JP2000187480A - Opening and closing device for keyboard lid of keyboard musical instrument - Google Patents
Opening and closing device for keyboard lid of keyboard musical instrumentInfo
- Publication number
- JP2000187480A JP2000187480A JP10366914A JP36691498A JP2000187480A JP 2000187480 A JP2000187480 A JP 2000187480A JP 10366914 A JP10366914 A JP 10366914A JP 36691498 A JP36691498 A JP 36691498A JP 2000187480 A JP2000187480 A JP 2000187480A
- Authority
- JP
- Japan
- Prior art keywords
- keyboard
- opening
- lid
- rotary
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Electrophonic Musical Instruments (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、開蓋操作時には鍵
盤蓋を軽快に開けることができ、閉蓋操作時には鍵盤蓋
の急激な落下を阻止するようにした鍵盤楽器における鍵
盤蓋の開閉装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard cover opening / closing device for a keyboard instrument which can open the cover lightly at the time of opening the cover and prevents a rapid fall of the cover at the time of closing the cover. .
【０００２】[0002]
【従来の技術】一般のピアノ、電子ピアノなどの鍵盤楽
器においては、非演奏時に鍵盤部の上部を覆う開閉自在
な鍵盤蓋を備えている。この鍵盤蓋は、長尺で重く、後
端側が蝶番を介して楽器本体側または鍵盤蓋奥に回動自
在に枢着されているため、開閉操作時、特に開蓋操作時
には鍵盤蓋を手で支えて押し上げる必要があるため、大
きな操作力を必要とする。また、閉蓋操作時にはその途
中から重心位置が前方へ移動することにより急激に落下
するようになるため、口棒に激しく当たって大きな衝撃
音を発したり、誤って指を口棒と鍵盤蓋との間に挟むこ
とがあった。2. Description of the Related Art A general keyboard instrument such as a piano or an electronic piano has an openable / closable keyboard cover which covers an upper portion of a keyboard when not playing. This lid is long and heavy, and its rear end is pivotally attached to the instrument body or the back of the lid via hinges. Since it is necessary to support and push up, a large operation force is required. In addition, during the closing operation, the center of gravity moves forward from the middle and it suddenly falls, so it hits the mouth stick violently and generates a loud impact sound, or accidentally touches the finger with the mouth stick and the keyboard lid. Between them.
【０００３】そこで、このような不都合を解決するため
に従来から種々の開閉装置を設け、鍵盤蓋が急激に落下
しないようにしている。例えば特開平８−２１１８６１
号公報には、アップライトピアノの鍵盤蓋に適用した蓋
等の開閉装置が開示されている。この開閉装置は、図８
に示すように回転ダンパー２とアーム３を備え、回転ダ
ンパー２に一体に設けた支持台４を楽器本体の構成部材
である拍子木５の上面に両面接着テープ６またはねじに
よって固定し、アーム３の先端に設けたローラ７を板ば
ね９によって鍵盤蓋８の下面に圧接することにより、閉
蓋操作時においいて開閉装置１による流体の粘性抵抗と
板ばね９により鍵盤蓋８を制動するように構成したもの
である。したがって、ゆっくりと回動させて徐々に閉じ
ることができる。一方、鍵盤蓋８を開けるときは、板ば
ね９が開方向に作用することにより相対的に小さな力で
開けることができる。In order to solve such inconveniences, various opening / closing devices are conventionally provided to prevent the fall of the keyboard cover. For example, JP-A-8-211861
Japanese Patent Application Laid-Open Publication No. H11-216,087 discloses a device for opening and closing a lid or the like applied to a keyboard lid of an upright piano. This switchgear is shown in FIG.
As shown in FIG. 1, a rotary damper 2 and an arm 3 are provided, and a support base 4 provided integrally with the rotary damper 2 is fixed to an upper surface of a clap 5 which is a constituent member of the musical instrument main body with a double-sided adhesive tape 6 or a screw. By pressing the roller 7 provided at the tip against the lower surface of the keyboard lid 8 by the leaf spring 9, the keyboard lid 8 is braked by the viscous resistance of the fluid by the opening / closing device 1 and the leaf spring 9 during the closing operation. It is composed. Therefore, it can be slowly rotated and closed gradually. On the other hand, when the keyboard lid 8 is opened, the leaf spring 9 acts in the opening direction so that the keyboard lid 8 can be opened with a relatively small force.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
た従来の開閉装置１は拍子木５の上面に設置されている
ため演奏時に邪魔になり、演奏性を低下させるという問
題があった。また、このように拍子木５上に設置する構
造は、装置全体が視認されるためスマートさに欠け、ピ
アノのデザイン上好ましくない。また、鍵盤楽器の種類
により鍵盤蓋８の開き角度が異なることがあるので、開
閉装置１の設置位置により開閉装置１の作動点が異なっ
てしまう。このため、全開時における鍵盤蓋８とローラ
７との距離を調整する必要がある。この距離は、閉蓋時
におけるダンパーの作動点との関係で重要な要素であ
る。さらに、板ばね９を回転ダンパー２に組込むと、ダ
ンパー自体の大きさに制約があるため、板ばね９の大き
さ、形状、ばね定数等も制限され、設計上の自由度が低
下するという問題もあった。However, since the above-mentioned conventional opening and closing device 1 is installed on the upper surface of the clap 5, it becomes a hindrance at the time of performance, and there is a problem that the performance is reduced. Further, such a structure that is installed on the clap 5 lacks smartness because the entire device is visible, and is not preferable in design of the piano. Further, since the opening angle of the keyboard lid 8 may vary depending on the type of keyboard instrument, the operating point of the opening and closing device 1 differs depending on the installation position of the opening and closing device 1. For this reason, it is necessary to adjust the distance between the keyboard cover 8 and the roller 7 when fully opened. This distance is an important factor in relation to the operating point of the damper when the lid is closed. Furthermore, when the leaf spring 9 is incorporated into the rotary damper 2, the size of the damper itself is restricted, so that the size, shape, spring constant, and the like of the leaf spring 9 are limited, and the degree of freedom in design is reduced. There was also.
