JP2011029110A

JP2011029110A - Trigger switch

Info

Publication number: JP2011029110A
Application number: JP2009176225A
Authority: JP
Inventors: Isao Inagaki; 功稲垣
Original assignee: Satori S Tech Co Ltd
Current assignee: Satori S Tech Co Ltd
Priority date: 2009-07-29
Filing date: 2009-07-29
Publication date: 2011-02-10

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trigger switch which has a structure in which a case is extended to install a top wall so that moisture and dust may not enter, especially, in the rotation axle of a forward-reverse switching lever and further, which can prevent invasion of moisture and dust from the outside nearly completely by preventing the invasion of moisture and dust into a sliding operation part interlocked with a trigger lever by an outside packing. <P>SOLUTION: The trigger switch is provided with a switching operation part which is assembled at the upper position of a case and controls forward rotation and reverse rotation of a motor by the operation of the switching lever having a switching contact piece, and a sliding operation part which is assembled at the lower position of the case and controls so that a slider which slides together with a contactor installed in a slide circuit board may move interlocked with the operation of the trigger lever. The trigger switch is provided with a body part which corresponds to a connection portion of the switching lever arranged at the outside of the case and a top wall which is an aperture portion of a rotation axle housing chamber in which the rotation axle connected to the body part is rotatably incorporated and is formed by extending the case so as to cover the rotation axle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明はトリガースイッチに関し、詳しくは、ブラシレスモーター搭載電動工具等に使用されるトリガースイッチにおいて、正逆切替レバーの切替により水分及び埃が内部に浸入するのを防止する構造にすること及びトリガーレバーの引き込み動作で摺動する摺動操作部からの水分及び埃の浸入を防止する構造のトリガースイッチに関する。 The present invention relates to a trigger switch, and more particularly, in a trigger switch used for a brushless motor-equipped electric tool or the like, a structure that prevents moisture and dust from entering inside by switching a forward / reverse switching lever and a trigger lever The present invention relates to a trigger switch having a structure that prevents moisture and dust from entering from a sliding operation section that slides in a retraction operation.

従来技術における正逆切替レバーを備えたトリガースイッチは、図１０、図１１及び図１２に示すように、箱状に形成された内部に摺動接点機構を組み込み、外部のトリガーレバー１１からの摺動操作を伝達する摺動操作部１５（図１１参照）を備え、且つ側面を開口にしたケース１２と、ケース１２の側面の開口面を塞ぐと共に、内側側面に摺動回路基板１３を搭載したカバー１４と、手の指で操作できるトリガーレバー１１と、ケース１２の上部位置にモータの正逆回転を切替える切替操作部２５とを備えた構成になっている。 As shown in FIGS. 10, 11, and 12, a trigger switch having a forward / reverse switching lever in the prior art incorporates a sliding contact mechanism inside a box shape, and slides from an external trigger lever 11. A sliding operation portion 15 (see FIG. 11) for transmitting a dynamic operation is provided, the case 12 having an open side surface, the opening surface of the side surface of the case 12 is closed, and the sliding circuit board 13 is mounted on the inner side surface. The cover 14, the trigger lever 11 that can be operated with fingers of the hand, and a switching operation unit 25 that switches the forward / reverse rotation of the motor at the upper position of the case 12 are provided.

切替操作部２５は、ケース１２の上部位置に設けてある回動軸収納室２１に回動軸２９を収納し、隣接する接片部収納室２２に切替接片３１を装着した接片部３０を収納した構成となっている。 The switching operation unit 25 stores the rotation shaft 29 in the rotation shaft storage chamber 21 provided at the upper position of the case 12, and the contact piece portion 30 in which the switching contact piece 31 is mounted in the adjacent contact piece storage chamber 22. It has a configuration that accommodates.

切替レバー２６は、台形状に形成された本体部２７の上端部に上方向に突出形成した切替ノブ２８を備え、略中心位置に切替レバー２６が回動自在な中心軸となる回動軸２９、後端部の側面に切替の信号を発生させる導電性金属部材で形成された切替接片３１を装着する接片部３０を備え、先端部にオシボバネ３２とオシボ３３を備えた構成になっている。 The switching lever 26 includes a switching knob 28 that protrudes upward from an upper end portion of a main body 27 that is formed in a trapezoidal shape, and a rotation shaft 29 that serves as a central axis that allows the switching lever 26 to rotate at a substantially central position. It has a configuration in which a contact piece portion 30 for mounting a switching contact piece 31 formed of a conductive metal member that generates a switching signal is provided on the side face of the rear end portion, and a tip spring and a tip spring 32 and a tip 33 are provided. Yes.

回動軸収納室２２は、切替レバー２６を回動自在に収納するもので、回動軸２９を回動軸係合孔２３に係合させ、本体部２７を含む切替ノブ２８をケース１２の外に位置させ、切替接片３１を装着した接片部３０は接片部収納室２２内に配置される。
このとき、回動軸２９は回動軸係合孔２３に係合させたときに、回動軸の上面は外部に露出した状態で係合される。 The rotating shaft storage chamber 22 stores the switching lever 26 in a freely rotatable manner. The rotating shaft 29 is engaged with the rotating shaft engaging hole 23, and the switching knob 28 including the main body 27 is attached to the case 12. The contact piece 30 that is located outside and to which the switching contact piece 31 is attached is disposed in the contact piece storage chamber 22.
At this time, when the rotation shaft 29 is engaged with the rotation shaft engagement hole 23, the upper surface of the rotation shaft is engaged with the surface exposed to the outside.

