JP3860441B2

JP3860441B2 - Load detection device

Info

Publication number: JP3860441B2
Application number: JP2001237607A
Authority: JP
Inventors: 良一前田; 博文奥村; 克巳吉川
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2001-06-08
Filing date: 2001-08-06
Publication date: 2006-12-20
Anticipated expiration: 2021-08-06
Also published as: JP2003057132A

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車の座席に使用して好適な荷重検出装置に関する。
【０００２】
【従来の技術】
従来の荷重検出装置の構成を図６，図７に基づいて説明すると、金属板からなる支持部材５１には、台座部５２が設けられている。
歪み検出部材５３は、板状の絶縁基板、或いは表面に絶縁層が設けられた金属板等からなる基体５４と、この基体５４の中央部の表面に設けられた抵抗体等からなる複数の歪み素子５５とで構成され、この歪み検出部材５３は、基体５４の一端部が台座部５２上に載置された状態で、ネジ部材５６により支持部材５１に取り付けられると共に、基体５４の中央部と他端部が支持部材５１から浮いた状態で取り付けられている。
【０００３】
金属板からなる荷重伝達部材５７には、一端側に台座部５８が設けられ、この荷重伝達部材５７は、台座部６８を基体５４の他端部側に載置した状態で、ネジ部材５９により基体５４の他端側に取り付けられると共に、荷重伝達部材５７が基体５４と対向した状態で配置されている。
【０００４】
次に、このように構成された従来の荷重検出装置の動作を説明すると、先ず、基体５４の一端側に位置する荷重伝達部材５７の他端側において、荷重伝達部材５７を下方に押圧するような矢印Ａ方向の荷重がかかると、台座部５８を介して基体５４の他端部が押圧される。
すると、基体５４は、もう一方の台座部５２を支点として下方に撓み、その結果、基体５４の上面に設けられた歪み素子５５は伸び、そして、この歪み素子５５の伸びの量を電気的に検出して、荷重を測定するようになっている。
【０００５】
また、基体５４の一端側に位置する荷重伝達部材５７の他端側において、荷重伝達部材５７を上方に牽引するような矢印Ｂ方向の荷重がかかると、台座部５８を介して基体５４の他端部が牽引される。
すると、基体５４は、もう一方の台座部５２の支点として上方に撓み、その結果、基体５４の上面に設けられた歪み素子５５は縮み、そして、この歪み素子５５の伸びの量を電気的に検出して、荷重を測定するようになっている。
【０００６】
そして、このような構成の荷重検出装置を自動車の座席にする場合は、図６に示すように、支持部材５１が車体に設けられたガイド部材６０をガイドして移動可能な移動体６１に取り付けられると共に、荷重伝達部材５７の他端部には、座席６２の下部がしっかりと固定されている。
また、このような荷重検出装置は、座席６２の前方と後方の左右２カ所の計４個が配設され、４個の荷重検出装置のそれぞれに座席６２がしっかりと固定され、この４個の荷重検出装置によって、座席６２自体の荷重を支えたものとなっている。
【０００７】
しかし、荷重検出装置への座席６２の取付位置の水平度にはバラツキがあり、このため、座席６２を荷重検出装置に固定した際、少なくとも２カ所、或いは３カ所の荷重検出装置の位置では座席６２が水平となるが、残りの位置では、座席６２の取付位置が下方、或いは上に位置した状態となり、取付位置にバラツキが生じたものとなっている。
【０００８】
このため、バラツキのある取付位置で、座席６２を荷重検出装置に固定すると、荷重伝達部材５７がネジ部材５９により歪み検出部材５３に固定、結合されているため、荷重伝達部材５７が座席６２の取付位置側に移動する。
即ち、水平の位置にある２カ所、或いは３カ所に配置された荷重検出装置を基準にして、バラツキのある箇所では、荷重伝達部材５７が上方、或いは下方に移動して、基準位置にある荷重検出装置よりも歪み検出部材４３が撓んだ状態となって、バラツキの位置にある荷重検出装置の基準値がバラツキを生じる。
【０００９】
また、座席６２によって、荷重伝達部材５７が矢印Ａ方向に押圧された際、歪み検出部材５３の他端が支持部材５１に当接して、歪み検出部材５３の移動をストップするようになるが、この時、この当接により基体５４が変形、破損したり或いは、荷重伝達部材５７が必要以上に押されて、変形する等の事態が生じるものであった。
【００１０】
【発明が解決しようとする課題】
従来の荷重検出装置において、荷重伝達部材５７がネジ部材５９により歪み検出部材５３に固定、結合されているため、荷重伝達部材５７が座席６２に取り付けられた際、座席６２の取付位置でバラツキのある箇所では、荷重伝達部材５７が上方、或いは下方に移動して、基準位置にある荷重検出装置よりも歪み検出部材５３が撓んだ状態となって、バラツキの位置にある荷重検出装置の基準値がバラツキを生じ、荷重測定の精度が悪くなるという問題がある。
【００１１】
また、座席６２によって、荷重伝達部材５７が矢印Ａ方向に押圧された際、歪み検出部材５３の他端が支持部材５１に当接して、歪み検出部材５３の移動をストップするようになるが、この時、この当接により基体５４が変形、破損したり或いは、荷重伝達部材５７が必要以上に押されて変形する等の事態が生じるものであった。
【００１２】
そこで、本発明は基準値の設定が確実で、測定精度の良好な荷重検出装置を提供することを目的とする。
【００１３】
【課題を解決するための手段】
上記課題を解決するための第１の解決手段として、支軸を支点として回転動作可能なシーソー部材と、歪み素子を有する板状の歪み検出部材と、前記シーソー部材に加えられた荷重を前記歪み検出部材に伝達する荷重伝達部材とを備え、前記荷重伝達部材が前記シーソー部材に取り付けられ、前記荷重伝達部材と前記歪み検出部材とが分離された状態で配設されると共に、前記荷重伝達部材と前記歪み検出部材との間には、前記荷重伝達部材からの荷重を前記歪み検出部材に伝え、前記荷重伝達部材と係合可能な係合部材が設けられ、前記シーソー部材に荷重がかかった時、前記荷重伝達部材と前記係合部材を介して前記歪み検出部材に荷重を伝えて、前記歪み検出部材を撓ますようにした荷重検出装置であって、前記係合部材は、上、下に位置する第１，第２の係合部と、この第１，第２の係合部との間に設けられた孔を有し、前記係合部材は、前記歪み検出部材に取り付けられると共に、前記荷重伝達部材の一端部が、前記孔に前記荷重伝達部材の移動方向に遊びのある状態で挿入されて、前記荷重伝達部材が前記第１、第２の係合部に係合可能とし、前記シーソー部材を支持する前記支軸を挟む位置には、高さ調整可能な一対のストッパー手段を設け、前記シーソー部材が中立位置から時計方向、或いは反時計方向に回転した時、それぞれ前記ストッパー手段によって前記シーソー部材の回転をストップするようにした構成とした。
【００１５】
また、第２の解決手段として、前記シーソー部材の下部には、前記シーソー部材を取り付ける支持部材が配置され、前記支持部材には、前記支軸を挟む位置にネジ部材からなる前記ストッパー手段がねじ込まれ、前記ネジ部材と前記シーソー部材とが衝合して、前記シーソー部材の回転をストップするようにした構成とした。
【００１６】
また、第３の解決手段として、前記シーソー部材の下部には、前記シーソー部材を取り付ける支持部材が配置され、前記シーソー部材には、前記支軸を挟む位置に配置されたネジ部材からなる前記ストッパー手段がねじ込まれ、前記ネジ部材と前記支持部材とが衝合して、前記シーソー部材の回転をストップするようにした構成とした。
また、第４の解決手段として、前記シーソー部材は荷重受け部を有し、前記支持部材の水平線からの前記支軸の中心部までの距離と、前記支持部材からの前記荷重受け部の中心部の距離とを等しくした構成とした。
【００１７】
また、第５の解決手段として、前記荷重伝達部材は、板バネが複数枚積層されて構成された。
また、第６の解決手段として、前記荷重伝達部材を構成する前記板バネは、前記シーソー部材側の幅が広く、前記係合部材側に向かうに従って漸次幅狭に形成した構成とした。
【００１８】
また、第７の解決手段として、支軸を支点として回動可能なシーソー部材と、歪み素子を有する歪み検出部材と、前記シーソー部材に加えられた荷重を前記歪み検出部材に伝達する荷重伝達部材とを備え、前記荷重伝達部材は弾性を有する板材で形成されて前記シーソー部材に取り付けられ、前記歪み検出部材が前記荷重伝達部材の一部に固着された状態で配設されると共に、前記荷重伝達部材と係合可能な係合部材が設けられ、前記シーソー部材に荷重がかかった時、前記荷重伝達部材が前記係合部材と係合し湾曲することで前記歪み検出部材に荷重を伝えて、前記歪み検出部材を撓ますようにした荷重検出装置であって、前記係合部材は、上、下に位置する第１，第２の係合部と、この第１，第２の係合部との間に設けられた孔を有し、前記荷重伝達部材の一端部が前記孔に前記荷重伝達部材の移動方向に遊びのある状態で挿入されて、前記荷重伝達部材が前記第１、第２の係合部に係合可能とし、前記シーソー部材を支持する前記支軸を挟む位置には、高さ調整可能な一対のストッパー手段を設け、前記シーソー部材が中立位置から時計方向、或いは反時計方向に回転した時、それぞれ前記ストッパー手段によって前記シーソー部材の回転をストップするようにした構成とした。
