Riveting Device Mandrel Removal via Emergency Rotary Separation

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Solution Overview

Problem

Existing riveting devices face damage to thread arrangements during high setting forces, making it difficult to conventionally remove blind rivet elements, often resulting in damage to the rivet, workpiece, or device, and requiring time-consuming manual intervention like sawing or using tools.

Innovation Solution

An emergency program is initiated on the riveting device, using a rotary drive to separate the mandrel from the connecting element via an intact second thread arrangement, allowing for controlled removal of the mandrel even with damaged first threads, and enabling manual separation with tools if necessary.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional screwing off method is used to remove the mandrel, then the removal process can be completed, but it causes damage to the blind rivet element, workpiece, or riveting device when the first thread arrangement is damaged

Engineering Contradiction:

Improvethread arrangement integrityVSAvoidmandrel removal difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent segments the thread arrangements into two distinct systems: a first thread arrangement (damaged, between mandrel and blind rivet element) and a second thread arrangement (intact, between mandrel and connecting element). By separating these functions, the removal process can utilize the intact second thread arrangement to avoid damage to the damaged first thread arrangement and associated components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connecting element acts as an intermediary component that provides an alternative removal path. Instead of directly screwing the mandrel off the blind rivet element through the damaged first thread arrangement, the system uses the connecting element with its intact second thread arrangement as a mediator to facilitate safe mandrel removal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If manual intervention like sawing or using tools is used to remove the mandrel, then the mandrel can be removed, but it is time-consuming and causes damage to the blind rivet element, workpiece, or riveting device

Engineering Contradiction:

Improvemandrel removal capabilityVSAvoidremoval time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The riveting device performs the removal operation itself using its own rotary drive and second thread arrangement, eliminating the need for external manual intervention such as sawing or specialized tools. The system serves itself by utilizing its built-in mechanisms to remove the mandrel in a controlled manner.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces aggressive mechanical removal methods (sawing, forcing with tools) with a controlled rotational mechanism using the intact second thread arrangement. This substitution allows for precise, damage-free removal without the need for destructive manual intervention.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If the torque of the motor is adjusted for undamaged threads, then the screwing operation works for undamaged threads, but it is insufficient when the thread is damaged and requires alternative removal methods

Engineering Contradiction:

Improvethread condition adaptabilityVSAvoidremoval operation simplicity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The second thread arrangement between the mandrel and connecting element serves multiple functions: it enables both the setting operation (screwing the mandrel into the blind rivet element) and the removal operation (screwing the mandrel off the connecting element). This multi-functionality allows the same intact thread arrangement to handle both installation and removal, adapting to different operational needs without requiring separate mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10220436B2Method for removing a blind rivet element from a riveting device

Publication Date: 2019.03.05 HONSEL DISTRIBUTION GMBH & CO KG

AI summary

A method for removing a blind rivet element from a riveting device. The riveting device includes a connecting device, a mandrel, a rotary drive which rotates the connecting element around a rotational axis of the connecting element, and a longitudinal drive which axially drives the connecting element relative to the rotational axis. The blind rivet element is screwed onto the mandrel of the riveting device. The mandrel is connected to the connecting element on the riveting device. The method includes starting an emergency program via a user input on the riveting device. The emergency program includes the steps of rotating the connecting element with the rotary drive in a rotating direction to separate the connection between the mandrel and the connecting element, and, upon reaching a default, stopping the rotation of the connecting element with the rotary drive.