Rotating Head for Hedge Trimmers with Protected Male Connectors

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Solution Overview

Problem

Existing rotating heads for hedge trimmers are prone to detachment due to unwanted impacts on the exposed end portions of male connectors, posing a safety hazard during operation.

Innovation Solution

The rotating head design incorporates a protective peripheral wall that shields the male connectors, with a snap-fit engagement mechanism and a cover that ensures the connectors are protected from impacts, allowing safe operation and easy detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the end portions of male connectors are made accessible through the opening of the engagement seating to enable detachment of the rotating head, then the ease of operation is improved, but the reliability deteriorates due to exposure to unwanted impacts

Engineering Contradiction:

Improvedetachment of rotating headVSAvoidattachment stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The male connector is divided into two functional parts: a protected body portion housed within the support body, and an accessible end portion visible through the opening. This segmentation allows the critical connection interface to be protected while maintaining access for detachment operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The peripheral wall acts as an intermediary protective barrier between the male connector end portion and external obstacles. This wall shields the connector from unwanted impacts while allowing visual access and manual manipulation through the opening in the cover.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the male connectors are exposed through the opening for easy access, then the ease of operation is improved, but the object-affected harmful factors increase due to impacts against obstacles

Engineering Contradiction:

Improveaccess to male connectorsVSAvoidimpacts on male connectors

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The cover is designed with a specific opening pattern that provides localized access to the male connector end portions while maintaining protection in other areas. The peripheral wall provides localized shielding exactly where impacts are most likely to occur, creating a balanced solution between accessibility and protection.

Inventive Principle:

Principle #3Local quality

3Ease of repair

If the support body is divided into two half-shells with snap-fit engagements, then the ease of repair is improved, but the device complexity increases

Engineering Contradiction:

Improveaccess to bobbin of wireVSAvoidcoupling mechanism

Core Design Contradiction:

Ease of repairVSDevice complexity

Solution Approach 1:

The bobbin of wire and its associated components are extracted as a separate, removable unit from the support body. This allows the bobbin to be easily accessed, replaced, or maintained without disassembling the entire support body structure, simplifying repair operations despite the presence of snap-fit couplings.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8689451B2Rotating head for hedge trimmers

Publication Date: 2014.04.08 TECOMEC

AI summary

A rotating head for hedge trimmers, comprising: a support body (2, 3), predisposed to be fixed to a drive shaft of a hedge trimmer, which support body (2, 3) comprises a first half-shell (2) and a second half-shell (3), reciprocally and releasably couplable; at least a snap-fit engagement (4, 5), comprising a male connector (4) predisposed to snap-fit into an engagement seating (5); the male connector (4) is flanked to the internal side of a peripheral wall (31).