Window Blind Auxiliary Adjusting Module Cord Length Control
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Solution Overview
Problem
Conventional window blinds struggle to effectively block light due to the weight and dimension of the bottom rail counteracting the tilt mechanism, resulting in incomplete closure and light leakage, especially near the bottom rail.
Innovation Solution
The window blind incorporates an auxiliary adjusting module with a follower and cord adjusting member, which adjusts the lengths of the cords to ensure proper alignment and closure of the slats and bottom rail, using an elastic member to provide a pushing force and move the cord adjusting member to optimize cord lengths for complete vertical alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the tilt wand is used to tilt the slats and bottom rail to a vertical position, then the visibility and light blocking is improved, but the weight and dimension of the bottom rail counteract the driving force and distort the ladder string shape, preventing complete closure
Solution Approach 1:
The patent introduces an auxiliary adjusting module that includes a cord adjusting member and elastic member. The elastic member provides a pushing force that counteracts the weight of the bottom rail, enabling the tilt mechanism to overcome the gravitational force and achieve complete vertical closure of the slats and bottom rail.
Solution Approach 2:
The cord adjusting member acts as an intermediary between the tilt wand and the bottom rail. It transmits and amplifies the driving force from the tilt wand while compensating for the weight of the bottom rail, allowing the ladder string to achieve its ideal inverted V-shape configuration for complete light blocking.
2Manufacturing precision
If the ladder string is distorted by the bottom rail weight, then the slats near the headrail can abut each other, but the lower slats near the bottom rail cannot be fully closed
Solution Approach 1:
The patent changes the parameters of the cord system by introducing an adjustable cord length mechanism. The cord adjusting member can modify the length and tension of the cord, thereby changing the geometric parameters of the ladder string to achieve the ideal inverted V-shape that enables complete closure of all slats including those near the bottom rail.
3Device complexity
If the tilt mechanism is simplified without the auxiliary adjusting module, then the device complexity is reduced, but the precision of cord length adjustment and complete closure capability are compromised
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism through the cord adjusting member and elastic member. This dynamic system allows the cord length and tension to be adjusted in real-time based on the position and weight of the bottom rail, enabling precise control of the ladder string shape and complete closure of the slats without excessive structural complexity.
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
This solution allows for precise control and complete closure of the window blind, effectively blocking light and minimizing visibility, especially near the bottom rail, by adjusting cord lengths to accommodate the weight and dimensions of the bottom rail.
Implementation Method 1
using an elastic member to provide a pushing force and move the cord adjusting member to optimize cord lengths
Data Source
AI summary
A window blind has a headrail, a bottom rail, and multiple slats provided below the headrail. In the headrail, an adjusting shaft and an auxiliary adjusting module are provided and connected. A ladder string is connected to the adjusting shaft, whereby the adjusting shaft adjusts a shape of the ladder string to tilt the slats and the bottom rail. A first cord and a second cord extend out of the headrail and are connected to opposite sides of the bottom rail. When the adjusting shaft drives the slats to tilt in a direction, the auxiliary adjusting module releases the first cord out of the headrail and retracts the second cord into the headrail. When the slats are tilted in an opposite direction, the auxiliary adjusting module retracts the first cord into the headrail and releases the second cord out of the headrail.