Blind Positioning Mechanism with Damping Reel
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Solution Overview
Problem
Non pull cord window blinds experience rebounding or sagging due to lack of effective positioning design, making them inconvenient to operate.
Innovation Solution
A blind body positioning mechanism comprising a transmission unit with rotatable wheels and a damper unit with a damping system, utilizing coil springs and oil reservoirs to provide damping resistance, ensuring the blind body remains accurately positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non pull cord window blind is designed without a positioning mechanism, then the structure is simple and easy to operate, but the blind body rebounds after fully extended or sags after fully received
Solution Approach 1:
The patent applies dynamics by making the positioning mechanism dynamically adjustable through the damper unit. The damping force can be adjusted by changing the oil viscosity or orifice size, allowing the system to adapt to different blind weights and operating conditions while maintaining reliable positioning without over-complexity
Solution Approach 2:
The positioning cord acts as an intermediary element between the blind body and the positioning mechanism. It transmits the positioning force from the spring-damper system to the blind body, enabling reliable positioning while keeping the overall structure simple and easy to operate
2Reliability
If a positioning mechanism is added to prevent rebounding and sagging, then positioning stability is improved, but the device complexity increases
Solution Approach 1:
The positioning mechanism is segmented into distinct functional modules: a spring unit for elastic restoring force, a damper unit for damping control, and a ratchet mechanism for one-way locking. This segmentation allows each component to be simple and manufacturable while collectively providing reliable positioning stability
Solution Approach 2:
The positioning mechanism is designed to be self-regulating through the spring-damper system that automatically adjusts to the blind body's weight and position. The ratchet mechanism provides automatic one-way locking without requiring additional actuators or complex control systems, maintaining simplicity while achieving reliable positioning
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 mechanism effectively prevents rebounding or sagging by balancing elastic restoring force with damping resistance, enhancing operating convenience and maintaining the blind body in desired positions.
Implementation Method 1
a coil spring (23), which is connected between the two first transmission wheels (22) and selectively wound round one first transmission wheel (22)
Implementation Method 2
The damper comprises an oil reservoir (52) and a brake gear (54). The oil reservoir (52) is fixedly mounted in the damping reel holder (40). The brake gear (54) is pivotally mounted on the oil reservoir (52)
Implementation Method 3
The brake gear (54) is pivotally mounted on the oil reservoir (52). The damping reel (60) is wound with one transmission cord (25)
Data Source
AI summary
A window body positioning mechanism of a non pull cord window blind includes a transmission unit including two first transmission wheels meshed together, a coil spring connected between the first transmission wheels and wound round one first transmission wheel, two second transmission wheels respectively meshed with one respective first transmission wheel, and two transmission cords each having one end thereof fixedly connected to one respective second transmission wheel and being wound round the respective second transmission wheel upon its rotation, and a damper unit including a damper and a reel connected to the damper and wound round by one transmission cord in such a manner that when the blind body is being extended out or received, the damper imparts a damping resistance to the transmission cords through the reel to achieve excellent positioning effects.