Valve plates for container valves and method of manufacturing sa

Details Valve plates for container valves and method of manufacturing sa Valve plates for container valves and method of manufacturing sa

1984-05-10

1985-05-07

Pollard, Steven M.

Receptacles

Closures

Removable closure guided in rotary movement

220361, 220362, 220 66, 220 5R, 29512, B21D 3900, B65D 5120

Patent

active

045152853

ABSTRACT:
A valve plate is manufactured by stamping round two-ply blanks out of two superimposed strips of material and shaping the valve plate out of the blanks while retaining the double ply. The plate is provided with a dome by this process. The outer ply is now provided with threading in the vicinity of the dome. If the plate is damaged when an adaptor is subsequently screwed onto it, the damage will be confined to the outer layer.

REFERENCES:
patent: 1963797 (1934-06-01), Mills
patent: 2031838 (1936-02-01), Leonhart
patent: 2210353 (1940-08-01), Barnes
patent: 2291706 (1942-08-01), Frease
patent: 2308089 (1943-01-01), McClary
patent: 2352251 (1944-06-01), Calleson et al.
patent: 3124267 (1964-03-01), Cetrone
patent: 4316318 (1982-02-01), Mineo

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