Lock Code Change Without Demounting Using Key Override
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Solution Overview
Problem
Existing combination locks require demounting for user-change of the selected group of effective buttons, which is inconvenient and often necessitates specialist assistance, compromising security and ease of use.
Innovation Solution
A lock design allowing user-change of the selected group of operating elements without demounting, utilizing a cancelling mechanism accessible externally, which can override blocking means to change the rotational settings of the buttons, ensuring secure and convenient code modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the panel is removed to allow user change of the selected group of buttons, then the buttons can be repositioned to change the code, but the lock must be removed from the door which is laborious and compromises security
Solution Approach 1:
The lock is divided into separable components: the housing containing the locking mechanism and the button assembly. The blocking means is segmented into a fixed portion in the housing and a movable portion associated with the buttons, allowing independent manipulation of the button settings without removing the entire lock from the door.
Solution Approach 2:
A key-operated cancelling means acts as an intermediary to temporarily disable the blocking means, enabling button repositioning. The key provides secure authorization while the blocking means is cancelled, allowing code changes without demounting the lock.
2Adaptability or versatility
If the panel is removed to allow button repositioning, then code change is enabled, but specialist assistance and tools are required which increases cost and complexity
Solution Approach 1:
The lock enables users to perform code changes themselves through the key-operated cancelling means and button repositioning mechanism. The design eliminates the need for specialist assistance or tools by providing all necessary functions within the lock itself, making the system self-sufficient for user maintenance and reconfiguration.
3Ease of operation
If buttons are made manipulable for code change, then user flexibility is improved, but security against unauthorized tampering is reduced
Solution Approach 1:
The blocking means is engaged by default to prevent unauthorized manipulation of the buttons. The key-operated cancelling means provides a preliminary security check before allowing button repositioning, ensuring that only authorized users can change the code while maintaining security against tampering.
Data Source
AI summary
A lock comprises a housing defining a mounting face, a locking mechanism accommodated in the housing and operable to change between a locking state and a release state and a set of operating elements with buttons accessible at the front of the housing and actuable, such as by axial displacement, to operate the locking mechanism. The locking mechanism can be changed from the locking state to the release state in response to actuation of, and only of, a selected group of the operating elements. These elements can additionally be manipulated, in particular rotated, to select the group. The buttons of the selected group can be identified by respectively associated digits forming a code. The lock further comprises a slidable blocking plate blocking the rotation of the operating elements and cancelling means operable to cancel the blocking by the plate. The cancelling means includes a key barrel accessible for operation externally of the housing at a place, in particular the front of the housing, separate from the mounting face. Operation of the key barrel thus has the consequence of freeing the buttons for rotation to change the code.