Safety Lock with Coded Key and Asymmetric Notches

The patent applies asymmetry by using two different types of notches on the driver: simple notches and slotted notches. The first key engages with simple notches while the second key engages with slotted notches. This asymmetric design allows each key to perform its specific function (blocking rotation in opposite directions) while maintaining a manageable number of parts. The asymmetry in notch design enables the locking mechanism to achieve bidirectional security without requiring identical complex structures for both keys.

The patent segments the locking function into two distinct mechanisms: simple notches for one direction and slotted notches for the opposite direction. Each key type is designed specifically for its corresponding notch type. This segmentation allows for specialized, optimized manufacturing processes for each component type, reducing overall complexity compared to creating two identical complex slotted-key systems. The segmentation principle enables cost-effective production by allowing standardization within each key/notch pair while maintaining security through functional differentiation.

The patent applies universality by making both keys identical in structure and mounting them diametrically opposite on the cylinder. Each key performs multiple functions: it blocks rotation in one direction when engaged in simple notches, and can be engaged in slotted notches by the corresponding second key to block rotation in the opposite direction. This universal design reduces the number of different parts to two identical keys and their mounting mechanisms, simplifying manufacturing and inventory management while maintaining effective bidirectional locking through coordinated operation of the symmetric key pair.