Top-Down Bottom-Up Roller Shade With Independent Rail Control
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Solution Overview
Problem
Existing systems for top down/bottom up shades lack a simplified roll-up mechanism that allows independent movement and positioning of top and bottom rails, complicating the operation and installation of these types of window coverings.
Innovation Solution
A roll-up shade system featuring a roller with separate pairs of lift cords for independent movement of top and bottom rails, utilizing a clutch mechanism and spools to wrap and unwrap the cords, allowing for single control operation of both rails and incorporating a stop system for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent cord-operated systems are used for raising and lowering top and bottom rails, then the rails can be independently positioned at any desired location, but the device complexity increases
Solution Approach 1:
The patent combines two independent cord-operated systems into a single integrated roller mechanism. The roller simultaneously winds and unwinds lift cords for both the top rail and bottom rail through a shared spool system, reducing the number of separate mechanisms while preserving independent positioning capability through a control mechanism that manages both cords.
Solution Approach 2:
The roller mechanism serves multiple functions: it winds and unwinds lift cords for both the top rail and bottom rail, provides independent positioning control for both rails, and incorporates a control mechanism that manages the operation of both cords through a single operational interface, making the system more versatile and less complex.
2Ease of operation
If a simplified roll-up system is used for top down/bottom up shade, then the operation and installation become easier, but the capability to independently position top and bottom rails may be compromised
Solution Approach 1:
The patent merges the functions of two separate cord-operated systems into a single roller mechanism that handles both top and bottom rail positioning. This simplifies operation and installation while maintaining independent positioning capability through a control mechanism that manages both lift cords through a unified system.
Solution Approach 2:
The control mechanism acts as an intermediary between the user and the dual cord system. It provides a simplified interface for operating both the top and bottom rails independently, translating user input into coordinated movement of both rails without requiring separate control systems.
Data Source
AI summary
A top down/bottom up covering for an architectural opening is disclosed in a roll-up configuration so the shade can be rolled about a roller in a head rail while having the ability to raise and lower top and bottom rails between which the shade material extends independently of each other. The roller is utilized to raise and lower the bottom rail by wrapping about or unwrapping the shade material from the roller and a control system for raising and lowering the top rail is confined within the roller. The invention is disclosed in embodiments that include a single operating element or a pair of operating elements but in each instance the top and bottom rails are independently movable so the shade material can be extended to any degree between the top and bottom rails and positioned at desired locations within the architectural opening in which the covering is mounted.