摺動操作部１５は、棒状に形成し自由端部に、Ｏリング３８及び外部パッキン３９Ａを取付け、トリガーレバー１１を取り付けることができる摺動軸４１と、この摺動軸４１の基部側であって側面に平行に２つの摺動子４２、４３を配置してモータの回転速度を制御する速度制御部４４を設けた構造になっている。
摺動軸４１は、Ｏリング３８及び外部パッキン３９Ａを取り付け、その先端側をトリガーレバー１１に取り付け、Ｅリング５９を差し込むことでトリガーレバー１１から外れない構成になっている。 The sliding operation portion 15 is formed in a rod shape and has a free end portion to which an O-ring 38 and an external packing 39A are attached, and a trigger shaft 11 to which a trigger lever 11 can be attached, and a base side of the sliding shaft 41. In this structure, two sliders 42 and 43 are arranged in parallel to the side surface and a speed control unit 44 for controlling the rotational speed of the motor is provided.
The sliding shaft 41 has a configuration in which an O-ring 38 and an external packing 39A are attached, the tip side thereof is attached to the trigger lever 11, and the E-ring 59 is inserted so as not to be detached from the trigger lever 11.

外部パッキン３９Ａは、ゴム製部材で筒形状に形成され、予め伸縮したときに折り曲げる位置を特定するために、所謂、胴体部分がジャバラ状に形成され、その肉厚は全体として均一である。
このような構造の外部パッキン３９Ａは、図１３に示すように、摺動軸４１に自由端部側を取付け、基部側をパッキン係合部３７ａ（３７ｂ）に係合させる。そして、摺動軸４１の摺動動作に伴って、圧接されている自由端部側が動きジャバラ状の筒の部位の定まったジャバラ部位が縮まる。 The outer packing 39A is formed of a rubber member in a cylindrical shape, and a so-called body portion is formed in a bellows shape in order to specify a position where the outer packing 39A is previously expanded and contracted, and its thickness is uniform as a whole.
As shown in FIG. 13, the external packing 39 </ b> A having such a structure attaches the free end side to the sliding shaft 41 and engages the base side with the packing engaging portion 37 a (37 b). Then, as the sliding shaft 41 slides, the free end portion that is in pressure contact moves and the bellows portion where the bellows-shaped tube portion is determined is contracted.

図１４に示す外部パッキン３９Ｂは、変形例で、外部パッキン３９Ｂの肉厚が全て均一に筒形状に形成したものであり、摺動軸４１の摺動動作に伴って、圧接されている自由端部側が動き、筒の定まった部分が座屈する構造となっている。 The outer packing 39B shown in FIG. 14 is a modified example in which all the thickness of the outer packing 39B is uniformly formed in a cylindrical shape, and is in free contact with the sliding movement of the sliding shaft 41. The part side moves, and the fixed part of the tube is buckled.

速度制御部４４は、図１１に示すように、摺動軸４１に連結され、摺動軸４１に連動する速度制御摺動子４２及びスイッチ摺動子４３を備え、且つ速度制御摺動子４２及びスイッチ摺動子４３に弾性接触するための接触子４５、４６、４７、４８を備えた摺動回路基板１３とから大略構成されている。 As shown in FIG. 11, the speed control unit 44 includes a speed control slider 42 and a switch slider 43 that are connected to the slide shaft 41 and interlocked with the slide shaft 41, and the speed control slider 42. And a sliding circuit board 13 provided with contacts 45, 46, 47 and 48 for elastic contact with the switch slider 43.

摺動回路基板１３は、表面に切替操作部２５の切替接片３１と接触する切替接触子３４ａ、３４ｂと、速度制御部４４に備えてある摺動子４２、４３と摺動する接触子４５、４６、４７、４８を備えた構成になっている。
摺動回路基板１３に配設されている接触子４５、４６、４７、４８は、平行且つ整列状態で配設され、上部位置に帯状で抵抗体を構成する可変接触子４５、この可変接触子４５と平行で且つ同一長さに導電性部材で形成された摺動接触子４６、この摺動接触子４６と平行で且つ寸足らずの導電性部材で形成された制御接触子４７、この制御接触子４７と平行で且つ同一長さに導電性部材で形成された補助接触子４８からなる。 The sliding circuit board 13 has switching contacts 34 a and 34 b that contact the switching contact piece 31 of the switching operation unit 25 on the surface, and a contact 45 that slides with the sliding elements 42 and 43 provided in the speed control unit 44. , 46, 47, 48.
The contacts 45, 46, 47, 48 arranged on the sliding circuit board 13 are arranged in a parallel and aligned state, and the variable contact 45 that forms a resistor in a strip shape at the upper position, the variable contact 45, a sliding contact 46 formed of a conductive member in parallel with the same length, a control contact 47 formed of a conductive member parallel to the sliding contact 46 and not short of length, and the control contact 47 is formed of an auxiliary contact 48 formed of a conductive member in parallel with the same length.

