Trimmer Head Sealing Assembly for Debris-Protected Wire Release
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Solution Overview
Problem
The gap between the wire-releasing button and the fan blade of conventional trimmer heads allows lawn clippings and dust to enter, causing functional failure and cleaning difficulties.
Innovation Solution
A trimmer head design featuring a control assembly with a driving component, driven component, and elastic component, along with a sealing ring, to prevent debris entry and facilitate automatic wire release, using centrifugal force for resetting and a oblique string outlet for smoother operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a large gap is left between the wire-releasing button and the fan blade, then the structure is simpler and easier to manufacture, but lawn clippings and dust can easily enter the trimmer head causing functional failure and cleaning difficulties
Solution Approach 1:
A sealing ring is introduced as an intermediary element between the wire-releasing button and the fan blade. This sealing ring fills the gap and prevents lawn clippings and dust from entering the trimmer head, while still allowing the button to be pressed for wire release functionality.
Solution Approach 2:
The sealing ring is implemented as a flexible thin film element that can be compressed when the wire-releasing button is pressed. This flexible membrane maintains the seal to prevent debris entry while accommodating the mechanical action of button pressing for wire release.
2Object-affected harmful factors
If the wire-releasing button is positioned close to the fan blade, then debris entry is prevented, but the wire-releasing function may fail due to interference
Solution Approach 1:
The sealing ring serves as a mediator that allows the wire-releasing button to be positioned close to the fan blade for debris prevention while maintaining the wire-releasing function. The button can press against the sealing ring without interfering with the fan blade rotation.
Solution Approach 2:
The flexible sealing ring can be compressed by the button press, allowing close positioning for debris prevention while maintaining the mechanical action needed for reliable wire release. The flexibility ensures the button can move freely to release the wire.
3Object-affected harmful factors
If the sealing ring is tightly clamped to prevent debris entry, then debris prevention is improved, but the wire-releasing button may have difficulty pressing the sealing ring
Solution Approach 1:
The sealing ring is designed as a flexible thin film that can be easily compressed by the button press. This flexibility allows tight clamping for debris prevention while requiring minimal pressing force from the user to release the wire.
Solution Approach 2:
The sealing ring's physical state changes from a tight seal during normal operation to a compressed state during button pressing. This parameter change allows the seal to maintain its sealing function while accommodating the button action for wire release.
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
Prevents lawn clippings and dust from entering the trimmer head, improving usability and user experience by ensuring smooth operation and easy cleaning.
Implementation Method 1
the elastic component is capable of being elastically deformed along with a movement of the driven component
Implementation Method 2
when the trimmer head is running, the driven component is configured to slide toward a side away from the driving component under the action of centrifugal force
Implementation Method 3
when the trimmer head is running, the extruding part is configured to abut against the inner wall surface of the housing under an action of a centrifugal force and squeeze the sealing ring in different directions with the housing
Data Source
AI summary
A trimmer head includes a housing, a string reel and a control assembly. The housing is provided with passing holes communicated mutually and an assembly cavity for accommodating the string reel. The control assembly is clamped with the string reel and can control the string reel to rotate. The control assembly includes a driving component, a driven component and an elastic component. The driving component includes a pressing part, an extruding part, and a pushing part. When the pressing part is pressed, the pushing part pushes the driven component to detach from the string reel, the elastic component is squeezed, and the string reel rotates to release a wire. When the pressing part is released, the driving/driven components are reset under an action of the elastic component. A sealing ring is clamped between the housing and the extruding part.