Automatic Attic Ladder with Gravity-Assisted Motor Control
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Solution Overview
Problem
Existing attic access systems are difficult and potentially dangerous for females and elderly individuals due to manual operation requirements, and previous automated solutions are complex and costly.
Innovation Solution
A fully automatic attic access system using a single electric motor to control the deployment, retraction, and closing of a retractable ladder, with gravity-assisted opening and motor-controlled speed, featuring a stow latch mechanism and gears for controlled movement, and optional manual override.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual operation is used for opening panel and deploying ladder, then device complexity is reduced, but ease of operation deteriorates for females and elderly individuals
Solution Approach 1:
The system uses gravity as a self-service mechanism to automatically deploy the ladder sections and close the panel without requiring manual effort from the user. The motor only needs to control the rate of deployment and initiate/terminate the process, not perform the heavy work of moving the ladder and panel.
Solution Approach 2:
The patent replaces the purely manual mechanical operation with an automated motorized system that uses electrical control to manage the mechanical components. The motor substitutes for human strength while gravity substitutes for the complex mechanical linkage needed for full automation.
2Ease of operation
If full automation with motor is implemented, then ease of operation is improved, but device complexity and cost increase
Solution Approach 1:
The system uses gravity as a counterweight force to balance the weight of the ladder and panel. During deployment, gravity assists the motor by providing the force needed to move the components downward, reducing the motor's power requirements and simplifying the overall system.
Solution Approach 2:
The motor operates in periodic cycles: initiating deployment, controlling the rate during deployment, stopping at the fully extended position, and then controlling retraction. This periodic operation simplifies the control system compared to continuous active control throughout the entire range of motion.
3Device complexity
If gravity-assisted deployment is used, then device complexity is reduced, but control precision deteriorates due to uncontrolled falling speed
Solution Approach 1:
The motor control system provides feedback regulation of the deployment rate. By monitoring the motor's operation and adjusting power delivery, the system maintains controlled descent speed despite gravity's influence, ensuring precise positioning at the fully extended position.
Solution Approach 2:
The system changes the motor's operational parameters during deployment: starting at a controlled rate, adjusting to maintain optimal descent speed, and modulating to stop precisely at the fully extended position. This dynamic parameter adjustment enables precise control while using gravity assistance.
4Productivity
If manual ladder refolding and panel closing is required, then device complexity is reduced, but productivity deteriorates due to multiple manual steps
Solution Approach 1:
The system merges the ladder retraction and panel closing operations into a single automated motor-driven process. Both actions occur simultaneously during the retraction phase, eliminating the need for separate manual operations and improving productivity without significantly increasing complexity.
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
Provides safe and easy access to attics for everyone at a lower cost by automating the process of opening, extending, retracting, and closing the ladder, ensuring controlled deployment and retraction, enhancing user safety and accessibility.
Implementation Method 1
The automatic opening of the access panel and the automatic deploying of the retractable ladder are achieved through gravity
Implementation Method 2
the rate of deployment is controlled with the assistance of a motorized apparatus
Implementation Method 3
the access panel, spring loaded in the closed position
Data Source
AI summary
An access panel is shown in the present invention to provide easy and safe access to an attic space or elevated structure. The access panel is fully automatic. During opening, the access panel uses an energizing motor to control the gravitational forces for opening a cover and deploying ladder sections. During closing, the access panel is energized to retract the ladder sections and close the access panel. The motor is energized to close the access panel until a stow latch engages to stow the access panel during non-use. A safety switch is mounted inside the attic space to allow a user to open the panel and extend the ladder should the user be trapped in the attic space.