| STANDARD SPECIFICATION Curtain
The
shutter curtains are constructed from continuously interlocking
galvanised steel laths securely held in place by endlocks.
Shutters up to 3 metres wide are normally supplied with 51
x 0.9mm thick flat-faced laths with larger shutters being
constructed from heavier duty 76mm curved laths in thicknesses
of 0.9 or 1.2mm dependant upon size.
Bottom Rail
On flat-lath shutters, the
bottom rail is formed from a reinforced lath to give uniformity
of appearance. Larger
curved-lath shutters employ double angles to form an inverted "tee" section.
Both types are fitted with a stainless steel nameplate stating
the relevant approval body and other details.
Guides
Vertical guides are fabricated from cold rolled galvanised
steel channels 52 or 79mm deep with continuous steel angles,
which are pre-punched to ensure fixing to the bulkhead at
the correct centres.
Roller
The roller is made from seamless steel tube of adequate
diameter and wall thickness to avoid deflection and its solid
steel shaft is supported in bearings mounted on each endplate.
Endplates
Fabricated from steel plate and prepared to accept the coil
casing. Securely bolted to steel angles which are drilled
for attachment to the bulkhead at the correct centres.
Coil Casing
Constructed from galvanised steel and attached to the structure
by M8 setscrews.
OPERATION
Manual operation
Manual push-up operation is via lifting handles on the bottom
rail. Self-closing in a fire condition is achieved by the
activation of either a fusible link or the interruption of
a continuous fire signal to a 24 or 220 volt DC magnet. Larger
shutters are fitted with a speed governor to control the
descent.
Electrical operation
The shutter is driven by a single or three phase geared
Speedsafe motor which incorporates an electro-magnetic brake,
adjustable limit switches and a push button station. The
design provides a fail-safe system which will close the shutter
automatically in the event of a fire without the need for
mains power and a controlled descent is assured whether closing
electrically or by gravity. Activation in a fire situation
is as the manually operated version.
Manual operation in the event
of power failure is achieved by releasing a pull cord to
close the shutter with a controlled
descent and a hand chain to re-open.
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