【０００５】本発明は上記した従来の問題を解決するた
めになされたもので、その目的とするところは、演奏性
および外観を損なうことなく、ばねの設計的自由度を増
大させ、小型化を可能にした鍵盤楽器における鍵盤蓋の
開閉装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. It is an object of the present invention to increase the degree of freedom in designing springs and reduce the size without impairing playability and appearance. It is an object of the present invention to provide an opening / closing device for a keyboard cover in a keyboard musical instrument which is made possible.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に第１の発明は、閉蓋操作時に流体の粘性抵抗により鍵
盤蓋を制動する鍵盤楽器における鍵盤蓋の開閉装置にお
いて、拍子木の内部に収納室を形成し、この収納室内に
上端にローラを有する回動アームを備えた回転型緩衝装
置とばねを組込み、前記回動アームを前記拍子木の上面
に形成した開口から上方に突出させ、前記ばねによって
前記回動アームを前記鍵盤蓋が開く方向に付勢し前記ロ
ーラを鍵盤蓋の下面に圧接したことを特徴とする。この
ような構成においては、回転型緩衝装置の拍子木の上方
に突出する部分を少なくすることができるので、演奏時
に邪魔にならず、デザイン的にも美観を損なうことがな
い。回転型緩衝装置は、開蓋動作時において流体の粘性
抵抗が小さい。このとき、ばねは鍵盤蓋を開く方向に作
用しているので、通常よりも小さな操作力で開くことが
できる。一方、回転型緩衝装置は、閉蓋動作時におい
て、流体の粘性抵抗が徐々に大きくなるため、鍵盤蓋の
動きを制動する。このとき、ばねも作用し鍵盤蓋の動き
を制動する。したがって、鍵盤蓋は自重によって加速さ
れずゆっくり閉じる。According to a first aspect of the present invention, there is provided a keyboard cover opening / closing device for a keyboard instrument for braking a keyboard cover by viscous resistance of a fluid at the time of closing the cover. Forming a storage chamber, incorporating a rotary shock absorber and a spring with a rotary arm having a roller at the upper end in the storage chamber, and projecting the rotary arm upward from an opening formed on the upper surface of the clap tree; The rotary arm is biased by a spring in a direction in which the keyboard cover opens, and the roller is pressed against the lower surface of the keyboard cover. In such a configuration, the portion of the rotary shock absorber protruding above the beat tree can be reduced, so that it does not hinder the performance and does not impair the aesthetic appearance in terms of design. The rotary shock absorber has low viscosity resistance of the fluid during the opening operation. At this time, since the spring acts in the direction to open the keyboard cover, the spring can be opened with a smaller operation force than usual. On the other hand, the rotary shock absorber brakes the movement of the keyboard lid during the closing operation because the viscous resistance of the fluid gradually increases. At this time, a spring also acts to brake the movement of the keyboard cover. Therefore, the lid closes slowly without being accelerated by its own weight.
【０００７】第２の発明は、上記第１の発明において、
ばねは一端が回動アームに連結され、他端が収納室に固
定されていることを特徴とする。このような構成におい
て、ばねは回転型緩衝装置に組み込まれていないので、
ばね力等の設計的自由度が増大するとともに、回転型緩
衝装置を小型化することができる。[0007] A second invention is the first invention, wherein
The spring is characterized in that one end is connected to the rotating arm and the other end is fixed to the storage chamber. In such a configuration, the spring is not incorporated into the rotary shock absorber,
The degree of freedom in design such as spring force is increased, and the size of the rotary shock absorber can be reduced.
【０００８】[0008]
【発明の実施の形態】以下、本発明を図面に示す実施の
形態に基づいて詳細に説明する。図１は本発明に係る鍵
盤蓋の開閉装置を備えたアップライトピアノの要部を示
開蓋時における外観斜視図、図２は同開閉装置が組み込
まれた鍵盤部の閉蓋時における断面図、図３は開閉装置
の一部を破断して示す側面図、図４は回転型緩衝装置の
正面図、図５は同緩衝装置の断面図、図６は図５のＶＩ
−ＶＩ線拡大断面図、図７は回転連結子の斜視図であ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a perspective view showing an essential part of an upright piano provided with a keyboard cover opening / closing device according to the present invention when the cover is opened, and FIG. 2 is a cross-sectional view showing a keyboard portion incorporating the same opening / closing device when the cover is closed. , FIG. 3 is a side view showing a part of the opening / closing device cut away, FIG. 4 is a front view of the rotary shock absorber, FIG. 5 is a sectional view of the shock absorber, and FIG.
FIG. 7 is an enlarged sectional view taken along the line VI, and FIG. 7 is a perspective view of the rotary connector.
【０００９】図１および図２において、アップライトピ
アノ２０は、楽器本体２１を構成する左右一対の親板２
２（一方のみ示す）と、各親板２２に前方に向かって突
設された左右一対の腕木２３（一方のみ示す）と、これ
らの腕木２３間に横架された棚板２４と、この棚板２４
の前端に設けられた口棒２５と、上前板２６と、図示し
ない下前板、天板、底板等を備え、棚板２４上に白鍵と
黒鍵からなる８８個の鍵盤２７と、鍵盤筬２８と左右一
対の拍子木５が配設されている。また、棚板２４は左右
一対の脚柱２９によって支持され、上方には鍵盤部Ａを
覆う開閉自在な鍵盤蓋８が設けられている。In FIGS. 1 and 2, an upright piano 20 includes a pair of left and right master plates 2 constituting a musical instrument body 21.
2 (only one is shown), a pair of left and right arms 23 (only one is shown) projecting forward from each master plate 22, a shelf board 24 laid between these arms 23, and this shelf Board 24
A mouth stick 25 provided at the front end of the, an upper front plate 26, a lower front plate, a top plate, a bottom plate and the like (not shown), and 88 keys 27 including a white key and a black key on a shelf plate 24; A keyboard reed 28 and a pair of left and right claps 5 are provided. The shelf board 24 is supported by a pair of right and left pillars 29, and an openable and closable keyboard cover 8 that covers the keyboard portion A is provided above.
