JPS5872789A - Cylindrical article which is made of synthetic resin and has bellow section - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 成樹脂筒状物、特にその一部に蛇腹部を有し長さ調節な
らびに屈曲が可能な前記筒状物に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin cylindrical object, and particularly to a cylindrical object having a bellows part in a part thereof and whose length can be adjusted and bent.

現在、洗濯機のホース，飲用ストロ−を始めとして三次
元方向への屈曲を自在ならしめ、あるいは伸縮可能とし
て使用時における取扱いを便ならしめるべく一部に蛇腹
部分を設けた合成樹脂製筒状製品は広く用いられている
。なかでも洗濯機のホース継手部分などにおいては少く
とも３ケ所の蛇腹部分を設けることにより屈曲性．伸縮
性を活用して配管を著しく容易ならしめている。このこ
とは、今後、更にその要求は昂まり、例えば薬剤粉末の
収納などにあっても、予め、縮少させ、この状態で薬剤
粉末を収納し、飲用時、あるいは使用時に引き伸ばして
水を入れたり、使用するなどにより運賃コストの低減を
もたらす等の分野にその利用が考慮されている。Currently, products such as washing machine hoses and drinking straws are made of synthetic resin cylinders that can be freely bent in three dimensions or expanded and contracted to make them easier to handle during use. The product is widely used. In particular, the hose joints of washing machines have at least three bellows parts to improve flexibility. The elasticity makes piping much easier. The demand for this will continue to increase in the future. For example, when storing pharmaceutical powder, it is necessary to shrink the pharmaceutical powder in advance, store it in this state, stretch it out, and add water when drinking or using it. Its use is being considered in fields such as bringing about reductions in freight costs by using it.

従来、かかる一部に蛇腹部を有する合成樹脂筒２− 状物は通常、押出し成形にょｎ成形し冷却した後、２次
加工の段階″Ｔ：螺旋切りなどの手段によってくせ付け
することにより作成されていた。Conventionally, such a synthetic resin cylinder 2-shaped article having a bellows part is usually produced by extrusion molding, cooling, and then shaping by means such as spiral cutting in the secondary processing step. It had been.

ところが、かかる製造方法では、成形時におけるピンホ
ールの発生を避けることができず、ブロー成形による成
形が次第に普及されて来た。However, with this manufacturing method, the occurrence of pinholes during molding cannot be avoided, and molding by blow molding has gradually become popular.

ブロー成形によるものはその製法上、ピンホールの検査
は必要でなく、従って従来法に比べて遥かに品質の改善
をもたらしているが、現在、作成されている蛇腹部分付
き筒状物の蛇腹部は、その襞山の形状が伸張時、二等辺
三角形断面を形成するように、筒状動軸線上への投影長
式は山形突起の頂角を挾む２辺において同じ長さに作ら
れている〇 一般に蛇腹部分による長さ調節はその蛇腹部分の伸張に
よるが、その伸張が余り簡単に行なえる場合は筒状物が
可撓弾撥性に欠けるため好ましいものではなく、一方、
伸張に相当の力を必要とするのも問題である。Blow molding does not require inspection for pinholes due to its manufacturing method, and therefore has much improved quality compared to conventional methods. is made so that the shape of the folds forms an isosceles triangular cross section when extended, so that the projection length formula onto the cylindrical motion axis is made to have the same length on the two sides that sandwich the apex angle of the chevron. 〇 Generally, the length adjustment by the bellows part is done by stretching the bellows part, but if this stretching can be done too easily, it is not preferable because the cylindrical object lacks elasticity.On the other hand,
Another problem is that a considerable amount of force is required for expansion.

そこで使用する合成樹脂材料の性質に影響され一３＝ るところが大きく、従来一般にホース月４４などとして
使用されているポリエチレンなどの樹脂ではこれを和ら
げるためには反撥力のある樹脂の使用が望まれている。This is greatly influenced by the properties of the synthetic resin material used, and in order to alleviate this effect, it is desirable to use a resin with repulsive force, such as polyethylene, which has been conventionally used for materials such as hoses. ing.

しかし、このように反撥力のある樹脂を用い、ポリエチ
レン樹脂などで蛇腹部分を有する筒状物を成形しても、
前述の如く、突起頂角を挾む２辺の長さが同じ場合には
その引張時における応力の方向が相平衡して何ら有効に
作用せず、従って伸張にはやはり相当の力が要求され、
伸張、縮少。However, even if a repulsive resin is used to mold a cylindrical object with a bellows part from polyethylene resin, etc.,
As mentioned above, if the lengths of the two sides sandwiching the apex angle of the protrusion are the same, the direction of the stress during tension will be in equilibrium and will not act effectively, so a considerable force will still be required for extension. ,
Expansion, contraction.

