Retractable Door Handle Deployment for Ice Break and Safe Retraction
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Solution Overview
Problem
Existing retractable door handles face issues such as user entrapment during retraction, damage from abuse, difficulty in use, especially in icy conditions, and lack of intuitive locking and unlocking functionality.
Innovation Solution
A retractable handle arrangement with a motor-driven mechanism that modulates force and speed of deployment using a transmission device, featuring a worm gear, gear wheel, and eccentric cam, ensuring a high initial force to break ice and a gradual stop, with intuitive locking and unlocking buttons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a retractable door handle is mounted flush with the door skin to achieve aesthetic and aerodynamic benefits, then the handle lies flush with the surrounding door skin, but the handle becomes difficult to grasp and use
Solution Approach 1:
The handle is designed to be dynamic rather than static, automatically extending when the door is unlocked and retracting when locked. This allows the handle to provide both aesthetic flush mounting and functional ease of grasping at different operational states, eliminating the need for the user to manually deploy the handle.
2Extent of automation
If an automated mechanism is used to retract the handle from deployed to stowed state, then the handle can be automatically retracted, but user's fingers may become trapped between the handle and door skin
Solution Approach 1:
The retraction mechanism is designed to retract the handle toward the user rather than away, reversing the conventional approach. The handle is pulled into the door skin by a spring-loaded mechanism that actively draws it in, ensuring that even if the user is holding the handle, their fingers cannot be trapped as the handle moves in the direction that closes the gap rather than opens it.
Solution Approach 2:
The automated retraction mechanism incorporates a controlled deceleration phase that slows the handle as it approaches the fully retracted position. This cushioning effect prevents sudden movements that could trap fingers, and the system monitors the retraction process to ensure safe operation before completing the full retraction cycle.
3Ease of operation
If a protruding bar-like handgrip is used to improve ergonomics and load transferral, then the handle can be comfortably grasped, but the handle cannot be flush-mounted with the door skin
Solution Approach 1:
The handle transitions from a flush-mounted retracted state to a protruding deployed state automatically when the door is unlocked. This dynamic transformation allows the handle to maintain aesthetic flush mounting during normal door appearance while providing ergonomic grasping capability when needed, combining both benefits temporally.
4Productivity
If the handle is designed to be easily deployable, then the handle can be quickly extended for use, but the mechanism may be susceptible to damage from abuse when users force the handle
Solution Approach 1:
The mechanism incorporates a pre-loaded spring system that provides resistance against forced deployment attempts. When a user attempts to force the handle, the spring mechanism engages to prevent unauthorized or abusive operation, while still allowing normal automated deployment when the door is properly unlocked. This preliminary protective action distinguishes between legitimate and abusive use.
Data Source
AI summary
A retractable handle arrangement includes a handle movable between stowed and deployed states, a motor and transmission mechanism arranged to couple the motor to the handle for moving the handle from the stowed state to the deployed state when the motor is driven in a first direction, and to modulate the force exerted on the handle and the speed at which the handle is deployed as the handle travels from the stowed state to the deployed state.