Roller Shutters and Roller Shutter Doors
The curtains consists of interlocking SC4 or SF4 slat cold rolled formed from galvanized steel. The steel slats are to be galvanized as per A.S.T.M. A653. Each curtain shall receive a bottom bar to maintain slat alignment and posture. The bottom bar shall consist of an interlocking slat carriage bolted to a 2 inches x 2 inches x 1/8 inch hot rolled angle. The lifting handle is centered.
The spring counterbalance is computer designed. Using USP Helical Power Pack springs. The housings rotate around a fixed pipe shaft using steel cup bearings. The guides are rolled and formed from 11 gauge steel into a 2 1/2 inches deep channel with 3/8 inch returns. The guide is field welded to a mounting angle, minimum 2 inches x 2 inches x 1/8 inch hot rolled. The hoods shall consist of #24 U.S. gauge steel. The hoods are designed to protect and house counterbalance assembly. The end bracket plates shall be of a sufficient gauge to minimize deflection. Each plate has welded angle pipe support to accept spring shaft assembly.
The locking uses “HASPS & PINS,” a galvanized steel pin padlocked to a steel hasp welded to the track. For other locking mechanisms see “LOCKS”. The finished all exposed non-galvanized surfaces shall receive a shop coat of rust inhibiting primer. The field painting is not included in this section. Installation is to be by USP or by an authorized dealer.