【００１９】
また、第１１の解決手段として、前記荷重伝達部材と前記係合部材との間には、前記荷重伝達部材の移動方向に遊びを持たせた構成とした。
また、第１２の手段として、前記係合部材は、上、下に位置する第１，第２の係合部と、この第１，第２の係合部との間に設けられた孔を有し、前記荷重伝達部材の一端部が前記孔に遊びのある状態で挿入されて、前記荷重伝達部材が前記第１、第２の係合部に係合可能とした構成とした。
【００２０】
また、第８の解決手段として、前記シーソー部材の下部には、前記シーソー部材を取り付ける支持部材が配置され、前記支持部材には、前記支軸を挟む位置にネジ部材からなる前記ストッパー手段がねじ込まれ、前記ネジ部材と前記シーソー部材とが衝合して、前記シーソー部材の回転をストップするようにした構成とした。
【００２１】
また、第９の解決手段として、前記シーソー部材の下部には、前記シーソー部材を取り付ける支持部材が配置され、前記シーソー部材には、前記支軸を挟む位置に配置されたネジ部材からなる前記ストッパー手段がねじ込まれ、前記ネジ部材と前記支持部材とが衝合して、前記シーソー部材の回転をストップするようにした構成とした。
【００２２】
【発明の実施の形態】
本発明の荷重検出装置の図面を説明すると、図１は本発明の荷重検出装置の要部の断面図、図２は本発明の荷重検出装置の分解斜視図、図３は本発明の荷重検出装置の動作を示す説明図である。
【００２３】
次に、本発明の荷重検出装置の構成を図１〜図３に基づいて説明すると、金属板からなる帯状の支持部材１は、長手方向の中心線に沿って設けられた複数の第１，第２，第３，第４のネジ孔１ａ、１ｂ、１ｃ、１ｄと、第１と第２のネジ孔１ａ、１ｂとの間に設けられた比較的大きな円形の孔１ｅとを有する。
【００２４】
歪み検出部材２は、板状の絶縁基板、或いは表面に絶縁層が設けられた金属板等からなる基体３と、この基体３の中央部の表面に設けられた抵抗体等からなる複数の歪み素子４とで構成されている。
そして、歪み素子４は、基体３の長手方向の中央部を挟んで対向する位置に、それぞれ複数個設けられている。
【００２５】
金属材等の強度の強い材料からなる係合部材５は、取付部５ａと、この取付部５ａから垂直方向に延びる板状の腕部５ｂと、この腕部５ｂに設けられた四角状の孔５ｃと、この孔５ｃの上、下に位置する第１，第２の係合部５ｄ、５ｅとを有する。
そして、この係合部材５は、取付部５ａが基体３の長手方向の中央部に固着されて、基体３と一体化され、係合部材５の両側には、歪み素子４が位置した状態となっている。
【００２６】
また、基体３の両端側の上、下面には、それぞれ座板部６が配置され、下方に位置する座板部６が第１，第２のネジ孔１，１ｂの周囲に位置する支持部材１の上面に載置され、座板部６，及び基体３に設けた孔（図示せず）に２個の頭付のネジ部材７を第１，第２のネジ孔１ａ、１ｂにねじ込みして、基体３の中央部が支持部材１の表面から浮いた状態で、基体３の両端部が支持部材１に取り付けられて、両持ち支持となっている。
そして、歪み検出部材２が支持部材１に取り付けられた際、係合部材５の下部は、孔１ｅと対向し、係合部材５が上下に移動した時、この孔１ｅが逃げ孔となって、支持部材１にぶつかるのを防止している。
【００２７】
Ｕ字状をなした金属板等からなる保持部材８は、底壁８ａと、この底壁８ａの両端から垂直方向に延びる一対の側壁８ｂと、互いに対向した位置で、一対の側壁８ｂに設けられた円形の孔８ｃとを有し、この保持部材８は、底壁８ｂが第３，第４のネジ孔１ｃ、１ｄ間の中央部の位置で支持部材１上に配置された状態で、スポット溶接、或いはネジ手段等の固定手段により支持部材１に固着されている。
【００２８】
略直方体状の金属材からなるシーソー部材９は、直方体状の本体部９ａと、本体部９ａの一端側に設けられた幅広の取付部９ｂと、この取付部９ｂの端面側に設けられた凹部９ｃと、長手方向の中央部において、長手方向と直交する方向に設けられた円形の孔９ｄと、この孔９ｄを挟んで、取付部９ｃと反対側に位置し、長手方向と直交する方向に本体部９ａの側部から突出して設けられた荷重受け部９ｅとを有すると共に、荷重受け部９ｅは、金属棒を本体部９ａに圧入する等して形成されている。
【００２９】
そして、このシーソー部材９は、本体部９ａを保持部材８の一対の側壁８ｂ間に位置させ、円柱の支軸１０を保持部材８の孔８ｃとシーソー部材９の孔９ｄに挿通して、支軸１０を支点として回転動作可能に取り付けられている。
このシーソー部材９が取り付けられた際、支軸１０の中心部Ｃ１と、加重受け部９ｅの中心部Ｃ２とは、支持部材１の水平線Ｓから等しい距離Ｋとなっていると共に、本体部９ａの下部には、第３，第４のネジ孔１ｃ、１ｄが対向した状態となっている。
【００３０】
棒状のネジ部材からなる一対のストッパー手段１１は、それぞれ第３，第４のネジ孔１ｃ、１ｄにねじ込みして取り付けられ、ストッパー手段１１のねじ込み、ネジ戻しによって、支持部材１からの高さの調整が可能となっている。
そして、このストッパー手段１１は、支軸１０を挟むように配置されており、荷重受け部９ｅに下方に押圧するような矢印Ａ方向の荷重がかかると、シーソー部材９は反時計方向に回転すると共に、一方のストッパー手段１１にぶつかって、シーソー部材９の回転がストップする。
【００３１】
また、荷重受け部９ｅに上方に牽引するような矢印Ｂ方向の荷重がかかると、シーソー部材９は時計方向に回転すると共に、他方のストッパー手段１１にぶつかって、シーソー部材９の回転がストップする。
なお、ストッパー手段１１は、支持部材１に取り付けたもので説明したが、シーソー部材９に設けたネジ孔にストッパー手段１１をねじ込みして取り付け、このストッパー手段１１を支持部材１に衝合させて、シーソー部材９の回転をストップさせるようにしても良い。
【００３２】
荷重伝達部材１２は、ステンレス材等からなる板バネ１３が複数枚積層されて構成されており、この板バネ１３は、一端部１３ａが幅広で形成されると共に、この一端部１３ａから他端部１３ｂに向かうに従って漸次幅狭になるような台形状で形成されている。
そして、この荷重伝達部材１２は、幅広の一端部１３ａがシーソー部材９の凹部９ｃに圧入する等の方法により取り付けられると共に、荷重伝達部材１２の幅狭の他端部１３ｂは、係合部材５の孔５ｃ内の上下方向に遊びのある状態で挿通されて、荷重伝達部材１２と歪み検出部材２とは互いに分離された状態となっている。
【００３３】
また、係合部５の孔５ｃに遊びのある状態で挿通された荷重伝達部材１２は、シーソー部材９に矢印Ａ方向の荷重がかかった時、シーソー部材９が反時計方向に回転するため、上方に位置する第１の係合部５ｄに係合して、係合部材５を上方に引き上げる。
その結果、歪み検出部材２の基体３が撓むに従って、歪み素子４も撓むようになる。
【００３４】
また、係合部５の孔５ｃに遊びのある状態で挿通された荷重伝達部材１２は、シーソー部材９に矢印Ｂ方向の荷重がかかった時、シーソー部材９が時計方向に回転するため、下方に位置する第２の係合部５ｅに係合して、係合部材５を下方に押し下げる。
その結果、歪み検出部材２の基体３が撓むに従って、歪み素子４も撓むようになる。
【００３５】
次に、このように構成された本発明の荷重検出装置の動作を説明すると、先ず、シーソー部材９に設けられた荷重受け部９ｅを下方に押圧するような矢印Ａ方向の荷重がかかると、シーソー部材９は支軸１０を支点として反時計方向に回転する。
すると、図３に示すように、これに伴って荷重伝達部材１２も反時計方向に回転して、荷重伝達部材１２が上方に位置する第１の係合部５ｄに係合して、係合部材５を上方に引き上げる。
その結果、歪み検出部材２の基体３が撓むと共に、この基体３の撓みに従って、歪み素子４も撓むようになり、そして、この歪み素子４の撓みの量を電気的に検出して、荷重を測定するようになっている。
また、シーソー部材９の反時計方向の回転は、荷重受け部材９ｅ側に位置するストッパー手段１１にぶつかって、その回転がストップするようになる。
【００３６】
また、シーソー部材９に設けられた荷重受け部９ｅを上方に牽引するような矢印Ｂ方向の荷重がかかると、シーソー部材９は支軸１０を支点として時計方向に回転する。
すると、これに伴って荷重伝達部材１２も時計方向に回転して、荷重伝達部材１２が下方に位置する第２の係合部５ｅに係合して、係合部材５を下方に押し下げる。
その結果、歪み検出部材２の基体３が撓むと共に、基体３の撓みに従って、歪み素子４も撓むようになり、そして、この歪み素子４の撓みの量を電気的に検出して、荷重を測定するようになっている。
また、シーソー部材９の時計方向の回転は、荷重伝達部材１２側に位置するストッパー手段１１にぶつかって、その回転がストップするようになる。
【００３７】
