JP2013161683A - Breaker, safety circuit provided with the same, and secondary battery - Google Patents

Breaker, safety circuit provided with the same, and secondary battery Download PDF

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JP2013161683A
JP2013161683A JP2012023316A JP2012023316A JP2013161683A JP 2013161683 A JP2013161683 A JP 2013161683A JP 2012023316 A JP2012023316 A JP 2012023316A JP 2012023316 A JP2012023316 A JP 2012023316A JP 2013161683 A JP2013161683 A JP 2013161683A
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movable piece
case
rib
contact
resin base
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JP5937835B2 (en
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Katsufumi Namikawa
勝史 浪川
Nobuyuki Nakano
信幸 中野
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Komatsulite Manufacturing Co Ltd
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Komatsulite Manufacturing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To suppress failures such as corrosion, defective operation, and the like of a thermally-actuated element and a movable piece even under bad conditions by enhancing sealability of a case, in a breaker used as a protection device of a secondary battery or the like.SOLUTION: A resin base 71 comprises: a housing part 73 housing a thermally-actuated element 5; and a contact part 74 which is provided outside the housing part 73 and is in contact with a rear surface of a movable piece 4 between an elastic part 43 and a terminal 41 of the movable piece 4. A cover member 72 mounted on the resin base 71 includes a contact part 79 being in contact with a front surface of the movable piece 4 and holding the movable piece 4. A first rib 77a protruding to the side of the movable piece 4 is formed in the contact part 79. The first rib 77a closes a gap between the movable piece 4 and the contact part 79 to enhance sealability of the case 7.

Description

本発明は、電気機器の２次電池パック等に内蔵される小型のブレーカーに関するものである。   The present invention relates to a small breaker built in a secondary battery pack or the like of an electric device.

従来、各種電気機器の２次電池やモーター等の保護装置としてブレーカーが使用されている（図９及び図１０参照）。ブレーカーは、充放電中の２次電池の温度が過度に上昇した場合、又は自動車、家電製品等の機器に装備されるモーター等に過電流が流れた場合等の異常が生じた際に、２次電池やモーター等を保護するために電流を遮断する。このような保護装置として用いられるブレーカーは、機器の安全を確保するために、温度変化に追従して正確に動作することと、通電時の抵抗値が安定していることが求められる。   Conventionally, a breaker has been used as a protection device for secondary batteries and motors of various electric devices (see FIGS. 9 and 10). When the temperature of the secondary battery during charging / discharging rises excessively, or when an abnormality occurs such as when an overcurrent flows through a motor or the like equipped in a device such as an automobile or home appliance, Cut off current to protect secondary batteries and motors. A breaker used as such a protection device is required to operate accurately following a change in temperature and have a stable resistance value when energized in order to ensure the safety of the device.

また、ブレーカーが、ノート型パーソナルコンピュータ、タブレット型携帯情報端末機器又はスマートフォンと称される薄型の多機能携帯電話機等の電気機器に装備される２次電池等の保護装置として用いられる場合、上述した安全性の確保に加えて、小型化が要求される。特に、近年の携帯情報端末機器にあっては、ユーザーの小型化（薄型化）の志向が強く、各社から新規に発売される機器は、デザイン上の優位性を確保するために、小型に設計される傾向が顕著である。こうした背景の下、携帯情報端末機器を構成する一部品として、２次電池と共に実装されるブレーカーもまた、さらなる小型化が強く要求されている。   In addition, when the breaker is used as a protection device for a secondary battery or the like installed in an electric device such as a thin-type multifunctional mobile phone called a notebook personal computer, a tablet-type portable information terminal device, or a smartphone, the above-described case is used. In addition to ensuring safety, miniaturization is required. In particular, in recent portable information terminal devices, users have a strong desire for miniaturization (thinning), and devices newly released by each company are designed to be small in order to ensure superiority in design. The tendency to be remarkable is remarkable. Against this background, breakers that are mounted together with secondary batteries as one component of portable information terminal devices are also strongly required to be further miniaturized.

ブレーカーには、温度変化に応じて動作し、電流を導通又は遮断する熱応動素子が備えられている。特許文献１には、熱応動素子としてバイメタルを適用したブレーカーが示されている。バイメタルとは、熱膨張率の異なる２種類の板状の金属材料が積層されてなり、温度変化に応じて形状を変えることにより、接点の導通状態を制御する素子である。同文献に示されたブレーカーは、固定片（ベースターミナル）、可動片（可動アーム）、熱応動素子、ＰＴＣサーミスター等の部品が、ケースに収容されてなり、固定片及び可動片の端子が電気機器の電気回路に接続されて使用される。   The breaker is provided with a thermally responsive element that operates according to a temperature change and conducts or cuts off a current. Patent Document 1 discloses a breaker to which a bimetal is applied as a thermally responsive element. Bimetal is an element that is formed by laminating two types of plate-like metal materials having different coefficients of thermal expansion, and controls the conduction state of the contact by changing the shape in accordance with a temperature change. The circuit breaker shown in the same document includes a fixed piece (base terminal), a movable piece (movable arm), a thermally responsive element, a PTC thermistor and the like housed in a case. Used by connecting to the electrical circuit of electrical equipment.

ＷＯ２０１１−１０５１７５号公報WO2011-105175

上記特許文献１に示されたブレーカーにおいては、可動片の端子がケースの外部に露出されて外部回路に接続される。ケース本体と蓋部材によって構成されるケースには、可動片の端子をケースの外部に露出させるための開口が設けられている。開口の形状は、可動片の第２弾性部に対して相似形に形成されているが、その構造上不可避的に、開口の内壁と可動片との間に隙間が生じ、ケースの密閉性が低下する。その結果、悪条件下でケースの内部に異物が混入すると、熱応動素子及び可動片に腐食が生じたり、動作不良に陥るなどの虞がある。   In the breaker disclosed in Patent Document 1, the terminal of the movable piece is exposed to the outside of the case and connected to an external circuit. An opening for exposing the terminal of the movable piece to the outside of the case is provided in the case constituted by the case body and the lid member. The shape of the opening is similar to that of the second elastic portion of the movable piece, but inevitably due to its structure, a gap is formed between the inner wall of the opening and the movable piece, and the case is sealed. descend. As a result, if foreign matter is mixed inside the case under adverse conditions, there is a risk that the thermally responsive element and the movable piece may be corroded or malfunctioned.

本発明は、上記課題を解決するためになされたものであり、ケースの密閉性を高めて、熱応動素子、可動片の腐食や動作不良などの不具合を抑制できるブレーカーを提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and has an object to provide a breaker that can improve the sealing performance of a case and suppress problems such as corrosion and malfunction of a thermally responsive element and a movable piece. To do.

上記目的を達成するために、本発明のブレーカーは、固定接点を有する固定片と、弾性変形する弾性部と該弾性部の先端部に可動接点とを有し、前記可動接点を前記固定接点に押圧して接触させる可動片と、温度変化に伴って変形することにより前記可動接点が前記固定接点から離反するように前記可動片を作動させる熱応動素子と、前記固定片、可動片及び熱応動素子を収容するケースとを備えたブレーカーにおいて、前記可動片は、前記ケースの外部に露出されて外部回路と電気的に接続される端子を有し、前記ケースは、前記熱応動素子を収容する収容部と、前記収容部の外側に設けられ、前記弾性部と前記端子との間において前記可動片と当接して該可動片を保持する当接部を有し、前記当接部には、前記可動片の側に突出する突出部が形成されているものである。   In order to achieve the above object, a breaker according to the present invention includes a fixed piece having a fixed contact, an elastic portion that is elastically deformed, and a movable contact at a tip of the elastic portion, and the movable contact is used as the fixed contact. A movable piece that is pressed and brought into contact; a thermally responsive element that operates the movable piece so that the movable contact is separated from the fixed contact by being deformed as the temperature changes; and the fixed piece, the movable piece, and the thermal responsive element In a breaker including a case for accommodating an element, the movable piece has a terminal exposed to the outside of the case and electrically connected to an external circuit, and the case accommodates the thermally responsive element. A housing portion; and a contact portion that is provided outside the housing portion and holds the movable piece in contact with the movable piece between the elastic portion and the terminal. Projection projecting to the movable piece side In which There are formed.

この発明において、前記可動片は、板状材料から形成され、前記ケースは、前記可動接点が形成されている前記可動片の裏面側に配設され、前記収容部が形成された第１ケースと、前記可動片の表面側に配設され、前記第１ケースに装着される第２ケースとを有し、前記第１ケース又は第２ケースのうちの少なくとも一方は、前記可動片の裏面又は表面に当接する第１突出部を有することが好ましい。   In this invention, the movable piece is formed of a plate-like material, the case is disposed on the back side of the movable piece on which the movable contact is formed, and the first case in which the housing portion is formed. And a second case disposed on the surface side of the movable piece and attached to the first case, wherein at least one of the first case or the second case is a back surface or a surface of the movable piece It is preferable to have the 1st protrusion part which contact | abuts.

この発明において、前記第１ケース又は第２ケースのうちの他方は、前記可動片の側面に当接する第２突出部を有することが好ましい。   In this invention, it is preferable that the other of the first case or the second case has a second projecting portion that contacts the side surface of the movable piece.

この発明において、前記第１突出部の稜線と前記第２突出部の稜線とは、少なくとも一部において同一平面上に配設されていることが好ましい。   In this invention, it is preferable that the ridge line of the first protrusion and the ridge line of the second protrusion are arranged on the same plane at least in part.

この発明において、前記第１ケース又は第２ケースのうちの一方は、前記他方の第２突出部に当接する第３突出部を有することが好ましい。   In this invention, it is preferable that one of the first case and the second case has a third protrusion that abuts against the other second protrusion.

この発明において、前記第３突出部は、前記第２突出部に対して、前記可動片の弾性部の側又は端子の側に配設されていることが好ましい。   In this invention, it is preferable that the 3rd protrusion part is arrange | positioned with respect to the 2nd protrusion part at the elastic part side or the terminal side of the movable piece.

この発明において、前記可動片は、前記第１突出部及び／又は前記第２突出部に対応する凹部を有することが好ましい。   In this invention, it is preferable that the movable piece has a recess corresponding to the first protrusion and / or the second protrusion.

また、本発明の電気機器用の安全回路は、前記ブレーカーを備えたことを特徴とする。   In addition, a safety circuit for an electric device according to the present invention includes the breaker.

また、本発明の２次電池パックは、前記ブレーカーを備えたことを特徴とする。   In addition, a secondary battery pack according to the present invention includes the breaker.

本発明のブレーカーによれば、可動片と当接して可動片を保持する当接部に形成されている突出部によって、可動片とケースの当接部との間の微小な隙間を塞ぐことができ、これにより、ケースの密閉性を向上させて、熱応動素子、可動片の腐食や動作不良などの不具合を抑制することができる。   According to the breaker of the present invention, the minute gap between the movable piece and the contact portion of the case can be blocked by the protrusion formed on the contact portion that contacts the movable piece and holds the movable piece. Thus, the sealing property of the case can be improved, and problems such as corrosion and malfunction of the thermally responsive element and the movable piece can be suppressed.

