Telescopic Pull Cord Arrangement for Childproof Blind Control
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Solution Overview
Problem
Existing pull cord mechanisms for roller blinds and venetian blinds are not childproof, user-friendly, especially for disabled individuals, and can be bulky for large windows, posing risks of strangulation and interference with decorations.
Innovation Solution
A pull cord arrangement featuring a telescopic rod with a locking element and a carrier, where the pull cord is encased within a slit in the first rod, providing a gear change that reduces the stroke length and visibility, and includes a connecting element with projections for engaging the pull cord, allowing intuitive operation and protection from being a plaything or interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the endless cord is freely exposed, then the operation is simple, but it poses strangulation and choking risks to children
Solution Approach 1:
The pull cord is nested inside the hollow rod, with only the control button exposed externally. The cord runs through the rod's interior cavity, eliminating exposure hazards while maintaining operational functionality through the control button interface
2Object-affected harmful factors
If the control button is used to engage the cord, then the mechanism is childproof, but it is difficult to understand how to operate
Solution Approach 1:
The control button is designed with a biasing mechanism that provides tactile feedback and automatic engagement/disengagement. The button's mechanical design intuitively indicates its function through physical interaction, making operation self-explanatory without requiring complex instructions
3Ease of operation
If the rod length is adapted to full window height, then the control button can reach any position, but the rod becomes bulky for large windows
Solution Approach 1:
The rod is designed as a telescopic structure with nested segments that can extend and retract. This segmentation allows the rod to achieve full window height coverage when needed while maintaining a compact form factor when retracted, eliminating the bulkiness of a permanently extended rod
4Ease of operation
If the pull cord is long to cover full window height, then the blind can be controlled at any position, but it interferes with decorations and appears as a plaything
Solution Approach 1:
The pull cord is nested inside the hollow rod, eliminating the need for a long external cord. The cord extends only as far as necessary within the rod's interior, preventing interference with window decorations while maintaining full control range through the rod's mechanical advantage system
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 provides a childproof, user-friendly mechanism that reduces the length and visibility of the pull cord, minimizing the risk of strangulation and interference, while being easier to operate for disabled users and adaptable to various window sizes without bulkiness.
Implementation Method 1
providing a gear change that requires a reduced length of the stroke required to release or wind the blind
Implementation Method 2
The second rod further comprises in a surface facing the slit a locking element engaging the carrier
Data Source
AI summary
The invention refers to a pull cord arrangement for a roller blind or a venetian blind, comprising a winding element (4) arranged to be connected to a blind (6) such that the blind (6) is released or wound in response to a rotational movement of the winding element (4) about a rotational axis; a connecting element (28) coupled to the winding element (4) to rotate together with the winding element (4); and a pull cord (50) engaging the connecting element (28) so as to control the rotation of the connecting element (28) and thus the winding element (4) as the pull cord (50) is operated.