JP4369567B2

JP4369567B2 - Lid clamping chuck

Info

Publication number: JP4369567B2
Application number: JP28393899A
Authority: JP
Inventors: 正男八下田; 元巳横内; 榮規村上
Original assignee: Nippon Closures Co Ltd
Current assignee: Nippon Closures Co Ltd
Priority date: 1999-10-05
Filing date: 1999-10-05
Publication date: 2009-11-25
Anticipated expiration: 2019-10-05
Also published as: JP2001106293A

Description

【０００１】
【発明の属する技術分野】
本発明は、合成樹脂製容器蓋を容器の口頸部に螺着するための蓋締装置における、容器蓋を保持するためのチャックに関する。
【０００２】
【従来の技術】
周知の如く、飲料等のための容器として、口頸部の外周面に雄螺条が形成されている容器が使用され、かかる容器の口頸部は、スカート壁の内周面に雌螺条が形成されている合成樹脂製容器蓋を螺着することによって閉じられる。
【０００３】
容器の口頸部に合成樹脂製容器蓋を螺着するための蓋締装置の典型例としては、実公平５−２８２３７号公報に開示されている形態の蓋締装置を挙げることができる。かかる蓋締装置は、容器蓋を保持するためのチャックを備えた回転ヘッドを具備している。容器蓋をチャックに保持し、かかる容器蓋を容器の口頸部に被嵌し、そして回転ヘッドを所要方向に回転せしめることによって、容器の口頸部に容器蓋が螺着される。チャックは、下面が開放された略円筒形状の蓋収容空間を規定する内周面を有するチャック本体と、周方向に間隔をおいてチャック本体に装着された複数個の押圧部材と、押圧部材弾性偏倚手段とを具備している。押圧部材はチャック本体の内周面を越えて部分的に蓋収容空間に突出する最内側位置から外方へ退却自在にチャック本体に装着されており、押圧部材弾性偏倚手段は押圧部材を上記最内側位置に弾性偏倚する。押圧部材の、蓋収容空間内に突出せしめられる内側端部は、略半球状にせしめられている。チャック本体の蓋収容空間内にその下方から容器蓋が進入せしめられると、複数個の押圧部材が容器蓋のスカート壁の外周面に弾性的に係合し、これによって蓋収容空間内に容器蓋が保持される。
【０００４】
実開平２−５２７９３号公報には、蓋締装置のチャックにおける押圧部材を球から形成することが開示されている。
【０００５】
【発明が解決しようとする課題】
上述したとおりの形態の蓋締装置のチャックにおいては、チャックの蓋収容空間内に充分円滑に容器蓋を進入せしめることができると共に、蓋収容空間内に進入せしめられた容器蓋は脱落乃至変位されることなく充分確実に所要位置に保持される、ことが重要である。しかしながら、従来のチャックではかかる要件を充分確実に充足することができず、特に蓋収容空間に進入せしめられた容器蓋が偶発的に脱落する虞があった。
【０００６】
本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、蓋締装置におけるチャックを改良して、蓋収容空間に充分円滑に容器蓋を進入せしめることができると共に、蓋収容空間に進入せしめられた容器蓋は充分確実に所要位置に保持されるようになすことである。
【０００７】
【課題を解決するための手段】
本発明者等は鋭意研究の結果、押圧部材を、任意方向に回転自在に装着され且つ表面は中心線平均粗さＲａが０．５０乃至０．９０μｍの粗面である球から構成することによって上記技術的課題を達成することができることを見出した。
【０００８】
