Foamed Plastic Holding Structure for Low-Force Rod Attachment
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Solution Overview
Problem
Conventional plastic foamed articles require excessive force to securely attach to rod-shaped attaching portions due to mismatched dimensions, leading to loose attachments and increased labor burden during assembly.
Innovation Solution
A plastic foamed article with a holding portion featuring a pair of opposite surfaces and protrusions that elastically deform to securely hold the attaching portion, with the protrusions occupying 2-15% of the surface area and having a semicircular projection shape to facilitate easy attachment and prevent looseness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between opposite surfaces is made smaller than the attaching portion size to prevent looseness, then attachment reliability is improved, but the pushing force required increases significantly
Solution Approach 1:
The invention introduces protrusions at specific locations on the inner surface of the holding portion to create localized contact points with the attaching portion. This concentrates the clamping force at discrete points rather than requiring uniform compression across the entire surface, thereby reducing the total pushing force needed while maintaining secure attachment and preventing looseness.
Solution Approach 2:
The invention changes the geometric parameters of the holding portion by adding protrusions with specific dimensions (occupying 2-15% of the inner surface area). This modification alters the force distribution characteristics, enabling reliable attachment with reduced pushing force compared to a flat surface design.
2Reliability
If strong pushing force is applied to depress the attaching portion by predetermined depth, then attachment security is improved, but the labor burden on workers increases
Solution Approach 1:
By providing protrusions at specific locations on the inner surface, the invention creates localized contact points that concentrate the clamping force. This allows workers to achieve secure attachment with significantly reduced pushing force, thereby reducing the labor burden and making the assembly operation easier and less physically demanding.
3Reliability
If the protrusion area is increased to improve holding force, then attachment reliability is improved, but the space for the attaching portion is reduced
Solution Approach 1:
The invention optimizes the protrusion area parameter to occupy 2-15% of the inner surface area of the holding portion. This parameter range is carefully selected to provide sufficient contact area for reliable holding force while maintaining adequate space for the attaching portion to be properly inserted and positioned. The specific percentage range balances the competing requirements of holding force and available space.
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 design allows for easy and secure attachment of the plastic foamed article to rod-shaped attaching portions, reducing the required force and preventing looseness, thereby simplifying the attachment process and enhancing assembly efficiency.
Implementation Method 1
the protrusion being configured so that at least a part thereof is elastically deformed by the attaching portion in a state in which the attaching portion is held between the pair of opposite surfaces
Data Source
AI summary
Provided is a plastic foamed article to be attached to an attaching target having a rod-shaped attaching portion having a radial direction, the plastic foamed article including a holding portion for holding the attaching portion in the radial direction in a state attached to the attaching target, the holding portion including a pair of opposite surfaces facing each other for holding the attaching portion between the pair of opposite surfaces and a protrusion provided on one of the pair of opposite surfaces, and at least a part of the protrusion is configured to be elastically deformed by the attaching portion in a state in which the attaching portion is held between the pair of opposite surfaces.