Suspended Drive Wheel Layout for Stable Mobile Work Platforms
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Solution Overview
Problem
Existing mobile elevating work platforms (MEWPs) face challenges with controllability, stability, and predictability due to bulky designs and oversized elements, particularly when navigating uneven terrain or obstacles, and struggle to maintain performance when elevating beyond 3 meters.
Innovation Solution
A compact MEWP design featuring a chassis with fixed and caster wheels, a driving and steering wheel on suspension, and a telescoping mast system with cross members and V-shaped slide members, along with an ergonomic control implement, to enhance stability, traction, and ergonomic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a bulky design with oversized elements is used, then stability is improved, but controllability and predictability deteriorate
Solution Approach 1:
The patent changes the geometric parameters of the wheel arrangement, specifically positioning the driving wheel between the caster wheels and using a suspension system with spring elements. This parameter optimization allows the driving wheel to maintain better contact with the ground while reducing the overall footprint, thereby improving both stability and controllability simultaneously
2Length of moving object
If the MEWP is designed for elevation beyond 3 meters, then working height is improved, but structural complexity and component quantity increase
Solution Approach 1:
The mast is divided into multiple telescopic sections that can extend and retract independently. This segmentation allows the MEWP to achieve heights beyond 3 meters while maintaining a compact stored configuration and reducing the complexity of any single structural component
Solution Approach 2:
The telescopic mast sections are nested within each other, with smaller sections inside larger ones. This nesting arrangement enables the mast to extend to great heights when needed while occupying minimal space during storage or transport, and eliminates the need for complex external support structures
3Ease of operation
If two rear drive wheels turned in opposite directions are used, then steering capability is improved, but predictability of caster wheel movement deteriorates
Solution Approach 1:
The single driving wheel positioned between the caster wheels serves multiple functions: it provides directional control, maintains ground contact on uneven terrain through suspension, and enables predictable caster wheel movement. This multi-functional design simplifies the steering mechanism while improving overall system reliability
4Strength
If a square mast with telescopic cylinder is used, then rigidity is improved, but specific dimensions are required for elevation beyond 3 meters
Solution Approach 1:
The mast transitions from a static square tube design to a dynamic telescopic structure with multiple extendable sections. This allows the mast to adapt its length based on operational requirements, achieving elevation beyond 3 meters while maintaining rigidity through the telescopic mechanism and cross-member bracing
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 improves controllability, stability, and predictability, allowing for efficient operation on uneven terrain and enabling telescoping heights beyond 5 meters without performance reduction, while optimizing the compactness and ergonomics of the system.
Implementation Method 1
a driving wheel suspension secured between the driving and steering wheel and the chassis, wherein the driving wheel suspension is a spring
Data Source
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AI summary
A mobile elevating work platform includes a chassis (12) and fixed wheels, caster wheels, and a driving and steering wheel (18) secured to the chassis (12). A control implement (60) coupled with the driving and steering wheel (18) is configured to adjust a steering position of the driving and steering wheel (18). A drive motor (32) is operable to drive the driving and steering wheel (18). A platform (42) may be raisable and lowerable with a mast assembly (40). The control implement (60) may be adjustable to accommodate operator physical characteristics.