Seat Belt Presenter Locking Mechanism for Manual Retraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing seat-belt presenters for motor vehicles lack a reliable and simple locking mechanism that prevents mechanical damage during manual retraction, especially in emergency situations where the electric supply fails.
Innovation Solution
A pivoting unit with a locking device that locks the pivoting element in the expanded position during supply to prevent inward pivoting under seatbelt force, allows inward pivoting with manual force in emergency mode, and automatically unlocks during retraction, using mechanical elements and spring forces to control the locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device is added to prevent the pivoting element from pivoting inward during supply, then the reliability of the seat-belt presenter is improved, but the device complexity increases
Solution Approach 1:
The locking device is designed to lock and unlock automatically based on the position of the guide means during supply and retraction operations, without requiring external control systems or additional actuators. The mechanism self-regulates through mechanical interaction with the guide means, achieving reliable locking while minimizing added complexity
Solution Approach 2:
A control element acts as an intermediary between the guide means and the locking element, translating the supply/retraction movements into corresponding locking/unlocking actions. This intermediary mechanism enables reliable automatic locking while keeping the overall device structure relatively simple through mechanical coupling
2Strength
If the locking device is made robust to prevent mechanical damage during manual retraction, then the strength of the pivoting element is improved, but the ease of operation deteriorates
Solution Approach 1:
The locking device incorporates spring elements that provide dynamic, force-dependent locking. During normal operation, the spring maintains secure locking, but during emergency manual retraction, the spring allows controlled yielding when sufficient force is applied, enabling both strength and ease of operation
Solution Approach 2:
The locking force of the locking device is made variable through spring elements that can be designed with specific force characteristics. The locking mechanism provides strong holding force under normal conditions but allows controlled release when a predetermined force threshold is exceeded during emergency manual operation
3Ease of operation
If automatic unlocking during retraction is implemented, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The locking device automatically unlocks during retraction through mechanical interaction between the guide means and the control element, which in turn actuates the locking element. This self-service automatic unlocking improves ease of operation while avoiding the need for separate control systems or additional complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures the seat-belt presenter can be safely retracted manually without mechanical damage, preventing the pivoting element from breaking off and maintaining functionality even without electric power.
Implementation Method 1
using mechanical elements and spring forces to control the locking mechanism
Implementation Method 2
allows inward pivoting with manual force in emergency mode
Data Source
AI summary
A seat-belt presenter for a motor vehicle includes a seat-belt capture unit for supplying a seatbelt, a guide device for supplying and retracting the seat-belt capture unit, a pivoting element and a pivoting unit which, together with the pivoting element, form the seat-belt capture unit. The pivoting unit contains a locking device which during the supply operation, locks the pivoting element in its expanded position in such a manner that it does not pivot inward under the dynamic effect of the seatbelt, permits the pivoting element to pivot inward with manual application of force while it is still locked, and automatically unlocks during retraction of the guide device.