JP3765403B2

JP3765403B2 - Electric sleeper

Info

Publication number: JP3765403B2
Application number: JP2001385863A
Authority: JP
Inventors: 規夫小野木
Original assignee: Seahonence Inc
Current assignee: Seahonence Inc
Priority date: 2001-12-19
Filing date: 2001-12-19
Publication date: 2006-04-12
Anticipated expiration: 2021-12-19
Also published as: JP2003180762A

Description

【０００１】
【発明の属する技術分野】
本発明は、支持フレームの上面側に少なくとも２つ以上の床からなる床部を備え、前記床部を構成する床のうちの前方側に位置する背部床を後方側の水平軸芯周りで起伏揺動操作することにより該背部床を起立させた起立姿勢と水平姿勢に復帰させた使用姿勢とに切り換えるための背部床用駆動機構を設けてなる電動式寝台に関する。
【０００２】
【従来の技術】
上記電動式寝台は、自力で立ち上がることができない方が、例えば食事をしたり、テレビを長時間見ることができるように床部を構成する背部床を起立姿勢にできるように構成している。
そして、前記背部床を起立姿勢にするための構成が次のようになっていた。
つまり、図１０に示すように、背部床１１に一端が固定された左右一対のブラケット６１，６１（一方のみ示している）の他端（基端）を回転自在に寝台側に支持された回転支軸６２の左右方向ほぼ中央に操作アーム６３の先端を固定し、前記操作アーム６３の他端（遊端）に伸縮式の電動モータ６４のロッド６４Ａの先端を連結して、電動モータ６４を伸縮作動させることにより、背部床１１を起立姿勢と使用姿勢とに切り換えることができるようにしていた。
【０００３】
【発明が解決しようとする課題】
上記構成によれば、寝台の下方に操作アーム６３を設置しなければならないだけでなく、伸縮により背部床を揺動操作するためには、電動モータ６４のロッド６４Ａの伸縮量を多くしなければならず、電動モータ６４自体が長手方向に長尺で大型なものになってしまうことから、背部床を含めた床部を低くすることができないだけでなく、寝台全体が大型化してしまう不都合があった。
【０００４】
本発明が前述の状況に鑑み、解決しようとするところは、小型化を図ることができる電動式寝台を提供する点にある。
【０００５】
【課題を解決するための手段】
本発明は、前述の課題解決のために、支持フレームの上面側に少なくとも２つ以上の床からなる床部を備え、前記床部を構成する床のうちの前方側に位置する背部床を後方側の水平軸芯周りで起伏揺動操作することにより該背部床を起立させた起立姿勢と水平姿勢に復帰させた使用姿勢とに切り換えるための背部床用駆動機構を設けてなる電動式寝台であって、前記背部床用駆動機構を、前記背部床を揺動操作する背部床用操作部材と、この背部床用操作部材を回転操作するために該操作部材の回転軸方向に沿って配置した減速機構を備えた背部床用電動モータとから構成し、前記背部床用電動モータのケーシングに前記背部床用操作部材の一端側を固定し、該操作部材の他端側を前記背部床に枢支連結し、前記ケーシングに前記背部床用電動モータにて揺動操作される揺動アームを貫通孔を通して突出させ、前記揺動アームが上方側へ揺動操作されることを接当阻止するためのストッパー部材を前記支持フレームに設け、前記背部床用電動モータにて前記揺動アームを上方側へ揺動操作すると、前記ストッパー部材にて該揺動アームの揺動が阻止されることによりケーシングが回転し、前記背部床用操作部材を介して前記背部床を起伏揺動操作し、前記揺動アームを前記とは反対方向に揺動すると、前記背部床の重量や該背部床に加わる人の重量により該背部床を下方側へ揺動操作し、この揺動操作しているときに該背部床と前記支持フレームとの間に手や物体を挟んでしまうと、前記揺動アームが下方へ揺動されるだけで、該背部床を下方に強制的に揺動させる力が作用しないように構成したことを特徴としている。
従って、背部床用操作部材の回転軸方向に沿って背部床用電動モータを配置することによって、背部床用操作部材に対して背部床用電動モータを上下方向においてほぼ同一レベルに配置することができる。しかも、前記背部床用電動モータは、背部床用操作部材を回転操作する構成であるから、従来のようなロッドを伸縮させる伸縮式のものに比べて小型なものにすることができる。そして、前記背部床用電動モータには減速機構を備えさせているから、背部床を揺動操作するために必要となるトルクを発生させることが可能になる。
又、上記のように背部床を下方側へ揺動操作しているときに、例えば背部床と寝台の支持フレームの間に手を挟んでしまった場合、揺動アームが下方へ揺動されるだけで、背部床を下方に強制的に揺動させる力が作用しないことになる。そして、前記挟まれた手が背部床と寝台の支持フレームの間から外れない限り、背部床がその位置を維持することになる。
【０００６】
前記床部を構成する床のうちの前後方向中央よりも少し後方側に位置する膝部床とこの膝部床の直後方に位置する脚部床を枢支連結し、前記膝部床を前方側の水平軸芯周りで起伏揺動自在に操作する膝部床用駆動機構を設け、前記膝部床用駆動機構を、前記膝部床を揺動操作する膝部床用操作部材と、この膝部床用操作部材を回転操作するために該膝部床用操作部材の回転軸方向に沿って配置した減速機構を備えた膝部床用電動モータとから構成している。
上記のように、膝部床を前方側の水平軸芯周りで揺動操作することにより膝部床と脚部床とを側面視においてほぼへの字状に姿勢変更することで、足を上方に持ち上げてリラックスできる姿勢を維持することができる。そして、膝部床用操作部材を回転操作する膝部床用電動モータを前記背部床用操作部材と同様に膝部床用操作部材に対して上下方向においてほぼ同一レベルに配置することによって、寝台が大型化することを回避することができる。又、前記膝部床用電動モータには減速機構を備えさせているから、背部床を揺動操作するために必要となるトルクを発生させることが可能になる。