即ち、本発明によれば、上記技術的課題を達成する蓋締装置のチャックとして、下面が開放された略円筒形状の蓋収容空間を規定する内周面を有するチャック本体と、周方向に間隔をおいて該チャック本体に装着された複数個の押圧部材と、押圧部材弾性偏倚手段とを具備し、該押圧部材は該チャック本体の内周面を越えて部分的に該蓋収容空間に突出する最内側位置から半径方向外方へ退却自在に該チャック本体に装着されており、該押圧部材弾性偏倚手段は該押圧部材を該最内側位置に弾性偏倚する、蓋締装置のチャックにして、
該押圧部材は任意方向に回転自在に装着され且つ表面は中心線平均粗さＲａが０．５０乃至０．９０μｍの粗面である球から構成されている、ことを特徴とするチャックが提供される。
【０００９】
該粗面の中心線平均粗さＲａは０．６０乃至０．７０μｍであるのが好適である。粗面の粗さが過小の場合には、蓋収容空間に進入せしめられた容器蓋の保持が不充分になり、蓋収容空間から容器蓋が脱落する傾向がある。粗面の粗さが過大になると、蓋収容空間内への容器蓋の進入が円滑に遂行されなくなる傾向が発生する。押圧部材は、鋼球の表面をサンドペーパによって粗面にせしめることによって好都合に形成することができる。好適例においては、更に、平坦な下面が該蓋収容空間の上方に位置する最下降位置から上昇自在に装着された規制部材と、該規制部材を該最下降位置に弾性偏倚する規制部材弾性偏倚手段とが配設され、該蓋収容空間内に容器蓋が正常状態で収容されると、容器蓋の上面と該規制部材の下面との間には０．１乃至０．２ｍｍの間隙が存在する。
【００１０】
【発明の実施の形態】
以下、本発明に従って構成されたチャックの好適実施形態を図示している添付図面を参照して、更に詳細に説明する。
【００１１】
図１を参照して説明すると、全体を番号２で示すチャックは、略円筒形状の連結部材４を含んでいる。例えば上記実公平５−２８２３７号公報に開示されている如き形態でよい回転式蓋締装置には周方向に等間隔をおいて複数個の回転軸（図示していない）が配設されており、回転軸の各々に適宜のトルク制限機構（図示していない）を介して上記連結部材４が装着される。
【００１２】
連結部材４の下端部にはチャック本体６が固定されている。チャック本体６は比較的肉厚の略円筒形状である主部８を有し、この主部８の上面には環状肩部１０が形成され、そして更にこの肩部１０の上面内周部から上方に突出する比較的肉薄の円筒形状である突出部１２が形成されている。突出部１２の外周面には雄螺条が形成されている。一方、上記連結部材４の下端部内周面には雌螺条が形成されており、かかる雌螺条に突出部１０に形成されている上記雄螺条を螺合せしめることによって連結部材４の下端部にチャック本体６が固定されている。連結部材４の下端がチャック本体６の肩部１０の上面に当接せしめられ、これによって連結部材４に対するチャック本体６の上下方向位置が充分精密に規制される。
【００１３】
チャック本体６における主部８の内周面は下面が開放された蓋収容空間１４を規定している。図１共に図２を参照して説明を続けると、蓋収容空間１４を規定している主部８の内周面下端部１６は上方に向かって半径方向内方に例えば４５度程度でよい比較的大きな傾斜角度αをなして傾斜せしめられており、かかる下端部に続く内周面主部１８は上方に向かって半径方向内方に例えば４度程度でよい若干の傾斜角度βで傾斜せしめられている。内周面主部１８には周方向に所定間隔をおいて多数の突条２０が形成されている（図４も参照されたい）。図２と共に図３を参照して説明を続けると、チャック本体６における主部８の下部外周面には環状溝２２が形成されている。この環状溝２２の断面形状は略矩形状であり、その深さ即ち半径方向寸法は主部８の肉厚の半分よりも幾分大きく設定されている。更に、チャック本体６における主部８には、周方向に間隔をおいて複数個、図示の実施形態では６個、の貫通孔２４が形成されている。図２から明確に理解されるとおり、貫通孔２４の各々は環状溝２２と交差して実質上水平に半径方向に延在せしめられている。貫通孔２４の各々の断面形状は円形であり、貫通孔２４の各々の主部は実質上同一の内径を有するが、半径方向内端部は半径方向内方に向かって内径が漸次減少せしめられていて円錐台形状を呈している。貫通孔２４の各々には球形状の押圧部材２６が配置されている。