Freight Elevators

The Atlantic Freight Elevator is a holeless design with side mounted hydraulic cylinder(s). The Model SFE has a single cantilevered holeless hydraulic system and Model DFE has a double rail dual holeless hydraulic system.

Unlike conventional hydraulic systems, this design does not seep oil, making it one of the most environmentally friendly systems available.

Freight Elevators are governed by CAN/CSA B44 S2/B44 00//ASME 17.1-2000. Freight Elevators are allowed a vertical travel limited only by the capacity of the hydraulics.

The power unit and controller are located in a machine room that is adjacent to the hoistway.

Structure
The car is a welded structural steel assembly with a non-skid checker plate surface ("Slip-Not" flooring is available as an option). The wall panels are constructed of sheet metal on a structural tube frame and are a minimum of 2 metres high. The car assembly is guided by high tensile "I" beam vertical guide rails by means of four inch, high speed, sealed bearings attached to the top and bottom of the car. This design provides for the highest stability and least distortion available in the industry today, providing a safe and durable system for both front and side loading. Safety maintenance pins are provided that when put in place, will safely support the car during maintenance or service. Atlantic's in-house welding shop and field service team are CWB approved to CSA W47.1.1992 and W59.

Hydraulic System
The pumping unit is comprised of a direct coupled motor and fully submerged pump, oil reservoir, suction and filler strainers, solenoid operated lowering valve, pressure gauge with isolating valve, pressure relief valve, manual shut-off valve, pressure compensated flow control valve and a manual lowering by-pass valve to allow lowering of the platform in the event of a power failure. Our fully adjustable hydraulic control valve provides for soft starts and stops in both directions.

This leak proof system is above ground and does not endanger surrounding soil with contamination. The hydraulic cylinder(s) is a single action, single speed, piston seal or displacement type with seamless tube, micro-honed cylinder walls and chrome finish piston rods. The cylinder(s) is equipped with a safety velocity fuse at the pressure port to stop downward motion of the platform in the event of a hydraulic supply line failure.

Synchronized telescopic cylinder(s) are available for low overhead applications.

The Electrical Control System
The control panel is comprised of two main line contactors in line with thermal overload motor protection, a transformer to reduce the primary control voltage to 120 volts for operator safety and a fused secondary circuit of industrial relays.

The floor selection push button controls are of the momentary contact (SAPB) type that will raise or lower the car until the selected floor is reached. The controls and equipment may be protected against unauthorized use by keyed switches.
An anti-creep levelling device is provided to maintain floor level.

No controls except the emergency stop will over-ride a control device in operation. Controls on the car have priority and render the hall station inoperative once a floor button is selected, and, for a timed period to allow personnel to exit the car. Other than the anti-creep levelling device, all controls are switched off when any door is open. The doors are mechanically locked when the car is not at the landings.

The failure of any single magnetically operated switch, contactor, or relay to release in the intended manner shall not prevent the car from stopping in response to terminal stopping devices.

A pit switch is provided that when activated removes power from the system for safety during service and maintenance.