そして、このような構成の荷重検出装置を自動車の座席にする場合は、図１に示すように、支持部材１が車体に設けられたガイド部材１４をガイドして移動可能な移動体１５に取り付けられると共に、シーソー部材９に設けられた荷重受け部９ｅには、座席１６の下部がしっかりと固定されている。
【００３８】
また、このような荷重検出装置は、座席１６の前方と後方の左右２カ所の計４個が配設され、４個の荷重検出装置のそれぞれに座席１６がしっかりと固定され、この４個の荷重検出装置によって、座席１６自体の荷重を支えたものとなっている。
そして、座席１６自体の荷重がかかった時、この重みによって、荷重伝達部材１２は、第１の係合部５ｄに当接した状態の中立位置となり、この中立位置では、歪み検出部材２の撓みが生じない状態となっている。
【００３９】
通常、荷重検出装置への座席１６の取付位置の水平度にはバラツキがあり、このため、座席１６を荷重検出装置に固定した際、少なくとも２カ所、或いは３カ所の荷重検出装置の位置では座席１６が水平となるが、残りの位置では、座席１６の取付位置が下方、或いは上に位置した状態となり、取付位置にバラツキが生じたものとなっている。
【００４０】
そして、バラツキのある取付位置で、座席１６を荷重検出装置に固定、即ち、座席１６を荷重受け部９ｅに固定すると、水平の位置にある２カ所、或いは３カ所に配置された荷重受け部９ｅを基準にして、バラツキのある箇所では、荷重受け部９ｅが上方、或いは下方に移動したものとなるが、荷重伝達部材１２と係合部材５との間が遊びのある状態で、係合可能な状態となっているため、歪み検出部材２を撓ませることなく、それぞれの荷重伝達部材１２が第１の係合部５ｄに係合状態、或いは係合可能な状態となる。
従って、中立位置では、全ての歪み検出部材２が撓むことなく、所定の基準値を維持した状態となる。
【００４１】
また、座席１６によって、シーソー部材９が矢印Ａ方向に押圧されたり、或いは矢印Ｂ方向に牽引したりすると、シーソー部材９がそれぞれストッパー手段１１にぶつかって、シーソー部材９の回転がストップされるため、歪み検出部材２，或いは荷重伝達部材１２に不必要な過負荷がかかることが無くなる。
【００４２】
なお、上記実施例では、歪み検出部材２が両持ち支持され、係合部材５が歪み検出部材２の中央部において配置されたもので説明したが、歪み検出部材２が片持ち支持され、片持ちされた側と反対の位置に係合部材５を配置して、歪み検出部材２を撓ますようにしても良い。
【００４３】
図４及び図５は本発明の他の実施例である荷重検出装置の構造を示すもので、図４は本発明の荷重検出装置の分解斜視図、図５は本発明の荷重検出装置の動作を示す説明図である。尚、図１から図３で説明した同一部品については同一符号を付してその説明を省略する。
【００４４】
この場合、前記図１から図３で説明した第１の実施例との相違点は、前記歪み検出部材と前記係合部材及び前記荷重伝達部材の構成が一部相違している点である。
【００４５】
すなわち本実施例では、金属板からなる帯状の支持部材２１は、長手方向の中心線に沿って一端側に設けられた一対のネジ孔２１ａ、２１ｂを有している。また、長手方向の他端側には、後述する係合部材２５が固着されている。
【００４６】
歪み検出部材２２は、抵抗体などからなる歪み素子から構成されており、前記歪み検出部材２２に歪み素子を一体的に形成するか、または歪み素子自体を前記歪み検出部材２２として形成するようにしてもよい。そして、前記歪み検出部材２２は、後述する荷重伝達部材３２の一部に固着されて配設されている。
【００４７】
金属材などの強度の強い材料からなる係合部材２５は、取付部２５ａと、この取付部２５ａから垂直方向に延びる板状の腕部２５ｂと、この腕部２５ｂに設けられた四角状の孔２５ｃと、この孔２５ｃの上、下に位置する第１、第２の係合部２５ｄ、２５ｅとを有する。
【００４８】
荷重伝達部材３２は、ステンレスなどからなる板バネ３３が複数枚積層されて構成されており、この板バネ３３は、一端部３３ａが幅広で形成されると共に、この一端部３３ａから他端部３３ｂに向かうに従って漸次幅狭になるような台形状で形成されている。また、幅広の前記一端部３３ａの近傍上面には、前記歪み検出部材２２が複数個並設して固着されている。
【００４９】
そして、この荷重伝達部材３２は、幅広の一端部３３ａが前記シーソー部材９の凹部９ｃに圧入する等の方法により取り付けられると共に、荷重伝達部材３２の幅狭の他端部３３ｂは、前記係合部材２５の孔２５ｃ内の上下方向に遊びのある状態で挿通されて、荷重伝達部材３２と係合部材２５とは互いに分離された状態となっている。
【００５０】
また、係合部２５の孔２５ｃに遊びのある状態で挿通された荷重伝達部材３２は、シーソー部材９に矢印Ａ方向のの荷重がかかった時、シーソー部材９が反時計方向に回転するため、上方に位置する第１の係合部２５ｄに係合して、係合部材２５を上方へ付勢する。この結果、弾性を有する板バネ３３で構成された荷重伝達部材３２が上方へ向かって湾曲することとなり、板ばね３３の一端部３３ａの近傍上面に固着された歪み検出部材２２が撓むに従って、歪み素子も撓むようになる。
【００５１】
また、係合部２５の孔２５ｃに遊びのある状態で挿通された荷重伝達部材３２は、シーソー部材９に矢印Ｂ方向のの荷重がかかった時、シーソー部材９が時計方向に回転するため、下方に位置する第２の係合部２５ｅに係合して、係合部材２５を下方へ付勢する。この結果、弾性を有する板バネ３３で構成された荷重伝達部材３２が下方へ向かって湾曲することとなり、板ばね３３の一端部３３ａの近傍上面に固着された歪み検出部材２２が撓むに従って、歪み素子も撓むようになる。
【００５２】
次に、上記構成の荷重検出装置の動作を説明すると、先ず、シーソー部材９に設けられた荷重受け部９ｅを下方に押圧するような矢印Ａ方向の荷重がかかると、シーソー部材９は支軸１０を支点として反時計方向に回転する。すると、図５に示すように、これに伴って荷重伝達部材３２も反時計方向に回転して、荷重伝達部材３２が上方に位置する第１の係合部２５ｄに係合して、係合部材２５を上方に付勢する。
【００５３】
その結果、弾性を有する板バネ３３で構成された荷重伝達部材３２が上方へ向かって湾曲することとなり、板ばね３３の一端部３３ａの近傍上面に固着された歪み検出部材２２が撓むに従って、歪み素子も撓むようになり、そして、この歪み素子の撓みの量を電気的に検出して、荷重を測定するようになっている。
また、シーソー部材９の反時計方向の回転は、荷重受け部材９ｅ側に位置するストッパー手段１１にぶつかって、その回転がストップするようになる。
【００５４】
また、シーソー部材９に設けられた荷重受け部９ｅを上方に牽引するような矢印Ｂ方向の荷重がかかると、シーソー部材９は支軸１０を支点として時計方向に回転する。すると、これに伴って荷重伝達部材３２も時計方向に回転して、荷重伝達部材３２が下方に位置する第２の係合部２５ｅに係合して、係合部材２５を下方に付勢する。
【００５５】
その結果、弾性を有する板バネ３３で構成された荷重伝達部材３２が下方へ向かって湾曲することとなり、板ばね３３の一端部３３ａの近傍上面に固着された歪み検出部材２２が撓むに従って、歪み素子も撓むようになり、そして、この歪み素子の撓みの量を電気的に検出して、荷重を測定するようになっている。
また、シーソー部材９の時計方向の回転は、荷重伝達部材３２側に位置するストッパー手段１１にぶつかって、その回転がストップするようになる。
【００５６】
そして、このような構成の荷重検出装置を自動車の座席にする場合は、図１で示した第１の実施例と同じように、支持部材２１（１）が車体に設けられたガイド部材１４をガイドして移動可能な移動体１５に取り付けられると共に、シーソー部材９に設けられた荷重受け部９ｅには、座席１６の下部がしっかりと固定されている。
【００５７】
また、このような荷重検出装置は、座席１６の前方と後方の左右２カ所の計４個が配設され、４個の荷重検出装置のそれぞれに座席１６がしっかりと固定され、この４個の荷重検出装置によって、座席１６自体の荷重を支えたものとなっている。
そして、座席１６自体の荷重がかかった時、この重みによって、荷重伝達部材３２（１２）は、第１の係合部２５ｄ（５ｄ）に当接した状態の中立位置となり、この中立位置では、歪み検出部材２２（２）の撓みが生じない状態となっている。
【００５８】
通常、荷重検出装置への座席１６の取付位置の水平度にはバラツキがあり、このため、座席１６を荷重検出装置に固定した際、少なくとも２カ所、或いは３カ所の荷重検出装置の位置では座席１６が水平となるが、残りの位置では、座席１６の取付位置が下方、或いは上に位置した状態となり、取付位置にバラツキが生じたものとなっている。
【００５９】
そして、バラツキのある取付位置で、座席１６を荷重検出装置に固定、即ち、座席１６を荷重受け部９ｅに固定すると、水平の位置にある２カ所、或いは３カ所に配置された荷重受け部９ｅを基準にして、バラツキのある箇所では、荷重受け部９ｅが上方、或いは下方に移動したものとなるが、荷重伝達部材３２（１２）と係合部材２５（５）との間が遊びのある状態で、係合可能な状態となっているため、歪み検出部材２２（２）を撓ませることなく、それぞれの荷重伝達部材３２（１２）が第１の係合部２５ｄ（５ｄ）に係合状態、或いは係合可能な状態となる。
