JP7153541B2 - Rotary tool and engaging member provided therewith - Google Patents

Rotary tool and engaging member provided therewith Download PDF

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JP7153541B2
JP7153541B2 JP2018221276A JP2018221276A JP7153541B2 JP 7153541 B2 JP7153541 B2 JP 7153541B2 JP 2018221276 A JP2018221276 A JP 2018221276A JP 2018221276 A JP2018221276 A JP 2018221276A JP 7153541 B2 JP7153541 B2 JP 7153541B2
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drive switch
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賢一 東
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Daihatsu Motor Co Ltd
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Description

本発明は、ボルトやナット等のねじの締め付け作業を行うインパクトレンチ等の回転工具に関する。 The present invention relates to a rotary tool such as an impact wrench for tightening screws such as bolts and nuts.

自動車等の組立工程では、作業者がインパクトレンチ等の回転工具を用いてボルトやナット等の締め付けを行うことがある。このような組立工程で用いられる回転工具は、トリガーの操作量(引き込み量)に応じてモータの回転速度を調節することができるものが一般的である。すなわち、トリガーの引き込み量が小さいときはモータが低速で回転し、トリガーの引き込み量を大きくするにつれて、モータの回転速度が速くなる。 2. Description of the Related Art In a process of assembling automobiles and the like, workers sometimes use rotary tools such as impact wrenches to tighten bolts and nuts. A rotary tool used in such an assembly process is generally capable of adjusting the rotation speed of a motor according to the amount of operation (pull-in amount) of a trigger. That is, the motor rotates at a low speed when the amount of trigger retraction is small, and the rotational speed of the motor increases as the amount of retraction of the trigger increases.

上記のような回転工具を用いてボルトを締め付ける際、ボルトとねじ穴とが同軸にセットされていないと、焼き付き(ねじかじり)が発生する。ねじかじりが生じると、ねじ山を補修する必要があり、また、重度のねじかじりは補修できないため、部品を交換する必要があり、何れの場合も工数及び材料コストが増大する。このような不具合を回避するために、作業者は、ボルトの締め付け初期に、トリガーを小さい引き込み量で維持してモータを低速で回転させながら、回転工具の姿勢を調整してボルトとねじ穴とを同軸に配した状態で、両者のねじを噛み合わせる必要がある。しかし、このような作業は容易ではない。特に、場所によっては、ボルトを取り付ける面に正対できない場合や、利き腕でない手で回転工具を持って作業したりしなければならない場合があり、このような場合、トリガーを所定の引き込み量で維持しながら、回転工具を所定の姿勢で保持してボルトとねじ穴とを正常に噛み合わせる作業は非常に困難であり、習熟を要する。 When tightening a bolt using a rotating tool such as the one described above, if the bolt and the screw hole are not set coaxially, seizure (screw galling) will occur. When screw galling occurs, the thread must be repaired, and since severe screw galling cannot be repaired, parts must be replaced, both of which increase man-hours and material costs. In order to avoid such problems, in the initial stage of bolt tightening, the operator maintains the trigger with a small retraction amount and rotates the motor at a low speed, while adjusting the attitude of the rotary tool so that the bolt and the threaded hole are aligned. are arranged coaxially, and the screws of both must be meshed. However, such work is not easy. In particular, depending on the location, you may not be able to face the bolt mounting surface, or you may have to work with a rotary tool with your non-dominant hand. However, it is extremely difficult to hold the rotary tool in a predetermined position and properly mesh the bolt with the screw hole, and requires skill.

例えば、下記の特許文献1に示されている回転工具は、モータの駆動開始後、所定時間が経過するまでの初期駆動期間中はモータが低速で回転し、初期駆動期間が経過するとモータが高速回転に自動的に切り替わるように制御される。この場合、ボルトの締め付け初期に、トリガーを小さい引き込み量で維持する必要がなくなるため、ボルトの締め付け作業が容易になる。 For example, in the rotary tool disclosed in Patent Document 1 below, the motor rotates at a low speed during an initial drive period until a predetermined time elapses after the motor starts to rotate, and after the initial drive period has elapsed, the motor rotates at a high speed. controlled to automatically switch to rotation. In this case, since it is not necessary to keep the trigger with a small retraction amount at the initial stage of bolt tightening, the bolt tightening work becomes easier.

特開2016-78230号公報JP 2016-78230 A

しかし、上記のようにモータの低速回転から高速回転への切り替えを時間で制御する場合、低速回転させている間にボルトをねじ穴に正常に噛み合わせることができないと、自動的に高速回転に切り替わってしまうため、ねじかじりが生じる恐れがある。また、上記のようにモータの回転速度を時間で制御するためには、モータの制御プログラム等を変更する必要があるため、コストがかかる。 However, when controlling the switching from low-speed to high-speed rotation of the motor by time as described above, if the bolt cannot be properly engaged with the screw hole during low-speed rotation, the motor will automatically switch to high-speed rotation. Since it is switched, there is a risk of screw galling. In addition, in order to control the rotational speed of the motor by time as described above, it is necessary to change the control program of the motor, etc., which is costly.

