Self-swinging key reminder and storage system, attached to the outside of the door and retractable when closing, with time-delayed acoustic or verbal reminder to prevent lockouts and key loss in living spaces.

Abstract

A self-swinging key reminder and storage system consisting of a hollow body ("butler") attached to the doorknob via a flexible band (10-20 cm). The hollow body hangs from the door, and gravity, combined with a weight-reinforced section at its base, keeps it in a stable resting position outside the door. When the door is opened, the hollow body swings outwards to release the key. When the door is closed, the user pulls the key back inwards, where it remains. The system operates entirely mechanically, requiring no electrical energy for its basic function.

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