Screw closure for bottles with venting means

Details Screw closure for bottles with venting means Screw closure for bottles with venting means

1989-11-21

1991-03-05

Marcus, Stephen

Bottles and jars

Closures

Receptacle interior communicable with exterior with closure...

215260, 215310, B65D 5116

Patent

active

049970976

ABSTRACT:
The invention relates to a screw closure of plastics material for bottles which are under pressure, comprising a cap (1) having a cap end portion (2) and a substantially cylindrical peripheral cap portion (3) with internal screwthread (7), and a circumferentially extending, inwardly projecting bead (5) at the transition between the cap end portion (2) and the peripheral cap portion (3), wherein a sealing disc (9) which is movable relative to the cap bears against the inward side of the cap end portion (2) and the projecting bead (5). In order, in regard to such a pressure-tight closure, to limit the maximum pressure up to which the closure remains pressure-tight, to a value which is noticeably below the pressure at which a bottle explodes, it is proposed in accordance with the invention that the bead has a segment-like interruption.

REFERENCES:
patent: 3966071 (1976-06-01), Northup
patent: 4007848 (1976-02-01), Snyder
patent: 4121728 (1978-10-01), Tagalakis et al.
patent: 4427126 (1984-01-01), Ostrowsky
patent: 4738370 (1988-04-01), Urmston et al.
patent: 4747502 (1988-05-01), Luenser

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