Sheet metal container making – Method – Forming or treating metallic closure
Patent
1997-09-29
1999-03-09
Coan, James F.
Sheet metal container making
Method
Forming or treating metallic closure
413 2, 413 27, 413 67, 220270, B21D 5144, B65D 1734
Patent
active
058791205
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method of seaming a circular cover panel provided with a turnable pull ring onto the body of a can, whereby said cover panel comprises a circumferential score line accommodated as close as possible to rim portion of said panel.
BACKGROUND ART
A circular can with a pull ring is known, where said pull ring is placed radially on the cover panel, the nose of said pull ring being positioned adjacent a score line provided close to the rim portion of the cover panel. Such a positioning of the pull ring and its nose is not totally satisfactory because the closing chuck necessary for seaming the cover panel onto the body of the can cannot be provided with a constant outline. The closing chuck must be provided with a recess or perforation in front of the nose. Here it is assumed that the closing chuck is joined with the cover panel very close to the rim portion of said cover panel in such a manner that it can provide a support for an exterior seaming equipment. A closing chuck of a varying cross section along its entire circumference has inter alia the result that when placed on the cover seaming machine the individual cover panels are positioned very accurately. In other words, the pull ring must be positioned in front of a very specific location on the chuck when the seaming procedure is initiated, which is a very complicating factor. It would be much easier for the operator during the positioning of the can if he did not have to consider the pull ring.
BRIEF DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a method of the above type, which is far more simple and less expensive than the known method because it is possible to use a closing chuck of a uniform cross section along its entire circumference.
The method according to the invention is characterised in that the pull ring on the cover panel used is mounted on said cover panel in a non-radial position, whereby both a clearance between the rim portion of the cover panel and the nose of the pull ring and a clearance between the rim portion of the cover panel and the handle part of the pull ring are provided in such a manner that a closing chuck can be inserted in said clearances during the seaming of the cover panel. The resulting seaming operation is very simple and rational partly because a penetration or recess is completely avoided in the closing chuck and partly because the cover panel need not be angularly positioned on the seaming machine before said closing chuck is lowered onto said cover panel.
According to the invention the clearance at the nose may be of a width of 0.5 to 1.5 mm, such as 1.0 mm, while the clearance at the handle part may be of a width of 8 to 12 mm, such as 10 mm. This turned out to be particularly advantageous.
Furthermore, the longitudinal axis of the pull ring may according to the invention in the non-radial position on the cover panel form an angle .alpha. with radius to the centre of rotation of the pull ring, .alpha. being in the range 18 to 25.degree., such as approximately 22.degree.. In this manner advantageous clearances are obtained at the pull ring in question.
The invention relates also to a can with a cover panel and a body, where the cover panel is mounted by the method according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in greater details below with reference to the accompanying drawings, in which
FIG. 1 is a top view of a circular cover panel to be used by the method according to the invention, and
FIG. 2 is a cross-sectional view of a closing chuck used by the method according to the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
The cover panel 1 of FIG. 1 has been prepared for use by the method according to the invention. A pull ring 2 with a nose 3 is riveted on the cover panel 1. The pull ring 2 and the nose 3 can turn about the hollow rivet 4 and are accommodated in a non-radial position on the cover panel. By "non-radial position" is meant that the longitudinal axis 8 of the pull rin
REFERENCES:
patent: 3198155 (1965-08-01), Fraze
patent: 3543961 (1970-12-01), Kennedy et al.
patent: 3795340 (1974-03-01), Hougen et al.
patent: 3964632 (1976-06-01), Bozek
patent: 4685849 (1987-08-01), La Barge et al.
Coan James F.
Glud & Marstrand A/S
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