| 摘要 |
A screw type load bearing closure having a relatively flexible outer cap and a relatively rigid inner cap nested together. The caps are provided with complementary engaging ribs and lugs making it possible to turn the caps as a unit in a closing direction but permits relative rotation of the caps upon rotation of the outer cap in an opening direction unless the outer cap is simultaneously deflected axially relative to the inner cap. Complementary load bearing surfaces are provided on the caps to prevent axial deflection when the caps are in a predetermined position to prevent axial deflection and possible permanent set of the outer cap relative to the inner cap.
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