従って、中立位置では、全ての歪み検出部材２２（２）が撓むことなく、所定の基準値を維持した状態となる。
【００６０】
また、座席１６によって、シーソー部材９が矢印Ａ方向に押圧されたり、或いは矢印Ｂ方向に牽引したりすると、シーソー部材９がそれぞれストッパー手段１１にぶつかって、シーソー部材９の回転がストップされるため、歪み検出部材２２（２）、或いは荷重伝達部材３２（１２）に不必要な過負荷がかかることが無くなる。
【００６１】
尚、本実施例の構成においても、前記歪み検出部材２２に歪み素子を一体的に形成するか、または歪み素子自体を前記歪み検出部材２２として形成するようにすると共に、前記歪み検出部材２２を、弾性を有する板バネ３３から構成された前記荷重伝達部材３２の幅広の一端部３３ａの近傍上面に固着して配設するようにして、前記荷重伝達部材３２の幅狭の他端部３３ｂは、前記係合部材２５の孔２５ｃ内の上下方向に遊びのある状態で挿通されて、荷重伝達部材３２と係合部材２５とは互いに分離された状態になっていることから、上記した実施例と同様の効果が得られると共に、部品点数が削減できるため、安価対応が図れるものとなる。
【００６２】
【発明の効果】
本発明の荷重検出装置において、シーソー部材９に取り付けられた荷重伝達部材１２と歪み検出部材２とが分離された状態で配設されると共に、荷重伝達部材１２と歪み検出部材２との間には、荷重伝達部材１２からの荷重を歪み検出部材２に伝え、荷重伝達部材１２と係合可能な係合部材５が設けられているため、座席１６の取付位置の水平度にバラツキがあっても、歪み検出部材２を撓ませることなく、それぞれの荷重伝達部材１２が第１の係合部５ｄに係合状態、或いは係合可能な状態となって、全ての歪み検出部材２が撓むことなく、所定の基準値を維持した状態となり、精度の良い荷重測定ができる。
特に、自動車の座席に使用して好適な荷重検出装置を提供できる。
【００６３】
また、荷重伝達部材１２と係合部材５との間には、荷重伝達部材１２の移動方向に遊びを持たせたため、座席１６の取付位置の水平度に多少のバラツキがあっても、全ての歪み検出部材２が撓むことなく、所定の基準値を維持した状態となり、極めて精度の良い荷重測定ができる。
【００６４】
また、係合部材５は、上、下に位置する第１，第２の係合部５ｄ、５ｅと、この第１，第２の係合部５ｄ、５ｅとの間に設けられた孔５ｃを有し、係合部材５は、歪み検出部材２に取り付けられると共に、荷重伝達部材１２の一端部が孔５ｃに遊びのある状態で挿入されて、荷重伝達部材１２が第１、第２の係合部５ｄ、５ｅに係合可能としたため、その構成が簡単で、生産性が良く、安価なものが得られる。
【００６５】
また、シーソー部材９を支持する支軸１０を挟む位置には、高さ調整可能な一対のストッパー手段１１を設け、シーソー部材９が中立位置から時計方向、或いは反時計方向に回転した時、それぞれストッパー手段１１によってシーソー部材１１の回転をストップするようにしたため、荷重伝達部材１２と歪み検出部材２に不必要な過負荷がかかることが無く、変形、破損のないものが得られる。
また、ストッパー手段１１は高さの調整が可能であるため、精度の良いストッパーを提供できる。
【００６６】
また、シーソー部材９の下部には、シーソー部材９を取り付ける支持部材１が配置され、支持部材１には、支軸１０を挟む位置にネジ部材からなるストッパー手段１１がねじ込まれ、ネジ部材とシーソー部材９とが衝合して、シーソー部材９の回転をストップするようにしたため、その構成が簡単で、安価で、生産性の良好なものが得られる。
【００６７】
また、シーソー部材９の下部には、シーソー部材９を取り付ける支持部材１が配置され、シーソー部材９には、支軸１０を挟む位置に配置されたネジ部材からなるストッパー手段１１がねじ込まれ、ネジ部材と支持部材１とが衝合して、シーソー部材９の回転をストップするようにしたため、その構成が簡単で、安価で、生産性の良好なものが得られる。
【００６８】
また、シーソー部材９は荷重受け部９ｅを有し、支持部材１の水平線Ｓからの支軸１０の中心部Ｃ１までの距離Ｋと、支持部材１からの荷重受け部９ｅの中心部Ｃ２の距離Ｋとを等しくしたため、シーソー部材９の回転時、荷重受け部９ｅの垂直な上下方向の移動量を大きくでき、操作性の良好なものが得られる。
【００６９】
また、荷重伝達部材１２は、板バネ１３が複数枚積層されて構成されたため、大きな荷重に耐えることができると共に、荷重がかかった際、大きく湾曲して、繰り返しに耐え得る荷重伝達部材１２を提供できる。
【００７０】
また、荷重伝達部材１２を構成する板バネ１３は、シーソー部材９側の幅が広く、係合部材５側に向かうに従って漸次幅狭に形成したため、荷重がかかった際、大きく湾曲して、長期の繰り返しに耐え得る荷重伝達部材１２を提供できる。
【００７１】
また、シーソー部材９に取り付けられた荷重伝達部材３２が弾性を有する板材で形成されて、歪み検出部材２２が荷重伝達部材３２の一部に固着された状態で配設されると共に、荷重伝達部材３２と係合可能な係合部材２５が設けられ、シーソー部材９に荷重がかかった時、荷重伝達部材３２が係合部材２５と係合し湾曲することで歪み検出部材２２に荷重が伝わるようにしたため、座席１６の取付位置の水平度にバラツキがあっても、歪み検出部材２２を撓ませることなく、それぞれの荷重伝達部材３２が第１の係合部２５ｄに係合状態、或いは係合可能な状態となって、全ての歪み検出部材２２が撓むことなく、所定の基準値を維持した状態となり、精度の良い荷重測定ができる。また、部品点数が削減できるため、安価対応が図れる。
特に、自動車の座席に使用して好適な荷重検出装置を提供できる。
【００７２】
また、荷重伝達部材３２と係合部材２５との間には、荷重伝達部材３２の移動方向に遊びを持たせたため、座席１６の取付位置の水平度に多少のバラツキがあっても、全ての歪み検出部材２２が撓むことなく、所定の基準値を維持した状態となり、極めて精度の良い荷重測定ができる。
【００７３】
また、係合部材２５は、上、下に位置する第１，第２の係合部２５ｄ、２５ｅと、この第１，第２の係合部２５ｄ、２５ｅとの間に設けられた孔２５ｃを有し、荷重伝達部材３２の一端部が孔２５ｃに遊びのある状態で挿入されて、荷重伝達部材３２が第１、第２の係合部２５ｄ、２５ｅに係合可能としたため、その構成が簡単で、生産性が良く、安価なものが得られる。
【００７４】
また、シーソー部材９を支持する支軸１０を挟む位置には、高さ調整可能な一対のストッパー手段１１を設け、シーソー部材９が中立位置から時計方向、或いは反時計方向に回転した時、それぞれストッパー手段１１によってシーソー部材１１の回転をストップするようにしたため、荷重伝達部材３２と歪み検出部材２２に不必要な過負荷がかかることが無く、変形、破損のないものが得られる。
また、ストッパー手段１１は高さの調整が可能であるため、精度の良いストッパーを提供できる。
【００７５】
また、シーソー部材９の下部には、シーソー部材９を取り付ける支持部材２１が配置され、支持部材２１には、支軸１０を挟む位置にネジ部材からなるストッパー手段１１がねじ込まれ、ネジ部材とシーソー部材９とが衝合して、シーソー部材９の回転をストップするようにしたため、その構成が簡単で、安価で、生産性の良好なものが得られる。
【００７６】
また、シーソー部材９の下部には、シーソー部材９を取り付ける支持部材２１が配置され、シーソー部材９には、支軸１０を挟む位置に配置されたネジ部材からなるストッパー手段１１がねじ込まれ、ネジ部材と支持部材２１とが衝合して、シーソー部材９の回転をストップするようにしたため、その構成が簡単で、安価で、生産性の良好なものが得られる。
【図面の簡単な説明】
【図１】本発明の一実施例である荷重検出装置の要部の断面図。
【図２】本発明の一実施例である荷重検出装置の分解斜視図。
【図３】本発明の一実施例である荷重検出装置の動作を示す説明図。
【図４】本発明の他の実施例である荷重検出装置の分解斜視図。
【図５】本発明の他の実施例である荷重検出装置の動作を示す説明図。
【図６】従来の荷重検出装置の側面図。
【図７】従来の荷重検出装置の分解斜視図。
【符号の説明】
１支持部材
１ａ第１のネジ孔
１ｂ第２のネジ孔
１ｃ第３のネジ孔
１ｄ第４のネジ孔
１ｅ孔
２歪み検出部材
３基体
４歪み素子
５係合部材
５ａ取付部
５ｂ腕部
５ｃ孔
５ｄ第１の係合部
５ｅ第２の係合部
６座板部
７ネジ部材
８保持部材
８ａ底壁
８ｂ側壁
８ｃ孔
９シーソー部材
９ａ本体部
９ｂ取付部
９ｃ凹部
９ｄ孔
９ｅ荷重受け部
１０支軸
１１ストッパー手段（ネジ部材）
１２荷重伝達部材
１３板バネ
１３ａ一端部
１３ｂ他端部
２１支持部材
２１ａ，２１ｂネジ孔
２２歪み検出部材
２５係合部材
２５ａ取付部
２５ｂ腕部
２５ｃ孔
２５ｄ第１の係合部
２５ｅ第２の係合部
３２荷重伝達部材
３３板バネ
３３ａ一端部
３３ｂ他端部
Ｃ１中心部
Ｃ２中心部
Ｓ水平線
Ｋ距離[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load detection device suitable for use in an automobile seat.
