Multi-compartment Step-drawer Mechanical Latching for ADM Cable Reliability
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Solution Overview
Problem
Current sliding drawers used in Automated Dispensing Machines (ADMs) for controlled medications suffer from frequent breakage of flexible electrical cables due to constant flexing, leading to unreliable operation and increased maintenance needs.
Innovation Solution
The design eliminates electrical components in the sliding drawer assembly, using a mechanical ladder with cross-arms and a latching element controlled by a processor to manage compartment access, eliminating the need for flexible cables and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible electrical cable is used to connect the drawer-mounted solenoid to the processor, then electrical connection is achieved, but the cable breaks due to constant flexing
Solution Approach 1:
The patent removes the flexible electrical cable from the system by relocating the solenoid to the fixed chassis and providing electrical connection through rigid conductors in the chassis, eliminating the moving electrical connection that caused failure
Solution Approach 2:
The patent introduces a rigid electrical connector in the fixed chassis that serves as an intermediary to provide electrical connection without requiring flexible cables, transferring the electrical connection function from the moving drawer to the stationary chassis
2Ease of operation
If the solenoid is mounted in the sliding drawer, then control of drawer opening distance is achieved, but electrical cable failure occurs due to flexing
Solution Approach 1:
The patent inverts the conventional arrangement by placing the solenoid in the fixed chassis rather than the sliding drawer, reversing which component is stationary and which is moving to eliminate cable flexing
Solution Approach 2:
The patent extracts the solenoid from the moving drawer assembly and relocates it to the fixed chassis, removing the source of the reliability problem while preserving the control function
3Device complexity
If multiple conductors are laminated between polyimide layers to form a ribbon cable, then electrical connection is provided, but delamination occurs under stress
Solution Approach 1:
The patent removes the entire ribbon cable assembly from the system by providing electrical connection through rigid conductors in the fixed chassis, eliminating the lamination structure that was prone to delamination
Solution Approach 2:
The patent replaces the flexible mechanical ribbon cable system with a rigid electrical connector system in the fixed chassis, substituting a flexible mechanical solution with a rigid alternative that does not undergo cyclic stress
Data Source
AI summary
A multi-pocket step-drawer is disclosed that includes a dispensing drawer and a control module. The dispensing drawer has a body comprising at least one fixed wall forming at least two open-top compartments that are arranged along an axis parallel to the front-to-back axis and a ladder fixedly coupled to the body. The ladder has a plurality of cross arms arranged along an axis parallel to the front-to-back axis. The control module includes a housing and a latching element coupled to the housing and disposed proximate to the ladder. The latching element has a first position wherein the latching element engages one of the plurality of cross-arms so as to prevent the dispensing drawer from moving toward the front and a second position wherein the latching element allows the dispensing element to move toward the front.