Security Lock Gearing Mechanism Prevents Bolt Block Pivoting
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Solution Overview
Problem
Conventional security locks with bolt blocks can be compromised by targeted shaking, allowing the lock bolt to be opened inadvertently.
Innovation Solution
A gearing mechanism is introduced between the bolt block and the electric drive, featuring a driving and blocking member with a recess and a stationary peg, which ensures the bolt block is securely locked in place, and an emergency release mechanism via a blocking slide for manual operation if the electric drive fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bolt block is used to block the lock bolt movement, then the lock security is improved, but the bolt block can be released by targeted shaking which compromises the security
Solution Approach 1:
A driving and blocking member is introduced as an intermediary element between the bolt block and the electric drive. This member includes a blocking face that interacts with a stationary stop face to prevent the bolt block from being pivoted back by shaking, while still allowing controlled movement during normal operation
Solution Approach 2:
The driving and blocking member is positioned and configured to preemptively counteract the harmful effect of shaking before it can release the bolt block. The blocking face engages with the stop face to create preliminary resistance against unauthorized movement
2Extent of automation
If the electric drive is used to operate the bolt block, then automation is improved, but the system becomes vulnerable to electric drive failure
Solution Approach 1:
The system allows for a change in the operational state of the bolt block from electrically actuated to manually operable when the electric drive fails. The manually operated drive can directly move the lock bolt and interact with the blocking mechanism to change the system's operational parameters
Solution Approach 2:
A blocking slide is provided as a preliminary measure to ensure that even if the electric drive fails, the locking function remains intact. The blocking slide can be manually operated to maintain the blocked position of the bolt block, cushioning against the potential failure mode
3Reliability
If the driving and blocking member is positioned with a smaller radius, then the blocking effectiveness is improved, but the force transmission efficiency decreases
Solution Approach 1:
The driving and blocking member is designed with asymmetric positioning where the blocking face is located at a smaller radius from the pivot axis compared to the articulation point of the electric drive. This asymmetric configuration optimizes the blocking effectiveness while the larger radius at the drive connection maintains force transmission efficiency
Data Source
AI summary
A security lock has a lock bolt that can be moved from an open position into a closed position and vice versa. A manually operated drive is provided to operate the lock bolt. Movement of the lock bolt is blocked in a blocked position by a bolt block. A gearing mechanism is arranged between the bolt block and an electric drive for moving the bolt block from a release position into a block position, and for blocking the bolt block against pivoting in the block position. The gearing mechanism ensures that, starting from a release position, the bolt block is first moved into a block position, and then the bolt block is blocked against pivoting in the opposite direction by continued running of the electric drive. The electric drive can be reversed to remove the block against the bolt block and to move the bolt block into the release position.