このような構成の切替操作部２５においては、図１１に示すように、切替レバー２６の回動軸２９をケース１２の回動軸係合孔２３に係合させ、切替接片３１を摺動回路基板１３の切替接触子３４ａ、３４ｂに対向させた状態にしておき、切替ノブ２８の操作で切替接片３１が切替接触子３４ａ、３４ｂを導通状態にすることで、切替信号を発生させる。 In the switching operation unit 25 having such a configuration, as shown in FIG. 11, the rotation shaft 29 of the switching lever 26 is engaged with the rotation shaft engaging hole 23 of the case 12, and the switching contact piece 31 is slid. The switching contacts 31a and 34b of the circuit board 13 are kept facing each other, and the switching contact piece 31 makes the switching contacts 34a and 34b conductive by operating the switching knob 28, thereby generating a switching signal.

又、摺動回路基板１３に配設された接触子４５、４６、４７、４８に対して、摺動接触子４６及び可変接触子４５の両者にブラシが接触するように速度制御摺動子４２が当接されることで可変接触子４５の抵抗体を変化させることでモータへの回転制御を行う。
同時に、制御接触子４７及び補助接触子４８の両者にブラシが接触するようにスイッチ摺動子４３が当接されることで、補助スイッチとして機能する。 The speed control slider 42 is arranged so that the brush contacts both the sliding contact 46 and the variable contact 45 with respect to the contacts 45, 46, 47, 48 arranged on the sliding circuit board 13. Is controlled to rotate by changing the resistor of the variable contact 45.
At the same time, the switch slider 43 is brought into contact with the control contact 47 and the auxiliary contact 48 so that the brush comes in contact with each other, thereby functioning as an auxiliary switch.

このような構造をした速度制御部４４においては、摺動操作部１５が復帰バネ４９に抗してトリガーレバー１１で操作されると速度制御摺動子４２及びスイッチ摺動子４３が摺動回路基板１３の接触子４５、４６、４７、４８に接触する。 In the speed control unit 44 having such a structure, when the sliding operation unit 15 is operated by the trigger lever 11 against the return spring 49, the speed control slider 42 and the switch slider 43 are connected to the sliding circuit. Contact the contacts 45, 46, 47, 48 of the substrate 13.

特許出願２００７−２２２７００Patent application 2007-222700

しかしながら、従来技術で説明した正逆切替レバーを配置する切替操作部においては、ケースの回動軸収納室の回動軸係合孔に切替レバーの回動軸を係合させる構造においては、外部からの水分の浸入に対する防護手段が何らされていないために、切替レバーの回動軸あたりから切替レバーの切替により水分又は埃が内部に浸入し、その浸入した水分又は埃が摺動回路基板に配設されている接触子に伝播して誤動作を起こす起因になるという問題がある。
また、摺動操作部の摺動軸が外部に露出している部分に外部パッキンを被せているが、この外部パッキンの構造が摺動軸の動きに連動して同一位置のみが折れ曲がる構造であるために、破損し易い構造となっており、また、折れ曲がり時により大きなスペースが必要となりスペース上の制約も必要であるという問題もある。 However, in the switching operation portion in which the forward / reverse switching lever described in the prior art is disposed, the structure in which the rotation shaft of the switching lever is engaged with the rotation shaft engaging hole of the rotation shaft storage chamber of the case is external. Since there is no protective means against moisture intrusion from the water, moisture or dust enters the inside by switching the switching lever from around the rotation axis of the switching lever, and the intruded moisture or dust enters the sliding circuit board. There is a problem that it causes a malfunction by propagating to the arranged contacts.
Moreover, the external packing is put on the part where the sliding shaft of the sliding operation part is exposed to the outside, but the structure of this external packing is a structure in which only the same position is bent in conjunction with the movement of the sliding shaft. Therefore, it has a structure that is easily damaged, and there is a problem that a larger space is required at the time of bending and space restrictions are required.

従って、モータの正転及び逆転を切替える正逆切替スイッチにおいて、切替える際に発生する水分又は埃の浸入を防ぐ構造、及び摺動操作部の摺動軸を覆う外部パッキンの破損しずらい構造にして結果的に水分又は埃の浸入を防止することに解決しなければならない課題を有する。 Therefore, in the forward / reverse selector switch that switches between forward and reverse rotation of the motor, a structure that prevents the ingress of moisture or dust that occurs when switching, and a structure that does not easily damage the external packing that covers the sliding shaft of the sliding operation part. As a result, there is a problem to be solved in preventing the intrusion of moisture or dust.

上記課題を解決するために、本願発明のトリガースイッチは、次に示す構成にすることである。 In order to solve the above problems, the trigger switch of the present invention is configured as follows.

