Modular Shaft Brake for Retractable Covering Drive
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Solution Overview
Problem
Existing winding shaft drives for retractable architectural coverings face challenges with varying window sizes, requiring differently sized shaft brakes and spring assistance to counter weight, which complicates assembly and adjustment, and often results in noise and wear issues due to uneven lubrication distribution.
Innovation Solution
A modular design separating the shaft brake from the driving member, incorporating a preassembled shaft brake module with adjustable coupling mechanisms and a spring assist module, allowing for pretensioning and improved lubrication distribution, and optional auxiliary shaft brakes for enhanced holding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the shaft brake force is increased to accommodate larger window coverings, then the holding capacity is improved, but the volume of the driving member increases and light gaps occur
Solution Approach 1:
The shaft brake is separated from the driving member into a distinct, removable module. This allows the driving member to maintain a compact size suitable for small windows while the shaft brake module can be independently sized or configured to provide adequate braking force for larger window coverings without increasing the driving member's volume.
Solution Approach 2:
The shaft brake module is designed to be accommodated within the hollow winding shaft, nesting the braking mechanism inside the existing structural space. This eliminates the need to increase the driving member's external dimensions while still providing sufficient brake force for various window sizes.
2Adaptability or versatility
If differently sized shaft brakes are provided for various window sizes, then the adaptability is improved, but the device complexity and stock keeping requirements increase
Solution Approach 1:
The shaft brake module is designed as a universal, interchangeable component that can be used with different window covering sizes. The module incorporates adjustable features such as variable spring tension and configurable brake arm positioning, allowing a single standardized module to provide appropriate braking force for various window dimensions without requiring multiple specialized components.
Solution Approach 2:
The shaft brake module includes adjustable mechanisms that allow the braking characteristics to be dynamically tuned to match different window covering weights and sizes. This enables one modular design to adapt to multiple applications through adjustment rather than requiring multiple fixed designs.
3Ease of operation
If spring assistance is added to counter the weight of larger window coverings, then the ease of operation is improved, but the difficulty of adjustment and pretensioning increases
Solution Approach 1:
The spring assistance module is pre-assembled and pre-tensioned as a complete unit within the shaft brake module before installation. The spring pretensioning is performed during manufacturing under controlled conditions, eliminating the need for field adjustment. The entire pre-assembled module is then installed as a single unit, simplifying the installation process while maintaining the desired operational characteristics.
4Device complexity
If the shaft brake is integrated with the driving member, then the device complexity is reduced, but the volume of the driving member increases
Solution Approach 1:
The shaft brake is separated from the driving member into a distinct, removable module. This allows the driving member to maintain a compact size suitable for small windows while the shaft brake module can be independently sized or configured to provide adequate braking force for larger window coverings without increasing the driving member's volume.
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 design reduces the volume of the driving member, minimizes light gaps, simplifies assembly, maintains spring assist pretension, and reduces noise and wear by ensuring consistent lubrication distribution, while providing adjustable braking torque and holding force for various window sizes.
Implementation Method 1
a shaft brake adapted to be operated by the driving member, wherein the shaft brake includes a preassembled module for accommodation in the at least partially hollow winding shaft
Implementation Method 2
it has also become popular to use spring assistance in retractable window coverings to counter the extra weight of larger sizes, so that manual or motor driven operation is less affected by gravity
Implementation Method 3
the inner brake sleeve, for frictional engagement by the or each wrap spring, has a lubrication groove helically wound about an outer friction surface thereof
Data Source
AI summary
A winding shaft drive (1, 1A, 101, 101A, 102, 102A) is arranged for operating a retractable covering for an architectural opening. The winding shaft drive includes an at least partially hollow winding shaft (7); a driving member (3, 103) for inducing rotation to the winding shaft; and a shaft brake adapted to be operated by the driving member. The shaft brake includes a preassembled module (5) for accommodation in the at least partially hollow winding shaft (7) and has first coupling means (67) on one axial end thereof for transmitting rotative forces and second coupling means (69) on the same one axial end for transmitting non-rotative stationary forces. The driving member has a driving hub (11, 111) for removably coupling to the first coupling means (67) and a stationary connector (17, 17A, 117, 117A) for removably coupling to the second coupling means (69). A shaft brake module (5) and a driving member (3, 103) are specifically adapted for use in the winding shaft drive.