JPH0617190Y2 - Piano Accesion Jack - Google Patents
Piano Accesion JackInfo
- Publication number
- JPH0617190Y2 JPH0617190Y2 JP1987045919U JP4591987U JPH0617190Y2 JP H0617190 Y2 JPH0617190 Y2 JP H0617190Y2 JP 1987045919 U JP1987045919 U JP 1987045919U JP 4591987 U JP4591987 U JP 4591987U JP H0617190 Y2 JPH0617190 Y2 JP H0617190Y2
- Authority
- JP
- Japan
- Prior art keywords
- jack
- piano
- bearing portion
- columnar
- bearing
- 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 - Lifetime
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） この考案は、鍵の押圧力に対し敏感な反応を必要とする
ピアノアクションのジャックに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a piano action jack that requires a sensitive reaction to a key pressing force.
（従来の技術） 従来より、ピアノアクションのジャックは第３図示のよ
うにヘッド部２Ａ，柱状部２Ｂ，軸受部２Ｃ，テール部
２Ｄから構成する木製あるいは合成樹脂製のものであ
り、前記柱状部２Ｂにおける断面肉厚は第４図示のよう
に軸受部２Ｃをわずか盛り上げて厚くした後テール部２
Ｄからヘッド部２Ａまでは一定であった。(Prior Art) Conventionally, a piano action jack has been made of wood or synthetic resin and is composed of a head portion 2A, a columnar portion 2B, a bearing portion 2C, and a tail portion 2D as shown in FIG. The cross-sectional wall thickness at 2B is the tail portion 2 after the bearing portion 2C is slightly raised to be thick as shown in FIG.
It was constant from D to the head portion 2A.
（考案が解決しようとする問題点） 上述のピアノアクションのジャックは木製または合成樹
脂製であるが、合成樹脂製ジャックの場合、合成樹脂の
強度（Ｅ）は木材の1/3程度と考えられるため、木製ジ
ャックと同程度の強度を得ようとすれば、ジャック各部
の断面積をそれぞれに大きくする必要がある。(Problems to be solved by the invention) Although the above-mentioned piano action jack is made of wood or synthetic resin, in the case of synthetic resin jack, the strength (E) of synthetic resin is considered to be about 1/3 of that of wood. Therefore, in order to obtain the same strength as a wooden jack, it is necessary to increase the cross-sectional area of each part of the jack.
しかし、合成樹脂製ジャックの各部断面積を大きくすれ
ば、必然的に質量は増加するため慣性も大となり、鍵の
押圧力（タッチ）に対して敏感な反応を備えたピアノア
クションのジャックを得ることができないという欠点が
あった。そこで柱状部２Ｂの断面をＨ字形状に形成して
断面積を小さくしたものがあるが、テール部２Ｄの断面
に比し、極端に小さくなるため、成型時の引けによる変
形を生じる欠点があった。However, if the cross-sectional area of each part of the synthetic resin jack is increased, the mass will inevitably increase and the inertia will also increase, and a piano-action jack with a sensitive reaction to the key pressing force (touch) will be obtained. It had the drawback of not being able to. Therefore, there is one in which the cross-section area of the columnar portion 2B is formed in an H shape to reduce the cross-sectional area, but it is extremely smaller than the cross-section of the tail portion 2D, so there is a drawback that deformation due to shrinkage at the time of molding occurs. It was
（問題を解決するための手段） この考案は、上述のような欠点を解決するために、Ｌ字
形をなすジャック１の軸受部１Ｃに延設したテール部１
Ｄと直角方向に、軸受部１Ｃから先端に向かうに従い次
第に肉厚を薄くした柱状部１Ｂを垂設し、この柱状部１
Ｂの先端にヘッド部１Ａを一体に形成したことを特徴と
する。(Means for Solving the Problem) In order to solve the above-mentioned drawbacks, the present invention has a tail portion 1 extending from a bearing portion 1C of an L-shaped jack 1.
In the direction perpendicular to D, a columnar portion 1B having a thickness gradually reduced from the bearing portion 1C toward the tip is provided vertically.
The head portion 1A is integrally formed at the tip of B.
（実施例） 以下、図面を参照しこの考案の一実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの考案に係るピアノアクションのジャックの
斜視図であり、第２図は第１図におけるＡ−Ａ線断面図
である。FIG. 1 is a perspective view of a piano action jack according to the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.