（１）トリガースイッチは、ケースの上部位置に組込まれており、切替接片を備えた切替レバーの操作によりモータの正転・逆転を制御する切替操作部と、ケースの下部位置に組込まれており、摺動回路基板に設けてある接触子と摺動する摺動子がトリガーレバーの操作に連動して動くように制御する摺動操作部と、を備えたトリガースイッチであって、前記ケースの外側に配置される切替レバーの連結部分に相当する本体部と、該本体部と連設した回動軸が回動自在に組込まれる回動軸収納室の開口部分であって前記回動軸を覆うように前記ケースを延設して形成された頂面壁を備えたことである。
（２）前記頂面壁は、前記ケースに連設して、前記回動軸の頂面に隣接したようにして覆う構造である（１）に記載のトリガースイッチ。
（３）前記摺動操作部に連結される摺動軸に被せるようにして配置した外部パッキンは、筒形状に形成し、その基部側の肉厚を厚く形成し、筒の部分の肉厚を前記基部側の肉厚よりも肉薄に形成して且つ均一な肉厚とし、自由端部側を内側に折り曲げたことを特徴とする（１）に記載のトリガースイッチ。 (1) The trigger switch is incorporated in the upper position of the case, and is incorporated in the switching operation section for controlling the forward / reverse rotation of the motor by the operation of the switching lever provided with the switching contact piece, and the lower position of the case. A sliding switch for controlling the sliding element and the sliding element provided on the sliding circuit board to move in conjunction with the operation of the trigger lever. A main body portion corresponding to a connecting portion of a switching lever disposed outside, and an opening portion of a rotation shaft storage chamber in which a rotation shaft connected to the main body portion is rotatably incorporated, and the rotation shaft A top wall formed by extending the case so as to cover the surface.
(2) The trigger switch according to (1), wherein the top wall is configured to be connected to the case so as to be adjacent to the top surface of the rotating shaft.
(3) The external packing arranged so as to cover the sliding shaft connected to the sliding operation portion is formed in a cylindrical shape, the thickness on the base side is increased, and the thickness of the cylindrical portion is increased. The trigger switch according to (1), wherein the trigger switch is formed so as to be thinner than the thickness on the base side and has a uniform thickness, and the free end side is bent inward.

本発明に係るトリガースイッチは、正逆切替レバーの特に回動軸のあたりに水分や埃が浸入しないようにケースを延設して頂面壁を設けたことにより、正逆切替レバーからの埃や水分の浸入を防ぐことができる。
又、切替レバーの部位からの水分の侵入を防ぐことに加えて、トリガーレバーに連動する摺動操作部への水分や埃の浸入も外部パッキンで防ぐようにしたことにより、略完全に外部からの水分及び埃の浸入を防止することができる。 The trigger switch according to the present invention has a top wall provided by extending the case so that moisture and dust do not enter around the rotation axis of the forward / reverse switching lever. Intrusion of moisture can be prevented.
Moreover, in addition to preventing moisture from entering from the switch lever part, moisture and dust are prevented from entering the sliding operation part linked to the trigger lever with the external packing, so that it is almost completely external. Intrusion of moisture and dust can be prevented.

本発明に係るトリガースイッチに頂面壁を設けた構造を示した斜視図である。It is the perspective view which showed the structure which provided the top wall in the trigger switch which concerns on this invention. 同、頂面図である。FIG. 同、側面図である。FIG. 同、トリガースイッチの内部構造を示した分解斜視図である。FIG. 2 is an exploded perspective view showing the internal structure of the trigger switch. 同、摺動回路基板の配置状態を示す平面図である。It is a top view which shows the arrangement | positioning state of a sliding circuit board equally. 同、頂面壁及び外部パッキンの部分を含んで内部構造を示す断面図である。It is sectional drawing which shows an internal structure including the part of a top wall and an external packing. 同、外部パッキンの平面図である。It is a top view of external packing similarly. 同、外部パッキンの断面図である。It is sectional drawing of an external packing same as the above. 同、外部パッキンの座屈状態を示す説明図である。It is explanatory drawing which shows the buckling state of external packing similarly. 従来技術におけるトリガースイッチの全体図を示す斜視図である。It is a perspective view which shows the whole trigger switch in a prior art. 同、トリガースイッチの内部構造を示した分解斜視図である。FIG. 2 is an exploded perspective view showing the internal structure of the trigger switch. 同、回動軸周囲及び外部パッキンの部分を含んだ内部構造を示す断面図である。It is sectional drawing which shows the internal structure including the part of the periphery of a rotating shaft and an external packing similarly. 同、外部パッキンの座屈状態を示す説明図である。It is explanatory drawing which shows the buckling state of external packing similarly. 同、他の例の外部パッキンの座屈状態を示す説明図である。It is explanatory drawing which shows the buckling state of the external packing of another example same as the above.

本願発明に係るトリガースイッチの実施形態について、図面を参照して説明する。 An embodiment of a trigger switch according to the present invention will be described with reference to the drawings.

本発明に係るトリガースイッチを備えた電動工具用スイッチは、図１乃至図６に示すように、箱状に形成された内部に摺動接点機構（速度制御部）を組み込み、外部のトリガーレバー１１からの摺動操作を伝達する摺動操作部１５（図４参照）を備え、且つ側面を開口にしたケース１２と、ケース１２の側面の開口面を塞ぐと共に、内側側面に摺動回路基板１３を搭載したカバー１４と、手の指で操作できるトリガーレバー１１と、ケース１２の上部位置にモータの正逆回転を切替える切替操作部２５と、を備えた構成になっている。 As shown in FIGS. 1 to 6, the power tool switch including the trigger switch according to the present invention incorporates a sliding contact mechanism (speed control unit) inside a box shape, and an external trigger lever 11. The case 12 having a sliding operation portion 15 (see FIG. 4) for transmitting the sliding operation from the side, the side surface of the case 12 being open, the side surface of the case 12 being closed, and the inner side surface of the sliding circuit board 13 are closed. , A trigger lever 11 that can be operated with a finger of a hand, and a switching operation unit 25 that switches forward / reverse rotation of the motor to an upper position of the case 12.

