Receptacles – Closures – Removable closure retained by ductile in situ deformation
Patent
1989-01-23
1989-12-12
Norton, Donald F.
Receptacles
Closures
Removable closure retained by ductile in situ deformation
206508, 206519, 220380, B65D 4118, B65D 4303
Patent
active
048861847
ABSTRACT:
A plastic container lid is formed by injection molding and comprises a sheet-like main body portion with a downwardly-open hollow upwardly-extending annular projection extending around the periphery of the body portion, the annular projection having an inner wall extending upwardly from the periphery of the body portion, a top wall extending radially outwardly from the top of the inner wall and an outer wall extending downwardly from the outer periphery of the top wall, with the inner and outer walls being substantially equal in height. An annular skirt portion which extends outwardly from the lower end of the outer wall and curves to extend downwardly to a lower annular edge. The skirt portion has an internal annular rib extending around and projecting inwardly from the inner surface of the skirt portion. The internal rib extends inwardly for a distance sufficiently short so as not to reach an imaginary vertical line extending downwardly from a radially outer limit of the outer wall of the upwardly-extending annular projection. Also, the height of the upwardly-extending annular projection above the main body portion is greater than the depth of the skirt portion below the main body portion.
REFERENCES:
patent: 3353708 (1967-11-01), Davis
patent: 3373896 (1968-03-01), Davis
patent: 3519163 (1970-07-01), Bardell
patent: 3880288 (1975-04-01), Hunter
patent: 4407426 (1983-10-01), McLaren et al.
patent: 4817801 (1989-04-01), Schwaikert
Delbridge Robert F.
Fors Arne I.
Hamelin Group Inc.
Norton Donald F.
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