JP2004246161A

JP2004246161A - Self-standing screen with shock-absorbing mechanism

Info

Publication number: JP2004246161A
Application number: JP2003036841A
Authority: JP
Inventors: Iwao Ito; 巌伊藤
Original assignee: OS Industry Co Ltd
Current assignee: OS Industry Co Ltd
Priority date: 2003-02-14
Filing date: 2003-02-14
Publication date: 2004-09-02

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanism of effectively absorbing a shock when a self-standing screen is stored. <P>SOLUTION: In the self-standing screen, a nearly diamond-shaped pantograph is provided in which a pair of upper and lower expanding arms are connected in a stretching state and the upper and lower ends of the arms are connected to an upper connecting member and a base member, respectively, and which expands in a vertical direction through a stretch energizing means. The frame part of the screen is attached to the base member, and the upper end supporting bar is attached to the upper connecting member. Then, the screen expands and contracts in a vertical direction. An extension part is arranged on the upper arm so as to be positioned on the leading end side of the connection part with the upper connecting member. When the pantograph descends and contracts, the leading ends of the upper arm extension parts come into contact with each other before the screen storage position so as to control the contraction movement, and the pantograph can contract with the deformation of the pantograph constituting members in an elastic region from the aforesaid state to the screen storage position. The upper and lower arms connection part is provided with a means for adjusting the swing angle of the upper arm. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、映写用スクリーンの技術に係わり、更に詳しくは、スクリーン収納時にパンタグラフの伸張付勢力が低下して起こる落下現象を規制し確実且つ効果的に緩衝させる緩衝機構を備えた手動昇降形の自立式スクリーンの構造に関するものである。
【０００２】
【従来の技術】
ホームシアターなど家庭用ホームスクリーンなどの分野においては、先行技術として種々の形態が知られている。その一例として、中央部が回動可能にクロス連結された中間アームと、該中間アームの上下端にそれぞれ回動可能に連結した左右対向する各１対の上下アームと、前記下アーム基端部を回動可能に連結したベース部材と、前記上アーム先端部を回動可能に連結した上部連結部材とにより、略菱形が上下２段に連なって垂直に伸縮するパンタグラフを構成するとともに該パンタグラフにはパンタグラフを伸張付勢し且つ高さを保持する手段を備える一方、巻取収納機構を備えたスクリーンの枠体部を前記ベース部材にまたスクリーンシートの上端支持バーを前記上端連結部材にそれぞれ水平に取り付け、スクリーンシートが前記パンタグラフとともに伸縮可能に構成した自立式スクリーンが知られている（例えば、特許文献１参照）。この従来の自立式スクリーンは、パンタグラフの伸張付勢手段が対向アームに対し互いに内方に引き寄せる付勢力を付加する構成からなり、スクリーン収納位置近傍ではパンタグラフの対向アームと付勢手段とがほぼ水平姿勢になって自重を支える付勢力の有効成分がゼロに近づき急激に落下し、その衝撃でスクリーンを損傷するといった危険がある。
【０００３】
【特許文献１】
特開２０００−１３１７６６号公報（第６頁、図１参照）
【０００４】
【発明が解決しようとする課題】
前述の状況に鑑み本発明が解決しようとする課題は、自立式スクリーンにおいて、スクリーン収納時にパンタグラフ伸張付勢力の上向き有効成分がゼロに近づいた際に、スクリーンの落下を規制する緩衝機能を備えるとともに、スクリーン引き出し時にはパンタグラフ伸張付勢手段の付勢力を助勢する機能を備えた自立式スクリーンを提供することにある。また、本発明が解決しようとする他の課題は、上記の各機能を確実に作用させるための調整機構を備えた自立式スクリーンを提供することにある。
【０００５】
【課題を解決するための手段】
前述の課題を解決するため、本発明は、屈伸可能に連結した上下アームからなる１対の伸縮アームを左右に対向させてその上下端を上部連結部材と下部ベース部材とに回動可能に連結して垂直に伸縮する略菱形のパンタグラフを構成し、該パンタグラフには伸張付勢手段を設ける一方、巻取収納機構を備えたスクリーンの枠体部を前記ベース部材にまた上端支持バーを前記上部連結部材にそれぞれ水平に取り付け、スクリーンシートが前記パンタグラフとともに伸縮可能に構成した自立式スクリーンであって、このスクリーンの前記パンタグラフには、スクリーン収納位置の手前でパンタグラフの収縮を規制する機能を備え、またその機能が確実に発揮される調整手段を備える。
