal axis L. The head 44 of the tapping screw 34 is held in the recess 48 by the engagement ring 50. Therefore, the tapping screw 34 cannot be removed from the second housing portion 32. When tightening or loosening the tapping screw 34 with respect to the first housing portion 30, a tool such as a screwdriver is inserted from the central opening 52 of the engagement ring 50 and the tapping screw 34 is screwed. In place of the configuration in which the engagement ring 50 is press-fitted into the recess 48, a groove is provided on the inner peripheral surface of the recess 48, and a retaining ring is fitted into the groove to constitute a screw head engagement portion. You can also.

第１ハウジング部３０の内部延在部３８上には、第２ハウジング部３２に覆われるようにして、回路基板６０が配置されている。回路基板６０には、当該動力工具１０の状態を表示するためのＬＥＤ６２が搭載されている。この回路基板６０は、樹脂製のケースに入れられており、第１ハウジング部３０の後方（図で見て右側）から第１ハウジング部３０の内部延長部３８に対してスライドして取り付けられる。第２ハウジング部３２におけるＬＥＤ６２と整合する位置には、ＬＥＤ６２の光を拡散するための光拡散部材６４が配置されている。これにより、ＬＥＤ６２が発した光は光拡散部材６４によって拡散されて、光拡散部材６４の外表面が略均一な明るさで光るようになり、ＬＥＤ６２の発光が視認しやすいようになっている。  A circuit board 60 is disposed on the internal extension part 38 of the first housing part 30 so as to be covered with the second housing part 32. An LED 62 for displaying the state of the power tool 10 is mounted on the circuit board 60. The circuit board 60 is placed in a resin case, and is slid and attached to the internal extension 38 of the first housing part 30 from the rear (right side in the drawing) of the first housing part 30. A light diffusing member 64 for diffusing the light of the LED 62 is disposed at a position in the second housing portion 32 that is aligned with the LED 62. As a result, the light emitted from the LED 62 is diffused by the light diffusing member 64, and the outer surface of the light diffusing member 64 shines with substantially uniform brightness, so that the light emission of the LED 62 is easily visible.

図４に示すように、第２ハウジング部３２にはさらに、長手軸線Ｌに対して直交する方向に延びる係止用ネジ（第２係止部）５４が螺合されている。また内部延在部３８には、長手軸線Ｌの方向に延びる長穴５６が形成されていて、この長穴５６が係止用ネジ５４の先端部５８を受け入れるようになっている。  As shown in FIG. 4, a locking screw (second locking portion) 54 extending in a direction orthogonal to the longitudinal axis L is further screwed into the second housing portion 32. In addition, a long hole 56 extending in the direction of the longitudinal axis L is formed in the internal extension portion 38, and this long hole 56 is configured to receive the front end portion 58 of the locking screw 54.

上述のように整流子モータ１４のブラシ２６は整流子２３との間の摩擦により磨耗していくため定期的な交換が必要になる。当該動力工具１０においては、ブラシ２６の交換を以下のような手順で行なうことができるようになっている。  As described above, the brush 26 of the commutator motor 14 is worn due to friction with the commutator 23 and therefore needs to be periodically replaced. In the power tool 10, the brush 26 can be replaced in the following procedure.

まず、図５に示すようにタッピンネジ３４によって第２ハウジング部３２が第１ハウジング部３０に対して固定されている状態から、タッピンネジ３４を左回り（第１方向）に螺回して緩める。そうするとタッピンネジ３４は第１ハウジング部３０から長手軸線Ｌに沿って離れる方向（図で見て右方）に変位し、図６に示すように頭部４４が係合リング５０に係合する。さらにタッピンネジ３４を緩めると、係合リング５０がタッピンネジ３４の頭部４４に押され、第２ハウジング部３２はタッピンネジ３４とともに第１ハウジング部３０から離れる方向に変位する。第２ハウジング部３２が図７の位置にまで変位すると、第１ハウジング部３０と第２ハウジング部３２とによるカバー３６の挟着が解除される。これにより、カバー３６は図８に示すように、第１ハウジング部３０と第２ハウジング部３２との間から取り外すことが可能となる。  First, as shown in FIG. 5, from the state where the second housing part 32 is fixed to the first housing part 30 by the tapping screw 34, the tapping screw 34 is screwed counterclockwise (first direction) and loosened. Then, the tapping screw 34 is displaced in the direction away from the first housing part 30 along the longitudinal axis L (rightward in the drawing), and the head 44 is engaged with the engagement ring 50 as shown in FIG. When the tapping screw 34 is further loosened, the engagement ring 50 is pushed by the head 44 of the tapping screw 34, and the second housing part 32 is displaced in a direction away from the first housing part 30 together with the tapping screw 34. When the second housing part 32 is displaced to the position shown in FIG. 7, the sandwiching of the cover 36 by the first housing part 30 and the second housing part 32 is released. Thereby, the cover 36 can be removed from between the first housing part 30 and the second housing part 32 as shown in FIG.