【００１０】前記鍵盤蓋８は、下面側に譜面板３３が取
付けられた平板状の蓋本体８Ａと、この蓋本体８Ａの前
端に蝶番３２によって折畳み自在に取付けられた前板８
Ｂとで構成され、蓋本体８Ａの後端が蝶番３０によって
鍵盤蓋奥３１の前端に上下方向に回動自在に枢着されて
いる。鍵盤蓋８の開閉角度は、例えば１３０°程度であ
り、閉蓋状態において前板８Ｂの下面が口棒２５の上面
に当接することにより図２に示すように略水平な状態に
保持され、最大角度開くと、蓋本体８Ａの前端部表面が
前記上前板２６の表面に設けたゴムボタン３４に当接し
て支承される。The keyboard lid 8 has a flat lid body 8A having a music score plate 33 attached to the lower surface thereof, and a front plate 8 attached to the front end of the lid body 8A by a hinge 32 so as to be freely foldable.
B, and the rear end of the lid body 8A is hinged to the front end of the back 31 of the keyboard lid by a hinge 30 so as to be vertically rotatable. The opening / closing angle of the keyboard lid 8 is, for example, about 130 °. In the closed state, the lower surface of the front plate 8B abuts on the upper surface of the mouthpiece 25, so that it is held in a substantially horizontal state as shown in FIG. When opened at an angle, the front end surface of the lid main body 8A comes into contact with and is supported by a rubber button 34 provided on the surface of the upper front plate 26.
【００１１】前記拍子木５の内部には、本発明に係る鍵
盤蓋の開閉装置４０が一部を上方に突出させて組み込ま
れている。この開閉装置４０は、閉蓋動作時に鍵盤蓋８
を制動し急激な落下を防止する回転型緩衝装置４１と、
この回転型緩衝装置４１を介して鍵盤蓋８を開く方向に
付勢する圧縮コイルばね４２とを備えている。このた
め、前記拍子木５の内部には、前記回転型緩衝装置４１
と圧縮コイルばね４２を収納する収納室４３が形成さ
れ、また上面後端部寄りには収納室４３に連通する開口
４４が形成されている。Inside the clap 5, a keyboard cover opening / closing device 40 according to the present invention is incorporated with a part protruding upward. The opening / closing device 40 is used to open the keyboard cover 8 during the closing operation.
A rotary shock absorber 41 for braking and preventing a sharp drop,
A compression coil spring 42 for urging the keyboard cover 8 in the opening direction via the rotary shock absorber 41 is provided. Therefore, the rotary shock absorber 41 is provided inside the clap 5.
And a storage chamber 43 for storing the compression coil spring 42, and an opening 44 communicating with the storage chamber 43 is formed near the rear end of the upper surface.
【００１２】図３〜図７において、前記回転型緩衝装置
４１は、流体の粘性抵抗を利用したもので、円筒状のダ
ンパーケース４５と、このダンパーケース４５の下部に
一体的に設けられた取付部４６とを備え、ダンパーケー
ス４５の上部と後述する回動レバー４８を前記開口部４
４から拍子木５の上方に突出させて前記取付部４６が前
記収納室４３内に図示しない複数個のねじによって固定
されている。したがって、回転型緩衝装置４１の下部側
が拍子木５に埋設されているといえる。3 to 7, the rotary shock absorber 41 utilizes the viscous resistance of a fluid, and has a cylindrical damper case 45 and a mounting member integrally provided below the damper case 45. And an upper portion of a damper case 45 and a rotating lever 48 described later are connected to the opening 4.
The mounting part 46 is fixed to the storage chamber 43 by a plurality of screws (not shown) so as to protrude from the upper part 4 of the clasp 5. Therefore, it can be said that the lower side of the rotary shock absorber 41 is buried in the clap 5.
【００１３】前記ダンパーケース４５は、一端が開放す
る筒状体に形成され、内部に非圧縮性のダンピングオイ
ル５０が封入されるとともに回動軸５１がＯリング５２
を介して回動自在に配設され、開口端部に回動軸５１の
抜けを防止するリング５３が嵌合されている。The damper case 45 is formed in a cylindrical body having an open end, in which an incompressible damping oil 50 is sealed, and a rotating shaft 51 is connected to an O-ring 52.
A ring 53 for preventing rotation of the rotating shaft 51 is fitted to the opening end.
【００１４】また、ダンパーケース４５の内周面にはス
トッパ５４が中心に向かって一体に突設されており、先
端面が前記回動軸５１の外周面に近接して対向、好まし
くはダンピングオイル５０の通路を形成しないように相
対的に摺動可能な状態で接触している。A stopper 54 is integrally formed on the inner peripheral surface of the damper case 45 so as to protrude toward the center. The contacts are relatively slidable so as not to form 50 passages.
【００１５】前記回動軸５１は、一端が閉塞した異径の
筒状体に形成されることにより、閉塞端側が小径部５１
Ａ、開放端側が大径部５１Ｂを形成しており、小径部５
１Ａの端面に円柱状の突起部５６が一体に突設されてい
る。この突起部５６は、中心を回動軸５１の中心と一致
させて設けられ、前記ダンパーケース４５の閉塞端側内
面に形成した軸受穴５７に回動自在に嵌合されている。
また、回動軸５１の小径部５１Ａの外周面には、径方向
に伸びる羽根５８が一体に突設されるとともに、この羽
根５８の先端部に可動弁６０が設けられている。そし
て、これらの回動軸５１、羽根５８、可動弁６０および
前記ストッパ５４によって前記ダンパーケース４５の内
部を図６に示すように２つの室、すなわち第１、第２の
緩衝室６１Ａ，６１Ｂに仕切っている。The rotary shaft 51 is formed in a cylindrical body of a different diameter with one end closed, so that the closed end side has a small diameter portion 51.
