Seat Locking System with Segmented Pawl Mechanism
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Solution Overview
Problem
Existing vehicle seat locking systems fail to effectively and reliably lock the seat in both retracted and extended positions, particularly under impact conditions, and do not allow for smooth and secure pivoting between these positions.
Innovation Solution
A seat locking system comprising a lock, a locking pawl, and a linkage system that allows the seat to be selectively pivoted between retracted and extended positions, with a catch and retention member configuration to securely lock the seat in each position, utilizing a resilient biasing member and actuator to facilitate easy movement and secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple locking mechanism is used, then the device complexity is reduced, but the reliability of locking the seat in both retracted and extended positions deteriorates
Solution Approach 1:
The locking mechanism is segmented into two independent locking paths: one for the retracted position (using catch 120 and abutment member 146) and one for the extended position (using retention member 122 and latch member 148). This segmentation allows each locking path to be optimized independently, ensuring reliable locking in both positions without requiring an overly complex unified mechanism.
Solution Approach 2:
The locking pawl 140 acts as an intermediary component that mediates between the seat position and the locking action. It transmits the locking force from the actuator through the linkage system to either the catch 120 or retention member 122, providing a reliable connection mechanism that simplifies the overall system while ensuring dependable locking.
2Reliability
If a secure locking mechanism is implemented, then the reliability is improved, but the ease of operation deteriorates due to difficulty in pivoting between positions
Solution Approach 1:
The locking mechanism is designed to be dynamic rather than static. The locking pawl 140 can pivot freely between locked and unlocked states, and the catch 120 and retention member 122 are designed to engage and disengage smoothly. This dynamic design allows the seat to pivot easily between retracted and extended positions while maintaining secure locking when positioned, resolving the contradiction between reliability and ease of operation.
3Object-affected harmful factors
If the lock engages automatically under impact forces, then the safety is improved, but the device complexity increases due to additional locking components
Solution Approach 1:
The locking mechanism converts the harmful impact force into a beneficial locking action. When impact forces occur, they cause the locking pawl 140 to pivot and engage the catch 120 or retention member 122, automatically securing the seat in place. This converts the harmful impact into a useful locking function without requiring additional active components or complex control systems.
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
The system ensures the seat is securely locked in both retracted and extended positions, preventing unintended movement and maintaining access while allowing easy pivoting, and provides enhanced safety by engaging the lock under impact forces.
Implementation Method 1
utilizing a resilient biasing member and actuator to facilitate easy movement and secure locking
Data Source
AI summary
A seat locking system for selectively locking a pivotable seat in a retracted position and in an extended position. The seat locking system includes a lock and a pivotable locking pawl adapted to selectively engage the lock.