Receptacles – End wall structure – Joint or seam between sidewall and end wall
Patent
1997-04-09
1998-06-16
Moy, Joseph M.
Receptacles
End wall structure
Joint or seam between sidewall and end wall
220614, B65D 600
Patent
active
057657149
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lid mounting structure for a pressure vessel, and more particularly, to a lid mounting structure capable of preventing a lid of a pressure vessel, such as an aerosol container, from being blown away by an abnormal rise of the internal pressure.
BACKGROUND ART
A general type of aerosol dispensing container has an opening at an upper end of a dome mounted on a body or an upper end of a shoulder portion formed with the body, and a valve is mounted on the opening. The valve is attached to the body by forming a curled portion directing out side at a periphery of the opening, capping a mounting cap with a valve on the curled portion with sandwiching a gasket between the curled portion and the mounting cap, and crimping or clinching a side wall of the mounting cap to the under side of the curled portion.
When such a aerosol container is left in a high temperature atmosphere such as in an automobile in summer, the internal pressure rises abnormally. Then, the container body tends to accidentally break at a seam or the like, or the mounting cap is accidentally blown away from the vessel body. Further, when the container is thrown into an incinerator without letting the internal gas out, a similar accident may happen.
In order to prevent such accident, there has been hitherto proposed such an aerosol container having a body with a through hole and a plug tightly inserted in the hole. The plug is made of a metal with low fusing point, so that the plug will fuse under high temperature to let the internal gas escape (see Japanese Examined Patent Publication No. 25610/1976). Further, it can be considered to provide a pressure relieve valve to a bottom of the container body.
The former is effective when the container is thrown into an incinerator. However, since the plug does not fuse at the temperature in an automobile, 70.degree. to 80.degree. C. for example, the valve cannot be prevented from being blown away. As the latter case, the relieving pressure can be freely set up, and the container can use continuously after the internal gas escapes. However, such aerosol container is high in cost, and does not be used for practical use.
On the other hand, there is known such type of aerosol device that has a container body made of synthetic resin or glass, and a cap-like mounting cap capped on an opening of the body, in which a lower end of the cap is engaged and fixed to a flange formed at the rim of the opening of the container. In such type of the aerosol device, there was proposed a device capable of preventing from explosion by changing strength of the mounting cap and forming a gas-escaping-hole (see Japanese Examined Patent Publication No.85431/1993). However, the device can be applied to only an aerosol device having a specific type of mounting cap.
An object of the present invention is to delete the problem that a lid is blown away in a pressure vessel in which a specific lid member such as a known mounting cap or the like is used. That is to say, an object of the present invention is to provide a lid mounting structure for a pressure vessel which can prevent a lid member from being blown away by a rise of the internal pressure, further by which the pressure vessel can be continuously used after the inner pressure falls down, and which can be manufactured with low cost.
The inventors have performed much reappearance tests of the blowout accident of an aerosol container. Further, various devices including the above-mentioned propositions were tested under various conditions. However, any mechanism which perfectly functions cannot be obtained. That is to say, even if a prototype or trial model was able to prevent a lid from being blown away, blowout accidents had happen at a rate when many containers were really manufactured and tested as a production test.
The inventors thought that the failure of those mechanisms was caused by fall of reliability of the container due to addition of various structures to the existing aerosol container. And the inventors consider
REFERENCES:
patent: 2643914 (1953-06-01), Reswick
patent: 3367533 (1968-02-01), Baker
patent: 3550832 (1970-12-01), Fitzgerald
patent: 4597502 (1986-07-01), Troughton
patent: 4813576 (1989-03-01), Greenebaum, II
patent: 5178297 (1993-01-01), Harold
Mekata Satoshi
Nakano Takashi
Okabayashi Tamao
Moy Joseph M.
Osaka Shipbuilding Co., Ltd.
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