Autonomous Mobile Device Extensible Mast and Low-Profile Caster
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Solution Overview
Problem
Traditional caster assemblies in autonomous mobile devices are tall and voluminous, increasing the height of the device and reducing stability, and are prone to fouling, which can lead to reduced mobility and potential damage.
Innovation Solution
A low-profile caster assembly with a metallic target element that prevents debris from reaching the axle, using an inductive sensor to detect fouling, and an extensible mast system with telescoping sections that can position payloads at various heights, minimizing volume and weight while maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional caster assemblies are used, then the device has sufficient mobility, but the height and volume increase, reducing stability
Solution Approach 1:
The caster assembly is divided into multiple independent components: a low-profile caster body, a separate wheel assembly, and a protective shield. This segmentation allows each component to be optimized independently, reducing overall height while maintaining mobility function.
Solution Approach 2:
The protective shield extends horizontally rather than vertically to prevent fouling, solving the debris protection problem without increasing device height. This dimensional shift addresses the fouling issue while maintaining the low-profile requirement.
2Reliability
If traditional caster assemblies are used, then the device has sufficient mobility, but the volume increases
Solution Approach 1:
The wheel assembly is nested within the caster body housing, and the protective shield is integrated into the existing structure. This nesting arrangement eliminates wasted space and reduces overall caster assembly volume while preserving all necessary functions.
3Adaptability or versatility
If the mast is extended to position payloads at various heights, then flexible payload positioning is achieved, but the device height increases
Solution Approach 1:
The mast is designed as an extensible structure that can dynamically adjust its length based on payload positioning requirements. When retracted, it maintains a low profile; when extended, it provides the necessary reach for versatile payload placement.
Solution Approach 2:
A cable-driven lifting mechanism replaces traditional mechanical extension systems, allowing the mast to extend and retract smoothly without adding significant volume or complexity to the base structure.
4Reliability
If protective measures are added to prevent fouling, then reliability improves, but device complexity increases
Solution Approach 1:
The protective shield is passively positioned to deflect debris away from the wheel assembly without requiring active control systems. The design uses the natural flow of debris and simple geometric shaping to achieve protection, avoiding complex sensors or actuators.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces the overall height and volume of the device, enhances stability, prevents fouling, and allows for flexible payload positioning, improving mobility and reliability while maintaining a compact design.
Implementation Method 1
using an inductive sensor to detect fouling
Data Source
AI summary
An autonomous mobile device (AMD) includes a telescoping mast with sensors on top that are connected to a cable running through the mast. An inner section of the mast includes a bobbin that secures cables. The bobbin has a shaft and features that guide cables to helically wind around the shaft. The bobbin reduces stress on the cable as the mast moves. The mast is lifted by a rack that includes a portion with teeth and a portion without. The portion with teeth is driven by a motor. The portion without teeth connects the rack to a spool. The toothless section reduces stress on the toothed portion of the rack as it spools or unspools. The AMD includes a hinge to tilt a display. To securely position the hinge on a shaft, the shaft is spun after assembly so that a push nut cuts a retention groove in the shaft.