Electric Door and Gate Operators

Trolley type-ceilling, Wall Mounts, B1-Parting, Sliding Doors Electric Operators

Trolley Type-Ceillling and Jack-Shaft-Wall Mount

Trolley Type-Ceillling and Jack-Shaft-Wall Mount

Sliding Gate
Electric Operators

Swing Gate
Electric Operators

Trafic control barriers
To control of vehicular traffic in private and public parking areas.

Rolling &Fire Doors
Rolling Service Doors & Fire Doors. Jack Shaft - Wall Mount

Different accessories for your needs

Safety Devices
Reverse Systems and Sensor

Entry-Exit Devices
Loop Detectors, Card Reader and more

Operating Controls


Special applications


GH Worm Gear electric door operators, heavy duty industrial type, are designed and engineered primarily to operate rolling curtain doors, multiplex doors, multi-leaf doors, multi-blade doors, vertical lift doors, etc. Naturally many other types of doors can be equipped with this operator providing the door has a shaft as the basic driving element.

Worm gear reducer, single stage, running in an oil bath, 40:1 ratio, C flange design, alloy cast iron housing. No. 50 roller chain and sprockets from operator shaft to door shaft. Door speed: 7" (18cm) per second approx.

Adjustable Automatic Friction Clutch:
Will protect door and operator in case of obstruction (optional at extra cost).

Limit Switches:
Rotary type with oilite bronze cams and precision micro switches for automatic stopping of door in up and down positions (easily adjustable without tools).

Reversing Contactor:
Heavy duty type.

Three Button Control:
Momentary contact type for up, down, stop. Operator may be stopped in any position and door moved up or down from that position. Down button can be wired for constant pressure when specified. Control circuit 24V AC for users protection.

Chain Hoist:
Equipped with a disconnect device which allows a person to disengage the operator from the door and operate the chain hoist from the floor by hand in the event of power failure without having to remove the drive roller chain. Limit switches will not go out of adjustment when hoist is used.

Safety Interlock:
Electrical interlock switch automatically cuts power of operator control when chain hoist is in operation.

Solenoid Disc Brake:
To prevent door from coasting and secure locking of door in closed position.

Left and right hand (must be specified). Right hand shown.

Manual Overload Relay:
For overcurrent and under voltage protection (can be reset manually).

3/4 HP (559.5W), 1 HP (746W), 1-1/2 HP (1119W) or 2 HP (1492W), 120V or 240V single phase, 208V, 230V, 416V, 460V or 600V three phase. 2 HP (1492W) not recommended on single phase motors.

Sideroom Required:
20" (50cm) minimum.

Primed with rust-proof primer and spray painted in blue hammertone enamel.


Three Button Control:
Momentary contact type for open, close, stop. Fully guarded. 600V AC maximum. Screw type terminal.

Motor Control:
Heavy duty reversing contactor, two sets of three pole contactors on a common frame, mechanically interlocked to prevent simultaneous closure, clapper-type armature with three point suspension, auxiliary contacts SPDT or DPDT (as required) on each armature, coils 24V AC. Load contact amps resistive @ 120V AC 15 amps, @ 240V AC 10 amps, @ 600 V AC 5 amps. Terminals .250" (.625cm) quick connect; mechanical life 10 million cycles.

Worm gear reducer, single stage, running in an oil bath with 40:1 ratio, C flange design, alloy cast iron housing. Hardened and ground steel worm and alloy bronze gear for greater wear life. High speed taper roller bearings, double lip spring loaded seals to keep lubricant in and dirt out. Alloy steel shafting hardened and ground for greater strength. Input RPM1750, maximum 2 HP (1492W), output torque 1380in/lbs; overhung load 1100 lbs., output shaft: 1" D. speed 44 RPM, door speed 7" (18cm) per second approx.

Unit Chassis:
Heavy steel channel frame assembly reinforced with steel gusset plates, bolted together for greater strength.

Limit Switches:
Rotary type, friction free, oilite bronze cams, grooved and lock guided in a spring loaded formed galvanised steel plate. Cams are fitted on 5/8" x 10-3/4" (2.05cm x 26.88cm) C.R. steel shaft, rotating on lubricated high speed ballbearings. Cams on their preset travel, activate micro switches to cut power of motor control in both open and close directions of door. Operating force on limit switches 4 oz. (113.4g) maximum, contact separation .020" (.05cm). Terminations .250" (.625cm) quick connect.

Manual Overload Relay:
Protects operator from overcurrent and under voltage. Can be reset manually.

Electrical Control Cabinet:
Factory pre-wired, made from 14 ga. H.P. steel, pre-formed EEMAC I enclosure size 8" x 16" x 5" (20cm x 41cm x 13cm) with removable cover for easy service and maintenance, mounted on unit chassis with four zinc plated steel bolts.

35VA step-down transformer:
  • 120V AC primary to 24V AC secondary.
  • 240V AC primary to 24V AC secondary.
  • 208V, 230V, 416V, 460V, 600V AC primary to 24V AC secondary.
Adjustable Friction Clutch:
4" (10cm) diameter aluminium disc attached to output reducer shaft covered one side with 4" x 1/8" (10cm x .31cm) non-flammable clutch fibre material, compressed with a 50B23 sprocket by means of heavy compression spring and lockable nut. Holding force up to 200 lbs. Friction clutch system can be adjusted as easily as required depending on door size and weight. Friction clutch will protect door and operator in case of obstruction. Limit switches will not go out of adjustment when friction clutch is actuated. (Optional at extra cost).

Emergency Chain Hoist:
Combined with a floor operated disconnect which when pulled will disconnect the electrically driven solenoid brake and engage the chain hoist for manual operation in the event of power failure, without having to remove the main drive chain. Assembly consists of one grooved aluminium pocket wheel, lever arm, one coupling, 1/8" (.31cm) D. pull cable, 7/16" (11.1mm) D. bright polish chain, wall chain keeper and disconnect arm.

Safety Electrical Interlock:
When chain hoist is in operation a normally "ON" toggle switch cuts the power line of operator control automatically. This safety electrical interlock will protect operator and door when power is restored and push button station is pressed accidentally.

Rated for continuous duty (capacitor starting on single phase models) 3/4 H.P. (559.5W), 1 H.P. (746W), 1-1/2 H.P. (1119W) or 2 H.P. (1492W), 120V or 240V single phase, 208V, 230V, 416V, 460V or 600V three phase, 1725 RPM, ballbearings permanently lubricated, frame rigid type 56C, shaft 5/8" (2.05cm) or 7/8" (2.22cm) diameter. 2 H.P. (1492W) not recommended for single phase.

Unit is factory pre-wired, colour coded and tagged.
Wiring diagrams are enclosed with each operator.
Operator is pre-run and tested before shipment.