【０００６】
具体的には、前記パンタグラフの上アームには、前記上部連結部材との連結部から更に先端側に延出する延長部を設け、パンタグラフを下降収縮させる際にスクリーン収納位置の手前で前記延長部の先端同士が当接し、パンタグラフの収縮動作が規制され、この延長部先端同士が当接したレベルからスクリーンの収納位置に至る間は、前記パンタグラフの構成部材が弾性域内で変形する事で収縮可能に構成する。
【０００７】
この場合、パンタグラフ構成部材の左右方向への弾性変形量は、パンタグラフの上アームまたは下アームの長さの約１０００分の３程度にする。変形量をこの程度に設定すると、機構上無理な変形や塑性変形を生ずることなく適度な緩衝作用を発揮し、且つその弾性変形に伴う反発力がスクリーン引き出し時に伸張付勢手段の付勢力を助勢する手段としても利用できる。
【０００８】
また上記機能を確実に発揮させる調整手段としては、前記パンタグラフには、上下アームの屈伸連結部が上下アームを互いに上下に開閉回動可能に連結する連結具を備え、且つ、前記上下アームいずれかの端部の前記連結具取付部には、下アームに対する上アームの前後方向振れ角を調整して固定する調整手段を備えるのがよい。
【０００９】
【発明の実施の形態】
つぎに本発明の実施の形態を添付図面に基づき詳細に説明するが、本発明は添付図面に示された形態に限定されず特許請求の範囲に記載の要件を満たす実施形態のすべて含むものである。図１は、本発明に係る自立式スクリーンの実施例のスクリーンを引き出した状態を背面から見た図である。図２には、そのスクリーンの収納状態を拡大して示し、図３には、そのスクリーンを斜め上から見た斜視図を示す。また、図４は、図１のスクリーンの緩衝機構の説明図で、スクリーン収納直前の位置で上アーム上端部の先端同士が当接し下降収縮が規制された状態を示す図である。図５は、図１のスクリーンのパンタグラフ左方アームの屈伸部の拡大部分図で、（ａ）はパンタグラフ中心寄り前方から見た斜視図、（ｂ）は正面図、（ｃ）は平面をそれぞれ示している。
【００１０】
図において、自立式スクリーン１は、屈伸可能に互いの一端を連結した上下アーム２１，２２および３１，３２からなる１対の伸縮アーム２０，３０を連結部が互いに左右外方向に屈折するように対向させてその上下端を上部連結部材１６とベース部材６とにそれぞれ回動可能に連結して垂直に伸縮する略菱形のパンタグラフ１５を構成し、下アーム２１，３１とベース部材６との間にはパンタグラフ１５の伸張付勢手段４０を設ける一方、内部にスクリーンシート４の巻取収納機構を備えたスクリーン本体２を、ベース部材６の下部に接合した収納ケース３７で水平にその両端を支持し且つその上端支持バー５の中央部を上部連結部材１６に水平に取り付け、スクリーンシート４がパンタグラフ１５とともに伸縮してスクリーンシート４の展張時にはスクリーンシート４がパンタグラフ１５で垂直に支持される構成にしている。
【００１１】
そしてパンタグラフ１５の伸張付勢手段４０は、スプリング９，１２を介し一端をベース部材６に係止した左右各２本のワイヤー１０，１０，１３，１３を、ベース部材６の両端に回転可能に取り付けた各々２個ずつの滑車８，８，１１，１１にそれぞれ巻き掛けて内方に反転させ、その互いの他端を左右反対側の下アーム２１，３１の中間部前後にそれぞれ係止し、これによって左右各２本のワイヤー１０，１０，１３，１３に作用するスプリング９，１２の引っ張り付勢力でパンタグラフ１５の下アーム２１，３１を互いに内方に引き寄せ、パンタグラフ１５を伸張方向に付勢する構成としている。
【００１２】
つぎに、上記構成からなる自立式スクリーン１の各部の構造を更に詳しく説明する。まず、スクリーン本体２は、一般に公知のスプリングロール式スクリーンであり、本体枠２ａ内に回転可能に支持されたスプリングロール３と、それに巻き取ったスクリーンシート４と、スクリーンシート４の末端を支持する上端支持バー５などで構成されている。スプリングロール３は、その内部に組み込まれたスプリング（図示しない）がこのロールをスクリーンシート４の巻き込み方向に付勢し、スクリーンシート４の引き出し力を弛めると自動的に巻き取る機能を備えている。なお、本体枠２ａは、ベース部材６を保持する収納ケース３７に対しスクリーン固定部材６ａ，６ａを介し両端が保持固定され、スクリーンシート４の引き出しと巻取時には本体枠２ａは回転せず内部のスプリングロール３のみが回転する構造となっている。
【００１３】
つぎに、パンタグラフ１５は、下面が水平で且つ中央に垂直のブラケット７を有するベース部材６と、ブラケット７に基端が回動可能に連結され且つ中間に屈伸部２３ａ，３３ａを有する左右１対の伸縮アーム２０，３０と、伸縮アーム２０，３０の上端を回動可能に連結する上部連結部材１６とにより構成される。更に詳しく説明すると、伸縮アーム２０，３０は、左右１対の下アーム２１，３１のそれぞれの上端に一体的に取り付けられた連結具２１ａ，３１ａと、左右１対の上アーム２２，３２のそれぞれの下方端部２２ａ，３２ａとを連結ピン２３，３３で連結し、互いに左右外方に屈伸する姿勢で配置される。そしてこの伸縮アーム２０，３０それぞれの下アーム２１，３１の下端部２１ｂ，３１ｂはベース部材６の垂直のブラケット７に連結ピン２４，３４でそれぞれ回動可能に枢止するとともに、上アーム２２，３２の上端部２２ｂ，３２ｂは上端連結部材１６に連結ピン２５，３５でそれぞれ回動可能に連結し、垂直に伸縮する略菱形の自立式パンタグラフに構成している。
【００１４】
このパンタグラフ１５のベース部材６の左右両端は、スクリーン収納ケース３７の底面に固定されている。そして、収納ケース３７内の両端部にはスクリーン本体２の本体枠２ａ両端を固定部材６ａ，６ａで固定支持している。またパンタグラフ１５の上部連結部材１６には、スクリーンシート４の上端支持バー５の中央部を支持させる。そしてパンタグラフ伸張付勢手段４０は、引き出されたスクリーンシート４の重力とスプリングロール３の巻込み付勢力とを合わせた下方の力に伸張付勢力がほぼバランスするように設定している。なお、ベース部材６および収納ケース３７の各底面は、平坦な水平面をなしスクリーンシート４を上端まで引き出しスクリーンが起立した状態で転倒しないような十分な奥行きと安定性とを有している。
【００１５】
