Double-Layer Cord Rolling Device for Window Blinds
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Solution Overview
Problem
Existing window blind cord rolling devices often interfere with other components due to their length, necessitating a shorter design without compromising functionality.
Innovation Solution
A double-layer cord rolling device comprising a driving unit, a cord rolling unit, and a transmission member, where the driving unit and cord rolling unit are combined in a stacking manner, with the transmission member enabling synchronous operation to reduce overall length while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cord rolling device is made shorter to avoid interfering with other components, then the device compactness is improved, but the synchronous operation between driving unit and cord rolling unit becomes difficult to maintain
Solution Approach 1:
The patent transitions from a horizontal arrangement to a vertical stacking arrangement, placing the driving unit and cord rolling unit in different vertical layers. This dimensional change allows both units to be compact in horizontal space while maintaining their functional separation and synchronous operation through vertical alignment of transmission components.
Solution Approach 2:
The transmission member is nested within the vertical space between the driving unit and cord rolling unit, with its transmission portion positioned between the two units. This nesting approach allows the transmission mechanism to be integrated into the compact vertical structure without adding horizontal length, while still enabling synchronous operation.
2Device complexity
If the driving unit and cord rolling unit are arranged horizontally, then the transmission mechanism is simple, but the overall device length increases causing interference with other components
Solution Approach 1:
The patent reconfigures the transmission mechanism to operate in the vertical dimension rather than horizontally. The transmission member extends vertically between the driving unit and cord rolling unit, allowing power transmission without increasing horizontal device length, thus avoiding interference with other components while maintaining manageable complexity.
3Volume of moving object
If the cord rolling device is miniaturized, then the space utilization is improved, but the structural complexity increases to maintain synchronous operation
Solution Approach 1:
The patent merges the transmission member with the vertical stacking structure, where the transmission member's first and second portions are integrally connected and positioned between the driving unit and cord rolling unit. This merging approach enables compact vertical integration without requiring separate complex transmission components, achieving miniaturization while controlling structural complexity.
Solution Approach 2:
The transmission mechanism is nested within the vertical space created by stacking the driving unit and cord rolling unit. The transmission member fits between these two units, utilizing the vertical dimension for power transmission without adding to the overall device volume, thus achieving miniaturization with manageable structural complexity.
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 achieves miniaturization of the cord rolling device without affecting its operation, preventing interference with other window blind components.
Implementation Method 1
a torsion spring connected with the first shafts of the upper wheels
Implementation Method 2
The first gears of the upper wheels are engaged with each other, and the second gears of the lower wheels are engaged with each other
Implementation Method 3
two transmission cords connected with the second shafts of the lower wheels respectively
Data Source
AI summary
A double-layer cord rolling device includes a driving unit and a cord rolling unit disposed under the driving unit. The driving unit has an upper base, two upper wheels rotatably disposed on the upper base, and a torsion spring connected with the upper wheels. The cord rolling unit has a lower base, two lower wheels rotatably disposed on the lower base and coaxially mating with the upper wheels, and two transmission cords respectively connected with the lower wheels. One of the upper wheels is connected with one respective lower wheel through a transmission member, thereby rotatable synchronously. As a result, the double-layer cord rolling device of the present invention is shortened in length on the whole without affecting its functioning, thereby attaining the effect of miniaturization.