[0002]
[Prior art]
The configuration of a conventional load detection device will be described with reference to FIGS. 6 and 7. A support member 51 made of a metal plate is provided with a pedestal 52.
The strain detection member 53 includes a base 54 made of a plate-like insulating substrate or a metal plate having an insulating layer provided on the surface thereof, and a plurality of strains made of a resistor provided on the center surface of the base 54. The strain detection member 53 is configured by an element 55 and is attached to the support member 51 by a screw member 56 in a state where one end of the base 54 is placed on the pedestal 52, The other end is attached in a state of floating from the support member 51.
[0003]
The load transmission member 57 made of a metal plate is provided with a pedestal portion 58 on one end side. The load transmission member 57 is placed by the screw member 59 in a state where the pedestal portion 68 is placed on the other end side of the base 54. It is attached to the other end of the base 54 and a load transmission member 57 is disposed in a state of facing the base 54.
[0004]
Next, the operation of the conventional load detecting device configured as described above will be described. First, the load transmitting member 57 is pressed downward on the other end side of the load transmitting member 57 located on one end side of the base 54. When a load in the direction of arrow A is applied, the other end of the base 54 is pressed through the pedestal 58.
Then, the base body 54 bends downward with the other pedestal portion 52 as a fulcrum, and as a result, the strain element 55 provided on the upper surface of the base body 54 extends, and the amount of extension of the strain element 55 is electrically measured. Detect and measure the load.
[0005]
Further, when a load in the direction of arrow B that pulls the load transmitting member 57 upward is applied to the other end side of the load transmitting member 57 located on one end side of the base 54, the base 54 is moved through the pedestal 58. The end is pulled.
Then, the base 54 bends upward as a fulcrum of the other pedestal 52, and as a result, the strain element 55 provided on the upper surface of the base 54 contracts, and the amount of extension of the strain element 55 is electrically reduced. Detect and measure the load.
[0006]
When the load detection device having such a configuration is used as an automobile seat, as shown in FIG. 6, the support member 51 is attached to a movable body 61 that guides a guide member 60 provided on the vehicle body and moves. In addition, the lower portion of the seat 62 is firmly fixed to the other end portion of the load transmitting member 57.
In addition, such load detection devices are arranged in a total of four positions, two on the right and left sides of the front and rear of the seat 62, and the seat 62 is firmly fixed to each of the four load detection devices. The load detection device supports the load of the seat 62 itself.
[0007]
However, there is variation in the level of the mounting position of the seat 62 to the load detection device. For this reason, when the seat 62 is fixed to the load detection device, the seat is at least at two or three load detection device positions. 62 becomes horizontal, but in the remaining positions, the mounting position of the seat 62 is positioned below or above, and the mounting position varies.
[0008]
For this reason, when the seat 62 is fixed to the load detection device at the mounting position having variations, the load transmission member 57 is fixed to and coupled to the strain detection member 53 by the screw member 59. Move to the mounting position.
In other words, the load transmitting member 57 moves upward or downward in a place where there is a variation with respect to the load detection devices arranged at two or three positions in the horizontal position, so that the load at the reference position is reached. The strain detection member 43 is bent more than the detection device, and the reference value of the load detection device at the variation position varies.
[0009]
Further, when the load transmitting member 57 is pressed in the direction of arrow A by the seat 62, the other end of the strain detecting member 53 comes into contact with the support member 51, and the movement of the strain detecting member 53 is stopped. At this time, the base 54 may be deformed or damaged by the contact, or the load transmitting member 57 may be pushed more than necessary to be deformed.
[0010]
[Problems to be solved by the invention]
In the conventional load detection device, since the load transmission member 57 is fixed and coupled to the strain detection member 53 by the screw member 59, when the load transmission member 57 is attached to the seat 62, there is a variation in the attachment position of the seat 62. At a certain location, the load transmission member 57 moves upward or downward, and the strain detection member 53 is bent more than the load detection device at the reference position, so that the reference of the load detection device at the position of variation is present. There is a problem that the value varies and the accuracy of load measurement is deteriorated.
[0011]
Further, when the load transmitting member 57 is pressed in the direction of arrow A by the seat 62, the other end of the strain detecting member 53 comes into contact with the support member 51, and the movement of the strain detecting member 53 is stopped. At this time, the base 54 may be deformed or damaged by the contact, or the load transmission member 57 may be pushed and deformed more than necessary.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to provide a load detection device in which a reference value is reliably set and measurement accuracy is good.
[0013]
[Means for Solving the Problems]
As a first solving means for solving the above-mentioned problem, a seesaw member capable of rotating around a support shaft, a plate-like strain detecting member having a strain element, and a load applied to the seesaw member are strained. A load transmission member that transmits to the detection member, the load transmission member is attached to the seesaw member, and the load transmission member and the strain detection member are disposed in a separated state, and the load transmission member An engagement member is provided between the load detecting member and the load detecting member to transmit the load from the load transmitting member to the strain detecting member, and the load is applied to the seesaw member. When the load is transmitted to the strain detecting member via the load transmitting member and the engaging member, the strain detecting member is bent. In the load detecting device, the engaging member has first and second engaging portions located above and below, and a hole provided between the first and second engaging portions. The engagement member is attached to the strain detection member, and one end of the load transmission member is inserted into the hole with play in the movement direction of the load transmission member, and the load transmission member Can be engaged with the first and second engaging portions, and a pair of height-adjustable stopper means is provided at a position sandwiching the support shaft that supports the seesaw member, and the seesaw member is in a neutral position. The rotation of the seesaw member is stopped by the stopper means when it is rotated clockwise or counterclockwise. The configuration.
[0015]
Ma No. 2 As a solving means, a support member for attaching the seesaw member is disposed at a lower portion of the seesaw member, and the stopper means including a screw member is screwed into the support member at a position sandwiching the support shaft. The member and the seesaw member collide with each other to stop the rotation of the seesaw member.
[0016]
The second 3 As a solving means, a support member for attaching the seesaw member is disposed below the seesaw member, and the stopper means including a screw member disposed at a position sandwiching the support shaft is screwed into the seesaw member. The screw member and the support member abut each other to stop the rotation of the seesaw member.
The second 4 As a solving means, the seesaw member has a load receiving portion, and the distance from the horizontal line of the support member to the center portion of the support shaft, and the distance of the center portion of the load receiving portion from the support member. The structure was made equal.
[0017]
The second 5 As a means for solving this problem, the load transmission member is formed by laminating a plurality of leaf springs.
The second 6 As a means for solving this problem, the leaf spring constituting the load transmitting member is configured such that the width on the seesaw member side is wide and gradually narrows toward the engagement member side.
[0018]
The second 7 As a solving means, a seesaw member that can be rotated with a support shaft as a fulcrum, a strain detection member having a strain element, and a load transmission member that transmits a load applied to the seesaw member to the strain detection member, The load transmitting member is formed of an elastic plate and is attached to the seesaw member. The strain detecting member is disposed in a state of being fixed to a part of the load transmitting member, and is associated with the load transmitting member. When a load is applied to the seesaw member, the load transmitting member engages with the engaging member and bends to transmit the load to the strain detecting member, thereby detecting the strain. The member was bent In the load detecting device, the engaging member has first and second engaging portions located above and below, and a hole provided between the first and second engaging portions. One end of the load transmitting member is inserted into the hole with play in the moving direction of the load transmitting member, so that the load transmitting member can be engaged with the first and second engaging portions. A pair of height-adjustable stopper means is provided at a position sandwiching the support shaft that supports the seesaw member, and when the seesaw member rotates clockwise or counterclockwise from the neutral position, the stopper The rotation of the seesaw member is stopped by means. The configuration.
[0019]
As an eleventh solution, a play is provided between the load transmission member and the engagement member in the moving direction of the load transmission member.
Further, as a twelfth means, the engaging member has a hole provided between the first and second engaging portions located above and below and the first and second engaging portions. And having one end portion of the load transmission member inserted in the hole with play so that the load transmission member can be engaged with the first and second engagement portions.
[0020]
Ma No. 8 As a solving means, a support member for attaching the seesaw member is disposed at a lower portion of the seesaw member, and the stopper means including a screw member is screwed into the support member at a position sandwiching the support shaft. The member and the seesaw member collide with each other to stop the rotation of the seesaw member.
[0021]
The second 9 As a solving means, a support member for attaching the seesaw member is disposed below the seesaw member, and the stopper means including a screw member disposed at a position sandwiching the support shaft is screwed into the seesaw member. The screw member and the support member abut each other to stop the rotation of the seesaw member.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings of the load detection device of the present invention, FIG. 1 is a cross-sectional view of the main part of the load detection device of the present invention, FIG. 2 is an exploded perspective view of the load detection device of the present invention, and FIG. It is explanatory drawing which shows operation | movement of an apparatus.
