Grass Trimmer Wheel Assembly Mounting Positions

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Solution Overview

Problem

Existing grass trimmers require separate wheel assemblies for trimming and edging modes, increasing production costs, weight, and user inconvenience, as they cannot perform both functions simultaneously.

Innovation Solution

A grass trimmer design with a wheel assembly that can be mounted in two positions, allowing the wheels to rotate 360° for trimming and be fixed for edging, reducing the need for dual wheel assemblies and enhancing user comfort by allowing simultaneous trimming and edging functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a wheel assembly is mounted on both the working head and the guard for trimming and edging modes, then the grass trimmer can be supported and guided in both modes reducing user fatigue, but the structure increases production cost, manufacturing cost, transportation cost, and weight

Engineering Contradiction:
Improveuser comfortVSAvoidgrass trimmer weight
Core Design Contradiction:
Ease of operationVSWeight of moving object

Solution Approach 1:

The wheel assembly is designed with a bracket that can be mounted at two different positions: on the guard for trimming mode (wheel axis perpendicular to cutting axis) and on the working head for edging mode (wheel axis parallel to cutting axis). This universal design allows a single wheel assembly to serve both trimming and edging functions, eliminating the need for separate wheel assemblies for each mode.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Ease of operation

If a wheel assembly is mounted on both the working head and the guard for trimming and edging modes, then the grass trimmer can be supported and guided in both modes reducing user fatigue, but the structure increases production cost, manufacturing cost, and transportation cost

Engineering Contradiction:
Improveuser comfortVSAvoidproduction cost
Core Design Contradiction:
Ease of operationVSEase of manufacture

Solution Approach 1:

The wheel assembly is designed with a bracket that can be mounted at two different positions: on the guard for trimming mode (wheel axis perpendicular to cutting axis) and on the working head for edging mode (wheel axis parallel to cutting axis). This universal design allows a single wheel assembly to serve both trimming and edging functions, eliminating the need for separate wheel assemblies for each mode.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Ease of operation

If a wheel assembly is mounted on both the working head and the guard for trimming and edging modes, then the grass trimmer can be supported and guided in both modes reducing user fatigue, but the structure increases transportation cost

Engineering Contradiction:
Improveuser comfortVSAvoidnumber of wheel assemblies
Core Design Contradiction:
Ease of operationVSQuantity of substance

Solution Approach 1:

The wheel assembly is designed with a bracket that can be mounted at two different positions: on the guard for trimming mode (wheel axis perpendicular to cutting axis) and on the working head for edging mode (wheel axis parallel to cutting axis). This universal design allows a single wheel assembly to serve both trimming and edging functions, eliminating the need for separate wheel assemblies for each mode.

Inventive Principle:
Principle #6Universality (Multi-functionality)

4Ease of operation

If a wheel assembly is mounted on both the working head and the guard for trimming and edging modes, then the grass trimmer can be supported and guided in both modes reducing user fatigue, but the structure increases the weight and brings inconvenience to the user

Engineering Contradiction:
Improveuser comfortVSAvoidstructure complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The wheel assembly is designed with a bracket that can be mounted at two different positions: on the guard for trimming mode (wheel axis perpendicular to cutting axis) and on the working head for edging mode (wheel axis parallel to cutting axis). This universal design allows a single wheel assembly to serve both trimming and edging functions, eliminating the need for separate wheel assemblies for each mode.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentEP2805599B1Power cutting tool
Publication Date: 2018.11.07 POSITEC POWER TOOLS (SUZHOU) CO LTD
  • EP2805599B1 patent drawingFigure 1
  • EP2805599B1 patent drawingFigure 2
  • EP2805599B1 patent drawingFigure 3

AI summary

A power cutting tool includes a housing, a motor accommodated in the housing, a cutting assembly being operational in a trimming mode or in an edging mode and being driven by the motor to rotate around a first axis, a handle assembly, an elongated shaft connecting the cutting assembly and the handle assembly, a guard mounted to the cutting assembly, and a wheel assembly including a wheel. The wheel assembly is optionally mounted at least a first mounting position and a second mounting position. The central axis of the wheel is substantially perpendicular to the first axis when the wheel assembly is mounted at the first mounting position and is substantially parallel to the first axis when the wheel assembly is mounted at the second mounting position.