押圧部材２６の外径は貫通孔２４の各々の主要部の内径と実質上同一或いはそれより幾分小さい。従って、押圧部材２６の各々は、図２に図示する最内側位置、即ちその一部が貫通孔２４の半径方向内側端から（従って主部８の内周面を越えて）部分的に蓋収容空間１４内に突出する最内側位置から半径方向外方に退却自在に、且つ任意の方向に回転自在に、貫通孔２４内に配置されている。環状溝２２には、合成ゴムリングから形成することができる押圧部材弾性偏倚手段２８が収容されている。かかる押圧部材弾性偏倚手段２８は、貫通孔２４内に配置されている押圧部材２６の各々に作用して押圧部材２６の各々を半径方向内方に、従って最内側位置に弾性的に偏倚する。
【００１４】
後に更に詳述する如く、チャック本体６の蓋収容空間１４内にはその開放された下面を通して、合成樹脂製容器蓋３０が進入せしめられるが、押圧部材２６の各々は貫通孔２４の半径方向内側端から蓋収容空間１４内に突出した一部が容器蓋３０に（更に詳しくはそのスカート壁の外周面に）弾性的に係合し、これによって蓋収容空間１４から容器蓋３０が脱落することが防止される。任意方向に回転自在である球形状である押圧部材２６は容器蓋３０に弾性的に係合する表面が、ＪＩＳＢ０６０１に規定されている中心線平均粗さＲａで０．５０乃至０．９０μｍ、好ましくは０．６０乃至０．７０μｍ、の粗さを有することが重要である。表面粗さが過小になると、蓋収容空間１４内に進入せしめられた容器蓋３０の保持が不充分になり、蓋収容空間１４から容器蓋３０が脱落する傾向が発生する。他方、表面粗さが過大になると、蓋収容空間１４内への容器蓋３０の進入に対する押圧部材２６の抵抗が過剰になり、蓋収容空間１４内へ容器蓋３０を円滑に進入せしめることが困難になる傾向がある。かような押圧部材２６は、玉軸受用鋼球の表面にサンドペーパを作用せしめて粗面にせしめることによって好都合に構成することができる。
【００１５】
図１を参照して説明すると、上述した連結部材４には、略円筒形状の保持部材３２も固定されている。この保持部材３２の内周面下端には半径方向内方に突出した環状フランジ３４が形成され、外周面下端部には半径方向外方に突出した環状フランジ３６が形成されている。一方、連結部材４の内周面には下方を向いた環状肩部３８が形成されている。保持部材３２の環状フランジ３６は、連結部材４の環状肩部３８と上述したチャック本体６の突出部１２の上端との間に挟持され、かくして連結部材４に保持部材３２が固定される。保持部材３２には規制部材４０が保持されている。図示の実施形態における規制部材４０は、円板形状の主部４２、かかる主部４２の上面外周縁部から上方に延びる円筒状延出部４４、及び延出部４４の外周面上端から半径方向外方に突出した環状フランジ４６を有する。規制部材４０の環状フランジ４６を保持部材３２の環状フランジ３４の上方に位置せしめることによって、保持部材３２に規制部材４０が懸架せしめられる。規制部材４０の主部４２の上面上には押圧ロッド４８が配設されている。押圧ロッド４８の下端には半径方向外方に突出する環状フランジ５０が形成されている。一方、連結材４の内周面上端部には半径方向内方に突出する環状フランジ５２が形成されている。そして、押圧ロッド４８の環状フランジ５０と連結部材４の環状フランジ５２との間には圧縮コイルから構成された規制部材弾性偏倚手段５４が介在せしめられている。規制部材弾性偏倚手段５４は押圧ロッド４８及び規制部材４０を下方に弾性的に偏倚して、規制部材４０の環状フランジ４６を保持部材３２の環状フランジ３４に当接せしめる。規制部材４０が図１及び図２に図示する最下位置に位置せしめられている状態において、チャック本体６の蓋収容空間１４内に容器蓋３０が所要とおりに正常状態で収容された状態において、規制部材４０の平坦な下面と容器蓋３０の平坦な上面との間には０．１乃至０．２ｍｍの間隔Ｇ（図２）が存在するのが好適である。
【００１６】
