Synchronous seat adjustment
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Solution Overview
Problem
Existing chair designs with synchronous adjustment between backrest and seat inclination lack efficient material usage, productive assembly, ease of maintenance, and aesthetic design while providing optimal ergonomic functionality.
Innovation Solution
A chair design featuring independently articulated backrest brackets with elastic deformation, supported by adjustable spring units and a height-adjustable gas spring, allowing for synchronized back and seat inclination adjustment from zero to maximum positions with minimal maintenance and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronous adjustment mechanism is implemented, then ergonomic functionality is improved, but device complexity increases
Solution Approach 1:
The backrest is divided into multiple independently adjustable segments (upper backrest, lower backrest, headrest) that can be adjusted separately. This segmentation allows the complex ergonomic adjustment function to be broken down into simpler, independent adjustment mechanisms, making the overall system more manageable despite its versatility.
Solution Approach 2:
The chair employs dynamic adjustment mechanisms including height-adjustable gas spring, tilt tension adjustment, and multi-position locking systems. These dynamic elements allow the chair to adapt to different user preferences and positions, providing ergonomic functionality through controlled movement and adjustment capabilities.
2Manufacturing precision
If multiple spring units are used for adjustment, then adjustment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The adjustment mechanism is segmented into multiple spring units (first spring unit, second spring unit, third spring unit) each responsible for specific adjustment functions. This segmentation allows for precise control of different movement aspects while enabling modular manufacturing and assembly of each spring unit independently.
Solution Approach 2:
The spring units are designed with adjustable parameters including spring constant, pre-load, and free length. These parameter changes allow precise adjustment of the chair's mechanical behavior without requiring complex manufacturing processes, as the precision is achieved through adjustable parameters rather than tight manufacturing tolerances.
3Adaptability or versatility
If independent backrest arms are implemented, then ergonomic support is improved, but material usage increases
Solution Approach 1:
The backrest structure is segmented into two independent backrest arms (first backrest arm, second backrest arm) that can move independently. This segmentation provides improved ergonomic support by allowing asymmetric adjustment for each side, while the arms share common mounting points and structural elements to minimize overall material usage.
Solution Approach 2:
The backrest arms are designed as multi-functional components that provide both structural support and adjustment functionality. They serve multiple purposes: supporting the backrest, enabling independent movement, providing mounting points for springs, and acting as leverage arms for adjustment mechanisms, thereby reducing the need for separate components and minimizing material usage.
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 chair provides enhanced ergonomic support, efficient material usage, and ease of maintenance while ensuring optimal ergonomic functionality through synchronized back and seat inclination adjustments, supporting user comfort and aesthetic appeal.
Implementation Method 1
a height-adjustable gas spring is arranged in the base, upon which the base rests, allowing the seat support to be adjusted to a user-friendly height
Implementation Method 2
The back of the seat support is elastically torsionally flexible
Implementation Method 3
A first spring unit is provided on the chair, which acts against the respective movable backrest bracket. A second spring unit is connected in parallel to the first spring unit
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Disclosed is a type of seat with relative synchronous displacement between back incline and seat incline, specifically along a region between a respective zero position of back incline (R0) and seat incline (S0) and a respective maximum back incline and seat incline. The seat has an underframe (1) which is intended to be placed on the floor and on which a base (2) is rigidly secured. A seat support (6) is connected to the base (2) and has a seat region and a back region. The seat also comprises two backrest frames (3) which can be extended separately towards each other and which are secured at one side on the base (2) and at another side on the back region of the seat support (6). The two backrest frames (3) are attached independently of each other on the base (2) on a stationary first axis of rotation (D1). The seat region of the seat support (6) is attached on the base (2) on a stationary second axis of rotation (D2). The two backrest frames (3) are attached independently of each other on the back region of the seat support (6) on an elastically deformable third axis of rotation (D3). The back region of the seat support (6) is elastically twistable. A cover is stretched over the seat support. In the embodiment as a rotating office seat, a height-adjustable gas spring (12) is arranged in the underframe (1), on which gas spring the base (2) rests, in order to set the seat support (6) at a height which corresponds to the needs of a user and in order to design a vertical axis (V) in rotatable manner.