あるいは異方向への屈曲を繰り返すことによって損傷の
発生を免れなかった。Otherwise, damage could not be avoided due to repeated bending in different directions.

本発明は、かかる事実に即応し、その欠陥を除去すべく
前記蛇腹部における襞の役割について鋭意検討を行ない
、その結果、襞を二等辺三角形断面ではなく不等三角形
断面とすることにより応力の利用が可能となＶ、かつ頂
部にヒンヂ性ならびに配回に対する力をもたせ伸張容易
な筒状成形物を得ることを知見するに至った。The present invention has been developed in response to such a fact, and in order to eliminate this defect, the role of the folds in the bellows section has been carefully studied.As a result, the stress is reduced by making the folds have an unequal triangular cross section instead of an isosceles triangular cross section. It has been discovered that it is possible to obtain a cylindrical molded product that has a V that can be used, has hinge properties at the top and has strength for rotation, and is easily expandable.

即ち、本発明の特徴とするところは、前記蛇腹４一 部における襞の山形突起頂角を挾む２つの面の筒状成形
物中心軸線上への投影長さを異ならしめ長短不同となす
と共に、短面側の前記突起部頂端や内方寄りに屈曲頂端
が前記突起部頂端より筒状成形物軸線への垂直平面上、
若しくはそれより少ぐとも長面側寄りに位置する断面く
字状又は逆く字状の屈曲部を形成した点にある。That is, the present invention is characterized in that the projection lengths of the two surfaces sandwiching the apex angles of the folds in a portion of the bellows 4 on the central axis of the cylindrical molded product are made different, and the lengths are unequal. , the top end of the protrusion on the short side or the inwardly bent top end is on a plane perpendicular to the axis of the cylindrical molded product from the top end of the protrusion,
Alternatively, a bent portion having a doglegged or inverted doglegged cross section is formed at least slightly closer to the long side.

以下、更に上記本発明の具体的な態様について添付図面
にもとづいて説明する。Hereinafter, specific embodiments of the present invention will be further explained based on the accompanying drawings.

第１図は本発明に係る合成樹脂製筒状物の１例を示し、
第２図、第３図はその一部拡大図である。FIG. 1 shows an example of a synthetic resin cylindrical article according to the present invention,
FIGS. 2 and 3 are partially enlarged views.

これら図において、（１）は筒状物、（２）は一部に形
成された蛇腹部を示しており、これらは通常合成樹脂の
ブロー成形によって一挙に型により成形されたものであ
る。In these figures, (1) shows a cylindrical object, and (2) shows a partially formed bellows part, which are usually molded all at once by blow molding of synthetic resin.

蛇腹部（２）は通常、その利用目的によって適宜数が選
定され、１〜複数個成形されるが、筒状成形物の径も多
種多様であり、蛇腹部（２］の個数、襞数も何ら制限さ
れるものではない。Normally, the number of bellows parts (2) is selected appropriately depending on the purpose of use, and one or more pieces are molded. However, the diameter of the cylindrical molded product varies widely, and the number of bellows parts (2) and the number of folds also vary. There are no restrictions whatsoever.

第２図、第３図は、上記構成における蛇腹部（２）５− を拡大して示したものであり、本発明の特徴を明らかに
している。FIGS. 2 and 3 are enlarged views of the bellows portion (2) 5- in the above configuration, and clarify the features of the present invention.

即ち、第３図の説明図に示すように本発明にあっては、
蛇腹部（２）を構成する各襞の山形突起部（３）の頂角
を挾む２つの面（Ｓｌ）、（Ｓ２）の筒状成形物（１）
の中心軸線への投影長さＣ１，）、　＜ｉ２＞　が異な
り、襞の谷を通り筒状成形物（１）の軸線に垂直な面に
対し不等間隔に形成されてお９、図においてばｔｌ＞　
ｔ２　トなっている。That is, as shown in the explanatory diagram of FIG. 3, in the present invention,
A cylindrical molded product (1) with two surfaces (Sl) and (S2) sandwiching the apex angle of the chevron-shaped protrusion (3) of each fold constituting the bellows part (2).
The projected lengths C1, ) and <i2> of Buttl>
t2 It's gone.

