US Patent 9321564 Mechanically secured lid and container

A storage container has a base having an opening and a lid for covering the opening. A lock ring is mounted on one of the base and the lid for motion between a first position and a second position. At least one lock member is formed on the lock ring. At least one stationary lock member is formed on the other one of the base and the lid. The lock member is aligned with the stationary lock member when the lock ring is in the first position such that the lock member engages the stationary lock member. The lock member is offset with respect to the stationary lock member when the lock ring is in the second position such that the lock member does not engage the stationary lock member.