Roll-up Door Wind Lock with Compound Bevel
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Solution Overview
Problem
Overhead roll-up door assemblies face issues with wind loads and transverse forces, leading to increased friction, potential damage, and disengagement of door panels from side columns, which existing wind locks fail to adequately address, especially with continuous 45-degree bevels causing wedging and excessive wear.
Innovation Solution
The introduction of a wind lock configuration with 90-degree faces and a compound beveled edge at the bottom, combined with a resilient side column cover, allows for reduced friction and easy disengagement from side columns under wind loads while maintaining impact resistance by using a 60-degree bevel and 30-degree angle to facilitate escape without damaging components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a continuous 45-degree bevel is used on the wind lock, then the door panel can disengage under impact, but friction increases significantly causing wear and potential binding
Solution Approach 1:
The wind lock is divided into distinct functional segments: a primary 90-degree face for low-friction operation and a secondary 45-degree bevel at the bottom for impact disengagement. This segmentation allows each portion to perform its specific function without the harmful effects of a continuous bevel configuration.
Solution Approach 2:
Different portions of the wind lock are given different geometric properties: the main body features a 90-degree face for minimal friction during normal operation, while the bottom edge incorporates a 45-degree bevel for impact disengagement. This local differentiation optimizes both friction reduction and impact response.
2Reliability
If a thick rubber strip is used as a wind lock, then the door panel remains engaged under wind load, but friction increases and the motor requires more power
Solution Approach 1:
The wind lock geometry is changed from a continuous beveled shape to a configuration with a 90-degree face and bottom bevel. This parameter change reduces the friction coefficient during normal operation, allowing the motor to use less power while maintaining reliable engagement under wind load through the 90-degree face configuration.
3Ease of operation
If the door panel is made flexible to allow movement, then it can open and close smoothly, but it may disengage under high wind loads or impact
Solution Approach 1:
The 90-degree face on the wind lock provides a preliminary counter-action to wind loads and impact forces, preventing disengagement before it occurs. The geometry is designed to resist outward forces that would cause the flexible panel to disengage, while still allowing smooth vertical movement during normal operation.
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 configuration significantly reduces frictional forces, enhances wind load response, and enables safe disengagement from side columns during impacts, minimizing wear and stress on the door assembly and motor, while maintaining operational integrity.
Implementation Method 1
The combination of the complementary angled faces on the wind lock and side column may also act to move or flex or rotate a portion of the side column to expand the gap in the side column to more easily allow the wind lock and door panel to escape
Implementation Method 2
it is also common for the industry to overlap a thick rubber or similar wind lock with a low-friction fabric polyethylene terephthalate (PET) material
Data Source
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AI summary
A wind lock for an overhead roll-up door, the wind lock having a first edge which is substantially straight and capable of extending substantially perpendicular vertically from a face of a door panel to which the wind lock attaches to, the wind lock including a second edge having an angled-beveled face, wherein the second edge extends at an angle from the first edge laterally across the face of an attached door panel is beveled with the face of the door panel so as to extend vertically from the face at an angle.