JPH0551376B2

JPH0551376B2 -

Info

Publication number: JPH0551376B2
Application number: JP61209019A
Authority: JP
Inventors: Atsushi Takada
Original assignee: Maeda Manufacturing Co Ltd
Current assignee: Maeda Manufacturing Co Ltd
Priority date: 1986-09-05
Filing date: 1986-09-05
Publication date: 1993-08-02
Also published as: JPS6363541A

Description

【発明の詳細な説明】（産業上の利用分野）本発明は缶の天板の一部に円筒状の垂直立上部
を設け、該部に口金を外嵌固定するに際し、これ
を堅牢に行なう成形方法及びその缶口構造に関す
る。[Detailed Description of the Invention] (Field of Industrial Application) The present invention provides a cylindrical vertical upright part on a part of the top plate of a can, and securely fixes a cap to the outside of the part. This invention relates to a molding method and its mouth structure.

（従来の技術）缶口の成形方法及びその缶口は一般的に天板の
一部に円筒状の垂直立上部を設け、これに口金を
嵌挿し垂直立上部の上端縁を巻曲固定することに
なり行なわれ、例えば特公昭57−25288号に示さ
れている。(Prior art) Method of forming a can mouth and the can mouth generally includes a cylindrical vertical upright part provided on a part of the top plate, a cap inserted into this, and the upper edge of the vertical upright part rolled and fixed. For example, it is shown in Japanese Patent Publication No. 57-25288.

（発明の目的）本発明は口金の固定を堅牢にし、かつ、体裁の
良い缶口を成形することを特徴とする。(Object of the Invention) The present invention is characterized by making the cap firmly fixed and molding a can mouth with good appearance.

（発明の構成）以下、本発明の実施例を示す図面について説明
すれば、第１図は本発明の実施により成形された
缶口Ａの一部の拡大断面図で、ここにおいて１は
缶口Ａの天板、２は缶口Ａの開口部、３は天板１
に開口した円孔を中心にして成形した垂直立上筒
部、４は垂直立上筒部３に外嵌した固定口金、５
は垂直立上筒部３の外側の天板１に設けた環状凹
部で固定口金４の下端のフランジ４ａを収容す
る。４ｂ，５ａは回り止めの凹凸嵌め合い部で凹
部４ｂはフランジ４ａの下面に、凸部５ａは環状
凹部５に夫々いくつか設けて外嵌時に嵌め合わせ
る。６は内捲カール部７の基端からの外曲部であ
る。このような缶口Ａは以上に述べるように成形
される。即ち、第２図においてプレース状の缶の
天板１の一部にプレス加工を施して環状凹部５と
垂直立上筒部３を成形し、該筒部頂面に外周縁３
ａを残して円孔３ｂを開口する。上記工程中に前
記環状凹部５にいくつかの回り止めの凸部５ａを
成形加工する。(Structure of the Invention) Hereinafter, the drawings showing the embodiments of the present invention will be described. FIG. A is the top plate, 2 is the opening of can mouth A, 3 is the top plate 1
4 is a fixed base fitted onto the vertical rising cylinder part 3;
is an annular recess provided in the top plate 1 outside the vertically rising cylinder part 3, and accommodates the flange 4a at the lower end of the fixed base 4. Reference numerals 4b and 5a are concave and convex fitting portions to prevent rotation, and the concave portion 4b is provided on the lower surface of the flange 4a, and several convex portions 5a are provided in the annular concave portion 5, and these are fitted together when externally fitting. 6 is an outwardly curved portion from the base end of the inwardly curled portion 7. Such a can mouth A is formed as described above. That is, in FIG. 2, a part of the top plate 1 of a place-shaped can is pressed to form an annular recess 5 and a vertically rising cylinder part 3, and an outer peripheral edge 3 is formed on the top surface of the cylinder part.
The circular hole 3b is opened, leaving the hole a. During the above process, several anti-rotation protrusions 5a are formed in the annular recess 5.

上記垂直立上筒部３の成形後、第３図に示すよ
うに天板１の外周縁３ａに内捲カール部７をつく
るためにプレカール７ａを施した後に、第４図に
示すように内捲カール部７を完成する。 After forming the vertically rising cylinder part 3, as shown in FIG. 3, a pre-curl 7a is applied to the outer peripheral edge 3a of the top plate 1 to form an inwardly curled part 7, and then as shown in FIG. The curling portion 7 is completed.

次に、上記内捲カール部７をもつた垂直立上筒
部３に固定口金４を外嵌する。固定口金４は上部
外周に雄ネジ４ｃを、下部にフランジ４ａを有
し、かつ、このフランジ４ａの下面にいくつかの
回り止めの凹部４ｂを設けて前記垂直立上筒部３
に外挿し、環状凹部５に嵌合した時凹部４ｂと凸
部５ｂとを合わせて固定口金４の回り止めを行
う。 Next, the fixed base 4 is externally fitted onto the vertically rising cylinder part 3 having the inwardly curled part 7. The fixed cap 4 has a male thread 4c on the outer periphery of the upper part and a flange 4a on the lower part, and several recesses 4b for preventing rotation are provided on the lower surface of the flange 4a, so that the vertically rising cylinder part 3
When it is fitted into the annular recess 5, the recess 4b and the protrusion 5b are brought together to prevent the fixed base 4 from rotating.

