Quick-assembly structure for chassis and back frame of chair and chair
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Solution Overview
Problem
Existing chairs with screw-connected back frames and chassis face issues such as hole deviations and screw slippage, leading to complex and difficult assembly processes.
Innovation Solution
A quick-assembly structure featuring an inserting portion with a bump and an inserting port equipped with an elastic member and locking block, allowing the back frame and chassis to be assembled by inserting the portion into the port, with the locking block engaging the bump under elastic force to secure the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to connect the back frame and chassis, then the connection is detachable and reusable, but the assembly process becomes complex and prone to hole deviations and screw slippage
Solution Approach 1:
The patent extracts the screw connection mechanism and replaces it with a dedicated inserting portion and inserting port structure. The back frame includes an inserting portion with a bump, while the chassis has a corresponding inserting port with a locking block. This extraction eliminates the need for screws and holes, directly resolving the assembly convenience issue while maintaining connection reliability through the specialized fitting structure.
Solution Approach 2:
The patent introduces an intermediary elastic member (spring) that acts between the locking block and the bump. This elastic member pushes the locking block to automatically engage with the bump when the inserting portion is inserted into the inserting port, providing reliable connection without requiring manual screw operation. The intermediary elastic force ensures consistent engagement while simplifying the user's task to merely insertion.
2Ease of operation
If a simple inserting structure is used, then the assembly process is simplified, but the connection stability and anti-pullout capability are reduced
Solution Approach 1:
The patent applies dynamics by making the locking block movable rather than fixed. The locking block can move along the insertion axis under the influence of the elastic member, allowing it to dynamically engage with the bump during insertion and maintain a secure locked state afterward. This dynamic mechanism provides strong anti-pullout capability while keeping the assembly process simple and convenient.
Solution Approach 2:
The elastic member pre-applies a pushing force to the locking block, positioning it in advance to engage with the bump. This preliminary action ensures that as soon as the inserting portion enters the inserting port, the locking block is already in position to provide strong mechanical interlocking, preventing pullout without requiring additional locking actions from the user.
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 solution provides a convenient and stable assembly process that avoids screw slippage and hole deviations, enhancing user experience by simplifying the assembly and ensuring secure attachment.
Implementation Method 1
the locking block is pushed by means of an elastic force of the elastic member to enter a locking position
Data Source
AI summary
A quick-assembly structure includes an inserting portion and an inserting port allowing the inserting portion to be inserted, where one of the inserting portion and the inserting port is provided on the chassis, and the other one is provided on the back frame. A locking block of the inserting portion is movably arranged relative to the inserting port; and in an assembled state, a bump of the inserting portion is inserted into the inserting port along with the inserting portion, the locking block is pushed by an elastic force of an elastic member of the inserting port to enter a locking position, and at the locking position, a locking end of the locking block enters the inserting port and abuts against an abutting surface of the bump so as to restrict the inserting portion from being pulled out in a direction opposite to an inserting direction thereof.