JP7588291B2 - An article that improves the retention of the base part of a flexible tube - Google Patents
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- JP7588291B2 JP7588291B2 JP2021163117A JP2021163117A JP7588291B2 JP 7588291 B2 JP7588291 B2 JP 7588291B2 JP 2021163117 A JP2021163117 A JP 2021163117A JP 2021163117 A JP2021163117 A JP 2021163117A JP 7588291 B2 JP7588291 B2 JP 7588291B2
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- 230000014759 maintenance of location Effects 0.000 title description 9
- 238000005488 sandblasting Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 18
- 230000003746 surface roughness Effects 0.000 claims description 13
- 230000007423 decrease Effects 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 2
- 238000010297 mechanical methods and process Methods 0.000 claims 2
- 230000005226 mechanical processes and functions Effects 0.000 claims 2
- 238000007788 roughening Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 description 21
- 239000012779 reinforcing material Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 239000000843 powder Substances 0.000 description 4
- 238000005422 blasting Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- Rigid Pipes And Flexible Pipes (AREA)
Description
本発明は金属屈曲管フレキシブルチューブの根元部分の保持力を高めることに関する。The present invention relates to increasing the retention force of the root portion of a metal bent flexible tube.
従来、金属屈曲管フレキシブルチューブは先端部に灯具又は音響機器等を搭載してこれを保持する機構を有しているが、使用上フレキシブルチューブの根元部分に応力が集中しやすくこの部分の屈曲保持力の補強が課題であった。［図１］これまでの解決方法としては、
フレキシブルチューブの外径を太くしたもので解決する方法
フレキシブルチューブの根元内部に補強材を装着する方法
フレキシブルチューブの根元外周部に熱収縮チューブ他補強材を被覆する方法
根元部は太いフレキシブルチューブで中継金具を介して先端部は細いフレキシブルチューブに接続する方法
等の方法で対処している。Conventionally, metal bent flexible tubes have a mechanism for mounting and holding lighting or audio equipment at the tip, but stress tends to concentrate at the base of the flexible tube during use, and reinforcing the bending holding force of this part has been an issue. [Figure 1] Previous solutions have included:
This problem has been solved by using a flexible tube with a thicker outer diameter, by attaching reinforcing material to the inside of the base of the flexible tube, by covering the outer periphery of the base of the flexible tube with heat shrink tubing or other reinforcing material, and by connecting the base part to a thick flexible tube and the tip part to a thin flexible tube via an intermediate fitting.
フレキシブルチューブの根元部分の強化の為に外径を太くしたフレキシブルチューブで対応すると根元部分の強化は得られるが同時にフレキシブルチューブ全体の保持力が高まってしまう為しなやかでスムーズな動きを求められるフレキシブルチューブの先端部分の屈曲の簡易操作性を低下させてしまう課題があった。［図２］
これを解決するために、フレキシブルチューブの内部の根元部分により線等の補強材を装着する方法［図３］があるが、フレキシブルチューブ内部の電気配線が困難になる問題があり用途が限定されている。また別の方法として、フレキシブルチューブの根元部分に熱収縮チューブ等の補強材を被覆させて根元部の保持力を向上する方法［図４］があるが、フレキシブルチューブの外観上の問題、補強材の追加による重量増加の問題があった。
これとは別に根元部分は太いフレキシブルチューブで中継金具を介して先端部は細いフレキシブルチューブに接続してフレキシブルチューブの根元部と先端部で保持力の差を実現する解決策も従来採用されてきた方法であるが、２重構造となる事による製造上の組立性の煩雑化と部品点数の増加がありコストアップが問題となっていた。［図５］
またいずれの方法でも補強されている部分とそれ以外の部分では極端な屈曲特性の差があり、根元部分の保持力の補強は実現できてもフレキシブルチューブ全体としてのしなやかでスムーズな屈曲特性を満たせない問題があった。If a flexible tube with a thicker outer diameter is used to strengthen the base of the flexible tube, the base can be strengthened, but at the same time, the holding power of the entire flexible tube increases, which reduces the ease of bending the tip of the flexible tube, which is required to move flexibly and smoothly. [Figure 2]
To solve this problem, there is a method of attaching a reinforcing material such as a wire to the inside of the base of the flexible tube [Fig. 3], but this method has the problem of making it difficult to install electrical wiring inside the flexible tube, and its applications are limited. Another method is to cover the base of the flexible tube with a reinforcing material such as a heat shrink tube to improve the holding power of the base [Fig. 4], but this has problems with the appearance of the flexible tube and the weight increase due to the addition of the reinforcing material.
Another solution that has been adopted in the past is to connect the base of a thick flexible tube to a thin flexible tube via a relay metal fitting at the tip, thereby achieving a difference in holding power between the base and tip of the flexible tube. However, this double structure makes assembly more complicated and increases the number of parts, which causes problems with costs. [Figure 5]
Furthermore, with either method, there was an extreme difference in bending characteristics between the reinforced section and the other sections, and while it was possible to reinforce the holding power of the base section, there was a problem in that it was not possible to achieve flexible and smooth bending characteristics for the flexible tube as a whole.
