Window Blind Cord Guide With Blocking Surface Against Jamming

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Solution Overview

Problem

Conventional cord guiding devices for window blinds often experience jamming due to uneven force application, causing the cord to slip out of the guiding wheels and become loosely wound, leading to improper blind operation.

Innovation Solution

A cord guiding device with a wheel holder, guiding wheels, and a cord-blocking unit that includes protruding flanges and a blocking surface to prevent the cord from slipping off the wheel surface, ensuring secure winding and smooth operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the cord is loosely wound on the wheel surface of the guiding wheel, then the cord can move freely for blind operation, but the cord may slip out of the protruding flanges and cause jamming

Engineering Contradiction:

Improvecord movement freedomVSAvoidcord retention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The cord-blocking unit is installed on the wheel holder to create a preliminary barrier that prevents the cord from slipping off the guiding wheel. The blocking surface of the cord-blocking unit faces the wheel surface and stops the cord before it can escape beyond the protruding flanges, thus preventing jamming while maintaining operational freedom

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If the cord is tightly wound on the wheel surface, then the cord remains secure, but uneven force application causes the cord to slip and become loosely wound

Engineering Contradiction:

Improvecord securityVSAvoidblind folding and unfolding

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cord-blocking unit acts as an intermediary component between the cord and the guiding wheel. It provides a controlled boundary that maintains cord tension during operation while preventing uncontrolled slippage. The blocking surface guides the cord to remain properly positioned on the wheel surface without requiring excessive tightness

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of repair

If the cord slips out of the protruding flanges, then the cord can be easily repositioned, but jamming occurs between the guiding wheel and wheel holder

Engineering Contradiction:

Improvecord repositioningVSAvoidjamming

Core Design Contradiction:

Ease of repairVSObject-generated harmful factors

Solution Approach 1:

The cord-blocking unit prevents the harmful condition of cord slippage before it can occur. By blocking the cord on the wheel surface, it eliminates the possibility of the cord escaping beyond the protruding flanges and causing jamming between the guiding wheel and wheel holder

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS8925615B2Cord guiding device for a window blind

Publication Date: 2015.01.06 LIN KE MIN

AI summary

A cord guiding device for a window blind includes a wheel holder, a guiding wheel and a cord-blocking unit. The guiding wheel is rotatably mounted on the wheel holder, and includes two protruding flanges that are spaced apart from each other, and has a wheel surface that is defined and disposed between the protruding flanges and that is adapted for a cord of the window blind to wind thereon. The cord-blocking unit is mounted on the wheel holder, and has a blocking surface that faces and is disposed proximate to the wheel surface of the guiding wheel for preventing the cord from slipping off the wheel surface and out from the protruding flanges.