A, the open end side forms the large diameter portion 51B, and the small diameter portion 5B.
A columnar projection 56 is integrally provided on the end face of 1A. The protrusion 56 is provided so that the center thereof coincides with the center of the rotation shaft 51, and is rotatably fitted in a bearing hole 57 formed on the inner surface of the damper case 45 on the closed end side.
A blade 58 extending in the radial direction is integrally provided on the outer peripheral surface of the small diameter portion 51A of the rotating shaft 51, and a movable valve 60 is provided at a tip end of the blade 58. Then, the interior of the damper case 45 is divided into two chambers, that is, first and second buffer chambers 61A and 61B as shown in FIG. 6 by the rotation shaft 51, the blade 58, the movable valve 60 and the stopper 54. Partitioning.
【００１６】前記羽根５８は、小径部５１Ａの全長にわ
たって延在し、先端の適宜箇所に第１、第２の緩衝室６
１Ａ，６１Ｂを連通させる流体通路６２が形成されてい
る。The blade 58 extends over the entire length of the small diameter portion 51A, and the first and second buffer chambers 6 are provided at appropriate locations at the tip.
A fluid passage 62 is formed to communicate the fluid passages 1A and 61B.
【００１７】前記可動弁６０は、前記ダンパーケース４
５の内周面に沿って前記羽根５８とともに一体的に回動
するもので、羽根５８と同一長さを有している。また、
回動軸５１の軸線と直交する面内の断面形状がコ字状を
呈することにより、羽根５８を挟んで互いに対向する一
対の側壁部６０Ａ，６０Ｂと、これらの側壁部６０Ａ，
６０Ｂの基部を連結しダンパーケース４５の内周面に沿
って摺動する連結部６０Ｃとからなり、前記羽根５８の
先端部が回動軸５１の回動方向に適宜な遊びをもって係
入される凹部６５を有している。前記一対の側壁部６０
Ａ，６０Ｂには、断面積の異なる流体通路６３，６４が
前記羽根５８の流体通路６２に対応してそれぞれ形成さ
れている。具体的には、鍵盤蓋８が閉じる方向（図６反
時計方向）に回動軸５１が回動するときの閉方向側の側
壁部６０Ａに形成されている流体通路６３は、断面積が
きわめて小さい小孔とされ、鍵盤蓋８が開く方向（図６
時計方向）に回動軸５１が回動するときの開方向側の側
壁部６０Ｂの流体通路６４は前記流体通路６３よりも十
分大きく設定され、前記羽根５８の流体通路６２と略同
一の断面積を有している。The movable valve 60 is connected to the damper case 4.
5, which integrally rotates with the blade 58 along the inner peripheral surface thereof and has the same length as the blade 58. Also,
Since the cross-sectional shape in a plane orthogonal to the axis of the rotating shaft 51 has a U-shape, a pair of side walls 60A and 60B facing each other with the blade 58 interposed therebetween, and these side walls 60A, 60A,
A connecting portion 60C that connects the base portion of the damper case 45 and slides along the inner peripheral surface of the damper case 45. The tip of the blade 58 is engaged with the play in the rotating direction of the rotating shaft 51 with appropriate play. It has a recess 65. The pair of side wall portions 60
Fluid passages 63 and 64 having different cross-sectional areas are formed in A and 60B corresponding to the fluid passage 62 of the blade 58, respectively. Specifically, the fluid passage 63 formed in the side wall portion 60A on the closing direction when the rotating shaft 51 rotates in the direction in which the keyboard lid 8 closes (counterclockwise direction in FIG. 6) has a very large cross-sectional area. The direction in which the keyboard cover 8 opens is a small hole (FIG. 6).
The fluid passage 64 of the side wall portion 60B on the opening direction when the rotating shaft 51 rotates clockwise) is set to be sufficiently larger than the fluid passage 63, and has substantially the same cross-sectional area as the fluid passage 62 of the blade 58. have.
【００１８】このように側壁部６０Ａ，６０Ｂの流体通
路６３，６４の断面積を異ならせておくと、回動軸５１
の回動方向に応じてダンピングオイル５０の粘性抵抗、
言い換えれば回転抵抗を変えることができる。すなわ
ち、回動軸５１が図６において閉方向に回動するとき
は、羽根５８の先端部が閉方向側の側壁部６０Ａの内面
に当接して回動する。このとき、第１の緩衝室６１Ｂ内
のダンピングオイル５０は流体通路６３−流体通路６２
−羽根５８と側壁部６０Ｂとの隙間−流体通路６４を通
って第２の緩衝室６１Ｂに移動する。このときのダンピ
ングオイル５０の粘性抵抗は、流体通路６３の断面積が
きわめて小さいことから大きくなり、非常に大きな回転
トルクを発生することになる。一方、回動軸５１が開方
向に回動するときは、羽根５８の先端部が開方向側の側
壁部６０Ｂの内面に当接して回動する。このとき、第２
の緩衝室６１Ｂ内のダンピングオイル５０は流体通路６
４−流体通路６２−羽根５８と側壁部６０Ａの隙間を通
ってその大部分が第１の緩衝室６１Ａに移動する。した
がって、このときのダンピングオイル５０の粘性抵抗は
小さく、回転トルクは殆ど発生しない。この結果、回転
型緩衝装置４１は、回動軸５１が開方向に回動するとき
はダンパー機能（制動機能）を発揮せず、閉方向に回動
するときのみダンパー機能を発揮する。なお、流体通路
６３の断面積によって回転トルクを自在に変えることが
でき、小さくすればする程大きな回転トルクが得られ
る。If the cross-sectional areas of the fluid passages 63 and 64 of the side wall portions 60A and 60B are made different from each other, the rotation shaft 51
Viscous resistance of the damping oil 50 according to the rotation direction of
In other words, the rotation resistance can be changed. That is, when the rotation shaft 51 rotates in the closing direction in FIG. 6, the tip of the blade 58 contacts the inner surface of the side wall 60A on the closing direction and rotates. At this time, the damping oil 50 in the first buffer chamber 61B is transferred from the fluid passage 63 to the fluid passage 62.