ケース１２は、側面を開口にした箱型形状に形成し、図４において、手前側にトリガーレバー１１をガイドするための上部位置に設けた上部レバーガイド部１７及びこの上部レバーガイド部１７と同じ形状であって鉛直方向の下部位置に設けた下部レバーガイド部１８を設け、内部においては上部レバーガイド部１７と下部レバーガイド部１８とで挟まれた奥行き方向に摺動操作部１５を形成する速度制御部４４を収納する速度制御部収納室１９、速度制御部収納室１９の上部位置に切替操作部２５を構成する切替レバー２６のうち回動軸２９を回動軸係合孔２３に組み合わせて収納する回動軸収納室２１、この回動軸収納室２１に遮蔽部材を介して連続して設けた切替操作部２５を構成する切替レバーのうち接片部３０を収納する接片部収納室２２からなる。 The case 12 is formed in a box shape with an open side, and is the same as the upper lever guide portion 17 provided at the upper position for guiding the trigger lever 11 on the front side in FIG. A lower lever guide portion 18 having a shape and provided at a lower position in the vertical direction is provided, and a sliding operation portion 15 is formed in a depth direction sandwiched between the upper lever guide portion 17 and the lower lever guide portion 18 inside. The rotation shaft 29 is combined with the rotation shaft engaging hole 23 among the speed control unit storage chamber 19 for storing the speed control unit 44 and the switching lever 26 constituting the switching operation unit 25 at the upper position of the speed control unit storage chamber 19. The rotary shaft storage chamber 21 that stores the contact piece 30 of the switching lever that constitutes the switching operation portion 25 that is continuously provided in the rotary shaft storage chamber 21 via the shielding member. Made from the chamber 22.

カバー１４は、図４及び図５に示すように、内側側面壁に長方形状の摺動回路基板１３を装着する基板装着部２４を備えた構成になっている。 As shown in FIGS. 4 and 5, the cover 14 includes a board mounting portion 24 that mounts the rectangular sliding circuit board 13 on the inner side wall.

切替操作部２５を構成する切替レバー２６は、図４に示すように、台形状に形成された本体部２７の上端部に上方向に突出形成した切替ノブ２８を備え、略中心位置に切替レバー２６が回動自在な中心軸となる回動軸２９、後端部の側面に切替の信号を発生させる導電性金属部材で形成された切替接片３１を装着する接片部３０を備え、後端部にオシボバネ３２とオシボ３３を備えた構成になっている。 As shown in FIG. 4, the switching lever 26 constituting the switching operation unit 25 includes a switching knob 28 that protrudes upward from the upper end portion of a main body 27 formed in a trapezoidal shape, and is substantially at the center position. 26 includes a rotating shaft 29 serving as a pivotable central axis, and a contact piece portion 30 for mounting a switching contact piece 31 formed of a conductive metal member that generates a switching signal on the side surface of the rear end portion. It has a configuration in which an end spring 32 and an end support 33 are provided.

回動軸収納室２１は、切替レバー２６の回動軸２９を回動軸係合孔２３に係合させる部屋であって、回動軸２９よりも一段高く形成された本体部２７及び本体部２７に連設されている切替レバー２６をケース１２の外に位置させる。
そして、回動軸収納室２１内に形成された回動軸係合孔２３の上部を回動軸２９が係合したときにその回動軸２９の頂面を塞ぐように延設して形成した頂面壁３６を備えた構造となっている。 The rotating shaft storage chamber 21 is a chamber in which the rotating shaft 29 of the switching lever 26 is engaged with the rotating shaft engaging hole 23, and a main body portion 27 and a main body portion that are formed one step higher than the rotating shaft 29. The switching lever 26 connected to 27 is positioned outside the case 12.
The upper portion of the rotation shaft engaging hole 23 formed in the rotation shaft storage chamber 21 is extended and formed so as to close the top surface of the rotation shaft 29 when the rotation shaft 29 is engaged. The top wall 36 has a structure.

このように、頂面壁３６は、ケース１２に連設して、回動軸２９の頂面に隣接したようにして覆う構造となっており、これは回動軸２９を回動軸係合孔２３に係合したときに回動軸２９の頂面を外部から略覆うようにしたことで、外部から浸入する水分及び埃を頂面壁３６で遮ることが可能となる。 As described above, the top wall 36 is connected to the case 12 so as to cover the top surface of the rotating shaft 29 so as to cover the rotating shaft 29. Since the top surface of the rotating shaft 29 is substantially covered from the outside when engaged with the head 23, the top wall 36 can block moisture and dust entering from the outside.

接片部収納室２２は、切替レバー２６の切替接片３１を備えた接片部３０を収納する部屋であって、この部屋の中で切替接片３１がカバー１４に装着されている摺動回路基板１３に配設されている切替接触子３４ａ、３４ｂと対向させた状態に配置され、切替ノブ２８の操作により切替接片３１が切替接触子３４ａ、３４ｂに接触する。 The contact piece storage chamber 22 is a room for storing the contact piece portion 30 including the switching contact piece 31 of the switching lever 26, and the sliding portion 31 is mounted on the cover 14 in this room. It arrange | positions in the state facing the switching contacts 34a and 34b arrange | positioned at the circuit board 13, and the switching contact piece 31 contacts the switching contacts 34a and 34b by operation of the switching knob 28. FIG.