なお、第２ハウジング部３２が図７の位置となると、図９に示すように、係止用ネジ５４の先端部５８が長穴５６の端部（第１係止部）６６に係合して、第２ハウジング部３２がそれ以上第１ハウジング部３０から離れる方向に変位できないようになる。すなわち、係止用ネジ５４と長穴５６の端部６６とによって第１ハウジング部３０に対する第２ハウジング部３２の変位範囲が制限されるようになっている。タッピンネジ３４は、この変位範囲内において第１ハウジング部３０から外れない長さを有している。  When the second housing portion 32 is in the position shown in FIG. 7, as shown in FIG. 9, the distal end portion 58 of the locking screw 54 engages with the end portion (first locking portion) 66 of the elongated hole 56. Thus, the second housing part 32 can no longer be displaced in the direction away from the first housing part 30. That is, the displacement range of the second housing portion 32 relative to the first housing portion 30 is limited by the locking screw 54 and the end portion 66 of the elongated hole 56. The tapping screw 34 has a length that does not come off the first housing portion 30 within this displacement range.

図８のようにカバー３６が取り外されると、カバー３６によって覆われて閉じられていた内部アクセス開口３７が表れる。ブラシホルダ７０からの古いブラシ２６の取り外し、及びブラシホルダ７０への新しいブラシ２６の取り付けは、この内部アクセス開口３７を通して行うことができる。新しいブラシ２６をブラシホルダ７０に取り付けたら、再びカバー３６を取り付けてタッピンネジ３４を右回り（第２方向）に螺回して締め付ける。そうするとタッピンネジ３４は、第１ハウジング部３０に近づく方向に変位し第２ハウジング部３２に係合して第２ハウジング部３２を該近づく方向に変位させる。第２ハウジング部３２が第１ハウジング部３０に固定される図５の状態にまで戻るとカバー３６は再び第１ハウジング部３０と第２ハウジング部３２とによって挟着された状態となる。これでブラシ２６の交換作業は完了となる。  When the cover 36 is removed as shown in FIG. 8, the internal access opening 37 covered and closed by the cover 36 appears. Removal of the old brush 26 from the brush holder 70 and attachment of the new brush 26 to the brush holder 70 can be made through this internal access opening 37. When the new brush 26 is attached to the brush holder 70, the cover 36 is attached again, and the tapping screw 34 is screwed clockwise (second direction) and tightened. Then, the tapping screw 34 is displaced in a direction approaching the first housing part 30 and is engaged with the second housing part 32 to displace the second housing part 32 in the approaching direction. When the state returns to the state of FIG. 5 where the second housing part 32 is fixed to the first housing part 30, the cover 36 is again sandwiched between the first housing part 30 and the second housing part 32. This completes the brush 26 replacement operation.

