Passive Wing Lock Link Device Tamper Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door locking mechanisms lack effective tamper protection against external pressure, allowing locking rods to be retracted improperly, which compromises security and functionality.
Innovation Solution
A passive wing lock device with a tamper protection system that utilizes a link device and blocking elements, connected to the lock gear, to prevent retraction of locking rods by applying pressure, ensuring secure locking and unlocking operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking bar connecting device is directly connected to the lock gear, then the structure is simple and easy to manufacture, but the locking mechanism is vulnerable to tamper attacks where external pressure can retract the locking bars
Solution Approach 1:
The patent introduces a link device as an intermediary between the locking bar connecting device and the lock gear. This link device includes a link guide slot and link pin that mediate the force transmission, allowing the blocking mechanism to intercept tamper forces before they reach the lock gear, while still permitting normal actuation forces to pass through.
Solution Approach 2:
The patent segments the force transmission path by dividing it into distinct functional components: the locking bar connecting device, the link device with blocking mechanism, and the lock gear. This segmentation allows the blocking mechanism to independently intercept harmful forces while maintaining the overall locking function.
2Reliability
If a blocking mechanism is added to prevent tamper attacks, then security is improved, but the device complexity and number of components increases
Solution Approach 1:
The patent merges the blocking mechanism functionality into the existing link device that connects the locking bar to the lock gear. The link guide slot and link pin are integrated components that serve both the normal actuation function and the tamper blocking function, rather than adding completely separate blocking components.
Solution Approach 2:
The link device with its guide slot and pin serves multiple functions: it transmits actuation forces from the lock gear to the locking bar during normal operation, and simultaneously acts as a blocking mechanism to intercept tamper forces. This multi-functionality reduces the need for additional dedicated blocking components.
3Reliability
If the link pin is blocked in the link guide slot during manipulation, then tamper protection is achieved, but the ease of operation for legitimate unlocking is reduced
Solution Approach 1:
The link pin's position within the link guide slot is dynamic rather than fixed. During legitimate unlocking operations, the pin can move freely along the slot to accommodate the necessary movement of the locking bar. During tamper attacks, the blocking mechanism intercepts the pin at specific positions in the slot, dynamically responding to the nature of the applied force.
Solution Approach 2:
The link guide slot has different functional zones: certain portions of the slot allow free movement of the link pin during normal operation, while other portions are designed to be blocked by the tamper protection mechanism. This local differentiation in the slot's geometry enables both ease of legitimate operation and effective tamper protection.
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The passive wing locking device has a lock mechanism and a lock actuator, where the lock mechanism has an upper locking bar connecting device of an upper locking bar that is guided in or on the passive wing and a lower locking bar connecting device of a lower locking bar that is guided in or on the passive wing. The upper locking bar connecting device is connected with a lock gear by a link device (39k). The link device has a link guide slot and a link pin, which is blocked in a catch section of the link guide slot in case of manipulation.