Clamping Rivet Threaded Ring Spring Arm Blocking

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Solution Overview

Problem

Existing clamping rivets lack a secure pre-assembly position and effective blocking mechanism against unintentional loosening, especially when subjected to high pull-out forces.

Innovation Solution

A clamping rivet design featuring a threaded ring spirally extending around the base shaft, combined with spring arms and an insertion pin, allows for a pre-assembly position that secures against loosening and provides enhanced pull-out force resistance by blocking spring arm deflection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If only rear grip lugs are provided on the base shaft, then the structure is simple, but the pull-out force resistance is insufficient and unintentional loosening cannot be prevented

Engineering Contradiction:

Improvepull-out force resistanceVSAvoidstructure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The base shaft is segmented into functional zones: rear grip lugs for initial positioning, a threaded ring section for enhanced anchoring, and front grip lugs for final securing. This segmentation allows each component to contribute to pull-out resistance without requiring a completely redesigned structure, resolving the contradiction between strength and complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines multiple securing mechanisms (rear grip lugs, threaded ring with threads, and front grip lugs) into a single integrated base shaft structure. This merging provides cumulative pull-out force resistance while maintaining a unified component rather than requiring separate elements, addressing both strength and complexity concerns.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of operation

If spring arms are allowed to deflect radially inwards during assembly, then the insertion process is easier, but the pre-assembly position cannot be securely maintained

Engineering Contradiction:

Improveassembly easeVSAvoidpre-assembly position security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The spring arms are pre-configured with a blocking mechanism that prevents radial inward deflection at the pre-assembly position. This preliminary anti-action maintains security during positioning while still allowing controlled deflection during the final insertion stroke, resolving the contradiction between ease of operation and position security.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The spring arms transition from a blocked state (preventing deflection) during the pre-assembly phase to an unblocked state (allowing deflection) during final insertion. This dynamic behavior enables the system to provide security when needed and flexibility when required, resolving the contradiction between reliability and ease of operation.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the threaded ring extends only partially around the base shaft, then the device complexity is reduced, but the security against unintentional loosening is compromised

Engineering Contradiction:

Improvesecurity against looseningVSAvoidthreaded ring configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The threaded ring is configured to extend over a specific angular range (at least 120 degrees) of the base shaft circumference, providing localized anchoring security where most needed. This partial coverage maintains reliability against loosening while avoiding the complexity of a fully circumferential threaded ring, resolving the contradiction between security and complexity.

Inventive Principle:

Principle #3Local quality

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 secure pre-assembly position and high pull-out force resistance, with the threaded ring and spring arms working together to prevent radial deflection and provide reliable attachment and detachment mechanisms.

Implementation Method 1

a threaded ring 12, which extends spirally around a base shaft 3

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

threaded ring 12, which extends spirally around the base shaft 3 from a base end 11 facing away from the support plate 2 to at least the rear grip lug 10 closest to the mounting plate

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Fastener

Implementation Method 3

The spring arms 8, 9 are sufficiently flexible and free so that when a predetermined assembly force is exerted, the spring arms 8, 9 can deflect radially inwards

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 4

after the insertion pin has been pushed into the base shaft, the spring arms are then blocked against springing radially inwards

Methodology Applied

Scientific EffectMechanical blocking: Mechanical Fastener

Data Source

PatentEP2362107B1Tension rivet

Publication Date: 2015.03.04 A RAYMOND & CO SCS

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AI summary

The clamping rivet has an insertion body (1), which possesses a support disk (2) and a base shaft (3) connected with the support disk. The base shaft designed with two spring arms (8,9) having a rear handle nose (10). An insertion pin (14) is inserted into the base shaft against a deflection radially inwards for blocking the spring arms. A threaded ring (12) is formed at the base shaft, where the threaded ring extends from a base end (11).