Steel Rolling Doors-CG300
The pre-engineered curtain roller is made from one or more heavy gauge steel pipes suitably flanged to form a continuos barrel strong enough to support the curtain with an ample factor of safety. A low-stress torsion spring counterbalance of proper capacity to balance the curtain in all positions is built into the roller. Main bearings for the curtain roller are flange-type heavy duty ball bearings that make operation smooth and friction-free. These bearings are lifetime lubricated and sealed. The curtain hangers have an involute shape that allows the curtain to wind smoothly without lumping or distortion. When hand chain or power operators are used the drive end of the curtain roller is coupled to the operator by means of a sprocket and roller chain drive - hand crank operators are usually direct coupled.