Shade Lock Assembly Friction Reduction via Roller Wheel Dynamics
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Solution Overview
Problem
Current retractable shade systems require a continuous loop drive assembly with an anchor, increasing cost and complexity, and compromising aesthetics.
Innovation Solution
A direct drive shade lock assembly that reduces friction and resistance using a single pull cord, allowing for easy operation and aesthetically pleasing design without the need for a continuous loop drive assembly, featuring a spool and roller wheel mechanism for locking and unlocking the pull cord.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous loop drive assembly with anchor is used, then the shade can be operated, but the cost and complexity increase and aesthetics are compromised
Solution Approach 1:
The patent removes the anchor component from the continuous loop drive assembly, extracting the problematic element that caused aesthetic issues and complexity. The pull cord system is reconfigured to function without requiring an anchor mounted in the architectural opening, thereby simplifying the overall system while maintaining operational reliability.
Solution Approach 2:
Instead of using a continuous loop pull cord that requires anchoring at both ends, the invention inverts the approach by using a single pull cord that is secured at one end and creates a loop that can be pulled without requiring an anchor at the bottom. This reverses the traditional anchoring strategy and eliminates the aesthetic and complexity problems.
2Reliability
If a continuous loop drive assembly with anchor is used, then the shade can be operated, but the appearance becomes unpleasant
Solution Approach 1:
The anchor component that protrudes into the architectural opening and creates aesthetic issues is completely removed from the system. The pull cord is reconfigured to achieve its locking function without requiring visible hardware in the opening, resulting in a clean, aesthetically pleasing appearance while maintaining full operational capability.
3Device complexity
If a single pull cord system is used without continuous loop drive assembly, then aesthetics are improved and complexity is reduced, but friction and resistance increase
Solution Approach 1:
The patent incorporates a roller wheel that can dynamically change position within the pull cord channel. The roller wheel moves from a first position that allows free cord movement (reducing friction during extension) to a second position that creates friction engagement (providing locking during retraction). This dynamic positioning system optimizes friction characteristics based on operational requirements.
Solution Approach 2:
The roller wheel is pre-positioned in a first position within the pull cord channel that minimizes friction and resistance before operation begins. This preliminary positioning ensures smooth cord movement during shade extension, and the system is prepared in advance to transition to the locking position when needed.
4Shape
If a single pull cord system is used without continuous loop drive assembly, then aesthetics are improved, but ease of operation may be affected
Solution Approach 1:
The dynamic roller wheel mechanism automatically transitions between positions based on the operational phase. During extension, the roller wheel positions itself to minimize friction, making pulling easy. During retraction, it automatically engages to provide locking force. This dynamic adaptation maintains ease of operation throughout the full range of motion while preserving aesthetic appearance.
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 simplifies shade operation, reduces friction, and enhances child safety while providing a clean, aesthetically pleasing appearance by eliminating the need for a continuous loop drive assembly and anchor, making it easier to extend or retract shades with a single pull cord.
Implementation Method 1
the roller wheel may be moved to a locked position such that the pull cord is pinched between the roller wheel and the stationary wheel
Implementation Method 2
A direct drive shade lock assembly that reduces friction and resistance using a single pull cord, allowing for easy operation and aesthetically pleasing design without the need for a continuous loop drive assembly, featuring a spool and roller wheel mechanism for locking and unlocking the pull cord
Data Source
AI summary
A shade lock assembly for a shade assembly is provided. The shade lock assembly may include a spool rotatably attached to a housing, with the housing defining a pull cord channel. A pull cord may be provided that extends through the pull cord channel and wraps at least partially around the spool. The pull cord channel may include a roller wheel configured to interact with the pull cord and a second wall of the pull cord channel such that it may move between a locked and an unlocked position based at least in part by the angle at which the pull cord is held relative to a plane defined the shade assembly.