Cordless Window Blind With Balanced Friction Spring System
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Solution Overview
Problem
Conventional window blinds with cords are prone to causing hand injuries and have high manufacturing costs due to the use of multiple winding devices with springs that lose elasticity over time, leading to inefficient operation.
Innovation Solution
A cordless window blind design that eliminates the middle beam, utilizing a coil wound around multiple wheel sets and a spring system with balanced friction and elastic force to operate the foldable slats, allowing for stable opening and closing even as the spring's elasticity weakens, and featuring removable side covers for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If cordless window blinds with winding devices and springs are used, then the operation safety is improved (no cords), but the springs are in tensile state for long and lose elasticity, and manufacturing costs increase
Solution Approach 1:
The patent removes the middle beam component from the window blind structure, extracting it to reduce weight and simplify the system. This extraction principle addresses the reliability issue by eliminating a structural element that would otherwise require additional support mechanisms with springs
Solution Approach 2:
Instead of using springs in tension to lift the blind (conventional approach), the patent inverts the approach by using a weight system where weights suspended below the lower beam provide the lifting force through gravity. This inversion eliminates the need for tensile springs that lose elasticity over time
2Ease of operation
If multiple winding devices with springs are used, then the lifting function is achieved, but the manufacturing costs increase
Solution Approach 1:
The patent merges the lifting function into a single integrated weight system rather than using multiple separate winding devices with springs. The weights and connecting rods combine multiple lifting functions into one system, reducing manufacturing complexity and cost while maintaining ease of operation
Solution Approach 2:
The weight system operates automatically through gravity - when the blind is lowered, the weights descend and naturally provide the lifting force when raised, eliminating the need for powered mechanisms or complex spring systems. The system serves itself through gravitational force
3Strength
If a middle beam is included in the window blind structure, then the structural support is provided, but the weight of the window blind increases
Solution Approach 1:
The middle beam is extracted/removed from the structure entirely. The patent achieves structural support without this component by using the upper beam, lower beam, and foldable slats in a reconfigured arrangement where the weights and connecting mechanisms provide the necessary support function without adding significant weight
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
This design reduces the weight and manufacturing costs of window blinds, ensures stable and convenient operation by balancing friction and elastic force, and extends the service life by allowing easy maintenance.
Implementation Method 1
the window blinds close owing to the gravity of the middle beam and the lower beam, and lifts up through the elastic force of the springs of the plurality of winding devices
Implementation Method 2
The friction and the elastic force of the spring are balanced so as to close or lift up the plurality of foldable slats under the action of an external force
Implementation Method 3
the window blinds close owing to the gravity of the middle beam and the lower beam
Data Source
AI summary
A window blind includes an upper beam, a plurality of foldable slats, a lower beam, a fastener, a spring, a movable base, a fixed base, a first wheel set, a second wheel set, and a third wheel set. The upper beam includes a lower part and a slideway. The plurality of foldable slats is fastened to the lower part of the upper beam and includes a lower part. The lower beam is fastened to the lower part of the plurality of foldable slats. The fastener, the spring, the movable base, and the fixed base are disposed between the upper beam and the plurality of foldable slats. The fastener and the fixed base are fixed on the upper beam. The movable base is disposed in the slideway. The spring includes two ends. The fastener includes a first hook and the movable base includes a second hook.