[0023]
Next, the configuration of the load detection device according to the present invention will be described with reference to FIGS. 1 to 3. The belt-shaped support member 1 made of a metal plate has a plurality of first and first elements provided along the longitudinal center line. Second, third, and fourth screw holes 1a, 1b, 1c, and 1d, and a relatively large circular hole 1e provided between the first and second screw holes 1a and 1b.
[0024]
The strain detection member 2 includes a substrate 3 made of a plate-like insulating substrate or a metal plate having an insulating layer provided on the surface thereof, and a plurality of strains made of a resistor provided on the surface of the central portion of the substrate 3. It is comprised with the element 4. FIG.
A plurality of strain elements 4 are provided at positions facing each other across the central portion in the longitudinal direction of the base 3.
[0025]
The engaging member 5 made of a strong material such as a metal material has an attachment portion 5a, a plate-like arm portion 5b extending from the attachment portion 5a in the vertical direction, and a square hole provided in the arm portion 5b. 5c and first and second engaging portions 5d and 5e positioned above and below the hole 5c.
The engaging member 5 has a mounting portion 5a fixed to the central portion in the longitudinal direction of the base 3 and is integrated with the base 3. The strain element 4 is located on both sides of the engaging member 5. It has become.
[0026]
In addition, seat plates 6 are disposed on the upper and lower surfaces of both ends of the base 3, and the seat plates 6 positioned below are support members positioned around the first and second screw holes 1, 1b. The two screw members 7 with heads are screwed into the first and second screw holes 1a and 1b in the holes (not shown) provided on the upper surface of the seat plate 6 and the base 3. Thus, both ends of the base 3 are attached to the support member 1 in a state where the central portion of the base 3 is lifted from the surface of the support member 1, thereby supporting both ends.
When the strain detection member 2 is attached to the support member 1, the lower portion of the engagement member 5 faces the hole 1e. When the engagement member 5 moves up and down, the hole 1e becomes a relief hole. This prevents the support member 1 from hitting.
[0027]
The holding member 8 made of a U-shaped metal plate or the like is provided on the pair of side walls 8b at positions facing each other, a bottom wall 8a, a pair of side walls 8b extending vertically from both ends of the bottom wall 8a. The holding member 8 has a bottom wall 8b disposed on the support member 1 at a central position between the third and fourth screw holes 1c and 1d. It is fixed to the support member 1 by spot welding or fixing means such as screw means.
[0028]
A seesaw member 9 made of a substantially rectangular parallelepiped metal material includes a rectangular parallelepiped main body 9a, a wide mounting portion 9b provided on one end side of the main body 9a, and a recess provided on the end face side of the mounting portion 9b. 9c, a circular hole 9d provided in a direction perpendicular to the longitudinal direction at the center in the longitudinal direction, and the hole 9d across the hole 9d, located on the opposite side of the mounting portion 9c, in a direction perpendicular to the longitudinal direction The load receiving portion 9e is provided so as to protrude from the side portion of the main body portion 9a, and the load receiving portion 9e is formed by press-fitting a metal rod into the main body portion 9a.
[0029]
The seesaw member 9 has the main body 9a positioned between the pair of side walls 8b of the holding member 8, and the cylindrical support shaft 10 is inserted into the hole 8c of the holding member 8 and the hole 9d of the seesaw member 9 to support the seesaw member 9. The shaft 10 is attached so as to be rotatable about the fulcrum.
When the seesaw member 9 is attached, the center portion C1 of the support shaft 10 and the center portion C2 of the load receiving portion 9e are at an equal distance K from the horizontal line S of the support member 1, and the body portion 9a In the lower part, the third and fourth screw holes 1c, 1d face each other.
[0030]
A pair of stopper means 11 made of a rod-shaped screw member is attached by screwing into the third and fourth screw holes 1c and 1d, respectively, and the height from the support member 1 is increased by screwing the stopper means 11 and screwing back. Adjustment is possible.
And this stopper means 11 is arrange | positioned so that the spindle 10 may be pinched | interposed, and when the load of the arrow A direction which presses down on the load receiving part 9e will be applied, the seesaw member 9 will rotate counterclockwise. At the same time, the rotation of the seesaw member 9 stops when it hits one of the stopper means 11.
[0031]
When a load in the direction of arrow B that pulls upward is applied to the load receiving portion 9e, the seesaw member 9 rotates in the clockwise direction and hits the other stopper means 11 to stop the rotation of the seesaw member 9. .
Although the stopper means 11 has been described as being attached to the support member 1, the stopper means 11 is screwed into a screw hole provided in the seesaw member 9 and attached, and the stopper means 11 is abutted against the support member 1. The rotation of the seesaw member 9 may be stopped.
[0032]
The load transmitting member 12 is configured by laminating a plurality of leaf springs 13 made of stainless steel or the like. The leaf spring 13 has a wide end portion 13a and the other end portion from the one end portion 13a. It is formed in a trapezoidal shape that gradually narrows toward 13b.
The load transmitting member 12 is attached by a method in which the wide one end portion 13a is press-fitted into the concave portion 9c of the seesaw member 9, and the narrow other end portion 13b of the load transmitting member 12 is connected to the engaging member 5. Thus, the load transmitting member 12 and the strain detecting member 2 are separated from each other.
[0033]
In addition, the load transmitting member 12 inserted in the hole 5c of the engaging portion 5 in a playful state rotates when the seesaw member 9 is loaded in the direction of arrow A, so that the seesaw member 9 rotates counterclockwise. The engaging member 5 is pulled upward by engaging with the first engaging portion 5d located above.
As a result, as the base 3 of the strain detection member 2 bends, the strain element 4 also bends.
[0034]
In addition, the load transmitting member 12 inserted in the hole 5c of the engaging portion 5 in a state where there is play is downward because the seesaw member 9 rotates clockwise when a load in the direction of arrow B is applied to the seesaw member 9. The engagement member 5 is pushed downward by engaging with the second engagement portion 5e located at the position.
As a result, as the base 3 of the strain detection member 2 bends, the strain element 4 also bends.
[0035]
Next, the operation of the load detection device of the present invention configured as described above will be described. First, when a load in the direction of arrow A is applied to press the load receiving portion 9e provided on the seesaw member 9 downward, The seesaw member 9 rotates counterclockwise about the support shaft 10 as a fulcrum.
Then, as shown in FIG. 3, the load transmitting member 12 rotates in the counterclockwise direction, and the load transmitting member 12 engages with the first engaging portion 5d positioned above to engage. The member 5 is pulled up.
As a result, the base 3 of the strain detecting member 2 is bent, and the strain element 4 is also bent according to the flex of the base 3, and the amount of the flexure of the strain element 4 is electrically detected to apply the load. It comes to measure.
Further, the countersaw rotation of the seesaw member 9 hits the stopper means 11 located on the load receiving member 9e side, and the rotation stops.
[0036]
In addition, when a load in the direction of arrow B is applied to pull the load receiving portion 9e provided on the seesaw member 9 upward, the seesaw member 9 rotates clockwise with the support shaft 10 as a fulcrum.
Then, along with this, the load transmission member 12 also rotates in the clockwise direction, and the load transmission member 12 engages with the second engagement portion 5e positioned below, and pushes down the engagement member 5 downward.
As a result, the base body 3 of the strain detecting member 2 is bent, and the strain element 4 is also bent according to the flexure of the base body 3. Then, the amount of the flexure of the strain element 4 is electrically detected to measure the load. It is supposed to be.
Further, the clockwise rotation of the seesaw member 9 hits the stopper means 11 located on the load transmission member 12 side, and the rotation stops.
[0037]
When the load detecting device having such a configuration is used as an automobile seat, as shown in FIG. 1, the support member 1 is attached to a movable body 15 that guides a guide member 14 provided on the vehicle body and moves. In addition, the lower portion of the seat 16 is firmly fixed to the load receiving portion 9e provided on the seesaw member 9.
[0038]
In addition, such load detection devices are arranged in a total of four positions, two on the left and right sides of the front and rear of the seat 16, and the seat 16 is firmly fixed to each of the four load detection devices. The load detection device supports the load of the seat 16 itself.
When a load is applied to the seat 16 itself, this weight causes the load transmission member 12 to be in a neutral position in contact with the first engagement portion 5d. At this neutral position, the strain detection member 2 is bent. Is in a state that does not occur.
[0039]
Usually, the level of the mounting position of the seat 16 to the load detection device varies, and therefore when the seat 16 is fixed to the load detection device, the seat is at least at two or three load detection device positions. 16 becomes horizontal, but in the remaining positions, the mounting position of the seat 16 is positioned below or above, and the mounting position varies.
[0040]
Then, when the seat 16 is fixed to the load detection device at the mounting position having variations, that is, when the seat 16 is fixed to the load receiving portion 9e, the load receiving portions 9e disposed at two or three horizontal positions. , The load receiving portion 9e is moved upward or downward, but can be engaged with play between the load transmitting member 12 and the engaging member 5. Therefore, each load transmitting member 12 is engaged with or engageable with the first engaging portion 5d without bending the strain detecting member 2.
Accordingly, at the neutral position, all the strain detection members 2 are not bent and maintain a predetermined reference value.
[0041]
Further, when the seesaw member 9 is pressed in the direction of arrow A by the seat 16 or pulled in the direction of arrow B, the seesaw member 9 hits the stopper means 11 and the rotation of the seesaw member 9 is stopped. Unnecessary overload is not applied to the strain detection member 2 or the load transmission member 12.
