Tailgate Stair Assembly With Load Stop for Pickup Cargo Beds
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Solution Overview
Problem
Existing vehicles with cargo beds lack efficient and versatile systems for accessing the cargo bed, particularly in pickup trucks, and there is a need for improved load retention mechanisms during transportation.
Innovation Solution
A stair assembly for vehicles that transitions between a stowed and staircase position, utilizing a four-bar linkage mechanism with pivotable steps and telescoping arms, and optional lift assist for easy access, along with various load stop configurations such as flip-up, pivotable, and roller load stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stair assembly is added to access the cargo bed, then user accessibility is improved, but device complexity increases
Solution Approach 1:
The stair assembly is integrated with the tailgate structure, combining two functions (tailgate and stairs) into a single unified system. The stairs are mounted to the tailgate and move with it, eliminating the need for separate mounting structures and reducing overall system complexity.
Solution Approach 2:
The tailgate structure serves dual purposes: it acts as both the cargo bed closure and the mounting structure for the stair assembly. This multi-functionality reduces the number of separate components needed and simplifies the overall system architecture.
2Ease of operation
If a four-bar linkage mechanism is used for the stair assembly, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The four-bar linkage mechanism is designed to move the stair assembly automatically as the tailgate opens or closes. The mechanical linkage converts the tailgate's motion into corresponding stair movement without requiring separate actuators, motors, or control systems, making the system self-servicing and reducing complexity.
Solution Approach 2:
The patent replaces electronic or hydraulic actuation systems with a pure mechanical four-bar linkage system. This substitution eliminates the need for complex control electronics, sensors, and power systems, reducing overall device complexity while maintaining ease of operation.
3Ease of operation
If steps are configured to pivot together, then ease of operation is improved, but device complexity increases
Solution Approach 1:
Multiple steps are connected through pivot connections that allow them to move together as a unified structure. This merging of individual steps into a coordinated assembly reduces the number of independent components and simplifies the control mechanism needed to position them.
4Reliability
If load stop mechanisms are added, then load retention is improved, but device complexity increases
Solution Approach 1:
The stair assembly structure is designed to serve dual purposes: providing user access to the cargo bed and simultaneously functioning as a load stop mechanism. The steps and support structures can prevent cargo from sliding forward, eliminating the need for separate load retention devices.
Solution Approach 2:
The load stop function is integrated into the existing stair assembly structure rather than being added as a separate component. The steps and their support mechanisms serve both as access points and as barriers to retain cargo, reducing overall system complexity.
Data Source
AI summary
A cargo bed system includes a stair assembly that is movable between a stowed position and a staircase position relative to a vehicle structure. The stair assembly includes first and second support arm assemblies and first and a second steps. The first and second steps are configured to pivot together.