Combination Lock Code Change Mechanism
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Solution Overview
Problem
Conventional combination locks can have their authorized combinations learned by unauthorized users, leading to security issues when access is no longer desired, and existing code change mechanisms can be inconvenient and prone to unintended changes.
Innovation Solution
A combination locking mechanism that includes a dial, tumbler discs, and a code change mechanism, allowing for secure reorientation of the dial with respect to the tumbler discs using a key-operated code change mechanism, eliminating the need for a separate code change button and preventing inadvertent changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional button-operated code change mechanism is used, then the combination can be changed, but the mechanism is prone to unintended changes and requires opening the locker door
Solution Approach 1:
A clutch mechanism serves as an intermediary between the dial and the first tumbler disc, allowing selective engagement and disengagement. This mediator enables controlled code changes by separating the dial's rotational input from the tumbler disc during code change operations, preventing unintended changes while maintaining ease of operation
Solution Approach 2:
The system transitions from a static connected state (dial permanently engaged with tumbler disc) to a dynamic selectively engaged state (dial engageable or disengageable from tumbler disc via clutch). This dynamic capability allows the code change mechanism to adapt between normal operation mode and code change mode, resolving the contradiction between convenience and accuracy
2Reliability
If the dial is permanently engaged with the tumbler disc, then normal unlocking operation is reliable, but code changing requires opening the locker door and is inconvenient
Solution Approach 1:
The connection between the dial and tumbler disc is segmented into two independent states: engaged state for reliable unlocking operation and disengaged state for convenient code changing. The clutch mechanism enables this segmentation, allowing the dial to be separated from the tumbler disc when code change is needed, eliminating the requirement to open the locker door
Solution Approach 2:
The dial assembly is given multi-functionality by enabling it to serve two purposes: normal unlocking operation (when engaged with tumbler disc) and code changing operation (when disengaged from tumbler disc). This universal design allows a single component to perform multiple functions without requiring separate mechanisms, improving ease of operation while maintaining reliability
3Reliability
If a key-operated code change mechanism is implemented, then inadvertent code changes are prevented, but the mechanism complexity increases
Solution Approach 1:
The key-operated code change mechanism merges the key cylinder operation with the clutch engagement/disengagement function. The same key rotation that operates the locking mechanism also controls the clutch state, combining multiple functions into a single operational sequence. This integration prevents inadvertent code changes while minimizing the increase in overall mechanism complexity
Data Source
AI summary
A combination locking arrangement includes a locking member, at least first and second tumbler discs, a dial, and a code change mechanism. When each of the tumbler discs is rotated to an unlocking orientation, the locking member is movable from a locking position to a releasing position. The dial is rotatable about a tumbler disc axis for selective rotation of the at least first and second tumbler discs. The dial includes a clutch rotationally securable in interlocking engagement with the first tumbler disc. The code change mechanism is rotatable to a code change position to separate the clutch from the first tumbler disc, such that the dial is subsequently rotatable to rotate the clutch with respect to the first tumbler disc.