そこで、本発明は、ねじかじりを確実に防止すると共に、コストを抑えながら、回転工具によるねじの締め付け作業を容易化することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to reliably prevent screw galling and to facilitate tightening operations of screws using a rotating tool while reducing costs.

前記課題を解決するために、本発明は、モータを有する本体と、前記本体に対してスライド可能に設けられ、スライド量に応じて前記モータの回転速度を変化させる駆動スイッチとを備えた回転工具であって、
前記駆動スイッチ及び前記本体に、前記駆動スイッチのスライド量が最大値よりも小さい所定値に達したときにスライド方向で互いに係合する係合部を設けた回転工具を提供する。
In order to solve the above-mentioned problems, the present invention provides a rotary tool comprising a main body having a motor, and a drive switch provided slidably with respect to the main body and changing the rotation speed of the motor according to the amount of sliding. and
A rotary tool is provided in which the drive switch and the main body are provided with engaging portions that engage with each other in the sliding direction when the sliding amount of the drive switch reaches a predetermined value smaller than the maximum value.

この回転工具では、駆動スイッチを操作してスライド量が所定値に達したら、本体に設けられた係合部と駆動スイッチに設けられた係合部とが係合することで、駆動スイッチの操作に抵抗が付与される。作業者は、抵抗を感じる位置で駆動スイッチを保持することで、モータを低速回転で容易に維持することができるため、締め付け初期にねじを正常に噛み合わせる作業が容易になる。この場合、制御プログラムを変更する必要がないためコストが抑えられる。また、作業者が自分の意思で駆動スイッチを段階的にスライドさせることができるため、モータの回転速度が自動的に高速に切り替わってねじかじりが生じる事態を防止できる。 In this rotary tool, when the drive switch is operated and the amount of slide reaches a predetermined value, the engagement portion provided on the main body and the engagement portion provided on the drive switch are engaged with each other, whereby the drive switch is operated. is given resistance. By holding the drive switch at a position where resistance is felt, the operator can easily maintain the motor rotating at a low speed. In this case, costs can be reduced because there is no need to change the control program. In addition, since the operator can voluntarily slide the drive switch step by step, it is possible to prevent the rotation speed of the motor from automatically switching to a high speed, thereby preventing the occurrence of screw galling.

回転工具の本体には、ねじを締め付ける正方向とねじを緩める逆方向との間でモータの回転方向を切り換える切換レバーが設けられることがある。この切換レバーに、本体側の係合部を設ければ、係合部を有する別途の部材を設ける場合と比べて、部品数が削減され、コストを低減することができる。 The main body of the rotary tool is sometimes provided with a switching lever for switching the rotation direction of the motor between the forward direction for tightening the screw and the reverse direction for loosening the screw. If the switching lever is provided with the engaging portion on the main body side, the number of parts can be reduced and the cost can be reduced as compared with the case where a separate member having the engaging portion is provided.

作業者が、ねじが正常に噛み合ったことを確認したら、駆動スイッチ側の係合部と本体側の係合部との係合を解除し、駆動スイッチのスライド量をさらに大きくすることで、モータを高速で回転させることができる。このとき、駆動スイッチのスライドを支持する支持機構に設けられた遊びを利用して、駆動スイッチをスライド方向と直交する方向に移動させることにより、両係合部の係合を解除するようにすれば、両係合部の係合を解除するための機構を簡素化できる。 After confirming that the screws are properly engaged, the operator releases the engagement between the engaging portion on the drive switch side and the engaging portion on the main body side, and further increases the amount of sliding of the drive switch to allow the motor to operate. can be rotated at high speed. At this time, by using the play provided in the support mechanism for supporting the sliding of the drive switch, the drive switch is moved in a direction orthogonal to the sliding direction, thereby releasing the engagement between the two engaging portions. If so, the mechanism for releasing the engagement between the two engaging portions can be simplified.

例えば、モータを有する本体と、前記本体に対してスライド可能に設けられ、スライド量に応じて前記モータの回転速度を変化させる駆動スイッチとを備えた一般的な回転工具の駆動スイッチに、前記駆動スイッチのスライド量が最大値よりも小さい所定値に達したときに、前記本体に設けられた係合部とスライド方向で係合する係合部を有する係合部材を取り付ければ、本発明に係る上記の回転工具を得ることができる。 For example, a drive switch for a general rotary tool comprising a main body having a motor and a drive switch provided slidably with respect to the main body for changing the rotational speed of the motor according to the amount of sliding may include the drive switch. If an engaging member having an engaging portion that engages with the engaging portion provided on the main body in the sliding direction when the sliding amount of the switch reaches a predetermined value smaller than the maximum value, the present invention can be applied. A rotary tool as described above can be obtained.