また、第１ケース又は第２ケースのうちの少なくとも一方が、可動片の裏面又は表面に当接する第１突出部を有する形態によれば、可動片の裏面又は表面と第１ケース又は第２ケースの当接部との間の隙間を塞ぐことができ、ケースの密閉性をより一層向上させることができる。   Moreover, according to the form in which at least one of the first case or the second case has the first protrusion that contacts the back surface or the front surface of the movable piece, the back surface or the front surface of the movable piece and the first case or the second case. The gap between the contact portion and the contact portion of the case can be closed, and the sealing performance of the case can be further improved.

また、第１ケース又は第２ケースのうちの他方が可動片の側面に当接する第２突出部を有する形態によれば、可動片の側面と第１ケース又は第２ケースの当接部との間の隙間を塞ぐことができ、ケースの密閉性をより一層向上させることができる。   Moreover, according to the form which has the 2nd protrusion part which the other of the 1st case or the 2nd case contact | abuts to the side surface of a movable piece, the side surface of a movable piece, and the contact part of a 1st case or a 2nd case The gap between them can be closed, and the sealing of the case can be further improved.

また、第１突出部の稜線と第２突出部の稜線とが、少なくとも一部において同一平面上に配設されている形態によれば、第１ケースに第２ケースが装着されることにより、可動片の周方向（短手方向及び厚み方向）に第１突出部と第２突出部が連続して配置されることになり、ケースの密閉性をより一層向上させることができる。   Moreover, according to the form in which the ridge line of the first protrusion and the ridge line of the second protrusion are at least partially disposed on the same plane, the second case is attached to the first case, The first projecting portion and the second projecting portion are continuously arranged in the circumferential direction (short direction and thickness direction) of the movable piece, and the sealing performance of the case can be further improved.

また、前記第１ケース又は第２ケースのうちの一方が、第１ケースの第２突出部に当接する第３突出部を有する形態によれば、第２突出部の近傍における第１ケースと第２ケースとの隙間を第３突出部によって塞ぐことができ、ケースの密閉性をより一層向上させることができる。   In addition, according to the aspect in which one of the first case or the second case has the third protrusion that contacts the second protrusion of the first case, the first case and the second case in the vicinity of the second protrusion The gap between the two cases can be closed by the third projecting portion, and the sealing performance of the case can be further improved.

また、第３突出部が、第２突出部に対して、可動片の弾性部の側又は端子の側に配設されている形態によれば、異物の侵入する方向（可動片の長手方向）に第２突出部と第３突出部が連続して配置されるので、ケースの密閉性をより一層向上させることができる。   Further, according to the embodiment in which the third protrusion is disposed on the elastic part side of the movable piece or the terminal side with respect to the second protrusion, the direction in which foreign matter enters (longitudinal direction of the movable piece) Since the 2nd protrusion part and the 3rd protrusion part are continuously arranged, the sealability of the case can be further improved.

また、可動片が、第１突出部及び／又は前記第２突出部に対応する凹部を有する形態によれば、凹部に第１突出部及び／又は第２突出部が相補的形状で隙間なく嵌合されることにより、ケースの密閉性をより一層向上させることができる。   Further, according to the form in which the movable piece has the first protrusion and / or the recess corresponding to the second protrusion, the first protrusion and / or the second protrusion is fitted in the recess without a gap. By being combined, the sealing property of the case can be further improved.

また、本発明のブレーカーを備えた安全回路又は２次電池パックによれば、ブレーカーのケースの密閉性を高めて、熱応動素子の腐食や可動片の動作不良などの不具合を抑制することが可能となる。   Moreover, according to the safety circuit or the secondary battery pack provided with the breaker of the present invention, it is possible to improve the hermeticity of the breaker case, and to suppress problems such as corrosion of the thermally responsive element and malfunction of the movable piece. It becomes.

本発明の一実施形態によるブレーカーの構成を示す組み立て斜視図。The assembly perspective view which shows the structure of the breaker by one Embodiment of this invention. 通常の充電又は放電状態におけるブレーカーの動作を示す断面図。Sectional drawing which shows operation | movement of the breaker in a normal charge or discharge state. 過充電状態又は異常時などにおけるブレーカーの動作を示す断面図。Sectional drawing which shows operation | movement of a breaker in the time of an overcharge state or abnormality. （ａ）は熱応動素子及び可動片等の部品が組み込まれた樹脂ベースを示す斜視図、（ｂ）は樹脂ベースに装着されるカバー部材を裏返して示す斜視図。(A) is a perspective view which shows the resin base in which components, such as a thermally responsive element and a movable piece, were integrated, (b) is a perspective view which turns over and shows the cover member with which a resin base is mounted | worn. 樹脂ベースに可動片が組み込まれ、カバー部材が装着される様子を時系列で示す断面図。Sectional drawing which shows a mode that a movable piece is integrated in a resin base and a cover member is mounted | worn in time series. 樹脂ベースに可動片が組み込まれ、カバー部材が装着されて、接合される様子を時系列で、第１リブ、第２リブ、第３リブを含む断面で示す半断面図。The semi-sectional view which shows a mode that a movable piece is integrated in a resin base, a cover member is mounted | worn, and it is a time series and shows the cross section containing a 1st rib, a 2nd rib, and a 3rd rib. （ａ）は第２リブ等の変形例を示す樹脂ベースの斜視図、（ｂ）は第１リブ及び第３リブ等の変形例を示すカバー部材の斜視図。(A) is a perspective view of the resin base which shows modifications, such as a 2nd rib, (b) is a perspective view of the cover member which shows modifications, such as a 1st rib and a 3rd rib. （ａ）は第２リブ等の別の変形例を示す樹脂ベースの斜視図、（ｂ）は第１リブ及び第３リブ等の別の変形例を示すカバー部材の斜視図。(A) is a perspective view of the resin base which shows another modification, such as a 2nd rib, (b) is a perspective view of the cover member which shows another modification, such as a 1st rib and a 3rd rib. 本発明のブレーカーを備えた２次電池パックの構成を示す平面図。The top view which shows the structure of the secondary battery pack provided with the breaker of this invention. 本発明のブレーカーを備えた安全回路の回路図。The circuit diagram of the safety circuit provided with the breaker of this invention.

本発明の一実施形態によるブレーカーについて図面を参照して説明する。図１乃至図３はブレーカーの構成を示す。ブレーカー１は、固定接点２１を有する固定片２と、先端部に可動接点３を有する可動片４と、温度変化に伴って変形する熱応動素子５と、ＰＴＣ（Positive Temperature Coefficient）サーミスター６と、固定片２、可動片４、熱応動素子５及びＰＴＣサーミスター６を収容するケース７等によって構成されている。ケース７は、樹脂ベース（第１ケース）７１と樹脂ベース７１の上面に装着されるカバー部材（第２ケース）７２等によって構成されている。   A breaker according to an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show the configuration of the breaker. The breaker 1 includes a fixed piece 2 having a fixed contact 21, a movable piece 4 having a movable contact 3 at the tip, a thermally responsive element 5 that deforms with a change in temperature, a PTC (Positive Temperature Coefficient) thermistor 6, , A fixed piece 2, a movable piece 4, a thermally responsive element 5, and a case 7 for housing a PTC thermistor 6. The case 7 includes a resin base (first case) 71, a cover member (second case) 72 attached to the upper surface of the resin base 71, and the like.

固定片２は、リン青銅を主成分とする金属板（この他、銅−チタン合金、洋白、黄銅などの金属板）をプレス加工することにより形成され、樹脂ベース７１にインサート成形により埋め込まれている。固定片２の一端には外部と電気的に接続される端子２２が形成され、他端部の近傍にはＰＴＣサーミスター６が載置されている。ＰＴＣサーミスター６は、固定片２の他端部の近傍に３箇所形成された凸状のダボ（小突起）の上に載置される。固定接点２１は、銀、ニッケル、ニッケル−銀合金の他、銅−銀合金、金−銀合金などの導電性の良い材料のクラッド、メッキ又は塗布等により可動接点３に対向する位置に形成され、樹脂ベース７１の上方に形成されている開口７３ｂから露出されている。端子２２は樹脂ベース７１の一端から外側に露出されている。   The fixed piece 2 is formed by pressing a metal plate mainly composed of phosphor bronze (in addition, a metal plate such as copper-titanium alloy, white or brass), and is embedded in the resin base 71 by insert molding. ing. A terminal 22 electrically connected to the outside is formed at one end of the fixed piece 2, and a PTC thermistor 6 is placed in the vicinity of the other end. The PTC thermistor 6 is placed on convex dowels (small protrusions) formed at three locations in the vicinity of the other end of the fixed piece 2. The fixed contact 21 is formed at a position facing the movable contact 3 by cladding, plating, coating, or the like of a conductive material such as silver, nickel, nickel-silver alloy, copper-silver alloy, gold-silver alloy. And exposed from an opening 73 b formed above the resin base 71. The terminal 22 is exposed to the outside from one end of the resin base 71.

可動片４は、板状の金属材料をプレス加工することにより、長手方向の中心線に対して対称なアーム状に形成されている。可動片４の材料としては、固定片２と同等のリン青銅を主成分とするものが好ましい。この他、銅−チタン合金、洋白、黄銅などの導電性弾性材料を用いてもよい。可動片４の長手方向の一端には外部回路と電気的に接続される端子４１が形成されて樹脂ベース７１から外側に露出される。可動片４の他端（アーム状の可動片４の先端に相当）には可動接点３が形成されている。可動接点３は、固定接点２１と同等の材料によって形成され、溶接等の手法によって可動片４の先端部に接合されている。なお、本出願においては、可動片４において、可動接点３が接合されている面（すなわち図１において下側の面）を裏（うら）面、その反対側の面を表（おもて）面として説明している。可動片４は、可動接点３と端子４１の間に、固定部４２（アーム状の可動片４の基端に相当）、弾性部４３を有している。固定部４２において樹脂ベース７１とカバー部材７２によって裏表両面側から挟み込まれて可動片４が固定され、弾性部４３が弾性変形することにより、その先端に形成されている可動接点３が固定接点２１の側に押圧されて接触し、固定片２と可動片４とが通電可能となる。樹脂ベース７１とカバー部材７２には、可動片４の固定部４２と当接し、固定部４２を固定状態で保持する当接部７４と当接部７９（図４（ｂ）参照）がそれぞれ形成されている。本実施形態では、樹脂ベース７１の収容部７３の外縁から樹脂ベース７１の外壁に亘る領域に当接部７４が形成されている。また、カバー部材７２において、段部７７を含み、可動片４を挟んで当接部７４と対向する領域に当接部７９が形成されている。   The movable piece 4 is formed in an arm shape symmetrical to the center line in the longitudinal direction by pressing a plate-like metal material. As a material of the movable piece 4, a material mainly composed of phosphor bronze equivalent to the fixed piece 2 is preferable. In addition, a conductive elastic material such as copper-titanium alloy, white or brass may be used. A terminal 41 electrically connected to an external circuit is formed at one end in the longitudinal direction of the movable piece 4 and is exposed to the outside from the resin base 71. A movable contact 3 is formed at the other end of the movable piece 4 (corresponding to the tip of the arm-shaped movable piece 4). The movable contact 3 is made of the same material as the fixed contact 21 and is joined to the tip of the movable piece 4 by a technique such as welding. In the present application, in the movable piece 4, the surface to which the movable contact 3 is joined (that is, the lower surface in FIG. 1) is the back surface, and the opposite surface is the front surface. It is described as a surface. The movable piece 4 has a fixed portion 42 (corresponding to the base end of the arm-shaped movable piece 4) and an elastic portion 43 between the movable contact 3 and the terminal 41. The movable piece 4 is fixed by being sandwiched by the resin base 71 and the cover member 72 at the fixed portion 42 from the front and back sides, and the elastic portion 43 is elastically deformed, whereby the movable contact 3 formed at the tip of the fixed portion 21 is fixed. The fixed piece 2 and the movable piece 4 can be energized. The resin base 71 and the cover member 72 are respectively formed with an abutting portion 74 and an abutting portion 79 (see FIG. 4B) that abut against the fixed portion 42 of the movable piece 4 and hold the fixed portion 42 in a fixed state. Has been. In the present embodiment, a contact portion 74 is formed in a region extending from the outer edge of the housing portion 73 of the resin base 71 to the outer wall of the resin base 71. The cover member 72 includes a stepped portion 77, and a contact portion 79 is formed in a region facing the contact portion 74 across the movable piece 4.

