Closure lip seal relief

摘要

A closure comprises a hub with a central opening and a head pivotally connected to the hub, the head sealing the central opening when in a closed position. A lip seal relief is defined by a stepped surface between the head and the hub so that when the head is closed, the relief or clearance is provided between the head and hub inhibiting damage to a seal.

主权项

1. A closure lip seal relief, comprising:
a hub having a peripheral body and a central opening of circular shape; a head movable into and out of said hub to close or open said closure, respectively; said head having an outer peripheral edge, an inwardly facing surface and an outwardly facing surface; a seal groove located along said inwardly facing surface of said head and adjacent said outer peripheral edge, said groove having a radially inner end and a radially outer end, each of said inner end and said outer end positioned opposite an opposed facing surface of said hub; a seal disposed within said seal groove and engaging said opposed facing surface of said hub; a step located along one of said head and said hub, said step being adjacent to said groove when said head is moved into said hub to close said closure; wherein a clearance is created between said hub and said head, said seal at least partially located within said clearance so that said seal is not engaging said opposed facing surface prior to pressurization within said hub, and said seal engages said opposed facing surface after said pressurization of said hub.