【０００７】
前記膝部床用電動モータのケーシングに前記膝部床用操作部材の一端側を固定し、該操作部材の他端側を前記膝部床に枢支連結し、前記ケーシングに前記膝部床用電動モータにて揺動操作される揺動アームを貫通孔を通して突出させ、前記揺動アームが上方側へ揺動操作されることを接当阻止するためのストッパー部材を前記支持フレームに設け、前記膝部床用電動モータにて前記揺動アームを上方側へ揺動操作すると、前記ストッパー部材にて揺動アームの揺動が阻止されることによりケーシングが回転し、前記膝部床用操作部材を介して前記膝部床を起伏揺動操作し、前記揺動アームを前記とは反対方向に揺動すると、前記膝部床の重量や該膝部床に加わる人の重量により該膝部床を下方側へ揺動操作し、この揺動操作しているときに該膝部床と前記支持フレームとの間に手や物体を挟んでしまうと、前記揺動アームが下方へ揺動されるだけで、該膝部床を下方に強制的に揺動させる力が作用しないように構成したことを特徴としている。
膝部床を下方側へ揺動操作しているときに、例えば背部床と寝台の支持フレームの間に手を挟んでしまうと、揺動アームが下方へ揺動されるだけで、膝部床を下方に強制的に揺動させる力が作用しないことになる。そして、前記挟まれた手が膝部床と寝台の支持フレームの間から外れない限り、膝部床がその位置を維持することになる。
【０００９】
前記背部床用電動モータ及び前記膝部床用電動モータの減速機構のそれぞれが、電動モータ本体からの駆動軸に一体回転するように外嵌したウォームギヤからの回転力をほぼ直交する方向に変換する一対のウォームホイールとからなるウォームギヤ機構と、前記一対のウオームホイールそれぞれの支軸を互いに離間する方向に延出した延出軸部に該ウオームホイールと一体回転状態に設けられたギヤに噛み合って減速させるためのフェースギヤと、このフェースギヤと同軸芯状で一体回転する内歯ギヤに噛み合う第１ギヤを一端に備えた回転支軸の他端に備えた第２ギヤに噛み合って減速させるための遊星ギヤ機構とからなっている。
上記のようにウォームギヤ機構を用いることによって、背部床又は膝部床から受ける力によって逆回転されることがない。そして、ギアからフェースギヤへの動力伝達時に減速すると共に、第２ギヤから遊星ギヤ機構への動力伝達時に減速することができ、合計２箇所で減速することによって、大きなトルクを得ることが可能になる。
【００１０】
【発明の実施の形態】
図１及び図２に、寝台が示されており、この寝台は、前後端にそれぞれキャスター３を備えた左右一対の前後フレーム１，１とこれら前後フレームの前後２箇所の内面同士を左右方向で連結する左右フレーム２，２とからなる固定フレーム４と、この固定フレーム４に対して前後一対のリンク機構５，５及び伸縮式の電動モータ６を介して昇降自在に支持された左右一対の支持フレーム７Ａ，７Ａと、これら支持フレーム７Ａ，７Ａの前後端に溶接された前後一対の連結フレーム７Ｃ，７Ｃの左右両端に溶接された左右一対の外側フレーム７Ｂ，７Ｂと、前記外側フレーム７Ｂ，７Ｂの前端に取り付けられたヘッドボード８と、前記支持フレーム７Ａ，７Ａの上面側に支持された床部９と、この床部９の後端に取り付けられたフットボード１０とを備えている。前記外側フレーム７Ｂ，７Ｂには、図していないサイドフレームの脚部を差し込むための多数の貫通孔７Ｋを所定間隔置きに形成されている。
【００１１】
前記床部９は、前後方向前側（ヘッドボード８側）から背部床１１、座部床１２、膝部床１３、脚部床１４の順に配置されている。前記３つの背部床１１、膝部床１３、脚部床１４は、後述するように可動式に構成し、前記座部床１２のみ固定式にしているが、前記背部床１１のみ可動式に構成して実施することもできる。又、前記座部床１２を省略して実施してもよい。尚、前記座部床１２を省略する場合には、座部床１２が占める部分を埋めるために、背部床１１、膝部床１３、脚部床１４の少なくとも１つの床の前後方向の寸法を大きくして実施することになる。前記各床は、ほぼ矩形状で金属製の外枠フレームとこの外枠フレームに縦横方向に沿って設けられた多数の金属製の線材とからなっているが、他の構成であってもよい。
【００１２】
図１、図３及び図４（ａ），（ｂ）に示すように、前記背部床１１を後方側（足側）の水平軸芯Ｘ周りで起伏揺動操作することにより背部床１１を起立させた起立姿勢と水平姿勢に復帰させた使用姿勢とに切り換えるための背部床用駆動機構１５を設けている。
前記背部床用駆動機構１５は、前記背部床１１を揺動操作する左右一対の背部床用操作部材１６，１６と、これら背部床用操作部材１６，１６を回転操作するために操作部材１６，１６の回転軸方向に長手方向が平行となる状態で配置した減速機構１７を備えた背部床用電動モータ１８とから構成されている。前記背部床用操作部材１６，１６は、単一のものから構成してもよい。
【００１３】
図３及び図４（ａ），（ｂ）に示すように、前記各背部床用操作部材１６の一端（基端）を、前記背部床用電動モータ１８のケーシング１８Ａにビス止めし、前記各背部床用操作部材１６の先端に取り付けているゴムや合成樹脂等からなる回転ローラ１９を前記背部床１１の裏面（下面）に接当させた非連結状態に配置している。そして、前記背部床用電動モータ１８の出力軸にて揺動操作される揺動アーム２０を、ケーシング１８Ａの一端に形成の周方向に長い長孔１８Ｎを介してケーシング１８Ａから突出させ、その突出させた先端を前記一方の支持フレーム７Ａの内面に固定のブラケット２１にボルトにより連結固定している。従って、背部床用電動モータ１８の正転駆動により揺動操作される揺動アーム２０が固定状態にあるため、ケーシング１８Ａが回転し、背部床用操作部材１６にて背部床１１を押し上げて起立姿勢に姿勢変更することができる。これとは反対に、背部床用電動モータ１８の逆転駆動によりケーシング１８Ａが前記方向とは反対方向に回転し、背部床用操作部材１６を下方の押圧解除側へ退避させて、背部床１１に対する押圧を解除することで背部床１１を水平の使用姿勢に姿勢変更することができるようにしている。尚、図４（ａ）に示すように、前記背部床１１を水平の使用姿勢に姿勢変更しているときに、背部床１１の下面と支持フレーム７Ａの上面との間に手Ｈや他物等を挟んでしまった場合に、背部床用操作部材１６，１６は下方側へ揺動操作されるのであるが、図４（ｂ）に示すように、手Ｈや他物等が解除されるまで背部床１１はその位置を維持した状態になっている。