可動片４は、弾性部４３において、プレス加工により湾曲又は屈曲されている。湾曲又は屈曲の度合いは、熱応動素子５を収容できる限り特に限定はなく、動作温度及び復帰温度における弾性力、接点の押圧力などを考慮して適宜設定すればよい。また、弾性部４３の下面には、熱応動素子５に対向して一対の小突起４４が形成されている。小突起４４と熱応動素子５とは接触して、小突起４４を介して熱応動素子５の変形が弾性部４３に伝達される（図２及び図３参照）。   The movable piece 4 is curved or bent at the elastic portion 43 by pressing. The degree of bending or bending is not particularly limited as long as the thermally responsive element 5 can be accommodated, and may be set as appropriate in consideration of the elastic force at the operating temperature and the return temperature, the pressing force of the contacts, and the like. In addition, a pair of small protrusions 44 are formed on the lower surface of the elastic portion 43 so as to face the thermally responsive element 5. The small protrusion 44 and the thermal response element 5 come into contact with each other, and the deformation of the thermal response element 5 is transmitted to the elastic portion 43 through the small protrusion 44 (see FIGS. 2 and 3).

また、可動片４には、可動片４の厚み方向に貫通し、樹脂ベース７１の突起７４ａが挿通される貫通穴４５と、クランク状に形成された段曲げ部４６と、段曲げ部４６に形成された斜面４７と、樹脂ベース７１の位置決め部７５と係合される一対の係合部４８と、可動片４の長手方向に対して垂直な短手方向に可動片４の一部が切除されたくびれ部４９が形成されている。貫通穴４５、段曲げ部４６、斜面４７、係合部４８及びくびれ部４９は、弾性部４３を挟んで可動接点３とは反対側、すなわち弾性部４３に対して端子４１の側に設けられている。貫通穴４５は、可動片４の長手方向の中心線上に設けられている。斜面４７は、可動片４の方向に沿って連続して形成されている。係合部４８は、可動片４の短手方向に沿って２箇所に設けられている。   Further, the movable piece 4 has a through hole 45 that penetrates in the thickness direction of the movable piece 4 and through which the protrusion 74a of the resin base 71 is inserted, a step bent portion 46 formed in a crank shape, and a step bent portion 46. Part of the movable piece 4 is cut off in the short direction perpendicular to the longitudinal direction of the movable piece 4 and the formed slope 47, the pair of engaging portions 48 engaged with the positioning portion 75 of the resin base 71. A constricted portion 49 is formed. The through hole 45, the step bent part 46, the slope 47, the engaging part 48, and the constricted part 49 are provided on the opposite side of the movable contact 3 with the elastic part 43 interposed therebetween, that is, on the terminal 41 side with respect to the elastic part 43. ing. The through hole 45 is provided on the center line in the longitudinal direction of the movable piece 4. The slope 47 is formed continuously along the direction of the movable piece 4. The engaging portions 48 are provided at two locations along the short direction of the movable piece 4.

貫通穴４５は、可動片４の固定部４２に形成されている。固定部４２は、弾性部４３に対して可動片４の短手方向に幅広に形成されている。これにより、固定部４２における可動片４の長手方向に垂直な断面積が、弾性部４３における該断面積に対して大きい箇所となる。また、貫通穴４５は、平面視で（可動片４の厚み方向に視て）可動片４の短手方向に長い長円形状に形成されている。   The through hole 45 is formed in the fixed portion 42 of the movable piece 4. The fixed portion 42 is formed wider than the elastic portion 43 in the short direction of the movable piece 4. Thereby, the cross-sectional area perpendicular to the longitudinal direction of the movable piece 4 in the fixed portion 42 becomes a portion larger than the cross-sectional area in the elastic portion 43. Further, the through hole 45 is formed in an oval shape that is long in the lateral direction of the movable piece 4 in plan view (as viewed in the thickness direction of the movable piece 4).

係合部４８は、くびれ部４９の端子４１側の端縁にて形成される。くびれ部４９は、固定部４２を挟んで弾性部４３とは反対側で、固定部４２と端子４１の間に配設されている。くびれ部４９の幅寸法（可動片４の短手方向の長さ寸法、以下同様）は、弾性部４３の幅寸法に対して同等以下に設定されているのが望ましいが、少なくとも固定部４２及び端子４１の幅寸法よりも小さく設定されていればよい。本実施形態におけるくびれ部４９は、上記特許文献１における第２弾性部としての機能を有しており、端子４１に加えられた外力や衝撃を吸収し、可動接点３の位置を適正に維持する。   The engaging portion 48 is formed at the edge of the constricted portion 49 on the terminal 41 side. The constricted portion 49 is disposed between the fixed portion 42 and the terminal 41 on the opposite side of the elastic portion 43 with the fixed portion 42 interposed therebetween. The width dimension of the constricted portion 49 (the length dimension of the movable piece 4 in the short direction, hereinafter the same) is preferably set equal to or less than the width dimension of the elastic portion 43, but at least the fixed portion 42 and What is necessary is just to set smaller than the width dimension of the terminal 41. FIG. The constricted part 49 in this embodiment has a function as the second elastic part in the above-mentioned Patent Document 1, and absorbs an external force and an impact applied to the terminal 41 and appropriately maintains the position of the movable contact 3. .

熱応動素子５は円弧状に湾曲した初期形状をなし、バイメタル、トリメタルなどの複合材料からなる。過熱により動作温度に達すると湾曲形状はスナップモーションを伴って逆反りし、冷却により復帰温度を下回ると復元する。熱応動素子５の初期形状は、プレス加工により形成することができる。所期の温度で熱応動素子５の逆反り動作により可動片４の弾性部４３が押し上げられ、かつ弾性部４３の弾性力により元に戻る限り、熱応動素子５の材質及び形状は特に限定されるものでないが、生産性及び逆反り動作の効率性の観点から矩形が望ましく、小型でありながら弾性部４３を効率的に押し上げるために正方形に近い長方形であるのが望ましい。なお、熱応動素子５の材料としては、例えば、高膨脹側に銅−ニッケル−マンガン合金又はニッケル−クロム−鉄合金、低膨脹側に鉄−ニッケル合金をはじめとする、洋白、黄銅、ステンレスなど各種の合金からなる熱膨張率の異なる２種類の材料を積層したものが、所要条件に応じて組み合わせて使用される。   The thermally responsive element 5 has an initial shape curved in an arc shape and is made of a composite material such as bimetal or trimetal. When the operating temperature is reached due to overheating, the curved shape is reversely warped with snap motion, and is restored when the temperature falls below the return temperature due to cooling. The initial shape of the thermoresponsive element 5 can be formed by pressing. As long as the elastic portion 43 of the movable piece 4 is pushed up by the reverse warping operation of the thermal response element 5 at a desired temperature and returns to the original state by the elastic force of the elastic portion 43, the material and shape of the thermal response element 5 are particularly limited. Although not intended, a rectangular shape is desirable from the viewpoint of productivity and efficiency of reverse warping operation, and it is desirable that the rectangular shape is close to a square in order to efficiently push up the elastic portion 43 while being small. Examples of the material of the thermally responsive element 5 include, for example, white, brass, and stainless steel including copper-nickel-manganese alloy or nickel-chromium-iron alloy on the high expansion side and iron-nickel alloy on the low expansion side. A material obtained by laminating two kinds of materials made of various alloys having different coefficients of thermal expansion is used in combination according to the required conditions.

熱応動素子５の逆反り動作により固定片２と可動片４との通電が遮断されたとき、ＰＴＣサーミスター６に流れる電流が増大する。ＰＴＣサーミスター６は、温度上昇と共に抵抗値が増大して電流を制限する正特性サーミスターであれば、動作電流、動作電圧、動作温度、復帰温度などの必要に応じて種類を選択でき、その形状はこれらの諸特性を損なわない限り特に限定されるものではない。   When the energization of the fixed piece 2 and the movable piece 4 is interrupted by the reverse warping operation of the thermal response element 5, the current flowing through the PTC thermistor 6 increases. As long as the PTC thermistor 6 is a positive temperature coefficient thermistor that limits the current by increasing the resistance value as the temperature rises, the type of operation current, operation voltage, operation temperature, return temperature, etc. can be selected as necessary. The shape is not particularly limited as long as these properties are not impaired.

ケース７を構成する樹脂ベース７１及びカバー部材７２は、難燃性のポリアミド、耐熱性に優れたポリフェニレンサルファイド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）、ポリブチレンテレフタレート（ＰＢＴ）などの樹脂により成形されている。樹脂ベース７１には、熱応動素子５及びＰＴＣサーミスター６などを収容するための収容部７３及び可動片４を収容するための開口７３ａ，７３ｂなどが形成されている。なお、樹脂ベース７１に組み込まれた熱応動素子５及びＰＴＣサーミスター６の端縁は、収容部７３の内部に形成されている枠によってそれぞれ当接され、熱応動素子５の逆反り時に案内される。   The resin base 71 and the cover member 72 constituting the case 7 are molded from a resin such as flame retardant polyamide, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT) having excellent heat resistance. Yes. The resin base 71 is formed with a housing part 73 for housing the thermal actuator 5 and the PTC thermistor 6, openings 73 a and 73 b for housing the movable piece 4, and the like. Note that the edges of the thermal reaction element 5 and the PTC thermistor 6 incorporated in the resin base 71 are brought into contact with each other by a frame formed inside the housing portion 73 and are guided when the thermal reaction element 5 is reversely warped. The

また、樹脂ベース７１は、可動片４の貫通穴４５に挿通される突起７４ａと、可動片４を位置決めするための一対の位置決め部７５と、可動片４の端子４１を外部に露出させるための窓７６を有する。突起７４ａは、貫通穴４５に対応し、平面視で長円形状に形成され、樹脂ベース７１を補強する。突起７４ａの高さすなわち突出量は、可動片４の厚みより大きく設定され、カバー部材７２の裏面には、突起７４ａの頂部が嵌合される凹部が必要に応じて設けられる。位置決め部７５は、可動片４の長手方向に対して垂直な方向に沿って２箇所に設けられている。本実施形態では、窓７６の存在によって、樹脂ベース７１の側壁の一部が可動片４のくびれ部４９に対応する形状に形成され、位置決め部７５を構成する。すなわち、位置決め部７５は、くびれ部４９の近傍において切除された部分に介在し、樹脂ベース７１を補強する。   The resin base 71 has a projection 74a inserted into the through hole 45 of the movable piece 4, a pair of positioning portions 75 for positioning the movable piece 4, and a terminal 41 for exposing the movable piece 4 to the outside. A window 76 is provided. The protrusion 74 a corresponds to the through hole 45, is formed in an oval shape in plan view, and reinforces the resin base 71. The height of the protrusion 74 a, that is, the protrusion amount is set to be larger than the thickness of the movable piece 4, and a concave portion into which the top of the protrusion 74 a is fitted is provided on the back surface of the cover member 72 as necessary. The positioning portions 75 are provided at two locations along a direction perpendicular to the longitudinal direction of the movable piece 4. In the present embodiment, due to the presence of the window 76, a part of the side wall of the resin base 71 is formed in a shape corresponding to the constricted portion 49 of the movable piece 4 and constitutes the positioning portion 75. That is, the positioning part 75 is interposed in a part cut out in the vicinity of the constricted part 49 and reinforces the resin base 71.