つぎに、パンタグラフの伸張付勢手段４０の詳細構造について説明する。パンタグラフ１５の伸張付勢手段４０は、ベース部材６両端に、下アーム２１，３１を前後に挟む形でそれぞれ２個の滑車８，１１を配置し、スプリング係止部材１４でベース部材６の中央部に係止された付勢スプリング９，１２のそれぞれの他端に一端を係止した左右各２本のワイヤー１０，１０，１３，１３の各々をそれぞれ前後２個の滑車８，８および１１，１１にそれぞれ個別に巻き掛けて内方に反転させ、各下アーム２１，３１の前後側面に沿う様に導いてその他端を左右反対側の下アーム２１，３１中間部の前後にそれぞれ係止ピン２６，３６で係止して構成する。
【００１６】
なお、自立式スクリーン１には、ベース部材６の下面左右両端に接合する底板を備えた収納ケース３７を設けている。収納ケース３７は、略直方体の箱体の上面に開閉蓋３８を有する構造からなり、折りたたまれた状態のパンタグラフ１５とスクリーン本体２との全体を収納できる大きさに形成されている。この収納ケースは、スクリーン本体２両端を固定部材６ａ，６ａを介し支持固定するとともに、パンタグラフ１５のベース部材６の固定手段（図示しない）を備えている。開閉蓋３８には中央に開口３９が貫通形成され、この開口３９はスクリーンの上端支持バー５の上部中央に取り付けられたハンドル１７の位置に一致している。
【００１７】
以上の構成により、自立式スクリーン１は、収納ケース３７の蓋３８を開き、スクリーンの上端支持バー５の上部中央のハンドル１７を手に持って上方に引き上げると、スクリーンシート４がスクリーン本体２から引き出され、パンタグラフ１５が伸張し、引き上げる動作を停止すると、引き出されたスクリーンシート４および上端支持バー５の重力およびスクリーンの巻取付勢機構（図示しない）の付勢力の合計が伸張付勢手段４０の伸張付勢力とほぼバランスしているので、その高さでスクリーンが垂直姿勢で保持される。また、収納時はハンドル３９を下方に押し下げるとパンタグラフ１５が収縮してスクリーンシート４が巻き取られる。そして、スクリーンをパンタグラフとともに収納ケース３７内に収納し、開閉蓋３８を閉じて開閉蓋３８のロック機構（図示しない）をロックし、開口３９からハンドル１７を引き出して手に下げて運搬することが可能である。
【００１８】
なお、図示の自立式スクリーン１は、スクリーンの上端支持バー５がパンタグラフ１５の上部連結部材１６の伸縮アーム２０，３０連結部の垂直壁に対し伸縮アーム２０，３０と反対側面に取り付けている。これにより上端支持バー５とパンタグラフ１５のアーム部材と干渉が回避できる。つまり、上端支持バー５を上部連結部材１６の低位置に取り付け可能となり、その作用効果としてスクリーン折りたたみ収納時の高さが低くなり、収納ケース３７が小型軽量化され運搬が容易になり且つコストも低下できる。
【００１９】
一方、上記自立式スクリーン１は、収納時にパンタグラフ１５が収納直前位置でパンタグラフの上下アームが互いに水平に近づき伸張付勢手段４０の上向き支持力がゼロに近づいた際に急激に落下する現象を規制する緩衝機構４１を備えている。この緩衝機構４１は、パンタグラフの上アーム２２，３２の上端部２２ｂ，３２ｂに、上部連結部材１６と連結する上端連結ピン２５，３５の位置から更に先端側に延出する延長部２２ｃ、３２ｃを設け、パンタグラフの下降収縮時にスクリーン収納位置の手前で延長部２２ｃ，３２ｃの先端同士が当接してパンタグラフの収縮動作が規制されるように構成する。そして、延長部２２ｃ，３２ｃの先端同士が当接して収縮動作が規制されたレベルからスクリーンの収納位置に至る間は、上端連結部材１６を強制的に下方（図４の矢印方向）に押し下げると、パンタグラフ１５がその構成部材の弾性域内で変形し、パンタグラフ１５が収縮する様にする。
【００２０】
前記における弾性域内でのパンタグラフの左右方向へのそれそれの変形量は、パンタグラフを構成する上アームまたはそれとほぼ同じ長さの下アームの長さの約１０００分の３程度になるように延長部２２ｃ，３２ｃの長さを設定する。このアーム先端同士が当接してから収納位置まで下降収縮する行程において各アームが互いに側方に押される変形量は、アーム長で異なるが具体的にはアーム長が約１ｍの場合で約３ｍｍ程度が適当量である。そしてこの変形を可能にするため、上アーム上端部２２ｂ，３２ｂの上端連結ピン２５，３５装着穴は先端方向に長く伸ばした長穴とする。この変形量に設定すると、アームが収納位置の約４°〜約５°手前で下降が規制され、パンタグラフの機構に無理な変形や塑性変形を生ずることがなく、適度な緩衝作用を発揮する。またその弾性変形に伴う反発力が、スクリーン引き出し時にパンタグラフの伸張付勢手段の付勢力を助勢する手段となる。
【００２１】
そして、上記機能を確実に発揮させる調整手段として、パンタグラフは、上下アームの屈伸部２３ａ，３３ａに上下アーム２１，２２および３１，３２を中間連結ピン２３，３３を介して互いに上下に開閉回動可能に枢止連結する連結具（図示の例では下アーム２１，３１上方の端部２１ａ，３１ａを指す）の下アーム２１，３１への取付部に、上アームの前後方向の角度を修正可能な機能を持たせる。
【００２２】
具体的には、左右の各下アーム２１，３１それぞれの部材先端に取り付ける連結具２１ａ，３１ａは、それぞれ同じ対称形状であり、その一方２１ａを図５に示す。連結具２１ａは、下アーム２１の部材先端の外側面と接する外側板と、下アーム２１の部材先端の前後側面と僅かな隙間を隔てて対峙する前後側板とを有する溝形部材からなる。そして、連結具２１ａの前後側板の先端側端部には上アーム２２を連結する中間連結ピン２３装着用の貫通孔が形成され、連結具２１ａの外側板中央にはその溝内にて下アーム２１の部材先端に首振り可能に連結する支点ピン２７用の装着穴が貫通形成され、且つ支点ピン２７用の装着穴近傍の外側板と前後側板とには下アーム２１の部材先端を側方と外方から保持固定するための調整ネジ用２８のねじ孔がそれぞれ複数貫通形成されている。
【００２３】
下アーム２１と上アーム２２とを連結する場合、まず、ベース部材６に下アーム２１の下端部２１ｂを下端連結ピン２４で連結枢止しておく。つぎに上記連結具２１ａを上アーム端部２２ａに中間連結ピン２３で回動可能に連結枢止する。そして下アーム２１の部材先端を連結具２１ａの溝部に挿入しその外端を連結具２１ａの溝底に当接させ、外側板外面から下アーム部材端に支点ピン２７を挿入し、この支点ピン２７を支点として連結具２１ａを取り付けた上アーム２２が下アーム２１に対し前後方向に首振り可能に連結する。つぎに、連結具２１ａの支点ピン２７近傍の外側板と前後側板とに形成された前記各ねじ孔に調整ネジ２８を螺合し、上下アーム２２，２１が互いに正しく重ね合わさる状態に保って全ての調整ネジ２８を均等に締め付け、その状態で下アーム２１を連結具２１ａに保持固定して一体化する。以上により伸縮アーム２０は下アーム２１と上アーム２２とが互いにベース部材６の左右方向に沿う同一垂直平面に沿って正しく屈伸するように組み立てられる。つぎに、伸縮アーム２０に対向する他方の伸縮アーム３０も上記と同様の手順で組み立てる。
