Office Chair Backrest Carrier With Spaced Joints for Lateral Tilt
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Solution Overview
Problem
Existing office chairs with synchronous and tilting mechanisms for dynamic sitting often lack sufficient lateral tilting capabilities, which can lead to discomfort and increased back fatigue during prolonged sitting periods.
Innovation Solution
The design incorporates a U-shaped backrest carrier with two vertical U-shaped members connected by a horizontal member, featuring spaced rotary joints for lateral tilting, along with resilient and flexible components to allow for ergonomic lateral movement and restore the backrest to an upright position, enhancing seating comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a synchronous mechanism is used for forward and backward inclination, then dynamic sitting is promoted, but lateral tilting capability is insufficient
Solution Approach 1:
The backrest carrier is divided into multiple segments including a seat carrier, backrest carrier proper, and lateral tilting mechanism components. This segmentation allows independent movement in different directions - forward/backward inclination through the synchronous mechanism and lateral tilting through the rotary joints, resolving the contradiction by enabling both movements without interference
Solution Approach 2:
The invention adds a lateral tilting dimension to the existing forward/backward inclination mechanism. By introducing rotary joints that enable movement perpendicular to the original rocking plane, the system transforms from single-plane movement to multi-plane movement, providing comprehensive adaptability while maintaining operational simplicity
2Adaptability or versatility
If resiliently loaded rotary bearings are used for lateral tilting, then lateral movement is enabled, but the structure becomes complex
Solution Approach 1:
The lateral tilting mechanism is merged with the existing backrest carrier structure. The rotary joints are integrated into the connection between the seat carrier and backrest carrier, sharing common components and mounting points. This merging reduces overall complexity compared to adding a completely separate lateral tilting mechanism
Solution Approach 2:
The backrest carrier structure serves multiple functions: it supports the backrest, enables forward/backward inclination through the synchronous mechanism, and enables lateral tilting through the rotary joints. This multi-functionality reduces the need for additional specialized components, simplifying the overall device complexity while maintaining adaptability
Data Source
AI summary
An item of seating furniture, in particular an office chair, has a seat carrier for a horizontal seat member, and a backrest carrier for a vertical backrest. The backrest carrier is constructed in a substantially U-shaped manner with two vertically orientated U-shaped members and with a horizontal upper U-shaped member. Wherein, along at least one rotation axis which extends below the seat member, a first rotary joint and a second rotary joint are provided for the lateral tilting movability of the backrest with respect to the seat carrier. The first and second rotary joints are arranged spaced apart from each other along the rotation axis.