JPS6141117Y2 - - Google Patents
Info
- Publication number
- JPS6141117Y2 JPS6141117Y2 JP14639380U JP14639380U JPS6141117Y2 JP S6141117 Y2 JPS6141117 Y2 JP S6141117Y2 JP 14639380 U JP14639380 U JP 14639380U JP 14639380 U JP14639380 U JP 14639380U JP S6141117 Y2 JPS6141117 Y2 JP S6141117Y2
- Authority
- JP
- Japan
- Prior art keywords
- frame
- string
- elongated member
- hole
- view
- 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.)
- Expired
Links
- 238000005553 drilling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Rod-Shaped Construction Members (AREA)
Description
【考案の詳細な説明】
本考案は、梁と柱で形成されたフレームの一面
に弦を張設し、他面側から該フレームの窓を通し
て弦を打弦する式のいわゆる平型ピアノ又は電気
ピアノのフレームに関する。[Detailed description of the invention] The present invention is based on a so-called flat piano or electric Regarding the piano frame.
従来、この種のピアノのフレームは、第１図乃
至第４図に示すように、中高音側では、チユーニ
ングピンａを設けた梁ｂに対して空隙ｃをおいて
カポダストロバーｄが柱e1，e2間に架設され、低
音側では、該梁ｂ上にアグラフｆがねじ込まれて
植設されており、チユーニングピンａと弦係止用
ピンｇ間に張設された中高音側の弦ｈをカポダス
トロバーｄの下端で、低音側の弦ｈをアグラフｆ
の孔壁で、それぞれハンマーｉの打弦方向と反対
方向に向つて支持するのが一般である。 Conventionally, in the frame of this type of piano, as shown in Figs. 1 to 4, on the mid-to-treble side, a capodastro bar d is connected to a pillar e 1 with a gap c spaced from a beam b provided with a tuning pin a. , e 2 , and on the bass side, an agraph f is screwed and planted on the beam b, and on the mid-treble side stretched between the tuning pin a and the string locking pin g. Connect string h to the lower end of capodastrobar d, and connect the bass string h to agraph f.
Generally, the holes are supported in a direction opposite to the string-striking direction of the hammer i.
しかしこのフレームは、中高音側において、カ
ポダストロバーｄを梁ｂと並べて設けなければな
らないので、第１図におけるｙ方向の寸法を大き
くしなければならず、またカポダストロバーｄそ
のものも30cm〜40cmの長さを有し、その高さも50
〜60mmとかなり大きいから、フレームの重量が増
加するという欠点がある（グランドピアノでは、
カポダストロバーのみで10Kg前后の重量にな
る。）。また低音側の梁ｂ上に設けるアグラフｆ
は、第４図示のように、梁ｂに設けられ、平担に
削られた植込座ｊの螺孔ｋにネジ込まれて植設さ
れるので、孔明け、ネジ加工が各鍵毎に必要で加
工費が高くなると共に植込座ｊと他の部分の肉厚
のアンバランスから鋳造時のひけ巣、反り等の原
因となる欠点がある。また、アグラフｆを梁ｂに
ネジ込んだ時そのどちらかの面が弦の振動側に来
るのか予測がつかないので、アグラフのどちらの
面が弦の振動側に来ても音階音の正確な弦振動が
支承なく行なわれるようにするために弦の貫通孔
の両端を断面Ｖ形に形成するのが一般である。し
たがつて１度の孔明け加工が不可能であり、弦の
振動側とチユーニングピン側とから２度に亘る加
工が行なわれ、加工工数が多いという欠点があ
る。 However, in this frame, the capodastrobar d must be installed side by side with the beam b on the mid-treble side, so the dimension in the y direction in Figure 1 must be increased, and the capodastrobar d itself has a length of 30cm to 40cm. and its height is also 50
Since it is quite large at ~60 mm, it has the disadvantage of increasing the weight of the frame (for grand pianos,
The capodastro bar alone weighs about 10kg. ). Also, agraph f installed on beam b on the bass side.