この場合、ｔ、とｔ２　　との割合に、特に制限はない
が好ましい率はｔ、をｌとすれば４＝Ｖ４〜％であり、
最も好ましりＦＸ、％である。In this case, there is no particular limit to the ratio of t and t2, but the preferred ratio is 4=V4~%, where t is l,
Most preferred is FX, %.

そして、更に、前配襞部の山形突起部（３）の頂端（４
）においては、その稍短面（Ｓ２）側に偏して屈曲部（
５）が形成されており、この屈曲部（５）の屈曲頂端は
前記突起部（３）の頂端（４）より筒状成形物（１１の
中心軸線への垂直平面上か、若しくはそれより長辺側に
入って腋部に断面く字状又は逆く字状の屈曲部（５）を
作っている。Furthermore, the top end (4) of the chevron-shaped protrusion (3) of the front fold part
), the bent portion (
5) is formed, and the bent top end of this bent part (5) is on a plane perpendicular to the central axis of the cylindrical molded part (11) or longer than the top end (4) of the projection part (3). It enters the side and forms a bent part (5) with a doglegged or inverted doglegged cross section in the armpit.

なお、前記屈曲部（５）頂端の筒状成形物径方向の６− 位置は、余り中心軸線帯りになっては所期の伸張屈曲操
作に充分でなく、山形突起部（３）の頂端を連ねる外径
と、谷部を連ねる内径との間の頂端側よりｙ　以内の範
囲が適切である。Note that the 6-position in the radial direction of the cylindrical molding at the top end of the bending part (5) is not sufficient for the desired stretching and bending operation if it is too much in the center axis band, and the top end of the chevron-shaped protrusion (3) An appropriate range is within y from the top end side between the outer diameter where the troughs are connected and the inner diameter where the troughs are connected.

又、この山形突起部（３）をブロー成形にょＶ成形する
ときは、金型の関係から装部の肉厚は必らずしも同一厚
となることはなく、第２図に図示する如く山形突起部頂
端部において薄肉となる。そして、反面谷部においては
適宜、曲率を有して結局、両者によってヒンヂ性がもた
らされ、一様に圧縮し、襞を収縮σぜ、かつ、伸張する
とき配向に対する良好な力を与える。Furthermore, when this chevron-shaped protrusion (3) is V-formed by blow molding, the wall thickness of the covering part is not necessarily the same due to the mold, as shown in Fig. 2. The wall becomes thinner at the top of the chevron-shaped protrusion. On the other hand, the troughs have an appropriate curvature, and as a result, both of them provide a hinge property, and provide a good force for orientation when compressing uniformly and contracting and elongating the folds.

従って襞を伸張するに際し、頂端部における屈曲部（５
）と不等間隔な襞形成により伸張応力が相互に平衡状態
を脱して相互協動し、応力の利用の下に伸張を容易に行
なうことが可能となり、従来の等ピッチの型形状に比し
、遥かに小なる力で伸張することがＴき、又、収縮さぜ
ることも出来る。Therefore, when stretching the fold, the bending part (5
) and unevenly spaced folds, the elongation stress moves out of equilibrium and cooperates with each other, making it possible to easily elongate using stress, compared to the conventional mold shape with equal pitches. , it can be expanded with much less force, and it can also be contracted.

しかもこのような伸張、収縮時の応力作用により三次元
方向への屈曲も、軽快となり、成形物全体７− に無理な力の及ぶ傾向が減少される。Furthermore, due to the stress effect during expansion and contraction, the bending in the three-dimensional direction becomes easier, and the tendency for excessive force to be applied to the entire molded article 7- is reduced.

従って、従来の場合、伸張性を良くしようとすれば反撥
性のある樹脂が要求されていたが、別設、かかる必要は
なく、適用できる樹脂材料の範囲がより広汎となり成形
技術分骨の拡大に寄与する。Therefore, in the past, repellent resin was required in order to improve extensibility, but this is not necessary and the range of applicable resin materials is wider, expanding the scope of molding technology. Contribute to

本発明で得られる前記筒状成形物は、その伸張性、屈曲
自在性より５従来のホース、ストロ−に限らず、薬剤粉
末の収納筒を始め時代の先端を進むカプセル製品の開発
にも容易に進出可能であることは特筆されよう。Due to its extensibility and bendability, the cylindrical molded product obtained by the present invention is not limited to conventional hoses and straws, but can also be easily used to develop capsule products that are at the forefront of the times, such as storage tubes for drug powder. It should be noted that it is possible to expand into

