Receptacles – Outlet or junction box type – Sectional receptacle
Patent
1988-04-11
1989-12-19
Foster, Jimmy G.
Receptacles
Outlet or junction box type
Sectional receptacle
220270, 413 13, 413 14, 413 18, 428 64, 428 66, A47G 1922, B21D 5144, B32B 302
Patent
active
048877328
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an easy-open can lid in which the cut edge can be covered. More particularly, the present invention relates to an easy-open can lid in which opening can be easily performed without using any particular tool and at the time of opening, a sharp cut edge is covered with a resin extending outwardly of the cut edge and the finger or the like is protected against a hurt. Especially, the present invention relates to an easy-open can lid which is excellent in the corrosion resistance of a score portion and also in the stain resistance of a covering strip of a protecting resin. Furthermore, the present invention relates to a process for the preparation of an easy-open can lid as described above.
2. Background Art
A so-called full-open can lid is known as the conventional easy-open lid for a can or a similar vessel. In this can lid, an opening score defining a portion to be opened is formed and an opening tab is arranged in this portion to be opened. At the time of opening, the score is shorn and the portion to be opened is taken out from the peripheral portion of the can lid. A sharp cut edge is present on the periphery of the removed portion and it often happens that the finger is hurt by contact with this sharp cut edge.
Various methods have been proposed for protecting the finger against a hurt by covering the sharp cut edge formed by cutting of the score with a covering resin strip formed on the can lid in advance. For example, there can be mentioned a method in which a covering resin strip is formed on the inner or outer surface of the can lid to stride over the score so that the covering resin strip is broken when the score is cut and both the cut edge of the removed portion and the cut edge of the residual peripheral portion are covered with the resin strip (see Japanese Patent Publication No. 20907/79 and Japanese Patent Publication No. 44540/82), and a method in which a covering resin strip is formed to stride over the score so that at the time of opening, the covering resin strip is not broken but is left adhering to the removed portion or the residual peripheral portion (see Japanese Patent Publication No. 18872/76 and Japanese Utility Model Application Laid-Open Specification No. 10728/85).
In the former proposal, since the covering resin strip should be broken simultaneously with cutting of the score, it is necessary that the covering resin strip should be relatively brittle or the thickness should be reduced. Furthermore, since the resin covering is present on the same plane as the cut edge of the can lid, the direct contact of the finger with the cut edge is not sufficiently prevented and the protecting effect is still insufficient.
In the latter easy-open lid having a covering resin strip, since an adhesive primer is coated on the portion where the covering resin strip of the lid is left while the primer is not coated on the portion where the covering resin strip is peeled, troublesome complicated operations are necessary, and the method is still insufficient in the productivity and manufacturing cost. Moreover, if there is not adopted any means for coating the adhesive primer on one portion while not coating the primer on the other portion, whether the covering resin strip is peeled in the state adhering to the removed portion or is left in the state adhering to the residual peripheral portion cannot be strictly controlled.
Furthermore, in the conventional easy-open lid, the opening tab is fixed by riveting, and in order to prevent damage of the score and attain precise positioning, it is generally indispensable that riveting should be accomplished by conducting bulbing, bulb reforming, buttoning, scoring and sticking in this order, and therefore, it is necessary that the protecting resin should be applied to the score after attachment of the opening tab.
Accordingly, the push-tearing top end (nose) of the opening tab should be located on the score of the opening-initiating part, and hence, the organic resin covering cannot be formed
REFERENCES:
patent: 3754678 (1973-08-01), Fox et al.
patent: 3765561 (1973-10-01), Hekal et al.
patent: 3809283 (1974-05-01), Kehe
patent: 3855026 (1974-12-01), Fox et al.
patent: 4044916 (1977-08-01), Beveridge
patent: 4403710 (1983-09-01), Hirota et al.
patent: 4428494 (1984-01-01), Hirota et al.
patent: 4762245 (1988-08-01), Matsubayashi et al.
Aizawa Masanori
Ikegami Tamotsu
Matsubayashi Hiroshi
Shimizu Takashi
Watanabe Michio
Foster Jimmy G.
Stucker Nova
Toyo Seikan Kaisha Ltd.
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