Power Head Barrier Member for Heat Dissipation
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Solution Overview
Problem
Portable handheld tools used for lawn maintenance, such as string trimmers and brush cutters, cause user fatigue due to extended use and heat from the engine, leading to potential injury from high temperatures.
Innovation Solution
A power head design with a housing featuring a barrier member that provides a localized area with heat dissipating or isolating properties, allowing for a reduced temperature contact point for the operator, reducing discomfort and fatigue during prolonged use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine housing is designed to meet temperature standards, then safety standards are satisfied, but the housing surface temperature becomes high enough to injure the operator during extended use
Solution Approach 1:
The patent applies local quality by adding a barrier member with heat dissipating or heat isolating properties to specific locations on the housing where operator contact occurs. This creates localized areas with different thermal characteristics - the barrier member areas have reduced temperature while the rest of the housing maintains its structural integrity and meets overall temperature standards.
Solution Approach 2:
The barrier member acts as an intermediary between the hot engine housing and the operator's body. It provides a thermal buffer that reduces heat transfer to the operator while allowing the housing to maintain its normal operating temperature. The barrier member mediates the thermal interaction, protecting the operator without requiring the entire housing to be cooled.
2Ease of operation
If the boom component is weighted to provide balance, then tool handling is improved, but the weighted component generates heat that can injure the operator during extended use
Solution Approach 1:
The barrier member is selectively positioned at the weighted portion of the boom where operator contact occurs during extended use. This localized approach maintains the necessary weight for balance while providing thermal protection only where needed - at the contact point between the weighted component and the operator's body.
3Strength
If the housing surrounds the engine completely, then engine protection is maximized, but heat dissipation to safe areas for operator contact is limited
Solution Approach 1:
Rather than modifying the entire housing structure, the patent applies local quality by adding barrier members with heat dissipating or isolating properties to specific exterior surfaces where operator contact is anticipated. This allows the housing to maintain its protective enclosure function while creating localized thermal management zones.
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 power head design offers improved comfort and reduced fatigue by providing a cooler contact area, enhancing operator experience and control during extended use periods.
Implementation Method 1
the barrier member includes at least one heat dissipating property
Implementation Method 2
the barrier member includes at least one heat dissipating property
Implementation Method 3
the barrier member includes at least one heat isolating property
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A portable handheld tool (10) having a power head (12) for powering a lawn maintenance implement (16) is provided. The portable handheld tool (10) may include a brush cutter, a blower, a vacuum, an edger, a polesaw, or the like. The power head (12) includes an engine (18) surrounded by a housing (20). The housing (20) includes a transition surface (30) having a heat dissipation and/or a heat isolating barrier member (34) extending therefrom for allowing the user to rest their forearm against the barrier member (34) during operation. The barrier member (34) providing a contact surface having localized cooling generated by heat dissipating and/or heat isolation properties of the barrier member (34).