摺動操作部１５は、棒状に形成し自由端部に、Ｏリング３８及び外部パッキン３９を取付け、トリガーレバー１１を取り付けることができる摺動軸４１と、この摺動軸４１の基部側であって側面に平行に２つの摺動子４２、４３を配置してモータの回転速度を制御する速度制御部４４を設けた構造になっている。 The sliding operation portion 15 is formed in a rod shape and has a free end portion to which an O-ring 38 and an external packing 39 are attached, and a trigger shaft 11 to which a trigger lever 11 can be attached, and a base side of the sliding shaft 41. In this structure, two sliders 42 and 43 are arranged in parallel to the side surface and a speed control unit 44 for controlling the rotational speed of the motor is provided.

摺動軸４１は、Ｏリング３８及び外部パッキン３９を取付け、その先端側をトリガーレバー１１に取付け、Ｅリング５９を差し込むことでトリガーレバー１１から外れない構成になっている。 The sliding shaft 41 has a configuration in which an O-ring 38 and an external packing 39 are attached, a tip end side thereof is attached to the trigger lever 11, and an E-ring 59 is inserted so as not to be detached from the trigger lever 11.

外部パッキン３９は、図４、図６、図７及び図８に示すように、ゴム製で筒形状に形成され、その基部側の肉厚が厚く形成し、筒の部分の肉厚を基部側の肉厚よりも肉薄に形成し且つ均一な肉厚とし、自由端部側を内側に折り曲げた部位の肉厚を筒の部分の肉厚よりも厚く形成した構造となっている。具体的な寸法で示すと、筒形状の外径が９.８ｍｍ、基部側の内径が７．９ｍｍ、自由端部側の折り曲げた内径が５．８ｍｍ、折り曲げた部位の一つ目の肉厚が０．３ｍｍ、折り曲げた部位の二つ目の肉厚が０．５ｍｍ、筒の部位の肉厚が０．４ｍｍ、基部側の肉厚が０．９５ｍｍとなっている。 As shown in FIGS. 4, 6, 7 and 8, the outer packing 39 is made of rubber and is formed into a cylindrical shape, and the thickness of the base side is increased, and the thickness of the cylindrical portion is set to the base side. In this structure, the thickness is formed to be thinner than the wall thickness and uniform, and the thickness of the portion where the free end portion is bent inward is thicker than the thickness of the tube portion. Specifically, the outer diameter of the cylindrical shape is 9.8 mm, the inner diameter on the base side is 7.9 mm, the inner diameter folded on the free end side is 5.8 mm, and the first thickness of the bent part 0.3 mm, the second thickness of the bent portion is 0.5 mm, the thickness of the cylindrical portion is 0.4 mm, and the thickness on the base side is 0.95 mm.

このような構造の外部パッキン３９においては、図６に示すように、基部側をパッキン係合部３７ａ（３７ｂ）に係合させ、自由端部の折り曲げた部位を摺動軸４１に圧入させて係合させることで装着は完了し、トリガーレバー１１を押し込んだときにトリガーレバー１１の摺動軸４１を押し込んだときに、外部パッキン３９は、図９に示すように、座屈する状態がトリガーレバー１１で押し込む毎に異なる形状となる。これは、筒の部分が比較的肉薄に形成し、その基部側と自由端部側の肉厚が筒の部分の肉厚に比べて厚く形成したこと、及び自由端部側の折り曲げたアール形状の部位及び折り曲げた自由端部縁の肉厚を筒の部位の肉厚に比べて厚く形成したことと、折り曲げた部位での摺動軸４１への当接がしっかりした形状とすることで、座屈する部位が筒の部分に集約され、且つ筒の部位の肉厚は均一なものであるために、座屈するときにも筒の部位であればどの部分であっても座屈し易いようにしたことであり、また、折り曲がる為座屈時のスペースも大きくならずスペース上の制約も小さくなる利点がある。 In the external packing 39 having such a structure, as shown in FIG. 6, the base side is engaged with the packing engaging portion 37a (37b), and the bent portion of the free end portion is press-fitted into the sliding shaft 41. When the trigger lever 11 is pushed in and the sliding shaft 41 of the trigger lever 11 is pushed in, the external packing 39 is in a buckled state as shown in FIG. Each time it is pushed in 11, the shape changes. This is because the tube part is formed to be relatively thin, and the base side and free end side are thicker than the tube part, and the free end side is bent rounded. By forming the thickness of the part and the bent free end edge thicker than the thickness of the cylinder part, and making the contact with the sliding shaft 41 in the bent part a firm shape, Since the parts to be buckled are concentrated on the cylinder part and the thickness of the part of the cylinder is uniform, it is easy to buckle any part of the cylinder even when buckling. In addition, since it bends, there is an advantage that the space at the time of buckling is not increased and the restriction on the space is reduced.

