Adjustable Lift Cord Anchor for Precise Movable Rail Alignment
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Solution Overview
Problem
Existing retractable coverings for architectural openings face difficulties in precisely adjusting the effective length of lift cords, which affects the spacing and orientation of movable rails, making it challenging to achieve a fully extended and horizontally parallel position with the headrail.
Innovation Solution
An adjustable lift cord anchor system featuring a two-piece design with a rotatable drum and housing, allowing for adjustable length of lift cords by wrapping or unwrapping the cord around the drum, and retaining mechanisms to secure the drum position, enabling precise adjustment of cord length and rail positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a knot is established in the lift cord to connect to the movable rail, then the lift cord can be retained in the rail, but it is very difficult to position the knot at a precisely desired location, resulting in imprecise rail spacing and orientation
Solution Approach 1:
The patent introduces a drum as an intermediary component between the lift cord and the movable rail. The drum replaces the direct knot-tying method with a winding mechanism that allows precise positioning of the lift cord attachment point. The drum can be rotated to wind or unwind the lift cord, enabling accurate adjustment of the effective cord length and corresponding rail position, thereby solving the precision problem inherent in direct knotting methods.
2Manufacturing precision
If the effective length of lift cords is adjusted to achieve precise rail positioning, then the rail can be positioned horizontally parallel to the headrail, but the adjustment mechanism increases device complexity
Solution Approach 1:
The patent divides the anchor mechanism into two separate pieces: a housing and a drum. The housing contains the drum and provides structural support, while the drum performs the rotation and winding function. This segmentation allows each component to be optimized independently and simplifies the overall assembly and adjustment process, reducing the complexity burden despite the added functionality for precise positioning.
3Adaptability or versatility
If the drum is made rotatable to adjust lift cord length, then precise cord length adjustment is enabled, but additional retaining mechanisms are required to maintain selected positions
Solution Approach 1:
The patent incorporates a retaining mechanism that provides positional feedback and stabilization for the drum. The retaining mechanism engages with the drum at selected positions to prevent unintended rotation, ensuring that once the drum is positioned at a desired cord length, it remains stable. This feedback mechanism allows the system to maintain its adjusted state without continuous external intervention, balancing adaptability with stability.
Data Source
AI summary
An adjustable anchor for anchoring a lift cord in a movable rail of a covering for an architectural opening includes a housing which is releasably positionable interiorly of the movable rail in alignment with a lift cord for the covering with the anchor including a rotatable drum within the housing and around which the lift cord can be wrapped or unwrapped by rotating movement of the drum with a tool. Two distinct systems are provided for releasably securing the drum in any selected position to retain the amount of lift cord wrapped therearound with the two system acting in mutually perpendicular planes for reliable anchoring of the lift cord.