Receptacles – Outlet or junction box type – Sectional receptacle
Patent
1981-08-10
1984-01-03
Gilden, Leon
Receptacles
Outlet or junction box type
Sectional receptacle
156203, 156218, 220 80, 413 1, 413 69, B65D 2514
Patent
active
044238231
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to containers of the kind having a plurality of components at least one of which is of laminar metallic material, the container having at least one seam securing an edge portion of a said laminar metallic component to an overlapping edge portion of a component of the container. Such a container will be called herein "a container of the kind specified". Examples of such seams are the double seam by which a metal can end member is seamed to a metal can body; the swaged seam whereby the valve cup of an aerosol dispensing container (hereinafter referred to as an aerosol can) is seamed to the remainder of the container; and a longitudinal side seam of a built-up metal can body.
BACKGROUND ART
One example of a container of the kind specified is a can of the so-called "open-top" kind, i.e. a can comprising a can body which by itself has an open top end, but which has this end closed by a can end member secured to the can body by means of a peripheral double seam. Another example is an aerosol can in which the top end of the cylindrical can body is closed by a domed or generally cone-shaped cover member having an aperture which is itself closed by a cup carrying the aerosol dispensing valve. The cup is usually swaged on to the cover member. In the case of the aerosol can, this invention may also provide benefits in the joint between the cover member and the can body.
As far as open-top cans are concerned, it has for many years been conventional practice to stamp a can end member from a sheet of metal which has been pre-lacquered for subsequent protection of the metal, or of the eventual contents of the can, or both, and to apply a suitable sealing compound to a peripheral flange of the can end member. Following this, the end member is positioned over an open end of the sheet metal can body, which is also pre-lacquered, with the peripheral flange of the end member overlying a peripheral flange of the body. The two flanges are then deformed together to produce a double seam.
This process has a number of disadvantages. Firstly, during the seaming operation there is a danger that the lacquer may be damaged on either the can end member or the can body as a result of local high pressure between the end member and the body, or friction between one of these parts and the seaming tools. If the lacquer is damaged there follows a risk of corrosion of the metal and of contamination of the contents of the can. Another problem is that the sealing compound is occasionally squeezed out during formation of the double seam and this again may have a detrimental effect on the quality of the seal provided by the seam and on the eventual contents of the can.
Turning to aerosol cans, the same problems may also occur when the cover member is joined to the can body. Both of these parts may be lacquered prior to being joined together, and, as in the case of an open top can end member, a peripheral flange of the aerosol can cover member is lined with a suitable sealing compound. In this case, if the lacquer on an internal surface is damaged whilst the cover member is being secured to the can body, there is a considerable risk of internal rusting if the aerosol formulation to be contained by the can includes water. Additionally, if sealing compound is squeezed into the interior of the can body whilst the cover member is being secured to the latter, and particles of the compound become dislodged, they may eventually, in use, block the aerosol dispensing valve.
Similar problems may occur when the cup is swaged on to the cover member. The cup normally has a peripheral flange carrying a sealing compound.
The sealing compound is typically a gasket of a suitable latex preparation, which is applied by "flowing-in". For example, the gasket on the valve cup of an aerosol can is typically applied as a water-based suspension in sufficient quantities to give a final dry weight of 570 mg., corresponding to a dry thickness which at the thickest cross-section of the gasket is in the approximate range 0.50 to 0.65
REFERENCES:
patent: 3036728 (1962-05-01), Gibb
patent: 3618817 (1971-11-01), Troughton
patent: 3669816 (1972-06-01), Smith et al.
patent: 3898945 (1975-08-01), Rohowetz
patent: 3906126 (1975-09-01), Kaiser
patent: 3921847 (1975-11-01), Rentmeester
patent: 4003492 (1977-01-01), Beveridge
patent: 4034132 (1977-07-01), Manuel
patent: 4065023 (1977-12-01), Rentmeester
patent: 4293353 (1981-10-01), Pelton
Franek Josef T.
Porucznik Paul
Serby Peter H.
Tod Christopher J. N.
Gilden Leon
Metal Box Limited
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