Heavy-Duty Truck Bumper Step With Deployable Two-Stage Hinge
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Solution Overview
Problem
Existing bumper steps for heavy-duty trucks are either too narrow for comfortable footing or limit vehicle design due to the placement and height of steps, making maintenance tasks like cleaning windshields or replacing wiper blades difficult.
Innovation Solution
A bumper step design featuring a main bracket with a deployable first step and an upwardly deployable second step, where the second step is folded behind the first, increasing the width and height of the step area without restricting vehicle design, using a gas lifter and simple two-shaft hinge structure for easy operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single step is provided on the bumper, then the structure is simple, but the step width is narrow making it difficult to perform maintenance
Solution Approach 1:
The single step is divided into two separate steps: a lower step and an upper step. The lower step provides a wide standing area for stability, while the upper step enables access to higher maintenance areas. This segmentation resolves the contradiction by allowing each step to serve its specific function rather than requiring one step to accommodate all requirements.
Solution Approach 2:
The solution transitions from a single-step design to a two-level vertical arrangement. By adding the vertical dimension with an upper step positioned above the lower step, the system provides both wide footing area (horizontal dimension) and elevated access (vertical dimension), thereby resolving the contradiction between step width and maintenance accessibility.
2Ease of operation
If two steps are provided at upper and lower ends of the bumper, then the height is increased for upper windshield maintenance, but the step width is decreased and vehicle design is limited
Solution Approach 1:
Each step is designed with optimized local characteristics: the lower step has a wider width optimized for stable standing and weight bearing, while the upper step is positioned to provide access to upper maintenance areas. This local optimization allows each step to excel at its specific function without compromising the other.
Solution Approach 2:
The steps are designed to be rotatable and deployable rather than fixed. The lower step can rotate downward for deployment, and the upper step can rotate upward. This dynamic design allows the steps to be compact when not in use, minimizing impact on vehicle design, while providing full functionality when deployed.
3Adaptability or versatility
If steps are made rotatable and deployable, then vehicle design flexibility is maintained, but the structure becomes more complex
Solution Approach 1:
The hinge mechanisms for both steps are integrated into the bumper structure itself. The lower step's hinge is connected to the bumper, and the upper step's hinge is connected to the lower step assembly. This merging of the hinge functions into a unified structure reduces overall complexity compared to having separate, independent mechanisms for each step.
Solution Approach 2:
The steps utilize their own weight and gravitational force to assist in the deployment and positioning operations. When deployed, the steps naturally settle into stable positions due to gravity, reducing the need for additional locking mechanisms or complex actuation systems.
Data Source
AI summary
A bumper step for a heavy-duty truck includes a main bracket that is provided on a front lower portion of a vehicle. The lower end of a first step is hinged to the main bracket such that the first step is rotatable and deployable downwards, and the first step is fixed in a deployed position. A second step is provided behind the first step. The upper end of the second step is hinged to the main bracket such that the second step is rotatable and deployable upwards. The second step is fixed in position above the first step.