以上のように、本発明の回転工具では、制御によりモータの回転速度が自動で切り替わるのではなく、作業者の意思で駆動スイッチのスライド量、すなわちモータの回転速度を調整することができるため、コストを抑えつつねじかじりを確実に防止することができる。また、駆動スイッチ側の係合部と本体側の係合部との機械的な係合により駆動スイッチを所定のスライド量で容易に保持することができるため、ねじを正常に噛み合わせる作業が容易化される。 As described above, in the rotary tool of the present invention, the rotation speed of the motor is not automatically switched by control, but the amount of slide of the drive switch, that is, the rotation speed of the motor can be adjusted by the operator's intention. It is possible to reliably prevent screw galling while suppressing costs. In addition, the drive switch can be easily held by a predetermined amount of sliding due to the mechanical engagement between the engaging portion on the drive switch side and the engaging portion on the main body side. become.

回転工具の側面図である。It is a side view of a rotary tool. 上記回転工具に設けられる駆動スイッチ機構の一部断面側面図である。FIG. 4 is a partially cross-sectional side view of a drive switch mechanism provided in the rotary tool; 上記駆動スイッチ機構の上面図であり、モータの回転を規制する状態を示す。It is a top view of the said drive switch mechanism, and shows the state which restricts rotation of a motor. 上記駆動スイッチ機構の上面図であり、モータを正方向(ねじを締め付ける方向)に回転させる状態を示す。It is a top view of the said drive switch mechanism, and shows the state which rotates a motor forward (direction to tighten a screw). 上記駆動スイッチ機構の上面図であり、モータを逆方向(ねじを緩める方向)に回転させる状態を示す。It is a top view of the said drive switch mechanism, and shows the state which rotates a motor in a reverse direction (direction to loosen a screw). 図4の駆動スイッチ機構の上面図であり、トリガーの係合部材と切換レバーの係合部とを係合させた状態を示す。FIG. 5 is a top view of the drive switch mechanism of FIG. 4, showing a state in which the engaging member of the trigger and the engaging portion of the switching lever are engaged; 図6の駆動スイッチ機構のトリガーをさらに引き込んだ状態を示す。7 shows a state in which the trigger of the drive switch mechanism of FIG. 6 is further pulled; 図7の駆動スイッチ機構のトリガーをさらに引き込んだ状態を示す。8 shows a state in which the trigger of the drive switch mechanism of FIG. 7 is further pulled; 他の実施形態に係る係合部材の上面図である。It is a top view of an engaging member concerning other embodiments. さらに他の実施形態に係る係合部材の上面図である。FIG. 11 is a top view of an engaging member according to still another embodiment;

以下、本発明の実施の形態を図面に基づいて説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

本実施形態に係る回転工具としてのインパクトレンチ1は、図1に示すように、本体10と、本体10に対して着脱可能なバッテリー20とを主に備える。本体10のケース11の内部には、モータ12と、モータ12の回転を減速する減速機構13と、減速機構から出力された回転に打撃力を加える打撃機構14と、モータ12の回転速度を制御する制御部15とが設けられる。打撃機構14の出力軸には、各種工具(例えばソケット30)が取り付けられる。尚、本実施形態では、図1に示すようにモータ12の回転軸方向(以下、「モータ軸方向」と言う。)を水平とし、モータ12が上側、バッテリー20が下側になるように本体10を配置した状態で各部位の説明を行う。このとき、モータ軸方向(図1の左右方向)及び上下方向の双方と直交する方向(図1の紙面と直交する方向)を幅方向と言う。 An impact wrench 1 as a rotary tool according to this embodiment mainly includes a main body 10 and a battery 20 detachable from the main body 10, as shown in FIG. Inside the case 11 of the main body 10 are a motor 12, a deceleration mechanism 13 for decelerating the rotation of the motor 12, a striking mechanism 14 for applying an impact force to the rotation output from the deceleration mechanism, and a controller for controlling the rotational speed of the motor 12. A control unit 15 is provided. Various tools (for example, a socket 30) are attached to the output shaft of the striking mechanism 14. As shown in FIG. In this embodiment, as shown in FIG. 1, the main body is arranged so that the rotation axis direction of the motor 12 (hereinafter referred to as "motor axis direction") is horizontal, the motor 12 is on the upper side, and the battery 20 is on the lower side. Each part will be explained with 10 arranged. At this time, the direction perpendicular to both the motor shaft direction (horizontal direction in FIG. 1) and the vertical direction (direction perpendicular to the paper surface of FIG. 1) is called the width direction.

インパクトレンチ1は、作業者が操作するための駆動スイッチ機構40を有する。駆動スイッチ機構40は、本体10のケース11に固定されたスイッチ本体41と、本体10に対してモータ軸方向にスライド可能に設けられた駆動スイッチとしてのトリガー42と、本体10に対して幅方向にスライド可能に設けられた切換スイッチ43とを備える。トリガー42は、本体10のケース11から前方(図1の左側)に突出しており、切換スイッチ43は本体10のケース11から幅方向両側に突出している。 The impact wrench 1 has a drive switch mechanism 40 operated by an operator. The drive switch mechanism 40 includes a switch body 41 fixed to the case 11 of the main body 10, a trigger 42 as a drive switch provided slidably in the motor shaft direction with respect to the main body 10, and a width direction with respect to the main body 10. and a changeover switch 43 slidably provided in. The trigger 42 protrudes forward (to the left in FIG. 1) from the case 11 of the main body 10, and the selector switch 43 protrudes from the case 11 of the main body 10 on both sides in the width direction.

