Chair including a leaf spring in contact with a linkage to provide resistance to tilting of a backrest of the chair

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Solution Overview

Problem

Existing furniture and adjustable systems face challenges in accommodating varying user weights and body types, leading to inefficient and often manual adjustments that are time-consuming and user-unfriendly, compromising comfort and ergonomics.

Innovation Solution

A reconfigurable apparatus with an adjusting assembly that includes a leaf spring and subassemblies to automatically adjust resistance based on user weight, allowing seamless transitions between seating positions without manual intervention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If manual adjusting capabilities are provided to change spring force on back rest, then adaptability to different user weights is improved, but device complexity and ease of operation deteriorate due to multiple actuators and iterative adjustment process

Engineering Contradiction:

Improveadaptability to different user weightsVSAvoidcomplexity of adjusting mechanisms

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The chair mechanism automatically senses user weight and self-adjusts the spring force on the back rest without requiring manual intervention. The system uses the user's own weight to trigger the adjustment process, eliminating the need for separate actuators and iterative manual tuning while maintaining adaptability across different user weights

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The mechanism dynamically changes the spring force parameter based on detected user weight. By automatically adjusting the biasing force in response to weight sensing, the system adapts to different users without requiring manual parameter changes through knobs or levers

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If manual adjusting capabilities are provided to change spring force on back rest, then adaptability to different user weights is improved, but ease of operation deteriorates due to time-consuming iterative adjustment process

Engineering Contradiction:

Improveadaptability to different user weightsVSAvoidease of adjustment operation

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The chair performs self-adjustment by sensing user weight and automatically modifying the back rest spring force accordingly. This eliminates the need for users to spend time iteratively leaning back and adjusting knobs or levers, making the operation instantaneous and effortless while maintaining proper adaptability

Inventive Principle:

Principle #25Self-service

3Device complexity

If fixed biasing mechanism is used to maintain upright back rest position, then structural simplicity is improved, but adaptability to different user weights deteriorates as lighter users must constantly exert pressure

Engineering Contradiction:

Improvesimplicity of biasing mechanismVSAvoidadaptability to different user weights

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The biasing mechanism transitions from a fixed, static spring force to a dynamic system that automatically adjusts the spring force based on detected user weight. This allows the mechanism to maintain simplicity in structure while adapting its performance characteristics to suit different user weights, eliminating the need for lighter users to constantly exert corrective pressure

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 apparatus provides ergonomic support by dynamically adjusting to user weight, enhancing comfort and reducing the need for manual adjustments, thus improving user experience and reducing the risk of discomfort and injuries.

Implementation Method 1

a leaf spring in contact with a linkage to provide resistance to tilting of a backrest

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20260000206A1Chair including a leaf spring in contact with a linkage to provide resistance to tilting of a backrest of the chair

Publication Date: 2026.01.01 DEJULE AARON

AI summary

A chair, comprising, a backrest, a seat coupled with the backrest, a column coupled with the seat, a linkage statically attached to the backrest and rotatably attached below the seat, a leaf spring statically attached at one end and in direct contact with the linkage to provide a resistance to tilting of the backrest relative to the column. A first structure fixed to the column, where a portion of the first structure has an arc shape that includes one or more teeth, and a second structure in contact with the first structure, wherein a portion of the second structure includes one or more teeth. The chair is configured such that, when a weight is applied to the seat, the one or more teeth of the second structure, a pivot point at which the backrest is configured to tilt relative to the column, and the linkage are configured to move together.