カバー部材７２は、その内壁面から可動片４の段曲げ部４６に対応する形状に突出する段部７７と、段部７７に形成された斜面７８（図５参照）とを有する。斜面７８は、可動片４の斜面４７に対応し、可動片４の長手方向に対して垂直な方向に沿って連続して形成されている。   The cover member 72 has a stepped portion 77 protruding from its inner wall surface into a shape corresponding to the stepped bent portion 46 of the movable piece 4, and an inclined surface 78 (see FIG. 5) formed on the stepped portion 77. The slope 78 corresponds to the slope 47 of the movable piece 4 and is continuously formed along a direction perpendicular to the longitudinal direction of the movable piece 4.

カバー部材７２には、カバー片８がインサート成形によって埋め込まれている。カバー片８は、上述したリン青銅を主成分とする金属板又はステンレス等の金属板をプレス加工することにより形成される。カバー片８は、図２及び図３に示すように、可動片４の上面と適宜当接し、可動片４の動きを規制すると共に、カバー部材７２のひいては筐体としてのケース７の剛性・強度を高める。   A cover piece 8 is embedded in the cover member 72 by insert molding. The cover piece 8 is formed by pressing a metal plate mainly composed of phosphor bronze or a metal plate such as stainless steel. As shown in FIGS. 2 and 3, the cover piece 8 abuts on the upper surface of the movable piece 4 as appropriate, restricts the movement of the movable piece 4, and the rigidity and strength of the case 7 as a casing as a result of the cover member 72. To increase.

図１に示すように、固定片２、可動片４、熱応動素子５及びＰＴＣサーミスター６等を収容した樹脂ベース７１の収容部７３を塞ぐように、カバー部材７２が、樹脂ベース７１の上面に装着される。樹脂ベース７１とカバー部材７２とは、例えば超音波溶着によって接合される。   As shown in FIG. 1, the cover member 72 is disposed on the upper surface of the resin base 71 so as to close the housing portion 73 of the resin base 71 that houses the fixed piece 2, the movable piece 4, the thermally responsive element 5, the PTC thermistor 6 and the like. It is attached to. The resin base 71 and the cover member 72 are joined by, for example, ultrasonic welding.

図２は、通常の充電又は放電状態におけるブレーカー１の動作を示している。通常の充電又は放電状態においては、熱応動素子５は初期形状を維持し（逆反り前であり）、固定接点２１と可動接点３は接触し、可動片４の弾性部４３などを通じてブレーカー１の両端子２２、４１間は導通している。可動片４の弾性部４３と熱応動素子５とは接触しており、可動片４、熱応動素子５、ＰＴＣサーミスター６及び固定片２は、回路として導通している。しかし、ＰＴＣサーミスター６の抵抗は、可動片４の抵抗に比べて圧倒的に大きいため、ＰＴＣサーミスター６を流れる電流は、固定接点２１及び可動接点３を流れる量に比して実質的に無視できる程度である。   FIG. 2 shows the operation of the breaker 1 in a normal charge or discharge state. In a normal charging or discharging state, the thermal responsive element 5 maintains the initial shape (before reverse warping), the fixed contact 21 and the movable contact 3 come into contact with each other, and the breaker 1 passes through the elastic portion 43 of the movable piece 4. The terminals 22 and 41 are electrically connected. The elastic part 43 of the movable piece 4 and the thermal responsive element 5 are in contact, and the movable piece 4, the thermal responsive element 5, the PTC thermistor 6 and the fixed piece 2 are electrically connected as a circuit. However, since the resistance of the PTC thermistor 6 is overwhelmingly larger than the resistance of the movable piece 4, the current flowing through the PTC thermistor 6 is substantially larger than the amount flowing through the fixed contact 21 and the movable contact 3. It can be ignored.

図３は、過充電状態又は異常時などにおけるブレーカー１の動作を示している。過充電又は異常により高温状態となると、ＰＴＣサーミスター６が過熱され、動作温度に達した熱応動素子５は逆反りし、可動片４の弾性部４３が押し上げられて固定接点２１と可動接点３とが離反する。このとき、固定接点２１と可動接点３の間を流れていた電流は遮断され、僅かな漏れ電流が熱応動素子５及びＰＴＣサーミスター６を通して流れることとなる。ＰＴＣサーミスター６は、このような漏れ電流の流れる限り発熱を続け、熱応動素子５を逆反り状態に維持させつつ抵抗値を激増させるので、電流は固定接点２１と可動接点３の間の経路を流れず、上述の僅かな漏れ電流のみが存在する（自己保持回路を構成する）。この漏れ電流は安全装置の他の機能に充てることができる。   FIG. 3 shows the operation of the breaker 1 in an overcharged state or an abnormality. When the PTC thermistor 6 is overheated due to overcharging or abnormality, the thermal actuator 5 that has reached the operating temperature is warped in reverse, and the elastic portion 43 of the movable piece 4 is pushed up so that the fixed contact 21 and the movable contact 3 Are separated from each other. At this time, the current flowing between the fixed contact 21 and the movable contact 3 is interrupted, and a slight leakage current flows through the thermal actuator 5 and the PTC thermistor 6. Since the PTC thermistor 6 continues to generate heat as long as such a leakage current flows, the resistance value is drastically increased while maintaining the thermally actuated element 5 in the reverse warped state, so that the current is a path between the fixed contact 21 and the movable contact 3. There is only the above-described slight leakage current (which constitutes a self-holding circuit). This leakage current can be used for other functions of the safety device.

過充電状態を解除し、又は異常状態を解消すると、ＰＴＣサーミスター６の発熱も収まり、熱応動素子５は復帰温度に戻り、元の初期形状に復元する。そして、可動片４の弾性部４３の弾性力によって可動接点３と固定接点２１とは再び接触し、回路は遮断状態を解かれ、図２に示す導通状態に復帰する。   When the overcharge state is canceled or the abnormal state is resolved, the heat generation of the PTC thermistor 6 is also stopped, and the thermal actuator 5 returns to the return temperature and is restored to the original initial shape. Then, the movable contact 3 and the fixed contact 21 come into contact again by the elastic force of the elastic portion 43 of the movable piece 4, the circuit is released from the interruption state, and returns to the conduction state shown in FIG.

図４（ａ）は、ＰＴＣサーミスター６、熱応動素子５及び可動片４が順次組み込まれた樹脂ベース７１を、図４（ｂ）は、樹脂ベース７１に装着されるカバー部材７２を裏返して示している。図４に示すように、樹脂ベース７１、カバー部材７２には、第１リブ（第１突出部）７７ａ、第２リブ（第２突出部）７５ｂ、第３リブ（第３突出部）７７ｃが形成されている。また、樹脂ベース７１の当接部７４の端子４１側の端縁近傍７４ｂ、位置決め部７５の中間側壁７５ａ及びカバー部材７２の段部７７の底壁７７ｂによって、窓７６の窓枠が構成され、可動片４の固定部４２と当接する。   4A shows the resin base 71 in which the PTC thermistor 6, the thermal actuator 5 and the movable piece 4 are sequentially incorporated, and FIG. 4B shows the cover member 72 mounted on the resin base 71 turned upside down. Show. As shown in FIG. 4, the resin base 71 and the cover member 72 have a first rib (first projecting portion) 77a, a second rib (second projecting portion) 75b, and a third rib (third projecting portion) 77c. Is formed. Further, a window frame of the window 76 is configured by the edge portion 74b near the terminal 41 side of the contact portion 74 of the resin base 71, the intermediate side wall 75a of the positioning portion 75, and the bottom wall 77b of the stepped portion 77 of the cover member 72, It contacts the fixed portion 42 of the movable piece 4.

第１リブ７７ａは、カバー部材７２の当接部７９を構成する段部７７の底壁７７ｂから可動片４の表面の側に突出して形成されている。第１リブ７７ａは、可動片４の短手方向に連続的な線状に***するように形成されている。第１リブ７７ａの突出量及び幅は、可動片４の短手方向に略一定に形成されている。第２リブ７５ｂは、当接部７４を構成する樹脂ベース７１の位置決め部７５の中間側壁（当接部）７５ａから可動片４のくびれ部４９の側面の側に突出して形成されている。第２リブ７５ｂは、カバー部材７２の段部７７の突き出し高さの半分以上の高さ領域に形成され、その突出量は、後述する図６において、可動片４の下降を妨げない程度に設定され、当接部７４の可動片４の裏面と当接する面から上方に離れるに従い漸減される。また、第２リブ７５ｂの幅は、当接部７４の可動片４の裏面と当接する面から上方に離れるに従い漸減され、その輪郭の可動片４の短手方向に視た投影形状は、上方に凸の放物線状とされる。第３リブ７７ｃは、カバー部材７２の段部７７の側壁７７ｄから樹脂ベース７１の中間側壁７５ａの側に突出して形成されている。第３リブ７７ｃは、段部７７の突き出し高さの半分程度又はそれ以上の高さ領域に形成され、その突出量は、第１リブ７７ａに近づくに従い漸減される。また、第３リブ７７ｃの幅は、段部７７の底壁７７ｂに近づくに従い漸減され、その輪郭の可動片４の短手方向に視た投影形状は、下方に凸の放物線状とされる。これにより、第２リブ７５ｂと第３リブ７７ｃとが、ブレーカー１の厚み方向に相補的形状となって、中間側壁７５ａと段部７７の側壁７７ｄとの隙間を効果的に塞ぐ。   The first rib 77 a is formed to project from the bottom wall 77 b of the stepped portion 77 constituting the contact portion 79 of the cover member 72 to the surface side of the movable piece 4. The first ribs 77 a are formed so as to protrude in a continuous linear shape in the short direction of the movable piece 4. The protruding amount and the width of the first rib 77 a are formed substantially constant in the short direction of the movable piece 4. The second rib 75 b is formed so as to protrude from the intermediate side wall (contact portion) 75 a of the positioning portion 75 of the resin base 71 constituting the contact portion 74 to the side surface side of the constricted portion 49 of the movable piece 4. The second rib 75b is formed in a height region that is more than half of the protruding height of the stepped portion 77 of the cover member 72, and the protruding amount is set to such an extent that the lowering of the movable piece 4 is not hindered in FIG. Then, it gradually decreases as the distance from the surface of the contact portion 74 that contacts the back surface of the movable piece 4 increases. In addition, the width of the second rib 75b is gradually reduced as the distance from the surface of the contact portion 74 that contacts the back surface of the movable piece 4 increases, and the projected shape of the contour of the movable piece 4 viewed in the short direction is Convex parabolic shape. The third rib 77 c is formed to protrude from the side wall 77 d of the stepped portion 77 of the cover member 72 toward the intermediate side wall 75 a of the resin base 71. The third rib 77c is formed in a height region of about half or more of the protruding height of the stepped portion 77, and the protruding amount is gradually reduced as the first rib 77a is approached. In addition, the width of the third rib 77c is gradually reduced as it approaches the bottom wall 77b of the stepped portion 77, and the projected shape of the contour of the movable piece 4 viewed in the short direction is a parabolic shape convex downward. Thereby, the 2nd rib 75b and the 3rd rib 77c become a complementary shape in the thickness direction of the breaker 1, and block | close the clearance gap between the intermediate side wall 75a and the side wall 77d of the step part 77 effectively.

