Self-Contained Roller Shade Tensioning via Spring-Mediated Pulley
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Solution Overview
Problem
Existing motorized roller shade systems for skylights are inefficient due to high motor stress from fabric tension, complexity in control, and difficulty in installation, especially when dealing with non-vertical window orientations.
Innovation Solution
A self-contained tensioned roller shade system featuring a free-standing frame, pulley system, and tensioning cord mechanism that minimizes motor stress by distributing fabric tension forces through a pulley and spring system, allowing for easy installation and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a dual-motor tensioning system is used to provide tension to the shade fabric in skylight applications, then the fabric tension is maintained, but the motors become larger and noisier due to the stress from fabric tension
Solution Approach 1:
A spring mechanism is introduced as an intermediary between the motor and the shade fabric. The spring absorbs and stores the tension forces, allowing the motor to operate without directly承受ing the full fabric tension. This mediator enables the motor to be smaller while still maintaining adequate fabric tension through the spring's elastic force.
Solution Approach 2:
The spring acts as a counterweight system that balances the fabric tension. By positioning the spring to oppose the fabric's gravitational pull, the motor only needs to overcome the difference between fabric weight and spring force, rather than the full fabric tension, thereby reducing motor size and power requirements.
2Power
If a spring-biased roller tube is used to provide tension, then the motor size is reduced, but the shade fabric length is limited by the spring capacity
Solution Approach 1:
The system uses a dynamic spring mechanism that can be adjusted and reset. As the shade fabric is lowered, the spring extends to maintain tension; when raised, the spring compresses and can be reset to its initial state. This dynamic behavior allows the same spring to accommodate varying fabric lengths beyond what a static spring system could handle.
Solution Approach 2:
The spring undergoes periodic compression and extension cycles as the shade operates. Each cycle resets the spring to its original state, enabling repeated use for the full range of fabric lengths. This periodic action allows the system to handle longer fabrics by resetting the spring's energy storage capacity with each operation cycle.
3Reliability
If all system components are individually installed in the opening, then the tensioning system can be properly assembled, but the installation becomes rather difficult for skylight windows
Solution Approach 1:
Multiple components (roller tube, spring mechanism, tensioning elements, and mounting brackets) are pre-assembled into an integrated unit before delivery to the installation site. This merging of components into a single assembly reduces the number of separate installation steps and allows the entire tensioning system to be installed as one unit, significantly simplifying skylight installation while maintaining proper system configuration.
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 system reduces motor stress, simplifies control, and facilitates easy installation by containing fabric and tensioning forces within a free-standing frame, enabling efficient operation and scalability for various window sizes and orientations.
Implementation Method 1
The first spring is coupled to the frame and is operatively coupled to the first tensioning cord portion, such that the hembar is biased towards the second frame end
Implementation Method 2
The first pulley is located in the first side channel and is operatively coupled to the frame adjacent the distal end of the first side channel. The first tensioning cord portion is windingly received around the first pulley
Implementation Method 3
The roller tube is rotatably mounted between the proximal ends of the first and second side channels adjacent the first frame end. The first fabric end of the shade fabric is connected to the roller tube, such that the shade fabric is windingly received around the roller tube
Implementation Method 4
The flexible shade fabric typically includes a weighted hembar at a lower end of the shade fabric, such that the shade fabric is pulled down by gravity and simply hangs in front of the window
Data Source
AI summary
A self-contained tensioned roller shade system that can be easily installed in an opening, such as a window or a skylight. The roller shade system comprises a free-standing frame, a roller tube rotatably mounted between first and second side channels of the frame adjacent a first end of the frame, and a shade fabric is windingly received around the roller tube. A tensioning cord is operatively coupled between the roller tube and a second fabric end opposite the first fabric end, and is windingly received about the roller tube. A pulley is operatively coupled to the frame adjacent the second frame end and windingly receives the tensioning cord. The tensioning cord is adapted to bias the second fabric end toward the second frame end, the second fabric end of the shade fabric adapted to move between the first and second frame ends as the roller tube is rotated.