Gym Divider Curtain Product

Overview

A gymnasium divider curtain is a motorized partition system that allows a single large sports facility to be divided into multiple independent activity zones. A school gymnasium with a 60 × 40 meter court might deploy a divider to create two 30 × 40 meter sections for simultaneous volleyball and badminton matches, or a 30 × 20 meter section for training while the remaining space hosts league play.

Unlike movable wall panels, which are labor-intensive and noisy, an electric divider curtain retracts into a compact roll mounted near the ceiling. The fabric is Class A fire-rated (NFPA 701 standard), meeting building codes for indoor public spaces. Safety sensors and a pressure-sensitive bottom edge prevent injuries during operation.

How it works

Motorized Rolling Mechanism

A [[blower-motor|2 HP electric motor]] powers a [[gym-divider-curtain-gearbox|20:1 reduction gearbox]] that rotates the [[gym-divider-curtain-tube-mandrel|aluminum roll tube]] at approximately 18 RPM. The [[gym-divider-curtain-chain-drive|roller chain drive]] transmits torque from the motor to the mandrel. Two [[gym-divider-curtain-bearing-block|pillow block bearings]] support the mandrel at each end, allowing smooth, balanced rotation.

The [[gym-divider-curtain-fabric-panel|fire-rated fabric]] is pre-sewn with hemmed edges and [[gym-divider-curtain-grommet|brass grommets]] every 200 mm along the top edge. As the mandrel rotates, the fabric winds onto the mandrel in a tightly controlled spiral, eliminating wrinkles and bunching. The gearbox includes a [[gym-divider-curtain-gearbox|slip-clutch mechanism]] rated at 250 Nm; if the fabric jams (e.g., caught in a structural obstacle), the clutch slips, protecting the motor and transmission from overload damage.

Safety Sensors and Emergency Stop

Deployment and retraction are controlled by [[gym-divider-curtain-control-unit|speed and limit switches]]. Three [[gym-divider-curtain-proximity-sensor|inductive proximity sensors]] mounted on the mounting frame detect the leading edge of the rolled fabric:

• When fully retracted, a sensor triggers and prevents the motor from continuing to wind (preventing over-tension).
• When fully deployed, a second sensor stops unwinding.
• A third sensor serves as redundant confirmation of safe position.

Additionally, a [[gym-divider-curtain-soft-edge|pressure-sensitive safety edge]] foam strip is mounted along the bottom edge of the curtain. If the descending curtain contacts a person or object, the soft edge triggers a normally-closed switch that immediately de-energizes the motor. This dual-layer safety (sensor-based position limits + contact-based emergency stop) complies with EN 12453 automatic door/curtain safety standards.

Curtain Path and Alignment

The [[gym-divider-curtain-mounting-frame|top rail]] is an aluminum T-channel bolted to the gymnasium ceiling structure. Two [[gym-divider-curtain-side-rail|vertical guide rails]] (full ceiling height) are mounted on each side of the gymnasium span. As the fabric descends, it passes between the side rails, which prevent the curtain from billow or lateral sway due to air currents (HVAC systems, open doors). The [[gym-divider-curtain-side-guide-channel|steel U-channel guides]] contain [[gym-divider-curtain-roller-wheel|nylon V-groove rollers]] that minimize friction and allow smooth sliding even with a 120 kg suspended load.

At the bottom, a [[gym-divider-curtain-weight-bar|weighted hem bar]] (steel channel filled with lead shot, 25 kg per meter) hangs freely below the bottom edge. This weight maintains vertical tension on the fabric, preventing flutter and ensuring that the curtain sits flush against the gymnasium floor during deployment.

Proportional Speed Control

The Control Unit houses a [[gym-divider-curtain-potentiometer|manual speed dial (10 kΩ potentiometer)]] that allows the operator to adjust deployment or retraction speed from 0 to 100%. A microcontroller reads the potentiometer and modulates the motor contactor using pulse-width modulation (PWM) to control motor voltage and speed. This proportional control prevents sudden jerking motions that could strain the mechanism or startle people in the gymnasium.

Typical operation: Press "Deploy" and adjust the dial to 50% speed; the fabric unwinds at approximately 2 meters per minute, allowing the operator to stop and fine-tune positioning. Once fully deployed, the proximity sensor triggers and the motor automatically halts.

Installation Considerations

Installation requires attachment of the top rail and ceiling brackets to the gymnasium structural frame. For a 6-meter gymnasium with wooden joists, fastening uses 1/2-inch lag bolts every 1.2 meters. For steel truss, welded brackets or bolted clips are used. Side guide rails must be plumb (vertical) to within 10 mm per 3 meters to ensure smooth curtain travel; installation crews use a laser level for verification.

The motor and gearbox are bolted to a wall-mounted pedestal or hung from the ceiling on a separate bracket system that does not impose load on the roll tube itself. This isolates vibration and allows servicing without disturbing the structural curtain installation.

Electrical supply requires a dedicated 20 A single-phase 208/240 VAC circuit with overload protection and an accessible e-stop button. The soft-edge safety circuit is independent, hard-wired through safety relays that do not depend on software logic.

Annual maintenance includes fabric inspection for tears or water damage, bearing lubrication, and testing of all safety switches. The fabric itself is washable and may be treated with mild detergent and water; no organic solvents are used as they degrade fire-retardant coatings.