Vertical Sag Correction for Roller Shutter Upper Crossmembers
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Solution Overview
Problem
Existing closing installations, particularly those with rolling shutters, face issues with vertical deflection of the upper crosspiece due to horizontal stresses and weight, which impede proper opening and closing of the system, and existing solutions like steel reinforcement are not effective for all types of joinery, especially aluminum and long-length systems.
Innovation Solution
A device comprising a vertical reinforcement immobilized with respect to the carpentry's side uprights, a base to cooperate with the upper crosspiece, and adjustment means to correct vertical deflection by exerting upward traction on the base and upper crosspiece, utilizing a horizontal reinforcement to address vertical deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel tube is engaged inside the upper crosspiece to horizontally reinforce it, then the horizontal strength is improved, but the solution is not compatible with aluminum joinery and only works for short-length PVC joinery
Solution Approach 1:
A steel plate is introduced as an intermediary reinforcement element that can be universally applied to different joinery types (aluminum, PVC, wood) without requiring internal modification of the crosspiece. The steel plate acts as a mediator that provides horizontal strength while being adaptable to various joinery materials and lengths.
2Strength
If a horizontal steel plate is mounted and fixed on the upper crosspiece to reinforce it, then the horizontal strength is improved, but the plate bends vertically under its own weight causing vertical deflection that prevents opening and closing
Solution Approach 1:
The reinforcement system is segmented into multiple vertical supports distributed along the upper crosspiece, rather than using a single continuous horizontal plate. This segmentation reduces the span of each support, preventing vertical bending under self-weight while maintaining overall horizontal strength through the distributed support structure.
Solution Approach 2:
The solution transitions from a two-dimensional horizontal plate to a three-dimensional framework combining vertical supports with horizontal bracing. By adding the vertical dimension with multiple supports, the system eliminates vertical deflection while maintaining horizontal reinforcement.
3Ease of manufacture
If the box is fixed on the upper crosspiece, then the mounting is simplified, but the box does not have sufficient rigidity to remedy deformation caused by horizontal stress
Solution Approach 1:
The box structure is merged with the reinforcement system by integrating vertical supports that are common to both the box mounting and the crosspiece reinforcement. This combination achieves both simple mounting (via the box) and sufficient rigidity (via the integrated vertical supports) without requiring separate complex structures.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a device (6) for correcting the vertical deflection of an upper rail (31) of the window or door frame (3) of a closure system (2), this device (6) comprising: - a horizontally extending vertical reinforcement (7) intended to extend substantially parallel to the upper rail (31) of the window or door frame (3) and to be fixed relative to this frame (3); - at least one base (8) intended to cooperate with the upper rail (31) of the window or door frame (3); - at least one means (9) for adjusting the vertical position of such a base (8) relative to the vertical reinforcement (7). The invention further relates to a roller shutter box (5) comprising such a correction device (6) as well as an installation (1) for closing an opening in a building incorporating such a roller shutter box (5).