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Inertia Dynamics SO Series Clutch Couplings for Elevator Smoke Curtains
A leading U.S. smoke and fire curtain manufacturer, needed a small, reliable electric
clutch solution for use on its elevator smoke curtains. The roll-up transparent screens are
connected to a smoke detector near the elevators. When smoke (or a power outage) is
detected, the curtains are automatically deployed from recessed system housings located
above the front of the elevator doors. The curtains roll down to completely cover the
entire elevator door opening from top to bottom. The side edges of the curtains feature
flexible magnetic strips that adhere to the metal elevator frame, creating a tight seal.
Inertia Dynamics (IDI) supplied modified Model SO clutch couplings to meet the
customer’s small footprint application requirements. The power-on clutch couplings
provide 50 lb.in. of static torque and are mounted on the driven shaft between a small
gear motor and a cable pulley. When the curtain is deployed, the clutch allows the curtain
to freely roll down to the floor. Rewind switches are located on both sides of the screen.
When one of the switches is activated, the clutch engages the cable drive pulley to roll
the curtain back up into the ceiling housing.
Series SO bearing-mounted clutch couplings are specifically designed for in-line shaft
applications. These stationary field clutches feature precision-centered sleeve and ball
bearings, a zero-backlash armature assembly.
Highlights
- Modified SO Series
stationary field clutches
- Power-on function
- Compact footprint
- Zero backlash
- Supplied models provide
50 lb.in. of torque
- 9 sizes available, from
.90 in. to 4.2 in. diameter