当該動力工具１０においては、ハウジング１２内に配置されたブラシ２６などの部品の交換を行なうのに際して、ハウジング１２の一部である第２ハウジング部３２及びタッピンネジ３４を取り外す必要がない。したがって、ハウジング１２の内部に配置されている回路基板６０やＬＥＤ６２などの部品が外部に露出せず、これら部品を誤って破損させてしまう虞が少ない。また、タッピンネジ３４を紛失することも防止できる。タッピンネジは相手材の穴の内周面にネジ溝を形成しながらねじ込まれるが、一度取り付けたタッピンネジを取り外して再度同じ穴に取り付けると、前回とは違う位置にネジ溝が形成されてしまうことがある。そうすると、穴の内周面の強度が落ち、何度もそのような事を繰り返すと内周面が破壊されて最終的にはタッピンネジが保持されなくなってしまうことがある。当該動力工具１０では上述のようにタッピンネジ３４を取り外すことなくハウジング１２の内部のブラシ２６などにアクセスすることが可能であるので、タッピンネジ３４によるネジ穴の損傷を防止することができる。また、係止用ネジ５４と長穴５６とによって第２ハウジング部３２の変位範囲を制限することによってタッピンネジ３４を取り外すことができないようにすることにより、誤ってタッピンネジ３４が取り外されることがなくなり、上記問題をより確実に防止することが可能となる。  In the power tool 10, it is not necessary to remove the second housing portion 32 and the tapping screw 34 that are a part of the housing 12 when replacing parts such as the brush 26 disposed in the housing 12. Therefore, components such as the circuit board 60 and the LED 62 arranged inside the housing 12 are not exposed to the outside, and there is little possibility that these components are accidentally damaged. It is also possible to prevent the tapping screw 34 from being lost. The tapping screw is screwed in while forming a screw groove on the inner peripheral surface of the hole of the mating member, but if the tapping screw once attached is removed and attached to the same hole again, the screw groove may be formed at a position different from the previous time. is there. Then, the strength of the inner peripheral surface of the hole is lowered, and if such a thing is repeated many times, the inner peripheral surface may be destroyed and the tapping screw may not be held finally. Since the power tool 10 can access the brush 26 and the like inside the housing 12 without removing the tapping screw 34 as described above, damage to the screw hole by the tapping screw 34 can be prevented. Further, by restricting the displacement range of the second housing portion 32 by the locking screw 54 and the elongated hole 56, the tapping screw 34 cannot be removed, so that the tapping screw 34 is not accidentally removed, It becomes possible to prevent the said problem more reliably.

本発明の一実施形態に係る動力工具１０について説明をしたが、本発明はこれに限定されるものではなく、種々の変更が可能である。例えば、第１ハウジング部３０はタッピンネジ３４がねじ込まれる内部延在部３８が樹脂によって形成されていればよく、第１ハウジング部３０の全体が樹脂である必要は必ずしもない。また、第２ハウジング部３２を第１ハウジング部３０に対して固定するための固定ネジとして、タッピンネジ３４に代えて通常のネジを使用することもできる。ただしこの場合には、内部延在部３８に予め雌ネジを形成しておく必要がある。さらには、固定ネジとして、ワッシャが一体とされたネジを使用し、第２ハウジング部３２がネジの頭部４４ではなくワッシャを保持するように構成することもできる。また、第２ハウジング部３２と第１ハウジング部３０との固定手段はネジ以外のものとすることもできる。例えば、軸部に径方向外側に突出した突起部を有する部材を固定手段とし、第１ハウジング部に内周面に傾斜溝（または螺旋状溝）が形成された穴を形成しておき、固定手段の突起部を傾斜溝に係合するように取り付け、固定手段を回転させることにより第１ハウジング部に対して離れる方向及び近づく方向に変位するようにした構成とすることもできる。本発明は、整流子モータを備える電動工具に限定されるものではなく、ブラシレスモータ、エアモータ、エンジンなどの他の動力部を備える動力工具においても同様に適用可能である。また、動力工具としては、可搬型又は据置き型のドリル装置やボール盤などの工作機械も含まれる。  Although the power tool 10 according to an embodiment of the present invention has been described, the present invention is not limited to this, and various modifications are possible. For example, the first housing part 30 only needs to be formed of an internal extension part 38 into which the tapping screw 34 is screwed, and the entire first housing part 30 is not necessarily made of resin. Further, as a fixing screw for fixing the second housing part 32 to the first housing part 30, a normal screw can be used instead of the tapping screw 34. However, in this case, it is necessary to form a female screw in the internal extension portion 38 in advance. Furthermore, as a fixing screw, a screw in which a washer is integrated may be used, and the second housing part 32 may be configured to hold the washer instead of the screw head 44. Further, the fixing means for the second housing part 32 and the first housing part 30 may be other than screws. For example, a member having a protruding portion protruding radially outward on the shaft portion is used as a fixing means, and a hole in which an inclined groove (or spiral groove) is formed on the inner peripheral surface of the first housing portion is fixed and fixed. It is also possible to adopt a configuration in which the protrusions of the means are attached so as to engage with the inclined grooves, and the fixing means is rotated so as to be displaced away from and toward the first housing part. The present invention is not limited to an electric tool including a commutator motor, and can be similarly applied to a power tool including other power units such as a brushless motor, an air motor, and an engine. The power tool also includes a portable or stationary drill device or a machine tool such as a drilling machine.

