Cordless Safety Blind With Nested Lift Cords and Bevel Gear Drive
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Solution Overview
Problem
Conventional blinds with exposed lift cords pose safety risks and are inconvenient to operate, as they can cause accidents and are difficult to install due to the external exposure of pulling strings and cords.
Innovation Solution
A cordless safety blind design featuring conical fabric tubes for ladder cords with lift cords inserted inside, a rotary body, and a driving unit with a rotary gear and elastic gear that allows for easy up/down and tilting of slats using a central shaft, eliminating external cord exposure and enhancing safety and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lift cords are exposed to the outside for easy operation, then ease of operation is improved, but safety is worsened due to potential accidents
Solution Approach 1:
The lift cords are nested inside the ladder cords, which are in turn nested inside the blind structure. This hierarchical nesting conceals the lift cords while maintaining operational functionality, resolving the contradiction between ease of operation and safety by making cords inaccessible yet functional.
Solution Approach 2:
The ladder cords serve as an intermediary structure that houses the lift cords. This intermediary element allows the lift cords to remain functional while preventing direct exposure, thus eliminating the safety hazard while preserving operational capability.
2Ease of operation
If pulling strings are exposed to the outside for operation, then ease of operation is improved, but safety is worsened due to potential accidents
Solution Approach 1:
The pulling strings are nested within the blind structure, integrated into the slat mechanism. This nesting conceals the pulling strings while maintaining their functional connection to the slats, resolving the contradiction by making cords inaccessible yet operational.
Solution Approach 2:
The slats and their connection mechanisms serve as intermediaries that transmit the pulling force without requiring exposed strings. This intermediary mechanism eliminates the safety hazard of exposed pulling strings while preserving the ability to operate the blind.
3Ease of operation
If cords are exposed to the outside for operation, then ease of operation is improved, but installation convenience is worsened
Solution Approach 1:
The lifting mechanism and cord system are merged into a single integrated structure where the ladder cords and lift cords work together as one unit. This merging simplifies installation by eliminating the need to separately manage and install exposed cords, while maintaining operational functionality.
Solution Approach 2:
The nested structure of lift cords within ladder cords creates a self-contained unit that is easier to install as a single assembly rather than separate exposed components, resolving the installation convenience issue while preserving ease of operation.
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 prevents safety accidents by concealing lift cords and simplifies the operation of blinds, ensuring safe and easy movement of slats while maintaining compatibility with various blind types like Venetian and roll blinds.
Implementation Method 1
a rotary gear disposed in a groove of a body and an elastic gear in which a hook of a plate spring is disposed are engaged with each other in the form of a bevel gear to change the direction of a restoring force of the plate spring at 90 degrees using the bevel gear
Implementation Method 2
an elastic gear in which a hook of a plate spring is disposed are engaged with each other
Implementation Method 3
ladder cords in which conical fabric tubes having insertion holes formed through centers of tops of insertion grooves in which slats are inserted, and fabric bodies having tilting cords at both ends are formed in several layers, and lift cords are inserted in the insertion holes
Data Source
AI summary
The present invention relates to a safety blind that operates without a cord. More specifically, there is no danger of safety accidents because a lifting cord inserted into a fabric tube of a leather cord is not exposed to the outside, the lifting and tilting operation of an entire slat can be easily and simply performed by operating a lower slat, and a driving unit can be applied to Venetian blinds, roll blinds, and various blinds.