この考案に係るピアノアクションのジャックは、第１図
示のように側面Ｌ字形をなすジャック１先端にヘッド部
１Ａを有する柱状部１Ｂを垂設し折曲部にに設けた軸受
部１Ｃと、この軸受部１Ｃ近傍より側方へ延設するテー
ル部１Ｄとから構成し、前記柱状部１Ｂの断面肉厚を第
２図示のように軸受部１Ｃからヘッド部１Ａへ向かって
漸次薄く薄くヘッド部１Ａと軸受部１Ｃ間を一体に接続
し、柱状部１Ｂの先端に肉厚の薄い平坦なヘッド部１Ａ
を形成すると共に柱状部１Ｂの両側には軸受部とヘッド
部との間に肉薄の縁部を設け、テール部１Ｄは軸受部１
Ｃと略同幅に合成樹脂で一体に成形したものである。な
お、この実施例では柱状部１Ｂの両側に縁部を設けた
が、上端のヘッド部の平坦性が得られれば必要ない。A piano action jack according to the present invention has a bearing portion 1C in which a columnar portion 1B having a head portion 1A is vertically provided at a tip of a jack 1 having an L-shaped side face as shown in a first illustration, and a bearing portion 1C is provided at a bent portion. And a tail portion 1D extending laterally from the vicinity of the bearing portion 1C. The sectional thickness of the columnar portion 1B is gradually thin and thin from the bearing portion 1C to the head portion 1A as shown in FIG. And the bearing portion 1C are integrally connected to each other, and a thin and flat head portion 1A is provided at the tip of the columnar portion 1B.
And a thin edge portion is provided between the bearing portion and the head portion on both sides of the columnar portion 1B, and the tail portion 1D has the bearing portion 1B.
It is integrally molded with a synthetic resin in the same width as C. Although the edge portions are provided on both sides of the columnar portion 1B in this embodiment, it is not necessary if the flatness of the head portion at the upper end can be obtained.
（考案の効果） 以上のように、この考案によれば、ピアノアクションジ
ャックの柱状部の断面肉厚を軸受部からヘッド部へ向か
って漸次薄くし、この柱状部においてヘッド部に近づく
程質量を小となるようにしたので、鍵の押圧力（タッ
チ）鍵に対して敏感に反応するピアノアクションのジャ
ックを得ることができる。(Effect of the Invention) As described above, according to the present invention, the sectional thickness of the columnar portion of the piano action jack is gradually reduced from the bearing portion toward the head portion, and the mass of the columnar portion becomes closer to the head portion. Since it is made small, it is possible to obtain a piano action jack that reacts sensitively to the key pressing force (touch) key.
第１図はこの考案の一実施例を示す斜視図、第２図は第
１図におけるＡ−Ａ線断面図、第３図は従来例を示す斜
視図、第４図は第３図におけるＢ−Ｂ線断面図である。 １…この考案に係るピアノアクションのジャック、 ２…従来のピアノアクションのジャック、 １Ａ，２Ａ…ヘッド部、 １Ｂ，２Ｂ…柱状部、 １Ｃ，２Ｃ…軸受部、 １Ｄ，２Ｄ…テール部。FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a perspective view showing a conventional example, and FIG. 4 is a B in FIG. It is a -B line sectional view. 1 ... Piano action jack according to the present invention, 2 ... Conventional piano action jack, 1A, 2A ... Head part, 1B, 2B ... Column part, 1C, 2C ... Bearing part, 1D, 2D ... Tail part.
Claims (1)
Ｃ）に延設したテール部（１Ｄ）と直角方向に、軸受部
（１Ｃ）から先端に向かうに従い次第に肉厚を薄くした
柱状部（１Ｂ）を垂設し、該柱状部（１Ｂ）の先端にヘ
ッド部（１Ａ）を一体に形成したことを特徴とするピア
ノアクションのジャック。1. A bearing portion (1) of an L-shaped jack (1).
In the direction perpendicular to the tail portion (1D) extending in C), a columnar portion (1B) having a wall thickness gradually reduced from the bearing portion (1C) toward the tip is vertically provided, and the tip end of the columnar portion (1B). A piano-action jack characterized in that the head portion (1A) is formed integrally with the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987045919U JPH0617190Y2 (en) | 1987-03-27 | 1987-03-27 | Piano Accesion Jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987045919U JPH0617190Y2 (en) | 1987-03-27 | 1987-03-27 | Piano Accesion Jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63153293U JPS63153293U (en) | 1988-10-07 |
| JPH0617190Y2 true JPH0617190Y2 (en) | 1994-05-02 |
Family
ID=30865098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987045919U Expired - Lifetime JPH0617190Y2 (en) | 1987-03-27 | 1987-03-27 | Piano Accesion Jack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617190Y2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS539315Y2 (en) * | 1972-04-05 | 1978-03-11 | ||
| JPS5019461U (en) * | 1973-06-15 | 1975-03-05 | ||
| JPS55128081U (en) * | 1979-03-02 | 1980-09-10 |
-
1987
- 1987-03-27 JP JP1987045919U patent/JPH0617190Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63153293U (en) | 1988-10-07 |
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