The gap between the blade 58 and the side wall portion 60B moves to the second buffer chamber 61B through the fluid passage 64. At this time, the viscous resistance of the damping oil 50 increases because the cross-sectional area of the fluid passage 63 is extremely small, and a very large rotational torque is generated. On the other hand, when the rotation shaft 51 rotates in the opening direction, the tip of the blade 58 contacts the inner surface of the side wall 60B on the opening direction side and rotates. At this time, the second
The damping oil 50 in the buffer chamber 61 </ b> B
4-Fluid passage 62-Most of the fluid moves through the gap between the blade 58 and the side wall 60A to the first buffer chamber 61A. Therefore, the viscous resistance of the damping oil 50 at this time is small, and almost no rotational torque is generated. As a result, the rotary shock absorber 41 does not perform the damper function (braking function) when the rotating shaft 51 rotates in the opening direction, and performs the damper function only when rotating in the closing direction. The rotational torque can be freely changed depending on the cross-sectional area of the fluid passage 63, and the smaller the smaller, the higher the rotational torque.
【００１９】図５および図７において、前記回動軸５１
の開口部６７には回転連結子６８が抜けを防止されて挿
抜可能に嵌合され、かつ圧縮コイルばね６９によって突
出する方向に付勢されている。この回転連結子６８は、
一端が開放する角形の筒状体に形成され、閉塞側端部６
８Ａが回動アーム４８の軸部を形成し前記開口部６７か
ら外部に突出している。また、４つの側面のうち１つの
側面には円弧状の凸部からなる抜け防止部７０が一体に
突設されている。前記開口部６７は、完全な円形ではな
く、両端が平坦で回動軸５１が嵌合し得る長円形に形成
され、これによって回動軸５１と回転連結子６８を一体
に回転させるようにしている。In FIG. 5 and FIG.
The rotation connector 68 is fitted in the opening 67 so that it can be inserted and withdrawn while being prevented from coming off, and is urged in a projecting direction by a compression coil spring 69. This rotary connector 68
The closed end 6 is formed in a rectangular cylindrical body whose one end is open.
8A forms a shaft portion of the rotating arm 48 and protrudes from the opening 67 to the outside. Further, on one of the four side surfaces, a detachment prevention portion 70 formed of an arc-shaped convex portion is integrally provided. The opening 67 is not formed in a perfect circle, but is formed in an oval shape in which both ends are flat and the rotation shaft 51 can be fitted, so that the rotation shaft 51 and the rotation connector 68 are integrally rotated. I have.
【００２０】図３〜図５において、前記回動アーム４８
は、前記ダンパーケース４５に上方から嵌合する基部４
８Ａと、細長いアーム部４８Ｂと、一対のばね係止部４
８Ｃとで構成されている。Referring to FIGS.
Is a base 4 fitted into the damper case 45 from above.
8A, an elongated arm portion 48B, and a pair of spring locking portions 4
8C.
【００２１】前記基部４８Ａは、半円筒板７２ａと、こ
の半円筒板７２ａの軸線方向の両端に互いに対向するよ
うに連接された一対の側板７２ｂ，７２ｃとからなり、
前記ダンパーケース４５の外周面に回動自在に嵌合され
ている。また、この基部４８Ａは、カバー７１によって
覆われており、上端部が前記アーム部４８Ｂとともに前
記開口４４から拍子木５の上方に突出している。The base 48A comprises a semi-cylindrical plate 72a and a pair of side plates 72b and 72c connected to both ends of the semi-cylindrical plate 72a in the axial direction so as to face each other.
The outer peripheral surface of the damper case 45 is rotatably fitted. The base portion 48A is covered with a cover 71, and the upper end portion of the base portion 48A and the arm portion 48B protrudes from the opening 44 above the clasp 5.
【００２２】前記一対の側板７２ｂ，７２ｃには、軸受
孔７３，７４がそれぞれ形成されている。一方の側板７
２ｂの軸受孔７３は丸穴からなり、前記ダンパーケース
４５の閉塞端面に突設した円筒状の凸部からなる軸部７
５に回転自在に嵌合されている。他方の側板７２ｃの軸
受孔７４は角穴からなり、前記回転連結子６８の閉塞端
部６８Ａが嵌合している。したがって、回動アーム４８
は前記ダンパーケース４５に対しては回転自在である
が、前記回転連結子６８および回動軸５１とともに一体
的に回動するように構成されている。回動アーム４８の
回動角度θ（図３）は、本実施の形態においては略１１
０°であるが、この角度θは前記回動軸５１の回動角度
によって自由に設定することができる。また、垂直な状
態から後方側への回動角度αは０〜２０°程度である。
なお、回転連結子６８は、前記抜け防止部７０の先端面
が前記側板７２ｃの内面に前記圧縮コイルばね６９によ
って圧接されることにより、前記軸受孔７４からの抜け
を防止されている。Bearing holes 73, 74 are formed in the pair of side plates 72b, 72c, respectively. One side plate 7
2b is a bearing hole 73 formed of a round hole, and a shaft portion 7 formed of a cylindrical protrusion protruding from the closed end face of the damper case 45.
5 is rotatably fitted. The bearing hole 74 of the other side plate 72c is a square hole, and the closed end 68A of the rotary connector 68 is fitted. Therefore, the rotating arm 48
Is rotatable with respect to the damper case 45, but is configured to rotate integrally with the rotary connector 68 and the rotary shaft 51. The rotation angle θ of the rotation arm 48 (FIG. 3) is approximately 11 in this embodiment.
Although the angle θ is 0 °, the angle θ can be freely set by the rotation angle of the rotation shaft 51. The rotation angle α from the vertical state to the rear side is about 0 to 20 °.
