Chair chassis and chair
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Solution Overview
Problem
Conventional chair backrest adjustment mechanisms are limited in allowing the backrest to adjust and move with the user's body, resulting in poor comfort due to structural constraints.
Innovation Solution
A chair chassis with a backrest support system that includes a memory stopper, locking slider, elastic members, and a rack mechanism, allowing for adjustable reclination and pitching of the backrest, enabling it to automatically adjust and lock at desired angles, ensuring proper support and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the backrest is adjusted to a desired angle and fixed using conventional adjustment mechanisms, then the backrest can be positioned at specific angles, but it cannot move with the movement of the user's back, resulting in poor comfort
Solution Approach 1:
The patent transforms the static fixed-angle backrest into a dynamic system that can automatically adjust and lock at multiple positions. The backrest support assembly includes a backrest support, a seat plate with a rack, and an elastic member that enables the backrest to dynamically follow user body movements while maintaining stable locked positions at desired angles through the engagement of rack teeth with limiting blocks.
Solution Approach 2:
The backrest adjustment system operates autonomously through the interaction between the elastic member, rack, and limiting blocks. When the user reclines, the elastic member drives the rack to move, automatically engaging with limiting blocks to lock at specific angles without requiring manual intervention. The system self-adjusts to maintain contact with the user's back during movement.
2Adaptability or versatility
If the backrest is allowed to move freely to follow user body movement, then comfort is improved, but the backrest cannot maintain stable positions at desired angles
Solution Approach 1:
The system enables controlled movement through the elastic member that allows the backrest to follow user body dynamics while the rack-teeth-to-limiting-block engagement provides discrete stable locked positions. This creates a dynamic system that transitions between stable states rather than being completely fixed or completely free.
Solution Approach 2:
The elastic member acts as a cushioning element that stores and releases energy to maintain backrest movement freedom while the limiting blocks pre-positioned along the rack provide beforehand-determined stable locked positions. The elastic member cushions the transition between positions and maintains contact with the user's back throughout the movement range.
3Device complexity
If a simple fixed-angle adjustment mechanism is used, then the structure is simple, but the backrest cannot provide continuous support during user body movement
Solution Approach 1:
The patent introduces dynamic elements (elastic member, movable rack with teeth) to a traditionally static adjustment mechanism. The rack moves along guide grooves and engages with limiting blocks at specific positions, providing continuous support during movement while maintaining relatively simple structural components that can be manufactured and assembled efficiently.
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 system allows for unlimited adjustment of reclination angles, ensuring the backrest moves with the user's body, providing enhanced comfort and support by automatically adjusting to maintain contact with the user's back.
Implementation Method 1
a first elastic member, connected between the locking slider and the base, and configured to supply a restoration elastic force for sliding towards the memory stopper to the locking slider
Implementation Method 2
a second elastic member, connected between the elastic slider and the base, and configured to supply an elastic force for sliding away from the locking slider to the elastic slider
Implementation Method 3
a third elastic member, connected between the active slider and the base, and configured to supply an elastic force for sliding towards the elastic slider to the active slider
Data Source
AI summary
A chair chassis includes: a base, provided with an accommodation chamber; a backrest support; a memory stopper, disposed on the backrest support, wherein the memory stopper is provided with a first arc surface facing the base; a locking slider, slidably disposed in the accommodation chamber of the base, wherein the locking slider is provided with a second arc surface disposed opposite to the first arc surface, and a side of the locking slider is provided with a first rack; a first elastic member; and an elastic slider, slidably disposed in the accommodation chamber of the base, wherein one end of the elastic slider is provided with a second rack, wherein the second rack is meshable with the first rack. Accordingly, the chair chassis according to the embodiments of the present disclosure achieves reclination memory adjustment of a backrest of the chair.