動力工具１０；ハウジング１２；整流子モータ（動力部）１４；回転出力軸１６；傘歯歯車１８；工具出力軸２０；回転子２２；整流子２３；固定子２４；ブラシ２６；スイッチ２８；第１ハウジング部３０；外周面３０ａ：後端凹部３０ｂ；第２ハウジング部３２；前端部分３２ａ；前端凹部３２ｂ；タッピンネジ（固定ネジ）３４；カバー３６；内部アクセス開口３７；内部延在部３８；穴４０；軸部４２；頭部４４；挿通穴４６；凹部４８；係合リング（ネジ頭部係合部）５０；開口５２；係止用ネジ（第２係止部）５４；長穴５６；先端部５８；回路基板６０；ＬＥＤ６２；光拡散部材６４；端部（第１係止部）６６；ブラシホルダ７０；
長手軸線ＬPower tool 10; housing 12; commutator motor (power section) 14; rotation output shaft 16; bevel gear 18; tool output shaft 20; rotor 22; commutator 23; 1 housing part 30; outer peripheral surface 30a: rear end recessed part 30b; second housing part 32; front end part 32a; front end recessed part 32b; tapping screw (fixing screw) 34; cover 36; internal access opening 37; 40; shaft portion 42; head portion 44; insertion hole 46; recess 48; engagement ring (screw head engagement portion) 50; opening 52; locking screw (second locking portion) 54; Tip portion 58; circuit board 60; LED 62; light diffusion member 64; end portion (first locking portion) 66; brush holder 70;
Longitudinal axis L

Claims (8)