図１及び図２を参照して説明を続けると、チャック本体６の蓋収容空間１４内に収容される合成樹脂製容器蓋３０自体は、所謂タンパーエビデント特性を有する公知の形態のものでよい。かかる容器蓋３０は円形天面壁５６とかかる天面壁５６の周縁から垂下する略円筒形状のスカート壁５８とを有する。スカート壁５８には周方向に延びる破断ライン６０が形成されており、スカート壁５８は破断ライン６０よりも上方の主部と破断ライン６０よりも下方のタンパーエビデント裾部とに区画されている。図４に明確に図示する如く、スカート壁５８の主部外周面には周方向に等間隔をおいて多数の突条６２が形成されている。図示の実施形態においては、チャック本体６の内周面主部１８に形成されている上記突条２０のピッチをＰ１とし、容器蓋３０のスカート壁５８の主部外周面に形成された突条６２のピッチをＰ２とすると、Ｐ１＝２×Ｐ２に設定されており、例えば、チャック本体６には６０本の突条２０が形成され、容器蓋３０には１２０本の突条６２が形成されている。
【００１７】
チャック本体６の蓋収容空間１４内に下方から容器蓋３０が進入せしめられると、図４に明確に図示する如く、チャック本体６の内周面主部１８に形成されている突条２０の各々の間に容器蓋３０のスカート壁５８の主部外周面に形成されている突条６２が夫々２本毎位置せしめられる。そして、貫通孔２４の内側端を通して部分的に蓋収容空間１４に突出せしめられている押圧部材２６が容器蓋３０のスカート壁５８の外周面に弾性的に係合し、かくして蓋収容空間１４から容器蓋３０が脱落することが防止される。容器蓋３０を容器の口頸部（図示していない）に装着する際には連結部材４が所定方向に回転せしめられ、これに応じてチャック本体６も所定方向に回転せしめられる。そして、チャック本体６のかかる回転が上記突条２０及び６２を介して容器蓋３０に伝動される。容器蓋３０が直立状態ではなくて幾分傾斜した状態でチャック本体６の蓋収容空間１４内に進入せしめられた場合には、容器蓋３０の上端が規制部材４０の下面に当接し、弾性的に下方に偏倚せしめられている規制部材４０の作用によって直立状態に矯正される。
【００１８】
【発明の効果】
本発明の蓋締装置のチャックにおいては、蓋収容空間に充分円滑に容器蓋を進入せしめることができ、そしてまた蓋収容空間に進入せしめられた容器蓋は充分確実に所要位置に保持される。
【図面の簡単な説明】
【図１】本発明に従って構成された蓋締装置のチャックの好適実施形態を示す断面図。
【図２】図１のチャックの主要部を、一部を側面で一部を断面で示す拡大図。
【図３】図１のチャックのチャック本体の一部を示す拡大部分断面図。
【図４】図１のチャックのチャック本体における突条と容器蓋の突条との関係を示す部分断面図。
【符号の説明】
２：チャック
６：チャック本体
１４：蓋収容空間
２６：押圧部材
２８：押圧部材弾性偏倚手段
３０：合成樹脂製容器蓋
４０：規制部材
５４：規制部材弾性偏倚手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chuck for holding a container lid in a lid fastening device for screwing a synthetic resin container lid onto a mouth and neck portion of the container.
[0002]
[Prior art]
As is well known, a container having a male thread formed on the outer peripheral surface of the mouth-and-neck part is used as a container for beverages or the like, and the mouth-neck part of the container is formed on the inner peripheral surface of the skirt wall. Is closed by screwing a synthetic resin container lid on which is formed.
