Modular Propane Cylinder Vending for Off-Grid Self-Service
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Solution Overview
Problem
Existing vending systems for dispensing propane tanks and other hazardous items in Class I Division 2 locations are inefficient, requiring manual assistance and being unable to operate continuously without AC power, leading to inconvenience and reduced sales opportunities.
Innovation Solution
A modular outdoor vending system that uses DC power, rechargeable via AC or solar energy, allowing for self-service and continuous operation, with a scalable design and real-time telemetry for efficient restocking and error management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual assistance is used to access and dispense propane tanks from locked containers, then security and controlled access are improved, but service efficiency and customer convenience deteriorate
Solution Approach 1:
The system enables customers to independently access and dispense propane tanks through automated mechanisms. The vending machine allows customers to initiate the dispensing process themselves without requiring store personnel to physically retrieve tanks from locked containers, thereby maintaining security through controlled access while dramatically improving service efficiency and eliminating waiting time.
Solution Approach 2:
The patent replaces manual mechanical operations (employees physically unlocking and retrieving tanks) with an automated mechanical system. The vending machine incorporates automated door unlocking mechanisms, tank retrieval systems, and controlled dispensing mechanisms that operate without human intervention, substituting the manual labor-based system with an automated mechanical solution.
2Reliability
If AC power is required for vending system operation, then electrical system reliability is improved, but operational flexibility and continuous availability deteriorate
Solution Approach 1:
The system transitions from a static power dependency (requiring continuous AC power) to a dynamic power management approach. The vending machine incorporates battery systems that can operate in AC power mode when available, automatically switching to battery power when AC is unavailable, and accepting solar charging when conditions permit. This dynamic adaptability ensures continuous operation across varying environmental conditions.
Solution Approach 2:
The patent changes the electrical operating parameters of the system by incorporating multiple power sources with different characteristics. The system accepts AC power (high power, grid-dependent), battery power (moderate power, independent), and solar power (variable power, weather-dependent). This parameter diversification allows the system to adapt to different operational conditions and maintain flexibility while ensuring reliable operation.
3Adaptability or versatility
If modular design is implemented for system expansion, then adaptability and scalability are improved, but device complexity and integration requirements worsen
Solution Approach 1:
The vending system is divided into discrete modular units that can be independently configured and assembled. Each module represents a functional segment that can be added, removed, or reconfigured based on operational requirements. This segmentation enables scalable expansion from single-vendor to multi-vendor configurations while maintaining manageable system complexity through standardized interfaces and independent module operation.
Solution Approach 2:
The modular design incorporates universal interfaces and standardized connection protocols that allow different module types to interoperate through common mechanisms. The system uses universal mounting structures, electrical connections, and control interfaces that enable any module to work with any other module, reducing integration complexity while maximizing scalability and adaptability across different deployment scenarios.
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
Enables convenient, secure, and reliable access to propane tanks and other items 24/7, reducing downtime and increasing sales efficiency by allowing self-service and continuous operation without AC power, while adhering to hazardous location standards.
Implementation Method 1
The system can use solar energy to allow the DC batteries to operate for extended periods of time
Implementation Method 2
The systems outlined above help to facilitate the vending of products in Class I, Division 2 hazardous locations. The DC power levels typically contemplated by solar or battery systems are often below hazardous levels
Data Source
AI summary
A modular outdoor large item vending system for large items such as propane tanks, liquid petroleum gas cylinders of various sizes and other items that must be stored in and dispensed from a hazardous location compliant system. The vending system can be placed on a store front, parking lot, campsite, or park, and comprises a master module assembly connected to a plurality of add-on module assemblies with each of the master module assembly and the add-on module assemblies having compartments to hold large items which are dispensed from the compartments when a payment is made through a credit card reader interface located on a master module control compartment door face. The large item vending system of the invention is powered by AC current which is turned to DC power by a power supply, or DC batteries charged by AC power and/or solar power, or by other power means.