Plastic closure with structural thread formation

Details Plastic closure with structural thread formation Plastic closure with structural thread formation

1986-03-20

1987-06-23

Norton, Donald F.

Bottles and jars

Closures

Frangible member or portion

215307, 215329, B65D 4134

Patent

active

046746439

ABSTRACT:
A plastic closure for use on a container having an externally threaded neck is disclosed wherein the skirt portion of the closure cap includes an internal structural thread formation. The structural thread formation comprises a helical thread ramp portion which is configured for load-bearing engagement with the thread of the associated container, and further includes means for reinforcing the thread ramp portion, in the form of a plurality of spaced-apart reinforcing gussets. The provision of the structural thread formation desirably facilitates high-speed molding of the closure, and desirably acts to reduce the quantity of plastic material required for molding the closure.

REFERENCES:
patent: 3893583 (1975-07-01), McLaren
patent: 4343754 (1982-08-01), Wilde et al.
patent: 4378893 (1983-04-01), Wilde et al.
patent: 4407422 (1983-10-01), Wilde et al.
patent: 4476987 (1984-10-01), Nolan
patent: 4497765 (1985-02-01), Wilde et al.

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