Dual Roll Blind Mechanism for Uniform Light Control
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Solution Overview
Problem
Conventional roll blinds lack a simple and durable mechanism to uniformly control light transmission across an entire glass window or glass wall, often becoming complicated and costly due to the need for separate mechanisms to control light transmission and operation, which affects their practicality and durability.
Innovation Solution
A dual roll blind system using two screens with alternating light transmission and shielding portions, driven by a single ball-chain mechanism, incorporating a clutch device and slide drive system to control the overlap and rotation of the screens, allowing simultaneous control of light transmission and opening/closing with a single driving string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two separate operating apparatus are used to control the overlapped amount of two roll screens and to control the light transmission amount, then the light transmission amount can be controlled, but the device becomes complicated and the cost increases
Solution Approach 1:
The patent combines two separate operating apparatus into a single integrated operating mechanism. The first operating apparatus controls both the first roll screen's ascent/descent and the second roll screen's overlapped amount through a shared ball chain and gear system, eliminating the need for separate control mechanisms and reducing overall device complexity.
Solution Approach 2:
The single operating apparatus is designed to perform multiple functions: it simultaneously controls the vertical movement of the first roll screen and the horizontal overlapping of the second roll screen. This multi-functional design allows one mechanism to replace what would traditionally require two separate mechanisms.
2Adaptability or versatility
If two separate operating apparatus are used to control the overlapped amount of two roll screens and to control the light transmission amount, then the light transmission control function is achieved, but the durability deteriorates
Solution Approach 1:
By merging the control functions into a single operating apparatus with a unified ball chain and gear system, the patent reduces the total number of mechanical components that could fail. The integrated design means fewer connection points and fewer moving parts overall, enhancing durability.
3Ease of operation
If a roll screen is wound up around a bar for winding fixed on upper portion to control the height, then the height control is achieved, but it is impossible to uniformly control the light transmission amount in the whole area of glass window or glass wall
Solution Approach 1:
The patent divides the window area into two independently controllable zones using two separate roll screens. The first roll screen controls the upper portion while the second roll screen controls the lower portion, allowing each to be adjusted independently to achieve uniform light transmission control across the entire window area.
Solution Approach 2:
The patent introduces horizontal overlapping movement of the second roll screen as an additional control dimension. While the first roll screen controls vertical height, the second roll screen can overlap horizontally with the first, creating a two-dimensional control system that enables uniform light transmission adjustment across the entire window area.
4Device complexity
If one roll screen with the same light transmittance in whole area is used, then the structure is simple, but the light transmission amount cannot be uniformly controlled in the whole area of glass window or glass wall
Solution Approach 1:
The patent segments the window coverage into two separate roll screens with different light transmission properties. The first roll screen has light transmitting portions and light shielding portions, while the second roll screen has complementary characteristics, allowing their overlapping areas to create uniform light transmission control across the entire window.
Solution Approach 2:
Different regions of the window are assigned different light transmission characteristics through the overlapping arrangement of the two roll screens. The first roll screen provides light transmission in certain areas while the second roll screen provides light shielding in overlapping areas, creating locally optimized light control that results in uniform overall performance.
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 system simplifies the mechanical structure, reduces costs, and enhances durability by enabling easy control of light transmission and operation, allowing for uniform light management across the entire area with a single ball-chain, while maintaining credibility through repeated operations.
Implementation Method 1
a driving wheel (50) rotating by a driving string (51) and coupled to the first axis of rotation (13) to transfer rotational force of the driving string (51) to the first gear (23) and the winding bar (31)
Implementation Method 2
a first gear (23) coupled to the first axis of rotation (13) and rotationally driving the first winding bar (31)
Implementation Method 3
a second gear (24) coupled to the second axis of rotation (14) and rotating the second winding bar (32) with rotating dependently on the first gear (23)
Data Source
AI summary
The present invention relates to a dual roll blind enabling to control its light transmission amount and open and close with one ball-chain. The dual roll blind comprises a first screen and a second screen having light transmission portions and light shielding portions, respectively, a first winding bar and a second winding bar for respectively winding the first screen and the second screen, a first axis of rotation and a second axis of rotation to which the first winding bar and the second winding bar are respectively coupled, a first gear coupled to the first axis of rotation and rotationally driving the first winding bar, a second gear coupled to the second axis of rotation and rotating the second winding bar with rotating dependently on the first gear, a driving wheel rotating by a driving string and coupled to the first axis of rotation to transfer rotational force of the driving string to the first gear and the winding bar, a slide drive device engaging with the driving wheel to receive rotational force of the driving wheel and slide the first winding bar in a longitudinal direction of the first axis of rotation.