Vehicle Door Latch Emergency Release Mechanism
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Solution Overview
Problem
In existing door latch devices for vehicles, if the motor fails, it is cumbersome to open the hatch door from the interior without removing the trim cover, as the operating mechanism is not easily accessible.
Innovation Solution
The door latch device incorporates an engagement portion and a driving portion with a ratchet mechanism and an emergency-operating portion that allows manual release of the latch from inside the vehicle without removing the trim, enabling easy opening of the hatch door even when the motor is not driven.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor-driven latch mechanism is used, then the door can be securely held in closed position, but the door cannot be opened from interior if motor fails without removing trim cover
Solution Approach 1:
The latch mechanism is divided into two independent parts: a motor-driven engagement portion for normal operation and a manual operating portion for emergency use. The manual operating portion includes a pull cord that can be accessed through the interior trim panel, allowing emergency door opening independent of the motor system.
Solution Approach 2:
A pull cord acts as an intermediary mechanism between the interior cabin and the latch release function. The cord passes through the trim panel to provide mechanical access to the manual operating portion, enabling emergency operation without requiring removal of interior components.
2Ease of operation
If the operating portion is hidden behind trim cover, then interior aesthetics are maintained, but emergency opening becomes troublesome
Solution Approach 1:
The pull cord is pre-routed through the trim panel during manufacturing, creating a predetermined access path that allows emergency operation without requiring any disassembly or modification of interior components at the time of emergency.
Solution Approach 2:
The trim panel itself is designed to accommodate the pull cord access, eliminating the need for separate emergency access mechanisms or modifications. The existing trim structure serves dual purposes: aesthetic coverage and emergency access provision.
Data Source
AI summary
A base plate is provided in one of a door and a vehicle body of a vehicle. A latch is pivotally secured to the base plate and engages with a striker of the other of the door and the vehicle body. A ratchet engages with the latch to allow the door to be held in a closed position. An emergency-operating portion is mounted to the base plate and manually operated at the interior of the vehicle, so that the ratchet is released from the latch, which is then released from the striker. The door can be opened.