第２リブ７５ｂと第３リブ７７ｃは、樹脂ベース７１への可動片４の組み込みを阻害することなく、中間側壁７５ａと側壁７７ｄと隙間を相補う形状に形成されている（後述する図６参照）。また、図４中２点鎖線で示す第１リブ７７ａの稜線７７ｅ、第２リブ７５ｂの稜線７５ｆ及び第３リブ７７ｃの稜線７７ｇは、それぞれ可動片４の長手方向に垂直な同一平面上に配設されている。従って、樹脂ベース７１にカバー部材７２が装着される際、互いに対向する第２リブ７５ｂと第３リブ７７ｃとは、平面視で重複する。   The second rib 75b and the third rib 77c are formed in a shape that complements the gap between the intermediate side wall 75a and the side wall 77d without hindering the incorporation of the movable piece 4 into the resin base 71 (see FIG. 6 described later). ). Further, the ridgeline 77e of the first rib 77a, the ridgeline 75f of the second rib 75b, and the ridgeline 77g of the third rib 77c indicated by the two-dot chain line in FIG. It is installed. Therefore, when the cover member 72 is attached to the resin base 71, the second rib 75b and the third rib 77c facing each other overlap in plan view.

図５及び図６は、樹脂ベース７１に可動片４が組み込まれ、カバー部材７２が装着される様子を示す。図５（ａ）に示す状態は、図６（ａ）に示す状態に対応し、図５（ｂ）に示す状態は、図６（ｂ）に示す状態に対応している。なお、図６（ｃ）に示す状態は、図２に示す状態に対応している。   5 and 6 show a state in which the movable piece 4 is incorporated in the resin base 71 and the cover member 72 is attached. The state shown in FIG. 5A corresponds to the state shown in FIG. 6A, and the state shown in FIG. 5B corresponds to the state shown in FIG. The state shown in FIG. 6C corresponds to the state shown in FIG.

可動片４は、樹脂ベース７１の開口７３ａ，７３ｂに案内されて樹脂ベース７１に組み込まれる。このとき、可動片４に形成されているくびれ部４９の両側の係合部４８に位置決め部７５が係合されると共に、貫通穴４５に樹脂ベース７１の突起７４ａが挿通される。また、図４（ａ）に示すように、可動片４が樹脂ベース７１に組み込まれ、カバー部材７２が装着される前の初期状態では、可動片４のくびれ部４９の側壁が、第２リブ７５ｂと当接し、樹脂ベース７１の当接部７４に対して可動片４のくびれ部４９の領域が浮いた状態で載置される（図６（ｂ）参照）。これにより、可動片４が位置決め部７５（第２リブ７５ｂ）及び突起７４ａによって案内されるので、樹脂ベース７１に対する可動片４の仮の位置合わせがなされる。また、貫通穴４５に突起７４ａが挿通されることに加え、一対の係合部４８と一対の位置決め部７５との係合により、樹脂ベース７１に対する可動片４の回転が規制され、仮の位置決めが容易に行われる。   The movable piece 4 is guided into the openings 73 a and 73 b of the resin base 71 and incorporated into the resin base 71. At this time, the positioning portion 75 is engaged with the engaging portions 48 on both sides of the constricted portion 49 formed on the movable piece 4, and the protrusion 74 a of the resin base 71 is inserted into the through hole 45. Further, as shown in FIG. 4A, in the initial state before the movable piece 4 is incorporated into the resin base 71 and the cover member 72 is attached, the side wall of the constricted portion 49 of the movable piece 4 is the second rib. 75b, and the constricted portion 49 of the movable piece 4 is placed in a floating state with respect to the abutting portion 74 of the resin base 71 (see FIG. 6B). As a result, the movable piece 4 is guided by the positioning portion 75 (second rib 75b) and the protrusion 74a, so that the temporary alignment of the movable piece 4 with respect to the resin base 71 is performed. Further, in addition to the protrusion 74a being inserted into the through hole 45, the engagement of the pair of engaging portions 48 and the pair of positioning portions 75 restricts the rotation of the movable piece 4 with respect to the resin base 71. Is easily done.

この仮の位置合わせの段階では、樹脂ベース７１に対する可動片４の位置合わせが正確になされている必要はない。また、可動片４は、後の工程で最終的な位置合わせができるように、樹脂ベース７１の上に載置された状態であり、固定されてはいない。なお、樹脂ベース７１の開口７３ａ，７３ｂ及び突起７４ａの位置、形状、寸法等は、仮の位置合わせがなされた位置から完全に位置決めされる定位置まで可動片４を案内し易くなるように、可動片４の対応する箇所と相似形に形成されている。   In this temporary alignment stage, it is not necessary that the movable piece 4 is accurately positioned with respect to the resin base 71. Further, the movable piece 4 is placed on the resin base 71 so as to be finally aligned in a later process, and is not fixed. The positions, shapes, dimensions, and the like of the openings 73a and 73b and the protrusions 74a of the resin base 71 are such that it is easy to guide the movable piece 4 from the position where provisional alignment is performed to the fixed position where it is completely positioned. It is formed in a similar shape to the corresponding part of the movable piece 4.

図４（ａ）、図５（ａ）、図６（ａ）に示すように可動片４が樹脂ベース７１に組み込まれた後、樹脂ベース７１にカバー部材７２が装着される。カバー部材７２は、樹脂ベース７１の開口７３ａに段部７７を挿入し、可動片４の段曲げ部４６に段部７７を押し当てることで可動片４を位置合わせしながら、樹脂ベース７１に装着される。   After the movable piece 4 is assembled in the resin base 71 as shown in FIGS. 4A, 5A, and 6A, the cover member 72 is attached to the resin base 71. The cover member 72 is mounted on the resin base 71 while positioning the movable piece 4 by inserting the stepped portion 77 into the opening 73a of the resin base 71 and pressing the stepped portion 77 against the stepped bent portion 46 of the movable piece 4. Is done.

図５（ｂ）、図６（ｂ）に示すように、樹脂ベース７１にカバー部材７２が装着されると、最初にカバー部材７２の第１リブ７７ａが、可動片４とくびれ部４９が形成されている領域において当接し、この当接した領域を樹脂ベース７１の側に押圧する。このとき、第１リブ７７ａの稜線７７ｅと第２リブ７５ｂの稜線７５ｆとが可動片４の長手方向に垂直な同一平面上に配設されているので、可動片４に曲げ応力がかからない。これにより、可動片４の変形を防止できる。そして、さらにカバー部材７２が樹脂ベース７１の方向（図中白抜き矢印方向）に押圧されると、可動片４の斜面４７とカバー部材７２の斜面７８とが当接する。斜面４７及び斜面７８は、可動片４の長手方向に対して垂直な方向に沿って連続して形成されているので、なおもカバー部材７２が樹脂ベース７１の方向に押圧されると、可動片４の斜面４７はカバー部材７２の斜面７８によって可動片４の長手方向に押される（付勢される）。その結果、斜面７８，４７によって力の方向が変換され、可動片４の全体が長手方向すなわち固定片２の存在する矢印Ａ方向に押されて移動する。このとき、斜面４７に対向して配設されている一対の係合部４８と、斜面７８に対向して配設されている一対の位置決め部７５とが当接して係合する。これにより、図４等において突起７４ａ等によって仮の位置合わせがなされていた可動片４は、樹脂ベース７１に対して正確に位置決めされる。すなわち、樹脂ベース７１に対して可動片４が組み込まれる際に生じている仮の位置合わせ時の誤差は軽減され、樹脂ベース７１に対する可動片４の位置決め誤差を、実質的に樹脂ベース７１の位置決め部７５と可動片４の係合部４８の製造時における寸法誤差程度に留めることができる。   As shown in FIGS. 5B and 6B, when the cover member 72 is attached to the resin base 71, the first rib 77a of the cover member 72 is first formed, and the movable piece 4 and the constricted portion 49 are formed. The contacted area is abutted, and the abutted area is pressed toward the resin base 71. At this time, since the ridgeline 77e of the first rib 77a and the ridgeline 75f of the second rib 75b are arranged on the same plane perpendicular to the longitudinal direction of the movable piece 4, no bending stress is applied to the movable piece 4. Thereby, deformation of the movable piece 4 can be prevented. When the cover member 72 is further pressed in the direction of the resin base 71 (in the direction of the white arrow in the figure), the slope 47 of the movable piece 4 and the slope 78 of the cover member 72 come into contact with each other. Since the inclined surface 47 and the inclined surface 78 are continuously formed along the direction perpendicular to the longitudinal direction of the movable piece 4, the movable piece is still pressed when the cover member 72 is pressed in the direction of the resin base 71. The four slopes 47 are pushed (biased) by the slope 78 of the cover member 72 in the longitudinal direction of the movable piece 4. As a result, the direction of the force is changed by the inclined surfaces 78 and 47, and the entire movable piece 4 is pushed and moved in the longitudinal direction, that is, the arrow A direction where the fixed piece 2 exists. At this time, the pair of engaging portions 48 disposed facing the slope 47 and the pair of positioning portions 75 disposed facing the slope 78 are brought into contact with each other and engaged. As a result, the movable piece 4 that has been temporarily aligned by the protrusion 74 a and the like in FIG. 4 and the like is accurately positioned with respect to the resin base 71. That is, the error at the time of temporary alignment that occurs when the movable piece 4 is assembled with the resin base 71 is reduced, and the positioning error of the movable piece 4 with respect to the resin base 71 is substantially reduced by the positioning of the resin base 71. It can be limited to the extent of dimensional error at the time of manufacture of the engaging part 48 of the part 75 and the movable piece 4.