フレキシブルチューブについては［図６］に示すように下巻線の密着コイルバネのスプリング材の表面と上巻線である三角線等との摩擦力によって屈曲形状が保持される機構となっている。このフレキシブルチューブの表面摩擦力とフレキシブルチューブの屈曲保持力の関係に着目した保持力アップの方法である。
従来金属部品にサンドブラスト処理を行うことは、メッキ外観を梨地調に仕上げる表面処理の方法として、もしくは金属表面のサビ、その他付着物の除去を目的とするクリーニング方法として用いられている。
そこでサンドブラストによる外観仕上げ、クリーニングの処理に伴って表面の面粗度が荒くなることを利用してフレキシブルチューブの根元部分に局所的にサンドブラストを行い、フレキシブルチューブの屈曲に伴う表面摩擦力を当該部分のみ高めて当該箇所のフレキシブルチューブの屈曲保持力向上を解決し、サンドブラストの影響が及ばないフレキシブルチューブ先端部分とその周辺は従来屈曲特性を維持して根元部と先端部で保持力の異なるフレキシブルチューブの製法を実現する。［図７］As shown in Figure 6, the flexible tube has a mechanism for holding the bent shape by friction between the surface of the spring material of the lower winding of the tight coil spring and the upper winding of the triangular wire, etc. This is a method for increasing the holding force by focusing on the relationship between the surface friction force of the flexible tube and the bending holding force of the flexible tube.
Conventionally, sandblasting of metal parts has been used as a surface treatment method for giving a matte finish to the plating appearance, or as a cleaning method for removing rust and other deposits from the metal surface.
Therefore, by utilizing the fact that the surface roughness becomes rough due to the appearance finishing and cleaning process by sandblasting, sandblasting is performed locally on the base part of the flexible tube, and the surface friction force caused by bending the flexible tube is increased only in that part, thereby solving the problem of improving the bending retention of the flexible tube in that part, while the tip part of the flexible tube and its surroundings, which are not affected by sandblasting, maintain the conventional bending characteristics, thereby realizing a manufacturing method for a flexible tube with different retention strength at the base and tip [Figure 7].
根元部分を局所的にサンドブラストするだけでも当該箇所とその周辺部ではサンドブラストのブラスト圧力が中心から周辺部にゆくに従って徐々に弱くなりこれに伴ってサンドブラストによる面粗度の粗さも根元部分から先端部分にゆくに従って小さくなり、フレキシブルチューブの屈曲保持力特性も根元部分から先端部分にかけて徐々に低下するスムーズな屈曲特性を有するが、さらに根元部分から先端部分にゆくに従ってサンドブラストの条件を変えて根元部分から先端部分にゆくに伴いフレキシブルチューブの表面の面粗度を徐々に小さくしてゆくことによってフレキシブルチューブの屈曲に伴う表面摩擦力が徐変されることと相関してフレキシブルチューブの屈曲保持力が根元部から先端部にかけて徐々に小さくなることによるしなやかでより一層スムーズな屈曲特性を実現するとともにサンドブラストの影響が及ばない先端部分及びその周辺部の屈曲特性は素材本来の剛性によるの容易な屈曲特性を維持する。
このサンドブラストの条件を根元部分から徐々に変更させる方法としては、エアーサンドブラストのエアーガンとフレキシブルチューブの距離を根元部分から先端部分に向かうにしたがって徐々に大きくしてサンドブラストの処理の影響を根元部分から先端部分にゆくに従って徐々に小さくしてゆく方法［図８］や、サンドブラストに使うブラスト粉（メディア）を根元部分と、これに近接する部分とで変更して数回に分けてサンドブラスト処理することにより同様の効果を得る方法［図９］
等がある。Even if the base portion is simply sandblasted locally, the blast pressure at that point and its surrounding areas will gradually weaken from the center to the periphery, and as a result, the surface roughness due to the sandblasting will also decrease as you move from the base to the tip, and the bending retention strength of the flexible tube will gradually decrease from the base to the tip, resulting in smooth bending characteristics.However, by changing the sandblasting conditions as you move from the base to the tip, the surface roughness of the flexible tube will gradually decrease as you move from the base to the tip, and this will correlate with the gradual change in the surface friction force associated with bending the flexible tube, so that the bending retention strength of the flexible tube will gradually decrease from the base to the tip, resulting in a supple and even smoother bending characteristic, and the bending characteristics of the tip portion and its surrounding areas which are not affected by sandblasting will maintain the easy bending characteristics due to the inherent rigidity of the material.
Methods for gradually changing the sandblasting conditions from the base include gradually increasing the distance between the air gun and the flexible tube from the base to the tip, so that the effect of the sandblasting process gradually decreases from the base to the tip [Fig. 8], and a similar effect can be achieved by changing the blasting powder (media) used for the base and the adjacent parts and performing the sandblasting process in several steps [Fig. 9].
etc.
