HIGH LOAD OPERATION OF INDUSTRIAL ROLL DOOR

摘要

PROBLEM TO BE SOLVED: To provide an industrial door that can reduce the potential for trespassing and unwanted draft, and safely withstand unwanted inwards or outwards bulging of a door curtain in machine protection door installations.SOLUTION: A high load operation industrial roll door includes a flexible door curtain windable about a top roll positioned above a door opening and provided with a drive system. The roll door includes: a bottom beam fastened to the door curtain; and a biasing spring for resisting movement of the door upon application of a load thereon; and a positive stop preventing movement of the biasing means beyond a predetermined point.