Seat Isolation Hinge Assembly for Adjustable Lawn Mower Ride Comfort
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Solution Overview
Problem
Traditional seat isolation systems in riding lawn mowers are inadequate for operators at extreme ends of the size spectrum, as they rely solely on pre-loading springs for adjustment, which is insufficient for optimal comfort and vibration isolation.
Innovation Solution
A vibration isolation assembly with a motion ratio adjustment mechanism that decouples the seat's displacement from pre-loaded compression, allowing for independent adjustment of the isolation system's motion ratio, coupled with a hinge assembly for effective vibration isolation and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional seat isolation systems use pre-loaded springs for adjustment, then the isolation system can be adjusted for different operators, but the adjustment is inadequate for operators at extreme ends of the size spectrum
Solution Approach 1:
The patent applies dynamics by making the motion ratio adjustable rather than fixed. The motion ratio adjustment assembly allows the isolation system to dynamically adapt to different operator sizes and weights by changing the mechanical advantage ratio between seat displacement and spring compression, enabling adequate isolation performance across the full spectrum of operator sizes.
Solution Approach 2:
The patent changes the parameter of motion ratio independently from pre-load compression. By introducing a separate adjustment mechanism for motion ratio (distinct from pre-load adjustment), the system can optimize isolation performance for different operator sizes without being constrained by the limited range of pre-load adjustment alone.
2Strength
If the seat is rigidly mounted to the frame, then the structure is simple and strong, but vibrations and bumps are directly transmitted to the operator
Solution Approach 1:
The patent introduces an isolation assembly as an intermediary between the seat and the vehicle frame. This assembly includes springs and a motion ratio adjustment mechanism that decouple the seat from direct rigid connection to the frame, allowing vibration isolation while maintaining structural integrity through the hinge assembly's robust connection to the frame.
Solution Approach 2:
The patent segments the seat mounting system into distinct functional components: the hinge assembly provides structural attachment to the frame, while the isolation assembly with springs and motion ratio adjustment provides vibration isolation. This segmentation allows each component to optimize its specific function without compromising the other.
3Ease of operation
If the seat isolation system is highly adjustable for different operators, then comfort is improved, but the device complexity increases
Solution Approach 1:
The patent merges the motion ratio adjustment functionality with the existing pre-load adjustment mechanism in an integrated adjustment assembly. This consolidation allows both motion ratio and pre-load to be adjusted through a unified structure, reducing overall device complexity compared to having separate independent adjustment systems for each parameter.
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
The solution provides enhanced vibration isolation and comfort for operators of varying sizes by allowing for adjustable motion ratios, independent of pre-loaded compression, thereby improving the overall riding experience and space efficiency.
Implementation Method 1
an isolation assembly including a spring element and a motion ratio adjustment assembly
Implementation Method 2
provide vibration isolation between the frame and the seat mounting structure
Data Source
AI summary
A riding lawn care vehicle (10) may include a frame (60, 130) to which wheels (31, 32) of the riding lawn care vehicle (10) may be attachable, a seat (20, 110, 310) which an operator of the riding lawn care vehicle (10) may utilize when operating the riding lawn care vehicle (10), a seat mounting structure (120, 320) to which the seat (20, 110, 310) may be mounted, an isolation assembly (140, 340) which may provide vibration isolation between the frame (60, 130) and the seat mounting structure (120, 320), and a hinge assembly (150, 350) which may enable the seat (20, 110, 310) to pivot via the seat mounting structure (120, 320). The isolation assembly (140, 340) may include a motion ratio adjustment assembly (160, 360) which may define a motion ratio of the isolation assembly (140, 340) independent of an amount of pre-loaded compression. The isolation assembly (140, 340) may be operably coupled to the seat mounting structure (120, 320) via the hinge assembly (150, 350) such that displacement of the seat (20, 110, 310) may be transferred to the isolation assembly (140, 340) via the hinge assembly (150, 350).