Automotive Door Latch Push-Pull Cable Blocker Pin
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Solution Overview
Problem
Conventional automotive latch assemblies with rod linkages are vulnerable to tampering, allowing unauthorized access as thieves can manipulate the linkages to open the vehicle door using tools, lacking effective resistance to jimmying.
Innovation Solution
A door latch system utilizing flexible push-pull cables with a blocker pin mechanism that prevents unauthorized unlocking by engaging a secondary lever, ensuring the latch remains locked, even when subjected to tampering attempts, and using a slider driven by the cable to secure the lock cylinder, preventing separation and unauthorized actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rod linkages are used for driving the lock/unlock function, then the latch mechanism can be actuated, but the system becomes vulnerable to tampering by thieves who can manipulate the linkages to open the door
Solution Approach 1:
The patent replaces the traditional rod linkage mechanical system with a flexible cable system. The cable runs through a protective conduit and connects the lock cylinder to the latch mechanism, eliminating the exposed rigid linkages that thieves could manipulate. This substitution maintains the lock/unlock functionality while significantly improving security against jimmying attempts.
Solution Approach 2:
The patent introduces a blocker pin as an intermediary component that acts as a security barrier. When the latch is in the locked position, the blocker pin physically prevents the latch lever from being manipulated into the unlocked position. This intermediary element adds an additional layer of protection without compromising the basic lock/unlock operation.
2Reliability
If a blocker pin is added to prevent jimmying, then security is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges the blocker pin function with the existing latch lever structure. The blocker pin is integrated into the latch assembly and works in conjunction with the lever rather than being a completely separate system. This merging approach adds the security function while minimizing the increase in overall device complexity.
Solution Approach 2:
The blocker pin is designed to be dynamic rather than static - it moves into and out of the blocking position based on the latch state. When the latch is locked, the pin engages to prevent manipulation; when unlocked, the pin retracts. This dynamic behavior provides security only when needed without permanently complicating the mechanism's movement.
Data Source
AI summary
A door latch system for an automotive vehicle uses a push-pull cable linked to a lock cylinder and to a latch to move the latch assembly into the locked position while simultaneously blocking the latch's lock/unlock lever from moving into the unlocked position.