Trimmer Head Line Loading Mechanism
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Solution Overview
Problem
Existing rotary trimmer heads require users to interrupt the connection between the spool and housing to load or unload cutting line, especially when line breakage occurs, which is inconvenient and time-consuming.
Innovation Solution
A rotary trimmer head design featuring a line receptor channel that allows cutting line to be loaded and unloaded without disconnecting the spool from the housing, utilizing a cam and cam follower mechanism for even winding and distribution, and a line receptor channel with open ends for easy access and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spool is disconnected from the housing to load or unload cutting line, then the line can be properly loaded or replaced, but the operation becomes inconvenient and time-consuming
Solution Approach 1:
The spool is divided into functional segments: a closed end for secure mounting to the housing, and an open end for easy line access. The line receptor channel is segmented with an accessible portion that exposes the cutting line without requiring spool disconnection, allowing users to load, unload, or replace line quickly while the spool remains connected to the housing.
2Manufacturing precision
If the cutting line is wound tightly on the spool, then the line distribution is even, but the line may tangle during winding
Solution Approach 1:
A line receptor channel acts as an intermediary structure between the cutting line and the spool winding surface. This channel guides the line along a predetermined path, ensuring even distribution and preventing tangling during the winding process. The channel's geometry controls line placement, maintaining manufacturing precision without causing harmful tangling effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and uniform loading and unloading of cutting line without interrupting the spool-housing connection, preventing tangling and facilitating line replacement without splitting the head, even during line breakage, thus improving user convenience and efficiency.
Implementation Method 1
utilizing a cam and cam follower mechanism for even winding and distribution
Data Source
AI summary
A trimmer head for a rotary line trimmer including a housing operatively connected to the trimmer and a spool for carrying cutting line thereon. The spool is operatively connected to the housing for rotation therewith and defines a pair of opposed line receptor channels having opposed open ends, traversing opposed portions of the spool and defining opposed outlet openings above a lowermost end of the spool. The channels can be aligned with the eyelets in the housing skirt such that lengths of cutting line can be inserted therethrough and wrapped about the spool upon relative rotation of the spool and housing without having to interrupt the operative connection therebetween. The channel outlet openings provide access to the inner ends of the line so that the line also can be pulled from the head without having to interrupt the operative connection therebetween.