The rotation connector 68 is prevented from falling out of the bearing hole 74 by the compression coil spring 69 pressing the distal end surface of the release prevention portion 70 against the inner surface of the side plate 72c.
【００２３】前記アーム部４８Ｂは、前記半円筒板７２
ａの表面中央部に一体に突設され、先端部の後面側に設
けた凹部７７内に回転自在なローラ７６が取付けられて
いる。The arm 48B is provided with the semi-cylindrical plate 72
A rotatable roller 76 is mounted in a concave portion 77 provided integrally with the center of the surface of a and protruding from the rear surface of the front end.
【００２４】前記一対のばね係止部４８Ｃは、前記半円
筒板７２ａの内面側に前記アーム部４８Ｂとは反対方向
に向かって一体に突設されることにより、基部４８Ａの
下方に延在し、先端に前記圧縮コイルばね４２の一端側
係止部４２ａが係止されている。The pair of spring locking portions 48C extend below the base portion 48A by integrally projecting from the inner surface of the semi-cylindrical plate 72a in the direction opposite to the arm portion 48B. One end side locking portion 42a of the compression coil spring 42 is locked at the tip.
【００２５】前記圧縮コイルばね４２は、前記回転型緩
衝装置４１より前方に位置するように前記拍子木５の収
納部４３内に略水平に配置され、他端側係止部４２ｂが
図２に示すように拍子木５の内面にねじ７８によって固
定され、コイル部４２ｃが合成樹脂等によって形成され
た振動防止カバー８０に収納されている。そして、この
圧縮コイルばね４２は、図２に示す閉蓋状態において前
記回動アーム４８に時計方向の回動習性を付与すること
により、前記ローラ７６を鍵盤蓋８の下面に圧接してい
る。The compression coil spring 42 is disposed substantially horizontally in the accommodating portion 43 of the beater 5 so as to be located forward of the rotary shock absorber 41, and the other end side locking portion 42b is shown in FIG. As described above, the cladding 5 is fixed to the inner surface of the clap 5 by the screw 78, and the coil portion 42c is housed in the vibration preventing cover 80 formed of synthetic resin or the like. The compression coil spring 42 presses the roller 76 against the lower surface of the keyboard cover 8 by imparting clockwise rotation behavior to the rotation arm 48 in the closed state shown in FIG.
【００２６】次に、上記した開閉装置４０の動作につい
て説明する。鍵盤蓋８は、開閉角度が略１３０°で、閉
蓋時において口棒２６に当接し略水平な状態に保持され
ている。回転型緩衝装置４１は閉蓋時において、図２に
示す状態に保持されている。この状態において、回動ア
ーム４８のアーム部４８Ｂは略水平に保持され、ばね係
止部４８Ｃはダンパーケース４５の後方に位置してい
る。したがって、圧縮コイルばね４２は伸長した状態に
設定保持され、回動アーム４８に時計方向の回転力を付
与し、ローラ７６を鍵盤蓋８の下面に圧接している。な
お、圧縮コイルばね４２は、回動アーム４８が回動して
略垂直な状態になると、短縮して殆ど自然長に戻り、ば
ね力が殆ど消滅する。Next, the operation of the switching device 40 will be described. The keyboard lid 8 has an opening / closing angle of approximately 130 °, and is in contact with the mouth stick 26 when the lid is closed, and is held in a substantially horizontal state. When the lid is closed, the rotary shock absorber 41 is held in the state shown in FIG. In this state, the arm portion 48B of the rotating arm 48 is held substantially horizontally, and the spring locking portion 48C is located behind the damper case 45. Therefore, the compression coil spring 42 is set and held in an extended state, applies a clockwise rotating force to the rotating arm 48, and presses the roller 76 against the lower surface of the keyboard lid 8. When the rotating arm 48 is rotated to be substantially vertical, the compression coil spring 42 is shortened and almost returns to its natural length, and the spring force almost disappears.
【００２７】この状態より鍵盤蓋８を手で徐々に開いて
いくと、回動アーム４８は圧縮コイルばね４２のばね力
によって図２および図６において開方向に回動し、鍵盤
蓋８を押し上げるように作用する。このとき、回転型緩
衝装置４１は、ダンピングオイル５０の粘性抵抗が小さ
いため殆ど機能しない。したがって、緩衝装置を備えて
いない従来のピアノの鍵盤蓋を開くときよりも、圧縮コ
イルばね４２のばね力だけ小さい操作力で開くことがで
き、図２に二点鎖線で示すように上前板２６の前面に立
て掛けることができる。このばね力は、開蓋操作時の初
期において最大で、開くにしたがって徐々に減少し、鍵
盤蓋８が略垂直な状態にまで開くと殆どゼロになる。こ
れは、鍵盤蓋８が垂直な状態を過ぎて後方に傾くとき、
重心の移動のみによって回動させ、圧縮コイルばね４２
のばね力によって加速しないようにするためである。When the keyboard cover 8 is gradually opened by hand from this state, the rotating arm 48 is rotated in the opening direction in FIGS. 2 and 6 by the spring force of the compression coil spring 42 and pushes up the keyboard cover 8. Act like so. At this time, the rotary shock absorber 41 hardly functions because the viscous resistance of the damping oil 50 is small. Therefore, it can be opened with an operating force smaller by the spring force of the compression coil spring 42 than when the keyboard cover of a conventional piano having no shock absorber is opened, and as shown by a two-dot chain line in FIG. 26 can lean against the front. This spring force is maximum in the initial stage of the cover opening operation, gradually decreases as the cover is opened, and becomes almost zero when the keyboard cover 8 is opened to a substantially vertical state. This is because when the lid 8 leans backward past the vertical
The compression coil spring 42 is rotated only by moving the center of gravity.
This is to prevent the spring force from accelerating.
