Curl Spring Cover Segmentation for Window Sash Counterbalance
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Solution Overview
Problem
Existing counterbalance curl spring systems for vertically movable window sash are limited by integral structures that restrict the width of curl springs, reducing their lifting force and ability to counterbalance heavier sashes, as the protective cover occupies space within the jamb channel.
Innovation Solution
Separating the protective cover from the spring mount allows the cover to be disposed partially outside the jamb channel, enabling wider curl springs that can occupy the full available space, thereby increasing the lifting force by allowing the springs to be wider and counterbalance heavier sashes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the protective cover is integrated with the spring mount entirely within the jamb channel, then the cover protects the curl springs from dirt, but the cover occupies space that restricts the width of the curl springs, reducing their lifting force
Solution Approach 1:
The protective cover is separated from the spring mount, allowing the cover to be positioned partially outside the jamb channel while the mount remains inside. This segmentation enables the springs to occupy the full width of the jamb channel for maximum lifting force while the cover provides protection without spatial conflict.
Solution Approach 2:
The cover is repositioned from a purely internal configuration to a partial external configuration, extending partially outside the jamb channel. This dimensional change allows the cover to maintain its protective function while eliminating the space conflict that limited spring width and lifting force.
2Device complexity
If the protective cover is integrated with the spring mount entirely within the jamb channel, then the structure is simple and integrated, but the curl springs cannot be made wide enough to occupy all available space, limiting counterbalance capacity for heavier sashes
Solution Approach 1:
By separating the cover from the mount, the invention allows the spring assembly to be optimized for maximum width and counterbalance force while the cover provides protection. This segmentation enables heavier sashes to be supported because the springs can occupy the full jamb channel width without being constrained by an internal cover structure.
3Force
If the protective cover is separate from the spring mount, then the curl springs can be wider to increase lifting force, but the installation and assembly process becomes more complex
Solution Approach 1:
The separate cover and mount components can be manufactured independently and then assembled together, which may simplify manufacturing of each individual part while requiring an additional assembly step. The modular design allows for easier replacement and maintenance of either component separately.
Data Source
AI summary
A curl spring mount has a separate cover that can snap fit into the mount to cover and protect the curl springs. A portion of the cover disposed over the vertical space occupied by the curl springs is arranged outside a jamb channel so that the curl springs can occupy the full width of the channel. A shield portion of the cover extends transversely of the jamb channel above the curl springs to protect them from dirt.