Scissors Lift Vehicle Low Height Design
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Solution Overview
Problem
Scissors lift vehicles have a high work platform that is laborious to access due to the elevated position, requiring users to climb multiple steps, and the design limits access to narrow areas when fully retracted, as the mechanism is mounted on top of a carriage with equipment underneath.
Innovation Solution
The scissors lift vehicle features a chassis with parallel structural members, a lower-mounted base, and a scissors stack assembly with pivotally and slidably coupled linkages that allow for a lower profile, enabling the work platform to be positioned closer to the ground for easier access and allowing the vehicle to navigate through narrower spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the scissors lift assembly is mounted on top of a carriage with equipment underneath, then the lift mechanism can support heavy loads and maintain stability, but the height of the work platform is greatly elevated above the floor surface making access laborious
Solution Approach 1:
The patent inverts the conventional mounting arrangement by positioning the scissors lift assembly beneath the carriage instead of on top. This inversion allows the work platform to be positioned at a lower height for easier access while the lift mechanism remains capable of supporting heavy loads and maintaining stability through its structural design
2Reliability
If the scissors lift assembly is mounted on top of a carriage, then the lift mechanism can be properly positioned for operation, but the height of the scissors lift vehicle increases when fully retracted limiting access to narrow areas
Solution Approach 1:
By inverting the mounting arrangement and positioning the scissors lift assembly beneath the carriage, the patent reduces the overall vehicle height when retracted. This allows the vehicle to access narrow areas while maintaining proper mechanism positioning and operational reliability through the redesigned structural configuration
3Adaptability or versatility
If equipment is mounted under the scissors lift assembly on the carriage, then the lift can be self-propelled with integrated systems, but the height of the work platform is elevated requiring multiple ladder steps for access
Solution Approach 1:
The patent maintains the self-propelled capability and integrated equipment systems while inverting the mounting arrangement to position the scissors lift assembly beneath the carriage. This configuration reduces platform height to eliminate the need for multiple ladder steps, significantly improving accessibility while preserving the vehicle's operational versatility
Data Source
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AI summary
A scissors lift vehicle (100) includes a chassis (300), a first pair of wheels (312) disposed at one end of the chassis and a second pair of steering wheels (316) disposed at an opposite end of the chassis. The wheels include a circular profile (324) having a radius R. The scissors lift vehicle includes a track (324) having an upper surface (326) and a lower surface (328) extending aft at a height less than R above a travel surface (106). A pivot connection (332) is coupled to the aft plate at a height less than R above the travel surface. A scissors stack assembly (112) includes a plurality of paired scissors linkages (118). Each scissors linkage (334, 336) of a first pair of scissors linkages is coupled to a respective pivot connection (332). Each scissors linkage (340, 342) of a second pair of scissors linkages (334) includes a truck (346) coupled to a distal end (348). The truck is configured to engage the upper surface (326) of the track (324).