Ergonomic Trimmer Shaft Tube with Segmented Diameter for Grip and Strength
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Solution Overview
Problem
Conventional string trimmers, pole hedge trimmers, and pole saws lack operational safety and ergonomics, leading to frequent injuries and fatigue due to poorly designed shaft tubes and handles that can slip during use, causing accidents and discomfort.
Innovation Solution
A trimmer design featuring a shaft tube with a smaller diameter portion for the front handle, providing a secure grip and reducing compressive force vulnerability, combined with an ergonomic handle configuration to prevent fatigue and enhance safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shaft tube and drive shaft are made longer and with bigger diameter to provide more strength and reach higher vegetation, then the strength and reach are improved, but the handle diameter increases making it difficult to grip and causing it to slip from the user's hand
Solution Approach 1:
The shaft tube is segmented into two distinct diameter portions: a first portion with larger diameter for strength and a second portion with smaller diameter for ergonomic handle grip. This segmentation allows each portion to optimize for its specific function without compromise.
Solution Approach 2:
Different portions of the shaft tube have different diameters tailored to their specific functions. The first portion has larger diameter where structural strength is needed, while the second portion has smaller diameter where user grip is needed, applying local quality to resolve the contradiction.
2Stability of the object's composition
If the shaft tube diameter is increased to prevent crushing by compressive forces, then the structural integrity is improved, but the handle becomes harder to grip securely
Solution Approach 1:
The shaft tube is divided into segments with different diameters - the first portion maintains larger diameter for crush resistance while the second portion reduces diameter for secure handle grip, resolving the contradiction between integrity and operability.
Solution Approach 2:
The shaft tube applies different dimensional characteristics to different locations: larger diameter where structural integrity is critical and smaller diameter where user interaction occurs, optimizing both integrity and grip.
3Reliability
If training and protective equipment are used to reduce injuries, then injury protection is improved, but the trimmer itself remains unsafe and can still cause injuries when the user is fatigued
Solution Approach 1:
The invention converts the potential harm of handle slippage into benefit by designing a shaft tube with optimized diameter that prevents slippage through improved ergonomics, transforming a safety hazard into a safety feature.
Solution Approach 2:
The shaft tube design proactively prevents handle slippage before it can cause injury by optimizing the diameter for secure grip, taking preliminary action to counteract the potential harmful effect of slippage during fatigued operation.
Data Source
AI summary
A trimmer which is suitable for cutting vegetation such as plants, bushes, hedges and trees. The trimmer includes a motor housing, a shaft tube enclosing a drive shaft, a front handle provided at the shaft tube, an electric motor as well as a cutting unit. The shaft tube which carries the front handle includes a portion which has a smaller diameter than the rest of the shaft tube. The trimmer is ergonomic and has higher operational safety than conventional trimmers. Moreover, the shaft tube, and drive shaft enclosed within the shaft tube, can't be crushed by compressive forces.