Vehicle Seat Mat Attachment Structure with Force-Sensitive Holder
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Solution Overview
Problem
Conventional seatback structures for vehicle seats restrict the rearward movement of the mat, leading to potential large reaction forces on occupants during strong rearward pressure, such as in vehicle collisions.
Innovation Solution
A mat attachment structure featuring a guide wire with a width-direction extending part and a rotatable holder that separates from the seatback frame when an external force exceeds a predetermined value, allowing the mat to move rearward without applying a large reaction force to the occupant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guide wire uses a pivotable horizontal wire part and vertically movable vertical wire parts, then the mat can move forward and rearward during normal operation, but the rearward movement of the mat is restricted when strong rearward force is applied
Solution Approach 1:
The holder is designed to dynamically change its state from attached to separated based on the applied force. During normal operation, the holder remains attached to the seatback frame, allowing the mat to move forward and rearward. When strong rearward force exceeds a predetermined threshold, the holder automatically separates from the seatback frame, enabling the mat to move rearward freely without restriction.
Solution Approach 2:
The holder's attachment state changes based on the magnitude of applied force. The holder is designed with specific mechanical properties (such as breakable connection parts or detachable structures) that cause it to transition from an attached state under normal forces to a separated state when the applied force exceeds a predetermined threshold, thereby changing the system's mechanical constraints.
2Stability of the object's composition
If the mat is restricted from moving rearward, then the mat maintains its position during normal use, but a large reaction force is applied to the occupant during strong rearward pressure
Solution Approach 1:
The system transitions from a static restricted state to a dynamic free-movement state when needed. The holder dynamically adjusts the mat's rearward movement capability based on the applied force, maintaining position stability during normal use while preventing harmful reaction forces during collision events.
Solution Approach 2:
The holder's separation mechanism converts the harmful effect of strong rearward force (which would otherwise create large reaction forces against the occupant) into a beneficial outcome by allowing the mat to move rearward freely, thereby eliminating the harmful reaction force while maintaining normal position stability.
3Reliability
If the holder is designed to separate under strong force, then the mat can move rearward freely during collision, but the structure becomes more complex
Solution Approach 1:
The holder is divided into separate functional parts: a base part that attaches to the seatback frame and a connection part that connects to the guide wire. This segmentation allows the connection part to be designed as a simple breakable or detachable structure that separates under strong force, while the base part remains firmly attached, achieving the desired functionality with minimal structural complexity.
Solution Approach 2:
The connection part of the holder is designed as a sacrificial element that is intended to separate or break under strong rearward force. This disposable-like design simplifies the overall structure, as the connection part does not need to be designed for high-strength permanent attachment, only for controlled separation when the force threshold is exceeded.
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
Prevents large reaction forces from being applied to the occupant by enabling the mat to move rearward freely, reducing the risk of injury during strong rearward pressure events.
Implementation Method 1
a holder having a base part which holds the width-direction extending part so as to be rotatable around an axis of the width-direction extending part
Implementation Method 2
When an external force exceeding a predetermined value in a direction to separate the holder from the seatback frame, which is derived from the force from the back of the occupant that the mat receives, is applied from the width-direction extending part to the holder, the width-direction extending part departs from the base part or the holder departs from the seatback frame
Data Source
AI summary
A mat attachment structure of a seatback includes: a guide wire attached to the mat and provided with a width-direction extending part extending in s width direction of the seatback frame on a tip or root side of the seatback frame; and a holder having a base part which holds the width-direction extending part so as to be rotatable around an axis of the width-direction extending part and an attachment part attached to the seatback frame. When a force exceeding a predetermined value in a direction to separate from the seatback frame is applied from the width-direction extending part to the holder, the force being due to the force from the back of the occupant that the mat receives, the width-direction extending part departs from the base part or the holder departs from the seatback frame, so that the width-direction extending part is separated from the seatback frame.