【００２４】
最後に伸縮アーム２０，３０の先端に上部連結部材１６を連結してパンタグラフ１５を構成すると、左右の伸縮アーム２０，３０は、互いに共通の垂直平面に沿って屈伸可能となる。これにより、パンタグラフ１５が下降収縮して収納位置の手前に達した時に、上アーム２２，３２上端の延長部２２ｃ，３２ｃの先端が互いに正しく向き合って当接し、パンタグラフ１５の下降収縮が規制され、緩衝機構４１を正確に機能させることが可能となる。そして、使用中にパンタグラフ１５の上下アームの連結に狂いが生じ、緩衝機構４１の機能が低下した際には、上記と同様にして連結具２２ａ，３２ａの調整ネジ２８を調整する。この調整により、緩衝機構４１が常に正常に機能するように矯正できる。
【００２５】
上記説明では、パンタグラフ１５の伸縮アーム２０，３０の屈伸部２３ａ，３３ａに設ける連結具２１ａ，３１ａは、下アーム２１，３１の部材先端に取り付ける場合を実施例として説明したが、これとは反対に、連結具２１ａ，３１ａを上アーム２２，３２のアーム部材下方端に上記と同様の形態で取り付け可能に形成し、その連結具２１ａ，３１ａ端部の中間連結ピン装着穴と下アーム２１，３１のアーム部材先端に形成した中間連結ピン装着穴とを合わせて中間連結ピン２３，３３を装着して両者を連結し、上記と同様な手順で下アーム２１，３１に対する上アーム２２，３２の前後の振れ角を調整して固定する方式としてもよい。
【００２６】
そして、上記いずれの方法を採る場合も、製作誤差などの関係で左右の下アーム２１，３１が互いにほぼ一直線方向に沿わず、修正困難な狂いが残るような場合には、パンタグラフ１５が下降収縮して収納位置の手前で上アーム延長部２２ｃ，３２ｃ先端同士が当接する状態で上アーム２２，３２が互いにほぼ一直線方向に沿う向きになるよう、連結具２１ａ，３１ａのアーム部材先端部への取付調整を行えば、前述の場合と同様に緩衝機能を発揮させる事が可能となる。。
【００２７】
【発明の効果】
請求項１の発明に係る自立式スクリーンは、スクリーンを支持し垂直に伸縮する略菱形のパンタグラフの上アームには、該上アームを回動可能に連結する上部連結部材の連結部から更に先端側に延出する延長部を設け、パンタグラフを下降収縮させる際に、スクリーン収納位置の手前で前記延長部の先端同士が当接してパンタグラフの収縮動作が規制され、この延長部の先端同士が当接したレベルからスクリーンの収納位置に至る間は上端連結部材を強制的に押し下げ、パンタグラフがその構成部材の弾性域内で変形することで収縮する構成としたので、スクリーン収納時にパンタグラフ伸張付勢力の上向き成分がゼロに近づいてもスクリーンの落下を規制する。このパンタグラフ構成部材の弾性変形作用は、スクリーン収納時の緩衝作用として機能するほか、スクリーン引き出し時には弾性変形に伴う反発力がパンタグラフ伸張付勢手段の伸張を助勢する作用効果が得られる。
【００２８】
ところで、スクリーンの落下を規制する緩衝機能とスクリーン引き出し時のパンタグラフ伸張付勢の助勢機能とは、パンタグラフの上下アームの互いの前後方向の角度が僅かに狂うと確実に作用しなくなるので、組み立てには高い精度を必要とする。そこで、請求項２の発明に係る自立式スクリーンは、スクリーンを支持し垂直に伸縮する略菱形のパンタグラフは、上下アームの屈伸連結部に上下アームを互いに上下に開閉回動可能に連結する連結具を介在させ、且つ、該連結具には、下アームに対し上アームを前後に偏向可能に支持する支点ピンと、上アームの前後偏向を拘束して固定する可調整の固定手段とを備えた。これにより、パンタグラフの上アーム先端同士が正しく向き合って当接し且つ上下アームが互いに正しく重なって折りたたまれるように、組み立て時や必要な時には随時、誤差修正と矯正の作業が容易に行える。つまりこの調整機構は、スクリーン収納時の緩衝機能とスクリーン引き出し時の助勢機能とを確実に発揮させるうえで重要な役割を担う手段であるといえる。
【図面の簡単な説明】
【図１】本発明に係る自立式スクリーンの実施例を示し、スクリーンを引き出した状態を背面から見た図である。
【図２】図１のスクリーンを収納した状態を拡大して示す図である。
【図３】図１のスクリーンを斜め上から見た斜視図である。
【図４】図１のスクリーンの緩衝機構の説明図で、スクリーン収納直前の位置で上アーム上端部の先端同士が当接し下降収縮が規制された状態を示す図である。
【図５】図１のスクリーンのパンタグラフ左方アームの屈伸部の拡大部分図で、（ａ）はパンタグラフ中心寄り前方から見た斜視図、（ｂ）は正面図、（ｃ）は平面をそれぞれ示している。
【符号の説明】
１自立式スクリーン
２スクリーン本体
２ａ本体枠
３スプリングロール
４スクリーンシート
５上端支持バー
６ベース部材
６ａスクリーン固定部材
７ブラケット
８，１１滑車
８ａ，１１ａ支軸
９，１２スプリング
１０，１３ワイヤー
１４スプリング係止部材
１５パンタグラフ
１６上端連結部材
１７ハンドル
２０，３０伸縮アーム
２１，３１下アーム
２１ａ，３１ａ連結具（端部）
２１ｂ，３１ｂ下端部
２２，３２上アーム
２２ａ，３２ａ端部
２２ｂ，３２ｂ上端部
２２ｃ，３２ｃ延長部
２３，３３中間連結ピン
２３ａ，３３ａ屈伸部
２４，３４下端連結ピン
２５，３５上端連結ピン
２６，３６ワイヤー係止ピン
２７支点ピン
２８調整ネジ
３７収納ケース
３８開閉蓋
３９開口
４０伸張付勢手段
４１緩衝機構[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to the technology of a projection screen, and more particularly, to a manual lifting / lowering type equipped with a buffer mechanism for reliably and effectively buffering a drop phenomenon that occurs due to a decrease in the extension biasing force of a pantograph when the screen is stored. It relates to the structure of a free-standing screen.
