Vehicle Seat Pivotable Limit Stop Bracket for Extended Travel
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Solution Overview
Problem
Existing longitudinally adjustable vehicle seats lack a standardized and cost-effective solution to expand the functional travel range, as their adjustment mechanisms are specific to particular vehicle seat structures and do not easily accommodate diverse travel ranges between different seat variants.
Innovation Solution
The implementation of a pivotable over-travel and limit stop bracket mechanism, which can bypass the comfort full forward limit stop upon activation of the easy-entry mechanism, allowing the vehicle seat to enter an extended travel range, using standardized parts and modular components like sleeves and Bowden cables to adapt to various seat configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a fixed limit stop structure is used to define the comfort full forward position, then the functional comfort adjustment range is clearly delimited, but the extended travel range cannot be accessed when easy-entry is activated
Solution Approach 1:
The limit stop bracket is designed to be pivotable about a rotation axis, transitioning between a first position where the limit stop arm defines the comfort full forward position and a second position where the limit stop arm is displaced to allow extended travel range access. This dynamic reconfiguration enables the system to adapt between different operational modes.
Solution Approach 2:
The easy-entry mechanism activates the pivotable limit stop bracket to the second position in advance before the seat needs to travel beyond the comfort range. This preliminary action removes the limit stop constraint beforehand, allowing the seat to smoothly enter the extended travel range without obstruction.
2Adaptability or versatility
If customized adjustment mechanisms are designed for each seat variant, then the functional travel range can be precisely tailored, but the device complexity and manufacturing cost increase
Solution Approach 1:
The pivotable limit stop bracket assembly serves multiple functions: it defines the comfort full forward position during normal operation, pivots to allow extended travel range during easy-entry activation, and can be configured with different limit stop arm lengths to accommodate various seat variants. This single mechanism replaces the need for multiple customized adjustment systems.
Solution Approach 2:
The limit stop bracket is divided into separable components including the bracket body, the limit stop arm, and the rotation axis assembly. This segmentation allows for easy configuration changes by replacing individual components with different arm lengths or geometries to match specific seat variant requirements, simplifying customization.
3Manufacturing precision
If a fixed limit stop arm length is used, then the comfort full forward position is precisely defined, but diverse functional travel ranges between seat variants cannot be compensated
Solution Approach 1:
The limit stop arm is designed with variable length capability through interchangeable components or adjustable mechanisms. By changing the arm length parameter, the system can precisely define the comfort full forward position for different seat variants while maintaining the same overall mechanism design, achieving both precision and adaptability.
Data Source
AI summary
A longitudinally adjustable vehicle seat comprises a seat frame, a backrest pivotally mounted on the seat frame and foldable down in the direction of a seat surface of the seat frame, a longitudinal rail guide having a guide rail pair 2 including a lower guide rail 21 and an upper guide rail 22, a seat adjuster mechanism including a releasable locking device 3 for locking and unlocking the position of the upper guide rail 22 relative to the lower guide rail 21 in a design position P between an internal full rear limit stop and a comfort full forward limit stop 62 defining a functional comfort adjustment range D, an easy-entry mechanism for displacing the vehicle seat to an extended travel full forward position C upon folding down the backrest onto the seat surface, and a pivotable over-travel and limit stop bracket 5 which is adapted to rotate to bypass the comfort full forward limit stop 62 upon activation of the easy-entry mechanism for entering an extended travel range.