【００１４】
図１に示すように、前記膝部床１３とこの膝部床１３の直後方に位置する脚部床１４を枢支連結し、前記膝部床１３を前方側の水平軸芯Ｙ周りで起伏揺動自在に操作する膝部床用駆動機構２２を設けて、図１に実線で示すように膝部床１３と脚部床１４が水平に一直線状に並んだ使用姿勢と図１に２点鎖線で示すように枢支連結部２３が上方に位置して膝部床１３と脚部床１４がほぼへの字状となる姿勢に姿勢変更することができるようにしている。
前記膝部床用駆動機構２２は、前記膝部床１３を揺動操作する左右一対の膝部床用操作部材２４，２４と、これら膝部床用操作部材２４，２４を回転操作するために膝部床用操作部材２４，２４の回転軸方向に長手方向が平行となる状態で配置した減速機構２５を備えた膝部床用電動モータ２６とから構成している。前記膝部床用操作部材２４，２４は、単一のものから構成してもよい。
【００１５】
図３に示すように、前記各膝部床用操作部材２４の一端（基端）を、前記膝部床用電動モータ２６のケーシング２６Ａにビス止めし、前記各背部床用操作部材２４の先端に取り付けているゴムや合成樹脂等からなる回転ローラ２７を前記膝部床１３の裏面（下面）に接当させた非連結状態に配置している。そして、前記膝部床用電動モータ２６の出力軸にて揺動操作される揺動アーム２８を、ケーシング２６Ａの一端に形成の周方向に長い長孔（図示せず）を介してケーシング２６Ａから突出させ、その突出させた先端を前記一方の支持フレーム７Ａの内面に固定のブラケット２９にボルトにより連結固定している。従って、膝部床用電動モータ２６の正転駆動により揺動操作される揺動アーム２８が固定状態にあるため、ケーシング２６Ａが回転し、膝部床用操作部材２４にて膝部床１３を押し上げて前述のように膝部床１３と脚部床１４がほぼへの字状となる姿勢に姿勢変更することができる。これとは反対に、膝部床用電動モータ２６の逆転駆動によりケーシング２６Ａが前記方向とは反対方向に回転し、膝部床用操作部材１６を下方の押圧解除側へ退避させて、膝部床１３に対する押圧を解除することで膝部床１３と脚部床１４を水平の使用姿勢に姿勢変更することができるようにしている。尚、前記膝部床１３を水平の使用姿勢に姿勢変更しているときに、膝部床１３の下面と支持フレーム７Ａの上面との間に手や他物等を挟んでしまった場合に、膝部床用操作部材２４，２４は下方側へ揺動操作されるのであるが、手や他物等が解除されるまで膝部床１３はその位置を維持した状態になっている（前記背部床１１の場合と同様であるため、図には示していない）。
【００１６】
前記背部床用電動モータ１８及び前記膝部床用電動モータ２６は同一構成であるため、一方の背部床用電動モータ１８について説明する。
図５〜図７に示すように、背部床用電動モータ１８の減速機構１７は、電動モータ本体３０からの駆動軸３１に一体回転するように外嵌したウォームギヤ３２からの回転力をほぼ直交する方向に変換する一対のウォームホイール３３，３３とからなるウォームギヤ機構３４と、前記一対のウオームホイール３３，３３それぞれの支軸を互いに離間する方向に延出した延出軸部３５，３５にウオームホイール３３，３３と一体回転状態に設けられた動力伝達用のギヤ３６，３６に噛み合って減速させるためのフェースギヤ３７と、このフェースギヤ３７と同軸芯状で一体回転する内歯ギヤ３８に噛み合う第１ギヤ３９を一端に備えた回転支軸４０の他端に備えた第２ギヤ４１に噛み合って減速させるための遊星ギヤ機構４２とからなっている。前記遊星ギヤ機構４２は、対向位置する一対の円盤状の支持板４３，４３にそれぞれ支軸４５Ａを介して回転自在に取り付けられたギヤ４５の４個（図では３個しか見えていない）と、これらギヤ４５の回転力が伝達されて回転する可動側内歯ギヤ４６と、前記ギヤ４５の回転を許容するためにケーシング１８Ａに固定され、かつ、前記可動側内歯ギヤ４６の両側に配置された固定側内歯ギヤ４７の２個とから構成されているが、他の構成であってもよい。又、前記内歯ギア４６の歯数とギヤ４５の歯数の違いの度合いによって減速比を変更調節することができ、背部床１１の重量等に応じて減速比を自由に変更することができる。前記電動モータ１８のケーシング１８Ａは、図５に示すように３つに分割されたものからなっている。
上記のようにウォームギヤ機構３４を用いることによって、背部床１１から受ける力（背部床１１の重量や人の重量等が加わる荷重）によって逆回転されることがない。そして、ギア３６からフェースギヤ３７への動力伝達時に減速すると共に、第２ギヤ４１から遊星ギヤ機構４２への動力伝達時に減速することができ、合計２箇所で減速することによって、大きなトルクを得ることが可能になる。
【００１７】
前記背部床用電動モータ１８の電動モータ本体３０の駆動軸３１からの動力が、ウォームギヤ機構３４、ギヤ３６を介してフェースギヤ３７に伝達された後、フェースギヤ３７と一体回転する内歯ギヤ３８から第１ギヤ３９、第２ギヤ４１、遊星ギヤ機構４２を介して揺動アーム２０に伝達されて、前述のように背部床１１を起伏揺動操作することができるのである。
【００１８】
図１〜図４では、背部床用操作部材１６と背部床１１及び膝部床用操作部材２４と膝部床１３とを非連結状態に配置したが、図８に示すように、背部床用操作部材１６と背部床１１及び膝部床用操作部材２４と膝部床１３とを連結状態にして実施してもよい。尚、背部床用操作部材１６と背部床１１及び膝部床用操作部材２４と膝部床１３の連結構造が共に同一であるため、背部床用操作部材１６と背部床１１の連結構造についてのみ説明する。
図８及び図９（ａ），（ｂ）に示すように、背部床用操作部材１６の先端部を背部床１１にボルトにより固定し、前記揺動アーム２０の先端が上方側へ揺動操作されることを接当阻止するための板状のストッパー部材４８を前記一方の支持フレーム７Ａに固定している。従って、背部床用電動モータ１８にて揺動アーム２０を上方側へ揺動操作すると、前記ストッパー部材４８にて揺動アーム２０の揺動が阻止されることによりケーシング１８Ａが回転し、背部床用操作部材１６を介して背部床１１を起伏揺動操作することができる。そして、前記揺動アーム２０を前記とは反対方向に揺動すると、背部床１１の重量や背部床１１に加わる人の重量により背部床１１が下方側へ揺動操作することができる。このとき、図９（ｂ）に示すように、背部床１１（図では背部床用操作部材１６）と支持フレーム７Ａとの間に例えば手Ｈや物体等を挟んでしまうと、揺動アーム２０が下方側へ揺動されるだけで、背部床１１を下方に強制的に揺動させる力が作用しないことになる。