また、既に述べたように、樹脂ベース７１にカバー部材７２が装着される際に、互いに対向する第２リブ７５ｂと第３リブ７７ｃとは、平面視で重複するように設けられているので、やがては当接し、樹脂ベース７１の移動は一旦妨げられる。このとき、樹脂ベース７１がカバー部材７２の方向に押圧されながら、樹脂ベース７１又はカバー部材７２のいずれか一方又は両方に超音波振動が付与されると、図６（ｃ）に示すように、第２リブ７５ｂと第３リブ７７ｃとの当接部位は摩擦熱により溶融し、樹脂ベース７１の位置決め部７５の中間側壁７５ａと可動片４のくびれ部４９の側壁との隙間、及び中間側壁７５ａとカバー部材７２の段部７７の側壁７７ｄとの隙間に流れ込み、これらの隙間が塞がれる。また、カバー部材７２の第１リブ７７ａによって押圧された可動片４の裏面は、樹脂ベース７１の当接部７４と密着し、両者間の隙間が塞がれる。同時に、第１リブ７７ａは、可動片４の表面との間に生ずる摩擦熱により溶融し、段部７７の底壁７７ｂと可動片４の表面との隙間に流れ込み、この隙間が塞がれる。   Further, as already described, when the cover member 72 is mounted on the resin base 71, the second rib 75b and the third rib 77c facing each other are provided so as to overlap in plan view. Eventually, they come into contact with each other, and the movement of the resin base 71 is once prevented. At this time, when the ultrasonic vibration is applied to one or both of the resin base 71 and the cover member 72 while the resin base 71 is pressed in the direction of the cover member 72, as shown in FIG. The contact portion between the second rib 75b and the third rib 77c is melted by frictional heat, the gap between the intermediate side wall 75a of the positioning portion 75 of the resin base 71 and the side wall of the constricted portion 49 of the movable piece 4, and the intermediate side wall 75a. And the gap between the step 77 of the cover member 72 and the side wall 77d, the gap is closed. Further, the back surface of the movable piece 4 pressed by the first rib 77a of the cover member 72 is in close contact with the contact portion 74 of the resin base 71, and the gap between the two is closed. At the same time, the first rib 77a is melted by frictional heat generated between the first rib 77a and the surface of the movable piece 4, and flows into the gap between the bottom wall 77b of the stepped portion 77 and the surface of the movable piece 4, thereby closing the gap.

これらの結果、可動片４のくびれ部４９の中央領域において、樹脂ベース７１の当接部７４の端縁近傍７４ｂ、位置決め部７５の中間側壁７５ａ及びカバー部材７２の段部７７の底壁７７ｂによって構成される窓７６の窓枠と可動片４のくびれ部４９の中央領域との隙間が一周に亘って連続的に塞がれることになる。その一方で、収容部７３及び開口７３ａ，７３ｂの周辺において、樹脂ベース７１とカバー部材７２とが溶着されることにより、両者が隙間なく密着されるので、ケース７の外部雰囲気に対する収容部７３を含むケース７の内部空間の密閉性は、極めて高く確保される。なお、第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃの突出量は、窓７６の窓枠と可動片４との隙間、すなわち当接部７４，７９及び中間側壁７５ａと可動片４のくびれ部４９との隙間が一周に亘って連続的に塞がれるように、適宜設定されている。溶融した第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃは、痕跡として残る。例えば、***していた各リブの樹脂が溶融して流れ込んだ部位と、その周辺の平坦部位との境界、又は各リブの樹脂が溶融して流れ込んだ部位同士の境界が、筋状の痕跡として残り、ルーペ、拡大鏡、顕微鏡等を用いることにより、それらの痕跡が確認され得る。なお、図６（ｃ）においては、溶融した第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃの痕跡が存在する位置を破線で示している。   As a result, in the central region of the constricted portion 49 of the movable piece 4, the vicinity of the edge 74 b of the contact portion 74 of the resin base 71, the intermediate side wall 75 a of the positioning portion 75, and the bottom wall 77 b of the stepped portion 77 of the cover member 72. The gap between the window frame of the configured window 76 and the central region of the constricted portion 49 of the movable piece 4 is continuously closed over the entire circumference. On the other hand, since the resin base 71 and the cover member 72 are welded to each other in the vicinity of the housing portion 73 and the openings 73a and 73b, the two are brought into close contact with each other. The airtightness of the internal space of the containing case 7 is ensured extremely high. The protruding amount of the first rib 77a, the second rib 75b, and the third rib 77c is the gap between the window frame of the window 76 and the movable piece 4, that is, the contact portions 74 and 79 and the intermediate side wall 75a and the movable piece 4. It is appropriately set so that the gap with the constricted portion 49 is continuously closed over the entire circumference. The melted first rib 77a, second rib 75b, and third rib 77c remain as traces. For example, the boundary between the part where the resin of each raised rib melted and flowed and the flat part around it, or the boundary between the parts where the resin of each rib melted and flowed as streaky traces By using a loupe, a magnifying glass, a microscope, and the like, the traces thereof can be confirmed. In FIG. 6C, the positions where the traces of the melted first rib 77a, second rib 75b, and third rib 77c exist are indicated by broken lines.

また、可動片４の係合部４８から可動接点３の接触箇所（図１及び図２参照）までの距離と、樹脂ベース７１の位置決め部７５から固定接点２１の接触箇所（図１及び図２参照）までの距離とは、平面視で等しく設定さている。そのため、可動片４が正確に位置決めされると、可動接点３と固定接点２１とが適正な接触箇所で接触する。これにより、通電時における両者間の接触抵抗が適正化される。   Further, the distance from the engaging portion 48 of the movable piece 4 to the contact location of the movable contact 3 (see FIGS. 1 and 2) and the contact location of the fixed contact 21 from the positioning portion 75 of the resin base 71 (FIGS. 1 and 2). The distance to (see) is set equal in plan view. Therefore, when the movable piece 4 is accurately positioned, the movable contact 3 and the fixed contact 21 come into contact with each other at an appropriate contact location. Thereby, the contact resistance between both at the time of electricity supply is optimized.

本実施形態においては、係合部４８及び位置決め部７５が可動片４の短手方向に沿って、それぞれ一対設けられる。さらに、一対の係合部４８及び一対の位置決め部７５は、可動片４の短手方向において斜面４７、斜面７８を挟んで外側の部分に位置しているので、可動片４の回転による樹脂ベース７１とのずれを抑制できる。また、これにより、可動片４の先端部と樹脂ベース７１の開口７３ｂとのクリアランスを小さく設定しても、可動片４の先端部と樹脂ベース７１との干渉を防止できるので、樹脂ベース７１のさらなる小型化を図ることができる。   In the present embodiment, a pair of engaging portions 48 and positioning portions 75 are provided along the short direction of the movable piece 4. Further, since the pair of engaging portions 48 and the pair of positioning portions 75 are positioned on the outer side of the slope 47 and the slope 78 in the short direction of the movable piece 4, the resin base due to the rotation of the movable piece 4. Deviation from 71 can be suppressed. This also prevents interference between the tip of the movable piece 4 and the resin base 71 even if the clearance between the tip of the movable piece 4 and the opening 73b of the resin base 71 is set small. Further downsizing can be achieved.

また、樹脂ベース７１にカバー部材７２が装着されて超音波溶着されるとき、樹脂ベース７１の突起７４ａの先端がカバー部材７２の内壁面と当接し接合される。これに伴い、可動片４が、貫通穴４５の周辺すなわち固定部４２において、樹脂ベース７１及びカバー部材７２によって上下方向から強固に接合される。これにより、可動片４が、樹脂ベース７１に対して定位置（あるべき位置）で固定される。なお、カバー部材７２が樹脂ベース７１に溶着され、可動片４が固定された後も、斜面４７と斜面７８とは当接状態を維持し、可動片４は、矢印Ａ方向に押され続ける。また、これに伴い、位置決め部７５と係合部４８とは係合状態を維持し、樹脂ベース７１に対する可動片４の位置及び姿勢は、正常に維持され続ける。   Further, when the cover member 72 is attached to the resin base 71 and is ultrasonically welded, the tip of the protrusion 74 a of the resin base 71 is brought into contact with and joined to the inner wall surface of the cover member 72. Accordingly, the movable piece 4 is firmly joined from above and below by the resin base 71 and the cover member 72 around the through hole 45, that is, at the fixed portion 42. Thereby, the movable piece 4 is fixed at a fixed position (position where it should be) with respect to the resin base 71. Even after the cover member 72 is welded to the resin base 71 and the movable piece 4 is fixed, the inclined surface 47 and the inclined surface 78 remain in contact with each other, and the movable piece 4 continues to be pushed in the direction of arrow A. Accordingly, the positioning portion 75 and the engaging portion 48 maintain the engaged state, and the position and posture of the movable piece 4 with respect to the resin base 71 are maintained normally.

また、第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃによって、当接部７４，７９及び中間側壁７５ａと可動片４のくびれ部４９とが一周に亘って連続的に隙間なく強固に接合されるので、ケース７の強度・剛性が高められると共に、ケース７に対する可動片４の接合強度が高められる。本実施形態にあっては、このような第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃによる作用効果と相まって、突起７４ａの頂部及び位置決め部７５の頂部が、カバー部材７２の裏面（下面）に接合され補強部として機能する。これにより、固定部４２の中央近傍において、突起７４ａとカバー部材７２が直接的に接合されるので、ケース７の剛性を効率よく高めることができる。同様に、位置決め部７５が、平面視でくびれ部４９の近傍の切除された部分においてカバー部材７２と直接的に接合されるので、くびれ部４９の近傍においてケース７の剛性を効率よく高めることができる。   Further, the first ribs 77a, the second ribs 75b, and the third ribs 77c firmly and continuously join the contact portions 74 and 79 and the intermediate side wall 75a and the constricted portion 49 of the movable piece 4 without a gap. Therefore, the strength and rigidity of the case 7 are increased, and the bonding strength of the movable piece 4 to the case 7 is increased. In the present embodiment, coupled with the effects of the first rib 77a, the second rib 75b, and the third rib 77c, the top of the protrusion 74a and the top of the positioning portion 75 are connected to the back surface (the bottom surface of the cover member 72). ) And functions as a reinforcing part. Thereby, since the protrusion 74a and the cover member 72 are directly joined in the vicinity of the center of the fixed portion 42, the rigidity of the case 7 can be efficiently increased. Similarly, since the positioning portion 75 is directly joined to the cover member 72 at the cut-out portion near the constricted portion 49 in plan view, the rigidity of the case 7 can be efficiently increased near the constricted portion 49. it can.

以上のように、本実施形態のブレーカー１によれば、可動片４と当接して可動片４を保持する当接部７４，７９に形成されている第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃによって、可動片４とケース７の当接部７４，７９との間の微小な隙間を塞ぐことができ、これにより、ケース７の密閉性を向上させて、熱応動素子５の腐食や可動片４の動作不良などの不具合を抑制することができる。   As described above, according to the breaker 1 of the present embodiment, the first rib 77a, the second rib 75b, and the second rib formed on the contact portions 74 and 79 that contact the movable piece 4 and hold the movable piece 4 are used. The three ribs 77c can close a minute gap between the movable piece 4 and the contact portions 74 and 79 of the case 7, thereby improving the sealing property of the case 7 and corroding the heat-responsive element 5. And problems such as malfunction of the movable piece 4 can be suppressed.

特に、カバー部材７２が、可動片４の表面と当接する第１リブ７７ａを有するので、可動片４の表面とカバー部材７２の当接部７９との間の隙間を塞ぐことができる。本実施形態においては、可動片４の短手方向にくびれ部４９両端縁に亘って第１リブ７７ａが形成されているので、側面に比べて面積の大きいくびれ部４９の表面及び裏面の隙間をより確実に塞ぐことができる。   In particular, since the cover member 72 has the first rib 77 a that comes into contact with the surface of the movable piece 4, the gap between the surface of the movable piece 4 and the contact portion 79 of the cover member 72 can be closed. In the present embodiment, since the first rib 77a is formed across the both edges of the constricted portion 49 in the short direction of the movable piece 4, the gap between the front surface and the back surface of the constricted portion 49 having a larger area than the side surface is provided. It can be blocked more reliably.

