Bottom Rail Level Adjustor for Window Coverings
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Solution Overview
Problem
Existing window coverings with bottom rails face challenges in maintaining level balance during installation and over time due to stretching or contraction of lift cords and weights, requiring complex adjustments and specialized tools, and lack of easy retro-fitting solutions for existing blinds.
Innovation Solution
A bottom rail leveling device with a housing and spindle mechanism that allows for easy adjustment of lift cord length by winding or unwinding it, using a screwdriver-operated spindle with notches and a cord anchor clip, enabling snap-fit installation and retro-fitting on various types of bottom rails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If weights are moved or lift cord length is adjusted to level the bottom rail, then the bottom rail balance is improved, but the device complexity and difficulty of operation increase
Solution Approach 1:
The bottom rail leveling device enables users to independently adjust the lift cord length through a user-friendly mechanism with visual indicators and simple rotational movement, eliminating the need for specialized tools or complex procedures while maintaining stable bottom rail balance
Solution Approach 2:
The device allows continuous adjustment of the lift cord length parameter through rotational movement of the adjustment mechanism, enabling precise control over the bottom rail balance by changing the effective length of the lift cord without requiring discrete weight repositioning
2Stability of the object's composition
If the bottom rail is adjusted during installation, then the initial level balance is improved, but the ability to make future adjustments deteriorates
Solution Approach 1:
The leveling device transitions from a static configuration to a dynamic adjustment system that remains functional throughout the product lifecycle, allowing both initial installation adjustments and future maintenance adjustments through the same accessible mechanism
3Manufacturing precision
If specialized tools are used for leveling, then the manufacturing precision is improved, but the ease of operation deteriorates
Solution Approach 1:
The device incorporates visual indicators and intuitive controls that enable users to achieve precise leveling without specialized tools, allowing the system to self-guide the adjustment process through clear visual feedback and simple operational steps
4Stability of the object's composition
If the lift cord is extended or shortened, then the bottom rail level balance is improved, but the reliability deteriorates due to potential cord stretching or contraction
Solution Approach 1:
The adjustment mechanism is designed to accommodate future cord stretching or contraction by providing a range of motion that can compensate for material expansion over time, ensuring the leveling function remains reliable even as the lift cord properties change
Data Source
AI summary
A level adjusting device for the bottom rail of a window covering is disclosed. This device has a housing having a base, a top and a sidewall extending between the base and the top. The top has an opening through which a lift cord passes. The base has a first opening through which a lift cord passes and a second opening. A spindle is positioned within the housing, such that the bottom end of the spindle is positioned over the second opening in the bottom of the housing. That bottom end is configured to receive a tool for turning the spindle. The spindle has a peripheral edge with spaced apart notches that are engaged by a projection extending from the housing. Turning the spindle causes the lift cord to be wound around or unwound from the spindle which shortens or lengthens that lift cord to level the bottom rail.