Retractable Front Rollers for Drive-Over Mower Deck Scalping
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Solution Overview
Problem
Existing drive-over mower decks lack easily retractable front rollers that can be lowered and extended to prevent scalping during mowing, while allowing the deck to lay flat on the ground for easy vehicle passage.
Innovation Solution
A drive-over mower deck with retractable front rollers supported by a roller pivot bracket, which can be pivoted between a retractable and extended position using a front linkage, allowing the rollers to be lowered below the deck rim to prevent scalping and raised above the ground for vehicle passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If front rollers are extended below the deck rim to prevent scalping, then mowing performance on grass mounds and hills is improved, but the deck cannot lay flat on the ground for vehicle passage
Solution Approach 1:
The front rollers are made movable between an extended position (below the deck rim) for scalping prevention and a retracted position (above ground level) for vehicle passage. The roller pivot bracket allows the rollers to be positioned dynamically based on operational needs, resolving the contradiction between maintaining scalping prevention capability and enabling easy vehicle passage.
2Ease of operation
If front rollers are retracted above ground level for vehicle passage, then the deck can lay flat on the ground, but scalping prevention capability is lost
Solution Approach 1:
The system allows dynamic repositioning of the front rollers. When vehicle passage is needed, rollers are retracted above ground level. When mowing on grass mounds or hills, rollers are extended below the deck rim to prevent scalping. This dynamic adjustment capability resolves the contradiction between ease of vehicle passage and scalping prevention reliability.
3Reliability
If fixed front rollers are mounted on the deck, then scalping is prevented, but the deck complexity increases and vehicle passage becomes difficult
Solution Approach 1:
Instead of fixed rollers that would permanently increase deck complexity and interfere with vehicle passage, the invention uses movable rollers mounted on a pivot bracket. This allows the rollers to be extended only when needed for scalping prevention, reducing the effective complexity during normal operation while maintaining the reliability benefit when required.
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 efficient mowing on grass mounds and small hills by preventing scalping and allows easy installation and removal of the mower deck by allowing it to lay flat on the ground when driving over, without the need for additional height adjustment mechanisms.
Implementation Method 1
A front linkage is pivotably connectable between the drive-over mower deck and a tractor. The front linkage contacts the roller pivot bracket, forcing the roller pivot bracket from a retractable position to an extended position
Data Source
AI summary
A drive-over mower deck includes at least one retractable front roller which is pivotable between a lowered position extending forwardly and downwardly from a rim at a front and center of the drive-over mower deck, and a retractable position in which the front roller pivots freely between the lowered position and a retracted position when the drive-over mower deck lays flat on a ground surface.