[0002]
[Prior art]
In the field of home screens such as home theaters and the like, various forms are known as prior art. As an example, an intermediate arm having a central portion rotatably cross-connected, a pair of upper and lower arms opposing left and right rotatably connected to upper and lower ends of the intermediate arm, and a base end of the lower arm By a base member rotatably connected to the upper arm and an upper connecting member rotatably connected to the tip of the upper arm, a substantially rhombus is formed in a two-tiered vertically extending and contracting pantograph. Is provided with means for extending and urging the pantograph and maintaining the height, while the frame portion of the screen provided with the take-up and storage mechanism is horizontally mounted on the base member, and the upper support bar of the screen sheet is horizontally mounted on the upper connection member. And a self-standing screen in which a screen sheet is configured to be able to expand and contract together with the pantograph is known (for example, see Patent Document 1). This conventional self-standing screen has a configuration in which the extension biasing means of the pantograph applies a biasing force to draw inwardly to the opposing arm, and the opposing arm of the pantograph and the biasing means are substantially horizontal near the screen storage position. There is a danger that the effective component of the biasing force supporting the own weight in the posture becomes close to zero and drops sharply, and the impact damages the screen.
[0003]
[Patent Document 1]
JP-A-2000-131766 (see page 6, FIG. 1)
[0004]
[Problems to be solved by the invention]
In view of the above situation, the problem to be solved by the present invention is to provide a self-supporting screen with a buffer function for restricting the screen from falling when the upward effective component of the pantograph stretching biasing force approaches zero when the screen is stored. Another object of the present invention is to provide a self-supporting screen having a function of assisting the urging force of the pantograph expansion urging means when the screen is pulled out. Another object of the present invention is to provide a self-supporting screen provided with an adjustment mechanism for reliably operating each of the above functions.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a pair of telescopic arms, which are composed of upper and lower arms that are flexibly connected to each other, and are rotatably connected to upper and lower ends of an upper connecting member and a lower base member. To form a substantially rhombus-shaped pantograph that expands and contracts vertically, and the pantograph is provided with an extension biasing means, while a frame portion of a screen having a winding storage mechanism is provided on the base member, and an upper end support bar is provided on the upper portion. Each is horizontally attached to the connecting member, a self-supporting screen in which the screen sheet is configured to be able to expand and contract together with the pantograph, wherein the pantograph of the screen has a function of restricting shrinkage of the pantograph in front of the screen storage position, In addition, an adjusting means is provided for reliably performing the function.
[0006]
Specifically, the upper arm of the pantograph is provided with an extension extending further forward from the connection portion with the upper connection member, and when the pantograph is lowered and contracted, the extension is provided just before the screen storage position. The ends of the pantographs are in contact with each other, and the contraction operation of the pantograph is regulated. During the period from the level where the ends of the extension parts contact each other to the storage position of the screen, the components of the pantograph can be contracted by being deformed in the elastic range. To be configured.
[0007]
In this case, the amount of elastic deformation of the pantograph components in the left-right direction is set to about three thousandths of the length of the upper or lower arm of the pantograph. When the amount of deformation is set to this level, a moderate buffering action is exhibited without mechanically unreasonable deformation or plastic deformation, and the repulsive force accompanying the elastic deformation assists the urging force of the extension urging means when pulling out the screen. It can also be used as a means of doing.
[0008]
Further, as an adjusting means for reliably exerting the above function, the pantograph has a connecting tool for connecting the upper and lower arms so that the upper and lower arms can be vertically opened and closed and rotatably connected to each other. It is preferable that the connecting part mounting portion at the end of the first arm is provided with an adjusting means for adjusting and fixing the swing angle of the upper arm in the front-rear direction with respect to the lower arm.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, but includes all embodiments satisfying the requirements described in the claims. FIG. 1 is a rear view of a free-standing screen according to an embodiment of the present invention, in which a screen is pulled out. FIG. 2 is an enlarged view showing the stored state of the screen, and FIG. 3 is a perspective view of the screen as viewed obliquely from above. FIG. 4 is an explanatory view of the buffer mechanism of the screen of FIG. 1 and shows a state in which the tips of the upper arm upper ends abut against each other at a position immediately before the screen is stored, and the downward contraction is restricted. 5 is an enlarged partial view of a bending portion of the left arm of the pantograph of the screen of FIG. 1, (a) is a perspective view from the front near the center of the pantograph, (b) is a front view, and (c) is a plan view. Is shown.
[0010]
In the figure, a self-supporting screen 1 has a pair of telescopic arms 20, 30 composed of upper and lower arms 21, 22, and 31, 32, which are connected to each other so as to be able to bend and extend, so that the connecting portions bend right and left outwardly. The upper and lower ends thereof are rotatably connected to the upper connecting member 16 and the base member 6 so as to be opposed to each other to constitute a substantially rhombic pantograph 15 which expands and contracts vertically, and is formed between the lower arms 21 and 31 and the base member 6. Is provided with an extension urging means 40 for the pantograph 15, while the screen main body 2 having a take-up and storage mechanism for the screen sheet 4 therein is horizontally supported by a storage case 37 joined to a lower portion of the base member 6. Then, the central portion of the upper end support bar 5 is horizontally attached to the upper connecting member 16, and the screen sheet 4 expands and contracts together with the pantograph 15 to form the screen sheet 4. And a configuration in which the screen sheet 4 is supported vertically pantograph 15 when Zhang.
[0011]
The extension urging means 40 of the pantograph 15 can rotate the two right and left wires 10, 10, 13, 13, each having one end locked to the base member 6 via the springs 9, 12, at both ends of the base member 6. Each of the two attached pulleys 8, 8, 11, 11 is wound around and turned inward, and the other ends of the pulleys are respectively engaged with the front and rear intermediate portions of the lower arms 21, 31 on the right and left opposite sides. Thereby, the lower arms 21 and 31 of the pantograph 15 are pulled inward each other by the pulling urging force of the springs 9 and 12 acting on the two wires 10, 10, 13 and 13 on the left and right sides, and the pantograph 15 is attached in the extension direction. It has a configuration that vigorously.
