How a Tool Automatically Installs Blind Rivet Nuts

This patent describes a method for a tool to automatically install a blind rivet nut by first pushing it against a surface, then rotating it, and finally pulling it back to deform and secure it.

What it covers

This patent describes a method for operating a blind rivet nut-setting tool. The process begins by pressing a blind rivet nut, which is held on the tool's output shaft, against a workpiece. This action applies an external force that pushes the output shaft backward along its longitudinal axis, moving it from a first position to a second position. Upon reaching this second position, the output shaft activates a limit switch. This activation triggers a first motor, which rotates the output shaft, causing the blind rivet nut to undergo plastic deformation. Following this, a second motor is activated to pull the output shaft further backward along the longitudinal axis, causing additional plastic deformation and permanently setting the blind rivet nut on the workpiece.

What it doesn't cover

• —Does not cover manual blind rivet nut installation tools that rely solely on operator force.
• —Does not cover tools that only rotate or only translate the output shaft, but not both in the described sequence.
• —Does not cover tools where the initial movement of the output shaft is not caused by pressing the nut against a workpiece.
• —Does not cover tools that do not use a limit switch to trigger the first motor's rotation.
• —Does not cover tools that perform the rotation and translation steps simultaneously rather than sequentially.

The clever bit

The clever bit is the automated, sequential operation: using the workpiece itself to trigger the initial shaft movement, which then activates a limit switch to engage a first motor for rotation, followed by a second motor for translation, ensuring precise and automated setting of the blind rivet nut.

Why it matters

Automated rivet nut setting can significantly speed up assembly processes in manufacturing environments. This method could improve consistency and reduce operator fatigue compared to manual tools, leading to more reliable fastening. It is particularly relevant for industries requiring high-volume fastening solutions where efficiency and precision are critical.

Real-world examples

• 1.Automotive assembly lines
• 2.Aerospace manufacturing
• 3.Sheet metal fabrication
• 4.Appliance manufacturing
• 5.Industrial machinery assembly
• 6.Construction equipment manufacturing