【００２８】鍵盤蓋８が完全に開いた状態において、鍵
盤蓋８は垂直面に対して後方に略３０°の角度をもって
傾斜し、回動アームは角度α（α≒０〜２０°）だけ後
方に傾斜している。この状態において、ローラ７６は鍵
盤蓋８から離間していることが好ましい。これは、閉蓋
操作時の初期において回転型緩衝装置４１が鍵盤蓋８を
制動しないようにするためである。また、圧縮コイルば
ね４２は鍵盤蓋８が略垂直な状態になるまでは殆ど作用
しないため、鍵盤蓋８を従来の鍵盤蓋を閉じるときと略
等しい操作力で略垂直な状態になるまで回動させること
ができる。When the cover 8 is completely opened, the cover 8 is inclined rearward at an angle of about 30 ° with respect to the vertical plane, and the rotating arm is rearward by an angle α (α ≒ 0 to 20 °). It is inclined. In this state, the roller 76 is preferably separated from the keyboard lid 8. This is to prevent the rotary shock absorber 41 from braking the keyboard cover 8 at the initial stage of the closing operation. Further, since the compression coil spring 42 hardly acts until the keyboard cover 8 is substantially vertical, the keyboard cover 8 is rotated until the keyboard cover 8 becomes substantially vertical with the same operating force as when closing the conventional keyboard cover. Can be done.
【００２９】鍵盤蓋８が前方に回動してローラ７６に接
触すると、回動アーム４８は鍵盤蓋８の重みによって閉
方向に回動する。また、回動アーム４８の回動に伴い回
動軸５１も閉方向に回動するため、回転型緩衝装置４１
が鍵盤蓋８に対して大きな回転抵抗として作用し、言い
換えばダンパー機能が働き鍵盤蓋８の動きを制動する。
また、回動アーム４８が閉方向に回動すると、圧縮コイ
ルばね４２は徐々に伸長してばね力が増大し緩衝装置４
１と協労して鍵盤蓋８を制動する。したがって、鍵盤蓋
８は自重によって加速されず、ゆっくり閉じて口棒２５
に当接する。When the keyboard lid 8 rotates forward and comes into contact with the roller 76, the rotating arm 48 rotates in the closing direction due to the weight of the keyboard lid 8. In addition, the rotation shaft 51 also rotates in the closing direction with the rotation of the rotation arm 48, so that the rotary shock absorber 41 is rotated.
Acts as a large rotational resistance on the keyboard lid 8, in other words, the damper function works to brake the movement of the keyboard lid 8.
When the rotating arm 48 rotates in the closing direction, the compression coil spring 42 gradually expands, the spring force increases, and the shock absorber 4
The keyboard lid 8 is braked in cooperation with 1. Therefore, the keyboard lid 8 is not accelerated by its own weight, but closes slowly and
Abut.
【００３０】ここで、本発明においては、開閉装置４０
を拍子木５の内部に一部を突出させた状態で埋設してい
るので、上記した特開平８−２１１８６１号公報に開示
された開閉装置に比べて演奏時の邪魔にならず、ピアノ
の演奏性を向上させることができる。また、拍子木５の
上方に突出している部分は、回動アーム４８のカバー７
１によって覆われている基部４８Ａの上端部とアーム部
４８Ｂだけであるため、ピアノの外観を損なうことも少
ない。Here, in the present invention, the switching device 40
Is partially buried inside the clap 5 so that it does not hinder the performance as compared with the opening / closing device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. H8-211861. Can be improved. The portion projecting above the clasp 5 is the cover 7 of the rotating arm 48.
Since only the upper end portion of the base portion 48A and the arm portion 48B covered by 1 are provided, the appearance of the piano is hardly impaired.
【００３１】また、回動アーム４８に開方向の回動習性
を付与する圧縮コイルばね４２を回転型緩衝装置４１の
内部に組み込んでいないので、圧縮コイルばね４２に対
する制約が少なく、ばね力、大きさ、長さ等を自由に変
更することができる。特に、全開時における鍵盤蓋８と
ローラ７６との距離の調整が容易になる。また、回転型
緩衝装置４１は圧縮コイルばね４２が組込まれていない
ので、小型化することができる。Further, since the compression coil spring 42 for imparting the opening behavior to the rotation arm 48 is not incorporated in the rotary shock absorber 41, there is little restriction on the compression coil spring 42, and the spring force and the size are large. The length and the like can be freely changed. In particular, it is easy to adjust the distance between the keyboard lid 8 and the roller 76 when fully opened. Further, since the compression coil spring 42 is not incorporated in the rotary shock absorber 41, the size can be reduced.
【００３２】なお、鍵盤楽器の機種によりローラ７６の
位置を調整したものを用意しておけば、拍子木５の交換
だけで既存の機種にも組込むことができる。By preparing a device in which the position of the roller 76 is adjusted according to the model of the keyboard instrument, it is possible to incorporate it into an existing model only by replacing the clap 5.
【００３３】[0033]
【発明の効果】以上説明したように本発明に係る鍵盤楽
器における鍵盤蓋の開閉装置によれば、拍子木に一部を
埋設したので、拍子木の上方に突出している部分が少な
く、演奏時に邪魔にならず演奏性を向上させることがで
きる。また、見た目もすっきりし鍵盤楽器のデザインを
損なうことがない。As described above, according to the keyboard cover opening / closing device of the keyboard instrument according to the present invention, since a part is buried in the clapboard, there are few portions protruding above the clapboard, so that it does not interfere with the performance. Instead, the performance can be improved. In addition, the appearance is neat and does not impair the design of the keyboard instrument.
【００３４】また、本発明は、ばねとして圧縮コイルば
ねを用い、振動防止カバーによって覆っているので、演
奏時に振動して耳障りな雑音を発することがない。さら
に、圧縮コイルばねを回転型緩衝装置に外付けしている
ので、緩衝装置の小型化を可能にするとともに、ばねの
設計的自由度を増大させることができる。In the present invention, since a compression coil spring is used as the spring and the spring is covered by the vibration preventing cover, it does not vibrate during playing and generate harsh noise. Further, since the compression coil spring is externally attached to the rotary type shock absorber, the size of the shock absorber can be reduced, and the degree of freedom in designing the spring can be increased.
