Stackable Coverings with Overpowered Lift Systems
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Solution Overview
Problem
Conventional stackable coverings, such as Venetian blinds, face challenges in limiting user access and manipulation of lift cords due to regulatory requirements, as existing systems do not effectively restrict the ability to access or handle lift cords.
Innovation Solution
An overpowered lift system with a variable torque spring motor assembly and secondary spring motors, combined with hold-down brackets, is used to maintain the bottom rail in position, creating excessive tension in lift cords that limits user manipulation, while allowing the covering to be maintained in non-retracted positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lift cords are used in stackable coverings, then the covering can be easily operated and positioned, but the lift cords remain accessible and manipulatable by users, creating safety concerns and regulatory compliance issues
Solution Approach 1:
The patent introduces an intermediary mechanism (the overpowered lift system with motorized actuator and transmission components) between the user and the lift cords. This intermediary system allows automated or controlled operation of the covering while maintaining tension on the lift cords to prevent direct user manipulation, thereby resolving the contradiction between safety compliance and operational capability
Solution Approach 2:
The patent replaces the conventional manual mechanical lift cord system with an overpowered motorized lift system. The motorized actuator and transmission mechanism substitute for direct manual manipulation of lift cords, providing controlled operation while maintaining cord tension to prevent user access, thus addressing both safety requirements and operational needs
2Reliability
If an overpowered lift system is implemented to restrict lift cord manipulation, then user access to lift cords is limited, but the system becomes more complex and requires additional components
Solution Approach 1:
The patent designs the overpowered lift system to perform multiple functions simultaneously: the motorized actuator provides both the lifting force to operate the covering and maintains continuous tension on the lift cords to prevent manipulation. The transmission mechanism serves both to move the bottom rail and to control cord tension. This multi-functionality reduces the need for separate components, thereby managing system complexity while achieving lift cord security
3Reliability
If the lift system maintains excessive tension to prevent manipulation, then the covering can be held in position against unauthorized movement, but the force required to operate the covering increases
Solution Approach 1:
The patent employs a dynamic tension control mechanism where the motorized actuator adjusts the tension force on the lift cords based on the covering's position and operational state. The system maintains high tension to prevent manipulation when the covering is stationary, but dynamically reduces the force required for operation during controlled movement, thereby resolving the contradiction between position stability and operating force
Solution Approach 2:
The patent utilizes variable tension parameters in the lift system. The motorized actuator can modify the tension level on the lift cords depending on operational requirements - maintaining high tension for security when stationary, and adjusting tension during operation to reduce the force needed by users, thus balancing position stability with ease of operation
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
The solution effectively restricts user access to lift cords, ensuring compliance with regulations by maintaining the covering in desired positions through controlled lifting and tension mechanisms, enhancing safety and functionality.
Implementation Method 1
an overpowered lift system configured to provide a lifting force that raises the bottom rail relative to the headrail towards the retracted position of the covering
Implementation Method 2
creating excessive tension in lift cords that limits user manipulation
Data Source
AI summary
In one aspect, a covering for an architectural structure includes a headrail, a bottom rail supported relative to the headrail, and at least one stackable covering element positioned between the headrail and the bottom rail. The covering also includes an overpowered lift system configured to provide a lifting force that raises the bottom rail relative to the headrail towards a retracted position of the covering. In addition, the covering includes retention structure provided in operative association with the bottom rail, with the retention structure being configured to engage at least one hold-down bracket to hold the bottom rail in position relative to the headrail against the lifting force provided by the overpowered lift system.