Window Shade Rotary Drum with Movable Impeding Part
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Solution Overview
Problem
Conventional window shade actuating systems require additional space for a separate limiting mechanism, making them more complex and less efficient in operation.
Innovation Solution
Integration of a limiting mechanism with the winding unit of the window shade, utilizing a movable impeding part that engages with a fixed protrusion to stop the rotary drum's rotation, thereby reducing overall system space and ensuring consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate limiting mechanism is provided to stop the rotary drum at the lowermost position, then the window shade can be operated in a consistent manner, but the structure becomes more complex and requires additional space for assembly
Solution Approach 1:
The limiting mechanism is merged with the winding unit by integrating the impeding part directly into the rotary drum structure. The impeding part is formed as an extension of the rotary drum itself, eliminating the need for a separate limiting mechanism and reducing overall structural complexity while maintaining consistent operation.
Solution Approach 2:
The rotary drum is designed to serve multiple functions: it winds the suspension member, provides structural support, and incorporates the impeding part that acts as the limiting mechanism. This multi-functionality reduces the number of separate components needed in the system.
2Reliability
If a separate limiting mechanism is provided to stop the rotary drum at the lowermost position, then the window shade can be operated in a consistent manner, but additional space is required for assembly
Solution Approach 1:
The limiting mechanism is merged with the winding unit by integrating the impeding part directly into the rotary drum structure. The impeding part is formed as an extension of the rotary drum itself, eliminating the need for a separate limiting mechanism and reducing overall structural complexity while maintaining consistent operation.
3Reliability
If the impeding part is always engaged with the protrusion, then the rotary drum cannot rotate beyond the lowermost position, but the window shade cannot be lowered at all
Solution Approach 1:
The impeding part is designed to be movable relative to the rotary drum, allowing it to dynamically engage with or disengage from the fixed protrusion on the casing. This dynamic positioning enables the limiting mechanism to function only when needed (at the lowermost position) while not interfering with normal lowering operations.
Solution Approach 2:
The impeding part is positioned to prevent rotation beyond the lowermost position only when the window shade reaches that position. The geometry of the impeding part and fixed protrusion is designed such that engagement occurs naturally at the lowermost position without requiring additional forces or actions to activate the limiting function.
Data Source
AI summary
An actuating system for a window shade includes a suspension member, a casing having a fixed protrusion, a transmission axle disposed through the casing, a rotary drum arranged in the casing and rotationally coupled with the transmission axle, and an impeding part connected with the rotary drum and affixed with an end of the suspension member. The rotary drum is rotatable in a first direction for winding the suspension member, and in a second direction for unwinding the suspension member. The impeding part is movable relative to the rotary drum between a first and a second position, the impeding part when in the first position being movable with the rotary drum past the protrusion in any of the first and second direction, and the impeding part when in the second position being engageable with the protrusion to block rotation of the rotary drum in the second direction.