Container with auto-opening lid

What is this patent about?

’420 is related to the field of consumer product packaging, specifically focusing on portable containers for moisture-sensitive items like wet tissues. These containers typically employ a spring-loaded lid and a simple latch to allow for one-handed operation; however, such designs are prone to accidental opening during transport or when subjected to external pressure, such as from shrink-wrap packaging or being jostled in a bag.

The underlying idea behind ’420 is a dual-purpose safety mechanism that integrates a sliding lock directly into the primary release button. Rather than just blocking the button's movement, the inventor realized that the locking component should serve as a redundant mechanical bridge. By sliding the lock into position, it simultaneously physically hooks into the lid and braces against the container’s internal frame, creating a rigid assembly that prevents both the button from being depressed and the lid from flexing open.

The claims of ’420 focus on a specific nested assembly where a sliding locking member is housed on the underside of a push-button operation surface. The independent claim requires that this locking member be supported by the operation member so they move together when depressed, while also being slidable through a dedicated guide groove formed within the button's own integrated spring portion. This configuration ensures that the locking member can transition between a state of interference with the container body and a state of free movement.

In practice, the invention works by utilizing the button's internal geometry to manage the lock's travel. The locking member features leg portions that, when slid forward, align with a locking surface on the container body to provide a hard stop against downward pressure. Simultaneously, a locking portion on the slider enters a concave port in the lid. This creates a high-integrity closure that does not rely solely on the small plastic latch pawl, which is often the failure point in traditional designs when the container is squeezed.

This approach differs from prior solutions by consolidating the locking and opening components into a single sub-assembly that can be installed into the container as one unit. By placing the slider behind the button and using a finger-placing portion that extends the lever arm, the design improves mechanical advantage for the user while protecting the internal spring from permanent deformation. This is particularly effective for containers with constricted, ergonomic shapes where external films might otherwise trigger the release mechanism.