Chair Synchronization Mechanism Using Loop-Shaped Elastic Elements
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Solution Overview
Problem
Existing chair designs with weight-activated mechanisms, such as parallelogram mechanisms with articulated rods, are overly complex and not easily adaptable to different seat and backrest configurations, and flexible material-based designs are limited to chairs with specific support surfaces.
Innovation Solution
A chair with a synchronization mechanism using loop-shaped elastic elements and a limit stop device, where loop-shaped elastic elements with front and rear elastic portions allow synchronized movement of the seat and backrest, and a locking device allows user control over the movement, enabling easy adaptation to various configurations and providing proportional resistance based on user weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If parallelogram mechanisms with articulated rods are used for weight-activated movement, then synchronized movement of seat and backrest is achieved, but device complexity increases due to high number of components
Solution Approach 1:
The patent combines the functions of multiple articulated rods and elastic elements into a single loop-shaped elastic element that integrates both support and synchronization functions. This merging reduces the number of separate components while maintaining the weight-activated synchronized movement capability between seat and backrest.
Solution Approach 2:
The loop-shaped elastic element serves multiple functions simultaneously: it provides structural support, enables weight-activated movement, ensures synchronized movement of seat and backrest, and acts as a mechanical spring. This multi-functionality eliminates the need for separate components for each function, reducing overall device 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
The solution simplifies the chair structure, allows easy adaptation to different configurations, and provides synchronized movement of the seat and backrest with resistance proportional to the user's weight, enhancing user comfort and ease of use while maintaining a straightforward design.
Implementation Method 1
The synchronization mechanism comprises two loop-shaped elastic elements spaced apart in the transverse direction, each having a lower portion fixed to the support, an upper portion fixed to the seat, and front and rear elastic portions
Data Source
AI summary
A chair comprising a base structure comprising a support, a seat connected to the support via a synchronization mechanism and movable with respect to the base structure between a lowered position and a raised position, and a backrest connected to the synchronization mechanism and movable between an upright position, corresponding to the lowered position of the seat, and a backward-inclined position corresponding to the raised position of the seat, wherein the synchronization mechanism comprises two loop-shaped elastic elements spaced apart in a transverse direction and each comprising a lower portion fixed to a rigid support, an upper portion fixed to the seat, a front elastic portion and an essentially C-shaped rear elastic portion that connect the upper portion to the lower portion, wherein the backrest is fixed to the rear elastic portions of the loop-shaped elastic elements.