【００１９】
【発明の効果】
請求項１の発明によれば、背部床用操作部材の回転軸方向に沿って背部床用電動モータを配置することによって、背部床用操作部材に対して背部床用電動モータを上下方向においてほぼ同一レベルに配置することができると共に、背部床用電動モータが、背部床用操作部材を回転操作する構成であるから、従来のようなロッドを伸縮させる伸縮式のものに比べて小型なものにすることができ、寝台の小型化を図ることができる。又、前記背部床用電動モータには減速機構を備えさせているから、背部床を揺動操作するために必要となるトルクを発生させることが可能になり、従来と同様に取り扱うことができる便利な寝台にすることができる。又、背部床を下方側へ揺動操作しているときに、例えば背部床と寝台の支持フレームの間に手や他物を挟んでしまった場合でも、背部床は背部床用操作部材にて強制的に下方に揺動操作されることがなく、安全面において有利な寝台に構成することができる。
【００２０】
請求項２の発明によれば、膝部床を前方側の水平軸芯周りで揺動操作することにより膝部床と脚部床とを側面視においてほぼへの字状に姿勢変更することで、足を上方に持ち上げてリラックスできる姿勢を維持することができ、便利に使用することができる寝台に構成することができる。そして、膝部床用操作部材を回転操作する膝部床用電動モータを前記背部床用操作部材と同様に膝部床用操作部材に対して上下方向においてほぼ同一レベルに配置することによって、寝台が大型化することを回避することができるだけでなく、膝部床用電動モータには減速機構を備えさせているから、背部床を揺動操作するために必要となるトルクを発生させることが可能になり、従来と同様に取り扱うことができる便利な寝台にすることができる。
【００２１】
請求項３の発明によれば、膝部床を下方側へ揺動操作しているときに、例えば膝部床と寝台の支持フレームの間に手や他物を挟んでしまった場合でも、膝部床は膝部床用操作部材にて下方に強制的に揺動操作されることがなく、安全面において有利な寝台に構成することができる。
【００２３】
請求項４の発明によれば、ウォームギヤ機構を用いることによって、背部床又は膝部床から受ける力によって逆回転されることがなく、起伏姿勢の背部床が下方に揺動されることがなく、寝台利用者に不安感を与えることなく快適に使用することができる寝台を提供することができ。又、ギアからフェースギヤへの動力伝達時に減速すると共に、第２ギヤから遊星ギヤ機構への動力伝達時に減速することができ、合計２箇所で減速することによって、大きなトルクを得ることが可能になり、大型な寝台でも小型な電動モータにて操作することができる。
【図面の簡単な説明】
【図１】寝台の全体を示す縦断側面図である。
【図２】寝台の全体を示す一部切欠き平面図である。
【図３】背部床と膝部床の揺動構造を示す分解斜視図である。
【図４】（ａ）は背部床を下方に揺動操作している説明図、（ｂ）は背部床と支持フレームの間に手を挟んだ状態を示す説明図である。
【図５】電動モータの分解斜視図である。
【図６】電動モータの要部を示し、揺動アームと遊星ギヤ機構を示す分解斜視図である。
【図７】電動モータの要部を示し、フェースギヤの斜視図である。
【図８】背部床と膝部床の別の揺動構造を示す斜視図である。
【図９】操作部材の動作を示す説明図であり、（ａ）は操作部材を上方又は下方に揺動している状態を示し、（ｂ）は操作部材と支持フレームの間に手を挟んだ状態を示している。
【図１０】従来の寝台の要部を示す縦断側面図である。
【符号の説明】
１前後フレーム２左右フレーム
３キャスター４固定フレーム
５リンク機構６電動モータ
７Ａ支持フレーム７Ｂ外側フレーム
７Ｃ連結フレーム７Ｋ貫通孔
８ヘッドボード
９床部１０フットボード
１１背部床１２座部床
１３膝部床１４脚部床
１５背部床用駆動機構１６背部床用操作部材
１７減速機構１８背部床用電動モータ
１８Ａケーシング１８Ｎ長孔
１９回転ローラ２０揺動アーム
２１ブラケット２２膝部床用駆動機構
２３枢支連結部２４膝部床用操作部材
２５減速機構２６膝部床用電動モータ
２６Ａケーシング
２７回転ローラ２８揺動アーム
２９ブラケット３０電動モータ本体
３１駆動軸３２ウォームギヤ
３３ウォームホイール３４ウォームギヤ機構
３５延出軸部３６ギヤ
３７フェースギヤ３８内歯ギヤ
３９第１ギヤ４０回転支軸
４１第２ギヤ４２遊星ギヤ機構
４３支持板４４支軸
４５ギヤ４５Ａ支軸
４６，４７内歯ギヤ
４８ストッパー部材６１ブラケット
６２回転支軸６３操作アーム
６４電動モータ６４Ａロッド
Ｘ水平軸芯Ｙ水平軸芯[0001]
BACKGROUND OF THE INVENTION
The present invention comprises a floor portion comprising at least two floors on the upper surface side of the support frame, and the back floor located on the front side of the floors constituting the floor portion is undulated around the horizontal axis on the rear side. The present invention relates to an electric bed provided with a back floor drive mechanism for switching between a standing posture in which the back floor is raised and a use posture in which the back floor is returned to a horizontal posture by swinging operation.
