Quick-assembly structure for chassis and seat cushion of chair

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Solution Overview

Problem

Existing chair seat cushions and chassis assemblies are cumbersome and prone to screw slippage or misalignment during assembly, leading to incomplete or unstable connections.

Innovation Solution

A quick-assembly structure utilizing inserting and clamping members and elastic buckles to secure the seat cushion and chassis, eliminating the need for screws, ensuring stable vertical alignment through inserting and clamping grooves and elastic buckles that prevent separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If screw connection is used to assemble chassis and seat cushion, then the connection can be achieved, but the assembly operation becomes strenuous and time-consuming with frequent screw slippage or hole deviation

Engineering Contradiction:

Improveassembly operationVSAvoidassembly reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces the traditional screw-threaded connection system with a direct inserting-fit mechanism. The inserting member with clamping portion slides into the groove body along guide grooves, eliminating screws entirely. This substitution transforms the assembly operation from threading screws into simple insertion and sliding motions, dramatically improving ease of operation while maintaining connection reliability through the clamping structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The guide grooves act as intermediaries that guide the inserting member during assembly. These grooves ensure proper alignment and direction of the inserting member, preventing hole deviation and misalignment issues. The guide grooves mediate between the inserting member and groove body, ensuring reliable connection by controlling the assembly path and preventing operational errors.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If screws are used for assembly, then connection can be made, but screw slippage or hole deviation occurs frequently causing assembly failure

Engineering Contradiction:

Improveconnection stabilityVSAvoidassembly difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the screw connection system with an inserting-fit mechanism featuring a clamping portion that engages with the groove body. This eliminates screw slippage and hole deviation by using a direct fit design where the inserting member slides into the groove body along guide grooves, ensuring proper alignment and preventing operational errors while maintaining secure connection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The guide grooves are pre-formed on the groove body to anticipate and guide the inserting member's path during assembly. This preliminary action of creating guiding structures in advance ensures that the inserting member automatically aligns correctly, preventing misalignment and deviation before they can occur during the assembly operation.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If traditional screw assembly is used, then chassis and seat cushion can be connected, but the assembly process is time-consuming and cumbersome

Engineering Contradiction:

Improveassembly speedVSAvoidassembly structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces the multi-step screw assembly process with a single-insertion operation. The inserting member with clamping portion is inserted into the groove body along guide grooves in one continuous motion, eliminating the need for multiple screw insertion, tightening, and alignment steps. This substitution dramatically increases assembly speed while the integrated guide groove design keeps the structure simple and easy to manufacture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Facilitates rapid, secure, and stable assembly of the seat cushion and chassis without screw deviations, enhancing convenience and stability during assembly and disassembly.

Implementation Method 1

the seat cushion is further provided with elastic buckles, the chassis comprises a clamping connection surface, and when the inserting and clamping members slide to predetermined positions in the clamping grooves, the elastic buckles are clamped with the clamping connection surface of the chassis in an abutting manner

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12440028B2Quick-assembly structure for chassis and seat cushion of chair

Publication Date: 2025.10.14 ZHEJIANG SUNON FURNITURE MFG

AI summary

A quick-assembly structure includes first inserting connection structures, where each of the first inserting connection structures includes an inserting and clamping member and a groove body; each of the groove bodies includes an inserting groove and a clamping groove which are in communication with each other, the corresponding inserting and clamping member is inserted into the inserting groove in a vertical direction and then horizontally slides into the clamping groove in a first direction; and the seat cushion is further provided with elastic buckles, the chassis includes a clamping connection surface, and when the inserting and clamping members slide to predetermined positions in the clamping grooves, the elastic buckles are clamped with the clamping connection surface of the chassis in an abutting manner so as to restrict the chassis from sliding relative to the seat cushion in a direction opposite to the first direction.