Staggered Extendable Trailer Steps With Automatic Pneumatic Control
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Solution Overview
Problem
Existing extendable/retractable step assemblies for flatbed trailers are often complex and bulky, encroaching on the payload carrying area and not easy or safe to use.
Innovation Solution
A staggered pair of extendable/retractable steps with a linkage assembly that protrudes differently when extended, allowing safe access without impacting the payload area, and an automatic pneumatic control system for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional step assemblies are used to provide access to the flatbed trailer, then access safety is improved, but the payload carrying area is reduced due to bulky mechanisms
Solution Approach 1:
The step assembly is nested within the rear assembly structure, with steps stored inside the rear assembly when retracted and deployed outward when extended. This nesting approach allows the step mechanism to occupy minimal space during storage while providing full functionality during use, thereby preserving payload carrying area.
Solution Approach 2:
The step assembly transitions from a static bulky structure to a dynamic extendable/retractable mechanism. The steps can extend outward to provide safe access and retract inward to minimize space occupation, allowing the system to adapt its spatial footprint based on operational requirements.
2Adaptability or versatility
If complex mechanisms are used to achieve extendable steps, then access functionality is improved, but device complexity increases
Solution Approach 1:
The linkage assembly merges multiple mechanical functions into a single integrated mechanism. The linkage connects the steps to the rear assembly and simultaneously provides extension, retraction, and positioning functions, reducing the number of separate components and simplifying the overall mechanism.
Solution Approach 2:
The rear assembly serves multiple functions: it structures the rear of the trailer, houses the step mechanism, provides the mounting point for steps, and acts as the retraction destination. This multi-functionality reduces the need for additional dedicated components, simplifying the overall system.
3Ease of operation
If manual operation of steps is used, then ease of operation is reduced, but automation complexity increases
Solution Approach 1:
The step assembly incorporates an automatic control system that enables self-service operation. The system automatically extends steps when the trailer is parked and automatically retracts them when the trailer is in motion, eliminating the need for manual operation while keeping the control mechanism simple through automatic sensing and actuation.
Data Source
AI summary
An extendable/retractable step assembly mounted at the rear assembly of a flatbed trailer to permit access to and from the ground to the flatbed trailer. The extendable/retractable stair assembly includes a pair of steps that are staggered and can be extended out of the rear assembly during use and then retracted therein when not in use. The steps can be manually extended/retracted or they can be automatically controlled. A safety interlock is also disclosed to automatically retract the steps when the trailer emergency brakes are released.