図2に示すように、スイッチ本体41は、ハウジング41aと、ハウジング41aに対してモータ軸方向に往復動可能に取り付けられたスライド軸41bと、ハウジング41aに対して回転可能に取り付けられた上下方向の回転軸41cとを有する。ハウジング41aの内部には、スライド軸41bを支持する軸受41dと、スライド軸41bのスライド量を検知するスライド量検知部41eと、回転軸41cの回転角によって切り替わる切換センサ41fとが設けられる。スライド軸41b及び軸受41dとで、トリガー42のスライドを支持する支持機構が構成される。スライド軸41bは、図示しない付勢手段によりハウジング41aから前方に突出する側、すなわちトリガー42を後退させる側(図2の左側)に付勢されている。 As shown in FIG. 2, the switch body 41 includes a housing 41a, a slide shaft 41b attached to the housing 41a so as to reciprocate in the motor shaft direction, and a slide shaft 41b attached to the housing 41a so as to rotate vertically. and a rotating shaft 41c. Inside the housing 41a, there are provided a bearing 41d that supports the slide shaft 41b, a slide amount detector 41e that detects the slide amount of the slide shaft 41b, and a switching sensor 41f that switches depending on the rotation angle of the rotation shaft 41c. A support mechanism for supporting the slide of the trigger 42 is configured by the slide shaft 41b and the bearing 41d. The slide shaft 41b is biased by biasing means (not shown) toward the side projecting forward from the housing 41a, that is, toward the side that causes the trigger 42 to retreat (left side in FIG. 2).

トリガー42は、作業者が押圧する本体部42aと、スイッチ本体41のスライド軸41bに取り付けられる取付部42bと、係止片42cとを有する。本実施形態では、本体部42a、取付部42b、及び係止片42cが樹脂で一体成形される。 The trigger 42 has a body portion 42a to be pressed by an operator, an attachment portion 42b attached to the slide shaft 41b of the switch body 41, and a locking piece 42c. In this embodiment, the main body portion 42a, the attachment portion 42b, and the locking piece 42c are integrally molded with resin.

作業者が、付勢手段の付勢力に抗してトリガー42を引き込み、スイッチ本体41に接近する側(図2の右側)にスライドさせることにより、モータ12が回転駆動される。このときのトリガー42のスライド量、すなわちスライド軸41bのスライド量を、スライド量検知部41eが検知し、その信号が制御部15に伝達され、トリガー42のスライド量に応じた回転速度でモータ12を回転させる。具体的には、トリガー42のスライド量が所定値を超えたらモータ12の回転を開始し、トリガー42のスライド量が大きくなるにつれてモータ12の回転速度を徐々に大きくし、トリガー42のスライド量が最大値に達するとモータ12の回転速度が最大となる。 The operator draws in the trigger 42 against the urging force of the urging means and slides it toward the switch body 41 (right side in FIG. 2) to rotate the motor 12 . The amount of slide of the trigger 42 at this time, that is, the amount of slide of the slide shaft 41b is detected by the slide amount detection unit 41e, and the signal is transmitted to the control unit 15. to rotate. Specifically, when the amount of slide of the trigger 42 exceeds a predetermined value, the rotation of the motor 12 is started. When the maximum value is reached, the rotation speed of the motor 12 becomes maximum.

スイッチ本体41の回転軸41cには、切換レバー44が取り付けられる。切換レバー44は、レバー本体44aと、レバー本体44aから上方に突出したピン44bと、レバー本体44aの先端から下方に延びる係合部44cとを有する。図示例では、レバー本体44a、ピン44b、及び係合部44cが樹脂で一体成形される。切換レバー44のピン44bは、切換スイッチ43に設けられた長穴43aに挿入されている。切換スイッチ32及び切換レバー44は、モータ12の回転を規制する回転規制位置(図3参照)と、モータ12を正方向に回転させる正回転位置(図4参照)と、モータを逆方向に回転させる逆回転位置(図5参照)との間で移動可能とされる。 A switching lever 44 is attached to the rotary shaft 41 c of the switch body 41 . The switching lever 44 has a lever body 44a, a pin 44b projecting upward from the lever body 44a, and an engaging portion 44c extending downward from the tip of the lever body 44a. In the illustrated example, the lever body 44a, the pin 44b, and the engaging portion 44c are integrally molded of resin. A pin 44 b of the switching lever 44 is inserted into an elongated hole 43 a provided in the switching switch 43 . The change-over switch 32 and the change-over lever 44 have a rotation restriction position (see FIG. 3) that restricts the rotation of the motor 12, a forward rotation position (see FIG. 4) that rotates the motor 12 in the forward direction, and a forward rotation position (see FIG. 4) that rotates the motor in the reverse direction. It is movable between a reverse rotation position (see FIG. 5) that allows

