Synchronous mechanism for a piece of seating furniture, and piece of seating furniture
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Solution Overview
Problem
Existing synchronous mechanisms for seating furniture, such as office chairs, require complex and space-consuming adjustment mechanisms that demand high forces for manual adjustment and large installation spaces, making them cumbersome and visually obtrusive.
Innovation Solution
A simplified synchronous mechanism featuring a bending element that extends over most of the seat depth, coupled with a pivot lever and bearing point arrangement, allowing for elastic deflection and automatic weight adjustment without the need for complex transmissions, thus reducing the mechanism's size and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex transmission mechanism is used to adjust spring preload, then the adjustment range is sufficient, but the device complexity and installation space increase
Solution Approach 1:
The patent extracts the adjustment function from a complex transmission mechanism and implements it through a simple pivoting spring assembly. The spring assembly can be pivoted about a pivot point to change the pivot points of the spring element in the parallelogram of forces, achieving preload adjustment without complex transmissions.
Solution Approach 2:
The spring assembly is designed to be pivotable, allowing dynamic adjustment of the pivot points of the spring element. This dynamic configuration enables the system to achieve different preload states by changing the geometric arrangement of the spring assembly rather than using complex mechanical transmissions.
2Adaptability or versatility
If the entire spring assembly arrangement is pivoted to adjust preload, then the adjustment is effective, but the installation space requirement increases
Solution Approach 1:
The spring assembly is segmented into multiple components (spring element, support structure, pivot points) that can move independently. Only the necessary portions are pivoted to achieve preload adjustment, rather than moving the entire assembly, thereby reducing the required installation space.
Solution Approach 2:
The adjustment mechanism utilizes pivoting motion in a rotational dimension rather than requiring linear displacement in multiple directions. By changing the pivot points of the spring element through rotation about a fixed pivot, the system achieves effective preload adjustment within a compact spatial footprint.
3Adaptability or versatility
If manual adjustment mechanisms are used, then the resistance can be adjusted individually, but the ease of operation deteriorates due to high force requirements
Solution Approach 1:
The synchronous mechanism is designed to automatically adjust and maintain the appropriate resistance based on the user's weight and preferences. The system self-regulates through the pivoting spring assembly that automatically configures itself to provide the correct preload, eliminating the need for frequent manual adjustments by the user.
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 design provides a slim, unobtrusive, and cost-effective synchronous mechanism that automatically adjusts resistance based on user weight, eliminating the need for manual adjustments and complex mechanisms, while maintaining effective support and movement guidance for the seat surface during backrest tilting.
Implementation Method 1
the bending element can be deflected relative to the seat surface support, in particular elastically, as viewed in the height direction, under the action of a spring force
Data Source
AI summary
A synchronous mechanism for a seating furniture is provided having a seat surface support, a bending element whose length in the sagittal direction extends over a large part of a seat depth of the seat surface support and is coupled to the seat surface support for movement relative thereto. The synchronous mechanism has a backrest support mounted movably relative to the bending element for holding a backrest. The backrest support merges at the end into a pivot lever, coupled to the bending element at a pivot point to be pivotable about an axis of rotation transverse to the sagittal plane, a lever section of the pivot lever is in contact with the seat surface support at a bearing point, and, in the unloaded state of the seating furniture, the pivot point lies higher than the bearing point, as seen in the vertical direction.