Sleeved Connection Fastener for Thin Steel Plate Pull-Out Strength

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Solution Overview

Problem

Connection fasteners experience reduced pulling-out strength when driven into thin steel plates due to the formation of burring shapes, as the connection band attached to the fastener presses and crushes the burring shape, preventing it from adhering effectively.

Innovation Solution

A connection fastener design featuring a gap between the sleeve and the fastener, allowing the burring shape to form without hindrance, with a recess portion on the sleeve that facilitates easy crushing and absorption of impact, enhancing the holding power and preventing the reduction in pulling-out strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the connection band is attached closely to the fastener, then the fastener can be held stably in the injection path, but the burring shape is pressed down and crushed, reducing the pulling-out strength

Engineering Contradiction:

Improveholding stabilityVSAvoidpulling-out strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The sleeve's inner peripheral surface is segmented into two distinct regions: a first region with close contact to the fastener for stability, and a second region with a gap for burring formation. This segmentation allows the sleeve to simultaneously provide holding stability and allow burring growth without crushing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the sleeve's inner peripheral surface are given different properties: the first region has a close-contact configuration for stability, while the second region has a gap configuration for burring formation. This local differentiation resolves the contradiction between holding stability and pulling-out strength

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the sleeve is made rigid to maintain fastener posture, then the fastener remains vertical in the injection path, but the impact during driving is not absorbed, increasing deformation of the thin steel plate

Engineering Contradiction:

Improveposture stabilityVSAvoidimpact deformation

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The sleeve's structural parameters are optimized by creating a gap in the second region of the inner peripheral surface. This parameter change allows the sleeve to absorb impact energy through controlled deformation while maintaining posture stability through the close-contact first region

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If the sleeve is designed to crush easily to absorb impact, then the deformation of thin steel plate is reduced, but the holding power of the fastener is reduced

Engineering Contradiction:

Improvedeformation controlVSAvoidholding power

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The sleeve is segmented into a first region for stable holding and a second region for controlled crushing. This segmentation allows the sleeve to crush easily in the second region to absorb impact while maintaining holding power through the first region's close-contact design

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11624391B2Connection fastener

Publication Date: 2023.04.11 MAX CO LTD

AI summary

A connection fastener in which a plurality of fasteners for a driving tool are connected includes a connection band which detachably connects sleeves holding the fasteners one by one. A gap is formed between the sleeve and the fastener so as to face a toe side of the fastener.