Strimmer Head Wire Loading via Curved Reel Channel
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Solution Overview
Problem
Existing strimmer heads require disassembly or the use of separate tools to replace the cutting wire, which is inconvenient and inefficient.
Innovation Solution
A strimmer head design with a cylindrical internal reel and flanges that allows wire insertion and winding without disassembly, using a curved entry and exit channel that exploits the wire's elastic memory for easy loading and winding without external tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head is disassembled to replace the wire, then the wire can be replaced, but the operation becomes complex and time-consuming
Solution Approach 1:
The reel is nested within the head casing, allowing the wire to be fed through the casing and wound onto the internal reel without removing the head from the tool. This nesting arrangement enables wire replacement while maintaining head assembly integrity.
Solution Approach 2:
The reel is extracted as a separate component that can be independently accessed and operated within the head assembly. This allows the wire winding operation to be performed on the extracted reel without disassembling the entire head structure.
2Ease of operation
If a separate wire-guide tool is used to insert the wire, then the wire can be inserted into the hub, but the device complexity increases
Solution Approach 1:
The reel hub is designed with self-aligning features including diametrically-opposite holes and a curved channel that automatically guide the wire into the correct position during insertion. The wire's own elasticity and the channel geometry work together to facilitate insertion without external guiding tools.
Solution Approach 2:
The curved channel in the reel hub provides a smooth, guided path for the wire insertion. The curvature of the channel naturally directs the wire from the entry hole through the hub to the winding space, eliminating the need for straight wire-guide tools.
3Productivity
If the reel is rotated manually to wind the wire, then the wire can be wound onto the reel, but the operation requires additional steps
Solution Approach 1:
The wire winding is achieved through periodic rotation of the reel. The user rotates the reel back and forth, and the wire is progressively wound onto the reel during each rotation cycle. This periodic motion simplifies the winding operation compared to continuous rotation.
Solution Approach 2:
The diametrically-opposite holes in the reel hub are pre-positioned to receive the wire ends before winding begins. This preliminary arrangement of the wire through the holes prepares the system for efficient winding by establishing the correct initial configuration.
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 easy and tool-free replacement of the cutting wire, simplifying the process and reducing wear on the reel, while maintaining efficient cutting performance.
Implementation Method 1
a curved entry and exit channel that exploits the wire's elastic memory for easy loading and winding without external tools
Implementation Method 2
Due to the centrifugal force acting thereon, when the head is set in rotation the ends of the wire are arranged in radial position such as to act as cutting blades for the vegetation
Data Source
Figure 1~3
Figure 4~6
AI summary
A strimmer head (10) comprising a cylindrical casing (13) provided with at least a diametrically-opposite pair of holes (14, 15) for entry and exit of a cutting wire (16), and a reel (20) located internally of the casing (13), which reel (20) can be rotated with respect to the casing (13), in which the reel (20) comprises a pair of flanges (21, 22) between which flanges (21, 22) a wall (23) is interposed in order to define, in cooperation with the flanges (21, 22), annular spaces (24, 25) each destined to wind a half of the wire (16). The wall (23) exhibits a wire guide channel comprising two portions (17, 28), being an entry portion and an exit portion for the wire (16), which portions (27, 28) are arranged in directions which do not pass through an axis of rotation of the reel (20).