Steering Assembly Height Adjustment With Single-Handle Locking
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Solution Overview
Problem
The existing steering assemblies for riding lawn mowers require multiple tools to adjust the height, leading to inconvenience and additional storage space, as users need to remove caps, loosen nuts, and tighten screws, making the process cumbersome.
Innovation Solution
A steering assembly with a steering tube and a screw that engages with a groove on a steering rod, utilizing a handle to rotate the screw into a tightened or loosened position, allowing for adjustable height without the need for multiple tools, using a nut and biasing member for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional adjustment mechanism with multiple tools is used, then secure coupling is achieved, but ease of operation deteriorates due to requirement of multiple tools and complex adjustment process
Solution Approach 1:
The patent combines multiple adjustment mechanisms into a single integrated system. The adjustment assembly integrates a screw, nut, and handle into one unified component that performs both loosening and tightening functions, eliminating the need for separate tools and simplifying the user interface.
Solution Approach 2:
The adjustment assembly is designed as a multi-functional component that can both loosen and tighten the steering rod coupling. The single handle mechanism serves multiple purposes: rotating the screw, engaging/disengaging the locking mechanism, and securing the steering rod at desired positions, replacing what previously required multiple specialized tools.
2Productivity
If traditional adjustment mechanism is used, then secure coupling is achieved, but loss of time increases due to cumbersome adjustment process
Solution Approach 1:
The steering rod includes pre-formed grooves that align with the screw mechanism. The grooves are positioned and shaped in advance to guide the screw during engagement, eliminating the need for manual alignment or positioning adjustments during the tightening process.
Solution Approach 2:
The adjustment mechanism is designed to be self-aligning and self-securing. When the handle rotates the screw, the grooves on the steering rod automatically guide the screw into proper engagement, and the spring-loaded nut automatically secures the position without requiring additional manual intervention or tool operations.
3Ease of operation
If single handle adjustment system is used, then ease of operation improves, but reliability may deteriorate due to simplified coupling mechanism
Solution Approach 1:
The screw features a conical or tapered geometry that provides progressive engagement with the grooves. This curved profile ensures smooth, gradual tightening that distributes stress evenly and prevents sudden failures, while the gradual engagement also makes the mechanism more tolerant of minor misalignments.
Solution Approach 2:
The spring-loaded nut acts as an intermediary element between the screw and the steering rod. It provides continuous pressure to maintain engagement, compensates for wear and dimensional variations, and ensures reliable coupling even when the screw-groove interface experiences stress or vibration during operation.
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 convenient and infinite adjustable height of the steering assembly with a single handle, reducing the need for multiple tools and storage space, while providing secure coupling and decoupling of the steering tube with the steering rod.
Implementation Method 1
The adjustment assembly includes a screw passing through a hole defined by the steering tube. The screw engages with the groove. The adjustment assembly includes a nut threadedly engaged to the screw
Implementation Method 2
using a nut and biasing member for secure engagement
Data Source
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AI summary
An adjustment system (204) for a steering assembly (124) having a steering tube (202) includes a steering rod (206) defining a groove (304). A screw (314) passing through a hole (312) defined by the steering tube (202) engages with the groove (304). A nut (328) located within the steering tube (202) threadedly engages the screw. A handle (320) is movably received on the screw such that the handle (320) selectively rotates the screw (314) in a first rotational direction (R1) to a tightened position in which the screw (314) engages with the groove (304) to couple the steering tube (202) with the steering rod (206). Further, the handle (320) selectively rotates the screw (314) in a second rotational direction (R2) to a loosened position in which the screw is disengaged from the groove (304) to allow the steering tube (202) to be movable with respect to the steering rod (206).