Window Blind Roller Coupling Mechanism for Safety Release
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Solution Overview
Problem
Conventional safety window blind control apparatuses experience unsteady engagement between components due to tolerance connections, affecting torque transmission and control, leading to potential accidents from accidental cord entanglement.
Innovation Solution
A control apparatus with a housing having front and rear mounts, a roller, and a coupling mechanism that includes a front coupling member, a rear coupling member, and a resilient member, allowing the roller to move from a driving position to a releasing position upon excess downward force, ensuring secure and steady rotation and disengagement to prevent entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the roller is resiliently supported by support members and sliders at front and rear sides, then the roller can be easily installed and removed, but the tolerance connection results in unsteady engagement affecting torque transmission
Solution Approach 1:
The coupling mechanism allows the rear coupling member to move dynamically along the axis while maintaining rotational synchronization. The resilient member enables the rear coupling member to flexibly adjust its position, absorbing tolerance variations and maintaining steady engagement during normal operation, while still allowing easy removal when needed
2Ease of manufacture
If both support member and slider are movable in front-and-rear direction relative to housing, then assembly is simplified, but unsteady engagement occurs affecting control
Solution Approach 1:
The resilient member acts as an intermediary between the rear coupling member and the housing, absorbing the movements of both the support member and slider. It converts their individual movements into a coordinated motion that maintains steady engagement of the coupling mechanism while preserving the simplicity of assembly
3Reliability
If the roller is firmly fixed to prevent movement, then torque transmission is steady, but safety release mechanism cannot function
Solution Approach 1:
The coupling mechanism transitions from a static firm connection to a dynamic system that adapts its rigidity. During normal operation, the resilient member maintains steady engagement for reliable torque transmission. During safety release, the excessive force overcomes the resilient force, allowing the roller to disengage freely, thus providing both stability and safety adaptability
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 provides a stable and secure mechanism for rotating the window blind shaft, ensuring steady torque transmission and safe disengagement of the roller from the housing to prevent accidental strangulation, enhancing safety and operational reliability.
Implementation Method 1
a resilient member which is disposed to apply the rearward resilient force to the rear coupling member
Data Source
AI summary
A control apparatus for controlling rotation of a shaft about an axis includes a roller releasably and rotatably connected to a rear housing mount of a housing that is firmly secured to a wall, an operating cord looped on the roller, a front coupling member co-rotatably coupled with the shaft, and a rear coupling member releasably connected to the roller by a rearward resilient force of a resilient member and movable and non-rotatable relative to the front coupling member. The roller is moved, upon an excess downward pulling force, to a releasing position, where the rear coupling member is moved forwardly to release connection with the roller so as to permit removal of the roller from the housing.