[0003]
A typical example of a lid clamping device for screwing a synthetic resin container lid on the mouth and neck of the container is a lid clamping device disclosed in Japanese Utility Model Publication No. 5-28237. Such a lid-clamping device includes a rotary head provided with a chuck for holding a container lid. The container lid is screwed onto the mouth and neck of the container by holding the container lid on the chuck, fitting the container lid on the mouth and neck of the container, and rotating the rotary head in the required direction. The chuck includes a chuck body having an inner peripheral surface defining a substantially cylindrical lid housing space with an open bottom surface, a plurality of pressing members mounted on the chuck body at intervals in the circumferential direction, and a pressing member elasticity. Biasing means. The pressing member is mounted on the chuck body so as to be able to retreat outward from the innermost position partially protruding into the lid housing space beyond the inner peripheral surface of the chuck body, and the pressing member elastic biasing means attaches the pressing member to the outermost position. Elastically biased to the inner position. An inner end portion of the pressing member that protrudes into the lid housing space is substantially hemispherical. When the container lid is inserted into the lid housing space of the chuck body from below, the plurality of pressing members are elastically engaged with the outer peripheral surface of the skirt wall of the container lid, whereby the container lid is placed in the lid housing space. Is retained.
[0004]
Japanese Utility Model Laid-Open No. 2-52793 discloses that a pressing member in a chuck of a lid fastening device is formed from a sphere.
[0005]
[Problems to be solved by the invention]
In the chuck of the lid tightening device having the above-described form, the container lid can enter the lid housing space sufficiently smoothly and the container lid that has entered the lid housing space is dropped or displaced. It is important that it is held in the required position sufficiently reliably without any problems. However, such a requirement cannot be satisfied sufficiently with the conventional chuck, and in particular, the container lid that has entered the lid housing space may accidentally fall off.
[0006]
The present invention has been made in view of the above-mentioned facts, and its main technical problem is to improve the chuck in the lid tightening device so that the container lid can enter the lid housing space sufficiently smoothly and cover the lid. The container lid that has entered the space is to be surely held in the required position.
[0007]
[Means for Solving the Problems]
As a result of diligent research, the inventors have made the pressing member to be composed of a sphere having a rough surface with a centerline average roughness Ra of 0.50 to 0.90 μm, which is mounted rotatably in an arbitrary direction . It has been found that the above technical problem can be achieved.
[0008]
That is, according to the present invention, as a chuck of a lid fastening device that achieves the above technical problem, a chuck main body having an inner peripheral surface that defines a substantially cylindrical lid housing space whose lower surface is opened, and a circumferentially spaced gap are provided. And a plurality of pressing members mounted on the chuck body and pressing member elastic biasing means, the pressing members partially projecting into the lid housing space beyond the inner peripheral surface of the chuck body. The chuck body is mounted on the chuck body so as to be retractable radially outward from the innermost position, and the pressing member elastic biasing means is a chuck of a lid clamping device that elastically biases the pressing member to the innermost position.
There is provided a chuck characterized in that the pressing member is mounted rotatably in an arbitrary direction, and the surface is composed of a sphere having a rough surface with a center line average roughness Ra of 0.50 to 0.90 μm. The
[0009]
The center line average roughness Ra of the rough surface is 0 . The thickness is preferably 60 to 0.70 μm. When the roughness of the rough surface is too small, the container lid that has entered the lid housing space is not sufficiently held, and the container lid tends to drop out of the lid housing space. If the roughness of the rough surface becomes excessive, there is a tendency that the container lid does not smoothly enter the lid housing space . Push member may be conveniently formed by allowed to the surface of the steel ball on the rough surface by the sandpaper. In a preferred example, a regulating member having a flat lower surface mounted so as to be freely raised from a lowest position positioned above the lid housing space, and a regulating member elastic bias that elastically biases the regulating member to the lowest position. When the container lid is accommodated in the lid housing space in a normal state, a gap of 0.1 to 0.2 mm exists between the upper surface of the container lid and the lower surface of the regulating member. To do.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a chuck constructed according to the present invention will be described in more detail with reference to the accompanying drawings.