[0002]
[Prior art]
The above-mentioned electric bed is configured so that a person who cannot stand up on his / her own can make the back floor constituting the floor stand upright so that, for example, he can eat and watch TV for a long time.
And the structure for making the said back floor into a standing posture was as follows.
That is, as shown in FIG. 10, the other end (base end) of a pair of left and right brackets 61 and 61 (only one is shown) whose one end is fixed to the back floor 11 is rotatably supported on the bed side. The distal end of the operation arm 63 is fixed to the center of the support shaft 62 in the left-right direction, and the distal end of the rod 64A of the telescopic electric motor 64 is connected to the other end (free end) of the operation arm 63. By extending and contracting, the back floor 11 can be switched between a standing posture and a use posture.
[0003]
[Problems to be solved by the invention]
According to the above configuration, not only the operation arm 63 has to be installed below the bed, but also in order to swing the back floor by expansion and contraction, the amount of expansion and contraction of the rod 64A of the electric motor 64 must be increased. In addition, since the electric motor 64 itself is long and large in the longitudinal direction, not only the floor including the back floor cannot be lowered, but also the inconvenience that the entire bed is enlarged. there were.
[0004]
In view of the above-described situation, the present invention is to provide an electric bed that can be reduced in size.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention includes a floor portion including at least two floors on the upper surface side of the support frame, and the back floor located on the front side of the floors constituting the floor portion is rearward. An electric bed provided with a back floor drive mechanism for switching between an upright position in which the back floor is raised and a use position in which the back position is returned to the horizontal position by operating up and down swinging around the horizontal axis of the side The back floor drive mechanism is disposed along a rotation axis direction of the operation member for rotating the back floor operation member for rotating the back floor and for rotating the operation member for the back floor. A back floor electric motor having a speed reduction mechanism, one end side of the back floor operation member is fixed to a casing of the back floor electric motor, and the other end side of the operation member is pivoted to the back floor. The back floor power is connected to the casing. A swinging arm that is swung by a motor is protruded through the through-hole, and a stopper member is provided on the support frame for preventing the swinging arm from swinging upward. When the swing arm is swung upward by the floor electric motor, the swing of the swing arm is prevented by the stopper member, so that the casing rotates and the back floor operation member is interposed. When the back floor is swung up and down and the swing arm is swung in the opposite direction, the back floor is swung downward due to the weight of the back floor and the weight of the person added to the back floor. If a hand or an object is caught between the back floor and the support frame during the swing operation, the swing arm is swung downward, and the back floor is Force to swing downward does not work It is characterized in that the sea urchin configuration.
Therefore, by arranging the back floor electric motor along the rotational axis direction of the back floor operation member, the back floor electric motor can be arranged at substantially the same level in the vertical direction with respect to the back floor operation member. it can. In addition, since the back floor electric motor is configured to rotate the back floor operation member, it can be made smaller than the conventional telescopic type that expands and contracts the rod. Since the back floor electric motor is provided with a speed reduction mechanism, it is possible to generate torque necessary for swinging the back floor.
Further, when the back floor is swung downward as described above, for example, when a hand is caught between the back floor and the support frame of the bed, the swing arm is swung downward. Only the force for forcibly swinging the back floor downward will not be applied. As long as the sandwiched hand does not come off between the back floor and the bed support frame, the back floor will maintain its position.
[0006]
Of the floors constituting the floor part, a knee floor located slightly rearward of the center in the front-rear direction and a leg floor located immediately behind the knee floor are pivotally connected, and the knee floor is forwarded A knee floor drive mechanism that is operated so as to swing up and down around a horizontal axis on the side, and the knee floor drive mechanism includes a knee floor operation member that swings the knee floor; and In order to rotate the knee-floor operation member, the knee-floor operation member includes a knee-floor electric motor provided with a speed reduction mechanism disposed along the rotation axis direction of the knee-floor operation member.
As described above, by swinging the knee floor around the front horizontal axis, the posture of the knee floor and the leg floor is changed to a substantially square shape in a side view, so that the foot is raised upward. It can be lifted to maintain a relaxed posture. Then, the knee floor electric motor for rotating the knee floor operation member is arranged at substantially the same level in the vertical direction with respect to the knee floor operation member in the same manner as the back floor operation member. Can be avoided. Further, since the knee floor electric motor is provided with a speed reduction mechanism, it is possible to generate a torque necessary for swinging the back floor.
[0007]
One end side of the knee floor operation member is fixed to the casing of the knee floor electric motor, the other end side of the operation member is pivotally connected to the knee floor, and the knee floor is connected to the casing. The support frame is provided with a stopper member for projecting a swing arm that is swing-operated by an electric motor through the through-hole and preventing the swing arm from swinging upward. When the swing arm is swung upward by the knee floor electric motor, the casing is rotated by preventing the swing arm from swinging by the stopper member, and the knee floor operation member is rotated. If the knee floor is swung up and down via the arm and the swing arm is swung in the opposite direction to the above, the knee floor depends on the weight of the knee floor and the weight of the person on the knee floor. Is swung downward, and when this rocking operation is If a hand or object is sandwiched between the floor and the support frame, the swing arm will only swing downward, and the force for forcibly swinging the knee floor will not work. It is characterized by being configured as described above.
When the knee floor is swung downward, for example, if a hand is caught between the back floor and the support frame of the bed, the swing arm is swung downward, and the knee floor The force that forcibly swings down is not applied. As long as the sandwiched hand does not come off between the knee floor and the bed support frame, the knee floor maintains its position.
[0009]
Each of the reduction mechanisms of the back floor electric motor and the knee floor electric motor converts the rotational force from the worm gear that is externally fitted so as to rotate integrally with the drive shaft from the electric motor main body in a substantially orthogonal direction. A worm gear mechanism composed of a pair of worm wheels, and an extension shaft portion extending in a direction in which the respective support shafts of the pair of worm wheels are separated from each other, meshes with a gear provided in an integrally rotating state with the worm wheel to reduce the speed. For engaging with a second gear provided at the other end of the rotary support shaft provided at one end with a first gear engaging with the face gear and an internal gear coaxially rotating integrally with the face gear. It consists of a planetary gear mechanism.