速度制御部４４は、図４に示すように、摺動軸４１に連結され、摺動軸４１に連動する速度制御摺動子４２及びスイッチ摺動子４３を備え、且つ速度制御摺動子４２及びスイッチ摺動子４３に弾性接触するための接触子４５、４６、４７、４８を備えた摺動回路基板１３とから大略構成されている。 As shown in FIG. 4, the speed control unit 44 includes a speed control slider 42 and a switch slider 43 that are coupled to the slide shaft 41 and interlocked with the slide shaft 41, and the speed control slider 42. And a sliding circuit board 13 provided with contacts 45, 46, 47 and 48 for elastic contact with the switch slider 43.

摺動回路基板１３は、表面に切替操作部２５の切替接片３１と接触する切替接触子３４ａ、３４ｂと、速度制御部４４に備えてある摺動子４２、４３と摺動する接触子４５、４６、４７、４８を備えた構成になっている。 The sliding circuit board 13 has switching contacts 34 a and 34 b that contact the switching contact piece 31 of the switching operation unit 25 on the surface, and a contact 45 that slides with the sliding elements 42 and 43 provided in the speed control unit 44. , 46, 47, 48.

摺動回路基板１３に配設されている接触子４５、４６、４７、４８は、平行且つ整列状態で配設され、上部位置に帯状で抵抗体を構成する可変接触子４５、この可変接触子４５と平行で且つ同一長さに導電性部材で形成された摺動接触子４６、この摺動接触子４６と平行で且つ寸足らずの導電性部材で形成された制御接触子４７、この制御接触子４７と平行で且つ同一長さに導電性部材で形成された補助接触子４８からなる。 The contacts 45, 46, 47, 48 arranged on the sliding circuit board 13 are arranged in a parallel and aligned state, and the variable contact 45 that forms a resistor in a strip shape at the upper position, the variable contact 45, a sliding contact 46 formed of a conductive member in parallel with the same length, a control contact 47 formed of a conductive member parallel to the sliding contact 46 and not short of length, and the control contact 47 is formed of an auxiliary contact 48 formed of a conductive member in parallel with the same length.

このような構成の切替操作部２５においては、切替レバー２６の回動軸２９をケース１２の回動軸係合孔２３に係合させ、切替接片３１を摺動回路基板１３の切替接触子３４ａ、３４ｂに対向させた状態にしておき、切替ノブ２８の操作で切替接片３１が切替接触子３４ａ、３４ｂを導通状態にすることで、切替信号を発生させる。 In the switching operation unit 25 having such a configuration, the rotation shaft 29 of the switching lever 26 is engaged with the rotation shaft engaging hole 23 of the case 12, and the switching contact piece 31 is connected to the switching contact of the sliding circuit board 13. The switching contact piece 31 makes the switching contacts 34a and 34b conductive by operating the switching knob 28, and a switching signal is generated.

このような構造をした速度制御部４４においては、摺動操作部１５が復帰バネ４９に抗してトリガーレバー１１で操作されると速度制御摺動子４２及びスイッチ摺動子４３が摺動回路基板１３の接触子４５、４６、４７、４８に接触して摺動する。 In the speed control unit 44 having such a structure, when the sliding operation unit 15 is operated by the trigger lever 11 against the return spring 49, the speed control slider 42 and the switch slider 43 are connected to the sliding circuit. It slides in contact with the contacts 45, 46, 47, 48 of the substrate 13.

さて、本願発明の防塵・防滴手段としての頂面壁３６を設けた構造にすると、切替レバー２６の回動軸２９を頂面壁３６で覆うことができる。そのため、回動軸２９を係合する回動軸収納室２１が外部と略塞がった状態とすることができるため、外部からの埃や水滴の浸入を阻止することができるのである。 Now, with the structure provided with the top wall 36 as the dustproof / dripproof means of the present invention, the rotation shaft 29 of the switching lever 26 can be covered with the top wall 36. Therefore, the rotation shaft storage chamber 21 that engages with the rotation shaft 29 can be in a state of being substantially closed with the outside, so that entry of dust and water droplets from the outside can be prevented.

また、本願発明の外部パッキンを設ける構造にすると、肉厚の基部側でパッキン係合部３７ａ（３７ｂ）に係合し、自由端部の内側に折り曲げた部位で摺動軸４１に当接した状態となるため、摺動軸４１を出し入れする挿入口の部分を外部パッキン３９で封止することができる。そのため、摺動軸４１の摺動に伴っても外部からの埃や水滴の浸入を外部パッキン３９で完全に封止することができる。加えて、図９に示すように、外部パッキン３９の構造が、円筒形状に形成した筒の部分の肉厚が薄く、基部側の肉厚を厚く形成したことで、外部パッキンの座屈状態が全体として緩やかな形状に変形させることができる。そのため、例え座屈変形することが繰り返し行われても、一部に過度な変形が生じないために、破損等の破れを回避することができ、より長期に亘って防塵、防滴を維持することができるのである。 Further, in the structure of providing the external packing according to the present invention, it engages with the packing engaging portion 37a (37b) on the thick base portion side, and comes into contact with the sliding shaft 41 at the portion bent inside the free end portion. Therefore, the portion of the insertion opening through which the sliding shaft 41 is taken in and out can be sealed with the external packing 39. Therefore, even when the sliding shaft 41 slides, the entry of dust and water droplets from the outside can be completely sealed with the external packing 39. In addition, as shown in FIG. 9, the outer packing 39 has a structure in which the cylindrical portion formed in the cylindrical portion is thin and the base portion is thick, so that the buckling state of the outer packing is reduced. It can be deformed into a gentle shape as a whole. Therefore, even if buckling deformation is repeated, excessive deformation does not occur in part, so that breakage such as breakage can be avoided, and dustproofing and dripproofing are maintained for a longer period of time. It can be done.