[0011]
Referring to FIG. 1, the chuck denoted as a whole by numeral 2 includes a substantially cylindrical connecting member 4. For example, a rotary lid fastening device that may be in the form disclosed in the above Japanese Utility Model Publication No. 5-28237 has a plurality of rotating shafts (not shown) arranged at equal intervals in the circumferential direction. The connecting member 4 is attached to each of the rotation shafts via an appropriate torque limiting mechanism (not shown).
[0012]
A chuck body 6 is fixed to the lower end portion of the connecting member 4. The chuck body 6 has a main portion 8 having a relatively thick and substantially cylindrical shape. An annular shoulder portion 10 is formed on the upper surface of the main portion 8, and further upward from the inner peripheral portion of the upper surface of the shoulder portion 10. A projecting portion 12 having a relatively thin cylindrical shape projecting in the shape is formed. A male thread is formed on the outer peripheral surface of the protrusion 12. On the other hand, a female thread is formed on the inner peripheral surface of the lower end portion of the connecting member 4, and the lower end of the connecting member 4 is formed by screwing the male thread formed on the protruding portion 10 to the female thread. The chuck body 6 is fixed to the portion. The lower end of the connecting member 4 is brought into contact with the upper surface of the shoulder portion 10 of the chuck body 6, whereby the vertical position of the chuck body 6 with respect to the connecting member 4 is regulated sufficiently accurately.
[0013]
The inner peripheral surface of the main portion 8 in the chuck body 6 defines a lid housing space 14 whose lower surface is open. 1 and FIG. 2, the description will be continued with reference to FIG. 2. The lower end portion 16 of the inner peripheral surface of the main portion 8 defining the lid housing space 14 may be, for example, about 45 degrees radially inward. The inner peripheral surface main portion 18 following the lower end is inclined at a slight inclination angle β that may be, for example, about 4 degrees radially inwardly. ing. A large number of protrusions 20 are formed on the inner peripheral surface main portion 18 at predetermined intervals in the circumferential direction (see also FIG. 4). When the description is continued with reference to FIG. 3 together with FIG. 2, an annular groove 22 is formed on the lower outer peripheral surface of the main portion 8 in the chuck body 6. The cross-sectional shape of the annular groove 22 is substantially rectangular, and its depth, that is, the radial dimension, is set to be somewhat larger than half the thickness of the main portion 8. Further, a plurality of through-holes 24 in the illustrated embodiment are formed in the main portion 8 of the chuck body 6 at intervals in the circumferential direction. As clearly understood from FIG. 2, each of the through holes 24 extends in a radial direction substantially horizontally across the annular groove 22. The cross-sectional shape of each of the through holes 24 is circular, and the main portions of each of the through holes 24 have substantially the same inner diameter. However, the inner diameter of the radially inner end is gradually decreased toward the inner side in the radial direction. It has a truncated cone shape. A spherical pressing member 26 is disposed in each of the through holes 24. The outer diameter of the pressing member 26 is substantially the same as or slightly smaller than the inner diameter of each main portion of the through hole 24. Accordingly, each of the pressing members 26 is partially covered with the lid from the innermost position shown in FIG. 2, that is, a part thereof from the radially inner end of the through-hole 24 (and thus beyond the inner peripheral surface of the main portion 8). It arrange | positions in the through-hole 24 so that it can retract in the radial direction outward from the innermost position which protrudes in the space 14, and it can rotate to arbitrary directions. The annular groove 22 accommodates a pressing member elastic biasing means 28 that can be formed from a synthetic rubber ring. The pressing member elastic biasing means 28 acts on each of the pressing members 26 arranged in the through hole 24 to elastically bias each of the pressing members 26 inward in the radial direction, and therefore in the innermost position.
