Weed Trimming Head With Segmented Hub Channels

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Solution Overview

Problem

Existing weed trimmer heads require disassembly for replacing trimming lines, which is inconvenient and time-consuming.

Innovation Solution

A hub with integrated channels allows trimming lines to be slidably positioned, enabling quick removal and replacement without disassembly, with each line extending outwardly from the hub for trimming.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If trimming lines are compressed between portions of a hub, then the trimming lines are securely held, but replacement of trimming lines requires disassembly which is time-consuming

Engineering Contradiction:

Improveease of trimming line replacementVSAvoidtime for trimming line replacement

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The hub is segmented into multiple arms, each with its own integrated channel for receiving trimming lines. This segmentation allows individual trimming lines to be accessed and replaced independently without disassembling the entire hub structure, enabling quick replacement while maintaining secure holding.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The trimming lines are extracted from a compressed-between-parts configuration and placed into dedicated integrated channels within the hub arms. This extraction allows the trimming lines to be freely insertable and removable from the channels without requiring disassembly of the hub, solving the contradiction between secure holding and easy replacement.

Inventive Principle:

Principle #2Taking out (Extraction)

2Adaptability or versatility

If a mechanical engagement system is used for releasably engaging trimming lines, then trimming lines can be removed and reattached, but the system becomes complex requiring multiple components

Engineering Contradiction:

Improveability to remove and reattach trimming linesVSAvoidcomplexity of engagement mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The channel structure merges multiple functions into a single integrated component: it provides the engagement path for trimming lines, acts as the retention mechanism through its geometry, and eliminates the need for separate mechanical engagement components. This merging achieves adaptability for removal and reattachment while maintaining simplicity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated channels are designed to self-retain the trimming lines through their geometric configuration, eliminating the need for external mechanical engagement systems. The channels themselves provide the releasable engagement capability through their structure, allowing trimming lines to be inserted and secured without additional components.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11751504B2Weed trimming head assembly

Publication Date: 2023.09.12 BEEPUT GARNET

AI summary

A weed trimming head assembly includes a hub that has a plurality of arms each radiating outwardly between a central coupling and an outer ring. Each of the arms has a channel integrated into the arms and the channel extends between the central coupling and the outer ring. A plurality of trimming lines is provided and each of the trimming lines is slidably insertable into the channel in a respective one of the arms. Moreover, each of the trimming lines extends outwardly from the outer ring of the hub. In this way each of the trimming lines can trim grass when the hub is rotated by the weed trimmer.