図3に示すように、切換スイッチ43を回転規制位置に配した状態では、切換レバー44の係合部44cと、トリガー42の係止片42cとがスライド方向で対向し、これらが係合することによりトリガー42の引き込み操作(スイッチ本体41に接近する側へのスライド)が規制される。このとき、モータ12の回転が開始する前に、トリガー42の係止片42cと切換レバー44の係合部44cとを係合させることで、モータ12の回転開始が規制される。 As shown in FIG. 3, when the change-over switch 43 is placed at the rotation restricting position, the engagement portion 44c of the change-over lever 44 and the locking piece 42c of the trigger 42 face each other in the sliding direction and are engaged. As a result, the pull-in operation of the trigger 42 (slide to the side approaching the switch body 41) is restricted. At this time, by engaging the engaging piece 42c of the trigger 42 with the engaging portion 44c of the switching lever 44 before the rotation of the motor 12 starts, the rotation of the motor 12 is restricted.

切換スイッチ43を、図4に示す正回転位置にスライドさせると、切換スイッチ43の長穴43aと切換レバー44のピン44bとが係合して切換レバー44が回転軸41cを中心に図中反時計回り方向に回転する。このとき、回転軸41cが回転することで、スイッチ本体41の切換センサ41fが作動し、その信号が制御部15に伝達され、モータ12の回転方向が正方向(ねじを締め付ける方向)とされる。このとき、切換レバー44の係合部44cは、トリガー42の係止片42cに対して幅方向一方側にずれており、スライド方向で係合しない位置に配されるため、トリガー42がスライド可能な状態となっている。従って、作業者がトリガー42を引き込むことにより、モータ12が正方向に回転する。 When the change-over switch 43 is slid to the forward rotation position shown in FIG. 4, the elongated hole 43a of the change-over switch 43 and the pin 44b of the change-over lever 44 are engaged with each other, causing the change-over lever 44 to rotate about the rotation shaft 41c. Rotate clockwise. At this time, the rotation of the rotating shaft 41c activates the switching sensor 41f of the switch body 41, the signal is transmitted to the control unit 15, and the rotation direction of the motor 12 is set to the positive direction (the direction in which the screw is tightened). . At this time, the engaging portion 44c of the switching lever 44 is displaced to one side in the width direction with respect to the locking piece 42c of the trigger 42, and is disposed at a position where it does not engage in the sliding direction, so that the trigger 42 can slide. It is in a good state. Therefore, when the operator pulls in the trigger 42, the motor 12 rotates in the forward direction.

切換スイッチ43を、図5に示す逆回転位置にスライドさせると、切換レバー44が回転軸41cを中心に図中時計周り方向に回転する。このとき、回転軸41cが回転することで、スイッチ本体41の切換センサ41fが作動し、その信号が制御部15に伝達され、モータ12の回転方向が逆方向(ねじを緩める方向)とされる。このとき、切換レバー44の係合部44cは、トリガー42の係止片42cに対して幅方向他方側にずれており、スライド方向で係合しない位置に配されるため、トリガー42がスライド可能な状態となっている。従って、作業者がトリガー42を引き込むことにより、モータ12が逆方向に回転する。 When the change-over switch 43 is slid to the reverse rotation position shown in FIG. 5, the change-over lever 44 rotates clockwise around the rotating shaft 41c. At this time, the rotation of the rotating shaft 41c activates the switching sensor 41f of the switch body 41, the signal is transmitted to the control unit 15, and the rotation direction of the motor 12 is reversed (in the direction of loosening the screw). . At this time, the engaging portion 44c of the switching lever 44 is shifted to the other side in the width direction with respect to the locking piece 42c of the trigger 42, and is disposed at a position where it does not engage in the sliding direction, so that the trigger 42 can slide. It is in a good state. Therefore, when the operator pulls in the trigger 42, the motor 12 rotates in the opposite direction.

以上がインパクトレンチ1の基本的構成であり、以下、本発明の特徴的構成である係合部材45について説明する。 The basic configuration of the impact wrench 1 has been described above, and the engaging member 45, which is a characteristic configuration of the present invention, will be described below.

図2及び図3に示すように、トリガー42には係合部材45が設けられる。係合部材45は、トリガー42の本体部42aに収容され、例えば、係止片42cに接着等の適宜の手段で固定される。係合部材45は、図4に示す正回転位置に配された切換レバー44の係合部44cとスライド方向で係合する係合部としての係合面45aを有する。係合面45aは、例えばスライド方向と直交する平坦面である。図示例では、トリガー42の本体部42aの幅方向中央に係止片42cが設けられ、その幅方向一方側に係合面45aが設けられる。係合部材45とトリガー42の本体部42aの側壁との間には、切換レバー44の係合部44cが侵入可能な幅方向隙間Gが設けられる。 As shown in FIGS. 2 and 3, the trigger 42 is provided with an engaging member 45 . The engaging member 45 is accommodated in the main body portion 42a of the trigger 42, and fixed to the locking piece 42c by an appropriate means such as adhesion. The engaging member 45 has an engaging surface 45a as an engaging portion that engages in the sliding direction with the engaging portion 44c of the switching lever 44 arranged at the forward rotation position shown in FIG. The engaging surface 45a is, for example, a flat surface orthogonal to the sliding direction. In the illustrated example, a locking piece 42c is provided at the center in the width direction of the body portion 42a of the trigger 42, and an engagement surface 45a is provided on one side in the width direction. Between the engaging member 45 and the side wall of the body portion 42a of the trigger 42, a widthwise gap G is provided in which the engaging portion 44c of the switching lever 44 can enter.

