Abstract: The present invention relates generally to a child-restraint combination of a container and a one-piece closure. The interior surface of the closure has one type-A lug, and a plurality of type-B lugs. The exterior surface of the container has one type-A groove, and a plurality of type-B grooves. If the user aligns the two side lines, one on the container and one on the closure, before lifting the closure away from the container, then the type-A lug is lifted into the type-A groove, and the closure can be removed very easily from the container. If the user lifts the closure without aligning the two side lines first, then the type-A lug is lifted into one of the type-B grooves, causing the container and the closure interlock, making it impossible to rotate or to lift the closure away from the container.

Abstract: This invention provides a new and simple tamper-resistant, safety closure for a container having threaded neck. It requires the user to align the two arrows, then give it an upward lift while turning in the counter-clockwise direction to unscrew it from the container.Features of the invention useful in accomplishing the above objects include an outer cap and an inner cap. The interior surface of the outer cap has a plurality of identical protrusions, called the type A protrusions, and one type B protrusion. The exterior surface of the inner cap has a plurality of identical grooves, called the type A grooves, and one type B groove. If the type B protrusion is lifted into the type B groove, then the two caps inter-lock and turning the outer cap in the counter-clockwise direction would also turn the inner cap in the same direction, resulting in the unscrewing of the closure from the container.