Retracting Guard for Lawn Mower Blade Assembly
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Solution Overview
Problem
Existing land clearing devices require operators to manually lift and position them to open the blade guard, which is inefficient and poses safety risks during cutting operations.
Innovation Solution
A pivotally connected blade guard that uses the forward motion of the land clearing device to open by pushing against an object, utilizing a linkage assembly to pivot the guard from a closed to an open position, allowing for enhanced blade exposure and debris deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guard is manually lifted and positioned to open, then the blade guard can be opened, but operator effort is required and safety risks increase
Solution Approach 1:
The guard opens automatically using the forward motion of the land clearing device itself. The linkage assembly converts the horizontal pushing motion against an object into vertical pivoting motion that opens the guard, eliminating the need for manual intervention and reducing safety risks.
Solution Approach 2:
The guard transitions from a static closed position to a dynamic open position through the linkage assembly. The system uses the kinetic energy and motion of the moving land clearing device to automatically actuate the guard opening mechanism.
2Productivity
If the guard is opened vertically against a tree, then the blade is exposed for cutting, but the device must be raised off the ground first
Solution Approach 1:
The linkage assembly enables the guard to pivot vertically while the device remains on the ground. The mechanism transforms the horizontal pushing force into vertical motion, allowing the blade to be exposed without requiring the entire device to be lifted off the ground.
Solution Approach 2:
The linkage assembly acts as an intermediary mechanism between the guard and the pushing force. It converts the horizontal force applied to the guard into vertical pivoting motion, enabling blade exposure without direct manual lifting of the device.
3Ease of operation
If the guard is held open manually, then the blade is accessible, but continuous operator intervention is needed
Solution Approach 1:
The guard opens and remains open automatically during cutting operations using the forward motion of the device. The linkage assembly maintains the guard in the open position as long as forward motion continues, eliminating continuous operator intervention and reducing time loss.
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 solution maximizes blade utilization and optimizes debris deflection by automatically opening the guard during cutting operations, reducing operator effort and enhancing safety by maintaining debris away from the operator.
Implementation Method 1
The guard is pivoted from its closed position to its open position using a linkage assembly which moves the guard to its open position when the front of the guard is pushed generally horizontally against an object
Implementation Method 2
The guard falls back to its closed position when force is no longer present between the guard and the object
Data Source
AI summary
An improved blade guard for a land clearing device such as a lawn mower or brush cutter. The land clearing device generally comprises a blade assembly having a plurality of spinning cutters covered by a housing. A guard having a closed position and an open position is pivotally combined with the front of the housing. In its closed position, the guard covers a portion of the blade assembly. In its open position a portion of the blade assembly is exposed to allow the cutters to perform land clearing operations. The guard is pivoted from its closed position to its open position using a linkage assembly which moves the guard to its open position when the front of the guard is pushed against a solid object. The guard falls back to its closed position when force is no longer present between it and the solid object.