As shown in Figure 4, the key is installed by being screwed into the screw hole k of the socket j, which is provided on the beam b and cut flat, so that the drilling and screw processing are done separately for each key. This has disadvantages in that it increases the processing cost and causes shrinkage cavities, warpage, etc. during casting due to an imbalance in the wall thickness between the implant seat j and other parts. Also, when Agraph f is screwed into beam B, it is impossible to predict which side of the Agraph will be on the string vibration side. In order to allow the string to vibrate without support, both ends of the string through-hole are generally formed to have a V-shaped cross section. Therefore, it is impossible to perform the hole drilling process once, and the process is performed twice from the vibrating side of the string and the tuning pin side, resulting in a large number of processing steps.
本考案は、このような欠点がない、軽量で且つ
加工が少なくすむピアノ等のフレームを提供する
ことをその目的とするものである。 The object of the present invention is to provide a frame for a piano or the like that is lightweight and requires less machining, without such drawbacks.
第１図示のフレームの高音部において、チユー
ニングピンａを設けた梁ｂの、弦ｈの張力による
変形ｙは、第５図のように、カポダストロバーｄ
の柱e1と柱e2との距離をｌ、弦ｈの総張力をｗ、
フレーム材料のヤング率をＥとすると、
ｙnax＝ｗｌ３／４８ＥＩ
但し、Ｉは断面２次モーメント、
であり、ｗ，ｌ，Ｅ一定とすると、ｙnax∝
１／Ｉである。 In the treble part of the frame shown in Figure 1, the deformation y of the beam b provided with the tuning pin a due to the tension of the string h is as shown in Figure 5.
The distance between pillar e 1 and pillar e 2 is l, the total tension of string h is w,
If the Young's modulus of the frame material is E, then y nax = wl 3 /48EI, where I is the second moment of area, and if w, l, and E are constant, then y nax ∝
It is 1/I.
断面２次モーメントＩは梁ｂの幅をy1、厚みを
z1とするとＩ＝１／２z1 3・y1であるから、梁ｂの変形
を小さくするには梁ｂの厚みz1を大きくするのが
効果的である。 The second moment of area I is defined by the width of beam b being y 1 and the thickness being
When z 1 , I=1/2z 1 3 ·y 1 , so it is effective to increase the thickness z 1 of beam b in order to reduce the deformation of beam b.
以上のように梁ｂの機械的強度を考察すると
き、カポダストロバーｄは、梁ｂの一部として作
用せず、単に弦ｈの上下方向の力を支えているに
すぎないことが判つた。 When considering the mechanical strength of the beam b as described above, it was found that the capodastro bar d does not act as a part of the beam b, but merely supports the vertical force of the string h.
そこで、本考案は、重量を増加させるカポダス
トロバー及び加工工数を増加させるアグラフを廃
し、チユーニングピン６を設けた前記フレーム３
の梁１の上面に長尺部材８を埋設して突設させ、
該長尺部材８にはその後方部に長手横方向に沿つ
て連続したＶ型溝９を設けると共に、該Ｖ型溝９
内に前方に向けて貫通孔７を設けて、該貫通孔７
に前記弦４を挿通させたことを特徴とする。 Therefore, the present invention eliminates the capodustrobar that increases the weight and the agraph that increases the number of processing steps, and eliminates the above-mentioned frame 3 provided with the tuning pin 6.
A long member 8 is buried and protruded in the upper surface of the beam 1,
The elongated member 8 is provided with a continuous V-shaped groove 9 along the longitudinal and lateral direction in its rear part, and the V-shaped groove 9
A through hole 7 is provided inside toward the front, and the through hole 7
The string 4 is inserted through the string 4.
以下、本考案の実施例を図面につき説明する。
第６図のフレーム３では、長尺部材８は低音部、
中音部及び高音部の３個を設け、それぞれをフレ
ーム３の鋳造時に該フレーム３のチユーニングピ
ン６を設ける梁１にインサート成型する（第７
図）。該長尺部材８は、先ず、第８図に示すよう
に、長手横方向のＶ型溝９及びインサート成型時
に長尺部材８とフレーム３との結合を強固にする
溝１０を有する部材８′を引抜き形成し、次い
で、この部材８′に第９図Ａ，Ｂに示すように、
溝９のある面と反対面に、縦方向の溝１１を、弦
４の配置間隔毎に切削することによつて形成す
る。７は溝９，１１を設けることによつて形成さ
れた弦４の貫通孔である。部材８の材料は軟鋼、
真鍮等引抜き性、切削性のよい材料が用いられ
る。第１０図Ａ，Ｂは第９図の長尺部材８の変形
例で、水平方向のＶ型溝９に対して該溝９の形成
面の反対側から弦４の間隔に対応して皿孔１２が
明けられ弦４の貫通孔７が形成されたものであ
る。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the frame 3 of FIG. 6, the elongated member 8 includes a bass section,
Three parts, a mid-range part and a treble part, are provided, and each is insert-molded into the beam 1 on which the tuning pin 6 of the frame 3 is provided when the frame 3 is cast.