次に第５図に示すように、内捲カール部７を基
端７ｂから外曲して固定口金４の上端面に外曲部
６を圧着し、天板１に固定口金４を固着する。固
定口金４はフランジ４ａが環状凹部５に嵌まつて
いるので周囲に移動することがなく、又回り止め
部により空転することなく安定して取付けられ
る。更に缶口Ａは内捲カール部７に縁どられるか
ら堅牢であり、他物に損傷を与えたりせず、しか
も体裁良く製品化できる。尚、Ｂは上型装置、Ｃ
は下型装置である。 Next, as shown in FIG. 5, the inwardly curled portion 7 is bent outward from the base end 7b, the outwardly curved portion 6 is crimped onto the upper end surface of the fixed cap 4, and the fixed cap 4 is fixed to the top plate 1. Since the flange 4a of the fixed cap 4 is fitted into the annular recess 5, the fixed cap 4 does not move around the periphery, and the fixed cap 4 can be stably mounted without idling due to the anti-rotation portion. Furthermore, since the can opening A is surrounded by the inner curled portion 7, it is strong, does not damage other items, and can be manufactured into a product with good appearance. In addition, B is the upper die device, C
is the lower die device.

本発明は以上のように内捲カール部７の成形
後、固定口金４を外挿するので容易に挿入できる
とともにカール部を基端から外曲して固定するの
で容易、かつ、堅牢に製品化できる。 As described above, in the present invention, after the inwardly curled portion 7 is formed, the fixed cap 4 is inserted externally, so that it can be easily inserted, and since the curled portion is fixed by outwardly bending from the base end, it can be manufactured easily and robustly. can.

更に、外曲した内捲カール部の巻端が外部に露
見せず体裁の良い缶口にでき巻端の加工や巻端の
ために他物に損傷を与えたりしない取扱い上便利
なものにできる種々の利点をもつ。 Furthermore, the ends of the outwardly curved inner curled portions are not exposed to the outside, resulting in a good-looking can mouth, and the can can be processed and handled conveniently without damaging other items due to the ends. It has various advantages.

[Brief explanation of the drawing]

第１図は要部の断面図、第２図から第５図は各
工程順の装置の部分断面図、第６図イからニは各
工程順に成形される缶口の断面図である。Ａ……缶口、Ｂ……上型装置、Ｃ……下型装
置、１……天板、３……垂直立上筒部、４……固
定口金、４ａ……フランジ、４ｂ……凹部、５…
…環状凹部、５ａ……凸部、６……外曲部、７…
…内捲カール部、７ａ……プレカール、７ｂ……
基端。 FIG. 1 is a sectional view of the main part, FIGS. 2 to 5 are partial sectional views of the apparatus in each process order, and FIGS. 6A to 6D are sectional views of the can opening formed in each process order. A...Can mouth, B...Upper mold device, C...Lower mold device, 1...Top plate, 3...Vertical rising tube part, 4...Fixed cap, 4a...Flange, 4b...Recessed part , 5...
...Annular recessed portion, 5a... Convex portion, 6... Externally curved portion, 7...
...Inner curl part, 7a... Pre-curl, 7b...
proximal end.

Claims

[Claims] 1. A cylindrical vertical upright part is provided on a part of the top plate of a can, a fixed cap is fitted onto the part, and the top edge of the vertical upright part is bent outward to attach the cap to the top plate. In the method of fixing and forming the can mouth, a circular hole 3b is made in a part of the top plate 1 of a plate-shaped can, and the cylindrical part 3 and the annular recess 5 are vertically raised from above the top plate around this hole. a step of forming several anti-rotation protrusions 5a in a part of the recess;
After applying a pre-curl 7a to the outer peripheral edge of the rising cylinder part 3, a step of forming an inner curl part 7, and a step of externally fitting the fixed cap 4 onto the rising cylinder part 3, and forming a recess on the lower surface of the cap. 4b and the convex portion 5a, and fixing the cap 4 to the top plate 1 by bending the inner curled portion 7 outward at the upper end of the cap 4. How to form a can mouth on a plate. 2. In a can mouth consisting of a cylindrical vertical upright part provided on a part of the top plate of the can, and a fixed cap fitted onto the part by bending the upper end of the upright part outward, the vertical upright cylindrical part An annular recess 5 is provided in the outer top plate 1, and the flange 4a of the fixed base 4 is fitted into the recess, and rotation-preventing uneven fitting parts 4b and 5a are provided on the joint surfaces of the annular recess 5 and the flange 4a. The can mouth is formed by crimping an outwardly curved part 6 which is bent outward from the base end 7b of the inwardly curled part 7 to the upper end of the fixed mouthpiece 4.