Double-Cylinder Lock Clutch for Single Service-Key Actuation
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Solution Overview
Problem
Existing double cylinder locks do not allow a single actuation of the service cylinder between two actuations of the customer cylinder, making it difficult for postmen to open mailboxes securely and vulnerable to unauthorized access by thieves.
Innovation Solution
A double cylinder lock design where the service cylinder can only be actuated once between two actuations of the customer cylinder, featuring a movable clutch and specific notches and orifices to ensure secure operation, allowing only the owner to access the mailbox after a parcel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the service cylinder is made operable multiple times between customer cylinder actuations, then ease of operation for delivery personnel is improved, but security against unauthorized access deteriorates
Solution Approach 1:
The clutch is designed to dynamically change its state between engaged and disengaged positions based on the actuation sequence. After the service cylinder is actuated once, the clutch automatically engages to prevent further service cylinder actuations, while the customer cylinder remains operable. This dynamic state change resolves the contradiction by adapting the lock's operational characteristics based on usage patterns.
Solution Approach 2:
The clutch acts as an intermediary mechanism between the service and customer cylinders. It mediates the interaction between the two cylinders by selectively enabling or disabling service cylinder actuation based on whether it has been actuated once already. This intermediary component allows the system to enforce security rules without directly modifying the customer cylinder's operation.
2Productivity
If the service cylinder allows unlimited actuations, then productivity of delivery personnel is improved, but vulnerability to theft increases
Solution Approach 1:
The lock system performs a preliminary action by recording whether the service cylinder has been actuated once, and based on this preliminary state, it prevents further service cylinder actuations. This preliminary recording action is stored in the clutch's position, which remembers whether the service cylinder was actuated and locks that state until the customer cylinder is actuated again.
3Reliability
If a single actuation limit is imposed on the service cylinder, then security is improved, but ease of operation for legitimate users deteriorates
Solution Approach 1:
The clutch serves multiple functions: it limits service cylinder actuations to once, enables customer cylinder operation, and automatically resets when the customer cylinder is actuated. This multi-functionality resolves the contradiction by making a single component responsible for both security enforcement and operational convenience, ensuring that legitimate users experience no operational barriers.
4Reliability
If the clutch mechanism is added to enforce single actuation, then security is improved, but device complexity increases
Solution Approach 1:
The clutch mechanism is merged with the existing dual-cylinder lock structure, sharing common components such as the tube, spring, and notches. The clutch integrates with the service and customer cylinders through shared mounting structures and operational sequences, reducing overall system complexity compared to having separate independent mechanisms for each cylinder.
Data Source
AI summary
The invention relates to a lock (100) with a double cylinder (60; 70), the first of said cylinders, called service cylinder (60), being operable by a first key, the second of said cylinders, called customer cylinder ( 70), being operable by a second key distinct from the first key, characterized in that between two actuations of the customer cylinder, the service cylinder can only be actuated once at most.