正逆切替レバーの特に回動軸のあたりに水滴や埃が浸入しないように壁を設け、また摺動軸の出入口に基端部が肉厚で筒の部分が肉薄の外部パッキンを装着することで摺動軸を伝って容易に埃や水滴の浸入を防止できるトリガースイッチを提供する。 Provide a wall so that water droplets and dust do not enter the forward / reverse switching lever, especially around the rotating shaft, and attach an external packing with a thick base end and a thin cylindrical portion at the entrance / exit of the sliding shaft. A trigger switch that can easily prevent dust and water droplets from entering along a sliding shaft.

１１トリガーレバー
１２ケース
１３摺動回路基板
１４カバー
１５摺動操作部
１７上部レバーガイド部
１８下部レバーガイド部
１９速度制御部収納室
２１回動軸収納室
２２接片部収納室
２３回動軸係合孔
２４基板装着部
２５切替操作部
２６切替レバー
２７本体部
２８切替ノブ
２９回動軸
３０接片部
３１切替接片
３２オシボバネ
３３オシボ
３４ａ切替接触子
３４ｂ切替接触子
３６頂面壁
３７ａパッキン係合部
３７ｂパッキン係合部
３８Ｏリング
３９外部パッキン
３９Ａ外部パッキン
３９Ｂ外部パッキン
４１摺動軸
４２速度制御摺動子
４３スイッチ摺動子
４４速度制御部
４５可変接触子
４６摺動接触子
４７制御接触子
４８補助接触子
４９復帰バネ
５９Ｅリング DESCRIPTION OF SYMBOLS 11 Trigger lever 12 Case 13 Sliding circuit board 14 Cover 15 Sliding operation part 17 Upper lever guide part 18 Lower lever guide part 19 Speed control part storage chamber 21 Rotating shaft storage chamber 22 Contact part storage chamber 23 Rotating shaft mechanism Joint hole 24 Substrate mounting portion 25 Switching operation portion 26 Switching lever 27 Main body portion 28 Switching knob 29 Rotating shaft 30 Contacting portion 31 Switching contact piece 32 Oshibo spring 33 Oshibo 34a Switching contact 34b Switching contact 36 Top wall 37a Packing engagement Portion 37b Packing engagement portion 38 O-ring 39 External packing 39A External packing 39B External packing 41 Slide shaft 42 Speed control slider 43 Switch slider 44 Speed control unit 45 Variable contact 46 Slide contact 47 Control contact 48 Auxiliary contact 49 Return spring 59 E-ring

Claims

ケースの上部位置に組込まれており、切替接片を備えた切替レバーの操作によりモータの正転・逆転を制御する切替操作部と、
ケースの下部位置に組込まれており、摺動回路基板に設けてある接触子と摺動する摺動子がトリガーレバーの操作に連動して動くように制御する摺動操作部と、
を備えたトリガースイッチであって、
前記ケースの外側に配置される切替レバーの連結部分に相当する本体部と、該本体部と連設した回動軸が回動自在に組込まれる回動軸収納室の開口部分であって前記回動軸を覆うように前記ケースを延設して形成された頂面壁を備えたことを特徴とするトリガースイッチ。 A switching operation unit that is incorporated in the upper position of the case, and controls forward / reverse rotation of the motor by operating a switching lever equipped with a switching contact piece,
A sliding operation unit that is incorporated in a lower position of the case, and controls the sliding element and the sliding element that are provided on the sliding circuit board to move in conjunction with the operation of the trigger lever;
A trigger switch with
A main body portion corresponding to a connecting portion of a switching lever disposed outside the case, and an opening portion of a rotating shaft storage chamber into which a rotating shaft connected to the main body portion is rotatably incorporated. A trigger switch comprising a top wall formed by extending the case so as to cover a moving shaft.

前記頂面壁は、前記ケースに連設して、前記回動軸の頂面に隣接したようにして覆う構造である請求項１に記載のトリガースイッチ。 2. The trigger switch according to claim 1, wherein the top wall is configured to cover the case so as to be adjacent to the top surface of the rotating shaft.

前記摺動操作部に連結される摺動軸に被せるようにして配置した外部パッキンは、筒形状に形成し、その基部側の肉厚を厚く形成し、筒の部分の肉厚を前記基部側の肉厚よりも肉薄に形成して且つ均一な肉厚とし、自由端部側を内側に折り曲げたことを特徴とする請求項１に記載のトリガースイッチ。 The outer packing arranged so as to cover the sliding shaft connected to the sliding operation portion is formed in a cylindrical shape, and the thickness of the base side is increased, and the thickness of the cylindrical portion is set to the base side The trigger switch according to claim 1, wherein the trigger switch is formed so as to be thinner than the wall thickness and has a uniform wall thickness, and the free end portion is bent inward.