Modular Window Covering Drive Unit with Adjustable Pulley
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Solution Overview
Problem
Existing window covering drive units often require increased torque at the cost of reduced speed, which is inconvenient for lighter or smaller window coverings, leading to stock management issues and increased complexity in the supply chain due to the need for multiple drive units.
Innovation Solution
A modular operating unit with a rotatable drive pulley and engagement device that allows for two different drive units to be created from identical components, featuring a brake mechanism and adjustable mounting positions to accommodate varying window covering sizes, enabling easy conversion between drive unit types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If drive units are designed with increased torque for heavier window coverings, then the torque capability is improved, but the operating speed is reduced which is inconvenient for lighter or smaller window coverings
Solution Approach 1:
The drive pulley is designed with a movable mounting position that can be adjusted between at least two positions along the drive shaft. This dynamic reconfiguration allows the same drive unit to provide different gear ratios - one optimized for high torque with heavier coverings and another optimized for higher speed with lighter coverings. The engagement device with selectively engageable pins enables this dynamic adjustment without requiring multiple complete drive units.
2Adaptability or versatility
If multiple different drive units are offered for differently sized window coverings, then the adaptability to different window covering sizes is improved, but the stock management complexity and supply chain difficulties increase
Solution Approach 1:
The drive unit is designed as a universal platform that can serve multiple functions by adjusting the mounting position of the drive pulley. The same housing, drive shaft, and engagement device can accommodate different pulley positions to match different window covering weights and sizes. This multi-functionality eliminates the need to maintain separate inventory of different drive unit types, as a single universal drive unit can be configured for various applications.
Solution Approach 2:
The drive unit is segmented into modular components - the drive pulley is separable from the housing and can be repositioned along the drive shaft. The engagement device with multiple pins is designed as an independent module that can be selectively engaged. This segmentation allows flexible reconfiguration of the same components to create different drive characteristics without requiring complete separate assemblies.
3Ease of manufacture
If a single universal drive unit design is used for all window covering sizes, then the manufacturing cost and stockkeeping simplicity are improved, but the performance optimization for specific window covering sizes is reduced
Solution Approach 1:
The universal drive unit incorporates a dynamically adjustable drive pulley mounting system that allows the pulley to be positioned at different locations along the drive shaft. This dynamic adjustment capability enables the same manufactured unit to be optimized for different performance requirements - high torque for heavy coverings or higher speed for light coverings - without requiring different manufacturing processes or component sets.
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 solution reduces stockkeeping and supply chain complexities by allowing for the creation of multiple drive units from a common set of components, simplifying assembly and operation, and enabling cost-effective production while providing a useful choice for different window covering sizes.
Implementation Method 1
a brake mechanism for, in use, arresting the engagement device when the drive pulley is not rotated and preventing the engagement device and drive pulley from being back driven by the window covering
Data Source
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AI summary
An operating unit (5) for operating a window covering. The operating unit (5) includes a housing (11), a rotatable drive pulley (13) having an axis of rotation and first and second mounting positions in the housing, with respect to the axis of rotation, an engagement device (15), rotatable about the axis of rotation, and a brake mechanism (45, 47, 49) for, in use, arresting the engagement device when the drive pulley (13) is not rotated and preventing the engagement device and drive pulley from being back driven by the window covering. The engagement device (15) has a plurality of circumferentially spaced pins (19) parallel to the axis of rotation. The drive pulley (13) has a corresponding plurality of openings (17) facing the pins (19). In the first mounting position, the pins on the engagement device (15) engage with the corresponding openings (17) in the drive pulley and the engagement device rotates with the drive pulley. In the second mounting position, the pins (19) do not so engage and the engagement device (15) thereby can rotate relative to the drive pulley (13).