Magnetic Latch Preventer for Vehicle Door Security
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Solution Overview
Problem
Conventional vehicle door locks can be vulnerable to tampering, as thieves can use tools to move the latch movement preventing member out of the path of the latch, allowing unauthorized access.
Innovation Solution
A magnetically actuated latch movement preventing member is used, where a pair of permanent magnets with like poles creates a repulsive force to move the member from a retracted position to an extended position, blocking the latch's rotation and enhancing security without increasing cost or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spring mechanism is used to move the latch movement preventing member, then the lock can prevent unauthorized access, but the operation is less smooth and reliable
Solution Approach 1:
The patent replaces the conventional spring-based mechanical system with a magnetic field-based system. Two permanent magnets (one on the piston, one on the cam linkage) create magnetic attraction/repulsion forces that smoothly move the latch movement preventing member into or out of the latch's path, eliminating the need for complex spring mechanisms while improving operational reliability and smoothness
2Reliability
If the latch movement preventing member is positioned to block the latch, then security is enhanced, but the operation becomes less smooth
Solution Approach 1:
The magnetic field system replaces abrupt mechanical spring engagement with smooth magnetic force progression. As the cam linkage rotates, the magnetic attraction/repulsion between the two permanent magnets gradually moves the piston into or out of the latch path, providing both enhanced security and smooth operation without the jerky motion characteristic of spring-based systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The magnetic mechanism provides smoother and more reliable operation, preventing the latch from being rotated out of the engaged position, thus enhancing the lock's security against tampering.
Implementation Method 1
a pair of permanent magnets with like poles creates a repulsive force to move the member from a retracted position to an extended position
Data Source
AI summary
The lock has a rotatable latch. The latch is mounted for movement between a position wherein it engages a fixed part of the vehicle to secure the door in the closed position and a position remote from the fixed part of the vehicle such that the door can be opened. A latch movement preventing member is moveable relative to the latch between a position remote from the path of movement of the latch, wherein the latch is free to disengage the fixed part of the truck, and a position intersecting the path of the latch, wherein movement of the latch to disengage the fixed part of the truck is blocked. A pair of magnets are oriented to force the member to move from its remote position, against the action of a spring, to its intersecting position, to prevent the latch from disengaging the fixed part of the truck.