Precut String Container for Continuous Lawn Trimming

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Solution Overview

Problem

Existing lawn trimmers require users to carry additional string or stop work to refill, which is inefficient and time-consuming.

Innovation Solution

A reload string container that can be removably attached to the trimmer, storing multiple precut spools of string and protecting them from dirt, allowing direct feeding or spool replacement without the need for measurement or carrying extra string.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If users carry additional string or stop work to refill, then string availability is ensured, but work efficiency and time utilization deteriorate

Engineering Contradiction:

Improvestring availabilityVSAvoidwork efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The container pre-stores multiple spools of trimmer string, allowing users to quickly swap spools without stopping work. This preliminary preparation eliminates the need to carry string or return to storage locations during operation, maintaining both string availability and work efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The container serves as an intermediary storage system between the user and the trimmer string supply. Instead of directly carrying string or making frequent stops, the container mediates by holding multiple spools that can be rapidly exchanged, thus resolving the contradiction between availability and productivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If string is exposed during use, then accessibility is improved, but string quality deteriorates due to dirt and grass contamination

Engineering Contradiction:

Improvestring accessibilityVSAvoidstring contamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The container provides selective protection: the bulk storage area is enclosed to protect string from contamination, while the dispensing area remains accessible for operation. This local differentiation of quality (protected vs. accessible) resolves the contradiction between accessibility and contamination protection.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The container acts as an intermediary barrier that protects string from environmental contaminants while still allowing controlled access during string changes. The enclosure mediates between the harmful external environment and the string, permitting operation without direct exposure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Duration of action of moving object

If multiple spools are stored in the container, then string supply duration is extended, but container complexity increases

Engineering Contradiction:

Improvestring supply durationVSAvoidcontainer structure

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The container is segmented into compartments that can individually hold separate spools of string. This segmentation allows multiple spools to be stored in an organized manner, extending string supply duration while keeping the container structure manageable through modular division rather than a single complex space.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12376513B1Reload string container

Publication Date: 2025.08.05 LOCASCIO SR JESSIE M

AI summary

The present invention relates to containers for string for lawn trimming apparatuses. More particularly, the present invention relates to a reload string container which can store multiple, precut portions of string so as to allow a user to quickly reload a lawn trimming apparatus with new string when needed, without having to return to a storage location or without having to attempt to carry extra string on their person.