Rotating Handle Control for Lawn Mower Ergonomics

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Solution Overview

Problem

Current self-propelled lawn mowers have an operating element positioned inconveniently, making it difficult for users to operate while gripping the handle.

Innovation Solution

A handle device with a first operating element that can rotate about a first axis parallel to the handle, allowing users to conveniently operate the lawn mower while gripping, and additional elements for adjusting the handle's angle and folding for storage and transport.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the operating element is disposed at a fixed position on the handle, then the structure is simple, but the user cannot operate it conveniently while gripping the handle

Engineering Contradiction:

Improveconvenience of operating elementVSAvoidhandle device structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The operating element is designed to rotate about a first axis relative to the handle, transforming it from a static component to a dynamic one. This rotation capability allows the operating element to move between a first position (accessible when gripping the handle) and a second position (exposed for operation), resolving the contradiction between ease of operation and structural simplicity.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If the operating element is exposed for operation, then it is accessible, but it may interfere with the user's grip on the handle

Engineering Contradiction:

Improveaccessibility of operating elementVSAvoidinterference with grip

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The rotating operating element can be positioned in a first position that does not interfere with the user's grip on the handle, and only moves to an exposed second position when needed for operation. This dynamic positioning eliminates the harmful interference while maintaining accessibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The operating element is pre-positioned in a retracted first position that is clear of the grip area, preventing interference before the user even attempts to grip the handle. It only moves to the operational second position when the user intentionally actuates it.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10433478B2Lawn mower and hand pushed power tool

Publication Date: 2019.10.08 CHERVON HK LTD WANCHAI

AI summary

A lawn mower includes a cutting element for cutting grass, a motor for driving the cutting element to rotate, a housing for containing the motor and a handle device for a user to control the lawn mower. The handle device includes a handle including a gripping portion for the user to grip and a connection portion substantially extending along a direction of a first line, and a first operating element for the user to operate. The first operating element is capable of rotating about a first axis relative to the handle. The first axis is substantially parallel to the first line.