Sidebit Interchangeable Core Control Lug Retention Mechanism
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Solution Overview
Problem
Traditional pin tumbler lock mechanisms in interchangeable lock cylinders have limitations due to a finite number of bitting combinations, compatibility issues with different key configurations, and mechanical constraints, which restrict the compatibility and security of lock operations.
Innovation Solution
A retention mechanism featuring a control lug, finger pin, and control pin that allows rotational displacement and secure placement within a lock housing, enabling the lock cylinder to be retained or removed based on specific key configurations, thereby enhancing compatibility and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pin tumbler lock mechanisms are used with a finite number of bitting combinations, then the lock mechanism is simple and manufacturable, but the number of usable bitting combinations is limited and reduces security
Solution Approach 1:
The patent introduces a dynamic retention mechanism where the control lug can rotate between engaged and disengaged positions based on key insertion. This dynamic positioning allows the same physical cylinder to function with different bitting configurations, effectively increasing the number of usable keys without adding physical variants of the cylinder.
Solution Approach 2:
The control lug serves multiple functions: it retains the cylinder in the lock housing during normal operation, enables removal when needed, and works with multiple different key bitting configurations. This multi-functionality allows a single cylinder design to support expanded key compatibility while maintaining security.
2Reliability
If the control lug is retained in the lock housing to prevent removal, then the lock cylinder is secure, but the cylinder cannot be removed for replacement or maintenance
Solution Approach 1:
The retention mechanism is designed to automatically engage the control lug in the engaged position during normal lock operation, preliminarily securing the cylinder without requiring continuous manual intervention. The mechanism allows controlled disengagement when a proper removal key is inserted, providing both security and maintenance capability.
Solution Approach 2:
The control lug acts as an intermediary element between the lock housing and the cylinder retention system. It mediates between the need for secure retention during operation and the need for controlled removal during maintenance, translating key insertion actions into appropriate retention states.
3Reliability
If different bitting configurations are used for control activation and cylinder removal, then the lock mechanism provides enhanced security, but the complexity of the key system increases
Solution Approach 1:
The key system is segmented into functional components: operating keys with first bitting configurations for cylinder operation, control keys with second bitting configurations for cylinder removal, and master keys with third bitting configurations for both functions. This segmentation allows each key type to have optimized bitting while maintaining overall system security.
Solution Approach 2:
The patent implements a key system with more bitting configurations than traditionally required. By providing multiple distinct bitting patterns (first, second, and third configurations) that can be selectively applied to different keys, the system achieves enhanced security through excessive key variety rather than minimal necessary variation.
Data Source
AI summary
A retention mechanism for retaining a lock cylinder in a lock housing. The retention mechanism includes a control lug, a control pin, and a finger pin. A portion of the control lug is configured to be positioned in a retention recess of the lock housing when the control lug is in an engagement position to prevent the removal of the lock cylinder from the lock housing. With the control lug in the engaged position, at least a portion of the control pin may be biased into a chamber of the control lug to retain the control lug at the engaged position. When the control lug is to be displaced from the engaged position, the finger pin may be lifted to an activation position, such as by a sidebit of a key, wherein the finger pin may removably displace the control pin from at least a portion of the chamber.