Adjusting Door Handle Assembly With Three-Position Retraction Correction
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Solution Overview
Problem
Existing door handle assemblies lack an effective adjusting mechanism that ensures the door handle is fully retracted even in exceptional conditions such as ice formation or contamination, and there is a need for an improved mechanism that can automatically correct incomplete retraction.
Innovation Solution
A door handle assembly with an adjusting mechanism comprising a drive unit, force transfer element, and retraction device, where the force transfer element moves between closed, open, and correcting positions to ensure the door handle is fully retracted, and includes a sensor system to detect and correct incomplete retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adjusting mechanism is used to move the door handle between positions, then the mechanism structure is simple, but the door handle cannot be fully retracted in exceptional conditions such as ice formation or contamination
Solution Approach 1:
The adjusting mechanism includes a correcting position that is prepared in advance to handle exceptional conditions. When the door handle fails to retract fully due to ice or contamination, the force transfer element can move to the correcting position to apply additional retraction force, ensuring complete retraction before returning to the closed position.
Solution Approach 2:
The mechanism incorporates a sensor unit that detects whether the door handle has fully retracted to the starting position. Based on this feedback, the control unit determines whether to activate the drive unit for correction, creating a closed-loop control system that ensures reliable retraction while avoiding unnecessary activation.
2Ease of operation
If the force transfer element continuously moves between closed and open positions, then the door handle adjusts normally, but incomplete retraction occurs in exceptional conditions
Solution Approach 1:
A sensor unit detects the position of the door handle and provides feedback to the control unit. The control unit uses this information to determine whether the door handle has fully retracted, and only activates the drive unit for correction when incomplete retraction is detected, ensuring both normal operation and reliable correction.
Solution Approach 2:
The force transfer element is designed to move dynamically between three positions: closed, open, and correcting. The system adapts its behavior based on operational needs - using only closed and open positions during normal operation, and transitioning to the correcting position when exceptional conditions require additional retraction force.
3Reliability
If a sensor system is added to detect and correct incomplete retraction, then the reliability of full retraction is improved, but the device complexity increases
Solution Approach 1:
The sensor unit and control unit create a self-monitoring and self-correcting system. The sensor automatically detects incomplete retraction, the control unit automatically activates the drive unit for correction, and the system returns to normal operation automatically after correction, eliminating the need for manual intervention.
Solution Approach 2:
The sensor unit provides continuous feedback on the door handle position to the control unit, which uses this information to make automated decisions about when correction is needed. This closed-loop feedback system ensures reliable detection and correction while minimizing unnecessary activation of the drive unit.
Data Source
AI summary
A door handle assembly may have an adjustable door handle having a handle support structure and an adjusting mechanism for adjusting the door handle between a non-use position and a use position. The adjusting mechanism may have at least one drive unit and a force transfer element. The force transfer element can be moved by the drive unit between a closed position corresponding to the non-use position of the door handle, an open position corresponding to the use position of the door handle, and a correcting position. The force transfer element may be in operative connection to the handle support structure to move the door handle between the non-use position and the use position. The force transfer element, during a movement from the closed position into the correcting position, actuates the retraction device so that the door handle is moved into the non-use position.