Dual-Lock Drawer Access Control for Secure Vending Cabinets
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Solution Overview
Problem
Industrial vending machines require numerous solenoid mechanisms for controlled access to compartments, which are expensive, bulky, and prone to unauthorized access due to rapid drawer withdrawal, compromising security and reliability.
Innovation Solution
A controlled access dispensing system with a dual locking mechanism arrangement, where a first locking mechanism limits drawer withdrawal extent and a second mechanism releases the drawer only when correctly positioned, reducing the number of locking components and enhancing security by pre-selecting the withdrawal distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solenoid-operated latching mechanisms are used for each compartment, then controlled access to individual compartments is achieved, but the number of components increases significantly and the system becomes bulky and expensive
Solution Approach 1:
The patent merges multiple locking functions into a single locking bar that serves all drawers simultaneously. Instead of having separate solenoid mechanisms for each drawer, one locking bar with multiple locking points controls all drawers, dramatically reducing component count while maintaining controlled access capability
Solution Approach 2:
The locking bar is designed as a universal mechanism that performs multiple functions: it locks multiple drawers simultaneously, can be positioned at different heights to control different drawers, and integrates both locking and positioning functions in a single component rather than requiring separate mechanisms for each drawer
2Ease of operation
If solenoid mechanisms with sensors are used for each drawer, then individual drawer control is achieved, but the system becomes expensive and bulky
Solution Approach 1:
Multiple drawer control functions are merged into a single locking bar mechanism. The locking bar can be positioned at different heights and engages with corresponding locking points on different drawers, allowing individual drawer control without requiring separate solenoid and sensor systems for each drawer
Solution Approach 2:
The locking bar acts as an intermediary mechanism between the control system and multiple drawers. Instead of directly actuating each drawer with separate solenoids, the locking bar mediates the locking action by being positioned at specific heights to engage with or release specific drawers, simplifying the control architecture
3Ease of operation
If rapid drawer withdrawal is allowed, then ease of access is improved, but security is compromised due to inability to prevent unauthorized access
Solution Approach 1:
The locking bar is positioned in advance at a predetermined height that corresponds to the desired drawer configuration before the drawer withdrawal action occurs. This preliminary positioning ensures that when the drawer is pulled, the locking bar is already in place to prevent over-withdrawal, maintaining security while allowing authorized access
Solution Approach 2:
The system incorporates sensors that detect the position of the locking bar and the state of drawers, providing feedback to the control system. This feedback mechanism ensures that the locking bar is correctly positioned and that drawers are properly locked or released, preventing unauthorized access while maintaining ease of operation for authorized users
Data Source
AI summary
A drawer control means for controlling access to restricted stored items located in compartments in drawers positioned within a cabinet housing a multiplicity of drawers, said drawers being arranged in columns, whereby the drawers in any column can be controlled such that access to a selected drawer and access to a specified compartment within that drawer is effected by only two locking mechanisms per drawer column, and such that the withdrawal distance of a drawer from the cabinet is pre-set prior to the drawer being opened.