Lawn Mower Cover Unlocking via Pivot Axis Translation
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Solution Overview
Problem
The existing lawn mower designs with covering devices are complex to manufacture due to multiple movable parts, requiring a latch to be displaced transversely for unlocking, which complicates the production and increases wear and maintenance.
Innovation Solution
The cover is designed to move relative to the housing along the pivot axis for unlocking, eliminating the need for a separate latch, and incorporates a spring assembly for automatic closure, simplifying the design and reducing wear, with a torsion or axial spring acting between the cover and housing to ensure the cover is locked in the closed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch is used for unlocking the cover, then the cover can be securely locked, but the device complexity increases and manufacturing becomes more complex
Solution Approach 1:
The latch is extracted from the cover and integrated into the housing instead. The housing now contains the locking mechanism that directly engages with the cover, eliminating the need for a separate latch component attached to the cover. This reduces the number of parts and simplifies manufacturing while maintaining secure locking.
Solution Approach 2:
The locking function is merged with the housing structure rather than being a separate component on the cover. The housing integrates the locking mechanism that works in conjunction with the cover's movement, combining multiple functions into fewer components and reducing overall device complexity.
2Ease of operation
If multiple movable parts are used in the covering device, then the locking and unlocking functions can be achieved, but wear increases and maintenance requirements increase
Solution Approach 1:
The movable latch is extracted from the system and its function is achieved through the cover's own movement relative to the housing. The cover moves directly to engage and disengage the locking mechanism in the housing, eliminating the need for a separate movable latch and reducing the number of wear-prone components.
Solution Approach 2:
The cover itself performs the unlocking function through its movement, without requiring a separate latch mechanism. The cover's displacement in the direction of the pivot axis automatically engages or disengages the locking feature in the housing, making the system simpler and more reliable.
3Ease of operation
If the cover is pivotable about a pivot axis, then the cover can open and close the discharge opening, but additional locking mechanism is needed to secure the closed state
Solution Approach 1:
The locking function is merged with the pivot mechanism. The housing contains a locking feature that engages with the cover during its pivoting motion, combining the opening/closing function with the locking function in an integrated manner rather than using separate mechanisms.
Solution Approach 2:
The complex latch mechanism is extracted and replaced with a simpler locking feature integrated into the housing that works with the cover's natural pivoting motion. The locking function is achieved through the relative movement between cover and housing rather than through a separate latch system.
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
This design simplifies the manufacturing process, reduces wear, and minimizes maintenance by eliminating the need for multiple movable parts, ensuring the cover automatically locks and closes, preventing operation with the cover open.
Implementation Method 1
the covering device comprises a spring assembly
Implementation Method 2
the spring assembly comprises a torsion spring that is part of the restoring device
Implementation Method 3
the spring assembly comprises an axial spring which is part of the locking device and is acting between the housing and the cover in the direction of the pivot axis
Data Source
AI summary
A lawn mower is provided with a housing that has a discharge opening for discharging cut material. A covering device is arranged at the housing and is provided with a cover and a locking device. The cover can pivot about a pivot axis. The cover covers the discharge opening in a closed state of the cover and opens the discharge opening in an open position of the cover. In the closed state of the cover, the cover can be locked by the locking device in a locked position of the cover. The cover is moveable relative to the housing in a direction of the pivot axis. The cover is unlocked from the locked position of the cover by a movement of the cover in the direction of the pivot axis.