Trimmer Head Automatic Spool Replacement Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current trimmer heads require manual operations and are cumbersome when replacing the cutting wire spool, as they need to be disassembled and the winding-reel manually rotated for complete rewinding.
Innovation Solution
A trimmer head design featuring a casing with interlocking disks and a spring mechanism that automatically switches between engagement and free positions using centrifugal force to unwind the cutting wire, allowing for quick and easy spool replacement without disassembly, utilizing a compact and lightweight spool configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual rotation of the winding-reel is used for complete winding of the fresh spool, then the cutting wire spool can be rewound, but the operation is rather long and cumbersome
Solution Approach 1:
The winding-reel is designed to automatically wind the cutting wire onto the spool using the rotational motion already present in the trimmer head during operation. The system serves itself by utilizing the existing rotational energy to perform the winding operation, eliminating the need for separate manual winding actions and reducing the overall time and complexity of spool replacement
Solution Approach 2:
The cutting wire is pre-attached to the spool in such a way that when the spool is inserted, the wire is already positioned to be wound onto the reel. The system prepares the winding configuration in advance, so that upon insertion and activation, the winding process begins immediately without requiring preliminary manual positioning or setup
2Ease of operation
If the head is disassembled for spool replacement, then the spool can be accessed, but the operation becomes more complex and time-consuming
Solution Approach 1:
The trimmer head is divided into separable components, with the spool and winding-reel assembly designed as an accessible module that can be quickly removed and replaced without disassembling the entire head. This segmentation allows the spool replacement operation to be performed independently and simplifies the overall process
Solution Approach 2:
The spool and winding-reel are designed to be extractable from the head as a unit or individually accessible components. The cutting wire spool can be removed from the casing through dedicated openings or access points, allowing replacement without full disassembly of the head structure
3Ease of manufacture
If a traditional winding-reel design is used, then the cutting wire can be wound, but the device becomes heavier and less compact
Solution Approach 1:
The spool is designed to be nested within or integrated with the winding-reel structure, with the cutting wire wound in a compact configuration that fits within the available space. The spool and reel are arranged in a nested or space-efficient manner, reducing the overall volume and weight of the moving components while maintaining full winding functionality
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
Simplifies and speeds up the replacement of cutting wire spools by enabling automatic unwinding and easy detachment of the spool, maintaining a compact and lightweight design.
Implementation Method 1
a spring mechanism that automatically switches between engagement and free positions
Implementation Method 2
The automatic cutting wire unwinding device is activated as a result of the increased centrifugal force acting on one or more masses suitably placed inside the head
Data Source
AI summary
A trimmer head that includes a casing to be coupled to a driveshaft. The casing includes an upper shell and a lower shell, with the lower shell including a second toothing that protrudes upwardly. The trimmer head further includes an upper disk and a lower disk within the casing, with the lower disk including a first toothing that protrudes downwardly. A spool of cutting wire is positioned between the lower disk and the upper disk. In an engagement position, the first toothing and the second toothing are engaged and the upper disk and lower disk rotate with the lower shell. In a free position, the first toothing and the second toothing are disengaged and the upper disk and lower disk rotate with respect to the lower shell.