Seat Backrest Tilting Mechanism With Internal Return Torque
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Solution Overview
Problem
Existing seat tilting mechanisms often lack controlled and comfortable tilting functionality, as they typically originate from the seat support with adjustable tension, whereas the present mechanism requires a unique configuration with a horizontal pivot axis and return torque management within the backrest for enhanced user comfort.
Innovation Solution
The mechanism employs flexible elastic bars on either side of the pivot axis, fixed to the backrest and interacting with pivots, providing differential tension and improved responsiveness, with caps to reduce noise and wear, and a polyoxymethylene ring for smooth rotation, allowing controlled tilting and return to a stable position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional tilting mechanisms originating from the seat support are used, then the structure is simple, but the dynamic comfort and responsiveness to user position changes are insufficient
Solution Approach 1:
The backrest is divided into multiple segments (upper backrest, lower backrest, seat cushion) that can tilt independently around a horizontal axis, allowing each segment to respond differently to user needs and improve dynamic comfort while maintaining a manageable structural complexity through modular design
Solution Approach 2:
The tilting mechanism incorporates dynamic elements including elastic return means that provide variable tension during tilting movement, and adjustable tensioning means that allow the system to adapt to different user weights and preferences, transforming a static structure into a dynamic comfort system
2Productivity
If elastic return means are placed in the backrest to provide return torque, then the responsiveness and comfort are improved, but the manufacturing complexity and structural requirements increase
Solution Approach 1:
The elastic return means are localized within specific housings in the backrest structure, with each housing containing return means for specific pivot points. This localization allows for standardized manufacturing of modular components while achieving the desired responsiveness and comfort characteristics
Solution Approach 2:
Housings are introduced as intermediary components that contain and organize the elastic return means, separating the complex elastic elements from the main backrest structure. This intermediary structure simplifies manufacturing by allowing pre-assembly of return mechanism modules that can be integrated into the backrest
3Force
If flexible bars are used as return means, then the return torque is effectively provided, but noise and wear from friction increase
Solution Approach 1:
The elastic nature of the flexible bars, which could potentially cause rubbing noise and wear, is converted into a beneficial feature by designing the bars to work within controlled deflection limits using side walls as stops. The elasticity provides smooth return torque while the controlled movement prevents harmful friction and noise
4Ease of operation
If the backrest pivots around a horizontal axis, then the tilting control is improved, but the requirement for precise return torque and structural configuration increases complexity
Solution Approach 1:
The horizontal pivot axis configuration is designed to serve multiple functions simultaneously: it provides intuitive tilting control, enables effective return torque application, and allows for compact structural integration. The standardized pivot and housing design creates a universal module that can be replicated on both sides of the backrest
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
This configuration enhances user comfort by providing a responsive and quiet tilting experience with reduced wear, while maintaining structural integrity and economic viability through a specific structure that manages dynamic comfort and tilting constraints effectively.
Implementation Method 1
the return means consist, at the level of each pivot, of at least one elastic flexible bar placed on each side of a horizontal median plane comprising the pivot axis
Implementation Method 2
a polyoxymethylene ring is preferably interposed between each pivot and the frame or the shell of the backrest
Implementation Method 3
at least each flexible bar in contact with the abutment of the pivot to comprise a plastic material cap, so as not to generate noise and to reduce the wear which may come from the friction of the bar against the pin protruding from the pivot plate
Data Source
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AI summary
The invention relates to a mechanism for the controlled tilting of the backrest (3) of a seat (1) relative to a framework (4) of the seat (1) defining a pivoting axis with a horizontal course, the tilting amplitude being defined between a first stable angular rest position and a second angular position of maximum tilting, a return means (16, 16') being inserted between said framework (4) and the backrest (3) to return the backrest (3) to the first stable position thereof in the event of tilting. Said mechanism is characterised in that said return means (16, 16') is placed inside the backrest (3) and exerts a return torque relative to the pivoting axis, which is defined by two pivots (10) rigidly connected to the framework (4) about which said backrest (3) is laterally pivotably connected.