By using the worm gear mechanism as described above, it is not reversely rotated by the force received from the back floor or the knee floor. In addition, the speed can be reduced when the power is transmitted from the gear to the face gear, and the speed can be decreased when the power is transmitted from the second gear to the planetary gear mechanism, and a large torque can be obtained by reducing the speed in two places in total. Become.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a bed. This bed has a pair of left and right front and rear frames 1 and 1 each having a caster 3 at the front and rear ends, and two inner surfaces of the front and rear frames in the left and right direction. A pair of left and right supports supported by a fixed frame 4 composed of left and right frames 2 and 2 to be connected, and a pair of front and rear link mechanisms 5 and 5 and a telescopic electric motor 6 supported by the fixed frame 4 so as to be raised and lowered. Frames 7A, 7A, a pair of left and right outer frames 7B, 7B welded to the left and right ends of a pair of front and rear connection frames 7C, 7C welded to the front and rear ends of these support frames 7A, 7A, and the outer frames 7B, 7B Headboard 8 attached to the front end of the floor, floor 9 supported on the upper surface side of the support frames 7A, 7A, and footboard 1 attached to the rear end of the floor 9 It is equipped with a door. In the outer frames 7B and 7B, a plurality of through holes 7K for inserting leg portions of side frames (not shown) are formed at predetermined intervals.
[0011]
The floor portion 9 is arranged in the order from the front side in the front-rear direction (headboard 8 side) to the back floor 11, the seat floor 12, the knee floor 13, and the leg floor 14. The three back floors 11, the knee floors 13, and the leg floors 14 are configured to be movable as described later, and only the seat floor 12 is fixed, but only the back floor 11 is configured to be movable. It can also be implemented. Further, the seat floor 12 may be omitted. In the case where the seat floor 12 is omitted, the dimension in the front-rear direction of at least one of the back floor 11, the knee floor 13, and the leg floor 14 is set in order to fill the portion occupied by the seat floor 12. It will be implemented in a larger scale. Each floor is formed of a substantially rectangular metal outer frame frame and a number of metal wires provided on the outer frame frame in the vertical and horizontal directions, but may have other configurations. .
[0012]
As shown in FIGS. 1, 3, 4 (a) and 4 (b), the back floor 11 is raised by swinging and swinging the back floor 11 around the horizontal axis X on the rear side (foot side). There is provided a back floor drive mechanism 15 for switching between the standing posture and the use posture returned to the horizontal posture.
The back floor drive mechanism 15 includes a pair of left and right back floor operation members 16 and 16 for swinging the back floor 11, and an operation member 16 and 16 for rotating the back floor operation members 16 and 16. The back floor electric motor 18 is provided with a speed reduction mechanism 17 arranged in a state in which the longitudinal direction is parallel to the 16 rotation axis directions. The back floor operation members 16 and 16 may be composed of a single member.
[0013]
As shown in FIGS. 3 and 4 (a), 4 (b), one end (base end) of each back floor operating member 16 is screwed to a casing 18A of the back floor electric motor 18, A rotating roller 19 made of rubber, synthetic resin or the like attached to the tip of the back floor operation member 16 is disposed in a non-connected state in contact with the back surface (lower surface) of the back floor 11. Then, the swing arm 20 that is swing-operated by the output shaft of the electric motor 18 for the back floor is projected from the casing 18A through a long hole 18N that is long in the circumferential direction formed at one end of the casing 18A. The distal end is connected and fixed to the bracket 21 fixed to the inner surface of the one support frame 7A by bolts. Accordingly, since the swing arm 20 that is swing-operated by the forward drive of the electric motor 18 for the back floor is in a fixed state, the casing 18A rotates, and the back floor 11 is pushed up by the back floor operation member 16 to stand. The posture can be changed to the posture. On the other hand, the casing 18A rotates in the direction opposite to the above direction by the reverse drive of the electric motor 18 for the back floor, and the back floor operation member 16 is retracted to the lower pressing release side to The posture of the back floor 11 can be changed to a horizontal use posture by releasing the press. As shown in FIG. 4A, when the posture of the back floor 11 is changed to a horizontal use posture, a hand H or other object is placed between the lower surface of the back floor 11 and the upper surface of the support frame 7A. The back floor operation members 16 and 16 are swung downward when the hand is sandwiched, but the hand H and other objects are released as shown in FIG. The back floor 11 is in a state in which the position is maintained.
[0014]
As shown in FIG. 1, the knee floor 13 and a leg floor 14 located immediately behind the knee floor 13 are pivotally connected, and the knee floor 13 is undulated around a horizontal axis Y on the front side. A knee floor drive mechanism 22 that is swingably operated is provided. As shown by a solid line in FIG. 1, the knee floor 13 and the leg floor 14 are arranged in a straight line, and two points in FIG. As indicated by the chain line, the pivot connecting portion 23 is positioned upward so that the posture can be changed to a posture in which the knee floor 13 and the leg floor 14 have a substantially U shape.
The knee floor drive mechanism 22 includes a pair of left and right knee floor operation members 24 and 24 for swinging the knee floor 13 and rotating the knee floor operation members 24 and 24. The knee floor operation member 24 is composed of a knee floor electric motor 26 provided with a speed reduction mechanism 25 arranged in a state in which the longitudinal direction is parallel to the rotation axis direction of the knee floor operation members 24 and 24. The knee floor operation members 24, 24 may be composed of a single member.
[0015]
As shown in FIG. 3, one end (base end) of each knee floor operation member 24 is screwed to a casing 26 </ b> A of the knee floor electric motor 26, and the distal end of each back floor operation member 24 is fixed. A rotating roller 27 made of rubber, synthetic resin, or the like is attached in a non-connected state in contact with the back surface (lower surface) of the knee floor 13. A swing arm 28 that is swing-operated by the output shaft of the knee floor electric motor 26 is removed from the casing 26A through a long hole (not shown) that is long in the circumferential direction formed at one end of the casing 26A. The protruding tip is connected and fixed to a bracket 29 fixed to the inner surface of the one support frame 7A by a bolt. Accordingly, since the swing arm 28 that is swing-operated by the forward drive of the knee floor electric motor 26 is in a fixed state, the casing 26A rotates and the knee floor operation member 24 causes the knee floor 13 to move. As described above, the posture can be changed to a posture in which the knee floor 13 and the leg floor 14 have a substantially U-shape. On the other hand, the casing 26A rotates in the direction opposite to the aforementioned direction by the reverse drive of the knee floor electric motor 26, and the knee floor operation member 16 is retracted to the lower pressure release side, so that the knee By releasing the pressure on the floor 13, the knee floor 13 and the leg floor 14 can be changed in posture to a horizontal use posture. When the knee floor 13 is changed to a horizontal use posture, when a hand or other object is sandwiched between the lower surface of the knee floor 13 and the upper surface of the support frame 7A, The knee-floor operation members 24, 24 are swung downward, but the knee-floor 13 is maintained in its position until the hand or other object is released (the back portion). Since it is the same as the case of the floor 11, it is not shown in the figure).
