Telescoping Handle Shock-Absorbing Mount Durability

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Solution Overview

Problem

Telescoping handle assemblies in mobile devices, such as wheeled tool storage devices, experience early failure due to shocks and impacts from varying terrain and weather conditions, leading to fatigue and fracture around the rivet, particularly in cyclic loading tests.

Innovation Solution

Incorporation of a shock-absorbing mount, such as a bushing made of urethane or soft plastic, positioned between the latch body and the handle sections to absorb and dampen shocks, increasing the durability and life of the handle assembly by reducing the impact magnitude as it passes through the assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a telescoping handle assembly is used to allow convenient transportation, then ease of operation is improved, but reliability deteriorates due to early failure from shocks and impacts

Engineering Contradiction:

Improveconvenient transportationVSAvoiddurability of latch mechanism

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

A shock-absorbing element is integrated into the latch assembly to preemptively cushion impacts and shocks transmitted from the wheel assembly through the handle sections. This beforehand cushioning prevents direct transmission of harmful forces to the latch mechanism, thereby maintaining reliability while preserving the telescoping handle's operational convenience

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The shock-absorbing element acts as an intermediary component positioned between the handle sections and the latch mechanism. It mediates the transmission of forces by absorbing and dampening shocks before they reach the latch, thus protecting the critical latching function while allowing the handle to maintain its telescoping mobility

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the handle assembly is designed for rugged use in various terrain conditions, then adaptability is improved, but strength deteriorates due to fatigue and fracture around the rivet

Engineering Contradiction:

Improveperformance in various terrain and weather conditionsVSAvoidresistance to fatigue and fracture

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The shock-absorbing element provides beforehand cushioning against the repeated impacts and vibrations encountered during rugged use on various terrains. By absorbing these shocks before they accumulate as fatigue stress around the rivet, the element preserves the structural strength needed to withstand adaptable rugged conditions

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If the latch assembly is positioned to secure the telescoping handle sections, then ease of operation is improved, but reliability deteriorates due to transmission of impacts through the latch body

Engineering Contradiction:

Improvelatch engagement and disengagementVSAvoidlatch body integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The shock-absorbing element serves as an intermediary between the handle sections and the latch body, intercepting and absorbing impacts before they transmit through the latch body. This protects the latch body's integrity while maintaining the ease of operation for engagement and disengagement

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shock-absorbing element provides beforehand cushioning to the latch body, preventing direct transmission of harmful impacts that would compromise latch integrity. This ensures reliable latch operation even when the handle is subjected to rough handling and terrain variations

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 shock-absorbing mount significantly enhances the handle assembly's durability and life, extending its performance beyond 30 miles in fatigue cyclic loading tests, reducing the likelihood of failure and improving overall structural integrity.

Implementation Method 1

a shock-absorbing mount positioned between the latch body and the one of the first handle section and the second handle section

Methodology Applied

Scientific EffectShock absorption: Damping

Implementation Method 2

absorb and dampen shocks, increasing the durability and life of the handle assembly by reducing the impact magnitude

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentUS9872547B2Handle assembly for a case

Publication Date: 2018.01.23 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A telescoping handle assembly, a mobile device, and a method of assembling a telescoping handle assembly for a mobile device. The handle assembly may include a first handle section, and a second handle section telescopingly arranged relative to the first handle section. The handle assembly may further include a latch assembly fixed to one of the first handle section and the second handle section and selectively engageable with the other of the first handle section and the second handle section. The latch assembly may include a latch body positioned between the first handle section and the second handle section and a shock-absorbing mount positioned between the latch body and the one of the first handle section and the second handle section.