本発明筒状物は、以上のように筒状成形物の蛇腹部の各
襞の山形突起に変化を与え、ピッチを不等ならしめると
共に山形突起部やや内方寄りの短面部に内部に入り込む
屈曲部を形成した構成からなり、不等間隔のピッチによ
り伸張時における引出応力を軽減し伸張を容易ならしめ
ることが出来るのみならず、頂端近傍の屈曲部により更
に伸張し、 時における伸張作用を促ｌヒンヂ性を増し蛇腹部′に有
する筒状成形物の蛇腹の役割を有効に発揮することがで
きる利点があり、しかも使用樹脂材料＝８＝ の適用範囲を拡大し、ブロー成形によるピンホールの皆
無化と相俟って蛇腹部をもつ各種合成樹脂製筒状物の用
途を広げ、流通管の外、各種容器への進出を許容し、そ
の実用的効用は極めて今後に期待されるものである。As described above, the cylindrical article of the present invention changes the chevron-shaped protrusions of each fold of the bellows part of the cylindrical molded product, makes the pitches unequal, and penetrates inside the chevron-shaped protrusions on the short side portion slightly inward. It has a structure with bent parts, and the unequal pitches not only reduce the pull-out stress during stretching and make it easier to stretch, but also the bent parts near the apex allow for further stretching, reducing the stretching action during time. It has the advantage of increasing the hinge properties and effectively playing the role of the bellows of the cylindrical molded material in the bellows part.Furthermore, it expands the range of application of the resin material used, and eliminates pinholes caused by blow molding. In conjunction with the total elimination of cylindrical materials, the use of various synthetic resin cylinders with bellows parts has been expanded, allowing them to be used in various types of containers outside of distribution pipes, and their practical utility is highly anticipated in the future. It is.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明に係る蛇腹部を有する筒状成形物の１例
を示す一部切欠正面図、第２図は同第１図Ａ部分拡大図
、第３図は構成の部分詳細説明図である。 （１）・・・筒状物、　（２）・・・蛇腹部。 （３）・・・山形突起部、（４）・・・突起頂端。 （５）・・・屈曲部、（Ｓ、）・・・長面部。 （Ｓ２）・・・短面部。 ９−Fig. 1 is a partially cutaway front view showing an example of a cylindrical molded product having a bellows portion according to the present invention, Fig. 2 is a partially enlarged view of Fig. 1A, and Fig. 3 is a partially detailed explanatory view of the structure. It is. (1)...A cylindrical object, (2)...A bellows part. (3)...A chevron-shaped protrusion, (4)...Apex of the protrusion. (5)...Bent part, (S,)...Long side part. (S2)...Short surface part. 9-

Claims (1)

【特許請求の範囲】 ／　蛇腹部を有し、長さ調節可能、かつ、屈曲自在な合
成樹脂筒状成形物の前記蛇腹部において、該蛇腹部を構
成する襞の山形突起部の頂角を挾む２面の筒状成形物軸
線上への投影長さを不等長となし、かつ、短面側の前記
突起部頂端やや内方寄りに、屈曲頂端が前記突起部頂端
より筒状成形物中心軸線への垂直平面上若しくはそれよ
り少くとも長面側寄りに位置する断面く字状又は逆く字
状の屈曲部を形成してなることを特徴とする蛇腹部を有
する合成樹脂製筒状物。 ２　山形突起部の頂角を挾む２つの面の筒状成形物軸線
上への投影長さの比を特徴とする特許請求の範囲第１項
記載の蛇腹部を有する合成樹脂製筒状物。 ３　襞の山形突起部の頂端部を薄肉とした特許請求の範
囲第１項又は第２項記載の蛇腹部を有する合成樹脂製筒
状物。 １−[Scope of Claims] / In the bellows part of a synthetic resin cylindrical molded product having a bellows part, length adjustable, and freely bendable, the apex angle of the chevron-shaped protrusion of the pleats constituting the bellows part The projection lengths on the axis of the two sandwiched sides of the cylindrical molded product are unequal, and the bent top end is formed into a cylindrical shape slightly inwardly from the top end of the projection on the short side. Synthetic resin cylinder having a bellows section characterized by forming a bent part with a doglegged or inverted doglegged cross section located on a plane perpendicular to the center axis of the object or at least closer to the long side. something like that. 2. A synthetic resin cylindrical article having a bellows portion as claimed in claim 1, characterized by a ratio of the projected lengths of two surfaces sandwiching the apex angle of the chevron-shaped protrusion onto the axis of the cylindrical molded article. . 3. A cylindrical article made of synthetic resin having a bellows portion according to claim 1 or 2, in which the top end of the chevron-shaped protrusion of the folds is thinned. 1-