Extruded Drive Strip for Vertical Door Breakaway
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Solution Overview
Problem
Existing door systems with retractable panels face complexity and wear issues due to multiple parts and materials, particularly when dealing with various overhead storage configurations and impact scenarios, requiring a simpler and more robust solution that can handle vertical, horizontal, inclined, and coiled tracks without creating loose pieces or causing significant wear.
Innovation Solution
A door system featuring a continuous drive strip with spherical projections and an auto-refeed device, which allows the panel to break away from the track without loose pieces and includes a flexible design to accommodate different storage configurations, using materials like impact-modified nylon and copolymer polypropylene for rigidity and flexibility, and a drive gear with urethane for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complicated collection of numerous parts is used to achieve force-feed and breakaway features, then reliability and safety are improved, but device complexity increases
Solution Approach 1:
The patent combines the drive strip and guide track into a single integrated extruded member, eliminating the need for separate components. The drive strip includes integrated features such as engagement protrusions, retention lips, and guide surfaces all formed as one piece through extrusion, thereby reducing part count while maintaining breakaway functionality and drive capability.
Solution Approach 2:
The extruded drive strip serves multiple functions simultaneously: it guides the curtain panel, provides drive engagement surfaces for the take-up roller, enables breakaway functionality through designed separation points, and maintains tension on the curtain. This multi-functional design eliminates the need for separate guide tracks, drive strips, and retention mechanisms.
2Ease of manufacture
If sheet metal drive strip with sharp edges is used, then manufacturing ease is improved, but harmful factors increase due to wear on the gear
Solution Approach 1:
The patent changes the material parameter from sheet metal to extruded thermoplastic material, and changes the edge geometry parameter from sharp edges to rounded or chamfered edges formed during extrusion. This eliminates the harmful sharp edges that cause gear wear while maintaining ease of manufacture through extrusion processes.
Solution Approach 2:
The drive strip is made from composite or blended thermoplastic materials that provide both the necessary structural strength and smooth surface properties. The extruded material combines rigidity for maintaining shape with surface smoothness to reduce friction and wear on the drive gear, eliminating the harmful effects of sheet metal edges.
3Reliability
If multiple clips are used to attach curtain to drive strip, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the attachment function into the drive strip itself by forming integral retention lips or engagement features directly on the extruded drive strip. The curtain is attached through continuous engagement along the drive strip rather than through discrete clips, eliminating the need for multiple separate attachment components.
Solution Approach 2:
The drive strip uses a flexible extruded profile with integrated retention features that can deform slightly to accommodate the curtain panel while maintaining secure attachment. The flexible nature of the extruded material allows for reliable attachment without requiring rigid clips or complex fastening mechanisms.
Data Source
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AI summary
A vertically operating door and its drive system can be configured to push a door panel along a track to various overhead storage configurations including vertical, horizontal, inclined and coiled. Semi-flexible drive strips extend continuously along lateral edges of the curtain. The system includes a drive gear that engages a series of projections on at least one drive strip so that the gear can push the door between its open and closed positions. To protect the door from being damaged by collisions, the track can include a breakaway feature that allows at least a portion of the panel with its drive strip to separate from the track without permanent distortion. The drive strip and panel remain together as they break away from the track. The threshold of the breakaway force can be changed by selecting a retention strip from a plurality of interchangeable strips having different degrees of flexibility.