また、樹脂ベース７１が、位置決め部７５の中間側壁７５ａに可動片４の側面と当接する第２リブ７５ｂを有するので、可動片４の側面と樹脂ベース７１の中間側壁７５ａとの間の隙間を塞ぐことができる。さらに、カバー部材７２が、樹脂ベース７１の第２リブ７５ｂに当接する第３リブ７７ｃを有するので、第２リブ７５ｂの近傍における樹脂ベース７１とカバー部材７２との隙間を第３リブ７７ｃによって塞ぐことができる。   Further, since the resin base 71 has the second rib 75b that contacts the side surface of the movable piece 4 on the intermediate side wall 75a of the positioning portion 75, a gap between the side surface of the movable piece 4 and the intermediate side wall 75a of the resin base 71 is formed. Can be closed. Further, since the cover member 72 has the third rib 77c that contacts the second rib 75b of the resin base 71, the gap between the resin base 71 and the cover member 72 in the vicinity of the second rib 75b is closed by the third rib 77c. be able to.

また、樹脂ベース７１にカバー部材７２が装着されて超音波溶着されるとき、第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃは、摩擦熱により溶融し、可動片４のくびれ部４９、樹脂ベース７１の中間側壁７５ａ及びカバー部材７２の側壁７７ｄに合致する形状に変形する。これにより、ケース７の密閉性をより一層高めることができる。   When the cover member 72 is attached to the resin base 71 and is ultrasonically welded, the first rib 77a, the second rib 75b, and the third rib 77c are melted by frictional heat, and the constricted portion 49 of the movable piece 4 The resin base 71 is deformed into a shape that matches the intermediate side wall 75 a of the resin base 71 and the side wall 77 d of the cover member 72. Thereby, the airtightness of case 7 can be improved further.

また、第１リブ７７ａの稜線と第２リブ７５ｂの稜線とが、少なくとも一部において同一平面上に配設されているので、樹脂ベース７１にカバー部材７２が装着されることにより、可動片４の周方向（短手方向及び厚み方向）に第１リブ７７ａと第２リブ７５ｂが連続して配置されることになり、ケース７の密閉性をより一層向上させることができる。   Further, since the ridge line of the first rib 77a and the ridge line of the second rib 75b are at least partially disposed on the same plane, the movable piece 4 is mounted by attaching the cover member 72 to the resin base 71. Thus, the first rib 77a and the second rib 75b are continuously arranged in the circumferential direction (short direction and thickness direction), and the sealing performance of the case 7 can be further improved.

（変形例）
図７及び図８は、第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃの変形例を示す。両図において（ａ）及び（ｂ）は、図４における（ａ）及び（ｂ）に対応する。図４に示す第１リブ７７ａ、第２リブ７５ｂ、第３リブ７７ｃは、当接部７４、当接部７９のうち可動片４のくびれ部４９と当接する領域に形成されているのに対して、図７に示す第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃは、当接部７４、当接部７９のうち、より収容部７３に接近して、可動片４のくびれ部４９から固定部４２に亘って当接する領域に設けられている。例えば、第２リブ７５ｂは、位置決め部７５の内側壁７５ｄに設けられている。また、図８に示す第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃは、それよりもさらに収容部７３に接近して、可動片４の固定部４２と当接する領域に設けられている。例えば、第２リブ７５ｂは、当接部７４の側壁７４ｃ（樹脂ベース７１の内側壁）に設けられている。また、第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃの稜線は、それぞれ可動片４の長手方向に垂直な同一平面上に配設されている。 (Modification)
7 and 8 show modifications of the first rib 77a, the second rib 75b, and the third rib 77c. In both figures, (a) and (b) correspond to (a) and (b) in FIG. The first rib 77a, the second rib 75b, and the third rib 77c shown in FIG. 4 are formed in regions of the contact portion 74 and the contact portion 79 that contact the constricted portion 49 of the movable piece 4. The first rib 77a, the second rib 75b, and the third rib 77c shown in FIG. 7 are closer to the housing portion 73 of the contact portion 74 and the contact portion 79, and the constricted portion 49 of the movable piece 4 To the fixed portion 42. For example, the second rib 75 b is provided on the inner wall 75 d of the positioning portion 75. Further, the first rib 77 a, the second rib 75 b, and the third rib 77 c shown in FIG. 8 are provided in a region that is closer to the housing portion 73 and abuts on the fixed portion 42 of the movable piece 4. . For example, the second rib 75 b is provided on the side wall 74 c (the inner side wall of the resin base 71) of the contact portion 74. The ridge lines of the first rib 77 a, the second rib 75 b, and the third rib 77 c are arranged on the same plane perpendicular to the longitudinal direction of the movable piece 4.

このように、第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃが形成される場所は、当接部７４、当接部７９のうちケース７の外壁から収容部７３に至るまでの領域であればよい。かかる収容部７３の手前の領域に第１リブ７７ａ、第２リブ７５ｂ及び第３リブ７７ｃを形成して可動片４の周方向に一周に亘って連続して隙間が生じないように密閉し、収容部７３をケース７の外部から遮蔽することによって、熱応動素子５を腐食等から保護できるからである。   Thus, the place where the first rib 77a, the second rib 75b, and the third rib 77c are formed is the region from the outer wall of the case 7 to the housing portion 73 in the contact portion 74 and the contact portion 79. I just need it. The first rib 77a, the second rib 75b, and the third rib 77c are formed in a region in front of the accommodating portion 73 so that the gap is not continuously generated over the circumference of the movable piece 4, This is because the heat-responsive element 5 can be protected from corrosion or the like by shielding the housing 73 from the outside of the case 7.

また、第１リブ７７ａに加えて又は第１リブ７７ａの替わりに、樹脂ベース７１の当接部７４の端縁近傍７４ｂから突出し、可動片４のくびれ部４９の裏面と当接する第４リブ（第１突出部）が形成されていてもよい。この場合、樹脂ベース７１又はカバー部材７２のいずれか一方又は両方に付与された超音波振動によって、第４リブが可動片４の裏面との間に生ずる摩擦熱により溶融し、樹脂ベース７１の当接部７４と可動片４の裏面との隙間が塞がれる。   Further, in addition to the first rib 77a or instead of the first rib 77a, a fourth rib protruding from the vicinity 74b of the contact portion 74 of the resin base 71 and contacting the back surface of the constricted portion 49 of the movable piece 4 ( 1st protrusion part) may be formed. In this case, the fourth rib is melted by the frictional heat generated between the resin base 71 and the cover member 72 and the back surface of the movable piece 4 due to the ultrasonic vibration applied to one or both of the resin base 71 and the cover member 72. A gap between the contact portion 74 and the back surface of the movable piece 4 is closed.

なお、本発明は上記実施形態の構成に限られることなく、少なくともケース７が、熱応動素子５を収容する収容部７３と、収容部７３の外側に設けられ、可動片４の弾性部４３と端子４１との間において可動片４と当接して可動片４を保持する当接部７９等を有し、当接部７９等には、可動片４の側に突出する突出部７７ａ等が形成されていればよい。   The present invention is not limited to the configuration of the above-described embodiment, and at least the case 7 is provided on the outer side of the accommodating portion 73 that accommodates the thermally responsive element 5, and the elastic portion 43 of the movable piece 4. A contact portion 79 that contacts the movable piece 4 and holds the movable piece 4 between the terminal 41 and the like is provided, and the contact portion 79 is formed with a protruding portion 77a that protrudes toward the movable piece 4 side. It only has to be done.

また、本発明は、上記変形例の他、種々の変形が可能である。例えば、図４、図７及び図８においては、第２リブ７５ｂと第３リブ７７ｃの稜線が、可動片４の長手方向に垂直な同一平面上に配設されている形態が示されているが、第３リブ７７ｃが、第２リブ７５ｂに対して、可動片４の弾性部４３の側又は端子４１の側にずれて配設され、第２リブ７５ｂと第３リブ７７ｃとが可動片４の長手方向に相補的な形状に形成されている形態であってもよい。この形態であっても、第２リブ７５ｂと第３リブ７７ｃとは、平面視で一部において重複し、樹脂ベース７１又はカバー部材７２のいずれか一方又は両方に付与された超音波振動によって、第２リブ７５ｂと第３リブ７７ｃとの接触部位が摩擦熱により溶融し、樹脂ベース７１とカバー部材７２との隙間が塞がれる。このような、第３リブ７７ｃが、第２リブ７５ｂに対して、可動片４の弾性部４３の側又は端子４１の側に配設されている形態によれば、ケース７の窓７６から異物の侵入する方向（可動片４の長手方向）に第２リブ７５ｂと第３リブ７７ｃが連続して配置されるので、異物の侵入が抑制され、ケース７の密閉性をより一層向上させることができる。   Further, the present invention can be variously modified in addition to the above modified examples. For example, FIGS. 4, 7, and 8 show a form in which the ridgelines of the second rib 75 b and the third rib 77 c are arranged on the same plane perpendicular to the longitudinal direction of the movable piece 4. However, the third rib 77c is disposed so as to be shifted to the elastic portion 43 side or the terminal 41 side of the movable piece 4 with respect to the second rib 75b, and the second rib 75b and the third rib 77c are movable pieces. 4 may be formed in a complementary shape in the longitudinal direction. Even in this form, the second rib 75b and the third rib 77c partially overlap in plan view, and by ultrasonic vibration applied to one or both of the resin base 71 and the cover member 72, The contact portion between the second rib 75b and the third rib 77c is melted by frictional heat, and the gap between the resin base 71 and the cover member 72 is closed. According to such a configuration in which the third rib 77c is disposed on the elastic part 43 side of the movable piece 4 or the terminal 41 side with respect to the second rib 75b, the foreign matter is introduced from the window 76 of the case 7. Since the second ribs 75b and the third ribs 77c are continuously arranged in the direction in which the material enters (the longitudinal direction of the movable piece 4), the intrusion of foreign matter is suppressed and the sealing performance of the case 7 can be further improved. it can.

また、可動片４において、第１リブ７７ａ及び／又は第２リブ７５ｂと当接する部位に、第１リブ７７ａ及び／又は第２リブ７５ｂの突出形状に対応する凹部を設けてもよい。この形態によれば、凹部に第１リブ７７ａ及び／又は第２リブ７５ｂが嵌合されることにより、ケース７の密閉性と可動片４とケース７との接合強度をより一層向上させることができる。   Moreover, in the movable piece 4, you may provide the recessed part corresponding to the protrusion shape of the 1st rib 77a and / or the 2nd rib 75b in the site | part which contact | abuts with the 1st rib 77a and / or the 2nd rib 75b. According to this embodiment, the first rib 77a and / or the second rib 75b are fitted into the recess, thereby further improving the sealing property of the case 7 and the bonding strength between the movable piece 4 and the case 7. it can.

