Rotary Cutting Head Wire Locking Mechanism
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Solution Overview
Problem
Existing rotary cutting heads for brush cutters, grass trimmers, and hedge trimmers are restrictive due to manual operation requirements for wire replacement, wear and tear issues, and inefficiencies in wire usage, particularly with short wires and varying diameters or shapes.
Innovation Solution
A rotary cutting head with a hub and housing system featuring independent movable locking elements and a single elastic element for secure wire attachment, allowing for easy wire replacement and winding, with a design that accommodates both short and long wires, reducing unusable wire length and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single elastic element is used to actuate multiple locking elements, then the device complexity is reduced, but the reliability of wire locking may be compromised
Solution Approach 1:
The patent combines multiple locking elements (at least two) into a single integrated system actuated by one elastic element. The locking elements work together with the elastic element to secure the wire, creating a unified locking mechanism that reduces overall system complexity while maintaining reliability through the cooperative action of multiple components.
Solution Approach 2:
The locking system is segmented into independent locking elements that can individually engage with the wire, while being collectively actuated by a single elastic element. This segmentation allows each locking element to independently contribute to wire security, maintaining reliability while simplifying the actuation mechanism.
2Ease of operation
If movable locking elements are used for wire attachment, then the ease of operation for wire replacement is improved, but the device complexity increases
Solution Approach 1:
The movable locking elements are designed to be actuated by the user's manual intervention during wire replacement. The locking elements move independently to release and secure the wire, allowing the user to perform the replacement operation directly without complex external actuation mechanisms, thereby improving ease of operation.
Solution Approach 2:
The locking elements are made movable rather than fixed, allowing them to dynamically transition between locked and unlocked states. This dynamic capability enables easy wire replacement while the elements remain integrated into the housing, minimizing the increase in device complexity.
3Adaptability or versatility
If the head and support body are mounted in rotation relative to each other for winding, then the adaptability for long wire accommodation is improved, but the device complexity increases
Solution Approach 1:
The support body is designed to rotate relative to the housing, creating a dynamic winding mechanism. This rotational movement allows the support body to wind long wires around itself, providing adaptability for different wire lengths while using a relatively simple rotational joint rather than a complex winding mechanism.
Solution Approach 2:
The support body serves multiple functions: it holds the locking elements for wire attachment and simultaneously acts as a reel for winding long wires. This multi-functionality increases adaptability for different wire lengths without requiring separate dedicated winding components, thereby minimizing the increase in device complexity.
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
The solution enables rapid and efficient wire replacement, optimized wire usage, and reduced wear and tear, making the cutting head suitable for various wire sizes and shapes while minimizing the length of unusable wire.
Implementation Method 1
a single elastic element capable of exerting a stressing on the support face (11, 11') of each locking element (3, 3') making it possible to tighten and to lock each wire (5, 5')
Data Source
AI summary
The invention relates to a rotary cutting head with wires for a brush cutter, grass trimmer, edge trimmer, hedge trimmer or the like, said head comprising a housing (1) containing a supporting body (2) comprising a system (3, 3′, 4, 4′, 12) for blocking at least two cutting or shearing wires, and a peripheral wall (6) allowing the or each wire to be wound around said wall in said head. Said blocking system comprises at least two movable blocking elements (3, 3′) that are independent from each other and each associated with a clamping surface (4, 4′) built into the supporting body (2) and comprising a clamping face (10, 10′) and a supporting face (11, 11′), and a single elastic body (12) that can exert stress on each clamping face (11, 11′) for clamping and blocking each wire.