Theatre Design & Technology - Fall 2005 - 25
fire safety curtain
Figure 7. Overview of overbalance arbor
system.
Figure 9. Detail of overbalance
counterweight arbors.
Controlling the Descent
Figure 8. Detail of overbalance arbor and
guide system.
descends. With this release system the fire line will travel twice
the distance of the fire safety curtain.
Resetting the overbalance counterweight arbor is not too
complicated. If it was manually released, retrieve the end of
the release line and attach it back to the manual release station. Resetting the release line will raise the upper overbalance arbor to its storage position. It is then possible to raise
the fire safety curtain to its storage position above the
proscenium opening.
24
F
A
L
L
2
0
0
5
TD & T
An inherent problem with letting gravity bring in the fire curtain is the possibility of the curtain falling too fast and bouncing up off the floor, thus not doing its job of keeping smoke
and fire out of the auditorium. Many older overbalance systems
address this problem by tethering the overbalance weight (bar
or arbor) to the grid just short of the full travel of the fire curtain-about three feet above where the curtain is fully closed.
When the overbalance weight reaches the end of its tether, its
weight is removed from the curtain, thereby reducing the
curtain's momentum, and slowing its descent to a bounce-free
stop. That is the way it worked the day it was installed. Over the
years, if the fire curtain has not been used, the cables will often get a permanent set, the grease in the bearings will become
stiffer, and the blocks won't roll as freely as they once did.
When the fire curtain is released, it may stop short of the floor.
Table of Contents for the Digital Edition of Theatre Design & Technology - Fall 2005
Contents
Theatre Design & Technology - Fall 2005 - 1
Theatre Design & Technology - Fall 2005 - 2
Theatre Design & Technology - Fall 2005 - 3
Theatre Design & Technology - Fall 2005 - Contents
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
https://www.nxtbookmedia.com