切換レバー44を図4に示す正回転位置に配した状態でトリガー42を引き込み、所定の操作量を越えると、モータ12が回転し始める。その後、トリガー42の引き込み量が大きくなるにつれて、モータ12の回転速度が徐々に速くなる。そして、図6に示すように、トリガー42に設けられた係合部材45の係合面45aが切換レバー44の係合部44cに当接すると、トリガー42の操作に抵抗が付与され、トリガー42が停止する(この位置を「中間位置」と言う。)。このとき、モータ12の回転速度が十分に低速(例えば5回転/秒以下)となるように、係合面45aの位置が設定される。 When the trigger 42 is pulled in with the switching lever 44 placed in the forward rotation position shown in FIG. After that, as the amount of retraction of the trigger 42 increases, the rotational speed of the motor 12 gradually increases. Then, as shown in FIG. 6, when the engaging surface 45a of the engaging member 45 provided on the trigger 42 contacts the engaging portion 44c of the switching lever 44, resistance is applied to the operation of the trigger 42, and the trigger 42 stops (this position is called an "intermediate position"). At this time, the position of the engaging surface 45a is set so that the rotation speed of the motor 12 is sufficiently low (for example, 5 rotations/second or less).

このように、係合部材45と切換レバー44との機械的な係合によりトリガー42の操作に抵抗を付与することで、作業者は、トリガー42を、抵抗がある中間位置で容易に保持することができる。これにより、トリガー42を微妙な位置で保持する難易度の高い操作を要することなく、モータ12を低速且つ一定速度で回転させることができるため、ボルトとねじ穴のねじを正常に噛み合わせる作業が容易化される。 In this way, by applying resistance to the operation of the trigger 42 through mechanical engagement between the engaging member 45 and the switching lever 44, the operator can easily hold the trigger 42 at an intermediate position where there is resistance. be able to. As a result, the motor 12 can be rotated at a low and constant speed without the need for a highly difficult operation to hold the trigger 42 at a delicate position. facilitated.

そして、作業者が、ボルトのねじとねじ穴のねじとが正常に噛み合ったことを確認したら、トリガー42の係合部材45と切換レバー44の係合部44cとの係合を解除して、トリガー42を中間位置よりもさらに引き込む。本実施形態では、トリガー42を所定以上の力で引き込むことにより、トリガー42の係合部材45と切換レバー44の係合部44cとの係合が解除されるようになっている。具体的には、トリガー42のスライドを支持する支持機構、すなわち、スイッチ本体41のスライド軸41bとこれを支持する軸受41d(図2参照)との間に、スライド方向と直交する方向(半径方向)の遊びが設けられ、この遊びを利用して、トリガー42をスライド方向と直交する方向(図示例では幅方向に移動させることができる。具体的に、係合部材45の係合面45aと切換レバー44の係合部44cとが係合した状態で作業者がトリガー42を引き込むと、スライド軸41bが傾斜しながらトリガー42が幅方向他方側(図中上側)に移動し、これにより係合部材45の係合面45aと切換レバー44の係合部44cとの係合が解除される(図7参照)。 When the operator confirms that the screw of the bolt and the screw of the threaded hole are properly engaged, the engagement between the engaging member 45 of the trigger 42 and the engaging portion 44c of the switching lever 44 is released. The trigger 42 is pulled further than the intermediate position. In this embodiment, the engagement between the engaging member 45 of the trigger 42 and the engaging portion 44c of the switching lever 44 is released by pulling the trigger 42 with a force greater than or equal to a predetermined force. Specifically, between the support mechanism that supports the slide of the trigger 42, that is, the slide shaft 41b of the switch body 41 and the bearing 41d (see FIG. 2) that supports the slide shaft 41b, a direction perpendicular to the slide direction (radial direction) is provided. ) is provided, and this play can be used to move the trigger 42 in a direction perpendicular to the sliding direction (in the illustrated example, in the width direction). When the operator pulls in the trigger 42 while it is engaged with the engaging portion 44c of the switching lever 44, the trigger 42 moves to the other side in the width direction (upper side in the drawing) while the slide shaft 41b is tilted. The engagement between the engaging surface 45a of the joining member 45 and the engaging portion 44c of the switching lever 44 is released (see FIG. 7).

