System for stabilizing the top lamella against wind load by using a linear chain

In a vertical running door system comprising lamellae, a shaft driven in rotation, and a take-up means, a stabilizing system is provided, the stabilizing system comprising:

• an elongate bracket affixed to a topmost lamella of a door, the elongate bracket being elongate in a vertical direction of the door and extending above an uppermost edge of the topmost lamella when the door is in an unwound position;
• an elongate chain link pivotally attached to form a first joint at a first end of the elongate chain link to a portion of the elongate bracket;
• an elongate middle chain link pivotally attached to form a second joint at a first end of the elongate middle chain link to a second end of the elongate chain link;
• an elongate swivel arm pivotally attached to form a third joint at a first end of the elongate swivel arm to a second end of the middle chain link and a second end of the elongate swivel arm pivotally attached to a clamp
• wherein, in response to a force transverse to the vertical direction of the door, the bracket restricts rotation of the elongate chain link in a first direction about the first joint and the middle chain link restricts rotation of the elongate chain link in a second direction about the second joint to stabilize cooperatively the topmost lamella from transverse deflection.