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Construction
Roller
Barrel
A mild
steel tube with bright drawn mild steel support shaft, both
of varying diameter, dependent upon opening size, housing
either helical steel springs to counterbalance the torque
of the shutter curtain, or a 240 volt ac motor for tubular
motor roller shutter doors.
End
Plates
Mild
steel plates to support the roller barrel assembly incorporating
mild steel 'U'
cups, to house the support shaft, secured to continuous
'flag-post' design fixing angles or independently mounted.
Guide
Channels
Roller
mild steel channel selection, of varying depth, dependent
upon opening size, mounted onto mild steel angles to captivate
the shutter curtain on its opening and closing cycle. Doors
subject to high wind loading are fitted with 'windlock'
guide section, and is recommended for doors above 4500mm
wide.
Shutter
Curtain
As
standard, constructed from 76mm deep, concave profile, galvanised
mild steel interlocking laths, with 'end-locks' pressure
riveted at each end of each alternate lath to prevent lateral
movement. The bottom rail is manufactured from galvanised
mild steel inverted 'T' section or 'L' section that interlocks
with the lowest lath to ensure accurate closing at floor
level.
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