Patent ID: 8316622

Claim:
A cap assembly comprising: an outer cap having hinges extending from a bottom surface of the outer cap to a top of an inner cap, wherein the hinges are vertical inclined projections angled between 45° to 60° from the bottom surface of the outer cap which form an arc-like shape around the bottom surface of the outer cap positioned every 90 degrees; wherein the hinges provide a distance D 1 between the outer cap and inner cap in a resting position; inner cap teeth extending in a vertical direction along an outer periphery of the inner cap; outer cap teeth extending in a vertical direction along an inside of the outer cap inner periphery wall; wherein a ratio of the inner cap teeth to outer cap teeth is 2:1; wherein the inner cap teeth and outer cap teeth have angled edges; wherein the distance D 1 is about 3 mm between the bottom surface of the outer cap and the top surface of the inner cap and the distance D 1 is reduced to distance D 2 which is about 1 mm when a pressure is exerted on the cap assembly compressing all of the hinges in an engagement position which engage the inner cap teeth and outer cap teeth.