Lawnmower Grass Box Lid Automatic Opening Mechanism
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Solution Overview
Problem
Existing lawnmowers require multiple actions and often damage lids when emptying and replacing the grass collection box, as removable lids are cumbersome and lids attached to the housing necessitate two-handed operations.
Innovation Solution
A lawnmower design where lifting the grass box off the housing automatically opens the lid, allowing one-handed removal and replacement, with a bias mechanism ensuring the lid moves between open and closed positions stably, and a catch to hold the lid in place until the grass box is replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lid is removable from the grass box, then the grass box can be emptied, but the lid requires separate handling and is easily damaged
Solution Approach 1:
The lid is merged with the housing structure through pivotal attachment, creating a unified assembly that eliminates separate lid handling. The lid becomes an integrated part of the housing-lid-grass box system, where opening the lid is combined with the grass box removal action, reducing the number of separate operations required and minimizing lid damage risk.
2Ease of operation
If the lid is attached to the grass box, then the lid remains with the grass box, but the lid encumbers emptying and is liable to damage
Solution Approach 1:
The lid is segmented from the grass box and attached to the housing instead, creating functional separation. This allows the lid to remain attached to a stable structure (housing) while the grass box becomes a separate removable component, eliminating the encumbrance of lid attachment during grass box handling and reducing damage risk.
3Ease of operation
If the lid is pivotally mounted on the housing, then the lid can be opened, but two hands or two movements are required to remove the grass box
Solution Approach 1:
The lid opening action and grass box removal action are merged into a single coordinated movement. As the user lifts the grass box vertically, the lid simultaneously pivots open on its hinge, combining two previously separate operations (opening lid + removing grass box) into one fluid motion that requires only one hand and one primary action.
4Ease of operation
If the lid is spring loaded into closed position, then the lid closes automatically, but multiple-handed actions are required to replace the grass box
Solution Approach 1:
Instead of the spring forcing the lid closed requiring the user to first open it manually, the system is inverted so that the grass box itself becomes the actuating mechanism. When the grass box is placed into position, it automatically pushes the lid closed through mechanical engagement, reversing the traditional spring-lid-closing action into a grass-box-initiated closing action that simplifies replacement.
Data Source
Figure 1~2
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AI summary
A lawnmower having a housing (1) and a grass box (2), the housing (1) supporting the grass box (2), the lawnmower further comprising an lid (8) mounted on the housing (2) and having a closed position and an open position, the lid (8) overlying the grass box (2) in the closed position, in which the grass box (2) is removable from the housing (1) by lifting it off the housing, and the action of lifting the grass box (2) off the housing (1) causes the lid to move from the closed position to the open position. The grass box (2) may be transparent or translucent for viewing the grass level inside therethrough.