さらにトリガー42を引き込むと、図8に示すように、切換レバー44の係合部44cが、係合部材45とトリガー42の本体部42aの側壁との間の隙間Gに嵌まり込む。これにより、トリガー42が中間位置を越えてスライドし、モータ12が高速で回転する。そして、ボルトが所定位置まで締め付けられたら、モータ12に所定以上のトルクが加わり、このトルクを検知することでモータ12の回転が停止される。 When the trigger 42 is further pulled in, the engaging portion 44c of the switching lever 44 is fitted into the gap G between the engaging member 45 and the side wall of the body portion 42a of the trigger 42, as shown in FIG. This causes the trigger 42 to slide past the intermediate position and the motor 12 to rotate at high speed. Then, when the bolt is tightened to a predetermined position, a torque greater than a predetermined amount is applied to the motor 12, and the rotation of the motor 12 is stopped by detecting this torque.

一方、切換レバー44を逆回転位置(図5参照)に配した状態では、係合部材45の係合面45aと切換レバー44の係合部44cとが最初から幅方向でずれているため、これらがスライド方向で係合することはなく、トリガー42を最大値まで抵抗なく引き込むことができる。モータ12を低速回転で維持する必要があるのは、ねじを締め付けるとき(すなわち、正方向に回転させるとき)のみであるため、上記のように逆方向に回転させる場合にはトリガー42の係合部材45と切換レバー44の係合部44cとを係合させずにトリガー42を操作する際の抵抗を小さくすることで、作業者の負担が軽減される。 On the other hand, when the switching lever 44 is placed in the reverse rotation position (see FIG. 5), the engaging surface 45a of the engaging member 45 and the engaging portion 44c of the switching lever 44 are misaligned in the width direction from the beginning. They do not engage in the sliding direction, and the trigger 42 can be pulled up to the maximum without resistance. Since the motor 12 needs to be maintained at low speed only when tightening the screw (i.e., when rotating in the forward direction), engagement of the trigger 42 is required for reverse rotation as described above. By reducing the resistance when operating the trigger 42 without engaging the member 45 and the engaging portion 44c of the switching lever 44, the burden on the operator is reduced.

本発明は上記の実施形態に限られない。以下、上記の実施形態と同様の点については重複説明を省略する。 The invention is not limited to the above embodiments. Duplicate descriptions of the same points as in the above-described embodiment will be omitted.

係合部材45の形状は上記に限らず、例えば図9に示すように、トリガー42の係止片42cを幅方向両側から抱え込む形状としてもよい。これにより、係合部材45をトリガー42に対してより強固に固定することができる。具体的に、この係合部材45は、係止片42cの幅方向一方側(図中下側)に設けられた第一部分45bと、係止片42cの幅方向他方側(図中上側)に設けられた第二部分45cと、第一部分45bと第二部分45cとを連結する第三部分45dとからなる。第一部分45bの本体側(図中右側)の端面45b1が、正回転位置に配された切換レバーの係合部44cと係合する係合面45aとして機能する。第二部分45cの本体側の端面45c1は、第一部分45bの本体側の端面45b1よりも幅方向寸法が小さい。これにより、第二部分45cの端面45c1は、逆回転位置に配された切換レバーの係合部44cと係合しないか、あるいは係合しても僅かにトリガー42が幅方向一方側にずれることで係合が解除されるようになっている。 The shape of the engaging member 45 is not limited to the above. Thereby, the engaging member 45 can be fixed to the trigger 42 more firmly. Specifically, the engaging member 45 includes a first portion 45b provided on one widthwise side (lower side in the drawing) of the locking piece 42c and a first portion 45b provided on the other widthwise side (upper side in the drawing) of the locking piece 42c. It consists of a second portion 45c provided and a third portion 45d connecting the first portion 45b and the second portion 45c. An end surface 45b1 of the first portion 45b on the main body side (right side in the drawing) functions as an engaging surface 45a that engages with the engaging portion 44c of the switching lever arranged in the forward rotation position. The body-side end surface 45c1 of the second portion 45c has a smaller width dimension than the body-side end surface 45b1 of the first portion 45b. As a result, the end surface 45c1 of the second portion 45c does not engage with the engaging portion 44c of the switching lever arranged in the reverse rotation position, or even if engaged, the trigger 42 is slightly displaced to one side in the width direction. , the engagement is released.

図10に示す実施形態では、係合部材45の係合面45aが、幅方向一方側(図中下側)に向けてトリガー42が後退する側(図中左側)に傾斜した傾斜面とされる。これにより、係合部材45の係合面45aに切換レバー44の係合部44cが係合したとき、係合部材45が幅方向他方側(図中上側)に移動しやすくなるため、係合を解除するために要するトリガー42の引き込み力が小さくなる。 In the embodiment shown in FIG. 10, the engaging surface 45a of the engaging member 45 is an inclined surface that is inclined toward the side (left side in the drawing) on which the trigger 42 retreats toward one side in the width direction (lower side in the drawing). be. Accordingly, when the engaging portion 44c of the switching lever 44 is engaged with the engaging surface 45a of the engaging member 45, the engaging member 45 is easily moved to the other side in the width direction (upper side in the drawing). The pull-in force of the trigger 42 required for releasing the is reduced.