[0014]
As will be described in detail later, a synthetic resin container lid 30 is caused to enter the lid housing space 14 of the chuck body 6 through the opened lower surface, and each of the pressing members 26 is located radially inside the through hole 24. A part protruding from the end into the lid housing space 14 is elastically engaged with the container lid 30 (more specifically, the outer peripheral surface of the skirt wall), and thereby the container lid 30 is dropped from the lid housing space 14. Is prevented. The spherically shaped pressing member 26 that can freely rotate in any direction has a surface elastically engaged with the container lid 30 having a centerline average roughness Ra defined by JIS B 0601 of 0.50 to 0.90 μm. It is important to have a roughness of preferably 0.60 to 0.70 μm. When the surface roughness is excessively small, the container lid 30 that has entered the lid housing space 14 is not sufficiently held, and the container lid 30 tends to drop out of the lid housing space 14. On the other hand, if the surface roughness is excessive, the resistance of the pressing member 26 against the entry of the container lid 30 into the lid housing space 14 becomes excessive, and it is difficult to smoothly enter the container lid 30 into the lid housing space 14. Tend to be . Or the pressing member 26 as can be conveniently constructed by the allowed to the rough surface caused to act sandpaper on the surface for ball bearing steel ball.
[0015]
If it demonstrates with reference to FIG. 1, the substantially cylindrical holding member 32 will also be fixed to the connection member 4 mentioned above. An annular flange 34 projecting radially inward is formed at the lower end of the inner peripheral surface of the holding member 32, and an annular flange 36 projecting radially outward is formed at the lower end of the outer peripheral surface. On the other hand, an annular shoulder 38 facing downward is formed on the inner peripheral surface of the connecting member 4. The annular flange 36 of the holding member 32 is sandwiched between the annular shoulder 38 of the connecting member 4 and the upper end of the protruding portion 12 of the chuck body 6 described above, and thus the holding member 32 is fixed to the connecting member 4. The holding member 32 holds a regulating member 40. Regulating member 40 in the illustrated embodiment, the radius from the outer peripheral surface upper end of the disk main portion 42 of the shape, a cylindrical extending portion 44 extending from an upper surface outer circumferential edge portions of such main portion 42 upward, and the extended portions 44 It has an annular flange 46 projecting outward in the direction. By positioning the annular flange 46 of the regulating member 40 above the annular flange 34 of the holding member 32, the regulating member 40 is suspended from the holding member 32. A pressing rod 48 is disposed on the upper surface of the main portion 42 of the regulating member 40. An annular flange 50 that protrudes radially outward is formed at the lower end of the pressing rod 48. On the other hand, an annular flange 52 protruding inward in the radial direction is formed at the upper end portion of the inner peripheral surface of the connecting member 4. A restricting member elastic biasing means 54 composed of a compression coil is interposed between the annular flange 50 of the pressing rod 48 and the annular flange 52 of the connecting member 4. The restricting member elastic biasing means 54 elastically biases the pressing rod 48 and the restricting member 40 downward so that the annular flange 46 of the restricting member 40 is brought into contact with the annular flange 34 of the holding member 32. In a state where the regulating member 40 is brought located lowermost position shown in FIGS. 1 and 2, in a state where the container closure 30 in the lid accommodation space 14 of the chuck body 6 is accommodated in the normal state the required as, It is preferable that a gap G (FIG. 2) of 0.1 to 0.2 mm exists between the flat lower surface of the regulating member 40 and the flat upper surface of the container lid 30.
[0016]
1 and 2, the synthetic resin container lid 30 itself accommodated in the lid accommodating space 14 of the chuck body 6 may be of a known form having so-called tamper evidence characteristics. . The container lid 30 includes a circular top wall 56 and a substantially cylindrical skirt wall 58 that hangs down from the periphery of the top wall 56. A rupture line 60 extending in the circumferential direction is formed in the skirt wall 58 , and the skirt wall 58 is partitioned into a main portion above the break line 60 and a tamper evidence skirt below the break line 60. . As clearly shown in FIG. 4, a large number of protrusions 62 are formed on the outer peripheral surface of the main part of the skirt wall 58 at equal intervals in the circumferential direction. In the illustrated embodiment, the pitch of the ridges 20 formed on the inner peripheral surface main portion 18 of the chuck body 6 is P1, and the ridges formed on the outer peripheral surface of the main portion of the skirt wall 58 of the container lid 30. Assuming that the pitch of 62 is P2, P1 = 2 × P2. For example, 60 ridges 20 are formed on the chuck body 6, and 120 ridges 62 are formed on the container lid 30. ing.
