Notch Lock Height Adjustment for Rotary Mower Stability
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Solution Overview
Problem
Existing height of cut adjustment mechanisms for rotary cutting decks on golf course rough mowers are not rugged, reliable, or cost-effective, and fail to provide stability during shocks and varying cutting heights.
Innovation Solution
A height of cut adjustment mechanism featuring a pair of pivotable height of cut arms with axles and a notch lock system that allows for multiple cutting height settings, providing stability and shock absorption through a lever-operated locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing height of cut adjustment mechanisms are used, then the structure is simple, but the mechanism is not rugged and fails to provide stability during shocks
Solution Approach 1:
The height of cut adjustment mechanism is divided into separate functional components: height of cut arms, notch locks, slots, and lever systems. Each component performs a specific function, allowing the mechanism to be rugged and stable while maintaining reasonable complexity through modular design
Solution Approach 2:
The notch lock system with engaged notches and slots provides pre-established locking positions that absorb and withstand shocks before they can cause instability. The mechanism is designed to anticipate and counteract impact forces through its locking geometry
2Reliability
If a rugged and stable height of cut adjustment mechanism is implemented, then reliability improves, but the mechanism becomes more complex and expensive
Solution Approach 1:
The notch lock system is designed to automatically engage and lock the height of cut arms at predetermined positions without requiring additional actuators or complex control systems. The lever-operated mechanism allows operators to easily switch between locked and unlocked states, providing self-servicing capability that enhances reliability without excessive complexity
Solution Approach 2:
The mechanism provides discrete height of cut positions through notches at different elevations. By changing the vertical position parameter of the notches, the system achieves multiple stable cutting heights while maintaining a relatively simple locking structure
3Adaptability or versatility
If multiple cutting height settings are provided, then adaptability improves, but the mechanism complexity increases
Solution Approach 1:
The height of cut arms and notch lock system serve multiple functions: they simultaneously provide structural support for the cutting deck, enable height adjustment through lever operation, and maintain locked positions at various cutting heights. This multi-functionality achieves adaptability without proportionally increasing complexity
Solution Approach 2:
The mechanism transitions between dynamic (unlocked, adjustable) and static (locked, stable) states through lever operation. This dynamic capability allows the system to adapt to different cutting height requirements while maintaining simplicity through a single degree of freedom for adjustment
Data Source
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AI summary
A height of cut adjustment mechanism is provided for a rotary cutting deck (100) mounted on a lift arm extending from a traction vehicle (101). The mechanism includes a front axle and a rear axle (110, 112), at least one roller (108) mounted on each axle (110, 112), and a pair of height of cut arms (114) extending from each axle (110, 112) to a pivot axis on the rotary cutting deck (100). A notch lock (128) on each height of cut arm (114) may be moved between a locked position in which the notch lock (128) engages a notch plate (132) at a desired cutting height, and an unlocked position in which the notch lock (128) disengages the notch plate (132) so that the height of cut arm (114) can pivot with respect to the rotary cutting deck (100). A lever (130) attached to each notch lock (128) can be operated to move the notch lock (128) between the locked and the unlocked positions.