Plastic Roller Striper with Spring Force for Lawn Mower
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Solution Overview
Problem
Existing rotary cutting deck roller stripers are noisy and prone to damage when driving on paved surfaces, and lack operator control for easy engagement and disengagement, with grass clippings accumulating and causing unsightly patches on lawns.
Innovation Solution
A rotary cutting deck with a plastic roller striper mounted on a frame, pivotally handled for easy operation, using torsion springs for downward force and an angled scraper to prevent clippings accumulation, allowing quiet operation and reduced damage from curbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If metallic rollers are used to engage grass with sufficient force, then the roller can effectively lay cut grass down, but the roller becomes very noisy when rolling over paved surfaces
Solution Approach 1:
The patent changes the material parameter of the roller from metallic to plastic, which fundamentally alters the noise characteristic while maintaining the engagement function through spring force application
Solution Approach 2:
The patent introduces a spring mechanism that applies downward force to the plastic roller to compensate for its lighter weight, ensuring sufficient engagement force with the cut grass without requiring the roller to be heavy like metal
2Force
If metallic rollers are used to lay down cut grass, then effective striping is achieved, but the rollers can be dented or damaged when hitting curbs
Solution Approach 1:
The patent changes the material from metallic to plastic, which is more impact-resistant and less prone to denting when the mower encounters curbs or obstacles
Solution Approach 2:
The spring mechanism provides a cushioning effect by absorbing impact forces before they reach the plastic roller, protecting it from damage when encountering curbs
3Reliability
If fixed support brackets are used to mount the roller striper, then the roller is securely positioned, but the operator cannot easily put the roller into or take it out of operation
Solution Approach 1:
The patent transforms the fixed mounting into a movable arrangement where the roller can be easily raised and lowered through a handle mechanism, allowing dynamic control of engagement while maintaining stability when in use
Solution Approach 2:
The spring mechanism provides automatic downward force on the roller, eliminating the need for complex mounting brackets and allowing the operator to simply manipulate the handle for easy engagement and disengagement
4Force
If the roller is made heavy to engage grass effectively, then sufficient downward force is achieved, but the roller becomes more prone to damage from curb impacts
Solution Approach 1:
The patent uses a spring mechanism to provide the necessary downward force on the lightweight plastic roller, eliminating the need for the roller itself to be heavy while still achieving effective grass engagement
Solution Approach 2:
The patent changes the material from heavy metal to lightweight plastic, fundamentally altering the weight parameter while using spring force to compensate and maintain adequate engagement pressure
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
Enables easy operator control of the roller striper, reduces noise and damage, maintains effective grass striping with consistent force, and prevents clippings from accumulating on the roller.
Implementation Method 1
A spring acts between the cutting deck and the frame for pressing downwardly on the frame with a force sufficient to cause the plastic roller body to lay the cut grass down
Implementation Method 2
the roller bends the stems of the cut grass to lay the cut grass over
Data Source
AI summary
A rotary cutting deck has a roller striper along a rear side thereof. The roller striper comprises a pivotal frame that rotatably journals a roller made from a plastic roller body. Torsion springs surround the pivots for the frame. The springs put enough downforce on the plastic roller body to lay the cut grass over in a rearward direction as the cutting deck moves forwardly over the ground. The roller striper can be selectively moved into and out of engagement with the ground by a pivotal handle that can be manipulated by an operator from a seat of the lawn mower on which the cutting deck is installed.