| STANDARD SPECIFICATION Curtain
The
shutter curtain is constructed from curved section galvanised
steels laths with malleable iron endlocks. The laths are
connected at each end to the heavy-duty drive chain ensuring
smooth running in the side guides. A bottom rail is fitted
to provide complete closure. Shutter Box
Constructed from suitable
mild steel endplates fitted with bearing wheels for roller
and gears with securing angles
for bolting to the floor. The sides of the box are clad with
steel sheets to complete the fire resisting assembly. The
roller barrel onto which the curtain is coiled is mounted
on a central shaft which is retained in bearings and incorporates
a patented constant tension spring mechanism to ensure even
coiling. Side Guides
Fabricated from mild steel
plates designed for fitting to supporting balustrades or
masonry sidewalls. A section of
the guide top plate is removable for maintenance purposes.
Finish
Mainly galvanised with mild steel
parts factory painted with one coat of priming paint. Electrical Operation
The motor drive is designed to suit a 415 volt 3 phase 50
Hz mains supply which has instantaneous automatic changeover
to standby generator (by others) in the case of power failure.
Each shutter is provided with a control panel incorporating
a constant pressure close button, a momentary open button
and an emergency stop button. Controls can be arranged to
receive signals from remote alarm equipment and provide a
timed interface to the main escalator controls. The control
panel is normally mounted onto the shutter box. Emergency
manual operation is by removable crank handle.
Normal operation for night security purposes is by push button
control. In the event of a fire, the shutter is activated
by an incoming signal and following a time delay, moves to
the fully closed position. Safety Features
To prevent closure with
passengers on the escalator, a photocell is fitted which
stops the shutter for a pre-set time delay
after which the shutter continues to the fully closed position.
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