Lawn Mower Discharge Containment Slide Device
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Solution Overview
Problem
Existing lawn mowers experience uneven distribution of grass clippings in the container near the discharge opening, leading to inefficiencies and increased noise and energy consumption.
Innovation Solution
A lawn mower design featuring a slide device that adjusts the distance between the grass clippings discharge passage and the container's end surface, allowing for gradual increase in distance as clippings accumulate, reducing uneven distribution and minimizing the need for increased cutter blade speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grass clippings are discharged into a container with a fixed distance between the discharge opening and the end surface, then the structure is simple, but uneven distribution of grass clippings occurs in the vicinity of the opening
Solution Approach 1:
The patent applies the dynamics principle by making the distance between the discharge opening and the end surface adjustable rather than fixed. The expandable extension portion allows the container to change its configuration dynamically, expanding to increase the distance as grass clippings accumulate, thereby preventing uneven distribution while maintaining structural simplicity.
2Productivity
If the cutter blade rotation speed is increased to increase blow speed for better clippings discharge, then discharge performance improves, but noise increases and energy consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameter of the container (the distance between the discharge opening and the end surface) rather than changing the operational parameter of the cutter blade speed. The expandable extension portion allows this distance to be adjusted, improving discharge efficiency by allowing clippings to accumulate away from the opening without requiring increased blade speed, thus avoiding increased noise and energy consumption.
3Manufacturing precision
If the distance between the discharge opening and the end surface is increased to reduce uneven distribution, then clippings accumulate more evenly, but the container structure becomes more complex
Solution Approach 1:
The patent applies the nested doll principle by incorporating the expandable extension portion within the container structure. The extension portion is nested inside the container body and can expand outward when needed, allowing the container to increase its effective distance between the discharge opening and end surface without significantly increasing overall structural complexity. The extension portion integrates with the existing container geometry.
Data Source
AI summary
A lawn mower includes a cutter blade that cuts grass; a body portion including a housing containing the cutter blade, and a grass clippings discharge passage that discharge grass clippings cut by the cutter blade from the housing; a grass clippings container detachably attached to the body portion, and a slide device. The grass clippings discharge passage includes an upstream opening connected to the housing, and a downstream opening for ejecting grass clippings to outside of the body portion. The grass clippings container includes an opening opened toward the body portion and connected to the body portion, an end surface facing the opening, and a side surface extending from the opening to the end surface. The slide device adjusts a distance between the downstream opening of the grass clippings discharge passage and the end surface of the grass clipping container.