Elevating Cage Dual-Input Worm Drive Manual Override
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Solution Overview
Problem
Elevating cages for shipping containers are often immovable during power failures or motor failures, as they rely solely on powered motors for operation, leaving them stuck in elevated positions until power is restored.
Innovation Solution
A shared gear assembly is used to enable both motor-driven and manual actuation mechanisms, allowing the carriage to be raised and lowered, incorporating a worm drive for safety and a counterweight to offset the carriage's weight, ensuring mobility even without power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a powered motor is used to raise and lower the carriage, then the operation is automated and efficient, but the system becomes vulnerable to power failures and motor failures leaving the carriage immovable
Solution Approach 1:
The system enables self-service operation through a manual cranking mechanism that allows operators to manually raise and lower the carriage when power is unavailable. The manual override mechanism permits the system to serve itself by providing backup operation capability without requiring external power or motor assistance during critical situations.
Solution Approach 2:
The system transitions from a static powered-only configuration to a dynamic system that can adapt between powered and manual modes. The dual-input gear assembly allows the system to dynamically switch between motor-driven operation and manual cranking based on power availability, providing operational flexibility and enhanced reliability.
2Adaptability or versatility
If a manual actuation mechanism is added to enable manual operation during power failures, then operational flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent merges the manual cranking mechanism with the existing motor-driven gear assembly into a unified dual-input system. Both the motor and manual crank share the same gear transmission path, allowing them to work together or independently. This merging approach provides operational flexibility while minimizing additional complexity by reusing existing structural components.
Solution Approach 2:
The shared gear assembly serves multiple functions: it transmits power from the motor during normal operation, transmits manual cranking force during power failures, and provides a common transmission path for both operation modes. This multi-functionality reduces the need for separate transmission systems, thereby limiting the increase in device complexity while enhancing versatility.
3Device complexity
If a shared gear assembly is used for both motor and manual actuation, then the structure is optimized and complexity is reduced, but the gear assembly must handle variable input forces and modes
Solution Approach 1:
The shared gear assembly is designed to universally handle both motor-driven and manual cranking inputs through a single transmission path. The gear assembly's multi-functionality allows it to accommodate variable input forces and operation modes without requiring mode-specific transmission components, thereby maintaining structural simplicity while achieving input mode adaptability.
Solution Approach 2:
The gear assembly acts as an intermediary that mediates between the variable inputs (motor or manual crank) and the carriage movement. It translates different input types and force levels into unified mechanical motion, providing adaptability to variable input modes while maintaining a simple, unified structural design that avoids the need for separate transmission paths.
Data Source
AI summary
An elevating cage apparatus includes a support structure and a carriage that is operable to move vertically with respect to the support structure. The carriage is configured to be alternatively raised and lowered via a first driver and a second driver. The first driver may comprise a powered (electric, hydraulic, or pneumatic) motor, and the second driver may comprise a manual actuation mechanism including a hand crank. Both input drivers may be operable to move the carriage through a dual input worm drive gear box.