Narrow-Profile Blind Drive Layout for Minimal Window Gaps
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Solution Overview
Problem
Existing window blind control systems fail to minimize the gap between the window shade and the window frame effectively, leading to unwanted light infiltration and safety concerns, particularly for children, as they often rely on endless loops or flexible gear drives that can bind or flex.
Innovation Solution
A control module with a housing that locates the drive mechanism in a shell to rigidify a reduced thickness, using a single rod to activate the drive mechanism, and incorporates a spur gear or worm gear system to minimize the gap between the window shade and the window frame, with a clutch and drive gear arrangement that prevents unrolling and allows safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a thin profile drive mechanism is used to minimize the gap between the window shade and window frame, then the gap is reduced, but the drive mechanism becomes flexible and unstable, causing it to bind and wander
Solution Approach 1:
The patent uses a thin-walled spherical shell to enclose the gear drive mechanism. The shell provides structural support and rigidity to the thin profile drive while allowing the mechanism to maintain its reduced thickness. The spherical geometry distributes stresses evenly, preventing the thin structure from binding or wandering during operation.
Solution Approach 2:
The drive mechanism is divided into separate functional components (gears, shafts, clutch) that are independently positioned within the spherical shell. This segmentation allows each component to be optimized for its specific function while the overall assembly maintains a compact, stable structure that prevents binding.
2Length of stationary object
If spur gears or worm gears are used to reduce the gap, then the gap is minimized, but the drive mechanism tends to bind when used
Solution Approach 1:
The patent incorporates a clutch mechanism that dynamically engages and disengages the gear drive. The clutch allows the window shade to be lowered by gravity without gear engagement, preventing binding during descent. When raising the shade, the clutch engages the gears to provide controlled upward motion, ensuring smooth operation in both directions.
Solution Approach 2:
The clutch acts as an intermediary between the manual crank and the gear mechanism. It selectively transmits or blocks power flow depending on the operation direction, allowing the heavy window shade to descend freely under gravity while preventing the gears from binding during controlled ascent.
3Ease of operation
If an endless loop control element is used, then the blind can be operated, but it creates safety concerns for children
Solution Approach 1:
The patent removes the endless loop control element from the system and replaces it with a localized manual crank mechanism integrated into the window shade assembly. This extraction eliminates the dangling cord hazard while maintaining the ability to operate the blinds through a safe, contained control interface.
Solution Approach 2:
The manual crank mechanism is self-contained within the window shade assembly, allowing users to operate the blinds directly at the window without requiring external control elements. The clutch mechanism automatically engages and disengages based on operation direction, providing intuitive, safe operation without exposed cords or chains.
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 effectively reduces the gap between the window shade and frame, minimizing light infiltration while ensuring safe and secure operation, particularly by using a single rod to activate the drive mechanism, thus addressing both functionality and safety concerns.
Implementation Method 1
The drive gear is a worm gear engageable with the spur gear
Implementation Method 2
a drive gear engageable at one end of the clutch for rotatably driving said clutch and window shade roll, said drive gear disposed in said housing adjacent said control end wall
Implementation Method 3
These clutch mechanisms have generally been used in the window covering industry to inhibit the unwanted unrolling of window blinds
Data Source
AI summary
A blind control for a window covering having a narrow profile; and particularly relates to a control module for a window shade where the location of the drive mechanism is selected to minimize the gap between the end of the window shade and inside edge of a window opening; locating the drive mechanism in a shell disposed in a housing to rigidify a reduced thickness of the drive so as to minimize the gap; and use a single rod depending from the control module to activate the drive mechanism in a safe and secure manner.The invention also includes a housing with an end wall adjacent one end of the shade; a clutch projecting from said end wall and rotatable about a clutch axis, a drive gear engageable at one end of the clutch for rotatably driving said clutch and shade, said drive gear disposed in said housing adjacent said end wall; and a wand for driving said drive gear.The invention provides for a wand to raise and lower the window shade.