Positional Multiplex Keyway System for Hierarchical Lock Extension
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Solution Overview
Problem
Current multiplex keyway systems face limitations in expanding the number of unique lock-and-key combinations, as existing methods either lead to 'weak' master keys or unreliable lock operation when trying to extend simplex or multiplex hierarchies.
Innovation Solution
A positional multiplex keyway system where a base-level key can enter a different keyway but is elevated, preventing operation by lifting pin stacks beyond the shear line, and a new keyway design with a narrowed foot prevents old keys from fully entering, while a specially configured key with a projection allows proper alignment for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing multiplex keyway systems are used to expand the number of unique lock-and-key combinations, then the number of combinations increases, but the system produces 'weak' master keys or unreliable lock operation
Solution Approach 1:
The patent introduces a vertical dimension to key positioning by adding a projection element that extends downward from the key base. This projection engages with a foot portion in the keyway, establishing a precise vertical reference plane. This dimensional addition allows the key to be positioned at the correct height to reliably lift pin stacks to the shear line, resolving the unreliability issue while enabling expansion of keyway hierarchies.
Solution Approach 2:
The foot portion in the keyway acts as an intermediary element between the key and the pin stacks. It receives the key's projection and translates this engagement into proper vertical positioning of the key relative to the pin stacks. This intermediary mechanism ensures consistent, reliable key positioning that enables dependable lock operation across expanded multiplex hierarchies.
2Adaptability or versatility
If a base-level key is allowed to enter a different keyway, then the number of keyway families can be extended, but the key may operate locks it should not
Solution Approach 1:
The patent uses the vertical dimension created by the projection-foot engagement to control key positioning. When a base-level key enters a different keyway, the projection engages the foot portion, elevating the key to a specific height where the bitting patterns do not align with the pin stack discontinuities. This vertical displacement prevents unauthorized operation while allowing the key to enter the keyway, enabling safe expansion of keyway families.
3Adaptability or versatility
If traditional multiplex keyway systems are used, then some key combinations can be shared, but the system cannot be easily extended to additional families
Solution Approach 1:
The patent segments the keyway structure into distinct functional portions: the foot portion that receives the projection, the core section with blocking elements, and the bitting reception area. This segmentation allows independent design and configuration of each portion, enabling systematic extension to additional keyway families without redesigning the entire system. The modular structure reduces overall complexity while enabling expansion.
Solution Approach 2:
The foot portion and projection mechanism serve multiple functions: they establish vertical positioning reference, prevent key rotation, and enable differentiation between key families. This multi-functional design allows the same basic structure to be used across multiple keyway families, reducing the need for entirely different mechanisms for each family and simplifying system extension.
Data Source
AI summary
A method and apparatus for extending an existing simplex or multiplex lock-and-key system that includes a family of first keys each having a first profile and of a corresponding plurality of first locks each operable by a first key and each having a first keyway configured for accepting the first key profile. Second keys of a new family are defined with a core section corresponding to the first key profile and a narrowed projection extending from the bottom of the core section. Corresponding second locks have a second keyway profile defined as the compliment of the second key profile, thus including a complimentary core section and a foot recess extending from the bottom of the second keyway core section. The second locks accept a second key positioned at the second keyway baseline to normally lift the lock pin stacks and operate the second lock. The second locks also accept the first keys but the first keys cannot enter the narrowed foot recess of the second keyway and are accordingly elevated in the second keyway above the keyway baseline, and are therefore unable to normally lift the lock pin stacks to operate the second lock.