Handle Control Arrangement for Lawn Mower Grass Collector Access
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Solution Overview
Problem
Walk-behind lawn mowers with grass collectors face difficulties in efficiently and safely removing the collector due to its weight and limited space, often requiring awkward detachment procedures.
Innovation Solution
A handle control arrangement with a pivoting mechanism and control wire system allows the handle assembly to pivot for easy access to the grass collector, using the same control wire for blade inhibition and locking, reducing components and costs, and enabling safe operation by locking the handle in the working position during blade activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the grass collector is detached and lifted through the handle assembly, then the grass collector can be emptied, but the procedure becomes awkward due to weight and limited space
Solution Approach 1:
The handle assembly is made dynamically controllable through a locking mechanism that transitions between locked and unlocked states. The control arrangement allows the handle to be fixed during operation for stability, then easily released when collector removal is needed, adapting the system's rigidity to operational requirements.
Solution Approach 2:
A control wire acts as an intermediary element connecting the actuating member on the handle assembly to the locking member on the body. This intermediary mechanism transmits the operator's input force to release the locking engagement, enabling easy handle pivoting without directly manipulating heavy components.
2Reliability
If the handle assembly is locked in working position during blade activation, then operator safety is improved, but handle pivoting is restricted
Solution Approach 1:
The locking mechanism provides dynamic control over handle position, transitioning between a locked state during blade operation for safety and an unlocked state when position adjustment is needed. The control arrangement enables the operator to switch between these states as required.
Solution Approach 2:
The control arrangement provides tactile feedback to the operator through the control wire and actuating member, indicating when the locking mechanism is engaged or disengaged. This feedback ensures the operator knows the handle is secured during blade activation.
3Device complexity
If the same control wire is used for blade inhibition and locking, then device complexity is reduced, but control function integration increases
Solution Approach 1:
The control wire serves dual functions by connecting the actuating member to the locking member, integrating both blade inhibition and handle locking controls into a single mechanical linkage. This merging reduces the number of separate control components and simplifies the overall system.
Solution Approach 2:
The control wire acts as a universal control element that performs multiple functions: transmitting operator input to release the locking mechanism, controlling blade inhibition, and coordinating handle position changes. This multi-functionality reduces system complexity while maintaining operational versatility.
Data Source
Figure 1
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Figure 2B
AI summary
A walk-behind lawn mower comprising a body with an engine driving a cutting blade, and a handle assembly which is pivotably connected to the body. The lawn mower furthermore comprises a handle control arrangement for controlling pivotal movement of the handle assembly relative to the bod, between a working position and a pivoted position. The handle control arrangement comprises a locking member, selectively displaceable between an open state in which the locking member allows pivotal movement of the handle assembly from the working position to the pivoted position, and a locked state in which the locking member inhibits pivotal movement of the handle assembly from the working position to the pivoted position. The handle control arrangement also comprises an actuating member operatively connected to the locking member and controlling the state of the locking member. The actuating member is also arranged to control activation and deactivation of a device arranged to inhibit rotation of the cutting blade of the walk- behind lawn mower.