Special receptacle or package – Article housing attached to panel – Movable or detachable housing closure
Patent
1983-02-22
1985-01-29
Lowrance, George E.
Special receptacle or package
Article housing attached to panel
Movable or detachable housing closure
24615, 24651, 29523, 206461, 220272, B65D 7300
Patent
active
044960522
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method to secure a first part of a plastic material to a second part. The first part may constitute part of a package assembly such as the main part of a blister package. A securing means for carrying out the method is also comprised by the invention.
BACKGROUND
Blister packages comprise a package part in the form of a hot formed plastic sheet usually of the transparent type. The plastic sheet is provided with at least one deep embossed portion, which forms a container for the article to be packed. Thus, the plastic sheet forms the laterals and the top portions of the container, but the package requiring an additional closing sheet on the side of the embossed cavity left open. It is therefore a very common feature that a piece of cardboard is placed against the plastic sheet to be secured to the same. In certain cases a container stretching in opposite directions from the plastic sheet is desired, and then two deepembossed plastic sheets can be laid together, their plane, not embossed portions being fitted to each other. There are also packages in which the plastic sheet has been folded, so that two portions are formed, which can be fitted to each other.
In order to hold together the two parts or portions thus required for the sealing of the package, a great number of different means have been used. Staples or similar and a seal made by means of a glueing or welding operation are quite common. It has also been suggested that tube shaped projections might be shaped in the plastic sheet by means of a hot forming operation, which projections might be riveted to a retaining rivet head. More particularly the invention relates to this type of securing means.
TECHNICAL PROBLEM
However, the fastening means mentioned require comparatively complicated accessories. When using staples, metal parts are also introduced which can give rise to drawbacks, and when glueing or welding as well as when recurring to a riveting operation of the type mentioned, a great portion of the package must be destroyed, when the same is opened up, which in many cases may signify a drawback. The said riveting of tube shaped projections mentioned above has moreover not proved to bring about any satisfactory results, as a pressing down of the projection in order to try to form a rivet head turns out to be a process that cannot be controlled and can lead to that a bellow is formed instead of riveting. As seen in a manufacturing perspective a riveting process by flanging out an open projection is disadvantageous, as it requires punching holes in the projection and great precision in the riveting operation.
THE SOLUTION
In the solution indicated by means of the invention the plastic sheet is shaped with an embossed projection with a terminating portion closing said projection and which is forming a vaulted termination in outwards direction extending from the transition to the inner tubular portion of the projection. The same is provided with such creasing rules that it can be brought to an at least somewhat inwards folded position, whereby a surface, in order to obtain the secured condition, is placed on said termination and pressed against the same, so it is moved to its inwards folded condition. The vaulted termination is adapted in such a way that it in this position so is widening the portion of the projection located inside of the termination that it forms a rivet head. By means of the invention a method is developed to join parts of blister packages or similar, an excellent joint being achieved by the material itself being utilized for the joint without any extraneous parts being required.
ADVANTAGES
By means of the invention a joint is also obtained that by very simple means can be locked in an automatic operation as well as by hand, and in the latter case practically without the use of any accessory equipment.
The holding device can be designed as a spring lock, which by simple means can be locked in order to produce a fixed joint.
BRIEF DESCRIPTION OF DRAWINGS
An example
REFERENCES:
patent: 2954890 (1960-10-01), Del Valle
patent: 3191564 (1965-06-01), Fraze
patent: 3366267 (1968-01-01), Boyer
patent: 3602980 (1971-09-01), Heffner
patent: 3670405 (1972-06-01), Dochterman
patent: 3812963 (1974-05-01), Zahuranec et al.
patent: 4087019 (1978-05-01), Yamazaki
patent: 4413748 (1983-11-01), Kessler et al.
AB Volvo
Foster Jimmy G.
Lowrance George E.
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