[0012]
Next, the structure of each part of the self-supporting screen 1 having the above configuration will be described in more detail. First, the screen main body 2 is a generally known spring roll type screen, and supports a spring roll 3 rotatably supported in a main body frame 2 a, a screen sheet 4 wound around the spring roll 3, and an end of the screen sheet 4. It is composed of an upper end support bar 5 and the like. The spring roll 3 has a function of automatically rewinding when a spring (not shown) incorporated therein urges the roll in the winding direction of the screen sheet 4 and loosens the drawing force of the screen sheet 4. . In addition, both ends of the main body frame 2a are held and fixed to the storage case 37 holding the base member 6 via the screen fixing members 6a, 6a, and the main body frame 2a does not rotate when the screen sheet 4 is pulled out and wound up. The structure is such that only the spring roll 3 rotates.
[0013]
Next, the pantograph 15 has a base member 6 having a bracket 7 whose lower surface is horizontal and vertical at the center, and a pair of right and left having a base end rotatably connected to the bracket 7 and bending portions 23a and 33a in the middle. Of the telescopic arms 20, 30 and an upper connecting member 16 for rotatably connecting the upper ends of the telescopic arms 20, 30. More specifically, the telescopic arms 20 and 30 include connecting tools 21a and 31a integrally attached to upper ends of a pair of left and right lower arms 21 and 31, and a pair of upper arms 22 and 32 respectively. Are connected to the lower ends 22a, 32a by connecting pins 23, 33, and are arranged so as to bend left and right outward. The lower ends 21b and 31b of the lower arms 21 and 31 of the telescopic arms 20 and 30 are rotatably pivoted to the vertical bracket 7 of the base member 6 by connecting pins 24 and 34, respectively. The upper end portions 22b and 32b of the 32 are rotatably connected to the upper end connecting member 16 by connecting pins 25 and 35, respectively, to form a substantially rhombic free-standing pantograph that expands and contracts vertically.
[0014]
The left and right ends of the base member 6 of the pantograph 15 are fixed to the bottom surface of the screen storage case 37. At both ends in the storage case 37, both ends of the main body frame 2a of the screen main body 2 are fixed and supported by fixing members 6a, 6a. The upper connecting member 16 of the pantograph 15 supports the center of the upper end support bar 5 of the screen sheet 4. The pantograph extension urging means 40 is set such that the extension urging force is substantially balanced with the downward force obtained by adding the gravity of the drawn-out screen sheet 4 and the winding urging force of the spring roll 3. The bottom surfaces of the base member 6 and the storage case 37 have a sufficient depth and stability so that the screen sheet 4 is pulled out to the upper end and the screen does not fall when the screen stands upright.
[0015]
Next, the detailed structure of the pantograph extension and urging means 40 will be described. The extension biasing means 40 of the pantograph 15 has two pulleys 8 and 11 arranged at both ends of the base member 6 so as to sandwich the lower arms 21 and 31 back and forth, respectively. The two right and left wires 10, 10, 13, 13 each having one end locked to the other end of each of the biasing springs 9, 12 locked to the portion, are respectively connected to two front and rear pulleys 8, 8, and 11 respectively. , 11 are individually wound around and turned inward, and guided along the front and rear side surfaces of each of the lower arms 21, 31, and the other ends are respectively locked to the front and rear of the lower arm 21, 31 intermediate portion on the opposite side. It is constituted by locking with pins 26 and 36.
[0016]
The self-standing screen 1 is provided with a storage case 37 having a bottom plate joined to both left and right ends of the lower surface of the base member 6. The storage case 37 has a structure having an opening / closing lid 38 on the upper surface of a substantially rectangular parallelepiped box, and is formed in a size that can store the entire pantograph 15 and the screen main body 2 in a folded state. This storage case supports and fixes both ends of the screen main body 2 via fixing members 6a, 6a, and includes fixing means (not shown) for the base member 6 of the pantograph 15. An opening 39 is formed through the opening / closing lid 38 at the center, and the opening 39 corresponds to the position of the handle 17 attached to the upper center of the upper end support bar 5 of the screen.
[0017]
With the above configuration, the self-standing screen 1 opens the cover 38 of the storage case 37 and holds the handle 17 at the upper center of the upper end support bar 5 of the screen and pulls it upward. When the pantograph 15 is extended and the pantograph 15 is extended, and the lifting operation is stopped, the gravity of the extracted screen sheet 4 and the upper end support bar 5 and the total urging force of the screen winding attachment urging mechanism (not shown) become the extension urging means 40. And the screen is held in a vertical position at that height. When the handle 39 is pushed downward during storage, the pantograph 15 contracts and the screen sheet 4 is wound up. Then, the screen is stored in the storage case 37 together with the pantograph, the opening / closing lid 38 is closed, the lock mechanism (not shown) of the opening / closing lid 38 is locked, the handle 17 is pulled out from the opening 39, and the screen is lowered to the hand for transportation. It is possible.
[0018]
In the illustrated free-standing screen 1, the upper end support bar 5 of the screen is attached to the side opposite to the telescopic arms 20 and 30 with respect to the vertical wall of the telescopic arm 20 and 30 connecting part of the upper connecting member 16 of the pantograph 15. Thereby, interference between the upper end support bar 5 and the arm member of the pantograph 15 can be avoided. In other words, the upper end support bar 5 can be attached to the lower position of the upper connecting member 16, and as a function effect, the height when the screen is folded and stored is reduced, the storage case 37 is reduced in size and weight, and the transportation is facilitated and the cost is reduced. Can be lowered.
[0019]
On the other hand, the self-supporting screen 1 regulates the phenomenon that the pantograph 15 is suddenly dropped when the upper and lower arms of the pantograph approach each other horizontally and the upward supporting force of the extension biasing means 40 approaches zero at the position immediately before the storage. A buffer mechanism 41 is provided. The cushioning mechanism 41 includes extension portions 22c and 32c that extend further forward from the positions of the upper end connection pins 25 and 35 that are connected to the upper connection member 16 to the upper end portions 22b and 32b of the upper arms 22 and 32 of the pantograph. When the pantograph is lowered and contracted, the distal ends of the extended portions 22c and 32c abut each other just before the screen storage position, so that the pantograph contraction operation is restricted. Then, the upper end connecting member 16 is forcibly pushed down (in the direction of the arrow in FIG. 4) while the leading ends of the extension portions 22c and 32c come into contact with each other and reach the screen storage position from the level where the contraction operation is restricted. , The pantograph 15 is deformed within the elastic range of its components, causing the pantograph 15 to contract.
