Extensible Mast for Autonomous Mobile Device
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Solution Overview
Problem
Traditional caster assemblies in autonomous mobile devices are tall, increasing the overall height and volume, reducing stability and efficiency, and are prone to fouling, which can lead to dragging and damage.
Innovation Solution
A low-profile caster assembly with a target element detected by an inductive sensor to prevent fouling and a modular, extensible mast system for positioning payloads at various heights, allowing for compact design and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional caster assemblies are used, then the device can move, but the height and volume increase, reducing stability
Solution Approach 1:
The mast is divided into multiple telescoping sections that can be independently positioned. Each section contains internal ribs that guide alignment and allow the mast to be segmented into manageable parts that nest within each other, reducing overall height when retracted while maintaining full height when extended for payload support
Solution Approach 2:
The telescoping mast sections are nested within each other in a concentric arrangement. Each section contains the next smaller section, allowing the mast to collapse into a compact form when not in use, significantly reducing the height and volume occupied by the support structure
2Productivity
If traditional caster assemblies are used, then the device can move, but the volume increases, reducing efficiency
Solution Approach 1:
The telescoping mast sections are nested within each other in a concentric arrangement. Each section contains the next smaller section, allowing the mast to collapse into a compact form when not in use, significantly reducing the height and volume occupied by the support structure
Solution Approach 2:
The mast transitions from a static fixed-height structure to a dynamic telescoping structure that can change its height and volume based on operational requirements. The mast can be extended to full height for payload support and retracted to minimal height for compact storage, optimizing space utilization
3Reliability
If traditional caster assemblies are used, then the device can move, but fouling occurs, leading to dragging and damage
Solution Approach 1:
The inductive sensor replaces mechanical contact-based detection systems. It uses electromagnetic fields to detect the presence and position of the target element on the mast without physical contact, eliminating wear and fouling associated with mechanical switches or contact sensors
Solution Approach 2:
A non-contact electromagnetic field acts as an intermediary between the sensor and the mast target element. This intermediary allows information transfer about mast position and presence without direct physical contact, preventing fouling of the detection system
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 enhances the stability and efficiency of autonomous mobile devices by minimizing height and volume, preventing fouling, and allowing for flexible payload positioning, while reducing manufacturing costs and improving maintenance.
Implementation Method 1
A low-profile caster assembly with a target element detected by an inductive sensor to prevent fouling
Data Source
AI summary
An autonomous mobile device has a main body and an extensible mast to raise and lower a payload, such as a camera, relative to the main body. The mast may comprise a set of telescoping sections, with each section comprising two or more pieces that are joined during assembly. A motor moves a flexible rack between a first spool and the mast to raise or lower the mast. For example, during extension a motor-driven pinion engages teeth on the flexible rack, pulling the rack from the first spool and pushing up the mast. A cable stored on a second spool may be extended and retracted with the flexible rack. The cable transfers one or more of data or power between the main body and the payload. A sensor may be used to detect features on the flexible rack to provide data about how far the flexible rack has been extended.