[0042]
In the above embodiment, the strain detection member 2 is supported at both ends and the engaging member 5 is disposed at the center of the strain detection member 2. However, the strain detection member 2 is supported at the cantilever The strain detection member 2 may be bent by disposing the engagement member 5 at a position opposite to the held side.
[0043]
4 and 5 show the structure of a load detection device according to another embodiment of the present invention. FIG. 4 is an exploded perspective view of the load detection device of the present invention, and FIG. 5 shows the operation of the load detection device of the present invention. It is explanatory drawing which shows. In addition, the same code | symbol is attached | subjected about the same component demonstrated in FIGS. 1-3, and the description is abbreviate | omitted.
[0044]
In this case, the difference from the first embodiment described with reference to FIGS. 1 to 3 is that the configurations of the strain detection member, the engagement member, and the load transmission member are partially different.
[0045]
That is, in this embodiment, the belt-like support member 21 made of a metal plate has a pair of screw holes 21a and 21b provided on one end side along the center line in the longitudinal direction. Further, an engagement member 25 described later is fixed to the other end side in the longitudinal direction.
[0046]
The strain detection member 22 is composed of a strain element made of a resistor or the like, and the strain detection element 22 is formed integrally with the strain detection member 22 or the strain element itself is formed as the strain detection member 22. May be. The strain detection member 22 is fixedly disposed on a part of a load transmission member 32 described later.
[0047]
The engaging member 25 made of a strong material such as a metal material has an attachment portion 25a, a plate-like arm portion 25b extending from the attachment portion 25a in the vertical direction, and a square hole provided in the arm portion 25b. 25c and first and second engaging portions 25d and 25e located above and below the hole 25c.
[0048]
The load transmitting member 32 is configured by laminating a plurality of leaf springs 33 made of stainless steel or the like. The leaf spring 33 has a wide end portion 33a and the one end portion 33a to the other end portion 33b. It is formed in a trapezoidal shape that becomes gradually narrower as it goes to. A plurality of strain detection members 22 are juxtaposed and fixed to the upper surface in the vicinity of the wide one end 33a.
[0049]
The load transmitting member 32 is attached by a method in which the wide one end 33a is press-fitted into the recess 9c of the seesaw member 9, and the narrow other end 33b of the load transmitting member 32 is engaged with the engagement. The load transmitting member 32 and the engaging member 25 are separated from each other by being inserted in the hole 25c of the member 25 in a vertical direction with play.
[0050]
In addition, the load transmitting member 32 inserted through the hole 25c of the engaging portion 25 in a playable state rotates the countersaw member 9 counterclockwise when a load in the direction of arrow A is applied to the seesaw member 9. The engagement member 25 is urged upward by engaging with the first engagement portion 25d located above. As a result, the load transmitting member 32 constituted by the elastic leaf spring 33 is curved upward, and as the strain detection member 22 fixed to the upper surface in the vicinity of the one end portion 33a of the leaf spring 33 is bent, The strain element also bends.
[0051]
In addition, the load transmitting member 32 inserted in the hole 25c of the engaging portion 25 in a playful state rotates clockwise when the seesaw member 9 is loaded in the arrow B direction. The engagement member 25 is urged downward by engaging with the second engagement portion 25e positioned below. As a result, the load transmitting member 32 constituted by the elastic leaf spring 33 is curved downward, and as the strain detecting member 22 fixed to the upper surface in the vicinity of the one end portion 33a of the leaf spring 33 is bent, The strain element also bends.
[0052]
Next, the operation of the load detection device having the above configuration will be described. First, when a load in the direction of arrow A is applied so as to press the load receiving portion 9e provided on the seesaw member 9 downward, the seesaw member 9 It rotates counterclockwise around 10 as a fulcrum. Then, as shown in FIG. 5, the load transmitting member 32 also rotates counterclockwise, and the load transmitting member 32 engages with the first engaging portion 25d located above, and engages. The member 25 is biased upward.
[0053]
As a result, the load transmitting member 32 constituted by the elastic leaf spring 33 is curved upward, and as the strain detection member 22 fixed to the upper surface in the vicinity of the one end portion 33a of the leaf spring 33 is bent, The strain element also bends, and the amount of deflection of the strain element is electrically detected to measure the load.
Further, the countersaw rotation of the seesaw member 9 hits the stopper means 11 located on the load receiving member 9e side, and the rotation stops.
[0054]
In addition, when a load in the direction of arrow B is applied to pull the load receiving portion 9e provided on the seesaw member 9 upward, the seesaw member 9 rotates clockwise with the support shaft 10 as a fulcrum. Then, along with this, the load transmission member 32 also rotates in the clockwise direction, and the load transmission member 32 engages with the second engagement portion 25e positioned below, and biases the engagement member 25 downward. .
[0055]
As a result, the load transmitting member 32 constituted by the elastic leaf spring 33 is curved downward, and as the strain detecting member 22 fixed to the upper surface in the vicinity of the one end portion 33a of the leaf spring 33 is bent, The strain element also bends, and the amount of deflection of the strain element is electrically detected to measure the load.
Further, the clockwise rotation of the seesaw member 9 hits the stopper means 11 located on the load transmission member 32 side, and the rotation stops.
[0056]
When the load detecting device having such a configuration is used as an automobile seat, the guide member 14 having the support member 21 (1) provided on the vehicle body is used as in the first embodiment shown in FIG. The lower part of the seat 16 is firmly fixed to the load receiving part 9e provided on the seesaw member 9 while being attached to the movable body 15 that can be guided and moved.
[0057]
In addition, such load detection devices are arranged in a total of four positions, two on the left and right sides of the front and rear of the seat 16, and the seat 16 is firmly fixed to each of the four load detection devices. The load detection device supports the load of the seat 16 itself.
When a load is applied to the seat 16 itself, this weight causes the load transmission member 32 (12) to be in a neutral position in contact with the first engaging portion 25d (5d). In this neutral position, The strain detection member 22 (2) is not bent.
[0058]
Usually, the level of the mounting position of the seat 16 to the load detection device varies, and therefore when the seat 16 is fixed to the load detection device, the seat is at least at two or three load detection device positions. 16 becomes horizontal, but in the remaining positions, the mounting position of the seat 16 is positioned below or above, and the mounting position varies.
[0059]
Then, when the seat 16 is fixed to the load detection device at the mounting position having variations, that is, when the seat 16 is fixed to the load receiving portion 9e, the load receiving portions 9e disposed at two or three horizontal positions. , The load receiving portion 9e is moved upward or downward, but there is play between the load transmitting member 32 (12) and the engaging member 25 (5). Since each of the load transmitting members 32 (12) is engaged with the first engaging portion 25d (5d) without bending the strain detecting member 22 (2). It will be in a state or an engageable state.
Accordingly, at the neutral position, all the strain detection members 22 (2) are in a state of maintaining a predetermined reference value without being bent.
[0060]
Further, when the seesaw member 9 is pressed in the direction of arrow A by the seat 16 or pulled in the direction of arrow B, the seesaw member 9 hits the stopper means 11 and the rotation of the seesaw member 9 is stopped. Unnecessary overload is not applied to the strain detection member 22 (2) or the load transmission member 32 (12).
[0061]
In the configuration of the present embodiment as well, a strain element is formed integrally with the strain detection member 22 or the strain element itself is formed as the strain detection member 22, and the strain detection member 22 is The other end portion 33b having a narrow width of the load transmitting member 32 is fixed to the upper surface in the vicinity of the wide one end portion 33a of the load transmitting member 32 constituted by the elastic leaf spring 33. Since the load transmitting member 32 and the engaging member 25 are separated from each other by being inserted in the vertical direction in the hole 25c of the engaging member 25, the load transmitting member 32 and the engaging member 25 are separated from each other. As well as the same effects as those described above, the number of parts can be reduced, so that low cost support can be achieved.
[0062]
【The invention's effect】
In the load detection device of the present invention, the load transmission member 12 attached to the seesaw member 9 and the strain detection member 2 are disposed in a separated state, and between the load transmission member 12 and the strain detection member 2. Since the engagement member 5 that transmits the load from the load transmission member 12 to the strain detection member 2 and can be engaged with the load transmission member 12 is provided, there is a variation in the horizontality of the mounting position of the seat 16. In addition, without straining the strain detection members 2, each load transmission member 12 is engaged with or engageable with the first engagement portion 5 d, and all the strain detection members 2 bend. Therefore, a predetermined reference value is maintained, and accurate load measurement can be performed.
In particular, a load detection device suitable for use in an automobile seat can be provided.
[0063]
Further, since play is provided in the moving direction of the load transmitting member 12 between the load transmitting member 12 and the engaging member 5, even if there is some variation in the level of the mounting position of the seat 16, all The strain detection member 2 is kept in a state where a predetermined reference value is maintained without being bent, and an extremely accurate load measurement can be performed.
[0064]
The engaging member 5 includes a hole 5c provided between the first and second engaging portions 5d and 5e positioned above and below and the first and second engaging portions 5d and 5e. The engagement member 5 is attached to the strain detection member 2, and one end of the load transmission member 12 is inserted in the hole 5c in a state where there is play, so that the load transmission member 12 is first and second. Since the engaging portions 5d and 5e can be engaged, the structure is simple, the productivity is good, and the inexpensive one can be obtained.
[0065]
Further, a pair of height-adjustable stopper means 11 is provided at a position sandwiching the support shaft 10 that supports the seesaw member 9, and when the seesaw member 9 is rotated clockwise or counterclockwise from the neutral position, Since the rotation of the seesaw member 11 is stopped by the stopper means 11, unnecessary overload is not applied to the load transmission member 12 and the strain detection member 2, and a member without deformation or breakage is obtained.
