Window Covering Cord Tension Fixing with Slack-Lock Mechanism
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Solution Overview
Problem
Existing window covering cord loop fixers are ineffective when improperly installed or loose due to material stretching, leading to potential accidents from entanglement and strangulation risks.
Innovation Solution
A tension fixing device with a housing, pushed member, biasing member, and locking mechanism that adjusts tension in the operating cord loop, ensuring it remains taut by embedding a positioning post into a through hole when slack, requiring manual intervention to restore operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pull cord fixer is installed to secure the cord loop, then safety against entanglement and strangulation is improved, but the device becomes ineffective when improperly installed or when the cord loop stretches over time
Solution Approach 1:
The patent employs a dynamic adjustment mechanism where the housing can be repositioned along the cord loop at different locations. This allows the tension fixing device to adapt to changing tension conditions over time, maintaining its safety function even as the cord loop stretches or sags. The device transitions from a static fixed position to a dynamic adjustable position system.
Solution Approach 2:
The patent changes the parameter of position location, allowing the housing to be moved to different positions along the cord loop. By adjusting this spatial parameter, the device maintains optimal tension fixing capability despite changes in cord loop tension over time, ensuring continuous safety effectiveness.
2Ease of operation
If the cord loop is allowed to hang freely for ease of operation, then user convenience is improved, but the cord loop may sway and become entangled with nearby objects
Solution Approach 1:
The patent introduces a tension fixing device as an intermediary element between the cord loop and the window frame. This intermediary device provides a fixed anchoring point that prevents the cord loop from swaying freely while still allowing controlled operation. The device mediates between complete freedom (causing entanglement) and complete restriction (causing operational difficulty).
3Reliability
If the cord loop is secured tightly to prevent swaying, then safety against entanglement is improved, but the operating cord may become difficult to pull and control
Solution Approach 1:
The patent applies local quality by creating a localized tension fixing point at the housing position while leaving the rest of the cord loop relatively free. The fixing device concentrates the restraint function at a specific location rather than uniformly restricting the entire cord loop, thereby maintaining safety at the anchoring point while preserving operational ease elsewhere.
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
Prevents accidental operation of the window covering when the cord loop is loose, ensuring safety by requiring manual adjustment to restore tension, thus reducing entanglement hazards.
Implementation Method 1
A biasing member has an end abutting against the bottom plate of the pushed member, and the other end abutting against the opposite side of the locking member with respect to the wheel body. The biasing member provides a pushing force tending to push the pushed member and the locking member away from each other
Data Source
AI summary
A tension fixing device for tensioning an operating member of a window covering, includes a housing, a pushed member, a wheel body disposed on the pushed member, a locking member fixed within the housing between the wheel body and a bottom plate of the pushed member, and a biasing member disposed between the bottom plate and the locking member. When the operating member is tensioned, causing the pushed member to move so that the wheel body is spaced from the locking member by a gap larger than the diameter of the operating member, the operating member can move with respect to the locking member. When the operating member is slack such that the biasing member forces the pushed member to move, causing the gap to be smaller than the diameter of the operating member, the locking member interferes with the operating member to restrict the operating member from moving.