従来技術のフレキシブルチューブの根元内部に補強材の装着、外部の補強素材の被覆等の方法ではなく、フレキシブルチューブの表面の面粗度を根元部と先端部で変化させるので、フレキシブルチューブの内部の配線構造への影響はない。併せて補強材等の装着がないので、近年全ての工業製品に求められる軽量化の追求に鑑みても課題解決に伴って製品の重量増加はないことと、元来のフレキブルチューブの外観を損ねない解決方法を実現する。Unlike the conventional method of attaching a reinforcing material inside the base of the flexible tube or covering the outside with a reinforcing material, this method changes the surface roughness of the flexible tube between the base and tip, so there is no effect on the wiring structure inside the flexible tube. In addition, since no reinforcing material is attached, there is no increase in product weight in line with the problem-solving, even in light of the pursuit of weight reduction required for all industrial products in recent years, and this realizes a solution that does not damage the appearance of the original flexible tube.
図６はブラスト処理されたフレキシブルチューブを示す。フレキシブル根元部チューブの根元部分を中心にサンドブラストされたフレキシブルチューブはサンドブラスト処理の影響を強く受ける根元部分の表面が荒く、これによりフレキシブルチューブ屈曲時の表面摩擦力が根元部分は高く、且つ根元部分から先端部に行くにしたがってサンドブラストの影響が小さくなりこれに伴ってフレキシブルチューブの屈曲時の表面摩擦力が根元部分に対して小さくなってゆく。この屈曲時の表面摩擦力の差によりフレキシブルチューブの屈曲時の保持力が根元部分では高く、先端部にゆくにしたがって徐々に素材本来の剛性による屈曲保持力になる根元部分の屈曲保持力を大きくしたフレキシブルチューブで且つ先端部分は従来の屈曲簡易操作性を維持した物品となる。Fig. 6 shows a blasted flexible tube. The flexible tube is sandblasted mainly at the base of the flexible tube, and the surface of the base is rough, which is strongly affected by the sandblasting process. As a result, the surface friction force of the flexible tube is high at the base when it is bent, and the effect of sandblasting decreases from the base to the tip, and accordingly the surface friction force of the flexible tube when it is bent becomes smaller than that of the base. Due to this difference in surface friction force when it is bent, the holding force of the flexible tube when it is bent is high at the base, and gradually becomes the holding force due to the inherent rigidity of the material as it approaches the tip, resulting in a flexible tube with a high holding force at the base, while the tip maintains the conventional easy bending operability.
図７ないし図８は本発明に係るサンドブラスト加工の処理例を示す。
図７はサンドブラスト処理におけるエアー圧力、ブラスト粉の種類及び量等の条件は一定の状態でフレキシブルチューブとサンドブラストのエアーガンとの距離をフレキシブルチューブの根元部分から先端部分に向かうにしたがって大きくして意図的に徐々にサンドブラストの影響をフレキシブルチューブの根元部分から先端部分にかけて徐々に小さくして行くサンドブラストの加工例である。
これによりフレキシブルチューブ表面の面粗度及び屈曲の表面摩擦力が、根元部から先端部に向かうにしたがって徐々に低下し、これに伴って、根元部分から先端部にかけて変化して行く屈曲保持力がより一層スムーズになるフレキシブルチューブである。
図８はサンドブラスト加工において、フレキシブルチューブとサンドブラストのエアーガンの距離は一定で他の条件（エアー圧、ブラスト粉等）の条件を変えて数回に分けて根元部から先端部に向けてサンドブラスト処理を行って、根元部分から先端部分にかけて徐々に小さくして行くサンドブラストの加工例である。これによりフレキシブルチューブ表面の面粗度及び屈曲の表面摩擦力が、根元部から先端部に向かうにしたがって徐々に低下し、これに伴って、根元部分から先端部にかけて変化して行く屈曲保持力がより一層スムーズになるフレキシブルチューブである。7 and 8 show an example of the sandblasting process according to the present invention.
Figure 7 shows an example of sandblasting processing in which the conditions of the sandblasting process, such as the air pressure, type and amount of blast powder, etc., are kept constant, and the distance between the flexible tube and the sandblasting air gun is increased from the base of the flexible tube to the tip, intentionally gradually decreasing the effect of sandblasting from the base to the tip of the flexible tube.
As a result, the surface roughness of the flexible tube and the surface friction force of bending gradually decrease from the base to the tip, and accordingly, the bending retention force changes more smoothly from the base to the tip.
Figure 8 shows an example of sandblasting where the distance between the flexible tube and the sandblasting air gun is constant, but other conditions (air pressure, blasting powder, etc.) are changed and sandblasting is performed in several steps from the base to the tip, gradually decreasing the friction from the base to the tip. This results in a flexible tube where the surface roughness of the flexible tube and the surface friction of bending gradually decrease from the base to the tip, and the bending retention force that changes from the base to the tip becomes even smoother.
１フレキシブルチューブ
２灯具その他
３台座部
４太いフレキシブルチューブ
５補強材
６熱収縮チューブ等の補強材被覆
７中継金具
８サンドブラスト処理部
９エアーガン位置
１０下巻線
１１上巻線1
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050092875A1 (en) | 2003-10-31 | 2005-05-05 | Carnevali Jeffrey D. | Flexible support arm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050092875A1 (en) | 2003-10-31 | 2005-05-05 | Carnevali Jeffrey D. | Flexible support arm |
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