Moreover, since the stopper means 11 can adjust height, it can provide a highly accurate stopper.
[0066]
A support member 1 for mounting the seesaw member 9 is disposed below the seesaw member 9, and stopper means 11 made of a screw member is screwed into the support member 1 at a position sandwiching the support shaft 10, so that the screw member and the seesaw are inserted. Since the contact with the member 9 is stopped and the rotation of the seesaw member 9 is stopped, the structure is simple, inexpensive and good in productivity can be obtained.
[0067]
A support member 1 for attaching the seesaw member 9 is disposed below the seesaw member 9. The seesaw member 9 is screwed with stopper means 11 including a screw member disposed at a position sandwiching the support shaft 10. Since the member and the support member 1 collide with each other and the rotation of the seesaw member 9 is stopped, the structure is simple, inexpensive, and productive.
[0068]
Further, the seesaw member 9 has a load receiving portion 9e, and a distance K from the horizontal line S of the support member 1 to the center portion C1 of the support shaft 10 and a distance from the support member 1 to the center portion C2 of the load receiving portion 9e. Since K is made equal, when the seesaw member 9 is rotated, the amount of vertical movement of the load receiving portion 9e can be increased, and an excellent operability can be obtained.
[0069]
In addition, since the load transmission member 12 is configured by laminating a plurality of leaf springs 13, the load transmission member 12 can withstand a large load and bends greatly when a load is applied. Can be provided.
[0070]
Further, the leaf spring 13 constituting the load transmission member 12 has a wide width on the seesaw member 9 side and is gradually narrowed toward the engagement member 5 side. It is possible to provide the load transmission member 12 that can withstand the repetition of the above.
[0071]
Further, the load transmission member 32 attached to the seesaw member 9 is formed of an elastic plate material, and the strain detection member 22 is disposed in a state of being fixed to a part of the load transmission member 32, and the load transmission member. When the seesaw member 9 is loaded, when the load is applied to the seesaw member 9, the load transmission member 32 is engaged with the engagement member 25 and curved so that the load is transmitted to the strain detection member 22. Therefore, even if there is variation in the level of the mounting position of the seat 16, the respective load transmitting members 32 are engaged with or engaged with the first engaging portion 25d without bending the strain detecting member 22. It becomes a possible state, a state where a predetermined reference value is maintained without bending all the strain detection members 22, and accurate load measurement can be performed. In addition, since the number of parts can be reduced, low cost support can be achieved.
In particular, a load detection device suitable for use in an automobile seat can be provided.
[0072]
Further, since play is provided in the moving direction of the load transmitting member 32 between the load transmitting member 32 and the engaging member 25, even if there is a slight variation in the level of the mounting position of the seat 16, all The strain detection member 22 is kept in a state where a predetermined reference value is maintained without being bent, and load measurement can be performed with extremely high accuracy.
[0073]
The engaging member 25 has a hole 25c provided between the first and second engaging portions 25d and 25e positioned above and below and the first and second engaging portions 25d and 25e. And one end of the load transmission member 32 is inserted in the hole 25c with play so that the load transmission member 32 can be engaged with the first and second engagement portions 25d and 25e. Is easy, productive and inexpensive.
[0074]
Further, a pair of height-adjustable stopper means 11 is provided at a position sandwiching the support shaft 10 that supports the seesaw member 9, and when the seesaw member 9 is rotated clockwise or counterclockwise from the neutral position, Since the rotation of the seesaw member 11 is stopped by the stopper means 11, an unnecessary overload is not applied to the load transmission member 32 and the strain detection member 22, and a member without deformation or breakage is obtained.
Moreover, since the stopper means 11 can adjust height, it can provide a highly accurate stopper.
[0075]
Further, a support member 21 for attaching the seesaw member 9 is disposed below the seesaw member 9, and stopper means 11 made of a screw member is screwed into the support member 21 at a position sandwiching the support shaft 10, so that the screw member and the seesaw Since the contact with the member 9 is stopped and the rotation of the seesaw member 9 is stopped, the structure is simple, inexpensive and good in productivity can be obtained.
[0076]
A support member 21 for attaching the seesaw member 9 is disposed below the seesaw member 9, and stopper means 11 including a screw member disposed at a position sandwiching the support shaft 10 is screwed into the seesaw member 9. Since the member and the support member 21 collide with each other and the rotation of the seesaw member 9 is stopped, the structure is simple, inexpensive, and highly productive.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a load detection device according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a load detection device according to an embodiment of the present invention.
FIG. 3 is an explanatory view showing the operation of the load detection device according to the embodiment of the present invention.
FIG. 4 is an exploded perspective view of a load detection device according to another embodiment of the present invention.
FIG. 5 is an explanatory view showing the operation of a load detection device according to another embodiment of the present invention.
FIG. 6 is a side view of a conventional load detection device.
FIG. 7 is an exploded perspective view of a conventional load detection device.
[Explanation of symbols]
1 Support member
1a First screw hole
1b Second screw hole
1c Third screw hole
1d 4th screw hole
1e hole
2 Strain detection member
3 Base
4 strain elements
5 engaging members
5a Mounting part
5b Arm
5c hole
5d 1st engaging part
5e 2nd engaging part
6 Seat plate
7 Screw members
8 Holding member
8a Bottom wall
8b side wall
8c hole
9 Seesaw material
9a Body
9b Mounting part
9c recess
9d hole
9e Load receiver
10 Support shaft
11 Stopper means (screw member)
12 Load transmission member
13 Leaf spring
13a one end
13b The other end
21 Support member
21a, 21b Screw hole
22 Strain detection member
25 engaging member
25a Mounting part
25b Arm
25c hole
25d 1st engaging part
25e 2nd engaging part
32 Load transmission member
33 leaf spring
33a one end
33b The other end
C1 center
C2 center
S horizontal line
K distance

Claims

A seesaw member that can be rotated about a support shaft; a plate-like strain detection member having a strain element; and a load transmission member that transmits a load applied to the seesaw member to the strain detection member. A transmission member is attached to the seesaw member, the load transmission member and the strain detection member are disposed in a separated state, and the load transmission member is interposed between the load transmission member and the strain detection member. An engagement member is provided that transmits a load from a member to the strain detection member and can be engaged with the load transmission member. When a load is applied to the seesaw member, the load transmission member and the engagement member are interposed between the engagement member and the engagement member. A load detection device that transmits a load to the strain detection member and bends the strain detection member , wherein the engagement member includes first and second engagement portions located above and below, This first and second The engagement member is attached to the strain detection member, and one end of the load transmission member is allowed to play in the movement direction of the load transmission member in the hole. The pair of load-adjustable members that can be engaged with the first and second engaging portions and sandwiching the support shaft that supports the seesaw member are provided with a height adjustable pair. The load detecting device is characterized in that when the seesaw member is rotated clockwise or counterclockwise from a neutral position, rotation of the seesaw member is stopped by the stopper means, respectively .

A support member for attaching the seesaw member is disposed below the seesaw member, and the stopper means including a screw member is screwed into the support member so as to sandwich the support shaft, and the screw member and the seesaw member The load detection device according to claim 1 , wherein the rotation of the seesaw member is stopped by the collision .

A support member for attaching the seesaw member is disposed at a lower portion of the seesaw member, and the stopper means including a screw member disposed at a position sandwiching the support shaft is screwed into the seesaw member, and the screw member the support member and is in abutment, the seesaw member according to claim 1 Symbol placement of the load detection device is characterized in that so as to stop rotation of the.

The seesaw member has a load receiving portion, and the distance from the horizontal line of the support member to the central portion of the support shaft is equal to the distance of the central portion of the load receiving portion from the support member. The load detection device according to claim 2 or 3 .

The load transmitting member, the load detection device according to claim 1, characterized in that the leaf spring is constituted by laminating a plurality 4.

6. The load detecting device according to claim 5 , wherein the leaf spring constituting the load transmitting member is formed to have a wide width on the seesaw member side and gradually become narrower toward the engagement member side .

A seesaw member that is rotatable about a support shaft; a strain detection member having a strain element; and a load transmission member that transmits a load applied to the seesaw member to the strain detection member. Formed by an elastic plate and attached to the seesaw member, the strain detection member is disposed in a state of being fixed to a part of the load transmission member, and engageable with the load transmission member When a load is applied to the seesaw member, the load transmitting member engages with the engaging member and bends to transmit the load to the strain detecting member and bend the strain detecting member. In the load detection device, the engagement member includes a first and a second engagement portion located above and below, and a hole provided between the first and second engagement portions. One end of the load transmitting member is The support shaft supporting the seesaw member is inserted into the hole with play in the moving direction of the load transmission member so that the load transmission member can engage with the first and second engaging portions. A pair of stopper means whose height can be adjusted is provided at the sandwiching position, and when the seesaw member rotates clockwise or counterclockwise from the neutral position, the stopper means stops the rotation of the seesaw member, respectively. load weight detector you characterized in that the.

A support member for attaching the seesaw member is disposed below the seesaw member, and the stopper means including a screw member is screwed into the support member so as to sandwich the support shaft, and the screw member and the seesaw member The load detecting device according to claim 7 , wherein the rotation of the seesaw member is stopped by the collision .

A support member for attaching the seesaw member is disposed at a lower portion of the seesaw member, and the stopper means including a screw member disposed at a position sandwiching the support shaft is screwed into the seesaw member, and the screw member The load detecting device according to claim 8, wherein the support member is abutted to stop the rotation of the seesaw member .