figure). As shown in FIG. 8, the elongated member 8 is first formed into a member 8' having a V-shaped groove 9 in the longitudinal and lateral directions and a groove 10 for strengthening the connection between the elongated member 8 and the frame 3 during insert molding. The member 8' is then formed by drawing, as shown in FIGS. 9A and 9B.
A vertical groove 11 is formed on the surface opposite to the surface where the groove 9 is provided by cutting it at each arrangement interval of the strings 4. Reference numeral 7 denotes a through hole for the string 4 formed by providing grooves 9 and 11. The material of member 8 is mild steel.
Materials with good drawing and cutting properties, such as brass, are used. 10A and 10B show modified examples of the elongated member 8 in FIG. 9, in which countersink holes are formed from the side opposite to the surface where the groove 9 is formed, corresponding to the interval between the strings 4, with respect to the horizontal V-shaped groove 9. 12 is opened and a through hole 7 for the string 4 is formed.
第１１図は弦４を支持する突起１３を有する溝
９を引抜きにより形成した長尺部材８、第１２図
は弦４を支持する突起１３を有する片持梁状の長
尺部材８を示し、いずれも貫通孔７ではなく突起
１３で弦４を支持する長尺部材８の例である。第
１２図の長尺部材８は高音用に適するもので、弦
４の支持点を梁１の端部から突出させることがで
きるので、ハンマー１４は支持近傍の弦４を打弦
することができる。 FIG. 11 shows a long member 8 in which a groove 9 having a protrusion 13 for supporting a string 4 is formed by drawing, and FIG. 12 shows a cantilever-shaped elongate member 8 having a protrusion 13 for supporting a string 4. All of these are examples of elongated members 8 that support strings 4 with protrusions 13 instead of through holes 7. The elongated member 8 in FIG. 12 is suitable for high-pitched notes, and the support point of the string 4 can be made to protrude from the end of the beam 1, so the hammer 14 can strike the string 4 near the support. .
尚、前記実施例では、長尺部材８は梁１にイン
サート成型により固着したが、長尺部材８の下端
に鍔を設ける等によりボルト等で梁１に固定して
もよい。 In the above embodiment, the elongated member 8 was fixed to the beam 1 by insert molding, but it may be fixed to the beam 1 with bolts or the like by providing a collar at the lower end of the elongated member 8.
このように本考案によるときは、平型ピアノに
おいて、チユーニングピンを植設したフレームの
梁に、低音部から高音部までの弦の貫通孔を有す
る、少なくとも１個の長尺部材を設けたので、従
来のカポダストロバーやアグラフが設けられたピ
アノ等のフレームに比べて軽量で且つ加工工数の
少ないものが得られる効果を有する。 As described above, according to the present invention, in a flat piano, at least one elongated member having a through hole for the strings from the bass part to the treble part is provided on the beam of the frame in which the tuning pin is installed. Therefore, compared to the frame of a piano or the like provided with a conventional capodastro bar or agraph, it is possible to obtain a frame that is lighter and requires fewer processing steps.
また、長尺部材８にはその後方部（弦４の振動
側）に長手横方向に沿つて連続したＶ型溝９を設
けると共に、該Ｖ型溝９内に前方（チユーニング
ピン６側）に向けて弦４を挿通させるための貫通
孔７を設けたので、貫通孔７の孔明け加工は前方
部からだけすればよく、従来のものに比して孔明
け加工の工数が少なくなる効果を有する。 Further, the elongated member 8 is provided with a continuous V-shaped groove 9 along the longitudinal and lateral direction in its rear part (on the vibration side of the string 4), and a V-shaped groove 9 is provided in the V-shaped groove 9 in the front part (on the tuning pin 6 side). Since the through-hole 7 for inserting the string 4 is provided toward the front, the through-hole 7 only needs to be drilled from the front, which has the effect of reducing the number of man-hours required for drilling compared to conventional ones. has.