[0016]
Since the back floor electric motor 18 and the knee floor electric motor 26 have the same configuration, only one back floor electric motor 18 will be described.
As shown in FIGS. 5 to 7, the speed reduction mechanism 17 of the electric motor 18 for the back floor is almost orthogonal to the rotational force from the worm gear 32 that is externally fitted to the drive shaft 31 from the electric motor body 30. A worm gear mechanism 34 composed of a pair of worm wheels 33, 33 that convert to a direction, and a worm wheel on extension shaft portions 35, 35 extending in the direction of separating the respective support shafts of the pair of worm wheels 33, 33 from each other. A face gear 37 for meshing with a power transmission gear 36, 36 provided in an integrally rotating state with 33, 33 and decelerating, and an internal gear 38 co-rotating integrally with the face gear 37 in the form of a coaxial core. It comprises a planetary gear mechanism 42 for meshing with a second gear 41 provided at the other end of the rotary shaft 40 provided with one gear 39 at one end and decelerating. The planetary gear mechanism 42 includes four gears 45 (only three are visible in the figure) that are rotatably attached to a pair of disk-shaped support plates 43, 43 that are opposed to each other via a support shaft 45A. The movable side internal gear 46 that rotates when the rotational force of the gear 45 is transmitted to the casing 18A to allow the gear 45 to rotate, and is disposed on both sides of the movable side internal gear 46. However, other configurations may be used. Further, the reduction ratio can be changed and adjusted according to the degree of difference between the number of teeth of the internal gear 46 and the number of teeth of the gear 45, and the reduction ratio can be freely changed according to the weight of the back floor 11 or the like. . The casing 18A of the electric motor 18 is divided into three as shown in FIG.
By using the worm gear mechanism 34 as described above, the reverse rotation is not caused by the force received from the back floor 11 (the load to which the weight of the back floor 11 or the weight of a person is applied). Then, the power can be reduced when the power is transmitted from the gear 36 to the face gear 37, and the power can be reduced when the power is transmitted from the second gear 41 to the planetary gear mechanism 42, and a large torque is obtained by reducing the speed in two places in total. It becomes possible.
[0017]
The power from the drive shaft 31 of the electric motor main body 30 of the back floor electric motor 18 is transmitted to the face gear 37 via the worm gear mechanism 34 and the gear 36, and then the internal gear 38 rotates integrally with the face gear 37. From the first gear 39, the second gear 41, and the planetary gear mechanism 42, the back floor 11 can be swung up and down as described above.
[0018]
In FIG. 1 to FIG. 4, the back floor operation member 16 and the back floor 11 and the knee floor operation member 24 and the knee floor 13 are arranged in a disconnected state, but as shown in FIG. The operation member 16, the back floor 11, the knee floor operation member 24, and the knee floor 13 may be connected to each other. Since the connection structure of the back floor operation member 16 and the back floor 11 and the knee floor operation member 24 and the knee floor 13 are the same, only the connection structure of the back floor operation member 16 and the back floor 11 is shown. explain.
As shown in FIGS. 8 and 9A, 9B, the tip of the back floor operating member 16 is fixed to the back floor 11 with bolts, and the tip of the swing arm 20 swings upward. A plate-like stopper member 48 for preventing contact is fixed to the one support frame 7A. Therefore, when the swing arm 20 is swung upward by the electric motor 18 for the back floor, the casing 18A is rotated by preventing the swing arm 20 from swinging by the stopper member 48, and the back floor is rotated. The back floor 11 can be swung up and down via the operation member 16. When the swing arm 20 is swung in the direction opposite to the above, the back floor 11 can be swung downward by the weight of the back floor 11 or the weight of a person applied to the back floor 11. At this time, as shown in FIG. 9B, for example, if a hand H or an object is sandwiched between the back floor 11 (the back floor operation member 16 in the figure) and the support frame 7A, the swing arm 20 Only by swinging downward, the force for forcibly swinging the back floor 11 downward does not act.
[0019]
【The invention's effect】
According to the first aspect of the present invention, by arranging the back floor electric motor along the rotational axis direction of the back floor operation member, the back floor electric motor is substantially vertically moved with respect to the back floor operation member. Since it can be arranged at the same level and the back floor electric motor is configured to rotate the back floor operation member, it is smaller than the telescopic type that expands and contracts the conventional rod. The bed can be downsized. Further, the back portion floor electric motors because they let includes a speed reduction mechanism, it is possible to generate a torque required to swing operating the back bed, it can be handled like the conventional It can be a convenient bed. When the back floor is swung downward, for example, if a hand or other object is caught between the back floor and the bed support frame, the back floor should be The bed is not forcedly swung downward, and can be configured as a bed advantageous in terms of safety.
[0020]
According to the invention of claim 2, by changing the posture of the knee floor and the leg floor in a substantially U-shape in a side view by swinging the knee floor around the horizontal axis on the front side. It can be configured as a bed that can maintain a relaxed posture by lifting the foot upward and can be used conveniently. Then, the knee floor electric motor for rotating the knee floor operation member is arranged at substantially the same level in the vertical direction with respect to the knee floor operation member in the same manner as the back floor operation member. In addition to avoiding an increase in size, the knee floor electric motor is equipped with a speed reduction mechanism, which can generate the torque required to swing the back floor. Thus, a convenient bed that can be handled in the same manner as in the past can be provided.
[0021]
According to the invention of claim 3, the knee floor when it is pivoted to the lower side, for example, between the support frame of the knee floor and the bed even when had across the hand or other object, the knee The floor is not forcedly swung downward by the knee floor operating member , and can be configured as a bed advantageous in terms of safety.
