Blind Rivet Connecting Head With Undercut Retention
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Solution Overview
Problem
Existing blind rivet constructions are prone to loosening under axial pulling forces due to radially outer knurling, leading to unreliable connections between the functional head and add-on parts.
Innovation Solution
A blind rivet design featuring an integrally configured functional flange with a connecting head, where the connecting head is molded to the flange, providing a form-fit or combined form-fit and force-fit connection, and featuring a mushroom-shaped or disc-like configuration with an axial undercut to ensure secure retention and prevent loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If radially outer knurling is used on the functional head, then the connecting structure can be arranged on the structured surface, but the connection is prone to loosening under axial pulling forces
Solution Approach 1:
The patent divides the functional head into two distinct parts: a structural head portion and a connecting head portion. The connecting head is separable from the structural head, allowing independent optimization of each part. This segmentation enables the connecting head to be specifically designed for secure attachment to add-on parts while the structural head maintains the blind rivet function, thereby resolving the contradiction between ease of manufacture and connection reliability.
2Ease of operation
If a plate-like edge is used to support the blind rivet, then the rivet can be supported at the component, but the connection reliability under pulling forces is insufficient
Solution Approach 1:
The patent separates the support function (plate-like edge on structural head) from the connection function (connecting head with retention features). This allows the plate-like edge to provide simple support while the connecting head provides reliable attachment through undercuts and form-fit connections, resolving the contradiction between ease of operation and connection reliability.
Solution Approach 2:
The patent introduces radial undercuts and axial retention features on the connecting head that extend beyond the simple plate-like support. These dimensional additions create form-fit connections and retention mechanisms that prevent loosening under pulling forces, transforming the single-dimensional support into a multi-dimensional secure connection 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
The design ensures a stable and secure retention of the connecting head on the functional flange, preventing loosening and providing a reliable connection between the blind rivet and add-on parts, even under mechanical loads.
Implementation Method 1
a pulling force applied on the pulling mandrel generates the formation of a closing head by deforming the sleeve section
Implementation Method 2
the connecting head is molded to the functional flange so that a connection between the blind rivet and an add-on part can be established
Data Source
AI summary
Disclosed is a blind rivet including the following features: a sleeve section which at a fastening end of the sleeve section is expandable with a pulling mandrel, a functional flange which is integrally configured with the sleeve section at a functional end of the sleeve section opposite to the fastening end and which extends radially beyond the sleeve section, and a connecting head which is molded to the functional flange so that a connection between the blind rivet and an add-on part can be established.