Closure cap with braking structure

Bottles and jars – Closures – Cap type

Patent

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Details

215252, B65D 4104

Patent

active

058847901

ABSTRACT:
A self-braking closure cap for a container, such as a soft drink container, of the type that has a threaded finish portion with at least one raised thread defined thereon includes a top wall portion and a side wall portion having a substantially cylindrical inner surface. The inner surface has at least one raised helically oriented thread defined thereon that has a predetermined pitch. Advantageously, a restrictor is provided for frictionally resisting unscrewing of the closure cap from a container finish portion by bearing primarily against one side of one of the raised threads of the finish portion. Since the braking is achieved by frictional engagement having a significant axial force component, instead of a radial force component, braking can be achieved with a minimum of radial force being exerted on the closure. This preserves the stripping torque value of the closure at an acceptable level without the need to add additional material to reinforce the closure against deformation.

REFERENCES:
patent: 3435978 (1969-04-01), Wittwer
patent: 3610454 (1971-10-01), Malick
patent: 4289248 (1981-09-01), Lynn
patent: 4349116 (1982-09-01), Luenser
patent: 4392055 (1983-07-01), Whitney
patent: 4877144 (1989-10-01), Thanisch
patent: 4948001 (1990-08-01), Magly
patent: 5292002 (1994-03-01), Narin
patent: 5462186 (1995-10-01), Ladina et al.

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