Free Floating Paddle Actuation System for Vehicle Door Latch
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Solution Overview
Problem
Paddle-type door handles in vehicles often lead to component breakage due to users mistakenly pulling a locked handle, believing it to be stuck, as there is no clear indication of the locked state, and existing solutions do not provide a free-floating mechanism that engages logic only when unlocked.
Innovation Solution
A paddle handle assembly with a logic assembly comprising a drive plate, driven plate, and lock arm that pivots when unlocked, disengaging when locked, ensuring the paddle only unlatches the door when the lock arm is in the unlocked position, and remains stationary when locked, preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the paddle handle is connected to the latch mechanism through linkages, then the door can be opened when unlocked, but the handle may break if users pull harder when locked
Solution Approach 1:
The logic assembly acts as an intermediary between the paddle handle and the latch mechanism. It includes a drive plate, driven plate, and lock arm that mediate the force transmission. When locked, the lock arm prevents the drive plate from engaging the latch linkage, so user force on the paddle does not reach the latch mechanism, preventing breakage while maintaining normal operation when unlocked
Solution Approach 2:
The locking function is extracted from the direct paddle-latch connection and placed into a separate logic assembly. This allows the paddle handle to be decoupled from the latch mechanism when locked, removing the harmful force transmission path while preserving the opening function when unlocked
2Device complexity
If the paddle handle provides no indication of locked state, then the structure remains simple, but users may mistakenly believe it is stuck and pull harder
Solution Approach 1:
The logic assembly provides mechanical feedback to the user about the locked state. When locked, the lock arm positions itself to prevent drive plate engagement, creating a noticeable difference in paddle movement resistance or position that indicates the locked state without requiring additional indicators or complex electronics
Data Source
AI summary
A free floating paddle handle assembly is provided for a vehicle door having a latch. The handle assembly includes a housing with a pivotal paddle on the front and a logic assembly on the back. The handle can be pulled from its neutral or rest position to an actuated position so as to rotate the logic assembly when a lock cylinder is unlocked so as to release the latch. When the lock cylinder is locked, the paddle free floats and does not move the logic assembly, such that the logic assembly is inoperative and the latch remains closed.