Blind Nut Multi-Diameter Tube for Uniform Buckling
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Solution Overview
Problem
Existing blind nuts struggle to be easily mounted in panels with a wide range of thicknesses without forming abnormal deformed portions, as the length of the tube-shaped portion often leads to inconsistent buckling, making it difficult to secure reliably across varying thicknesses.
Innovation Solution
A blind nut design featuring a tube-shaped portion with a cylindrical straight portion and a tapered portion, where the boundary diameter between the straight and tapered portions is enlarged, ensuring consistent buckling and secure mounting across different panel thicknesses, with a taper angle between 1 to 20° and specific length ranges for the straight and tapered portions to prevent buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the length of the tube-shaped portion is increased to accommodate thicker mounted members, then the blind nut can be mounted in thicker panels, but the tube-shaped portion does not buckle uniformly and abnormal deformed portions are formed
Solution Approach 1:
The tube-shaped portion is divided into multiple sections with different diameters: a large-diameter section, a small-diameter section, and a medium-diameter section. This segmentation allows different portions to buckle at different stages during mounting, ensuring uniform buckling across the entire tube-shaped portion regardless of its total length, thereby preventing abnormal deformed portions.
Solution Approach 2:
Different sections of the tube-shaped portion are given different local qualities (diameters) to control the buckling behavior. The large-diameter section buckles first, followed by the small-diameter section, and finally the medium-diameter section. This local quality variation ensures that the entire tube-shaped portion buckles uniformly even when the total length is increased to accommodate thicker mounted members.
2Manufacturing precision
If the length of the tube-shaped portion is decreased to prevent abnormal buckling, then uniform buckling is achieved, but the blind nut cannot be mounted in mounted members with larger thicknesses
Solution Approach 1:
The tube-shaped portion is segmented into multiple diameter sections that can buckle in sequence. This allows the overall length to be extended for thicker mounted members while maintaining buckling uniformity through controlled sequential buckling of different sections.
Solution Approach 2:
The buckling process is made dynamic through the sequential engagement of different diameter sections. As the tube-shaped portion is compressed, the large-diameter section buckles first, then the small-diameter section, and finally the medium-diameter section, creating a progressive buckling pattern that maintains uniformity across varying lengths.
3Adaptability or versatility
If a single type of blind nut is used for mounted members with a wide range of thicknesses, then inventory complexity is reduced, but inconsistent buckling occurs across different thicknesses
Solution Approach 1:
The blind nut design with multi-section tube-shaped portion achieves universality by accommodating mounted members with a wide range of thicknesses using a single blind nut type. The segmented structure allows the same blind nut to buckle uniformly whether the mounted member is thin or thick, eliminating the need for multiple blind nut variants.
Solution Approach 2:
The blind nut maintains buckling consistency across different mounted member thicknesses by changing the buckling parameters (which section buckles and when) based on the applied compression force and mounted member thickness. The multi-diameter design allows the buckling behavior to adapt to different thicknesses while maintaining uniformity.
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 reliable and consistent mounting of blind nuts in panels of varying thicknesses, preventing buckling issues and ensuring high release strength, thus securely fastening the nut to the panel without forming abnormal deformed portions.
Implementation Method 1
the tube-shaped portion 13 buckles to become an enlarged-diameter portion 17
Implementation Method 2
a section of the tube-shaped portion is plastically deformed to enlarge the diameter
Data Source
AI summary
A blind nut mountable in mounted members such as panels of a wide range of thicknesses. The blind nut includes an internal threading portion, a hollow tube-shaped portion adjacent to the threading portion, and an open flange formed in the tube-shaped portion on the end opposite the internal threading. The internal threading portion and the tube-shaped portion are inserted into a mounting hole in a mounted member, and a section of the tube-shaped portion is plastically deformed to enlarge the diameter in order to grip the mounted member between the deformed enlarged-diameter portion and the flange, and mount the blind nut in the mounted member. The tube-shaped portion has a tapered portion adjacent to the internal threading portion, and a cylindrical straight portion adjacent to the flange. The tapered portion and the straight portion are plastically deformed to widen their diameter and mount the blind nut on the mounted member.