Folding Roller Bracket for Sectional Door Headroom
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Solution Overview
Problem
Existing sectional doors face challenges in achieving complete closure of wall openings with limited headroom, efficient use of clearance height, and maintaining long-term operational reliability due to increased wear and tear, particularly when the arc-shaped guide rail segment is situated partly in the clear opening.
Innovation Solution
A sectional door design featuring a separately liftable lower edge of the door body element, which pivots upward relative to the upper door body element, combined with a limiting device to control this movement and prevent uncontrolled pivoting, and pretensioning devices to facilitate smooth operation and secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the arc-shaped guide rail segment is situated entirely in the lintel area to achieve complete closure of the wall opening, then the closure quality is improved, but the headroom requirement increases significantly
Solution Approach 1:
The door body is divided into multiple door body elements (first, second, third elements) that can move independently relative to each other. The lower door body element can pivot separately from the upper elements, allowing the trailing edge to follow a different path than the main door body during opening/closing operations.
Solution Approach 2:
The lower door body element is configured to pivot dynamically during the opening and closing movements. A pivoting lever connected to the trailing edge allows this element to rotate about a pivot axis, enabling the trailing edge to move along a modified path that clears the arc-shaped guide rail segment.
2Area of stationary object
If the lower door body element pivots upward to free up the clear wall opening in the open position, then the clear opening is improved, but uncontrolled pivoting and increased wear occur
Solution Approach 1:
The limiting device acts in advance to prevent harmful uncontrolled pivoting movements. It restricts the pivoting motion to a predetermined safe range, preventing the trailing edge from moving too far upward or sideways, which would cause impact loads and wear on the guide rail segment and other components.
3Reliability
If the trailing door body element lies in the same plane as upper elements in closed position to achieve complete closure, then the closure quality is improved, but the trailing edge protrudes into the clear opening in open position
Solution Approach 1:
The lower door body element pivots dynamically during operation. In the closed position, it lies substantially in the same plane as the upper elements to ensure complete closure. During opening, it pivots upward to clear the arc-shaped guide rail segment, allowing the main door body to be positioned entirely within the building.
4Length of stationary object
If the arc-shaped guide rail segment is placed partly in the clear opening to reduce headroom, then the headroom is reduced, but the closure quality and operational smoothness deteriorate
Solution Approach 1:
The door body is segmented into multiple elements with independent movement capabilities. The lower element can pivot separately to compensate for the suboptimal positioning of the arc-shaped guide rail segment, ensuring that the trailing edge still clears the segment properly even when it extends into the clear opening.
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 effectively frees up the clear wall opening, reduces wear on the door and its components, and ensures trouble-free long-term operation by controlling the pivoting movement of the lower edge and generating the necessary breakaway torque for closing, while maintaining secure closure and minimizing noise.
Implementation Method 1
a first pretensioning device forcing the separately liftable edge of the lower door body element into the predetermined path upon moving from the open position to the closed position
Implementation Method 2
a guide element arranged in the guide rail assembly, wherein the guide element redirects a direction of a traction force acting on the separately liftable edge of the lower door body element
Data Source
AI summary
A door having a door body that can be lifted, along a predetermined path, from a closed position in which it closes a wall opening into an open position in which it is located substantially overhead, the door body having two, three or more door body elements arranged one on top of the other in the closed position, is modified according to the invention in that a lower edge of the door body in the closed position and trailing during the lifting can be lifted separately, when the door reaches the open position, by a pivoting movement of a lower door body element having said edge in a lifting direction with respect to a door body element situated above it in the closed position relative to the predetermined path.