Motor Vehicle Door Latch Independent Securing Device
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Solution Overview
Problem
Current motor vehicle door latches do not allow for easy and quick opening from the inside while maintaining external security, particularly for vehicles like lorries where drivers need to remain undisturbed, requiring inconvenient double strokes on the internal door handle.
Innovation Solution
A motor vehicle door latch design where the securing device independently enables/disables the external activation lever chain, allowing the door to be easily opened from the inside without affecting the bolting unit's state, and prioritizes the bolting unit's 'bolted' position to prevent external opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bolting unit is used to secure the door from the outside, then external security is improved, but the door cannot be easily opened from the inside without prior unbolting
Solution Approach 1:
The locking system is divided into two independent control paths: the bolting unit for external securing and the securing device with coupling element for internal access control. This segmentation allows external security to be maintained while enabling easy internal opening without requiring unbolting operations.
Solution Approach 2:
The coupling element acts as an intermediary component that mediates between the securing device and the activation lever chain. When the securing device is activated, it moves the coupling element to a position that prevents external opening while allowing internal opening, thus resolving the contradiction between security and ease of operation.
2Reliability
If the securing device enables/disables the activation lever chain, then external opening is prevented, but internal opening functionality is affected
Solution Approach 1:
The securing device is designed to have different effects on different activation paths: it prevents external opening through the coupling element mechanism while preserving internal opening capability through the independent internal activation lever chain that bypasses the coupling element.
Solution Approach 2:
Instead of the securing device blocking both external and internal access, the design inverts the approach by allowing internal access to continue working while blocking external access through the coupling element mechanism, thus maintaining ease of operation from inside while ensuring security from outside.
3Reliability
If the coupling element is positioned to prevent external activation, then external security is improved, but the activation lever mechanism cannot function externally
Solution Approach 1:
The coupling element is designed to be movable between different positions controlled by the securing device. This dynamic positioning allows the system to adapt between external security mode (coupling element in blocking position) and external activation mode (coupling element in allowing position), providing both security and versatility as needed.
Data Source
AI summary
A motor vehicle door latch which is equipped with a locking mechanism fundamentally comprising a catch and a pawl, furthermore with an activation lever mechanism working on the locking mechanism with a coupling element. Furthermore, a bolting unit enabling/disabling the activation lever mechanism is provided for. Furthermore, a securing device interacting with the coupling element is executed which also enables/disables the activation lever mechanism. According to the invention, the securing device impinges the coupling element independently of the bolting unit for execution of the enabled/disabled position of the activation lever mechanism.