また、図４、図７及び図８においては、可動片４は、貫通穴４５、段曲げ部４６、斜面４７、係合部４８及びくびれ部４９（図１等参照）の構成を有する形態であるが、これらの構成うちのいずれか又は全てが廃されていてもよい。例えば、貫通穴４５を廃する場合は、樹脂ベース７１の突起７４ａも廃される。また、段曲げ部４６、斜面４７が廃される場合は、可動片４は平面状に形成され、樹脂ベース７１の当接部７４及びカバー部材７２の当接部７９が平坦な形状となる。この構成においては、段曲げ部４６及び斜面４７を廃することにより、可動片４及び樹脂ベース７１の長手方向の寸法を小さくして、ブレーカー１のさらなる小型化を図ることができる。なお、可動片４の段曲げ部４６及び斜面４７は、必要に応じて樹脂ベース７１の外部に設けられていてもよい。また、係合部４８及びくびれ部４９が廃される場合は、可動片４は、固定部４２から端子４１に亘って等幅に形成され、これに伴い樹脂ベース７１の位置決め部７５の形状も変更される。   4, 7, and 8, the movable piece 4 has a configuration of a through hole 45, a step bending portion 46, a slope 47, an engagement portion 48, and a constricted portion 49 (see FIG. 1 and the like). However, any or all of these configurations may be eliminated. For example, when the through hole 45 is discarded, the projection 74a of the resin base 71 is also discarded. Further, when the stepped portion 46 and the slope 47 are eliminated, the movable piece 4 is formed in a flat shape, and the contact portion 74 of the resin base 71 and the contact portion 79 of the cover member 72 are flat. In this configuration, by eliminating the step bending portion 46 and the slope 47, the size of the movable piece 4 and the resin base 71 in the longitudinal direction can be reduced, and the breaker 1 can be further downsized. The step bending portion 46 and the slope 47 of the movable piece 4 may be provided outside the resin base 71 as necessary. Further, when the engaging portion 48 and the constricted portion 49 are eliminated, the movable piece 4 is formed to have a uniform width from the fixed portion 42 to the terminal 41, and accordingly, the shape of the positioning portion 75 of the resin base 71 is also changed. Be changed.

また、樹脂ベース７１とカバー部材７２との接合手法は、超音波溶着に限られることなく、両者が隙間なく強固に接合される手法であれば、適宜適用することができる。また、ケース７は、樹脂ベース７１とカバー部材７２等によって構成される形態に限られることなく、２個以上の部品によって可動片４が挟まれて保持される形態であればよい。この場合、一方が第１ケース、他方が第２ケースとなる。   Moreover, the joining method of the resin base 71 and the cover member 72 is not limited to ultrasonic welding, and can be appropriately applied as long as both are firmly joined without a gap. Further, the case 7 is not limited to the form constituted by the resin base 71 and the cover member 72 and the like, but may be any form as long as the movable piece 4 is sandwiched and held by two or more parts. In this case, one is the first case and the other is the second case.

また、可動片４と樹脂ベース７１とカバー部材７２との接合部位において、可動片４及び／又は樹脂ベース７１、カバー部材７２の表面を梨地加工やヘアライン加工等により粗面化処理してもよい。この場合にあっては、両者間で初期に発生する摩擦熱が大きくなり、第１リブ７７ａ、第２リブ７５ｂ、第３リブ７７ｃの溶融が促進され、ケース７の密閉性をより一層向上させることができる。   Further, the surface of the movable piece 4 and / or the resin base 71 and the cover member 72 may be roughened by a satin finish, a hairline process or the like at the joint portion between the movable piece 4, the resin base 71 and the cover member 72. . In this case, the frictional heat initially generated between the two is increased, the melting of the first rib 77a, the second rib 75b, and the third rib 77c is promoted, and the sealing performance of the case 7 is further improved. be able to.

また、第１リブ７７ａ、第２リブ７５ｂ、第３リブ７７ｃの形状は、図４、図７及び図８に示したものに限られない。可動片４、樹脂ベース７１、カバー部材７２の間に生ずる隙間を塞ぐように、連続的又は断続的に突出する形状であれば、特に限定されない。   Moreover, the shape of the 1st rib 77a, the 2nd rib 75b, and the 3rd rib 77c is not restricted to what was shown in FIG.4, FIG.7 and FIG.8. The shape is not particularly limited as long as the shape projects continuously or intermittently so as to close a gap generated between the movable piece 4, the resin base 71, and the cover member 72.

また、本実施形態では、ＰＴＣサーミスター６による自己保持回路を有しているが、このような構成を省いた形態であっても適用可能であり、導通抵抗を抑制しつつ、ブレーカー１の小型化を図ることができる。また、可動片４をバイメタル又はトリメタル等によって形成することにより、可動片４と熱応動素子５を一体的に形成する構成であってもよい。この場合、ブレーカーの構成が簡素化されて、さらなる小型化を図ることができる。   In the present embodiment, the self-holding circuit using the PTC thermistor 6 is provided. However, the present invention can be applied to a configuration in which such a configuration is omitted, and the breaker 1 can be reduced in size while suppressing conduction resistance. Can be achieved. Moreover, the structure which forms the movable piece 4 and the thermally responsive element 5 integrally by forming the movable piece 4 with a bimetal or a trimetal etc. may be sufficient. In this case, the configuration of the breaker is simplified, and further miniaturization can be achieved.

また、特開２００５−２０３２７７号公報に示されるような、固定部４２又はその近傍において、端子４１の側と可動接点３の側に構造的に分離されている形態に、本発明を適用してもよい。   Further, the present invention is applied to a form in which the fixed portion 42 or the vicinity thereof is structurally separated into the terminal 41 side and the movable contact 3 side as shown in JP-A-2005-203277. Also good.

１ ブレーカー
２ 固定片
３ 可動接点
４ 可動片
５ 熱応動素子
７ ケース
２１ 固定接点
４１ 端子
４３ 弾性部
４５ 貫通穴
４９ くびれ部
７１ 樹脂ベース
７２ カバー部材
７３ 収容部
７４ 当接部
７４ａ 突起
７５ｂ 第２リブ（第２突出部）
７７ａ 第１リブ（第１突出部）
７７ｃ 第３リブ（第３突出部）
７９ 当接部 DESCRIPTION OF SYMBOLS 1 Breaker 2 Fixed piece 3 Movable contact 4 Movable piece 5 Thermally responsive element 7 Case 21 Fixed contact 41 Terminal 43 Elastic part 45 Through hole 49 Constriction part 71 Resin base 72 Cover member 73 Storage part 74 Contact part 74a Protrusion 75b 2nd rib (Second protrusion)
77a 1st rib (1st protrusion part)
77c 3rd rib (3rd protrusion part)
79 Contact part

Claims (9)

固定接点を有する固定片と、
弾性変形する弾性部と該弾性部の先端部に可動接点とを有し、前記可動接点を前記固定接点に押圧して接触させる可動片と、
温度変化に伴って変形することにより前記可動接点が前記固定接点から離反するように前記可動片を作動させる熱応動素子と、
前記固定片、可動片及び熱応動素子を収容するケースとを備えたブレーカーにおいて、
前記可動片は、前記ケースの外部に露出されて外部回路と電気的に接続される端子を有し、
前記ケースは、前記熱応動素子を収容する収容部と、前記収容部の外側に設けられ、前記弾性部と前記端子との間において前記可動片と当接して該可動片を保持する当接部を有し、前記当接部には、前記可動片の側に突出する突出部が形成されていることを特徴とするブレーカー。 A fixed piece having a fixed contact;
A movable piece having an elastic part that is elastically deformed and a movable contact at a tip of the elastic part, and pressing the movable contact against the fixed contact;
A thermally responsive element that operates the movable piece so that the movable contact is separated from the fixed contact by being deformed with a temperature change;
In the breaker comprising the fixed piece, the movable piece, and a case for accommodating the thermally responsive element,
The movable piece has a terminal exposed to the outside of the case and electrically connected to an external circuit,
The case includes a housing portion that houses the thermally responsive element, and an abutting portion that is provided outside the housing portion and abuts the movable piece between the elastic portion and the terminal to hold the movable piece. The breaker is characterized in that a protrusion projecting toward the movable piece is formed in the contact portion. 前記可動片は、板状材料から形成され、
前記ケースは、前記可動接点が形成されている前記可動片の裏面側に配設され、前記収容部が形成された第１ケースと、前記可動片の表面側に配設され、前記第１ケースに装着される第２ケースとを有し、
前記第１ケース又は第２ケースのうちの少なくとも一方は、前記可動片の裏面又は表面に当接する第１突出部を有することを特徴とする請求項１に記載のブレーカー。 The movable piece is formed of a plate-shaped material,
The case is disposed on the back side of the movable piece on which the movable contact is formed, and is disposed on the front side of the movable piece, the first case on which the housing portion is formed, and the first case. A second case attached to the
2. The breaker according to claim 1, wherein at least one of the first case and the second case has a first protrusion that abuts against a back surface or a front surface of the movable piece. 前記第１ケース又は第２ケースのうちの他方は、前記可動片の側面に当接する第２突出部を有することを特徴とする請求項２に記載のブレーカー。   3. The breaker according to claim 2, wherein the other of the first case and the second case has a second protrusion that contacts the side surface of the movable piece. 前記第１突出部の稜線と前記第２突出部の稜線とは、少なくとも一部において同一平面上に配設されていることを特徴とする請求項３に記載のブレーカー。   4. The breaker according to claim 3, wherein the ridge line of the first protrusion and the ridge line of the second protrusion are arranged on the same plane at least in part. 前記第１ケース又は第２ケースのうちの一方は、前記他方の第２突出部に当接する第３突出部を有することを特徴とする請求項３又は請求項４に記載のブレーカー。   5. The breaker according to claim 3, wherein one of the first case and the second case has a third projecting portion that abuts on the other second projecting portion. 6. 前記第３突出部は、前記第２突出部に対して、前記可動片の弾性部の側又は端子の側に配設されていることを特徴とする請求項５に記載のブレーカー。   The breaker according to claim 5, wherein the third projecting portion is disposed on the elastic portion side or the terminal side of the movable piece with respect to the second projecting portion. 前記可動片は、前記第１突出部及び／又は前記第２突出部に対応する凹部を有することを特徴とする請求項２乃至請求項６のいずれか一項に記載のブレーカー。   The breaker according to any one of claims 2 to 6, wherein the movable piece has a recess corresponding to the first protrusion and / or the second protrusion. 請求項１乃至請求項７に記載のブレーカーを備えたことを特徴とする電気機器用の安全回路。   A safety circuit for an electric device comprising the breaker according to claim 1. 請求項１乃至請求項７に記載のブレーカーを備えたことを特徴とする２次電池パック。   A secondary battery pack comprising the breaker according to claim 1.
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JPH05187045A (en) * 1991-06-26 1993-07-27 Sansei Denki Kk Temperature detector for water pipe freezing prevention belt and manufacture thereof
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JP2015088361A (en) * 2013-10-31 2015-05-07 株式会社小松ライト製作所 Circuit breaker, and safety circuit and rechargeable battery pack each equipped with the same
US20170179462A1 (en) 2015-12-18 2017-06-22 Bourns, Inc. Battery housing
US10439196B2 (en) 2015-12-18 2019-10-08 Bourns, Inc. Electromechanical circuit breaker
US10707475B2 (en) 2015-12-18 2020-07-07 Bourns, Inc. Battery housing
US10985552B2 (en) 2018-06-22 2021-04-20 Bourns, Inc. Circuit breakers
US11651922B2 (en) 2019-08-27 2023-05-16 Bourns, Inc. Connector with integrated thermal cutoff device for battery pack

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