Deck Lift Assembly Two-Part Pedal Height Locking
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Solution Overview
Problem
Riding lawn mowers face challenges in balancing ease of operation and robustness in adjusting cutting deck height, as engine vibration and rough terrain can loosen or reposition the height settings, making it difficult to maintain stability and selected heights.
Innovation Solution
A robust and easy-to-use deck lift assembly with a multi-purpose operating assembly that allows operators to lock and unlock the height adjustment assembly, transitioning it into and out of a transport mode, using a two-part pedal system to control state/mode shifts and height selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a height adjustment assembly is made easy to operate, then ease of operation is improved, but robustness and stability deteriorate
Solution Approach 1:
The height adjustment assembly incorporates a two-part pedal system with a first pedal for height selection and a second pedal for locking/unlocking. This dynamic, multi-stage operation allows the system to transition between different states (adjustment mode vs. locked mode), providing ease of operation during adjustment while ensuring robustness when locked, thereby resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The operating assembly is divided into two distinct pedals: a first pedal for selecting cutting height and a second pedal for locking/unlocking the position. This segmentation separates the adjustment function from the locking function, allowing each component to be optimized independently - the first pedal provides ease of operation for height selection, while the second pedal ensures robustness through a deliberate locking action.
2Reliability
If the height adjustment assembly is made robust, then stability is improved, but ease of operation deteriorates
Solution Approach 1:
The system dynamically transitions between adjustment mode (when first pedal is actuated) and locked mode (when second pedal is actuated). This dynamic state change allows the assembly to be easy to operate during height selection while maintaining robust stability once locked, resolving the contradiction between stability and ease of operation.
Solution Approach 2:
The first pedal performs a preliminary action of selecting the desired height position before the second pedal executes the final locking action. This preliminary selection step simplifies the overall operation by separating height choice from locking, making the robust locking mechanism easier to operate through a staged process.
3Adaptability or versatility
If the cutting deck height is made adjustable, then adaptability is improved, but stability under vibration and rough terrain deteriorates
Solution Approach 1:
The height adjustment assembly allows the cutting deck to be dynamically adjusted to different heights for adaptability, while the two-part pedal system with locking mechanism ensures stability when locked. The system transitions between adjustable state and locked state, resolving the contradiction between adaptability and stability under vibration and rough terrain conditions.
Data Source
AI summary
A riding lawn care vehicle may include a frame, a power unit, and a cutting deck. The frame may be operably coupled to wheels of the riding lawn care vehicle. The power unit may be operably coupled to the wheels to provide drive power to the wheels. The cutting deck may be selectively powered by the power unit and operably coupled to the frame via a height adjustment assembly. The height adjustment assembly may be configured, based on actuation of an operating assembly, to be selectively transitioned into and out of a locked state in which the cutting deck is retained at a selected height, and selectively transitioned out of a transport mode.