[0017]
When the container lid 30 enters the lid housing space 14 of the chuck body 6 from below, each of the protrusions 20 formed on the inner peripheral surface main portion 18 of the chuck body 6 is clearly shown in FIG. In the meantime, two protrusions 62 formed on the outer peripheral surface of the main portion of the skirt wall 58 of the container lid 30 are respectively positioned. Then, the pressing member 26 partially protruded into the lid accommodating space 14 through the inner end of the through hole 24 is elastically engaged with the outer peripheral surface of the skirt wall 58 of the container lid 30, and thus from the lid accommodating space 14. The container lid 30 is prevented from falling off. When the container lid 30 is mounted on the mouth / neck portion (not shown) of the container, the connecting member 4 is rotated in a predetermined direction, and the chuck body 6 is also rotated in a predetermined direction accordingly. Then, the rotation of the chuck body 6 is transmitted to the container lid 30 via the protrusions 20 and 62. When the container lid 30 is not in an upright state but is slightly inclined and entered into the lid housing space 14 of the chuck body 6, the upper end of the container lid 30 comes into contact with the lower surface of the regulating member 40 and is elastic. It is corrected to an upright state by the action of the restricting member 40 biased downward.
[0018]
【The invention's effect】
In the chuck of the lid tightening device of the present invention, the container lid can enter the lid accommodating space sufficiently smoothly, and the container lid that has entered the lid accommodating space is held in a required position with sufficient reliability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a preferred embodiment of a chuck of a lid fastening device constructed according to the present invention.
FIG. 2 is an enlarged view showing a main part of the chuck of FIG. 1 partly in side view and partly in cross section.
3 is an enlarged partial cross-sectional view showing a part of a chuck body of the chuck of FIG. 1;
4 is a partial cross-sectional view showing a relationship between a protrusion on the chuck body of the chuck of FIG. 1 and a protrusion on the container lid.
[Explanation of symbols]
2: Chuck 6: Chuck body 14: Lid receiving space 26: Press member 28: Press member elastic biasing means 30: Plastic container lid 40: Restricting member 54: Restricting member elastic biasing means

Claims

A chuck body having an inner peripheral surface defining a substantially cylindrical lid housing space with an open lower surface, a plurality of pressing members mounted on the chuck body at intervals in the circumferential direction, and a pressing member elastic biasing means The pressing member is attached to the chuck body so as to be able to retreat radially outward from the innermost position partially protruding into the lid housing space beyond the inner peripheral surface of the chuck body, The pressing member elastic biasing means serves as a chuck of a lid fastening device that elastically biases the pressing member to the innermost position.
The chuck characterized in that the pressing member is mounted so as to be rotatable in an arbitrary direction, and the surface is constituted by a sphere having a rough surface with a center line average roughness Ra of 0.50 to 0.90 μm .

The center line average roughness Ra of the crude surface is 0.60 to 0.70 .mu.m, claim 1 chuck according.

The chuck according to claim 1 or 2 , wherein the pressing member is formed by roughening the surface of a steel ball with sandpaper.

Further, a regulation member having a flat lower surface mounted so as to be able to ascend freely from a lowest position positioned above the lid housing space, and a regulation member elastic biasing means for elastically biasing the regulation member to the lowest position. When the container lid is housed in the lid housing space in a normal state, a gap of 0.1 to 0.2 mm exists between the upper surface of the container lid and the lower surface of the regulating member. The chuck according to any one of 3 to 3 .