Plastic Snap-Fit Joint With Flexing Socket Wall Lock
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Solution Overview
Problem
Existing snap-fit joints for plastic frame elements are overly complex, inefficient, and costly to manufacture, making them difficult to construct effectively.
Innovation Solution
A snap-fit joint design featuring a plastic male member with an insertion end and a flexible female member socket, where the socket's upstanding walls temporarily flex outward to receive the male member, ensuring secure locking through co-acting surfaces and tabs, allowing for efficient assembly and construction of plastic frameworks like chair frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional snap-fit joints are used for plastic frame elements, then the joints can provide connection functionality, but the design becomes overly complex and manufacturing becomes inefficient and costly
Solution Approach 1:
The joint is divided into two distinct components: a male member with an insertion end and a female member with a socket. This segmentation allows each component to be manufactured separately using simple, efficient processes while maintaining connection functionality, directly reducing manufacturing complexity and cost.
Solution Approach 2:
The female member's socket is designed with flexible upstanding walls that temporarily deform outward during insertion, reversing the traditional approach where the male member deforms. This inversion simplifies the male member's design and enables more efficient manufacturing of both components.
2Ease of operation
If traditional snap-fit joints are used for plastic frame elements, then the joints can provide connection functionality, but the construction process becomes difficult
Solution Approach 1:
The female member's socket incorporates dynamically flexible upstanding walls that can temporarily deform outward during the insertion process and then return to their original position. This dynamic flexibility allows the male member to be easily inserted and securely locked in place, significantly improving construction ease while maintaining a simple joint design.
Solution Approach 2:
The material properties of the female member are optimized to provide temporary flexibility during insertion, allowing the upstanding walls to deform and then recover. This parameter change enables simple, tool-free assembly while maintaining connection strength, directly improving construction ease without increasing complexity.
3Ease of operation
If the socket walls are made flexible to receive the male member, then the insertion process becomes easier, but the structural strength may be compromised
Solution Approach 1:
The upstanding walls of the female member undergo periodic deformation: they flex outward during insertion to accommodate the male member, then return to their original position to provide locking force. This periodic action sequence ensures both easy insertion and strong, secure connection, resolving the contradiction between insertion ease and joint strength.
Solution Approach 2:
The flexible upstanding walls are designed to temporarily deform and absorb insertion forces before the male member is fully seated. This beforehand cushioning protects the joint structure during assembly while ensuring strong final connection, maintaining both insertion ease and joint strength.
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 snap-fit joint improves manufacturability and construction efficiency while maintaining sufficient strength, enabling the creation of robust and cost-effective plastic frame elements.
Implementation Method 1
The socket is substantially defined by opposite upstanding walls one of which can be temporarily flexed outwardly away from the socket
Implementation Method 2
The upstanding walls of the socket and the opposite sidewall of the male member include co-acting surfaces which temporarily contact each other during insertion of the male member into the socket of the female member to temporarily outwardly flex the upstanding wall of the socket
Implementation Method 3
When the male member is fully seated in the socket, the co-acting surfaces are out of contact with each other, the upstanding wall of the socket returns to an unflexed condition
Implementation Method 4
the tabs of the upstanding walls of the socket are received in the recesses of the sidewall of the male member to lock the male member within the socket
Data Source
AI summary
A snap-fit joint for connecting frame members includes a male member having an insertion end, a top portion, and opposite sidewalls. A female member has a socket to receive the male member insertion end. The socket includes an upstanding wall that temporarily flexes outwardly. Co-acting surfaces of the upstanding socket wall and the male member sidewall include co-acting surfaces in temporarily contact during insertion of the male member into the female member socket to temporarily outwardly flex the upstanding socket wall and seat the male member. The socket wall terminates in a tab and the male member sidewall surface terminates in a recess. The male member is fully seated in the socket, and the co-acting surfaces are out of contact with each other, the upstanding socket wall returns to an unflexed condition, and the socket tab is received in sidewall to lock the male member within the socket.