[0020]
The amount of deformation of the pantograph in the left-right direction within the elastic range described above is such that the extension of the pantograph is about three thousandths of the length of the upper arm or the lower arm having substantially the same length as the pantograph. The length of 22c, 32c is set. The amount of deformation in which the arms are pushed sideways in the process of lowering and contracting to the storage position after the ends of the arms come into contact with each other differs depending on the arm length, but is specifically about 3 mm when the arm length is about 1 m. Is an appropriate amount. In order to enable this deformation, the mounting holes for the upper end connecting pins 25, 35 of the upper arm upper end portions 22b, 32b are elongated holes elongated in the distal direction. When this amount of deformation is set, the lowering of the arm is restricted about 4 ° to about 5 ° before the storage position, so that an unreasonable deformation or plastic deformation does not occur in the mechanism of the pantograph, and an appropriate buffer action is exhibited. Further, the repulsive force due to the elastic deformation serves as a means for assisting the urging force of the extension urging means of the pantograph when the screen is pulled out.
[0021]
As an adjusting means for reliably exerting the above function, the pantograph pivots the upper and lower arms 21, 22, and 31, 32 upward and downward with respect to the bending and extending portions 23a, 33a of the upper and lower arms via the intermediate connecting pins 23, 33. The angle of the upper arm in the front-rear direction can be corrected at the connecting part to the lower arm 21, 31 which is connected to the lower arm 21, 31 which is pivotally connected (in the example shown, the upper end 21a, 31a above the lower arm 21, 31). Function.
[0022]
Specifically, the connecting members 21a and 31a attached to the distal ends of the left and right lower arms 21 and 31 respectively have the same symmetrical shape, and one of the connecting members 21a is shown in FIG. The connecting member 21a is formed of a groove-shaped member having an outer plate in contact with the outer surface of the distal end of the member of the lower arm 21, and a front and rear side plate facing the front and rear side surfaces of the distal end of the lower arm 21 with a slight gap. A through-hole for mounting an intermediate connecting pin 23 for connecting the upper arm 22 is formed in a front end portion of the front and rear side plates of the connecting tool 21a, and a lower arm is formed in the center of the outer plate of the connecting tool 21a in the groove. A mounting hole for a fulcrum pin 27 that is swingably connected to the distal end of the member of the lower arm 21 is formed through the outer plate and the front and rear side plates near the mounting hole for the fulcrum pin 27. A plurality of screw holes for adjusting screws 28 for holding and fixing from outside are formed respectively.
[0023]
When connecting the lower arm 21 and the upper arm 22, first, the lower end 21 b of the lower arm 21 is connected to the base member 6 by a lower end connecting pin 24 and pivoted. Next, the connecting tool 21a is rotatably connected to the upper arm end 22a by an intermediate connecting pin 23 so as to be rotatably connected thereto. Then, the tip of the member of the lower arm 21 is inserted into the groove of the connecting member 21a, the outer end thereof is brought into contact with the groove bottom of the connecting member 21a, and the fulcrum pin 27 is inserted from the outer surface of the outer plate to the end of the lower arm member. The upper arm 22 to which the connecting tool 21a is attached with the fulcrum 27 as a fulcrum is connected to the lower arm 21 so as to be able to swing forward and backward. Next, an adjusting screw 28 is screwed into each of the screw holes formed in the outer plate and the front and rear side plates near the fulcrum pin 27 of the connecting tool 21a, and the upper and lower arms 22, 21 are kept in a state where they are correctly overlapped with each other. The lower arm 21 is held and fixed to the connector 21a in this state, and integrated. As described above, the telescopic arm 20 is assembled so that the lower arm 21 and the upper arm 22 bend and extend correctly along the same vertical plane along the left-right direction of the base member 6 with each other. Next, the other telescopic arm 30 facing the telescopic arm 20 is assembled in the same procedure as described above.
[0024]
Finally, when the pantograph 15 is formed by connecting the upper connecting member 16 to the distal ends of the telescopic arms 20 and 30, the left and right telescopic arms 20 and 30 can bend and extend along a common vertical plane. Thereby, when the pantograph 15 descends and contracts and reaches the position just before the storage position, the ends of the extended portions 22c and 32c at the upper ends of the upper arms 22 and 32 are correctly opposed to each other and abut, and the descending contraction of the pantograph 15 is regulated. The buffer mechanism 41 can function correctly. Then, when the connection between the upper and lower arms of the pantograph 15 is disturbed during use and the function of the buffer mechanism 41 is reduced, the adjusting screws 28 of the connecting tools 22a and 32a are adjusted in the same manner as described above. With this adjustment, it is possible to correct the buffer mechanism 41 so that it always functions normally.
[0025]
In the above description, the example in which the connecting tools 21a and 31a provided on the bending portions 23a and 33a of the telescopic arms 20 and 30 of the pantograph 15 are attached to the distal ends of the members of the lower arms 21 and 31 has been described as an example. The connecting members 21a, 31a are formed so as to be attachable to the lower ends of the arm members of the upper arms 22, 32 in the same manner as described above, and the intermediate connecting pin mounting holes at the ends of the connecting members 21a, 31a and the lower arm 21, Attach the intermediate connecting pins 23 and 33 together with the intermediate connecting pin mounting holes formed at the tip of the arm member of No. 31 to connect the two, and connect the upper arms 22 and 32 to the lower arms 21 and 31 in the same procedure as described above. A method of adjusting the swing angle before and after and fixing the swing angle may be adopted.
[0026]
In any of the above methods, if the left and right lower arms 21 and 31 do not substantially coincide with each other in a straight line due to a manufacturing error or the like, and a deviation that is difficult to correct remains, the pantograph 15 descends and contracts. Then, the connecting members 21a, 31a are connected to the distal ends of the arm members so that the upper arms 22, 32 are oriented substantially in a straight line with each other in a state where the distal ends of the upper arm extending portions 22c, 32c are in contact with each other just before the storage position. If the mounting adjustment is performed, the buffer function can be exhibited as in the case described above. .
