Step Frame Stair Traversal for Level Payload Transport
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Solution Overview
Problem
Existing stair traversing devices are complex, costly, and require active electronic control to maintain a level orientation while navigating stairs, posing challenges for both industrial and domestic applications.
Innovation Solution
A mechanical stair traversing device utilizing a uniquely shaped step frame with a cyclical motion mechanism, driven by actuators, that maintains a stable, level orientation without the need for active control, allowing it to traverse stairs by translating along a cyclical path that conforms to the shape of stair steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing stair traversing devices use coordinated walking elements or articulating wheel sets with feedback control, then the device can traverse stairs, but the device complexity increases and cost increases
Solution Approach 1:
The device divides the stair traversing function into two independent segments: a payload body for carrying loads on level surfaces and a step frame assembly for traversing stairs. The step frame assembly can be attached to or separated from the payload body, allowing each component to be optimized independently for its specific function without requiring complex integrated systems.
Solution Approach 2:
The step frame assembly is designed to be self-sufficient for stair traversal, using its own cyclical motion mechanism rather than relying on the payload body's propulsion system. The cyclical motion mechanism automatically propels the step frame up stairs through repeated engagement with stair treads, eliminating the need for complex feedback control systems.
2Adaptability or versatility
If existing stair traversing devices use feedback control to maintain level orientation, then the device can traverse stairs, but the extent of automation increases and cost increases
Solution Approach 1:
The step frame assembly maintains a consistently elevated position throughout the stair traversal process, keeping the payload body on a stable platform. This equipotential approach ensures the payload remains level without requiring active sensing or control systems, as the mechanical design inherently maintains stability.
Solution Approach 2:
The step frame assembly's cyclical motion mechanism automatically maintains stable payload delivery through its mechanical design. The repeated engagement with stair treads and the elevated delivery position are achieved through the inherent mechanics of the system rather than through electronic sensing and active control.
3Adaptability or versatility
If material handling devices tilt the payload to balance the center of mass, then the device can traverse stairs, but the ease of operation decreases and safety hazards increase
Solution Approach 1:
The step frame assembly maintains the payload body in a stable, level position throughout the stair traversal process. The payload is delivered at a consistent elevated height without tilting, ensuring the center of mass remains stable and eliminating the need for operator intervention to balance the load.
Solution Approach 2:
The step frame assembly acts as an intermediary mechanism between the payload body and the stairs. It absorbs the complexity of stair navigation, allowing the payload to be transported smoothly without tilting or requiring operator stabilization, thereby improving safety and ease of operation.
4Adaptability or versatility
If mobility devices use tank-like treads or anthropomorphic legs to traverse stairs, then the device can traverse stairs, but the device complexity increases and cost increases
Solution Approach 1:
The device separates stair traversal functionality from the main payload platform by using a dedicated step frame assembly. This segmentation allows the use of a simple, efficient cyclical motion mechanism for stair traversal rather than complex tank treads or anthropomorphic legs, reducing overall device complexity while maintaining capability.
Data Source
AI summary
A stair traversing device comprising a payload body for transporting a payload, a step frame, and a mechanism between the step frame and the payload body to move the step frame relative to the payload body along a cyclical path. The mechanism drives a movement of one of the payload body and the step frame along a first segment of the cyclical path from a retracted configuration to an extended configuration, and drives a movement of the other one of the payload body and the step frame along a second segment of the cyclical path back into the retracted configuration. The payload body and the step frame are configured to remain fixedly in position on a stair when the other one of the payload body and the step frame is moved. The mechanism is configured to maintain the relative orientation between the payload body and the stair.