Telescoping Cargo Bed Stair Assembly With Pivoting Steps
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Solution Overview
Problem
Existing vehicles with cargo beds lack efficient access systems and load retention mechanisms that facilitate easy entry and exit from the cargo bed, particularly in pickup trucks, and do not provide adequate support for cargo during transportation.
Innovation Solution
A stair assembly for vehicles that includes a first and second support arm assembly with telescoping portions and pivotable steps, which can transition between stowed and extended positions, and a locking mechanism to secure the steps in place, along with load stops that can be deployed or stowed as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stair assembly is added to provide access to the cargo bed, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The support arm assembly serves multiple functions: it provides structural support for the steps, enables telescopic extension for access, and incorporates a locking mechanism for cargo bed positioning. This multi-functionality reduces the need for separate components, thereby improving ease of operation while limiting the increase in device complexity.
Solution Approach 2:
The stair assembly is nested within the tailgate structure when retracted, with steps and support arms stored inside the cargo bed access opening. This nesting approach allows the access system to be integrated into the existing vehicle structure, improving ease of operation without significantly increasing overall device complexity.
2Ease of operation
If telescoping support arms are used to extend the stair assembly, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The support arm assembly incorporates a telescoping mechanism with inner and outer bars that can dynamically extend and retract. This dynamic structure allows the stair assembly to adapt its length for easy access to the cargo bed, improving ease of operation while using a relatively simple telescoping design that limits complexity increase.
Solution Approach 2:
The telescoping support arm assembly includes a locking mechanism that automatically engages to retain the assembly in extended or retracted positions. This self-locking feature eliminates the need for manual locking operations, improving ease of operation while using a straightforward mechanical locking design that does not significantly increase device complexity.
3Ease of operation
If steps are made pivotable to maintain horizontal surfaces, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The steps are pivotally coupled to the support arm assembly, allowing them to dynamically adjust their orientation. This pivoting capability ensures that step surfaces remain substantially horizontal during extension and retraction, improving ease of operation while using a simple pivot connection that minimizes the increase in device complexity.
4Reliability
If a locking assembly is added to secure the stair assembly, then reliability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is designed as a self-contained feature integrated into the telescoping support arm assembly. It automatically engages to retain the stair assembly in extended or retracted positions without requiring additional control systems or complex operating procedures, thereby improving reliability while limiting the increase in device complexity.
Data Source
AI summary
A stair assembly for a vehicle includes a first support arm assembly and a second support arm assembly spaced apart from one another, a first step extending between the first support arm assembly and the second support arm assembly, and a second step extending between the first support arm assembly and the second support arm assembly. The first support arm assembly includes a fixed rail and a telescoping portion movable relative to the fixed rail. The first step and the second step are coupled to the telescoping portion such that extension of the telescoping portion moves the first step and the second step from a retracted position toward an extended position. The first step and the second step are pivotable relative to the first support arm assembly and the second support arm assembly to a staircase position in which step surfaces of the first step and the second step face upward.