第１図乃至第４図は従来のピアノ等のフレーム
を示し、第１図は平面図、第２図は中高音側の截
断面図、第３図は低音部の截断面図及び第４図は
低音部のアグラフ部分の分解斜視図、第５図はそ
の梁の作用説明図、第６図は本考案のフレームの
一例の一部平面図、第７図はその一部截断面図、
第８図はその長尺部材の成形途中の斜視図、第９
図Ａは長尺部材の一例の斜視図、第９図Ｂはその
側面図、第１０図Ａは長尺部材の他の例の斜視
図、第１０図Ｂはその側面図、第１１図は長尺部
材の第３の例の側面図、第１２図は高音用に適し
た長尺部材を用いた本考案のフレームの他の例の
一部截断側面図である。
１……梁、２……柱、３……フレーム、４……
弦、５……窓、６……チユーニングピン、７……
貫通孔、８……長尺部材、９……Ｖ型溝。
Figures 1 to 4 show frames of conventional pianos, etc., where Figure 1 is a plan view, Figure 2 is a cross-sectional view of the middle and high notes, Figure 3 is a cross-sectional view of the bass part, and Figure 4 is a cross-sectional view of the bass side. is an exploded perspective view of the agraph part of the bass part, FIG. 5 is an explanatory diagram of the action of the beam, FIG. 6 is a partial plan view of an example of the frame of the present invention, and FIG. 7 is a partially cutaway view thereof.
Fig. 8 is a perspective view of the elongated member in the middle of forming, Fig. 9
Figure A is a perspective view of an example of the elongated member, Figure 9B is a side view thereof, Figure 10A is a perspective view of another example of the elongated member, Figure 10B is a side view thereof, and Figure 11 is A side view of a third example of the elongated member, and FIG. 12 is a partially cutaway side view of another example of the frame of the present invention using the elongated member suitable for high-pitched sounds. 1...Beam, 2...Column, 3...Frame, 4...
String, 5... Window, 6... Tuning pin, 7...
Through hole, 8... Long member, 9... V-shaped groove.
Claims (1)
弦４を張設し、下面側から該梁１及び柱２で形成
された窓５を通して前記弦４を打弦する式のピア
ノ等において、チユーニングピン６を設けた前記
フレーム３の梁１の上面に長尺部材８を埋設して
突設させ、該長尺部材８にはその後方部に長手横
方向に沿つて連続したＶ型溝９を設けると共に、
該Ｖ型溝９内に前方に向けて貫通孔７を設けて、
該貫通孔７に前記弦４を挿通させたことを特徴と
するピアノ等のフレーム。 In a type of piano or the like in which strings 4 are stretched over the upper surface of a frame 3 formed by a beam 1 and columns 2, and the strings 4 are struck from the lower surface side through a window 5 formed by the beams 1 and columns 2, An elongated member 8 is embedded and protrudes from the upper surface of the beam 1 of the frame 3 provided with the tuning pin 6, and the elongated member 8 has a continuous V-shaped groove along the longitudinal and lateral direction in its rear part. 9, and
A through hole 7 is provided in the V-shaped groove 9 toward the front,
A frame for a piano or the like, characterized in that the string 4 is inserted through the through hole 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14639380U JPS6141117Y2 (en) | 1980-10-16 | 1980-10-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14639380U JPS6141117Y2 (en) | 1980-10-16 | 1980-10-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5770289U JPS5770289U (en) | 1982-04-27 |
| JPS6141117Y2 true JPS6141117Y2 (en) | 1986-11-22 |
Family
ID=29505963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14639380U Expired JPS6141117Y2 (en) | 1980-10-16 | 1980-10-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6141117Y2 (en) |
-
1980
- 1980-10-16 JP JP14639380U patent/JPS6141117Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5770289U (en) | 1982-04-27 |
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