ハウジング内に動力部を備える動力工具であって、
該ハウジングが、
第１ハウジング部と、
該第１ハウジング部に対して変位可能とされた第２ハウジング部と、
該第２ハウジング部を該第１ハウジング部に対して固定するための固定手段と、
当該ハウジングの内部にアクセスするための内部アクセス開口と、
該固定手段によって固定された該第１ハウジング部と該第２ハウジング部との間に挟着されて、該内部アクセス開口を閉じるようにされたカバーと、
を備え、
該固定手段は、第１方向に回転されると該第１ハウジング部から離れる方向に変位し、該第１方向とは逆向きの第２方向に回転されると該第１ハウジング部に近づく方向に変位するようにされ、
該固定手段が、該第１方向に回転されて該第１ハウジング部から離れる方向に変位したときに、該第２ハウジング部に該離れる方向で係合して該第２ハウジング部を該離れる方向に変位させて該挟着を解除して、該カバーが該第１ハウジング部と該第２ハウジング部との間から取り外し可能となるようにされ、
該固定手段が、該第２方向に回転されて該第１ハウジング部に近づく方向に変位したときに、該第２ハウジング部に該近づく方向で係合して該第２ハウジング部を該近づく方向に変位させ、該カバーが該第１ハウジング部と該第２ハウジング部との間に挟着されるようにされた、動力工具。A power tool including a power unit in a housing,
The housing is
A first housing part;
A second housing part displaceable with respect to the first housing part;
Fixing means for fixing the second housing part to the first housing part;
An internal access opening for accessing the interior of the housing;
A cover sandwiched between the first housing part and the second housing part fixed by the fixing means and configured to close the internal access opening;
With
The fixing means is displaced in a direction away from the first housing part when rotated in the first direction, and approaches the first housing part when rotated in a second direction opposite to the first direction. To be displaced to
When the fixing means is rotated in the first direction and displaced in a direction away from the first housing part, the direction of the second housing part is engaged with the second housing part in the direction away from the second housing part. The cover is released so that the cover can be removed from between the first housing part and the second housing part,
When the fixing means is rotated in the second direction and displaced in a direction approaching the first housing part, the second housing part is engaged in the approaching direction to approach the second housing part. The power tool, wherein the cover is sandwiched between the first housing part and the second housing part. 該固定手段が、該第１ハウジング部に対して螺合されていて、該第１方向に回転されると緩められ、該第２方向に回転されると締め付けられるようにされた固定ネジである、請求項１に記載の動力工具。  The fixing means is a fixing screw that is screwed into the first housing part and is loosened when rotated in the first direction and tightened when rotated in the second direction. The power tool according to claim 1. 該固定ネジが、軸部と頭部とを有し、
該第２ハウジング部は、該軸部を挿通する挿通穴と、該挿通穴に連接し該頭部を受け入れる凹部と、該頭部の一部を覆うように配置され該頭部を該凹部内に保持するネジ頭部係合部とを有し、
該固定ネジが螺回されて緩められたときに、該固定ネジの頭部が該ネジ頭部係合部に係合して、該第２ハウジング部を該離れる方向に変位させるようにされた、請求項２に記載の動力工具。The fixing screw has a shaft portion and a head portion,
The second housing portion includes an insertion hole through which the shaft portion is inserted, a recess that is connected to the insertion hole and receives the head, and is disposed so as to cover a part of the head. A screw head engaging portion to be held in the
When the fixing screw is screwed and loosened, the head of the fixing screw engages with the screw head engaging portion to displace the second housing portion in the away direction. The power tool according to claim 2. 該ネジ頭部係合部が、中央開口を有するリング状とされ、該中央開口を通して工具を挿入して該固定ネジの螺回操作ができるようにした、請求項３に記載の動力工具。  4. The power tool according to claim 3, wherein the screw head engaging portion is formed in a ring shape having a central opening, and the tool is inserted through the central opening so that the fixing screw can be screwed. 5. 該第１ハウジング部が、該固定ネジが螺合される樹脂製の内部延在部を有し、該固定ネジが該内部延在部にねじ込まれるタッピンネジである、請求項２乃至４のいずれか一項に記載の動力工具。  The first housing part has a resin internal extension part into which the fixing screw is screwed, and the fixing screw is a tapping screw screwed into the internal extension part. The power tool according to one item. 該第１ハウジング部が第１係止部を有し、該第２ハウジング部が該第１係止部と係合する第２係止部を有し、
該第１係止部と該第２係止部とが係合することにより、該第１ハウジング部に対する該第２ハウジング部の該離れる方向での変位範囲が制限され、該変位範囲内においては該固定手段が該第１ハウジング部から完全には外れないようにされている、請求項１乃至５の何れか一項に記載の動力工具。The first housing part has a first locking part, the second housing part has a second locking part engaged with the first locking part;
When the first locking portion and the second locking portion engage with each other, a displacement range of the second housing portion with respect to the first housing portion in the direction in which the second housing portion is separated is limited. The power tool according to any one of claims 1 to 5, wherein the fixing means is not completely detached from the first housing part. 該第２係止部が、該第２ハウジング部に螺合された係止用ネジであり、該第１ハウジング部が該係止用ネジの先端部を受け入れる長穴を有し、該長穴の端部が該第１係止部とされている、請求項６に記載の動力工具。  The second locking portion is a locking screw screwed into the second housing portion, and the first housing portion has an elongated hole for receiving a distal end portion of the locking screw, the elongated hole The power tool according to claim 6, wherein an end of the first tool is the first locking portion. 該動力部がブラシを有する整流子モータであり、該ブラシが該内部アクセス開口を通して交換可能な位置に配置されている、請求項１乃至７の何れか一項に記載の動力工具。  The power tool according to any one of claims 1 to 7, wherein the power unit is a commutator motor having a brush, and the brush is disposed at a position where the brush can be exchanged through the internal access opening.
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