Seat Back Suspension Height Adjustment for Stable Swing Posture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle-mounted seat devices cannot adjust the height of the back rest's swing center to match the shoulder blade height of the seated person, leading to inappropriate swing and posture instability.
Innovation Solution
A vehicle-mounted seat device with a height adjustment mechanism that allows the back rest to be elevated or lowered by changing the length of the upper suspension member, enabling the swing center to be adjusted to the individual's shoulder blade height, using a pulley system to reduce friction and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the back rest is made swingable with respect to the seat back frame, then sway generated during vehicle travel can be absorbed and head posture can be stabilized, but the height of the swing center cannot be adjusted to match different seated persons' shoulder blade heights
Solution Approach 1:
The patent implements a dynamic height adjustment mechanism that allows the relay disc (swing center) height to be changed relative to the seat back main frame. The upper suspension member's length is adjustable, enabling the back rest to be positioned at different heights to match various seated persons' shoulder blade heights, thus achieving adaptability without overly complicating the overall structure.
Solution Approach 2:
The patent changes the parameter of the upper suspension member's length to adjust the height of the back rest. By pulling in or extending part of the upper suspension member, the disposed height of the back rest with respect to the seat back main frame is changed, allowing the swing center height to be customized for different users.
2Reliability
If pulleys are provided at the first engagement member and relay disc to reduce friction, then the upper suspension member can move smoothly and wear is reduced, but the device complexity increases
Solution Approach 1:
The patent introduces pulleys as intermediary elements at the first engagement member and relay disc. These pulleys serve as mediators between the upper suspension member and the engagement members, reducing friction and enabling smooth movement while distributing wear. The pulleys are simple rotational components that significantly improve reliability without adding excessive 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
Enables the back rest to swing more appropriately, stabilizing the seated person's posture by allowing the height of the swing center to be customized to the individual's physical size, while maintaining constant tension in the suspension members and reducing component costs.
Implementation Method 1
the first engagement member and the relay disc are provided with a pulley for hooking the upper suspension member, and the upper suspension member may be provided in a form of a closed loop routed through the first engagement member and the relay disc. Such a structure enables reduction in friction between the upper suspension member and the first engagement member and the relay disc
Data Source
AI summary
A vehicle-mounted seat device includes an SB main frame, a back rest which the back of a seated person leans on, a relay disc fixed to the back rest, a first engagement member fixed with respect to the SB main frame at a position higher than the relay disc, an upper wire for suspending and holding the back rest from the first engagement member so as to be able to swing with respect to the SB main frame with the relay disc being the center, and a height adjustment mechanism constructed to be capable of pulling in part of the upper wire, so that an amount by which the upper wire is pulled in is changed to cause a change in disposed height of the back rest with respect to the SB main frame.