Blind Rivet Multi-Section Design for Variable Clamping
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Solution Overview
Problem
Conventional blind rivets face challenges in achieving a wide range of clamping thicknesses without radial widening, which can lead to workpiece separation and leaks, and require manual prestressing force to ensure proper connection.
Innovation Solution
The blind rivet design incorporates a third forming section and a second intermediate section, allowing for the formation of multiple blind heads that adjust based on clamping thickness, ensuring axial clamping and reducing radial widening, thereby eliminating the need for manual prestressing and preventing workpiece separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the range of possible clamping thicknesses is increased, then the blind rivet can connect workpieces with different thicknesses, but the radial widening of the rivet sleeve increases causing material to be squeezed between workpieces
Solution Approach 1:
The blind rivet is divided into multiple forming sections (first forming section, second forming section, third forming section) with intermediate sections between them. Each forming section can independently deform to form blind heads at different positions, allowing the rivet to adapt to different clamping thicknesses without excessive radial widening. The segmentation enables controlled deformation at specific locations rather than uniform radial expansion.
Solution Approach 2:
Different sections of the blind rivet are designed with different deformation characteristics. The first intermediate section forms a blind head for greater clamping thicknesses, while the second intermediate section forms a blind head for smaller clamping thicknesses. This local differentiation allows each section to optimize its deformation behavior for specific thickness ranges, preventing unwanted radial squeezing.
2Reliability
If manual prestressing force is applied to ensure proper connection, then workpieces are drawn towards one another, but the operation complexity and time increase
Solution Approach 1:
The blind rivet automatically draws workpieces towards one another through its own deformation mechanism during the setting operation. As the pin is pulled off, it deforms the forming sections which in turn draw the workpieces together without requiring separate manual prestressing. The system performs the tightening function inherently through its structural design.
Solution Approach 2:
The forming sections are pre-configured in the blind rivet body to perform the drawing action automatically during setting. The first and second intermediate sections are designed to form blind heads that inherently pull workpieces together as they deform, eliminating the need for preliminary manual prestressing operations.
3Adaptability or versatility
If the rivet sleeve is radially widened to accommodate thicker workpieces, then clamping thickness range increases, but workpieces may burst open or leaks occur
Solution Approach 1:
The deformation is segmented into specific forming sections rather than uniform radial widening. The first forming section deforms to form a blind head for thicker workpieces, while the second forming section remains relatively intact for smaller thicknesses. This prevents uncontrolled radial expansion that could cause workpiece bursting or leakage.
Solution Approach 2:
The blind rivet changes its deformation parameters based on clamping thickness. For greater thicknesses, the first intermediate section deforms to form a blind head. For smaller thicknesses, the second intermediate section forms the blind head. This parameter change allows adaptation to different thicknesses without causing harmful radial widening effects.
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
This design enables reliable, rattle-free connections across varying thicknesses with reduced radial widening and eliminates the need for manual prestressing, enhancing the blind rivet's ability to connect workpieces efficiently and securely.
Implementation Method 1
This leads on the blind side to a deformation of the blind-side end of the sleeve shank and/or the formation of a blind head which, after setting, bears against the blind-side workpiece surface
Data Source
AI summary
A blind rivet having a rivet sleeve and a pin, the rivet sleeve having a sleeve head for contact with a visible-side workpiece surface and a sleeve shank and a through hole, through which the pin is guided, the pin having a blind-side pin head for contact in the region of a blind-side end of the sleeve shank, and the sleeve shank having a first forming section and a second forming section which is arranged axially spaced apart from the first forming section and closer to the sleeve head, a first intermediate section being formed between the first and the second forming section, which first intermediate section, during setting of the blind rivet, can form a first blind head which can be formed at axially different points in order to set up different clamping thicknesses.