[0027]
【The invention's effect】
The self-standing screen according to the first aspect of the present invention is arranged such that the upper arm of the substantially rhombic pantograph which supports and vertically expands and contracts the screen further from the connecting portion of the upper connecting member which rotatably connects the upper arm. When the pantograph is lowered and contracted, the distal ends of the extended portions come into contact with each other in front of the screen storage position, so that the pantograph contraction operation is regulated, and the distal ends of the extended portions come into contact with each other. From the level set to the screen storage position, the upper end connecting member is forcibly pushed down, and the pantograph is contracted by being deformed within the elastic range of its constituent members. Regulates the screen from falling even when approaches zero. The elastic deformation of the pantograph component functions as a buffering function when the screen is stored, and also has the effect that when the screen is pulled out, the repulsive force associated with the elastic deformation assists the expansion of the pantograph expansion and urging means.
[0028]
By the way, the cushioning function that regulates the drop of the screen and the assisting function of the pantograph extension and urging when the screen is pulled out will not work reliably if the angle of the upper and lower arms of the pantograph in the front-rear direction is slightly out of order. Requires high precision. Therefore, the self-standing screen according to the second aspect of the present invention is a substantially diamond-shaped pantograph that supports the screen and expands and contracts vertically, and a connecting tool that connects the upper and lower arms to the bending and extending connecting portions of the upper and lower arms so as to be able to open and close vertically. The connecting tool includes a fulcrum pin for supporting the upper arm to be able to deflect back and forth with respect to the lower arm, and an adjustable fixing means for restraining and fixing the front and rear deflection of the upper arm. This makes it possible to easily perform error correction and correction at any time during assembly or when necessary, so that the ends of the upper arms of the pantograph are correctly opposed and abutted, and the upper and lower arms are correctly overlapped and folded. In other words, it can be said that this adjustment mechanism plays an important role in reliably exerting the buffering function when the screen is stored and the assisting function when the screen is pulled out.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a self-supporting screen according to the present invention, and is a view of a state in which the screen is pulled out as viewed from the back.
FIG. 2 is an enlarged view showing a state in which the screen of FIG. 1 is stored.
FIG. 3 is a perspective view of the screen of FIG. 1 as viewed obliquely from above.
4 is an explanatory view of the buffer mechanism of the screen in FIG. 1, showing a state in which the tips of the upper ends of the upper arms are in contact with each other at a position immediately before the screen is stored, and the downward contraction is regulated.
5A and 5B are enlarged partial views of a bending portion of a left arm of the pantograph of the screen of FIG. 1, wherein FIG. 5A is a perspective view as viewed from the front near the center of the pantograph, FIG. 5B is a front view, and FIG. Is shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Self-supporting screen 2 Screen main body 2a Main body frame 3 Spring roll 4 Screen sheet 5 Upper end support bar 6 Base member 6a Screen fixing member 7 Bracket 8,11 Pulley 8a, 11a Support shaft 9,12 Spring 10,13 Wire 14 Spring locking Member 15 Pantograph 16 Upper end connecting member 17 Handle 20, 30 Telescopic arm 21, 31 Lower arm 21a, 31a Connecting tool (end)
21b, 31b Lower ends 22, 32 Upper arms 22a, 32a Ends 22b, 32b Upper ends 22c, 32c Extensions 23, 33 Intermediate connecting pins 23a, 33a Bending and extending parts 24, 34 Lower connecting pins 25, 35 Upper connecting pins 26, 36 wire locking pin 27 fulcrum pin 28 adjusting screw 37 storage case 38 opening / closing lid 39 opening 40 extension urging means 41 buffer mechanism

Claims

屈伸可能に連結した上下アームからなる１対の伸縮アームを左右に対向させてその上下端を上部連結部材と下部ベース部材とに回動可能に連結して垂直に伸縮する略菱形のパンタグラフを構成し、該パンタグラフには伸張付勢手段を設ける一方、巻取収納機構を備えたスクリーンの枠体部を前記ベース部材にまた上端支持バーを前記上部連結部材にそれぞれ水平に取り付け、スクリーンシートが前記パンタグラフとともに伸縮可能に構成した自立式スクリーンであって、前記パンタグラフの上アームには、前記上部連結部材との連結部から更に先端側に延出する延長部を設け、パンタグラフを下降収縮させる際にスクリーン収納位置の手前で前記延長部の先端同士が当接し、パンタグラフの収縮動作が規制され、この延長部先端同士が当接したレベルからスクリーンの収納位置に至る間は、前記パンタグラフの構成部材が弾性域内で変形する事で収縮可能に構成してなる緩衝機構付き自立式スクリーン。A pair of telescopic arms composed of upper and lower arms that are flexibly connected to each other are opposed to each other, and their upper and lower ends are rotatably connected to an upper connecting member and a lower base member to form a substantially rhombic pantograph that expands and contracts vertically. The pantograph is provided with an extension biasing means, while a frame portion of a screen having a winding storage mechanism is horizontally attached to the base member, and an upper end support bar is horizontally attached to the upper connection member. A self-supporting screen configured to be extendable and retractable together with the pantograph, wherein the upper arm of the pantograph is provided with an extension extending further forward from a connection portion with the upper connection member, and when the pantograph is contracted downward. The front ends of the extension portions come into contact with each other just before the screen storage position, and the contraction operation of the pantograph is regulated. During the cushioning mechanism with self-supporting screens constituting member of the pantograph is in retractable configured by being deformed elastically region ranging from the level in the storage position of the screen.

前記パンタグラフは、上下アームの屈伸連結部が上下アームを互いに上下に開閉回動可能に連結する連結具を備えてなり、且つ、前記上下アームいずれかの端部の前記連結具取付部には、下アームに対する上アームの前後方向振れ角を調整して固定する調整手段を備えてなる、請求項１記載の緩衝機構付き自立式スクリーン。The pantograph includes a connecting member that connects the upper and lower arms so that the upper and lower arms can be opened and closed rotatably up and down, and the connecting device mounting portion at one end of the upper and lower arms, 2. The self-supporting screen with a shock absorbing mechanism according to claim 1, further comprising adjusting means for adjusting and fixing a swing angle of the upper arm with respect to the lower arm in the front-rear direction.