Rotatable Chair Backrest for Table-Suspended Leg Storage

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Solution Overview

Problem

Conventional chair-holding structures for dining tables obstruct cleaning and impair the aesthetic and usability of the table, especially when using cleaning robots, and are not suitable for chairs with integral armrests.

Innovation Solution

A chair design with a lower backrest that can be rotated and magnetically held in a horizontal position to engage with the table top, allowing the legs to be suspended above the floor, eliminating the need for a large holding plate and enabling easy storage and use without altering the table's design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a large holding plate is used to hold the chair seat, then the chair can be securely held on the table, but the aesthetic property of the table is impaired and the space for leg storage is reduced

Engineering Contradiction:

Improvechair holding stabilityVSAvoidtable aesthetic property

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The invention extracts the chair-holding function from the table structure by transferring it to the chair itself through the backrest engaging means. The engaging means projects from the backrest to engage with the top plate, removing the need for a holding plate on the table and thus preserving table aesthetics while maintaining secure chair attachment

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of having the table provide the holding structure (holding plate), the invention inverts the approach by having the chair provide its own holding structure through the backrest engaging means that connects to the table. This role reversal eliminates the need for a large holding plate on the table

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If a large holding plate is used to hold the chair seat, then the chair can be securely held on the table, but the space for leg storage beneath the table is reduced

Engineering Contradiction:

Improvechair holding stabilityVSAvoidleg storage space

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The holding function is extracted from the table's under-space and relocated to the chair's backrest structure. The engaging means on the backrest provides secure attachment without occupying storage space beneath the table, thus preserving leg storage volume while ensuring reliable chair holding

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If the seat has integral armrests, then the chair design is simplified and comfort is improved, but the seat cannot enter the space between the top plate and holding plate

Engineering Contradiction:

Improvechair comfort and design simplicityVSAvoidcompatibility with holding structure

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The invention inverts the compatibility problem by having the chair initiate the connection through its backrest engaging means rather than requiring the table's holding structure to accommodate the chair. This approach allows chairs with integral armrests to engage with the table without needing to fit into a space between the top plate and holding plate

Inventive Principle:

Principle #13The other way round (Inversion)

4Device complexity

If the backrest is fixed in position, then the chair structure is simplified, but the chair cannot be held on the table with legs suspended

Engineering Contradiction:

Improvechair structure simplicityVSAvoidchair holding capability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The backrest is designed with dynamic capability to rotate between a normal use position and a horizontal position. When horizontal, the engaging means on the backrest can project forward to engage with the top plate, enabling the chair to be held on the table with legs suspended. The rotation mechanism maintains structural simplicity while providing the necessary functional versatility

Inventive Principle:

Principle #15Dynamics

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 can be securely held on the table with its legs suspended, maintaining the table's aesthetic and usability, and accommodating chairs with armrests, while allowing for efficient cleaning and easy handling by users of varying strength.

Implementation Method 1

A chair design with a lower backrest that can be rotated and magnetically held in a horizontal position to engage with the table top

Methodology Applied

Scientific EffectMagnetic holding: Magnetism

Data Source

PatentUS8915545B2Chair with rotatable backrest

Publication Date: 2014.12.23 FRANCE BED CO LTD

AI summary

A chair for use in combination with a table. The chair has a seat, a back and four legs. To the back, an upper backrest and a lower backrest are secured. The lower backrest can rotate with respect to the back. While projecting forwards from the back, the lower backrest engages with the upper surface of the top plate of the table. The chair is therefore supported, with the legs suspended above the floor.