Blind Rivet Swaged Sleeve for Large Hole Fastening
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Solution Overview
Problem
Existing blind rivets are unable to effectively fasten components when the inner diameter of the mounting holes is greater than the outer diameter of the rivet's flange, and they cannot accommodate components with different hole diameters.
Innovation Solution
A blind rivet design featuring a hollow sleeve with a flange, a mandrel with a slender stem, and a washer, where the sleeve is swaged to form recessed and expanded portions, allowing the washer to be securely fitted, enabling the rivet to expand and accommodate larger diameters, and a method for assembling and using this rivet to fasten components with varying hole sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flange diameter of the rivet body is made smaller to reduce device complexity, then the rivet cannot fasten components when hole diameter exceeds flange diameter
Solution Approach 1:
The fastening system is divided into modular components: a standardized rivet body and interchangeable washers with different outer diameters. This segmentation allows the rivet body to remain simple while the washer provides adaptability to various hole diameters, resolving the contradiction between device complexity and versatility.
Solution Approach 2:
The washer serves multiple functions: it expands the effective fastening diameter beyond the flange diameter, provides different diameter options for various hole sizes, and maintains structural integrity. This multi-functionality allows a single rivet body design to handle diverse fastening requirements without increasing overall system complexity.
2Adaptability or versatility
If various rivet bodies with different flange diameters are prepared to accommodate different hole diameters, then adaptability improves, but device complexity increases
Solution Approach 1:
The system separates the diameter-adaptation function from the rivet body by using interchangeable washers with different outer diameters. This allows one standardized rivet body to work with multiple washer types, achieving versatility without multiplying rivet body variants.
Solution Approach 2:
The washer acts as an intermediary component between the rivet body and the workpiece. It mediates the size mismatch between the fixed flange diameter and variable hole diameters, enabling a single rivet body design to accommodate multiple hole sizes through washer selection.
3Reliability
If the outer diameter of the rivet body is made larger than the inner diameter of mounting holes, then fastening reliability improves, but the rivet cannot be used when hole diameter exceeds flange diameter
Solution Approach 1:
The washer extends the functional diameter of the fastening system beyond the flange diameter. By selecting washers with appropriate outer diameters, the system maintains reliable fastening (washer outer diameter > hole diameter) while adapting to various hole sizes, thus achieving both reliability and versatility.
Solution Approach 2:
The system dynamically adapts to different hole diameters by selecting appropriate washer sizes rather than relying on a fixed rivet body diameter. This dynamic configuration allows the fastening system to maintain optimal contact and clamping force for each specific application.
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
Enables the fastening of components with mounting holes larger than the rivet's flange diameter and allows for the use of different washers to accommodate various hole diameters, providing a secure and versatile fastening solution.
Implementation Method 1
a portion of the outer peripheral surface of the sleeve adjacent to the flange of the rivet body is swaged to form a recessed portion and an expanded-diameter portion
Implementation Method 2
The mandrel breaks off in the slender breakable portion of the stem
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The blind rivet for fastening together a plurality of mounted components with mounting holes comprises a rivet body (10) having a sleeve (11), a flange (12) and a through hole (13); a mandrel (20) having a slender stem (21) and a head (23); and a washer (30). The head (23) of the mandrel (20) is arranged adjacent to the sleeve-side end portion (14) of the rivet body (10), the stem (21) of the mandrel (20) is configured so as to extend through the rivet body (10), and the washer (30) is mounted near the flange (12) on the outer periphery of the sleeve (11) of the rivet body (10). A portion of the outer peripheral surface of the sleeve (11) adjacent to the flange (12) is swaged to form a recessed portion (16) so that the outer diameter in the other position is enlarged. The washer (30) is pushed onto the enlarged-diameter portion and secured. The mounted components are fastened together between an enlarged-diameter end portion of the sleeve (11) and the washer (30).