I want to know what regulation cover a device to up or down a load ,no persons.

Stroke 6 meter.

Load 2000 Kg.

Speed , slow , does not matter, it will be used once a month.

No rigid rails guide. Nothing to be see after any movement done.

Fixed in a building roof.

To to rise and down a car from a roof, to the 3rd level floor in a mall shopping, to be show by the car dealer.

To work with no public arround, nigth hour

I think in a 4 leg gantry , a plataform , 4 wire or cable each corner, wind in 4 drums, 2 shaft , driven by ASA link chain , from a gear box.

The plataform will close the hole in the roof , when not in use.

Machines over the gantry.

Actuated by electric motor + gear box, with normally applied brake when no power is apply.

Main concern , how to make a safety device

No way to locate a bumper at the floor.

I clear fact , a fixed crane.