Hedge Trimmer Tapping Body Waved Edge Dirt Prevention
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Solution Overview
Problem
Existing hedge trimmer heads with 'tap and go' mechanisms suffer from dirt penetration into the casing due to vacuum effects during rotation, leading to mechanical obstruction and reduced functionality.
Innovation Solution
A tapping body with a projecting edge having a waved or stepped profile is integrated into the design, which surrounds the side portion concentrically and protrudes radially, effectively preventing dirt entry by increasing pressure and reducing aerodynamic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slot is maintained between the edge of the lower opening and the outer surface of the tapping body to ensure clearance, then the tapping body can move freely to enable the 'tap and go' mechanism, but dirt enters the casing through the slot during rotation causing mechanical obstruction
Solution Approach 1:
A flexible seal element is introduced between the tapping body and the casing to close the slot during rotation. The seal element can deform to accommodate the tapping body's movement while maintaining contact to prevent dirt ingress, thus resolving the contradiction between free movement and dirt protection.
Solution Approach 2:
The seal element acts as an intermediary between the tapping body and the external environment. It mediates by allowing the tapping body to move freely while simultaneously blocking the slot to prevent dirt from entering the casing during rotation.
2Ease of operation
If the tapping body is pressed against the ground to release the anchoring device, then the reel can rotate to unwind the cutting wire, but strong vacuum is produced during head rotation that attracts dirt into the casing
Solution Approach 1:
The flexible seal element closes the slot between the tapping body and casing during rotation, preventing the vacuum effect from attracting dirt into the casing while still allowing the reel to rotate freely for wire unwinding.
Solution Approach 2:
The seal element converts the harmful vacuum effect into a beneficial sealed environment. By sealing the slot, the vacuum is contained and can no longer attract external dirt, while the internal mechanism continues to function normally.
3Object-affected harmful factors
If a seal is added to prevent dirt from entering the casing, then dirt penetration is blocked, but the mechanism complexity increases
Solution Approach 1:
A simple flexible seal element is used instead of complex sealing mechanisms. The seal's flexibility allows it to accommodate the tapping body's movement while maintaining a closed slot, providing effective dirt prevention with minimal added complexity.
Solution Approach 2:
The flexible seal element is self-adjusting and requires no additional actuation or control mechanisms. It automatically maintains contact to seal the slot while accommodating the tapping body's movement, thus preventing dirt ingress without increasing operational 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 prevents dirt from entering the casing, maintaining the functionality of the 'tap and go' mechanism while reducing noise and aerodynamic effects, thus ensuring continuous operation without mechanical obstruction.
Implementation Method 1
effectively preventing dirt entry by increasing pressure
Implementation Method 2
During rotation of the head occurring relative to said slot, a strong vacuum is produced which attracts dirt inside the casing
Data Source
Figure 1~1a
Figure 2~2a
Figure 3~3a
AI summary
A tapping body for a head for hedge trimmer comprising a lower portion (2), destined to be tapped or pressed onto the ground, and a side portion (3) which is so structured as to be arranged through a lower opening (11) of a casing (10) of the head; a projecting edge (4), which protrudes externally to the side portion (3) and is provided with a lower waved profile (41).