[0023]
According to the invention of claim 4 , by using the worm gear mechanism, it is not reversely rotated by the force received from the back floor or the knee floor, and the back floor in the undulating posture is not swung downward, It is possible to provide a bed that can be used comfortably without causing anxiety to the bed user. In addition, it can decelerate when the power is transmitted from the gear to the face gear, and can decelerate when the power is transmitted from the second gear to the planetary gear mechanism, and a large torque can be obtained by decelerating in two places in total. Thus, even a large bed can be operated with a small electric motor.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an entire bed.
FIG. 2 is a partially cutaway plan view showing the entire bed.
FIG. 3 is an exploded perspective view showing a rocking structure of a back floor and a knee floor.
4A is an explanatory diagram in which the back floor is swung downward, and FIG. 4B is an explanatory diagram illustrating a state in which a hand is sandwiched between the back floor and the support frame.
FIG. 5 is an exploded perspective view of the electric motor.
FIG. 6 is an exploded perspective view showing a main part of the electric motor and showing a swing arm and a planetary gear mechanism.
FIG. 7 is a perspective view of the face gear, showing the main part of the electric motor.
FIG. 8 is a perspective view showing another swing structure of the back floor and the knee floor.
FIGS. 9A and 9B are explanatory views showing the operation of the operation member, in which FIG. 9A shows a state where the operation member is swung upward or downward, and FIG. 9B shows that a hand is sandwiched between the operation member and the support frame; It shows the state.
FIG. 10 is a longitudinal side view showing a main part of a conventional bed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front and rear frame 2 Right and left frame 3 Caster 4 Fixed frame 5 Link mechanism 6 Electric motor 7A Support frame 7B Outer frame 7C Connection frame 7K Through hole 8 Headboard 9 Floor part 10 Footboard 11 Back floor 12 Seat part floor 13 Knee part floor 14 Leg floor 15 Back floor drive mechanism 16 Back floor operation member 17 Reduction mechanism 18 Back floor electric motor 18A Casing 18N Long hole 19 Rotating roller 20 Swing arm 21 Bracket 22 Knee floor drive mechanism 23 Pivot connection 24 Knee-floor operation member 25 Deceleration mechanism 26 Knee-floor electric motor 26A Casing 27 Rotating roller 28 Swing arm 29 Bracket 30 Electric motor main body 31 Drive shaft 32 Worm gear 33 Worm wheel 34 Worm gear mechanism 35 Extending shaft portion 36 Gear 37 Face gear 38 Internal gear 39 First gear 40 Rotating support shaft 41 Second gear 42 Planetary gear mechanism 43 Support plate 44 Support shaft 45 Gear 45A Support shaft 46, 47 Internal gear 48 Stopper member 61 Bracket 62 Rotating support shaft 63 Operation arm 64 Electric Motor 64A Rod X Horizontal axis Y Horizontal axis

Claims

A floor portion comprising at least two or more floors is provided on the upper surface side of the support frame, and the back floor located on the front side of the floors constituting the floor portion is operated to swing up and down around the horizontal axis on the rear side. An electric bed provided with a back floor drive mechanism for switching between a standing posture in which the back floor is raised and a use posture in which the back floor is returned to a horizontal posture, wherein the back floor drive mechanism is An operation member for the back floor that swings the back floor, and an electric motor for the back floor that includes a speed reduction mechanism arranged along the rotation axis direction of the operation member to rotate the operation member for the back floor. And one end side of the back floor operation member is fixed to the casing of the back floor electric motor, the other end side of the operation member is pivotally connected to the back floor, and the back floor electric motor is connected to the casing. Oscillating arc controlled by motor And a stopper member for preventing the swing arm from swinging upward is provided on the support frame, and the swing arm is mounted on the back floor electric motor. When the swinging operation is performed upward, the swinging of the swinging arm is prevented by the stopper member, whereby the casing rotates, and the back floor is swung up and down via the back floor operating member, When the swinging arm is swung in the opposite direction, the back floor is swung downward by the weight of the back floor or the weight of a person who is added to the back floor, and the swinging operation is performed. If a hand or an object is sandwiched between the back floor and the support frame, the swing arm forcibly swings downward, and a force for forcibly swinging the back floor acts. electric characterized by being configured so as not to Bed.

Of the floors constituting the floor part, a knee floor located slightly rearward of the center in the front-rear direction and a leg floor located immediately behind the knee floor are pivotally connected, and the knee floor is forwarded A knee floor drive mechanism that is operated so as to swing up and down around a horizontal axis on the side, and the knee floor drive mechanism includes a knee floor operation member that swings the knee floor; and 2. The knee floor electric motor comprising a speed reduction mechanism disposed along the rotational axis direction of the knee floor operation member for rotating the knee floor operation member. Electric sleeper.

One end side of the knee floor operation member is fixed to the casing of the knee floor electric motor, the other end side of the operation member is pivotally connected to the knee floor, and the knee floor is connected to the casing. The support frame is provided with a stopper member for projecting a swing arm that is swing-operated by an electric motor through the through-hole and preventing the swing arm from swinging upward. When the swing arm is swung upward by the knee floor electric motor, the casing is rotated by preventing the swing arm from swinging by the stopper member, and the knee floor operation member is rotated. If the knee floor is swung up and down via the arm and the swing arm is swung in the opposite direction to the above, the knee floor depends on the weight of the knee floor and the weight of the person on the knee floor. Is swung downward, and when this rocking operation is If a hand or object is sandwiched between the floor and the support frame, the swing arm will only swing downward, and the force for forcibly swinging the knee floor will not work. The electric bed according to claim 2 , wherein the electric bed is configured as described above.

Each of the reduction mechanisms of the back floor electric motor and the knee floor electric motor converts the rotational force from the worm gear that is externally fitted so as to rotate integrally with the drive shaft from the electric motor main body in a substantially orthogonal direction. A worm gear mechanism composed of a pair of worm wheels, and an extension shaft portion extending in a direction in which the respective support shafts of the pair of worm wheels are separated from each other, meshes with a gear provided in an integrally rotating state with the worm wheel to reduce the speed. For engaging with a second gear provided at the other end of the rotary support shaft provided at one end with a first gear engaging with the face gear and an internal gear coaxially rotating integrally with the face gear. The electric bed according to any one of claims 1 to 3 , comprising a planetary gear mechanism.