Lawnmower Cutter Housing Shutter Fence for Mode Conversion
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Solution Overview
Problem
Existing lawnmowers require labor-intensive and costly manufacturing and operation due to complex mulching conversion assemblies, and the process of converting between discharge and mulching modes is inconvenient and time-consuming.
Innovation Solution
A cutter housing assembly with a shutter fence made of steel slats that can be rotated between discharge and mulching positions using a roller cylinder, allowing for seamless conversion between modes without additional parts and interrupting the cutting operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a removable conversion assembly is used to switch between mulching and discharge modes, then the lawnmower can be converted between modes, but the conversion process is labor-intensive and time-consuming
Solution Approach 1:
The shutter fence is made movable rather than fixed, allowing it to dynamically change position between covering and uncovering the discharge opening. This enables rapid mode switching without removal or installation of components, resolving the contradiction between adaptability and conversion time.
Solution Approach 2:
The shutter fence is pre-positioned in a stored position where it can be quickly deployed to cover the discharge opening when needed. This preliminary positioning allows for rapid mode conversion without requiring complex assembly or disassembly operations.
2Ease of operation
If a movable mulching assembly is used instead of removable conversion assembly, then the conversion process is simplified, but additional components and complexity are introduced
Solution Approach 1:
The shutter fence is divided into multiple individual slats rather than being a single solid component. This segmentation allows the fence to be flexible and movable while using simple, standardized parts that reduce manufacturing complexity and assembly difficulty.
Solution Approach 2:
The shutter slats are curved to conform to the cylindrical roller cylinder. This curvature allows the slats to wrap around the roller naturally, enabling smooth movement and storage without complex mechanical linkages or additional support structures.
3Adaptability or versatility
If variable mulching system with multiple positions is implemented, then partial mulching and partial discharging is enabled, but the system complexity and cost increase
Solution Approach 1:
The shutter fence can be positioned at multiple locations along its travel path, allowing dynamic adjustment between full discharge, partial mulching, and full mulching modes. This continuous adjustability provides versatility without requiring discrete mechanical positioners or complex control mechanisms.
Data Source
AI summary
Various types of lawnmowers are disclosed that include at least one cutter housing having a chamber wall with a discharge opening therein. The mowers can include a rolling shutter formed of multiple steel sheets held together by pins. In discharge mode, the rolling shutter can be wrapped around a roller cylinder. In mulching mode the rolling shutter can extend to close off the discharge opening of the mower.