以上の実施形態では、係合部材45とトリガー42とを別体の部材で構成した場合を示したが、例えばこれらを樹脂で一体に成形してもよい。あるいは、上記のような機能を有する係合部材を、本体側(例えばスイッチ本体41)に設け、トリガー42(例えば係止片42c)と係合させてもよい。 In the above embodiment, the case where the engaging member 45 and the trigger 42 are configured as separate members has been shown, but for example, these may be integrally molded with resin. Alternatively, an engaging member having the above functions may be provided on the main body side (for example, the switch main body 41) and engaged with the trigger 42 (for example, the locking piece 42c).

1 インパクトレンチ(回転工具)
10 本体
11 ケース
12 モータ
13 減速機構
14 打撃機構
15 制御部
20 バッテリー
30 ソケット
40 駆動スイッチ機構
41 スイッチ本体
41b スライド軸
42 トリガー(駆動スイッチ)
42c 係止片
43 切換スイッチ
44 切換レバー
44a レバー本体
44c 係合部
45 係合部材
45a 係合面(係合部)
1 impact wrench (rotary tool)
10 Body 11 Case 12 Motor 13 Reduction Mechanism 14 Impact Mechanism 15 Control Unit 20 Battery 30 Socket 40 Drive Switch Mechanism 41 Switch Body 41b Slide Shaft 42 Trigger (Drive Switch)
42c Locking piece 43 Switching switch 44 Switching lever 44a Lever main body 44c Engaging portion 45 Engaging member 45a Engaging surface (engaging portion)

Claims (3)

モータを有する本体と、前記本体に対してスライド可能に設けられ、スライド量に応じて前記モータの回転速度を変化させる駆動スイッチとを備えた回転工具であって、
前記駆動スイッチ及び前記本体に、前記駆動スイッチのスライド量を徐々に大きくして最大値よりも小さい所定値に達したときにスライド方向で互いに係合することで、前記モータの正方向の回転速度を所定速度で規制する係合部を設け
前記駆動スイッチの前記係合部と前記本体の前記係合部との係合を解除して、前記駆動スイッチのスライド量を前記所定値よりも大きくすることにより、前記モータの正方向の回転速度を前記所定速度よりも大きくすることが可能な回転工具。
A rotary tool comprising: a main body having a motor; and a drive switch slidably provided with respect to the main body for changing the rotation speed of the motor in accordance with a slide amount,
The driving switch and the main body are engaged with each other in the sliding direction when the sliding amount of the driving switch is gradually increased and reaches a predetermined value smaller than the maximum value, thereby increasing the forward rotational speed of the motor. provided with an engaging portion that regulates at a predetermined speed ,
By releasing the engagement between the engaging portion of the drive switch and the engaging portion of the main body and increasing the amount of sliding of the drive switch to be greater than the predetermined value, the rotational speed of the motor in the forward direction is increased. can be made higher than the predetermined speed .
前記本体に、前記モータの回転方向を切り換える切換レバーを設け、
前記切換レバーに、前記本体側の係合部を設けた請求項1に記載の回転工具。
A switching lever for switching the rotation direction of the motor is provided on the main body,
2. The rotary tool according to claim 1, wherein the switching lever is provided with an engaging portion on the main body side.
モータを有する本体と、前記本体に対してスライド可能に設けられ、スライド量に応じて前記モータの回転速度を変化させる駆動スイッチとを備えた回転工具の前記駆動スイッチに取り付けられる係合部材であって、
前記駆動スイッチのスライド量が最大値よりも小さい所定値に達したときに、前記本体に設けられた係合部とスライド方向で係合することで、前記モータの正方向の回転速度を所定速度で規制する係合部を有し、
前記駆動スイッチの前記係合部と前記本体の前記係合部との係合を解除して、前記駆動スイッチのスライド量を前記所定値よりも大きくすることにより、前記モータの正方向の回転速度を前記所定速度よりも大きくすることが可能な係合部材。
An engaging member attached to the drive switch of a rotary tool, comprising a main body having a motor, and a drive switch provided slidably with respect to the main body and changing the rotation speed of the motor according to the amount of sliding. hand,
When the amount of sliding of the drive switch reaches a predetermined value smaller than the maximum value , the forward rotation speed of the motor is increased to a predetermined speed by engaging with an engaging portion provided on the main body in the sliding direction. has an engaging portion that is regulated by
By releasing the engagement between the engaging portion of the drive switch and the engaging portion of the main body and increasing the amount of sliding of the drive switch to be greater than the predetermined value, the rotational speed of the motor in the forward direction is increased. is greater than the predetermined speed .
JP2018221276A 2018-11-27 2018-11-27 Rotary tool and engaging member provided therewith Active JP7153541B2 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007222983A (en) 2006-02-23 2007-09-06 Makita Corp Electric tool

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Publication number Priority date Publication date Assignee Title
JP2596294Y2 (en) * 1993-07-19 1999-06-07 リョービ株式会社 Electric tool

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007222983A (en) 2006-02-23 2007-09-06 Makita Corp Electric tool

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