RAL colours

This refers to the standardised colour table of RAL GmbH. A four-digit number is assigned to each individual colour. The use of this system has become established as a standard reference for paintwork, as it considerably simplifies the coordination between customer and supplier.
he RAL Classic system currently has a total of 213 colours.

Ramp plate

Ramp plates are used with lift tables or column lifts to compensate for a difference in height between the platform and the surrounding floor. This allows the lift table or column lift to be loaded with a pallet truck even if no pit or special platform geometry is to be used.


When hydraulic lift tables are loaded or unloaded when they are in the raised position, a minimal movement of the platform can be detected. This is due to the compression of the hydraulic oil.
When the lift table is unloaded in the raised position, the pressure inside the cylinders is reduced. As a result, the hydraulic oil is less compressed and the platform lifts slightly. This process is called rebounding.
The length of the spring deflection depends on various factors (lever arms, dead weight of the lift table, weight of the load). If necessary, the platform can be prevented from compression and rebound by appropriate additional equipment.


Faulty production of processes is referred to as rejects.
Depending on the severity of the defect, the corresponding components are disposed of, reworked or used for other purposes.


A relay can also be called an electrically actuated switch. Relays are mostly used for two reasons:

1. When galvanic isolation of two circuits is required, such as when a potential-free contact is transferred.
2. To separate the control circuit from the power circuit.

To trigger a switching operation, the control circuit energises the relay's operating coil. The energised coil now creates a magnetic field which switches the contacts of the relay. A voltage drop across the coil causes the switching contacts to return to their initial position.


A roll-stop secures the load against rolling off and so protects bystanders against injury and the load against possible damage.
Roll-stops on the lift table can be extended manually or automatically. Manual roll-stops are often designed to be insertable, e.g. as simple railings. Automatic roll-stops are usually extended by means of a lever mechanism or a hydraulic cylinder. They ensure that the roll-stop always extends when the platform of the scissor lift table is raised.
Square tubing, which extend when the platform is raised, have proven to be a simple and effective roll-stops.

Rotor (electric motor)

The rotating part of an electric motor is referred to as the rotor or armature. The fixed winding is called the stator.