【図１】 本発明に係る鍵盤蓋の開閉装置を備えたアッ
プライトピアノの要部を示す開蓋時における外観斜視図
である。FIG. 1 is an external perspective view showing an essential part of an upright piano provided with a keyboard cover opening / closing device according to the present invention when the cover is opened.
【図２】 同開閉装置が組み込まれた鍵盤部の閉蓋時に
おける断面図である。FIG. 2 is a cross-sectional view of the keyboard in which the opening / closing device is incorporated when the lid is closed.
【図３】 開閉装置の一部を破断して示す側面図であ
る。FIG. 3 is a side view showing a part of the opening / closing device in a cutaway manner.
【図４】 回転型緩衝装置の正面図である。FIG. 4 is a front view of the rotary shock absorber.
【図５】 同緩衝装置の断面図である。FIG. 5 is a sectional view of the shock absorber.
【図６】 図５のＶＩ−ＶＩ線拡大断面図である。FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. 5;
【図７】 回転連結子の斜視図である。FIG. 7 is a perspective view of a rotary connector.
【図８】 従来の開閉装置の斜視図である。FIG. 8 is a perspective view of a conventional opening / closing device.
５…拍子木、８…鍵盤蓋、４０…開閉装置、４１…回転
型緩衝装置、４２…圧縮コイルばね、４３…収納室、４
４…開口、４５…ダンパーケース、４８…回動アーム、
５０…ダンピングオイル、５１…回動軸、７６…ロー
ラ。Reference numeral 5: beat tree, 8: keyboard cover, 40: opening / closing device, 41: rotary shock absorber, 42: compression coil spring, 43: storage room, 4
4 ... opening, 45 ... damper case, 48 ... rotating arm,
50: damping oil, 51: rotating shaft, 76: roller.
Claims (2)
蓋を制動する鍵盤楽器における鍵盤蓋の開閉装置におい
て、 拍子木の内部に収納室を形成し、この収納室内に上端に
ローラを有する回動アームを備えた回転型緩衝装置とば
ねを組込み、前記回動アームを前記拍子木の上面に形成
した開口から上方に突出させ、前記ばねによって前記回
動アームを前記鍵盤蓋が開く方向に付勢し前記ローラを
鍵盤蓋の下面に圧接したことを特徴とする鍵盤楽器にお
ける鍵盤蓋の開閉装置。An opening / closing apparatus for a keyboard instrument for braking a keyboard lid by viscous resistance of a fluid during a closing operation, wherein a storage chamber is formed inside a beat tree, and a rotation is provided inside the storage chamber with a roller at an upper end. A rotary shock absorber with an arm and a spring are assembled, the rotary arm is projected upward from an opening formed on the upper surface of the clap, and the spring biases the rotary arm in a direction in which the keyboard cover opens. A keyboard cover opening / closing device for a keyboard instrument, wherein the roller is pressed against a lower surface of the keyboard cover.
の開閉装置において、 ばねは一端が回動アームに連結され、他端が収納室に固
定されていることを特徴とする鍵盤楽器における鍵盤蓋
の開閉装置。2. The keyboard for a keyboard instrument according to claim 1, wherein one end of the spring is connected to the pivot arm and the other end is fixed to the storage chamber. Lid opening and closing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36691498A JP3856274B2 (en) | 1998-12-24 | 1998-12-24 | Opening and closing device for keyboard lid in keyboard instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36691498A JP3856274B2 (en) | 1998-12-24 | 1998-12-24 | Opening and closing device for keyboard lid in keyboard instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000187480A true JP2000187480A (en) | 2000-07-04 |
| JP3856274B2 JP3856274B2 (en) | 2006-12-13 |
Family
ID=18488006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36691498A Expired - Fee Related JP3856274B2 (en) | 1998-12-24 | 1998-12-24 | Opening and closing device for keyboard lid in keyboard instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3856274B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007132509A (en) * | 2005-10-12 | 2007-05-31 | Tok Bearing Co Ltd | Shock absorber using rotary damper |
| KR100863385B1 (en) * | 2006-03-06 | 2008-10-13 | 야마하 가부시키가이샤 | Musical instrument |
| JP2013019970A (en) * | 2011-07-07 | 2013-01-31 | Yamaha Corp | Lid body opening/closing structure of keyboard instrument |
| JP2013019969A (en) * | 2011-07-07 | 2013-01-31 | Yamaha Corp | Lid body opening/closing structure of keyboard instrument |
| US20150179151A1 (en) * | 2013-12-24 | 2015-06-25 | Casio Computer Co., Ltd. | Keyboard lid opening and closing apparatus and keyboard instrument |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101824086B1 (en) | 2016-07-07 | 2018-01-31 | 인하대학교 산학협력단 | Magneto-rheological fluid brake system having increased brake torque |
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1998
- 1998-12-24 JP JP36691498A patent/JP3856274B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007132509A (en) * | 2005-10-12 | 2007-05-31 | Tok Bearing Co Ltd | Shock absorber using rotary damper |
| JP4575336B2 (en) * | 2005-10-12 | 2010-11-04 | トックベアリング株式会社 | Shock absorber using rotary damper |
| KR100863385B1 (en) * | 2006-03-06 | 2008-10-13 | 야마하 가부시키가이샤 | Musical instrument |
| JP2013019970A (en) * | 2011-07-07 | 2013-01-31 | Yamaha Corp | Lid body opening/closing structure of keyboard instrument |
| JP2013019969A (en) * | 2011-07-07 | 2013-01-31 | Yamaha Corp | Lid body opening/closing structure of keyboard instrument |
| US20150179151A1 (en) * | 2013-12-24 | 2015-06-25 | Casio Computer Co., Ltd. | Keyboard lid opening and closing apparatus and keyboard instrument |
| US9430993B2 (en) * | 2013-12-24 | 2016-08-30 | Casio Computer Co., Ltd. | Keyboard lid opening and closing apparatus and keyboard instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3856274B2 (en) | 2006-12-13 |
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