Movable Chair Backrest Linkage for Zero-Wall Reclining

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Solution Overview

Problem

Conventional adjustable sofa chairs fail to adjust to different positions when against a wall, leading to inefficiencies in space usage and discomfort due to gaps between the backrest and sitting pad, and inability to align with a person's back.

Innovation Solution

A movable backrest assembly with a parallelogram configuration of shafts and a position-limiting rivet, allowing for zero spacing with a wall and synchronization with a person's back movements, comprising a backrest assembly, first and second backrest supports, connectors, and a guiding apparatus.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the backrest moves downwardly and backwardly simultaneously in a conventional adjustable sofa chair, then the backrest can adjust to different positions, but the backrest touches the wall before reaching its final position, reducing space usage efficiency

Engineering Contradiction:

Improvebackrest position adjustmentVSAvoidspace usage efficiency

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The backrest is divided into multiple segments that can move independently relative to each other. The first backrest support connects to the seat, the second backrest support connects to the first backrest support, and they are linked through connectors with shafts that enable independent movement. This dynamic segmentation allows the backrest to adjust its configuration during movement, achieving zero spacing with the wall while maintaining full adjustability.

Inventive Principle:

Principle #15Dynamics

2Area of stationary object

If the backrest is fixed in position when the chair is against a wall, then space usage is efficient, but the backrest cannot adjust to different positions, reducing adaptability

Engineering Contradiction:

Improvespace usage efficiencyVSAvoidbackrest position adjustment

Core Design Contradiction:

Area of stationary objectVSAdaptability or versatility

Solution Approach 1:

The backrest assembly incorporates multiple movable joints and connectors that enable adjustment even in confined spaces. The first and second backrest supports are connected through shafts and connectors that allow relative movement, providing adaptability while maintaining zero spacing with the wall when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The backrest is segmented into multiple supports and connectors that can move independently. This segmentation allows the backrest to adjust to different positions by coordinating the movement of individual segments, maintaining both adaptability and space efficiency.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If the chair position remains fixed, then the structure is simple, but the backrest cannot move along with a person's back, causing discomfort

Engineering Contradiction:

Improvechair structureVSAvoidcomfortableness

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The backrest assembly uses a system of shafts and connectors that enable natural movement along with the user's back. The first backrest support, second backrest support, and their connectors are arranged to allow the backrest to follow the contours of a person's back during position changes, improving comfort without requiring complex active control systems.

Inventive Principle:

Principle #15Dynamics

4Device complexity

If the backrest moves in a fixed trajectory, then the mechanism is simple, but gaps form between the backrest and sitting pad at different positions

Engineering Contradiction:

Improvemovement mechanismVSAvoidgap elimination

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The parallelogram configuration of shafts (first, second, sixth, and seventh shafts) creates a dynamic linkage system that maintains the relative position and angle between backrest components during movement. This dynamic geometry ensures the backrest remains properly aligned with the sitting pad throughout the adjustment range, eliminating gaps without requiring complex positioning controls.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9585477B2Movable backrest of an adjustable chair

Publication Date: 2017.03.07 REMACRO TECHNOLOGY CO LTD

AI summary

The invention is directed to a movable backrest of an adjustable chair, which can include: a backrest assembly, a first backrest support, a first backrest connector, a second backrest support, a second backrest connector, and a backrest guiding apparatus; the backrest assembly is connected to the first backrest support through a first shaft, the backrest assembly is connected to the guiding apparatus through a seventh shaft, the first backrest support is connected to the first backrest connector through a second shaft, the backrest guiding apparatus is connected to the first backrest connector through a sixth shaft. The invention is simple, durable, and easy to operate, can help eliminate a gap between the backrest and the sitting pad when the adjustable chair is at different positions, reduce the friction feeling of a person's back and prevent the backrest from touching the well when the adjustable chair is at different positions.